WO2005078910A1 - スイッチング電源装置及び携帯機器 - Google Patents
スイッチング電源装置及び携帯機器 Download PDFInfo
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- WO2005078910A1 WO2005078910A1 PCT/JP2005/000637 JP2005000637W WO2005078910A1 WO 2005078910 A1 WO2005078910 A1 WO 2005078910A1 JP 2005000637 W JP2005000637 W JP 2005000637W WO 2005078910 A1 WO2005078910 A1 WO 2005078910A1
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- voltage
- power supply
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- comparator
- switching power
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a switching power supply that improves efficiency by reducing loss under light load, and particularly employs a current mode that performs switching control by detecting a coil current on the output side.
- the present invention relates to a switching power supply device and a portable device including the switching power supply device and having reduced power consumption.
- the switching power supply device that performs the intermittent control includes a comparator that compares a voltage corresponding to the output voltage with a reference voltage Vburst for intermittent control.
- this comparator when it is confirmed that the voltage corresponding to the output voltage becomes higher than the reference voltage Vburs due to a light load, the switching control operation of the switching element by the driver is stopped. Thereafter, when it is confirmed that the output voltage has been lowered by providing the comparator with the hysteresis characteristic, the switching control operation of the switching element by the driver is restarted. By repeating such an operation at a light load, intermittent control by the intermittent control comparator is performed, and the efficiency can be increased.
- Patent Document 1 JP-A-6-303766
- the conventional switching power supply device needs to provide a comparator for intermittent control for intermittently performing the switching operation of the switching element by the driver. There is. In this way, as long as the comparator for intermittent control is provided, In addition to increasing the circuit scale of the switching power supply, it hinders miniaturization of a portable device in which such a switching power supply is installed.
- an object of the present invention is to provide a switching power supply device that can maintain high efficiency without newly providing a circuit for intermittent control under a light load. .
- a switching power supply device of the present invention includes a switching element that performs ONZOFF operation, a control circuit that performs ONZOFF control of the switching element, and an amount of current flowing through the switching element.
- a coil connected to the coil and performing a rectifying operation together with the coil; and an oscillator for outputting an oscillation signal for controlling the switching element to be ON at a predetermined cycle to the control circuit.
- a current detection unit that detects a current value flowing through the coil, converts the current value into a voltage value, and outputs the voltage value as a current detection voltage in a switching power supply device that outputs an output voltage from a connection node between the capacitor and the coil
- a voltage source for providing an offset voltage to the current detection voltage from the current detection unit
- a comparator that compares the current detection voltage to which the offset voltage has been applied and a voltage corresponding to a difference between a voltage corresponding to the output voltage and a reference voltage, wherein the offset voltage is equal to the offset voltage.
- the comparator by applying an offset voltage to the current detection voltage representing the value of the current flowing through the detected coil, the comparator can be used at no load or light load when the difference between the output voltage and the reference voltage becomes small. However, it is confirmed that the magnitude of the current detection voltage is larger than the difference between the output voltage and the reference voltage. At this time, since the oscillation signal of the oscillator that turns on the switching element can be invalidated, the switching operation of the switching element can be intermittently controlled until the difference between the output voltage and the reference voltage becomes large. Therefore, as before, Since there is no need to add a comparator for intermittent control, it is possible to maintain high efficiency at light load or no load and to reduce the size of the device.
- FIG. 1 is a block diagram showing an internal configuration of a switching power supply device according to a first embodiment.
- FIG. 2 is a timing chart illustrating the operation of each unit when the switching power supply device of FIG. 1 is under heavy load.
- FIG. 3 is a timing chart illustrating the operation of each unit when the switching power supply device of FIG. 1 is under light load or no load.
- FIG. 4 is a circuit diagram showing an example of a configuration around a current detection circuit in the switching power supply device of FIG. 1.
- FIG. 5 is a block diagram showing an internal configuration of a switching power supply according to a second embodiment.
- FIG. 6 is a timing chart illustrating the operation of each unit when the switching power supply device of FIG. 5 is under heavy load.
- FIG. 7 is a timing chart illustrating the operation of each unit when the switching power supply device of FIG. 5 is under light load or no load.
