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CN117439408A - Stabilizing circuit and control method thereof - Google Patents

Stabilizing circuit and control method thereof Download PDF

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Publication number
CN117439408A
CN117439408A CN202311391114.9A CN202311391114A CN117439408A CN 117439408 A CN117439408 A CN 117439408A CN 202311391114 A CN202311391114 A CN 202311391114A CN 117439408 A CN117439408 A CN 117439408A
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CN
China
Prior art keywords
circuit
voltage
control
stabilizing
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311391114.9A
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Chinese (zh)
Inventor
张利新
袁振东
李剑英
李贵兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Sohoo Technology Co ltd
Original Assignee
Guangdong Sohoo Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Guangdong Sohoo Technology Co ltd filed Critical Guangdong Sohoo Technology Co ltd
Priority to CN202311391114.9A priority Critical patent/CN117439408A/en
Publication of CN117439408A publication Critical patent/CN117439408A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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 including plural semiconductor devices as final control devices for a single load
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a stabilizing circuit and a control method thereof, comprising the following steps: the transformer coupling circuit, the rectifying circuit, the chopper circuit and the voltage stabilizing control circuit; the transformer coupling circuit provides energy, the output end of the rectifying circuit is connected with the voltage stabilizing control circuit, the voltage stabilizing control circuit detects the output of the rectifying control circuit and determines the voltage stabilizing requirement, the chopper circuit obtains the preset voltage requirement according to the voltage stabilizing requirement, and the transformer coupling circuit provides energy to reach the preset voltage requirement. The conventional transformer coupling is used for providing energy to reach a preset low voltage requirement, positive rectification is conducted to form single direct current output voltage, negative rectification is conducted to release inductive energy, the microprocessor is facilitated to conduct internal current conversion control on detected voltage signals, received current is correspondingly processed, and the magnetic control switch of the magnetic control switch is conducted to achieve required voltage specifications. The circuit can effectively detect and control stable output voltage to meet the requirements of various places of demand.

Description

Stabilizing circuit and control method thereof
Technical Field
The invention relates to the technical field of circuit control, in particular to a stabilizing circuit and a control method thereof.
Background
Some circuits or devices need to operate at a specific voltage, and thus a constant voltage needs to be provided to the circuits or devices, an integrated circuit chip with a voltage stabilizing function is generally used to realize output of the constant voltage at present, but the cost of the integrated circuit chip is high, which results in an increase in design cost of the circuit.
In electronic devices, the power supply voltage may generally vary within a relatively large range, for example, a lithium ion battery in a portable device can provide a voltage of 4.2 volts when fully charged, and only 2.3 volts can be provided after discharging. The working circuit of the electronic device usually needs a stable power supply voltage, so that a low dropout linear regulator (Low Dropout Regulator, LDO) circuit is usually added at the output end of the power supply at present, and the low dropout linear regulator firstly converts the actual power supply voltage into the set regulated voltage and then provides the converted regulated voltage for the working circuit, so that the voltage provided for the working circuit by the low dropout linear regulator is always stable when the power supply voltage of the electronic device changes.
However, the voltage stabilizing control method of the existing voltage stabilizing circuit cannot simultaneously meet different voltage requirements.
Disclosure of Invention
The present invention provides a stabilizing circuit and a control method thereof, which solve the above problems in the prior art.
The present invention provides a stabilizing circuit, comprising: the transformer coupling circuit, the rectifying circuit, the chopper circuit and the voltage stabilizing control circuit;
the transformer coupling circuit provides energy for the rectifying circuit, the output end of the rectifying circuit is connected with the voltage stabilizing control circuit, the voltage stabilizing control circuit detects the output of the rectifying control circuit and determines the voltage stabilizing requirement, the chopper circuit obtains the preset voltage requirement according to the voltage stabilizing requirement, and the transformer coupling circuit provides energy to reach the preset voltage requirement;
the chopper circuit carries out corresponding processing on the control current received from the voltage stabilizing control circuit, and carries out duty ratio control on the magnetic control switch so as to achieve the preset voltage requirement for controlling the energy output of the transformer coupling circuit.
Preferably, the rectifying circuit positively rectifies into a single direct current output voltage, and negatively rectifies to release inductive energy.
Preferably, the voltage stabilizing control circuit uses a microprocessor to perform internal current conversion control on the detected voltage signal to form a control current.
