JP2008146576A - Stabilized power supply circuit and portable terminal - Google Patents

Abstract

A stabilized power supply circuit capable of stable and quick start-up operation and capable of responding to the occurrence of an abnormality is provided.
A plurality of control elements connected in parallel with each other to an output terminal 16 are provided in a current control unit 3 and one control output from a control voltage generation unit 2 with respect to a control input of the plurality of control elements is provided. Give the voltage in common. Alternatively, the current control unit 3 is provided with a first control element and a second control element connected in parallel with each other with respect to the output terminal 16, and the control voltage output from the control voltage generation unit is set to the first control element. And an abnormal voltage detector that detects an abnormal voltage based on a voltage that is applied to at least one of the second control elements and appears at the output terminal and a reference voltage that is output from the reference voltage source, and based on the detected abnormal voltage. And an abnormal voltage control unit for controlling the driving ability of at least one of the first control element and the second control element.
[Selection] Figure 1

Description

  The present invention relates to a stabilized power supply circuit that requires a stable and quick rising operation.

  In recent years, particularly in mobile phones, excessive current flows due to a short circuit of the output terminal of the power source, and heat generation of the terminal body due to this causes a problem. Electronic devices, in particular mobile phone terminals, have become more multifunctional, the number of internal power supplies has increased with the addition of functions, and control of each power supply has become complicated. In addition, since individual power supplies are frequently turned on and off frequently in order to save power, it is required to start up individual power supplies stably and quickly. Similarly, when power is turned on, stable and quick start-up of individual power supplies is required. Under such circumstances, there is a need for a function that can detect abnormal operations such as overcurrent, output voltage abnormality, and temperature abnormality, and a stabilized power source that can perform a more stable and quick startup operation.

  As a measure against overcurrent, it is common to insert a fuse in the output stage of the stabilized power supply. 28 to 30 show a conventional stabilized power source using a fuse.

  The conventional example shown in FIG. 28 shows a stabilized power supply having a general configuration. In the stabilized power supply shown in FIG. 28, the voltage output from the reference power supply 1 and the voltage detected by the output voltage detection resistor 5 (voltage obtained by dividing the output voltage) are input to the operational amplifier 2 and those are output. A voltage corresponding to the differential voltage is output from the operational amplifier 2 and input to the gate terminal of an FET (field effect transistor) 3. Then, a certain stable DC voltage is supplied from the power supply 4 via the FET 3. A fuse 17 is provided in an output stage for supplying power, and the output terminal 16 is connected to an arbitrary load as a power supply destination. The fuse 17 is blown when a current of a certain value or more flows for a certain time or more, and the fuse 17 is blown to protect against overcurrent.

  The conventional example shown in FIG. 29 shows a general step-down DC / DC converter. In the step-down DC / DC converter shown in FIG. 29, the voltage output from the reference power supply 1 and the voltage detected by the output voltage detection resistor 5 (voltage obtained by dividing the output voltage) are input to the operational amplifier 2. A voltage corresponding to the difference voltage between them is output from the operational amplifier 2 and input to the drive circuit 14. The drive circuit 14 outputs a pulse signal to turn on / off the FET 3. When the FET 3 is ON, power is supplied from the power source 4 via the FET 3 and the inductor 12. Further, when the FET 3 is OFF, power is supplied to the output via the rectifying diode 15 and the inductor 12. The voltage waveform generated by turning on / off the FET 3 is smoothed by the capacitor 13 and supplies a certain stable voltage. A fuse 17 is provided in the output stage that supplies power, and the output 16 is connected to a load that is a power supply destination. The fuse 17 is blown when a current of a certain value or more flows for a certain time or more, and the fuse 17 is blown to protect against overcurrent.

  The conventional example shown in FIG. 30 shows a general step-up DC / DC converter. In the step-up DC / DC converter shown in FIG. 30, the voltage output from the reference power supply 1 and the voltage detected by the output voltage detection resistor 5 (voltage obtained by dividing the output voltage) are input to the operational amplifier 2. A voltage corresponding to the difference voltage between them is output from the operational amplifier 2 and input to the drive circuit 14. The drive circuit 14 outputs a pulse signal to turn on / off the FET 3. When the FET 3 is ON, it is grounded from the power source 4 to the GND via the inductor 12, and energy is stored in the inductor 12. At this time, power is supplied from the capacitor 13 to the output. Further, when the FET 3 is OFF, the energy accumulated in the inductor 12 is released, and power is supplied from the power source 4 and the inductor 12 to the output via the rectifying diode 15. The voltage waveform generated by turning on / off the FET 3 is smoothed by the capacitor 13 and supplies a certain stable voltage. A fuse 17 is provided in the output stage that supplies power, and the output 16 is connected to a load that is a power supply destination. The fuse 17 is blown when a current of a certain value or more flows for a certain time or more, and the fuse 17 is blown to protect against overcurrent.

  By the way, other than a method using a fuse, a countermeasure for overcurrent has been known. For example, there is one provided with an overcurrent protection circuit that stops the current when a current of a predetermined value or more is detected at the output stage of the stabilized power supply.

Moreover, in the prior art disclosed in Patent Document 1, a current detection unit including an overcurrent protection circuit that stops current when a current of a predetermined value or more is detected, and an object to be fed via the current detection unit And a control unit that feeds power to. Then, when the control unit starts supplying power, the operation of the overcurrent protection circuit of the current detection unit is stopped until the voltage of the power supply object is stabilized, so that the electronic device It has been proposed to prevent malfunctions.
Japanese Patent Laid-Open No. 10-243544

  However, the countermeasure against overcurrent by inserting the fuse 17 such as the stabilized power source shown in FIG. 28, FIG. 29, and FIG. It was. Therefore, once an overcurrent is detected and the fuse 17 is blown, the subsequent operation is impossible unless the fuse 17 is replaced. Further, when the power supply is turned on, the fuse 17 may be blown by an inrush current generated when the output capacitor 13 is charged, and the start-up operation may not be performed stably and reliably. It was.

  In addition, a stabilized power supply equipped with an overcurrent protection circuit that stops the current when a current exceeding a predetermined value is detected in the output stage, detects the overcurrent due to the inrush current that occurs when the power supply is turned on and turns it off / on. The start-up operation is performed while repeating the / off / on operation, and it takes time until the output voltage is stabilized.

  Moreover, as shown in Patent Document 1, a current detection unit is provided in the output line of the power source, and the detection unit is provided with an overcurrent protection circuit, and when the power supply is started, the voltage of the power supply object is stabilized. By stopping the operation of the overcurrent protection circuit of the current detection unit, the stabilized power supply having a function of preventing malfunction of the electronic device during power feeding has no function of preventing inrush current. For this reason, a large voltage drop occurs in the circuit due to the inrush current, the output voltage of the power supply is abnormally lowered, and resetting is performed, and the operation of the device may be stopped.

  The present invention has been made in order to solve the above-described conventional problems. A stabilized power supply circuit that can perform a stable and quick start-up operation and can cope with the occurrence of an abnormality, and a mobile phone including the stabilized power supply circuit. The purpose is to provide a terminal.

  The stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detection unit that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and a power source that supplies DC power. A current control unit connected to the output terminal; and a control voltage input to the current control unit according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. And a control voltage generation unit for providing to the current control unit a plurality of control elements connected in parallel to the output terminal, and each of the plurality of control elements One control voltage output from the control voltage generator is commonly applied to the control input.

  With this configuration, a plurality of control elements connected in parallel to the current control unit is provided, so that the current flowing from the output terminal to the load passes through the plurality of paths from the power source through the respective control elements. Will be supplied. Therefore, for example, in a situation where the output terminal is short-circuited, even if an overcurrent flows, the current flows in a distributed manner to a plurality of control elements, so that the heat generation of each control element can be suppressed.

  Further, if an FET (field effect transistor) is employed as the control element, the maximum value of the current flowing through each control element can be automatically suppressed. Therefore, each control element does not repeat the on / off operation with respect to the inrush current that occurs when the power supply rises, and the output voltage can be quickly raised while the current is limited to the maximum value.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected between a source and the output terminal, and a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control voltage generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the output terminal. And a control voltage output from the control voltage generator is applied to at least one of the first control element and the second control element so that a voltage appearing at the output terminal and a reference voltage output from the reference voltage source are provided. Abnormal voltage based on An abnormal voltage detection unit that outputs, and an abnormal voltage control unit that controls at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit. It is characterized by that.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the abnormal voltage control unit controls the drive capability of at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit (set to an off state or half For example, when the output terminal is short-circuited, an abnormal voltage is detected, and the first control element or the second control element suppresses an abnormal (excessive) output current. To do. Also, at the time of start-up, until the output voltage stabilizes, the drive capability of the first control element or the second control element is controlled to suppress the inrush current or control the time required for the start-up. It becomes possible to do. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In the stabilized power supply circuit of the present invention, the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other, or one resistance voltage dividing circuit having a plurality of outputs. It is characterized by that.

  With this configuration, since a resistance voltage dividing circuit is used, a level proportional to the voltage appearing at the output terminal can be detected.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected between a source and the output terminal, and a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control voltage generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the output terminal. A current detection unit configured to apply a control voltage output from the control voltage generation unit to at least one of the first control element and the second control element, and output a signal proportional to the magnitude of the current flowing through the output terminal; And the current detection An abnormal current detection unit that detects an abnormal current based on a current signal output from the reference unit and a reference voltage output from the reference voltage source, and the first control based on the abnormal current detected by the abnormal current detection unit. An abnormal current control unit that controls the drive capability of at least one of the element and the second control element is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the abnormal current control unit controls the driving ability of at least one of the first control element and the second control element based on the abnormal current detected by the abnormal current detection unit (set to an OFF state or half For example, in a situation where the output terminal is short-circuited, an excessive current is detected, and the first control element or the second control element suppresses an abnormal (excessive) output current. To do. Also, at the time of start-up, while a large current is flowing due to the inrush current, the drive capability of the first control element or the second control element is controlled to suppress the inrush current or to require the rise. It becomes possible to control the time. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected between a source and the output terminal, and a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control voltage generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the output terminal. And a control voltage output from the control voltage generator is applied to at least one of the first control element and the second control element so that a voltage appearing at the output terminal and a reference voltage output from the reference voltage source are provided. Based on the output A temperature abnormality detection unit for detecting a temperature abnormality at or near the child position, and a drive capability of at least one of the first control element and the second control element based on the abnormality signal detected by the temperature abnormality detection unit; And a temperature abnormality control unit for controlling the temperature.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the temperature abnormality control unit controls the drive capability of at least one of the first control element and the second control element based on the abnormality signal detected by the temperature abnormality detection unit (set to an off state or half For example, in a situation where the output terminal is short-circuited, an excessive current flows, the temperature in the vicinity of the output terminal rises abnormally, a temperature abnormality is detected, and the first control element or The second control element suppresses an abnormal (excessive) output current. Also, at the time of start-up, since a large current flows due to the inrush current and the temperature rises rapidly, the driving ability of the first control element or the second control element is controlled, and the inrush current is suppressed. It is possible to control the time required for rising. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected between a source and the output terminal, and a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control voltage generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the output terminal. And providing a control voltage output from the control voltage generator in common to both the first control element and the second control element, and in series with one of the first control element and the second control element. Connected controllable switch and previous An abnormal voltage detection unit is provided that detects the presence or absence of an abnormal voltage based on a voltage appearing at an output terminal and a reference voltage output from the reference voltage source, and controls on / off of the switch according to the presence or absence of the abnormal voltage. Features.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. Further, since the abnormal voltage control unit performs on / off control of the switch based on the abnormal voltage detected by the abnormal voltage detection unit, it is possible to perform on / off control of the current flowing through the first control element or the second control element. . Therefore, for example, in a situation where the output terminal is short-circuited, an abnormal voltage is detected, the switch is turned off, and the first control element or the second control element has an abnormal (excessive) output. Suppresses current. Also, at the time of start-up, the current of the first control element or the second control element is interrupted until the output voltage is stabilized, thereby suppressing the inrush current and controlling the time required for the start-up. Is possible. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In the stabilized power supply circuit of the present invention, the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other, or one resistance voltage dividing circuit having a plurality of outputs. It is characterized by that.