- FIG. 8 is a circuit diagram showing an example of a configuration around a current detection circuit in the switching power supply device of FIG.
- FIG. 9 is a block diagram showing an internal configuration of a switching power supply device according to a third embodiment.
- FIG. 10 is a timing chart illustrating the operation of each unit when the switching power supply device of FIG. 9 is under heavy load.
- FIG. 11 is a timing chart illustrating the operation of each unit when the switching power supply device of FIG. 9 is under light load or no load.
- FIG. 12 is a circuit diagram showing an example of a configuration around a current detection circuit in the switching power supply device of FIG.
- FIG. 13A is a profile showing an example of a configuration when applied to a step-up switching power supply.
- FIG. 13B is a block diagram showing an example of a configuration when applied to an inverting type switching power supply device.
- Trl Tr2 MOS transistor
- FIG. 1 is a block diagram showing the internal configuration of the switching power supply device of the present embodiment.
- a signal is supplied to the p-channel MOS transistor Trl and the n-channel MOS transistor Tr2 whose power supply potential and ground potential are applied to the source, respectively, and the gates of the MOS transistors Trl and Tr2.
- a driver 1 for ONZOFF control a coil L having one end connected to the connection node of the drain of each of the MOS transistors Trl and Tr2, and a capacitor C having one end connected to the other end of the coil L and the other end grounded.
- resistors R1 and R2 connected in series between the connection node of coil L and capacitor C and the ground potential, and the voltage appearing at the connection node between coil L and capacitor C divided by resistors R1 and R2.
- Amplifier 2 a level shifter 3 for level shifting the output voltage from error amplifier 2, a voltage from level shifter 3 and coil L
- a comparator 4 for comparing the output of the comparator 4 with a voltage representing an output current
- an RS flip-flop 5 in which the output of the comparator 4 is input to a reset terminal
- an oscillator 6 for inputting a signal to a set terminal of the RS flip-flop 5, Is provided.
- the driver 1 and the RS flip-flop 5 constitute the control circuit 7, and the voltage source 20 that applies the offset voltage Voff (for example, 30 mV) to the voltage representing the detected current value flowing through the coil L It is configured to be connected to the inverting input terminal of the comparator 4. That is, when the current value IL flowing through the coil L is converted to the voltage value VL and input to the inverting input terminal of the comparator 4, the offset voltage Voff ⁇ from the voltage source 20 is given. Then, in the comparator 4, the voltage value VL given the offset voltage Voff ⁇ is compared with the voltage Vth fed back to its non-inverting input terminal via the differential amplifier 2 and the level shifter 3.
- Voff for example, 30 mV
- FIG. 2 shows a transition diagram of the signals of each unit at this time.
- the output of the RS flip-flop 5 becomes high as shown in FIG.
- Driver 1 turns on MOS transistor Trl and turns off MOS transistor Tr2.
- FIG. 2 (a) a current flows from the MOS transistor Trl into the coil L, and the current value IL flowing through the coil L increases, so that the comparator shown in FIG.
- the voltage VL input to the inverting input terminal 4 decreases.
- the current value 10 shown in FIG. 2A is an average value of the current value IL flowing through the coil L.
- the output voltage appearing at the output terminal OUT is divided by the resistors Rl and R2 and fed back to the differential amplifier 2, and the difference between the output voltage and the reference voltage Vref is amplified. A voltage signal indicating an error from the voltage Vref is output. Thereafter, this voltage signal is applied to the level shifter 3 to be level-shifted to the power supply potential side. Therefore, the voltage Vth output from the level shifter 3 increases as the output voltage appearing at the output terminal OUT increases. Since the voltage from 2 decreases, the voltage value increases. Thus, the voltage Vth applied from the level shifter 3 to the non-inverting input terminal of the comparator 4 represents the output voltage appearing at the output terminal OUT.
- the MOS transistor Trl is OFF and the MOS transistor Tr2 is ON, and no current flows through the coil L as shown in FIG. 3 (a).
- the voltage VL applied to the input terminal is the offset voltage from the power supply voltage Vcc by the voltage source 20.