Preferably, the transformer coupling circuit includes a transformer T1, the chopper circuit includes an inductance L6, and the rectification control circuit includes: diode D12, capacitor C26 and inductance L2, the voltage-stabilizing control circuit includes the voltage-stabilizing diode U6;
the output end of the transformer T1 is connected with an inductor L6, the other end of the inductor L6 is connected with the positive electrode of a diode D12, and the negative electrode of the diode D12 is connected with a capacitor C26 and an inductor L2.
Preferably, the method further comprises: a bandgap reference circuit and an LDO circuit; the bandgap reference circuit provides a reference voltage which is irrelevant to temperature, and the LDO circuit outputs a stable voltage value on the basis of the reference voltage;
preferably, the bandgap reference circuit includes: an operational amplifier, a bias circuit, a compensation circuit, and a reference voltage generation circuit;
the reference voltage generating circuit comprises a circuit for generating positive temperature coefficient current and a circuit for generating and summing negative temperature coefficients; the operational amplifier uses an active load differential pair circuit; the bias circuit includes providing a bias to the operational amplifier and providing a bias to the compensation circuit.
Preferably, the operational amplifier includes: NMOS transistors NM1, NM2 and NM3; the PMOS transistors PM1 and PM2 are formed, wherein NM1 and NM2 are a pair of input transistors of the operational amplifier, and the sizes of the two NMOS transistors are the same; the NM1 and NM2 NMOS tubes are connected to the X point and the Y point in the band gap reference circuit, the potentials of the two points are clamped, so that the voltages of the X point and the Y point are the same, NM3 is a bias tube of the operational amplifier and provides bias current for the operational amplifier, at the moment, the bias tube is equivalent to a current source, and the current of the active load differential pair is provided by NM3; the current mirror composed of PM1 and PM2 is a load tube of the operational amplifier, and the sizes of the two PMOS tubes PM1 and PM2 are the same.
Preferably, the compensation circuit includes: the circuit comprises two PMOS tubes PM5 and PM8; the two NMOS transistors NM5, NM6 and a resistor R3 form the compensation circuit together; wherein PM5, NM5 and NM6 form a group of current mirrors to supply power for the compensation circuit, PM8 and a resistor R3 are core parts of the compensation circuit; the drain electrode of PM8 is connected with Vref of the band gap reference circuit, and the compensation current generated by PM8 flows through a resistor formed by the band gap voltage; the resistor R3 is connected with the grid electrode of the PM8 to control the working state of the PM8 and further control the compensation current.
Preferably, the LDO circuit comprises: an error amplifier circuit, a buffer circuit and a transient enhancement circuit;
the error amplifier is a core circuit in the LDO circuit, the inverting input end of the error amplifier is connected with the reference voltage output by the front bandgap reference circuit, the non-inverting input end of the error amplifier is connected with the voltage division sampling circuit in the rear LDO circuit, the difference between the two is amplified, and the grid voltage of the power tube is controlled;
the first stage of the error amplifier is an active load differential pair operational amplifier, wherein the PMOS tubes PM11 and PM14 form a current mirror to provide current for the first stage and the second stage operational amplifier; the PMOS tubes PM12 and PM13 form an input differential pair, the inverting input end is connected with a reference voltage source, and the non-inverting input end is connected with the feedback voltage of the voltage division sampling circuit; the NMOS transistors NM11 and NM12 form an active load, and the current input into the differential pair is converted into voltage at the output end; the second stage consists of NMOS tube NM13, which can amplify the gain voltage of the first stage and ensure the swing of output voltage;
the buffer circuit is connected between the output end of the error amplifier and the power tube; the aspect ratio of the power tube is related to the pressure difference performance, the aspect ratio of the power tube is in direct proportion to the pressure difference performance, and when the aspect ratio is larger, the whole pressure difference of the LDO circuit is smaller;
the transient enhancement circuit is used for detecting the change of the output voltage of the LDO circuit and rapidly charging and discharging the parasitic capacitance of the power tube, so that the time of transient response is reduced.
The invention also provides a control method of the stabilizing circuit, which comprises the following steps when the stabilizing circuit is adopted: :
s100, providing energy for a rectifying circuit by taking a transformer coupling circuit as a source of energy output; the output end of the transformer coupling circuit outputs preset voltage;
s200, rectifying circuit positive direction rectifies into single direct current output voltage, negative direction rectifies to release inductance energy, rectifying circuit outputs rectified voltage signal;
s300, detecting a rectified voltage signal output by the rectification control circuit by the voltage control circuit, and performing internal current conversion control on the detected rectified voltage signal by a microprocessor to form a control current;
s400, the chopper circuit correspondingly processes the control current received from the voltage stabilizing control circuit, and duty ratio control is carried out on the magnetic control switch to achieve the preset voltage for controlling the energy output of the transformer coupling circuit.