  With this configuration, since a resistance voltage dividing circuit is used, a level proportional to the voltage appearing at the output terminal can be detected.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected between a source and the output terminal, and a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control voltage generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the output terminal. And providing a control voltage output from the control voltage generator in common to both the first control element and the second control element, and in series with one of the first control element and the second control element. Connected controllable switch and previous An abnormal current detection unit that detects the presence or absence of an abnormal current based on a signal proportional to the current flowing through the output terminal and a reference voltage output from the reference voltage source, and controls on / off of the switch according to the presence or absence of the abnormal current; It is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, since the abnormal current control unit performs on / off control of the switch based on the abnormal current detected by the abnormal current detection unit, the current flowing through the first control element or the second control element can be controlled on / off. . Therefore, for example, in a situation where the output terminal is short-circuited, an excessive current is detected, the switch is turned off, and the first control element or the second control element has an abnormal (excessive) output. Suppresses current. Further, even during startup, while a large current is flowing due to the inrush current, the current of the first control element or the second control element is interrupted to suppress the inrush current or to increase the time required for the rise. It becomes possible to control. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected between a source and the output terminal, and a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control voltage generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the output terminal. And providing a control voltage output from the control voltage generator in common to both the first control element and the second control element, and in series with one of the first control element and the second control element. Connected controllable switch and previous Based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source, the position of the output terminal or the presence or absence of a temperature abnormality in the vicinity thereof is detected, and the switch is turned on / off according to the presence or absence of the temperature abnormality. A temperature abnormality detection unit is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. Further, since the temperature abnormality control unit performs on / off control of the switch based on the abnormality signal detected by the temperature abnormality detection unit, the current flowing through the first control element or the second control element can be controlled on / off. . Accordingly, for example, in a situation where the output terminal is short-circuited, an excessive current flows, the temperature in the vicinity of the output terminal rises abnormally, a temperature abnormality is detected, the switch is turned off, and the first The control element or the second control element suppresses an abnormal (excessive) output current. Also, at the time of start-up, since a large current flows due to the inrush current and the temperature rises rapidly, the switch is turned off to cut off the current of the first control element or the second control element, and the inrush current It is possible to control the time required for rising. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected to the output of the source, an inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, and a connection to the output terminal And a control for providing a control signal of the current control unit with a pulse signal that changes in accordance with a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a signal generation unit, the current control unit including a plurality of control elements connected in parallel to the inductor, and a control input of each of the plurality of control elements. Against, characterized in providing a single pulse signal output from the control signal generating unit in common.

  With this configuration, since a plurality of control elements connected in parallel to the current control unit are provided, the current flowing from the output terminal to the load passes through a plurality of paths from the power source through the respective control elements. It will be supplied to the load. Therefore, for example, in a situation where the output terminal is short-circuited, even if an overcurrent flows, the current flows in a distributed manner to a plurality of control elements, so that the heat generation of each control element can be suppressed.

  Further, if an FET is employed as the control element, the maximum value of the current flowing through each control element can be automatically suppressed. Therefore, each control element does not repeat intermittent on / off operation even for an inrush current generated when the power supply is started up, and the output voltage can be quickly raised while the current is limited to the maximum value. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected to the output of the source, an inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, and a connection to the output terminal And a control for providing a control signal of the current control unit with a pulse signal that changes in accordance with a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a signal generation unit, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor, and generates a control signal Part An abnormal voltage is applied to at least one of the first control element and the second control element, and an abnormal voltage is detected based on a voltage appearing at the output terminal and a reference voltage output from the reference voltage source. A voltage detection unit, and an abnormal voltage control unit that controls at least one drive capability of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit; Features.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the abnormal voltage control unit controls the drive capability of at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit (set to an off state or half For example, when the output terminal is short-circuited, an abnormal voltage is detected, and the first control element or the second control element suppresses an abnormal (excessive) output current. To do. Also, at the time of start-up, until the output voltage stabilizes, the drive capability of the first control element or the second control element is controlled to suppress the inrush current or control the time required for the start-up. It becomes possible to do. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In the stabilized power supply circuit of the present invention, the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other, or one resistance voltage dividing circuit having a plurality of outputs. It is characterized by that.

  With this configuration, since a resistance voltage dividing circuit is used, a level proportional to the voltage appearing at the output terminal can be detected. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected to the output of the source, an inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, and a connection to the output terminal And a control for providing a control signal of the current control unit with a pulse signal that changes in accordance with a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a signal generation unit, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor, and generates a control signal Part A pulse signal to be applied is applied to at least one of the first control element and the second control element, and the presence or absence of an abnormal current is detected based on the current flowing through the inductor and the reference voltage output from the reference voltage source. An abnormal current detection unit and an abnormal current control unit that controls at least one of the first control element and the second control element according to the presence or absence of the abnormal current detected by the abnormal current detection unit are provided. It is characterized by that.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the abnormal current control unit controls the driving ability of at least one of the first control element and the second control element based on the abnormal current detected by the abnormal current detection unit (set to an OFF state or half For example, in a situation where the output terminal is short-circuited, an excessive current is detected, and the first control element or the second control element suppresses an abnormal (excessive) output current. To do. Also, at the time of start-up, while a large current is flowing due to the inrush current, the drive capability of the first control element or the second control element is controlled to suppress the inrush current or to require the rise. It becomes possible to control the time. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected to the output of the source, an inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, and a connection to the output terminal And a control for providing a control signal of the current control unit with a pulse signal that changes in accordance with a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a signal generation unit, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor, and generates a control signal Part A pulse signal to be applied is applied to at least one of the first control element and the second control element, and the position of the output terminal is determined based on the voltage appearing at the output terminal and the reference voltage output by the reference voltage source. Alternatively, based on a temperature abnormality detection unit that detects a temperature abnormality in the vicinity thereof and an abnormality signal detected by the temperature abnormality detection unit, the drive capability of at least one of the first control element and the second control element is controlled. A temperature abnormality control unit is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the temperature abnormality control unit controls the drive capability of at least one of the first control element and the second control element based on the abnormality signal detected by the temperature abnormality detection unit (set to an off state or half For example, in a situation where the output terminal is short-circuited, an excessive current flows, the temperature in the vicinity of the output terminal rises abnormally, a temperature abnormality is detected, and the first control element or The second control element suppresses an abnormal (excessive) output current. Also, at the time of start-up, since a large current flows due to the inrush current and the temperature rises rapidly, the driving ability of the first control element or the second control element is controlled, and the inrush current is suppressed. It is possible to control the time required for rising. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected to the output of the source, an inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, and a connection to the output terminal And a control for providing a control signal of the current control unit with a pulse signal that changes in accordance with a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a signal generation unit, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor, and generates a control signal Part A controllable switch connected to at least one of the first control element and the second control element and connected in series with one of the first control element and the second control element; An abnormal voltage detector is provided that detects the presence or absence of an abnormal voltage based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source, and controls the switch on and off according to the presence or absence of the abnormal voltage. It is characterized by.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. Further, since the abnormal voltage control unit performs on / off control of the switch based on the abnormal voltage detected by the abnormal voltage detection unit, it is possible to perform on / off control of the current flowing through the first control element or the second control element. . Therefore, for example, in a situation where the output terminal is short-circuited, an abnormal voltage is detected, the switch is turned off, and the first control element or the second control element has an abnormal (excessive) output. Suppresses the current. Also, at the time of start-up, the current of the first control element or the second control element is interrupted until the output voltage is stabilized, thereby suppressing the inrush current and controlling the time required for the start-up. Is possible. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In the stabilized power supply circuit of the present invention, the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other, or one resistance voltage dividing circuit having a plurality of outputs. It is characterized by that.

  With this configuration, since a resistance voltage dividing circuit is used, a level proportional to the voltage appearing at the output terminal can be detected. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected to the output of the source, an inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, and a connection to the output terminal And a control for providing a control signal of the current control unit with a pulse signal that changes in accordance with a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a signal generation unit, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor, and generates a control signal Part A controllable switch connected to at least one of the first control element and the second control element and connected in series with one of the first control element and the second control element; An abnormal current detection unit is provided that detects the presence or absence of an abnormal current based on a current flowing through the inductor and a reference voltage output from the reference voltage source, and turns the switch on and off according to the presence or absence of the abnormal current. To do.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, since the abnormal current control unit performs on / off control of the switch based on the abnormal current detected by the abnormal current detection unit, the current flowing through the first control element or the second control element can be controlled on / off. . Therefore, for example, in a situation where the output terminal is short-circuited, an excessive current is detected, the switch is turned off, and the first control element or the second control element has an abnormal (excessive) output. Suppresses the current. Further, even during startup, while a large current is flowing due to the inrush current, the current of the first control element or the second control element is interrupted to suppress the inrush current or to increase the time required for the rise. It becomes possible to control. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. A current control unit connected to the output of the source, an inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, and a connection to the output terminal And a control for providing a control signal of the current control unit with a pulse signal that changes in accordance with a control voltage corresponding to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a signal generation unit, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor, and generates a control signal Part A controllable switch connected to at least one of the first control element and the second control element and connected in series with one of the first control element and the second control element; Based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source, a temperature at which the position of the output terminal is detected or its vicinity is detected, and the switch is turned on / off according to the presence or absence of the temperature abnormality An abnormality detection unit is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. Further, since the temperature abnormality control unit performs on / off control of the switch based on the abnormality signal detected by the temperature abnormality detection unit, the current flowing through the first control element or the second control element can be controlled on / off. . Accordingly, for example, in a situation where the output terminal is short-circuited, an excessive current flows, the temperature in the vicinity of the output terminal rises abnormally, a temperature abnormality is detected, the switch is turned off, and the first The control element or the second control element suppresses an abnormal (excessive) output current. Also, at the time of start-up, since a large current flows due to the inrush current and the temperature rises rapidly, the switch is turned off to cut off the current of the first control element or the second control element, and the inrush current It is possible to control the time required for rising. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. An inductor having one end connected to the output of the source; a current control unit connected between the other end of the inductor and ground; a rectifier connected between the other end of the inductor and the output terminal; A capacitor connected to the output terminal, and a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control signal generation unit for giving a control input, wherein the current control unit includes a plurality of control elements connected in parallel to the inductor, and the plurality of control elements Of the respective control input, she characterized in providing a single pulse signal output from the control signal generating unit in common.

  With this configuration, since a plurality of control elements connected in parallel to the current control unit are provided, the current flowing from the output terminal to the load passes through a plurality of paths from the power source through the respective control elements. It will be supplied to the load. Therefore, for example, in a situation where the output terminal is short-circuited, even if an overcurrent flows, the current flows in a distributed manner to a plurality of control elements, so that the heat generation of each control element can be suppressed.

  Further, if an FET is employed as the control element, the maximum value of the current flowing through each control element can be automatically suppressed. Therefore, each control element does not repeat intermittent on / off operation even for an inrush current generated when the power supply is started up, and the output voltage can be quickly raised while the current is limited to the maximum value. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. An inductor having one end connected to the output of the source; a current control unit connected between the other end of the inductor and ground; a rectifier connected between the other end of the inductor and the output terminal; A capacitor connected to the output terminal, and a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control signal generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor Together with The pulse signal output from the control signal generator is applied to at least one of the first control element and the second control element, and based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source An abnormal voltage detection unit that detects an abnormal voltage, and an abnormal voltage control unit that controls the drive capability of at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit And is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the abnormal voltage control unit controls the drive capability of at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit (set to an off state or half For example, when the output terminal is short-circuited, an abnormal voltage is detected, and the first control element or the second control element suppresses an abnormal (excessive) output current. To do. Also, at the time of start-up, until the output voltage stabilizes, the drive capability of the first control element or the second control element is controlled to suppress the inrush current or control the time required for the start-up. It becomes possible to do. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In the stabilized power supply circuit of the present invention, the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other, or one resistance voltage dividing circuit having a plurality of outputs. It is characterized by that.