- Vcc—Voff which is the value obtained by dropping the voltage by the voltage Voff.
- the MOS transistor Trl is turned on by the drive 1 and the MOS transistor Tr2 is turned off, and a current starts to flow through the coil L as shown in FIG. Therefore, the voltage VL input to the inverting input terminal of the comparator 4 drops by the amount of the current IL flowing through the coil L. Then, as the current IL flowing through the coil L increases as shown in FIG. 3A, the voltage VL input to the inverting input terminal of the comparator 4 decreases as shown in FIG. 3B. When the voltage VL becomes lower than the voltage Vth from the level shifter 3 as shown in FIG. 3 (b), as shown in FIG. 3 (e), the signal of the comparator 4 is switched to high. As shown in FIG. 3 (c), the signal from the RS flip-flop 5 goes low.
- the signal from the RS flip-flop 5 becomes low, the MOS transistor Trl is turned off and the MOS transistor Tr2 is turned on by the driver 1, and the current value IL flowing through the coil L is changed as shown in FIG. reduced as in a).
- the capacitor C is charged and the output voltage from the output terminal OUT increases, and as shown in FIG. 3 (b), the voltage Vth from the level shifter 3 increases. Will be higher.
- the capacitor C discharges, the output voltage from the output terminal OUT decreases, and the above operation is repeated.
- the ON period of the MOS transistor Trl can be made longer than when a heavy load is applied, and the duty ratio representing the period during which the MOS transistor Trl is ON can be made larger than when a heavy load is applied. Can be made smaller. That is, by intermittently performing the switching operation performed every period tb under the heavy load every plural periods, the efficiency at the time of no load or light load can be improved.
- FIG. 4 shows an example of the configuration of a current detection circuit 10 that detects the amount of current flowing through the coil L and converts it into a voltage value in such a switching power supply device. That is, a p-channel MOS transistor Tra in which the gate and the drain are connected to the gate and the drain of the MOS transistor Trl, respectively, the drain is connected to the source of the MOS transistor Tra, and the source is supplied with the power supply potential and the gate is referenced to the gate.
- the current detection circuit 10 is configured by the p-channel MOS transistor Trb to which the potential is applied.
- the MOS transistor Trb operates as a resistor. Then, the same voltage as the voltage applied from the driver 1 to the gate of the MOS transistor Trl is applied to the gate of the MOS transistor Tra, thereby driving the MOS transistor Tra. At this time, the voltage appearing at the connection node between the drains of the MOS transistors Trl and Tr2 is applied to the drain of the MOS transistor Tra, and a current proportional to the current flowing through the MOS transistor Trl flows through the MOS transistors Tra and Trb.
- the voltage drop caused by the ON resistance of the MOS transistor Trb appears as a value proportional to the current value proportional to the current flowing through the MOS transistor Trl, that is, a value proportional to the current value flowing through the coil L.
- the voltage dropped by the ON resistance of the MOS transistor Trb appears as the detection current value of the coil L at the connection node between the source of the MOS transistor Tra and the drain of the MOS transistor Trb, 4 Inverted input terminal.
- the source of the MOS transistor Tra and the MOS transistor Trb The other end of the resistor Ra whose one end is connected to the inverting input terminal of the comparator 4 is connected to the connection node with the drain of the comparator 4, and the constant current source 11 that supplies a constant current to the inverting input terminal of the comparator 4 is connected. Is done. The other end of the constant current source 11 is grounded.
- a voltage drop of the resistor Ra generated by flowing a constant current ⁇ 3 ⁇ 4 by the constant current source 11 to the resistor Ra is given as an offset voltage Voff. . That is, the resistor Ra and the constant current source 10 operate as the voltage source 20.
- the power supply voltage is set to Vcc
- the ON resistance of the MOS transistor Trb is set to Rx
- the MOS transistor Tra A voltage Vcc Rx XAX IL appears at the connection node between the source and the drain of the MOS transistor Trb.
- this voltage Vcc RxXA XIL is output as the output of the current detection circuit 10 and given to one end of the resistor Ra
- the offset due to the voltage drop of the resistor Ra is applied to the inverting input terminal of the comparator 4 as the voltage VL.