Preferably, the S400 includes:
s401, a chopper circuit generates SPWM waves for controlling on-off of a switching device in a transformer coupling circuit so as to regulate the output voltage of the transformer coupling circuit;
s402, carrying out signal acquisition on the output voltage of the rectification control circuit in real time to obtain an output feedback voltage, and comparing the output feedback voltage with a preset voltage value;
s403, according to the comparison result of the output feedback voltage and the preset voltage value, adjusting the SPWM wave to change the state of the transformer coupling circuit, and obtaining a stable output voltage.
Compared with the prior art, the invention has the following advantages:
the invention provides a stabilizing circuit and a control method thereof, wherein the stabilizing circuit comprises: the transformer coupling circuit, the rectifying circuit, the chopper circuit and the voltage stabilizing control circuit; the transformer coupling circuit provides energy for the rectifying circuit, the output end of the rectifying circuit is connected with the voltage stabilizing control circuit, the voltage stabilizing control circuit detects the output of the rectifying control circuit and determines the voltage stabilizing requirement, the chopper circuit obtains the preset voltage requirement according to the voltage stabilizing requirement, and the transformer coupling circuit provides energy to reach the preset voltage requirement. The conventional transformer coupling is used for providing energy to reach a preset low voltage requirement, positive rectification is conducted to form single direct current output voltage, negative rectification is conducted to release inductive energy, the microprocessor is facilitated to conduct internal current conversion control on detected voltage signals, received current is correspondingly processed, and the magnetic control switch of the magnetic control switch is conducted to achieve required voltage specifications. The circuit can effectively detect and control the stable output voltage so as to meet the requirements of various demand places.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a stabilizing circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a stabilizing circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of a stabilizing circuit in an embodiment of the invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
An embodiment of the present invention provides a stabilizing circuit, please refer to fig. 1 and 2, which includes: the transformer coupling circuit, the rectifying circuit, the chopper circuit and the voltage stabilizing control circuit;
the transformer coupling circuit provides energy for the rectifying circuit, the output end of the rectifying circuit is connected with the voltage stabilizing control circuit, the voltage stabilizing control circuit detects the output of the rectifying control circuit and determines the voltage stabilizing requirement, the chopper circuit obtains the preset voltage requirement according to the voltage stabilizing requirement, and the transformer coupling circuit provides energy to reach the preset voltage requirement. The chopper circuit carries out corresponding processing on the control current received from the voltage stabilizing control circuit, and carries out duty ratio control on the magnetic control switch so as to achieve the preset voltage requirement for controlling the energy output of the transformer coupling circuit.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme adopted by the embodiment is a transformer coupling circuit, a rectifying circuit, a chopper circuit and a voltage stabilizing control circuit; the transformer coupling circuit provides energy for the rectifying circuit, the output end of the rectifying circuit is connected with the voltage stabilizing control circuit, the voltage stabilizing control circuit detects the output of the rectifying control circuit and determines the voltage stabilizing requirement, the chopper circuit obtains the preset voltage requirement according to the voltage stabilizing requirement, and the transformer coupling circuit provides energy to reach the preset voltage requirement. The chopper circuit carries out corresponding processing on the control current received from the voltage stabilizing control circuit, and carries out duty ratio control on the magnetic control switch so as to achieve the preset voltage requirement for controlling the energy output of the transformer coupling circuit.
In another embodiment, the rectifying circuit rectifies positively into a single dc output voltage and rectifies negatively as inductive energy release.
In another embodiment, the voltage stabilizing control circuit uses a microprocessor to perform internal current conversion control on the detected voltage signal to form a control current.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme adopted by the embodiment is that the conventional transformer is used for coupling, energy is provided to achieve a preset low voltage requirement, positive rectification is conducted to form single direct current output voltage, negative rectification is conducted to release inductance energy, internal current conversion control of a detected voltage signal is facilitated to a microprocessor, corresponding processing is conducted on received current, and duty ratio control is conducted on a magnetic control switch of the current to achieve a required voltage specification. The circuit can effectively detect and control the stable output voltage to meet the requirements of various places of requirements (such as a voltage-reducing circuit and the like).