  With this configuration, since a resistance voltage dividing circuit is used, a level proportional to the voltage appearing at the output terminal can be detected. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. An inductor having one end connected to the output of the source; a current control unit connected between the other end of the inductor and ground; a rectifier connected between the other end of the inductor and the output terminal; A capacitor connected to the output terminal, and a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control signal generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor Together with The pulse signal output from the control signal generator is applied to at least one of the first control element and the second control element, and an abnormality occurs based on the current flowing through the rectifier and the reference voltage output from the reference voltage source. An abnormal current detector that detects the presence or absence of current, and an abnormality that controls the drive capability of at least one of the first control element and the second control element according to the presence or absence of the abnormal current detected by the abnormal current detector And a current control unit.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the abnormal current control unit controls the driving ability of at least one of the first control element and the second control element based on the abnormal current detected by the abnormal current detection unit (set to an OFF state or half For example, in a situation where the output terminal is short-circuited, an excessive current is detected, and the first control element or the second control element suppresses an abnormal (excessive) output current. To do. Also, at the time of start-up, while a large current is flowing due to the inrush current, the drive capability of the first control element or the second control element is controlled to suppress the inrush current or to require the rise. It becomes possible to control the time. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. An inductor having one end connected to the output of the source; a current control unit connected between the other end of the inductor and ground; a rectifier connected between the other end of the inductor and the output terminal; A capacitor connected to the output terminal, and a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control signal generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor Together with The pulse signal output from the control signal generator is applied to at least one of the first control element and the second control element, and based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source A temperature abnormality detection unit for detecting a temperature abnormality at or near the position of the output terminal, and at least one of the first control element and the second control element based on the abnormality signal detected by the temperature abnormality detection unit And a temperature abnormality control unit for controlling the driving ability of the apparatus.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, the temperature abnormality control unit controls the drive capability of at least one of the first control element and the second control element based on the abnormality signal detected by the temperature abnormality detection unit (set to an off state or half For example, in a situation where the output terminal is short-circuited, an excessive current flows, the temperature in the vicinity of the output terminal rises abnormally, a temperature abnormality is detected, and the first control element or The second control element suppresses an abnormal (excessive) output current. Also, at the time of start-up, since a large current flows due to the inrush current and the temperature rises rapidly, the driving ability of the first control element or the second control element is controlled, and the inrush current is suppressed. It is possible to control the time required for rising. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. An inductor having one end connected to the output of the source; a current control unit connected between the other end of the inductor and ground; a rectifier connected between the other end of the inductor and the output terminal; A capacitor connected to the output terminal, and a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control signal generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor Together with The pulse signal output from the control signal generator is applied to at least one of the first control element and the second control element, and is connected in series with one of the first control element and the second control element. An abnormal voltage detection that detects the presence or absence of an abnormal voltage based on a controllable switch, the voltage appearing at the output terminal and the reference voltage output from the reference voltage source, and controls the switch on / off according to the presence or absence of the abnormal voltage And a portion.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. Further, since the abnormal voltage control unit performs on / off control of the switch based on the abnormal voltage detected by the abnormal voltage detection unit, it is possible to perform on / off control of the current flowing through the first control element or the second control element. . Therefore, for example, in a situation where the output terminal is short-circuited, an abnormal voltage is detected, the switch is turned off, and the first control element or the second control element has an abnormal (excessive) output. Suppresses the current. Also, at the time of start-up, the current of the first control element or the second control element is interrupted until the output voltage is stabilized, thereby suppressing the inrush current and controlling the time required for the start-up. Is possible. Note that it is desirable to employ FETs for the first control element and the second control element, respectively.

  In the stabilized power supply circuit of the present invention, the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other, or one resistance voltage dividing circuit having a plurality of outputs. It is characterized by that.

  With this configuration, since a resistance voltage dividing circuit is used, a level proportional to the voltage appearing at the output terminal can be detected. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. An inductor having one end connected to the output of the source; a current control unit connected between the other end of the inductor and ground; a rectifier connected between the other end of the inductor and the output terminal; A capacitor connected to the output terminal, and a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control signal generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor Together with The pulse signal output from the control signal generator is applied to at least one of the first control element and the second control element, and is connected in series with one of the first control element and the second control element. A controllable switch, an abnormal current detector for detecting the presence / absence of an abnormal current based on the current flowing through the rectifier and the reference voltage output from the reference voltage source, and controlling the switch on / off according to the presence / absence of the abnormal current And is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. In addition, since the abnormal current control unit performs on / off control of the switch based on the abnormal current detected by the abnormal current detection unit, the current flowing through the first control element or the second control element can be controlled on / off. . Therefore, for example, in a situation where the output terminal is short-circuited, an excessive current is detected, the switch is turned off, and the first control element or the second control element has an abnormal (excessive) output. Suppresses the current. Further, even during startup, while a large current is flowing due to the inrush current, the current of the first control element or the second control element is interrupted to suppress the inrush current or to increase the time required for the rise. It becomes possible to control. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  In addition, the stabilized power supply circuit of the present invention includes a reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, and power that supplies DC power. An inductor having one end connected to the output of the source; a current control unit connected between the other end of the inductor and ground; a rectifier connected between the other end of the inductor and the output terminal; A capacitor connected to the output terminal, and a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit. A stabilized power supply circuit including a control signal generation unit for supplying a control input, wherein the current control unit includes a first control element and a second control element connected in parallel to the inductor Together with The pulse signal output from the control signal generator is applied to at least one of the first control element and the second control element, and is connected in series with one of the first control element and the second control element. Based on a controllable switch, a voltage appearing at the output terminal, and a reference voltage output by the reference voltage source, a temperature abnormality in the position of the output terminal or in the vicinity thereof is detected, and depending on whether there is a temperature abnormality A temperature abnormality detection unit that controls on / off of the switch is provided.

  With this configuration, the voltage appearing at the output terminal can be maintained at a specified level by controlling at least one of the first control element and the second control element. Further, since the temperature abnormality control unit performs on / off control of the switch based on the abnormality signal detected by the temperature abnormality detection unit, the current flowing through the first control element or the second control element can be controlled on / off. . Accordingly, for example, in a situation where the output terminal is short-circuited, an excessive current flows, the temperature in the vicinity of the output terminal rises abnormally, a temperature abnormality is detected, the switch is turned off, and the first The control element or the second control element suppresses an abnormal (excessive) output current. Also, at the time of start-up, since a large current flows due to the inrush current and the temperature rises rapidly, the switch is turned off to cut off the current of the first control element or the second control element, and the inrush current It is possible to control the time required for rising. Note that it is desirable to employ FETs for the first control element and the second control element, respectively. In addition, a power supply device of a so-called synchronous rectification type DCDC converter in which the rectifier is a control element (for example, FET (field effect transistor)) and is turned on and off in a phase opposite to the control element controlled by the control signal generator. Absent.

  As described above, the stabilized power supply circuit according to the present invention distributes heat generation in a state in which an overcurrent flows due to an output short-circuit, or other voltage abnormal state, current abnormal state, or temperature abnormal state. Heat generation can be suppressed and safety can be improved by limiting the drive capability of the output current. Also, when starting up, if a large current flows due to an inrush current resulting in a voltage abnormal state, current abnormal state, or temperature abnormal state, turn off some control elements provided in the current control unit. Alternatively, a stable and quick start-up operation is possible by setting the semi-conducting state.

(First embodiment)
The configuration of the stabilized power supply according to the first embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 1 will be described below.

  1 includes a reference power supply (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a current control unit 3, a power supply 4, an output voltage detection resistor 5, and an output (output terminal). 16). A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example shown in FIG. 1, a case where the same voltage is supplied to a plurality of (n) power supply lines 4-1, 4-2,. Assumed. The same voltage may be supplied to a plurality of power supply lines 4-1, 4-2,..., 4-n from a single power supply device, or a plurality of power supply lines 4-1, 4-2. , ..., 4-n may be combined into a single power supply line.

  The output voltage detection resistor 5 is composed of two resistors connected between the output 16 and the ground, and is determined by the ratio between the output voltage appearing at the output 16 and the resistance value of the two resistors. Output the compressed voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the control input of the current control unit 3. It is connected.

  The current control unit 3 includes n FETs (field effect transistors) 3-1 to 3-n. The inputs (drain terminals) of the FETs 3-1 to 3-n are connected to the power supply 4, and the outputs (source terminals) of the FETs 3-1 to 3-n are connected to the output 16. The control input (gate terminal) is connected to the output of the operational amplifier 2. That is, n FETs 3-1 to 3-n are connected in parallel to the output 16, and the same signal output from the operational amplifier 2 is input in common to the control inputs of the n FETs 3-1 to 3-n. Is done.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied as a gate voltage to the n FETs 3-1 to 3-n of the current control unit 3.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is kept constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  Here, since the current control unit 3 is composed of n FETs connected in parallel, the current supplied from the output 16 to the load at the connection destination (not shown) is n in the current control unit 3. Distributed in the route. That is, the current corresponding to the load capacity is distributed and handled by the n FETs.

  Therefore, for example, when the output 16 is short-circuited and an overcurrent flows through the output 16, the current control unit 3 generates heat. However, since the amount of generated heat is distributed to n, The amount of heat borne by each FET inside the control unit 3 is relatively small. Therefore, an extreme temperature rise of the device can be suppressed.

(Second Embodiment)
The configuration of a stabilized power supply according to the second embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 2 will be described below.

  2 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power source 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a gate voltage control unit 9. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 2, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply devices. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. The abnormality detection resistor 7 is used to detect an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. It is connected to the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power supply 4, the output (source terminal) of the current control unit 6 is connected to the output 16, and the control input (gate terminal) of the current control unit 6 is the gate voltage. The output of the control unit 9 is connected. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is It is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 can also be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is kept constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the abnormality detection resistor 7 (voltage proportional to the output voltage). Applied to the input of the gate voltage controller 9.

  The gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6 when a voltage at which the output voltage is determined to be abnormal is input according to the value input from the operational amplifier 8. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the control signal output from the operational amplifier 2 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output voltage, and the current driving capability relating to the feeding of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power supply shown in FIG. 2 is capable of detecting an abnormality in the output voltage in a state where the output voltage decreases due to an overcurrent due to a short circuit of the output 16 or other abnormal states of the output voltage. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(Third embodiment)
The configuration of a stabilized power supply according to the third embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power supply shown in FIG. 3 will be described below.

  3 includes a reference power supply (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power supply 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, an abnormality detection operational amplifier 8, and a gate voltage control unit 9. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 3, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply devices. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detecting resistor 5 is composed of three resistors (5-1, 5-2, 5-3) connected between the output 16 and the ground, and has two outputs. . At each output of the output voltage detection resistor 5, a divided voltage determined by the output voltage appearing at the output 16 and the ratio of the resistance values of the three resistors appears. One voltage is used for adjusting the output voltage, and the other voltage is used for detecting an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. It is connected to the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power supply 4, the output (source terminal) of the current control unit 6 is connected to the output 16, and the control input (gate terminal) of the current control unit 6 is the gate voltage. The output of the control unit 9 is connected. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 8 for abnormality detection, and the output (for abnormal voltage detection) of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 8 for abnormality detection. The output terminal of the operational amplifier 8 is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 can also be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current controller 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the output voltage detection resistor 5 (voltage proportional to the output voltage). Is applied to the input of the gate voltage control unit 9.

  The gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6 when a voltage at which the output voltage is determined to be abnormal is input according to the value input from the operational amplifier 8. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the control signal output from the operational amplifier 2 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output voltage, and the current driving capability relating to the feeding of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power supply shown in FIG. 3 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent flowing due to a short circuit of the output 16 or other abnormal output voltage. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(Fourth embodiment)
FIG. 4 shows the configuration of a stabilized power supply according to the fourth embodiment of the present invention. The configuration and operation of the stabilized power source shown in FIG. 4 will be described below.

  4 includes a reference power supply (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power supply 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, a current detection unit 10, an abnormality detection operational amplifier 8, and a gate voltage control unit 9. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 4, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from power supply devices independent of each other. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The current detector 10 is inserted in the current path of the output 16 and detects the magnitude of the current flowing from the output 16 to the load.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. It is connected to the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power supply 4, the output (source terminal) of the current control unit 6 is connected to the output 16, and the control input (gate terminal) of the current control unit 6 is the gate voltage. The output of the control unit 9 is connected. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the current detection unit 10 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is a gate. It is connected to the input of the voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output current.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 can also be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is kept constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the abnormality detection operational amplifier 8 gates a voltage value corresponding to the difference between a constant reference voltage input from the reference power supply 1 and a detection signal (voltage proportional to the output current) input from the current detection unit 10. Applied to the input of the voltage controller 9.

  The gate voltage control unit 9 sets a voltage for turning off the current control unit 6 when the voltage at which the output current is determined to be abnormal (excessive) is input according to the value input from the operational amplifier 8. The current driving capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. When the voltage at which the output current is determined to be abnormal is not input (normal), the control signal output from the operational amplifier 2 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output current, and the current driving capability relating to the power supply of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power source shown in FIG. 4 can detect the abnormality and limit the drive capability of the output current in an abnormal state in which an overcurrent flows due to a cause such as the output 16 being short-circuited. . In addition, when the stabilized power supply is turned on, if the output current is a certain value or more, the current control unit 6 can be cut off or set in a semi-conducting state. Quick start-up operation is possible.

(Fifth embodiment)
The configuration of a stabilized power supply according to the fifth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 5 will be described below.