- FIG. 5 is a block diagram showing the internal configuration of the switching power supply device of the present embodiment.
- elements and portions used for the same purpose as in the switching power supply device of FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the switching power supply device of FIG. 5 includes a voltage source 20a for providing an offset voltage Vxoff ⁇ switched according to the output of the comparator 4, instead of the voltage source 20 in the switching power supply device of FIG. That is, when the current value IL flowing through the coil L is converted into the voltage value VL and input to the inverting input terminal of the comparator 4, the offset voltage Vxoff ⁇ from the voltage source 20a is given. At this time, when the output of the comparator 4 becomes high, the value of the offset voltage Vx off from the voltage source 20a becomes Vhoff (for example, 30 mV), and when the output of the comparator 4 becomes low, the voltage from the voltage source 20a becomes low. The value of the offset voltage Vxoff becomes Vloff (for example, 20 mV). The relationship between the offset voltages Vhoff and Vloff is Vhoff> VloiTC.
- FIG. 6 shows a transition diagram of signals of each unit of the switching power supply device of the present embodiment.
- FIG. 6A when a current flows from the MOS transistor Trl into the coil L and the current IL flowing through the coil L increases, as shown in FIG.
- the voltage VL input to the inverting input terminal of the comparator 4 becomes low.
- this voltage VL is applied from the level shifter 3 to the non-inverting input terminal of the comparator 4 as shown in FIG.
- the comparator 4 When the voltage becomes lower than the input voltage Vth, a high signal is output from the comparator 4 as shown in FIG.
- the voltage obtained by detecting the current IL flowing through the coil L is supplied from the voltage source 20 as in the first embodiment.
- the cut-off voltage Vxoffl is sufficiently higher than this. That is, the voltage values Vhoff and Vloff given as the offset voltage Vxoff do not need to consider the influence on the voltage VL input to the inverting input terminal of the comparator 4. Is done.
- the resistor Ra for giving the offset voltage Voff ⁇ is a variable resistor Rb whose resistance value is switched by the output of the comparator 4. That is, the voltage source 21a is configured by the variable resistor Rb and the constant current source 11.
- the other configuration is the same as the configuration in FIG.
- the offset voltage applied to the voltage value representing the detection current of the coil L is switched in accordance with the output of the comparator 4 to give hysteresis, whereby the first Compared with the embodiment, the comparator 4 can also output the clock signal more reliably, and can prevent malfunction of the RS flip-flop 5.
- FIG. 9 is a block diagram showing the internal configuration of the switching power supply device of the present embodiment.
- elements and portions used for the same purpose as in the switching power supply device of FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the switching power supply device of FIG. 9 differs from the switching power supply device of FIG. 1 in that the oscillator 6 outputs a slope compensation signal having a cycle tb for performing slope compensation, and outputs the slope compensation signal as the slope compensation signal.
- a voltage source 21 whose voltage value changes according to the voltage is provided between the inverting input terminal of the comparator 4 and the voltage source 20. Therefore, when the current value IL flowing through the coil L is converted to the voltage value VL and input to the inverting input terminal of the comparator 4, the offset voltage Voff and the slope compensation voltage Vslope are added.
- the voltage value VL applied to the inverting input terminal of the comparator 4 is different, and other operations are the same as those of the first embodiment. Therefore, in the following, the relationship between the voltage value VL applied to the inverting input terminal of the comparator 4 and the slope compensation voltage Vslope will be described, and for the other portions, the description in the first embodiment will be referred to. Shall be.
- This switching power supply device performs the same operation as the switching power supply device of the first embodiment (FIG. 1) except that it changes according to the value slope compensation voltage V slope of the voltage VL. That is, the slope compensation voltage Vslope from the voltage source 21 and the offset voltage Voff from the voltage source 20 changing as shown in FIG. 10 (f) were obtained from the detection current IL of the coil L as shown in FIG. 10 ( a ). By subtracting from the voltage value, the voltage VL as shown in FIG. 10 (b) is input to the inverting input terminal of the comparator 4.