In another embodiment, referring to fig. 2, the transformer coupling circuit includes a transformer T1, the chopper circuit includes an inductor L6, and the rectification control circuit includes: diode D12, capacitor C26 and inductance L2, the voltage-stabilizing control circuit includes the voltage-stabilizing diode U6;
the output end of the transformer T1 is connected with an inductor L6, the other end of the inductor L6 is connected with the positive electrode of a diode D12, and the negative electrode of the diode D12 is connected with a capacitor C26 and an inductor L2.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme adopted by the embodiment is that the conventional transformer is used for coupling, energy is provided to achieve a preset low voltage requirement, positive rectification is conducted to form a single direct current output voltage, negative rectification is conducted to release inductive energy, the microprocessor is facilitated to conduct internal current conversion control on detected voltage signals, received current is correspondingly processed, and a magnetic control switch of the magnetic control switch is conducted to conduct duty ratio control to achieve a required voltage specification. The scheme provided by the embodiment can effectively detect and control the stable output voltage so as to meet the requirements of various demand places.
In another embodiment, the method further comprises: a bandgap reference circuit and an LDO circuit; the bandgap reference circuit provides a reference voltage which is irrelevant to temperature, and the LDO circuit outputs a stable voltage value on the basis of the reference voltage;
the bandgap reference circuit includes: an operational amplifier, a bias circuit, a compensation circuit, and a reference voltage generation circuit;
the reference voltage generating circuit comprises a circuit for generating positive temperature coefficient current and a circuit for generating and summing negative temperature coefficients; the operational amplifier uses an active load differential pair circuit; the bias circuit includes providing a bias to the operational amplifier and providing a bias to the compensation circuit.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme adopted by the embodiment further comprises: a bandgap reference circuit and an LDO circuit; the bandgap reference circuit provides a reference voltage which is irrelevant to temperature, and the LDO circuit outputs a stable voltage value on the basis of the reference voltage; the bandgap reference circuit includes: an operational amplifier, a bias circuit, a compensation circuit, and a reference voltage generation circuit; the reference voltage generating circuit comprises a circuit for generating positive temperature coefficient current and a circuit for generating and summing negative temperature coefficients; the operational amplifier uses an active load differential pair circuit; the bias circuit includes providing a bias to the operational amplifier and providing a bias to the compensation circuit.
In another embodiment, the operational amplifier includes: NMOS transistors NM1, NM2 and NM3; the PMOS transistors PM1 and PM2 are formed, wherein NM1 and NM2 are a pair of input transistors of the operational amplifier, and the sizes of the two NMOS transistors are the same; the NM1 and NM2 NMOS tubes are connected to the X point and the Y point in the band gap reference circuit, the potentials of the two points are clamped, so that the voltages of the X point and the Y point are the same, NM3 is a bias tube of the operational amplifier and provides bias current for the operational amplifier, at the moment, the bias tube is equivalent to a current source, and the current of the active load differential pair is provided by NM3; the current mirror composed of PM1 and PM2 is a load tube of the operational amplifier, and the sizes of the two PMOS tubes PM1 and PM2 are the same.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme adopted by the embodiment is that the operational amplifier comprises: NMOS transistors NM1, NM2 and NM3; the PMOS transistors PM1 and PM2 are formed, wherein NM1 and NM2 are a pair of input transistors of the operational amplifier, and the sizes of the two NMOS transistors are the same; the NM1 and NM2 NMOS tubes are connected to the X point and the Y point in the band gap reference circuit, the potentials of the two points are clamped, so that the voltages of the X point and the Y point are the same, NM3 is a bias tube of the operational amplifier and provides bias current for the operational amplifier, at the moment, the bias tube is equivalent to a current source, and the current of the active load differential pair is provided by NM3; the current mirror composed of PM1 and PM2 is a load tube of the operational amplifier, and the sizes of the two PMOS tubes PM1 and PM2 are the same.