  The stabilized power source shown in FIG. 5 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power source 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a gate voltage control unit 9. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example shown in FIG. 5, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply devices. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The anomaly detection resistor 7 is composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and one resistor 7-2 is a thermistor. . The resistance value of the thermistor (7-2) changes according to the temperature in the vicinity of the output 16. Accordingly, a divided voltage determined by the output voltage appearing at the output 16 and the ratio of the resistance values of the two resistors is output from the abnormality detection resistor 7, and this voltage changes according to the detected temperature. That is, the abnormality detection resistor 7 is used for detecting a temperature abnormality.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. It is connected to the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power supply 4, the output (source terminal) of the current control unit 6 is connected to the output 16, and the control input (gate terminal) of the current control unit 6 is the gate voltage. The output of the control unit 9 is connected. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is It is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 can also be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current controller 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage corresponding to the detection temperature) input from the abnormality detection resistor 7. Applied to the input of the gate voltage controller 9.

  When a voltage at which the detected temperature is determined to be abnormal is input according to the value input from the operational amplifier 8, the gate voltage control unit 9 sets the voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. When the voltage at which the detected temperature is determined to be abnormal is not input (normal), the control signal output from the operational amplifier 2 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the detected temperature, and the current driving capability relating to the power supply of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power source shown in FIG. 5 detects the temperature abnormality in a state where the temperature near the output rises abnormally due to overcurrent flowing due to the output 16 being short-circuited, and the like. It is possible to limit the driving ability. In addition, when the stabilized power supply is turned on, if the output temperature is a certain value or more, the current control unit 6 can be cut off or made into a semi-conducting state, so that it is stable while reducing inrush current. Quick start-up operation is possible.

(Sixth embodiment)
FIG. 6 shows the configuration of a stabilized power supply according to the sixth embodiment of the present invention. The configuration and operation of the stabilized power source shown in FIG. 6 will be described below.

  The stabilized power source shown in FIG. 6 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power source 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a switch 11. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example shown in FIG. 6, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from power supply devices independent of each other. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the voltage appearing at the output 16 and the resistance values of the two resistors. The voltage divided in accordance with the voltage dividing ratio determined by is output from the abnormality detection resistor 7. That is, the abnormality detection resistor 7 is used to detect an abnormality in the output voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. The control input of the current control unit 6 is connected.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power source 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16. (Gate terminal) is connected to the output of the operational amplifier 2. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The switch 11 is assumed to be capable of being turned on and off by electrical control, and an FET (field effect transistor), a mechanically operated relay, or the like can be used.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is The control input of the switch 11 is connected. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output voltage abnormality.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 is applied to the FET of the current control unit 6 as a gate voltage.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current controller 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the abnormality detection operational amplifier 8 corresponds to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage (voltage for detecting an abnormality in the output voltage) input from the abnormality detection resistor 7. The switch 11 is on / off controlled according to the magnitude of the voltage value. Specifically, when a voltage at which the output voltage is determined to be abnormal is input to the voltage abnormality detection operational amplifier 8, the switch 11 is turned off (contact open), and the voltage at which the output voltage is determined to be abnormal is input. If not, the switch 11 is turned on (contact closed).

  Therefore, the stabilized power supply shown in FIG. 6 detects an abnormality in the output voltage in a state where the output voltage is lowered due to an overcurrent caused by the output 16 being short-circuited or other abnormal states of the output voltage. In addition, it is possible to limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output voltage is below a certain value, the switch 11 is turned off, so that a stable and quick start-up operation can be performed while reducing the inrush current.

(Seventh embodiment)
FIG. 7 shows the configuration of a stabilized power supply according to the seventh embodiment of the present invention. The configuration and operation of the stabilized power source shown in FIG. 7 will be described below.

  7 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power source 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, an abnormality detection operational amplifier 8, and a switch 11. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 7, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from power supply devices independent of each other. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detecting resistor 5 is composed of three resistors (5-1, 5-2, 5-3) connected between the output 16 and the ground. Two types of divided voltages determined by the ratio of the resistance values of the three resistors are output to the two output terminals. One of the two types of voltage is used for stabilizing the output voltage, and the other is used for detecting an abnormality in the output voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. The control input of the current control unit 6 is connected.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power source 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16. (Gate terminal) is connected to the output of the operational amplifier 2. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The switch 11 is assumed to be capable of being turned on and off by electrical control, and an FET (field effect transistor), a mechanically operated relay, or the like can be used.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the output voltage detection resistor 5 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8. Is connected to the control input of the switch 11. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output voltage abnormality.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 is applied to the FET of the current control unit 6 as a gate voltage.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current controller 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the operational amplifier 8 for detecting abnormality corresponds to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage (voltage for detecting abnormal voltage) input from the output voltage detection resistor 5. The switch 11 is on / off controlled according to the magnitude of the voltage value. Specifically, when a voltage at which the output voltage is determined to be abnormal is input to the voltage abnormality detection operational amplifier 8, the switch 11 is turned off (contact open), and the voltage at which the output voltage is determined to be abnormal is input. If not, the switch 11 is turned on (contact closed).

  Therefore, the stabilized power supply shown in FIG. 7 detects an abnormality in the output voltage in a state where the output voltage decreases due to an overcurrent flowing due to the output 16 being short-circuited, or in other abnormal states of the output voltage. In addition, it is possible to limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output voltage is below a certain value, the switch 11 is turned off, so that a stable and quick start-up operation can be performed while reducing the inrush current.

(Eighth embodiment)
FIG. 8 shows the configuration of a stabilized power supply according to the eighth embodiment of the present invention. The configuration and operation of the stabilized power source shown in FIG. 8 will be described below.

  8 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power source 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, a current detection unit 10, an operational amplifier 8 for abnormality detection, and a switch 11. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 8, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply devices. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output. One of these voltages is used to stabilize the output voltage.

  The current detection unit 10 detects an output current flowing through the output 16 to the load, and outputs a signal indicating the magnitude of the current.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. The control input of the current control unit 6 is connected.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power source 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16. (Gate terminal) is connected to the output of the operational amplifier 2. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The switch 11 is assumed to be capable of being turned on and off by electrical control, and an FET (field effect transistor), a mechanically operated relay, or the like can be used.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the current detection unit 10 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is a switch. 11 control inputs. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output current abnormality.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 is applied to the FET of the current control unit 6 as a gate voltage.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current controller 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection signal (voltage for detecting an abnormal current) input from the current detection unit 10. The switch 11 is turned on / off according to the magnitude of the. Specifically, when a voltage at which the output current is determined to be abnormal (excessive) is input to the voltage abnormality detection operational amplifier 8, the switch 11 is turned off (contact open), and the voltage at which the output current is determined to be abnormal. Is not input, the switch 11 is turned on (contact closed).

  Therefore, the stabilized power source shown in FIG. 8 detects the abnormality in a state where the output voltage decreases due to an overcurrent flowing due to the output 16 being short-circuited, or in other abnormal states of the output current, It is possible to limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output current is a certain value or more, the switch 11 is turned off, thereby enabling a stable and quick startup operation while reducing the inrush current.

(Ninth embodiment)
FIG. 9 shows the configuration of a stabilized power supply according to the ninth embodiment of the present invention. The configuration and operation of the stabilized power source shown in FIG. 9 will be described below.

  The stabilized power source shown in FIG. 9 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, current control units 3 and 6, a power source 4, an output voltage detection resistor 5, and an output ( Output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a switch 11. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 9, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from power supply devices independent of each other. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output. One of these voltages is used to stabilize the output voltage.

  The abnormality detection resistor 7 is composed of two resistors (7-1, 7-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. One resistor 7-2 is a thermistor, and its resistance value changes according to the temperature near the output 16. Therefore, the voltage output from the abnormality detection resistor 7 is used to detect a temperature abnormality.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is the control input of the current control unit 3. The control input of the current control unit 6 is connected.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, the output (source terminal) of the current control unit 3 is connected to the output 16, and the control input (gate terminal) of the current control unit 3 is the output of the operational amplifier 2. Connected with. Further, the input (drain terminal) of the current control unit 6 is connected to the power source 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16. (Gate terminal) is connected to the output of the operational amplifier 2. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The switch 11 is assumed to be capable of being turned on and off by electrical control, and an FET (field effect transistor), a mechanically operated relay, or the like can be used.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is The control input of the switch 11 is connected. The switch 11 is provided to control the current driving capability of the current control unit 6 in response to the detected temperature abnormality.

  The operational amplifier 2 outputs, as a control signal, a voltage value corresponding to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage proportional to the output voltage) input from the output voltage detection resistor 5. To do. This control signal is applied to the FET of the current control unit 3 as a gate voltage. The control signal output from the operational amplifier 2 is applied to the FET of the current control unit 6 as a gate voltage.

  The current control unit 3 controls the current flowing from the power source 4 to the output 16 according to the level of the input control signal. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current controller 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  On the other hand, the abnormality detection operational amplifier 8 is a voltage corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection signal (voltage for detecting temperature abnormality) input from the abnormality detection resistor 7. The switch 11 is on / off controlled according to the magnitude of the value. Specifically, when a voltage at which the output temperature is determined to be abnormal is input to the voltage abnormality detection operational amplifier 8, the switch 11 is turned off (contact open), and the voltage at which the output temperature is determined to be abnormal is detected. If there is no input, the switch 11 is turned on (contact closed).

  Therefore, the stabilized power source shown in FIG. 9 is capable of correcting the abnormality in a state where the output temperature is abnormally increased due to an overcurrent flowing due to the output 16 being short-circuited or other abnormal states of the output current. It is possible to detect and limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output temperature is equal to or higher than a certain value, the switch 11 is turned off, thereby enabling a stable and quick start-up operation while reducing the inrush current.

(Tenth embodiment)
The configuration of the stabilized power supply according to the tenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 10 will be described below.

  10 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, a current control unit 3, a power source 4, a diode 15, and an inductor 12. And a capacitor 13 and an output (output terminal) 16. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example shown in FIG. 10, the same voltage is supplied to each of a plurality (n) of power supply lines 4-1, 4-2,. Assumed. The same voltage may be supplied to a plurality of power supply lines 4-1, 4-2,..., 4-n from a single power supply device, or a plurality of power supply lines 4-1, 4-2. , ..., 4-n may be combined into a single power supply line.

  The output voltage detection resistor 5 is composed of two resistors connected between the output 16 and the ground, and is determined by the ratio between the output voltage appearing at the output 16 and the resistance value of the two resistors. Output the compressed voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3.

  The current control unit 3 includes n FETs (field effect transistors) 3-1 to 3-n. The inputs (drain terminals) of the FETs 3-1 to 3-n are connected to the power supply 4, and the outputs (source terminals) of the FETs 3-1 to 3-n are connected to the output 16 via the inductor 12, The control inputs (gate terminals) of −1 to 3-n are connected to the output of the drive circuit unit 14. That is, the n FETs 3-1 to 3-n are connected in parallel to the output 16, and the same pulse signal output from the drive circuit unit 14 is input to the control inputs of the n FETs 3-1 to 3-n. Input in common.

  The cathodes of the diodes 15 are connected to the outputs (source terminals) of the FETs 3-1 to 3-n, and the anodes of the diodes 15 are connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 controls the current flowing therethrough so that the output voltage appearing at the output 16 is kept constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  Here, since the current control unit 3 is composed of n FETs connected in parallel, the current supplied from the output 16 to the load at the connection destination (not shown) is n in the current control unit 3. Distributed in the route. That is, the current corresponding to the load capacity is distributed and handled by the n FETs.

  Therefore, for example, when the output 16 is short-circuited and an overcurrent flows through the output 16, the current control unit 3 generates heat. However, since the amount of generated heat is distributed to n, The amount of heat borne by each FET inside the control unit 3 is relatively small. Therefore, an extreme temperature rise of the device can be suppressed.

(Eleventh embodiment)
The configuration of a stabilized power supply according to the eleventh embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 11 will be described below.

  A stabilized power source shown in FIG. 11 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, The capacitor 13, the power supply 4, the output voltage detection resistor 5, the output (output terminal) 16, the abnormality detection resistor 7, the abnormality detection operational amplifier 8, and the gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 11, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply apparatuses. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. The abnormality detection resistor 7 is used to detect an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the inductor 12, and the control input (gate terminal) of the current control unit 3 Is connected to the output of the drive circuit section 14. The input (drain terminal) of the current control unit 6 is connected to the power supply 4, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the inductor 12, and the control input (gate) of the current control unit 6 is connected. Terminal) is connected to the output of the gate voltage controller 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is It is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the abnormality detection resistor 7 (voltage proportional to the output voltage). Applied to the input of the gate voltage controller 9.