- the oscillator 6 outputs a clock signal that goes high every cycle tb as shown in FIG. 10D, and also outputs a slope compensation signal having the same cycle tb as this clock signal. . Therefore, the slope compensation voltage Vslope from the voltage source 21 is equal to the period t as shown in FIG. During b, the value gradually increases and reaches a maximum value VSmax (for example, 20 mV), and then reaches a minimum value of 0.
- the clock signal is output from the oscillator 6 after the slope compensation voltage Vslope has shifted from the maximum value VSmax to the minimum value 0 as shown in FIGS. In this way, the slope compensation voltage Vslope from the voltage source 21 changes in value almost in the form of a triangular wave at every cycle tb, as shown in FIG. 10 (f).
- the operation when the load connected to the output terminal OUT is no load or light load will be described below with reference to FIG.
- the same operation as that of the switching power supply device of the first embodiment (FIG. 1) is performed except that the value of the voltage VL is changed by the slope compensation voltage Vslope. That is, the slope compensation voltage Vslope from the voltage source 21 and the offset voltage Voff from the voltage source 20 changing as shown in FIG. 11 (f)) were obtained from the coil L detection current IL as shown in FIG. 11 (a).
- the voltage VL as shown in FIG. 11B is input to the inverting input terminal of the comparator 4 by being subtracted from the voltage value.
- the slope compensation voltage Vslope from the voltage source 21 shown in FIG. 11 (f) changes in the same manner as in FIG. 10 (f).
- the slope compensation voltage Vslope from the voltage source 21 is changed from the maximum value VSmax to the minimum value 0 as shown in FIG. 11 (f).
- the voltage Vth output from the level shifter 3 becomes lower than the voltage VL as shown in FIG. 11 (b). That is, as shown in FIG. 11 (b), when the value of the voltage VL applied to the inverting input terminal of the comparator 4 increases from Vcc—Voff—VSmax to Vcc—Voff, the voltage Vth becomes higher than the voltage Vcc. — Lower than Voff.
- FIG. 12 an n-channel MOS transistor Trx having a drain connected to a connection node between the resistor Ra and the constant current source 11, and a gate and a drain connected to the gate of the MOS transistor Trx MOS transistor Try, MOS transistor Trz with drain connected to the source of MOS transistor Try, resistor Rc connected to source of MOS transistor Trx, capacitor C1 connected to source of MOS transistor Try, MOS transistor
- the current source 21 is configured by including the constant current source 12 in the drain of Trx.
- the other configuration is the same as the configuration in FIG.
- the power supply potential is applied to the constant current source 12, and the other ends of the capacitor C1 and the resistor Rc are grounded. Then, the clock signal from the oscillator 6 is input to the gate of the MOS transistor Trz. At this time, the voltage Vslope by the current source 21 is generated by the voltage drop amount Ra X Islope of the resistor Ra due to the current Islope flowing through the MOS transistor Trx. Similarly to the first embodiment, the voltage Voff ⁇ is generated by the current source 20 from the voltage Ioff of the resistor Ra caused by the current Ioff flowing through the constant current source 11.
- the duty ratio at which the MOS transistor Trl is turned on when a heavy load is applied is large.
- the variation in the current in the coil L when it is disconnected can be reduced, and the frequency division oscillation can be suppressed.
- the output of four comparators can be made low in synchronization with the application of the clock signal, and the efficiency is higher than that of the first embodiment. Can work well.
- a constant offset voltage V 0 ff3 ⁇ 4S is provided by the voltage source 20.
- the comparator 4 It may be provided with a voltage source 20a that switches the offset voltage Vxo according to the output. In this manner, by providing the voltage source 20a and switching the offset voltage Vxoff ⁇ to provide hysteresis, the comparator 4 can output the clock signal more reliably as in the second embodiment, and the RS flip-flop 5 Can be prevented from malfunctioning.
- the step-down switching power supply device is used.
- a step-up switching power supply device having a configuration as shown in FIG. 13A or an inverting switching power supply device having a configuration as shown in FIG. 13B is provided. It may be a device. 13A and 13B show the configuration when the step-up type and inversion type switching power supply devices are applied to the switching power supply device of the first embodiment.
- the present invention can also be applied to a switching power supply device in the form.