  The gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6 when a voltage at which the output voltage is determined to be abnormal is input according to the value input from the operational amplifier 8. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the control signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output voltage, and the current driving capability relating to the feeding of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power supply shown in FIG. 11 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent due to the output 16 being short-circuited, or in other abnormal states of the output voltage. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(Twelfth embodiment)
The configuration of a stabilized power supply according to the twelfth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 12 will be described below.

  The stabilized power source shown in FIG. 12 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection operational amplifier 8, and a gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example shown in FIG. 12, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply apparatuses. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detecting resistor 5 is composed of three resistors (5-1, 5-2, 5-3) connected between the output 16 and the ground. Two types of divided voltages determined by the ratio of the resistance values of the three resistors are output to the two output terminals. One of the two types of voltage is used for stabilizing the output voltage, and the other is used for detecting an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the inductor 12, and the control input (gate terminal) of the current control unit 3 Is connected to the output of the drive circuit section 14. The input (drain terminal) of the current control unit 6 is connected to the power supply 4, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the inductor 12, and the control input (gate) of the current control unit 6 is connected. Terminal) is connected to the output of the gate voltage controller 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the output voltage detection resistor 5 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8. Is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage (voltage for detecting an abnormality in the output voltage) input from the output voltage detection resistor 5. The corresponding voltage value is applied to the input of the gate voltage control unit 9.

  The gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6 when a voltage at which the output voltage is determined to be abnormal is input according to the value input from the operational amplifier 8. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the control signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output voltage, and the current driving capability relating to the feeding of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power source shown in FIG. 12 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent due to a short circuit of the output 16 or in other abnormal output voltage states. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(Thirteenth embodiment)
The configuration of a stabilized power supply according to the thirteenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 13 will be described below.

  The stabilized power source shown in FIG. 13 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, The capacitor 13, the power supply 4, the output voltage detection resistor 5, the output (output terminal) 16, the current detection unit 10, the abnormality detection operational amplifier 8, and the gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 13, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from power supply devices independent of each other. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output. This voltage is used to stabilize the output voltage.

  The current detection unit 10 detects a current flowing through the load from the output 16 and outputs a signal representing the magnitude of the current as a voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the current detection unit 10 and the inductor 12. The input (gate terminal) is connected to the output of the drive circuit unit 14. Further, the input (drain terminal) of the current control unit 6 is connected to the power supply 4, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the current detection unit 10 and the inductor 12. The control input (gate terminal) is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the current detection unit 10 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is a gate. It is connected to the input of the voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output current.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the operational amplifier 8 for abnormality detection corresponds to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage for detecting an abnormality in the output current) input from the current detection unit 10. A voltage value is applied to the input of the gate voltage control unit 9.

  When a voltage at which the output current is determined to be abnormal is input according to the value input from the operational amplifier 8, the gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. When the voltage at which the output current is determined to be abnormal is not input (normal), the control signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output current, and the current driving capability relating to the power supply of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power source shown in FIG. 13 detects the abnormality in a state where the output voltage decreases due to an overcurrent flowing due to a short circuit of the output 16 or other abnormal state of the output current. It is possible to limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output current is a certain value or more, the current control unit 6 can be cut off or set in a semi-conducting state. Quick start-up operation is possible.

(Fourteenth embodiment)
The configuration of a stabilized power supply according to the fourteenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 14 will be described below.

  14 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, The capacitor 13, the power supply 4, the output voltage detection resistor 5, the output (output terminal) 16, the abnormality detection resistor 7, the abnormality detection operational amplifier 8, and the gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 14, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from power supply devices independent of each other. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output. This voltage is used to stabilize the output voltage.

  The abnormality detection resistor 7 is composed of two resistors (7-1, 7-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. Moreover, the thermistor is used for one resistor 7-2. Therefore, the voltage output from the abnormality detection resistor 7 changes according to the temperature change in the vicinity of the output 16.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the current detection unit 10 and the inductor 12. The input (gate terminal) is connected to the output of the drive circuit unit 14. Further, the input (drain terminal) of the current control unit 6 is connected to the power supply 4, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the current detection unit 10 and the inductor 12. The control input (gate terminal) is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is It is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected temperature abnormality.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the abnormality detection resistor 7 (voltage for detecting an abnormality in the output temperature). The corresponding voltage value is applied to the input of the gate voltage control unit 9.

  When a voltage at which the output temperature is determined to be abnormal is input in accordance with the value input from the operational amplifier 8, the gate voltage control unit 9 sets the voltage for turning off the current control unit 6 to the gate of the current control unit 6. It is possible to limit the current driving capability of the current control unit 6 that is applied to the terminal and controls the power supply of the output terminal 16. When the voltage at which the output temperature is determined to be abnormal is not input (normal), the control signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted according to the degree of temperature abnormality of the output, and the current driving capability relating to the power supply of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power source shown in FIG. 14 detects the abnormality in a state where an overcurrent flows due to a cause such as a short circuit of the output 16 and abnormally generates heat, or other abnormal state, and the output current It is possible to limit the driving ability. In addition, when the stabilized power supply is turned on, if the output temperature is a certain value or more, the current control unit 6 can be cut off or made into a semi-conducting state, so that it is stable while reducing inrush current. Quick start-up operation is possible.

(Fifteenth embodiment)
The configuration of a stabilized power supply according to the fifteenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 15 will be described below.

  The stabilized power source shown in FIG. 15 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 15, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply apparatuses. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. The abnormality detection resistor 7 is used to detect an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  A switch 11 that can be turned on and off by electrical control is used. For example, a field effect transistor (FET) or a relay that can be mechanically turned on and off can be used.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the inductor 12, and the control input (gate terminal) of the current control unit 3 Is connected to the output of the drive circuit section 14. The input (drain terminal) of the current control unit 6 is connected to the power source 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the inductor 12. The control input (gate terminal) 6 is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is The control input of the switch 11 is connected. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output voltage abnormality.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. .

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has the presence or absence of abnormality according to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage input from the abnormality detection resistor 7 (voltage proportional to the output voltage). And the switch 11 is turned on / off according to the result.

  That is, when a voltage at which the output voltage is determined to be abnormal is input, the switch 11 is turned off (opened), the current of the current control unit 6 is cut off, and the power supply of the output terminal 16 is controlled. Current drive capability can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (in the normal case), the switch 11 is kept on, and the current also flows through the current control unit 6.

  Therefore, the stabilized power supply shown in FIG. 15 can prevent abnormal output voltage in a state where the output voltage decreases due to an overcurrent flowing due to a short circuit of the output 16 or other abnormal output voltage. It is possible to detect and limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output voltage is below a certain value, the switch 11 can be controlled to be in an OFF state, so that a stable and quick start-up operation can be performed while reducing the inrush current. Become.

(Sixteenth embodiment)
The configuration of the stabilized power supply according to the sixteenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 16 will be described below.

  16 includes a reference power supply (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 16, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply apparatuses. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detecting resistor 5 is composed of three resistors (5-1, 5-2, 5-3) connected between the output 16 and the ground. Two types of divided voltages determined by the ratio of the resistance values of the three resistors are output to the two output terminals. One of the two kinds of voltages is used for stabilizing the output voltage, and the other is used for detecting an abnormality in the output voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  A switch 11 that can be turned on and off by electrical control is used. For example, a field effect transistor (FET) or a relay that can be mechanically turned on and off can be used.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the inductor 12, and the control input (gate terminal) of the current control unit 3 Is connected to the output of the drive circuit section 14. The input (drain terminal) of the current control unit 6 is connected to the power source 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the inductor 12. The control input (gate terminal) 6 is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the output voltage detection resistor 5 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8. Is connected to the control input of the switch 11. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output voltage abnormality.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. .

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has the presence or absence of abnormality according to the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage input from the abnormality detection resistor 7 (voltage proportional to the output voltage). And the switch 11 is turned on / off according to the result.

  That is, when a voltage at which the output voltage is determined to be abnormal is input, the switch 11 is turned off (opened), the current of the current control unit 6 is cut off, and the power supply of the output terminal 16 is controlled. Current drive capability can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (in the normal case), the switch 11 is kept on, and the current also flows through the current control unit 6.

  Therefore, the stabilized power supply shown in FIG. 16 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent due to the output 16 being short-circuited, or in other abnormal states of the output voltage. It is possible to detect and limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output voltage is below a certain value, the switch 11 can be controlled to be in an OFF state, so that a stable and quick start-up operation can be performed while reducing the inrush current. Become.

(Seventeenth embodiment)
The configuration of the stabilized power supply according to the seventeenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 17 will be described below.

  17 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, a current detection unit 10, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 17, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply apparatuses. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The current detection unit 10 detects a current flowing through the load from the output 16 and outputs a voltage representing the magnitude of the current.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  A switch 11 that can be turned on and off by electrical control is used. For example, a field effect transistor (FET) or a relay that can be mechanically turned on and off can be used.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the current detection unit 10 and the inductor 12. The input (gate terminal) is connected to the output of the drive circuit unit 14. The input (drain terminal) of the current control unit 6 is connected to the power supply 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the current detection unit 10 and the inductor 12. The control input (gate terminal) of the current control unit 6 is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the current detection unit 10 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is a switch. 11 control inputs. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output current abnormality.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. .

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 determines whether there is an abnormality according to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the current detection unit 10 (voltage proportional to the output current). The switch 11 is turned on / off according to the identification result.

  That is, when a voltage for determining that the output current is abnormal is input, the switch 11 is turned off (opened), the current of the current control unit 6 is cut off, and the power supply of the output terminal 16 is controlled. Current drive capability can be limited. Further, when the voltage at which the output current is determined to be abnormal is not input (normal), the switch 11 is kept on and current also flows through the current control unit 6.

  Therefore, the stabilized power source shown in FIG. 17 detects the abnormality in a state where the output voltage decreases due to an overcurrent flowing due to a short circuit of the output 16 or other abnormal state of the output current. It is possible to limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output current is a certain value or more, the switch 11 can be controlled to be in an OFF state, so that a stable and quick start-up operation can be performed while reducing the inrush current. Become.

(Eighteenth embodiment)
The configuration of a stabilized power supply according to the eighteenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power supply shown in FIG. 18 will be described below.

  The stabilized power source shown in FIG. 18 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized. In the configuration example illustrated in FIG. 18, it is assumed that the same voltage is supplied to a plurality of independent power supply lines 4-1 and 4-2 from independent power supply devices. The same voltage may be supplied to a plurality of power supply lines 4-1 and 4-2 from a single power supply device, or a plurality of power supply lines 4-1 and 4-2 are connected to a single power supply line. It may be summarized in.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. Further, since the thermistor is employed for the resistor 7-2, the voltage output from the abnormality detection resistor 7 changes according to the temperature in the vicinity of the output 16. That is, it is used for detecting a temperature abnormality.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  A switch 11 that can be turned on and off by electrical control is used. For example, a field effect transistor (FET) or a relay that can be mechanically turned on and off can be used.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power supply 4, and the output (source terminal) of the current control unit 3 is connected to the output 16 via the inductor 12, and the control input (gate terminal) of the current control unit 3 Is connected to the output of the drive circuit section 14. The input (drain terminal) of the current control unit 6 is connected to the power source 4 via the switch 11, and the output (source terminal) of the current control unit 6 is connected to the output 16 via the inductor 12. The control input (gate terminal) 6 is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel to the output 16.

  The cathode of the diode 15 is connected to the outputs (source terminals) of the current control unit 3 and the current control unit 6, and the anode of the diode 15 is connected to the ground. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is The control input of the switch 11 is connected. The switch 11 is provided to control the current drive capability of the current control unit 6 with respect to the detected temperature abnormality of the output.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the output 16 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2 and the pulse signal output from the drive circuit unit 14. Accordingly, the current control unit 3 performs on / off control of the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. .

  When the current control unit 3 is on, a current flows from the power source 4 to the output 16 via the inductor 12. Further, when the current control unit 3 is off, a current flows through the output 16 through a path passing through the diode 15 due to the electric energy accumulated in the inductor 12 so far. The waveform of the voltage appearing at the output 16 is smoothed by a low-pass filter composed of the inductor 12 and the capacitor 13. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has an abnormality according to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage (voltage corresponding to the output temperature) input from the abnormality detection resistor 7. The presence or absence is identified, and the switch 11 is on / off controlled according to the result.