- the power supply potential is applied to one end.
- a capacitor C having one end connected to the power source of the diode D.
- an inverting type switching power supply device as shown in FIG. 13B has a coil having one end grounded, a drain connected to the other end of the coil L, and a p-channel MOS controlled by a driver lb. It comprises a transistor Trp, a diode D having a power source connected to the drain of the MOS transistor Trp, and a capacitor C having one end connected to the anode of the diode D. Then, the current flowing through the coil L or the MOS transistor Trp is fed back to the inverting input terminal of the comparator 4 as a voltage value. At this time, the offset voltage Voff is given by the voltage source 20.
- each block operates based on the power supply potential, but each block may operate based on the ground potential. At this time, it is sufficient if the respective blocks are configured to have the opposite polarities, and the basic configuration of each block can be realized by being the same as the configuration in each of the above-described embodiments.
- the output from the differential amplifier is assumed to be input to the comparator via the level shifter. The output of the differential amplifier is directly input to the comparator without solving the level shifter. It does not matter if it is done.
- the switching power supply device of the present invention can be applied to mobile devices such as mobile phones and mobile terminal devices.
- the portable device operates as a switching power supply device that transforms the voltage from the secondary battery and supplies the voltage to other circuit devices. Therefore, with the configuration according to the present invention, the switching power supply device can be operated with high efficiency when the other circuit devices of the portable device are turned off and a light load or no load occurs, and the power supply is switched off. Power consumption can be reduced.
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Priority Applications (3)
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JP2005517913A JP4721905B2 (ja) | 2004-02-13 | 2005-01-20 | スイッチング電源装置及び携帯機器 |
US10/589,163 US7321222B2 (en) | 2004-02-13 | 2005-01-20 | Switching regulator with DC offset (bias) in controller |
EP05703865.5A EP1715569B1 (en) | 2004-02-13 | 2005-01-20 | Switching power supply apparatus and mobile device |
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JP2004036770 | 2004-02-13 | ||
JP2004-036770 | 2004-02-13 |
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US (1) | US7321222B2 (ja) |
EP (1) | EP1715569B1 (ja) |
JP (1) | JP4721905B2 (ja) |
KR (1) | KR20060110363A (ja) |
CN (1) | CN100499333C (ja) |
TW (1) | TWI360938B (ja) |
WO (1) | WO2005078910A1 (ja) |
Cited By (16)
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JP2007215391A (ja) * | 2005-11-08 | 2007-08-23 | Renesas Technology Corp | スイッチング電源装置と半導体集積回路装置及び電源装置 |
JP2009512405A (ja) * | 2005-10-09 | 2009-03-19 | システム ジェネラル コーポレイション | オフ時間変調を有して一次側制御電源の効率を改善するスイッチング制御回路 |
US7576527B1 (en) * | 2006-07-20 | 2009-08-18 | Marvell International Ltd. | Low power DC-DC converter with improved load regulation |
JP2009195022A (ja) * | 2008-02-14 | 2009-08-27 | Mitsumi Electric Co Ltd | Dc−dcコンバータおよび電源制御用半導体集積回路 |
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JP2020202709A (ja) * | 2019-06-13 | 2020-12-17 | 株式会社明電舎 | 絶縁性dc/dcコンバータの動作監視装置 |
JP7103308B2 (ja) | 2019-06-13 | 2022-07-20 | 株式会社明電舎 | 絶縁性dc/dcコンバータの動作監視装置 |
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Also Published As
Publication number | Publication date |
---|---|
CN1918777A (zh) | 2007-02-21 |
EP1715569B1 (en) | 2019-06-19 |
EP1715569A4 (en) | 2009-07-15 |
EP1715569A1 (en) | 2006-10-25 |
JPWO2005078910A1 (ja) | 2007-10-18 |
CN100499333C (zh) | 2009-06-10 |
TWI360938B (en) | 2012-03-21 |
US7321222B2 (en) | 2008-01-22 |
TW200527806A (en) | 2005-08-16 |
KR20060110363A (ko) | 2006-10-24 |
US20070170904A1 (en) | 2007-07-26 |
JP4721905B2 (ja) | 2011-07-13 |
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