  That is, when a voltage at which the output temperature is determined to be abnormal is input, the switch 11 is turned off (opened), the current of the current control unit 6 is cut off, and the current control unit 6 that controls the power supply of the output terminal 16 is controlled. Current drive capability can be limited. Further, when the voltage at which the output temperature is determined to be abnormal is not input (normal), the switch 11 is kept on and current also flows through the current control unit 6.

  Therefore, the stabilized power source shown in FIG. 18 detects the abnormality in a state where the temperature is abnormally increased due to an overcurrent flowing due to a short circuit of the output 16 or other abnormal states of the output. It is possible to limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output temperature is a certain value or more, the switch 11 can be controlled to be in an OFF state, so that a stable and quick start-up operation is possible while reducing the inrush current. It becomes.

(Nineteenth embodiment)
The configuration of the stabilized power supply according to the nineteenth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power supply shown in FIG. 19 will be described below.

  19 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, a current control unit 3, a power source 4, a diode 15, and an inductor 12. And a capacitor 13 and an output (output terminal) 16. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detection resistor 5 is composed of two resistors connected between the output 16 and the ground, and is determined by the ratio between the output voltage appearing at the output 16 and the resistance value of the two resistors. Output the compressed voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3.

  The current control unit 3 includes n FETs (field effect transistors) 3-1 to 3-n. The inputs (drain terminals) of the FETs 3-1 to 3-n are connected to the power supply 4 via the inductor 12, and the outputs (source terminals) of the FETs 3-1 to 3-n are connected to the ground. The control inputs (gate terminals) 1 to 3 -n are connected to the output of the drive circuit unit 14. That is, the n FETs 3-1 to 3-n are connected in parallel, and the same pulse signal output from the drive circuit unit 14 is commonly input to the control inputs of the n FETs 3-1 to 3-n. .

  The anode of the diode 15 is connected to the input (drain terminal) of each FET 3-1 to 3-n, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  Here, since the current control unit 3 is composed of n FETs connected in parallel, the current supplied from the output 16 to the load at the connection destination (not shown) is n in the current control unit 3. Distributed in the route. That is, the current corresponding to the load capacity is distributed and handled by the n FETs.

  Therefore, for example, when the output 16 is short-circuited and an overcurrent flows through the output 16, the current control unit 3 generates heat. However, since the amount of generated heat is distributed to n, The amount of heat borne by each FET inside the control unit 3 is relatively small. Therefore, an extreme temperature rise of the device can be suppressed.

(20th embodiment)
The configuration of the stabilized power supply according to the twentieth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 20 will be described below.

  20 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, The capacitor 13, the power supply 4, the output voltage detection resistor 5, the output (output terminal) 16, the abnormality detection resistor 7, the abnormality detection operational amplifier 8, and the gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. The abnormality detection resistor 7 is used to detect an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 6 is connected to the ground, and the control input (gate terminal) of the current control unit 6 is connected. ) Is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current controller 3 and the current controller 6, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is It is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the abnormality detection resistor 7 (voltage proportional to the output voltage). Applied to the input of the gate voltage controller 9.

  The gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6 when a voltage at which the output voltage is determined to be abnormal is input according to the value input from the operational amplifier 8. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the pulse signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output voltage, and the current driving capability relating to the feeding of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power source shown in FIG. 20 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent due to the output 16 being short-circuited or in any other abnormal state of the output voltage. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(Twenty-first embodiment)
The configuration of the stabilized power supply according to the twenty-first embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 21 will be described below.

  21 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection operational amplifier 8, and a gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detecting resistor 5 is composed of three resistors (5-1, 5-2, 5-3) connected between the output 16 and the ground. Two types of divided voltages determined by the ratio of the resistance values of the three resistors are output to the two output terminals. One of the two types of voltage is used for stabilizing the output voltage, and the other is used for detecting an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 6 is connected to the ground, and the control input (gate terminal) of the current control unit 6 is connected. ) Is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current controller 3 and the current controller 6, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the output voltage detection resistor 5 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8. Is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the output voltage detection resistor 5 (voltage proportional to the output voltage). Is applied to the input of the gate voltage control unit 9.

  The gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6 when a voltage at which the output voltage is determined to be abnormal is input according to the value input from the operational amplifier 8. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. In addition, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the pulse signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output voltage, and the current driving capability relating to the feeding of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power source shown in FIG. 21 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent due to a short circuit of the output 16 or other abnormal output voltage. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(Twenty-second embodiment)
The configuration of the stabilized power supply according to the twenty-second embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 22 will be described below.

  22 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, The capacitor 13, the power supply 4, the output voltage detection resistor 5, the output (output terminal) 16, the current detection unit 10, the abnormality detection operational amplifier 8, and the gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The current detection unit 10 detects a current flowing through the load from the output 16 and outputs a voltage representing the magnitude of the current. The current detection unit 10 is used for detecting an abnormal excessive current.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 6 is connected to the ground, and the control input (gate terminal) of the current control unit 6 is connected. ) Is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current control unit 3 and the current control unit 6, and the cathode of the diode 15 is connected to the output 16 via the current detection unit 10. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the current detection unit 10 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is a gate. It is connected to the input of the voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected abnormality of the output voltage.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 gates a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the current detection unit 10 (voltage proportional to the output current). Applied to the input of the voltage controller 9.

  When a voltage at which the output current is determined to be abnormal is input according to the value input from the operational amplifier 8, the gate voltage control unit 9 supplies a voltage for turning off the current control unit 6 to the gate terminal of the current control unit 6. The current drive capability of the current control unit 6 that controls the power supply to the output terminal 16 can be limited. When the voltage at which the output current is determined to be abnormal is not input (normal), the pulse signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted in accordance with the degree of abnormality of the output voltage, and the current driving capability relating to the feeding of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power supply shown in FIG. 22 detects an abnormality in a state where the output voltage decreases due to an overcurrent flowing due to a short circuit of the output 16 or other abnormal state, and drives the output current. It is possible to limit the ability. In addition, when the stabilized power supply is turned on, if the output current is a certain value or more, the current control unit 6 can be cut off or set in a semi-conducting state. Quick start-up operation is possible.

(Twenty-third embodiment)
The configuration of a stabilized power supply according to the twenty-third embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power supply shown in FIG. 23 will be described below.

  23 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, The capacitor 13, the power supply 4, the output voltage detection resistor 5, the output (output terminal) 16, the abnormality detection resistor 7, the abnormality detection operational amplifier 8, and the gate voltage control unit 9 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. Further, a thermistor is adopted as the resistor 7-2. Therefore, the voltage output from the abnormality detection resistor 7 represents the temperature in the vicinity of the output 16.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to the control input of the current control unit 3 and the input of the gate voltage control unit 9.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 6 is connected to the ground, and the control input (gate terminal) of the current control unit 6 is connected. ) Is connected to the output of the gate voltage control unit 9. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current controller 3 and the current controller 6, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is It is connected to the input of the gate voltage control unit 9. The gate voltage control unit 9 is provided to control the current drive capability of the current control unit 6 with respect to the detected temperature abnormality of the output.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 can be applied as a gate voltage to the FET of the current control unit 6 via the gate voltage control unit 9, the current control unit 3 and the current control unit 6 Both can be used to drive the output.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has a voltage value corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage (voltage corresponding to the output temperature) input from the abnormality detection resistor 7. Is applied to the input of the gate voltage control unit 9.

  When a voltage at which the output temperature is determined to be abnormal is input in accordance with the value input from the operational amplifier 8, the gate voltage control unit 9 sets the voltage for turning off the current control unit 6 to the gate of the current control unit 6. It is possible to limit the current driving capability of the current control unit 6 that is applied to the terminal and controls the power supply of the output terminal 16. When the voltage at which the output temperature is determined to be abnormal is not input (normal), the pulse signal output from the drive circuit unit 14 is applied to the gate terminal of the current control unit 6 as it is.

  The operation of the gate voltage control unit 9 is controlled so as to give the result of weighting the control signal output from the operational amplifier 2 to the input of the current control unit 6 according to the value input from the operational amplifier 8. Also good. Thereby, the gate voltage of the current control unit 6 can be adjusted according to the degree of temperature abnormality of the output, and the current driving capability relating to the power supply of the output terminal 16 can be flexibly limited.

  Therefore, the stabilized power supply shown in FIG. 23 detects the abnormality in a state where the output temperature rises abnormally due to an output 16 short circuit or the like, or in other abnormal states. It is possible to limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output temperature is a certain value or more, the current control unit 6 can be cut off or made into a semi-conducting state, so that it is stable while reducing inrush current. Quick start-up operation is possible.

(24th Embodiment)
The configuration of the stabilized power supply according to the twenty-fourth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power supply shown in FIG. 24 will be described below.

  The stabilized power source shown in FIG. 24 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. The abnormality detection resistor 7 is used to detect an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power supply 4 via the switch 11 and the inductor 12, and the output (source terminal) of the current control unit 6 is connected to the ground, and the control input of the current control unit 6 (Gate terminal) is connected to the output of the drive circuit section 14. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current controller 3 and the current controller 6, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  A switch 11 that can be turned on and off by electrical control is used. For example, an FET (field effect transistor) or a relay capable of turning on and off a mechanical contact can be used as the switch 11.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is The control input of the switch 11 is connected. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output voltage abnormality.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is also applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. it can.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has an output voltage corresponding to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the abnormality detection resistor 7 (a voltage proportional to the output voltage). The presence or absence of abnormality is identified, and the on / off of the switch 11 is controlled according to the identification result.

  That is, when a voltage that determines that the output voltage is abnormal is input, the switch 11 is turned off to cut off the current of the current control unit 6, and the current of the current control unit 6 that controls the feeding of the output terminal 16. Drive capability can be limited. Further, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the switch 11 is kept on, so that the current control unit 6 is turned on / off according to the pulse signal output from the drive circuit unit 14. The output current is controlled together with the current control unit 3.

  Therefore, the stabilized power source shown in FIG. 24 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent due to the output 16 being short-circuited, or in other abnormal states of the output voltage. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(25th embodiment)
The configuration of the stabilized power supply according to the twenty-fifth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power supply shown in FIG. 25 will be described below.

  25 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detecting resistor 5 is composed of three resistors (5-1, 5-2, 5-3) connected between the output 16 and the ground. Two types of divided voltages determined by the ratio of the resistance values of the three resistors are output to the two output terminals. One of the two types of voltage is used for stabilizing the output voltage, and the other is used for detecting an abnormal voltage.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power supply 4 via the switch 11 and the inductor 12, and the output (source terminal) of the current control unit 6 is connected to the ground, and the control input of the current control unit 6 (Gate terminal) is connected to the output of the drive circuit section 14. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current controller 3 and the current controller 6, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  A switch 11 that can be turned on and off by electrical control is used. For example, an FET (field effect transistor) or a relay capable of turning on and off a mechanical contact can be used as the switch 11.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the output voltage detection resistor 5 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8. Is connected to the control input of the switch 11. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output voltage abnormality.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is also applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. it can.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 is in accordance with a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage (voltage for detecting output voltage abnormality) input from the output voltage detection resistor 5. The presence or absence of an abnormality in the output voltage is identified, and on / off of the switch 11 is controlled according to the identification result.

  That is, when a voltage that determines that the output voltage is abnormal is input, the switch 11 is turned off to cut off the current of the current control unit 6, and the current of the current control unit 6 that controls the feeding of the output terminal 16. Drive capability can be limited. Further, when the voltage at which the output voltage is determined to be abnormal is not input (normal), the switch 11 is kept on, so that the current control unit 6 is turned on / off according to the pulse signal output from the drive circuit unit 14. The output current is controlled together with the current control unit 3.

  Therefore, the stabilized power supply shown in FIG. 25 can detect abnormal output voltage in a state where the output voltage decreases due to an overcurrent due to a short circuit of the output 16 or other abnormal output voltage. It is possible to detect and limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output voltage is below a certain value, the current control unit 6 can be cut off or made into a semi-conductive state, so that the inrush current can be reduced and stable. Quick start-up operation is possible.

(Twenty-sixth embodiment)
The configuration of the stabilized power supply according to the twenty-sixth embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 26 will be described below.

  26 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, a current detection unit 10, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The current detection unit 10 detects a current flowing through the load from the output 16 and outputs a voltage representing the magnitude of the current. The current detection unit 10 is used for detection of an excessive output current.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power supply 4 via the switch 11 and the inductor 12, and the output (source terminal) of the current control unit 6 is connected to the ground, and the control input of the current control unit 6 (Gate terminal) is connected to the output of the drive circuit section 14. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current controller 3 and the current controller 6, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  A switch 11 that can be turned on and off by electrical control is used. For example, an FET (field effect transistor) or a relay capable of turning on and off a mechanical contact can be used as the switch 11.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the current detection unit 10 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is a switch. 11 control inputs. The switch 11 is provided to control the current drive capability of the current control unit 6 in response to the detected output current abnormality.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is also applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. it can.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 has an output current abnormality according to a difference between a constant reference voltage input from the reference power supply 1 and a detection voltage input from the current detection unit 10 (voltage proportional to the output current). The switch 11 is turned on / off according to the identification result.

  In other words, when a voltage that determines that the output current is abnormal (excessive) is input, the switch 11 is turned off to cut off the current of the current control unit 6 and control the power supply to the output terminal 16. 6 current driving capability can be limited. Further, when the voltage at which the output current is determined to be abnormal is not input (normal), the switch 11 is kept on, so that the current control unit 6 is turned on / off according to the pulse signal output from the drive circuit unit 14. The output current is controlled together with the current control unit 3.

  Therefore, the stabilized power supply shown in FIG. 26 detects the abnormality in a state where the output voltage decreases due to an overcurrent caused by the output 16 being short-circuited, or in other abnormal states of the output current. It is possible to limit the drive capability of the output current. In addition, when the stabilized power supply is turned on, if the output current is a certain value or more, the current control unit 6 can be cut off, so that a stable and quick start-up operation can be performed while reducing the inrush current. .

(Twenty-seventh embodiment)
The configuration of a stabilized power supply according to the twenty-seventh embodiment of the present invention is shown in FIG. The configuration and operation of the stabilized power source shown in FIG. 27 will be described below.

  27 includes a reference power source (reference voltage source) 1, an operational amplifier (operational amplifier) 2, a drive circuit unit 14, current control units 3 and 6, a diode 15, an inductor 12, A capacitor 13, a power supply 4, an output voltage detection resistor 5, an output (output terminal) 16, an abnormality detection resistor 7, an abnormality detection operational amplifier 8, and a switch 11 are provided. A predetermined load can be connected to the output 16.

  The power source 4 is a power supply source that outputs a DC voltage that is not stabilized.

  The output voltage detection resistor 5 includes two resistors (5-1, 5-2) connected between the output 16 and the ground. The output voltage appearing at the output 16 and the two resistors are included. The divided voltage determined by the ratio of the resistance values of is output.

  The abnormality detection resistor 7 is also composed of two resistors (7-1, 7-2) connected between the output 16 and the ground, and the output voltage appearing at the output 16 and the two resistors are connected to each other. A divided voltage determined by the ratio of resistance values is output. Further, since the thermistor is employed for the resistor 7-2, the voltage output from the abnormality detecting resistor 7 changes according to the temperature in the vicinity of the output 16. That is, the abnormality detection resistor 7 is used to detect a temperature abnormality.

  The reference power supply 1 is connected to one input terminal of the operational amplifier 2, the output of the output voltage detection resistor 5 is connected to the other input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the input of the drive circuit unit 14. Has been.

  The drive circuit unit 14 generates a pulse signal for performing on / off control of the current control unit 3. Further, the duty of the pulse signal to be generated is adjusted according to the signal input from the operational amplifier 2. The pulse signal generated by the drive circuit unit 14 is applied to control inputs of the current control unit 3 and the current control unit 6.

  Each of the current control units 3 and 6 is composed of an FET (field effect transistor). The input (drain terminal) of the current control unit 3 is connected to the power source 4 via the inductor 12, the output (source terminal) of the current control unit 3 is connected to the ground, and the control input (gate terminal) of the current control unit 3 is The output of the drive circuit unit 14 is connected. The input (drain terminal) of the current control unit 6 is connected to the power supply 4 via the switch 11 and the inductor 12, and the output (source terminal) of the current control unit 6 is connected to the ground, and the control input of the current control unit 6 (Gate terminal) is connected to the output of the drive circuit section 14. That is, the two current control units 3 and 6 are connected in parallel.

  The anode of the diode 15 is connected to the inputs (drain terminals) of the current controller 3 and the current controller 6, and the cathode of the diode 15 is connected to the output 16. This diode 15 is used as a rectifier. Here, a power source of a so-called synchronous rectification type DCDC converter in which the diode 15 is a control element (eg, FET (field effect transistor)) and is turned on and off in a phase opposite to each of the FETs 3-1 to 3-n controlled by the drive circuit 14. A device may be used. The capacitor 13 connected to the output 16 forms a low-pass filter together with the inductor 12.

  A switch 11 that can be turned on and off by electrical control is used. For example, an FET (field effect transistor) or a relay capable of turning on and off a mechanical contact can be used as the switch 11.

  The reference power supply 1 is connected to one input terminal of the abnormality detection operational amplifier 8, the output of the abnormality detection resistor 7 is connected to the other input terminal of the abnormality detection operational amplifier 8, and the output terminal of the abnormality detection operational amplifier 8 is The control input of the switch 11 is connected. The switch 11 is provided to control the current drive capability of the current control unit 6 with respect to the detected temperature abnormality of the output.

  The current control unit 3 periodically on / off controls the current flowing from the power source 4 to the inductor 12 according to the pulse signal output from the drive circuit unit 14. The level of the output voltage appearing at the output 16 is fed back to the input of the operational amplifier 2 by the output voltage detection resistor 5 and affects the control signal output from the operational amplifier 2. Therefore, the current control unit 3 turns on and off the current flowing therethrough so that the output voltage appearing at the output 16 is maintained constant. The output voltage appearing at the output 16 can be adjusted by changing the voltage dividing ratio of the output voltage detecting resistor 5. Further, since the pulse signal output from the drive circuit unit 14 is also applied as a gate voltage to the FET of the current control unit 6, the output can be driven using both the current control unit 3 and the current control unit 6. it can.

  When the current control unit 3 is on, the current flowing from the power source 4 to the inductor 12 flows to the ground through the current control unit 3. Due to this current, electrical energy is stored in the inductor 12. At this time, the diode 15 is off, and power is supplied from the capacitor 13 to the output terminal 16. When the current control unit 3 is off, energy obtained by adding the output of the power source 4 and the electric energy accumulated in the inductor 12 so far is supplied to the output terminal 16 via the diode 15. Further, the output waveform of the inductor 12 is rectified and smoothed by the diode 15 and the capacitor 13, and a constant voltage is output to the output terminal 16. The voltage appearing at the output 16 is stabilized by the duty control of the pulse signal output from the drive circuit unit 14 and becomes a constant voltage.

  On the other hand, the abnormality detection operational amplifier 8 outputs the temperature of the output in accordance with the difference between the constant reference voltage input from the reference power supply 1 and the detection voltage (voltage representing the output temperature) input from the abnormality detection resistor 7. The presence or absence of abnormality is identified, and the on / off of the switch 11 is controlled according to the identification result.

  That is, when a voltage for which the output temperature is determined to be abnormally high is input, the switch 11 is turned off to cut off the current of the current control unit 6 and control the power supply to the output terminal 16. 6 current driving capability can be limited. When the voltage at which the output temperature is determined to be abnormal is not input (normal), the switch 11 is kept on, so that the current control unit 6 follows the pulse signal output from the drive circuit unit 14. The output current is controlled together with the current control unit 3.

  Therefore, the stabilized power source shown in FIG. 27 detects the abnormality in a state where the output temperature rises abnormally due to an output 16 short circuit or the like, or in other abnormal states. It is possible to limit the drive capability of the output current. Further, when the stabilized power supply is turned on, if the output temperature is a certain value or more, the current control unit 6 can be cut off, so that a stable and quick start-up operation can be performed while reducing the inrush current. Become.

  Furthermore, in recent years, the stabilized power source described from the first embodiment to the twenty-seventh embodiment has become increasingly multifunctional, the number of power sources increases with the addition of functions, and the control of each power source has become complicated. A portable terminal that can be started up stably and quickly even if it is frequently turned on and off to save power by being mounted on a portable terminal (represented by a mobile phone, for example). Can be realized. In addition, such a portable terminal can stably and quickly start up individual power supplies even when the power is turned on.

  Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

  As described above, the present invention suppresses heat generation by dispersing heat generation in a state where an overcurrent flows due to an output short-circuiting, or in other voltage abnormal state, current abnormal state, or temperature abnormal state. In addition, it has the effect of being a stable power supply with high safety by limiting the output current capability.In addition, at startup, a large current flows due to an inrush current, resulting in an abnormal voltage state and current. In the case of an abnormal state or temperature abnormal state, one of the FETs is turned off or in a semi-conducting state, thereby having an effect that a stable and quick start-up operation is possible. It is possible to protect an electronic device by detecting an overcurrent, an output voltage abnormality and a temperature abnormality due to an abnormality or the like, and is useful as a power source capable of stable and quick startup operation.

1 is an electric circuit diagram illustrating a configuration of a stabilized power supply circuit according to a first embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 2nd Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 3rd Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 4th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 5th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 6th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 7th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 8th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 9th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 10th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 11th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 12th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 13th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 14th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 15th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 16th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 17th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 18th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 19th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 20th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 21st Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 22nd Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 23rd Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 24th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 25th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 26th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit in 27th Embodiment. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit of a prior art example. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit of a prior art example. It is an electric circuit diagram which shows the structure of the stabilized power supply circuit of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reference power supply 2 Operational amplifier 3 Current control part 4 Power supply 5 Output voltage detection resistance 6 Current control part 7 Abnormality detection resistance 8 Abnormality detection operational amplifier 9 Gate voltage control part 10 Current detection part 11 Switch 12 Inductor 13 Capacitor 14 Drive circuit part 15 Diode 16 output

Claims (28)

A reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected, a power source that supplies DC power, and the output terminal are connected. A current control unit, and a control voltage generation unit that applies a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit. A stabilized power supply circuit,
A plurality of control elements connected in parallel with each other to the output terminal are provided in the current control unit, and one control output from the control voltage generation unit for each control input of the plurality of control elements A stabilized power supply circuit characterized by applying a common voltage. A reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected, a power source that supplies DC power, and the output terminal are connected. A current control unit, and a control voltage generation unit that applies a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit. A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel with each other with respect to the output terminal, and the control voltage output from the control voltage generation unit is supplied to the first control element. And at least one of the second control elements,
An abnormal voltage detector that detects an abnormal voltage based on a voltage appearing at the output terminal and a reference voltage output by the reference voltage source;
Stabilization characterized by comprising: an abnormal voltage control unit that controls the drive capability of at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit Power supply circuit.   3. The stabilized power supply circuit according to claim 2, wherein the voltage detection unit and the abnormal voltage detection unit are configured using two independent resistance voltage dividing circuits or one resistance voltage dividing circuit having a plurality of outputs. A stabilized power supply circuit characterized by the above. A reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected, a power source that supplies DC power, and the output terminal are connected. A current control unit, and a control voltage generation unit that applies a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit. A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel with each other with respect to the output terminal, and the control voltage output from the control voltage generation unit is supplied to the first control element. And at least one of the second control elements,
A current detector that outputs a signal proportional to the magnitude of the current flowing through the output terminal;
An abnormal current detector that detects an abnormal current based on a current signal output by the current detector and a reference voltage output by the reference voltage source;
Stabilization characterized by comprising: an abnormal current control unit that controls the drive capability of at least one of the first control element and the second control element based on the abnormal current detected by the abnormal current detection unit Power supply circuit. A reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected, a power source that supplies DC power, and the output terminal are connected. A current control unit, and a control voltage generation unit that applies a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit. A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel with each other with respect to the output terminal, and the control voltage output from the control voltage generation unit is supplied to the first control element. And at least one of the second control elements,
Based on the voltage appearing at the output terminal and the reference voltage output by the reference voltage source, a temperature abnormality detection unit that detects a temperature abnormality at or near the position of the output terminal;
And a temperature abnormality control unit that controls at least one of the first control element and the second control element based on an abnormality signal detected by the temperature abnormality detection unit. Power supply circuit. A reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected, a power source that supplies DC power, and the output terminal are connected. A current control unit, and a control voltage generation unit that applies a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit. A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel with each other with respect to the output terminal, and the control voltage output from the control voltage generation unit is supplied to the first control element. And a common application to both the second control element,
A controllable switch connected in series with one of the first control element and the second control element;
An abnormal voltage detector that detects the presence or absence of an abnormal voltage based on the voltage that appears at the output terminal and the reference voltage that is output from the reference voltage source, and that controls on / off of the switch according to the presence or absence of the abnormal voltage is provided. Stabilized power supply circuit.   7. The stabilized power supply circuit according to claim 6, wherein the voltage detection unit and the abnormal voltage detection unit are configured by using two resistance voltage dividing circuits independent of each other or one resistance voltage dividing circuit having a plurality of outputs. A stabilized power supply circuit characterized by the above. A reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected, a power source that supplies DC power, and the output terminal are connected. A current control unit, and a control voltage generation unit that applies a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit. A stabilized power circuit,
The current control unit is provided with a first control element and a second control element connected in parallel with each other with respect to the output terminal, and the control voltage output from the control voltage generation unit is supplied to the first control element. And a common application to both the second control element,
A controllable switch connected in series with one of the first control element and the second control element;
An abnormal current detector that detects the presence or absence of an abnormal current based on a signal proportional to the current flowing through the output terminal and a reference voltage output from the reference voltage source, and controls on / off of the switch according to the presence or absence of the abnormal current; A stabilized power supply circuit characterized by comprising: A reference voltage source that outputs a specified voltage, a voltage detector that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected, a power source that supplies DC power, and the output terminal are connected. A current control unit, and a control voltage generation unit that applies a control voltage according to a difference between a reference voltage output from the reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit. A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel with each other with respect to the output terminal, and the control voltage output from the control voltage generation unit is supplied to the first control element. And a common application to both the second control element,
A controllable switch connected in series with one of the first control element and the second control element;
Based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source, the position of the output terminal or the presence or absence of a temperature abnormality in the vicinity thereof is detected, and the switch is turned on / off according to the presence or absence of the temperature abnormality A temperature abnormality detection unit that
A stabilized power supply circuit characterized by comprising: A reference voltage source for outputting a specified voltage, a voltage detection unit for detecting a voltage proportional to a voltage appearing at an output terminal to which a load is connected, and a current control unit connected to an output of a power source for supplying DC power An inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, a capacitor connected to the output terminal, and the reference voltage source And a control signal generator that provides a control signal of the current controller with a pulse signal that changes according to a control voltage according to a difference between a reference voltage to be detected and a detection voltage output from the voltage detector. There,
A plurality of control elements connected in parallel to the inductor are provided in the current control unit, and one pulse signal output from the control signal generation unit for each control input of the plurality of control elements A stable power supply circuit characterized by providing the same. A reference voltage source for outputting a specified voltage, a voltage detection unit for detecting a voltage proportional to a voltage appearing at an output terminal to which a load is connected, and a current control unit connected to an output of a power source for supplying DC power An inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, a capacitor connected to the output terminal, and the reference voltage source And a control signal generator that provides a control signal of the current controller with a pulse signal that changes according to a control voltage according to a difference between a reference voltage to be detected and a detection voltage output from the voltage detector. There,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
An abnormal voltage detector that detects an abnormal voltage based on a voltage appearing at the output terminal and a reference voltage output by the reference voltage source;
Stabilization characterized by comprising: an abnormal voltage control unit that controls the drive capability of at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit Power supply circuit.   12. The stabilized power supply circuit according to claim 11, wherein the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other or one resistance voltage dividing circuit having a plurality of outputs. A stabilized power supply circuit characterized by the above. A reference voltage source for outputting a specified voltage, a voltage detection unit for detecting a voltage proportional to a voltage appearing at an output terminal to which a load is connected, and a current control unit connected to an output of a power source for supplying DC power An inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, a capacitor connected to the output terminal, and the reference voltage source And a control signal generator that provides a control signal of the current controller with a pulse signal that changes according to a control voltage according to a difference between a reference voltage to be detected and a detection voltage output from the voltage detector. There,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
An abnormal current detector that detects the presence or absence of an abnormal current based on the current flowing through the inductor and the reference voltage output by the reference voltage source;
An abnormal current control unit that controls at least one of the first control element and the second control element according to the presence or absence of the abnormal current detected by the abnormal current detection unit is provided. Stabilized power circuit. A reference voltage source for outputting a specified voltage, a voltage detection unit for detecting a voltage proportional to a voltage appearing at an output terminal to which a load is connected, and a current control unit connected to an output of a power source for supplying DC power An inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, a capacitor connected to the output terminal, and the reference voltage source And a control signal generator that provides a control signal of the current controller with a pulse signal that changes according to a control voltage according to a difference between a reference voltage to be detected and a detection voltage output from the voltage detector. There,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
Based on the voltage appearing at the output terminal and the reference voltage output by the reference voltage source, a temperature abnormality detection unit that detects a temperature abnormality at or near the position of the output terminal;
And a temperature abnormality control unit that controls at least one of the first control element and the second control element based on an abnormality signal detected by the temperature abnormality detection unit. Power supply circuit. A reference voltage source for outputting a specified voltage, a voltage detection unit for detecting a voltage proportional to a voltage appearing at an output terminal to which a load is connected, and a current control unit connected to an output of a power source for supplying DC power An inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, a capacitor connected to the output terminal, and the reference voltage source And a control signal generator that provides a control signal of the current controller with a pulse signal that changes according to a control voltage according to a difference between a reference voltage to be detected and a detection voltage output from the voltage detector. There,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
A controllable switch connected in series with one of the first control element and the second control element;
An abnormal voltage detector that detects the presence or absence of an abnormal voltage based on the voltage that appears at the output terminal and the reference voltage that is output from the reference voltage source, and that controls on / off of the switch according to the presence or absence of the abnormal voltage is provided. Stabilized power supply circuit.   16. The stabilized power supply circuit according to claim 15, wherein the voltage detection unit and the abnormal voltage detection unit are configured using two independent resistance voltage dividing circuits or one resistance voltage dividing circuit having a plurality of outputs. A stabilized power supply circuit characterized by the above. A reference voltage source for outputting a specified voltage, a voltage detection unit for detecting a voltage proportional to a voltage appearing at an output terminal to which a load is connected, and a current control unit connected to an output of a power source for supplying DC power An inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, a capacitor connected to the output terminal, and the reference voltage source And a control signal generator that provides a control signal of the current controller with a pulse signal that changes according to a control voltage according to a difference between a reference voltage to be detected and a detection voltage output from the voltage detector. There,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
A controllable switch connected in series with one of the first control element and the second control element;
An abnormal current detector configured to detect presence / absence of an abnormal current based on a current flowing through the inductor and a reference voltage output from the reference voltage source, and to turn on / off the switch according to the presence / absence of the abnormal current; Stabilized power supply circuit. A reference voltage source for outputting a specified voltage, a voltage detection unit for detecting a voltage proportional to a voltage appearing at an output terminal to which a load is connected, and a current control unit connected to an output of a power source for supplying DC power An inductor connected between the output of the current control unit and the output terminal, a rectifier connected to the output of the current control unit, a capacitor connected to the output terminal, and the reference voltage source And a control signal generator that provides a control signal of the current controller with a pulse signal that changes according to a control voltage according to a difference between a reference voltage to be detected and a detection voltage output from the voltage detector. There,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
A controllable switch connected in series with one of the first control element and the second control element;
Based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source, a temperature at which the position of the output terminal is detected or its vicinity is detected, and the switch is turned on / off according to the presence or absence of the temperature abnormality A stabilized power supply circuit comprising an abnormality detection unit. A reference voltage source that outputs a specified voltage; a voltage detection unit that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected; an inductor that has one end connected to the output of a power source that supplies DC power; A current control unit connected between the other end of the inductor and the ground; a rectifier connected between the other end of the inductor and the output terminal; a capacitor connected to the output terminal; A control signal generating unit that applies a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from a reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit; A stabilized power supply circuit,
A plurality of control elements connected in parallel to the inductor are provided in the current control unit, and one pulse signal output from the control signal generation unit for each control input of the plurality of control elements A stable power supply circuit characterized by providing the same. A reference voltage source that outputs a specified voltage, a voltage detection unit that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, an inductor that has one end connected to the output of a power source that supplies DC power, and A current control unit connected between the other end of the inductor and the ground; a rectifier connected between the other end of the inductor and the output terminal; a capacitor connected to the output terminal; A control signal generating unit that applies a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from a reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit; A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
An abnormal voltage detector that detects an abnormal voltage based on a voltage appearing at the output terminal and a reference voltage output by the reference voltage source;
Stabilization characterized by comprising: an abnormal voltage control unit that controls the drive capability of at least one of the first control element and the second control element based on the abnormal voltage detected by the abnormal voltage detection unit Power supply circuit.   21. The stabilized power supply circuit according to claim 20, wherein the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other or one resistance voltage dividing circuit having a plurality of outputs. A stabilized power supply circuit characterized by that. A reference voltage source that outputs a specified voltage; a voltage detection unit that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected; an inductor that has one end connected to the output of a power source that supplies DC power; A current control unit connected between the other end of the inductor and the ground; a rectifier connected between the other end of the inductor and the output terminal; a capacitor connected to the output terminal; A control signal generating unit that applies a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from a reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit; A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
An abnormal current detector that detects the presence or absence of an abnormal current based on a current flowing through the rectifier and a reference voltage output by the reference voltage source;
An abnormal current control unit that controls at least one of the first control element and the second control element according to the presence or absence of the abnormal current detected by the abnormal current detection unit is provided. Stabilized power circuit. A reference voltage source that outputs a specified voltage; a voltage detection unit that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected; an inductor that has one end connected to the output of a power source that supplies DC power; A current control unit connected between the other end of the inductor and the ground; a rectifier connected between the other end of the inductor and the output terminal; a capacitor connected to the output terminal; A control signal generating unit that applies a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from a reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit; A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
Based on the voltage appearing at the output terminal and the reference voltage output by the reference voltage source, a temperature abnormality detection unit that detects a temperature abnormality at or near the position of the output terminal;
And a temperature abnormality control unit that controls at least one of the first control element and the second control element based on an abnormality signal detected by the temperature abnormality detection unit. Power supply circuit. A reference voltage source that outputs a specified voltage; a voltage detection unit that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected; an inductor that has one end connected to the output of a power source that supplies DC power; A current control unit connected between the other end of the inductor and the ground; a rectifier connected between the other end of the inductor and the output terminal; a capacitor connected to the output terminal; A control signal generating unit that applies a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from a reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit; A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
A controllable switch connected in series with one of the first control element and the second control element;
An abnormal voltage detector that detects the presence or absence of an abnormal voltage based on the voltage that appears at the output terminal and the reference voltage that is output from the reference voltage source, and that controls on / off of the switch according to the presence or absence of the abnormal voltage is provided. Stabilized power supply circuit.   25. The stabilized power supply circuit according to claim 24, wherein the voltage detection unit and the abnormal voltage detection unit are configured using two resistance voltage dividing circuits independent of each other, or one resistance voltage dividing circuit having a plurality of outputs. A stabilized power supply circuit characterized by that. A reference voltage source that outputs a specified voltage; a voltage detection unit that detects a voltage proportional to a voltage appearing at an output terminal to which a load is connected; an inductor that has one end connected to the output of a power source that supplies DC power; A current control unit connected between the other end of the inductor and the ground; a rectifier connected between the other end of the inductor and the output terminal; a capacitor connected to the output terminal; A control signal generating unit that applies a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from a reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit; A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
A controllable switch connected in series with one of the first control element and the second control element;
An abnormal current detection unit is provided that detects the presence or absence of an abnormal current based on a current flowing through the rectifier and a reference voltage output from the reference voltage source, and controls the switch on and off according to the presence or absence of the abnormal current. Stabilized power supply circuit. A reference voltage source that outputs a specified voltage, a voltage detection unit that detects a voltage proportional to a voltage that appears at an output terminal to which a load is connected, an inductor that has one end connected to the output of a power source that supplies DC power, and A current control unit connected between the other end of the inductor and the ground; a rectifier connected between the other end of the inductor and the output terminal; a capacitor connected to the output terminal; A control signal generating unit that applies a pulse signal that changes according to a control voltage according to a difference between a reference voltage output from a reference voltage source and a detection voltage output from the voltage detection unit to a control input of the current control unit; A stabilized power supply circuit,
The current control unit is provided with a first control element and a second control element connected in parallel to each other with respect to the inductor, and a pulse signal output from the control signal generation unit is transmitted to the first control element and Applying to at least one of the second control elements;
A controllable switch connected in series with one of the first control element and the second control element;
Based on the voltage appearing at the output terminal and the reference voltage output from the reference voltage source, a temperature at which the position of the output terminal is detected or its vicinity is detected, and the switch is turned on / off according to the presence or absence of the temperature abnormality A stabilized power supply circuit comprising an abnormality detection unit.   A mobile terminal comprising the stabilized power supply circuit according to any one of claims 1 to 27.

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