In another embodiment, the compensation circuit includes: the circuit comprises two PMOS tubes PM5 and PM8; the two NMOS transistors NM5, NM6 and a resistor R3 form the compensation circuit together; wherein PM5, NM5 and NM6 form a group of current mirrors to supply power for the compensation circuit, PM8 and a resistor R3 are core parts of the compensation circuit; the drain electrode of PM8 is connected with Vref of the band gap reference circuit, and the compensation current generated by PM8 flows through a resistor formed by the band gap voltage; the resistor R3 is connected with the grid electrode of the PM8 to control the working state of the PM8 and further control the compensation current.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme adopted by the embodiment is that the compensation circuit comprises: the circuit comprises two PMOS tubes PM5 and PM8; the two NMOS transistors NM5, NM6 and a resistor R3 form the compensation circuit together; wherein PM5, NM5 and NM6 form a group of current mirrors to supply power for the compensation circuit, PM8 and a resistor R3 are core parts of the compensation circuit; the drain electrode of PM8 is connected with Vref of the band gap reference circuit, and the compensation current generated by PM8 flows through a resistor formed by the band gap voltage; the resistor R3 is connected with the grid electrode of the PM8 to control the working state of the PM8 and further control the compensation current.
The LDO circuit includes: an error amplifier circuit, a buffer circuit and a transient enhancement circuit;
the error amplifier is a core circuit in the LDO circuit, the inverting input end of the error amplifier is connected with the reference voltage output by the front bandgap reference circuit, the non-inverting input end of the error amplifier is connected with the voltage division sampling circuit in the rear LDO circuit, the difference between the two is amplified, and the grid voltage of the power tube is controlled;
the first stage of the error amplifier is an active load differential pair operational amplifier, wherein the PMOS tubes PM11 and PM14 form a current mirror to provide current for the first stage and the second stage operational amplifier; the PMOS tubes PM12 and PM13 form an input differential pair, the inverting input end is connected with a reference voltage source, and the non-inverting input end is connected with the feedback voltage of the voltage division sampling circuit; the NMOS transistors NM11 and NM12 form an active load, and the current input into the differential pair is converted into voltage at the output end; the second stage consists of NMOS tube NM13, which can amplify the gain voltage of the first stage and ensure the swing of output voltage;
the buffer circuit is connected between the output end of the error amplifier and the power tube; the aspect ratio of the power tube is related to the pressure difference performance, the aspect ratio of the power tube is in direct proportion to the pressure difference performance, and when the aspect ratio is larger, the whole pressure difference of the LDO circuit is smaller;
the transient enhancement circuit is used for detecting the change of the output voltage of the LDO circuit and rapidly charging and discharging the parasitic capacitance of the power tube, so that the time of transient response is reduced.
The alternating current signal input by the power supply is shaped into a positive half-wave direct current signal through the rectifying circuit, the half-wave direct current signal is converted into a smooth direct current signal through the energy storage circuit, a switch chip in the switch circuit controls direct current voltage applied to a primary coil of the conversion transformer through PWM waveforms, a secondary coil of the conversion transformer outputs the direct current voltage after passing through the secondary rectifying circuit, a feedback loop adjusts PWM duty ratio in the switch circuit through collecting voltage output by the power supply, so that the purpose of stabilizing output voltage is achieved, and a slow starting circuit is added in the feedback loop, so that instant impact current when a power supply system is electrified for the first time can be reduced, and further the switch power supply can stably start up work.
In another embodiment, the present embodiment further provides a control method of a stabilizing circuit, referring to fig. 3, the control method includes:
s100, providing energy for a rectifying circuit by taking a transformer coupling circuit as a source of energy output; the output end of the transformer coupling circuit outputs preset voltage;
s200, rectifying circuit positive direction rectifies into single direct current output voltage, negative direction rectifies to release inductance energy, rectifying circuit outputs rectified voltage signal;
s300, detecting a rectified voltage signal output by the rectification control circuit by the voltage control circuit, and performing internal current conversion control on the detected rectified voltage signal by a microprocessor to form a control current;
s400, the chopper circuit correspondingly processes the control current received from the voltage stabilizing control circuit, and duty ratio control is carried out on the magnetic control switch to achieve the preset voltage for controlling the energy output of the transformer coupling circuit.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme adopted by the embodiment is S100, the transformer coupling circuit is used as a source of energy output to provide energy for the rectifying circuit; the output end of the transformer coupling circuit outputs preset voltage; s200, rectifying circuit positive direction rectifies into single direct current output voltage, negative direction rectifies to release inductance energy, rectifying circuit outputs rectified voltage signal; s300, detecting a rectified voltage signal output by the rectification control circuit by the voltage control circuit, and performing internal current conversion control on the detected rectified voltage signal by a microprocessor to form a control current; s400, the chopper circuit correspondingly processes the control current received from the voltage stabilizing control circuit, and duty ratio control is carried out on the magnetic control switch to achieve the preset voltage for controlling the energy output of the transformer coupling circuit.
In another embodiment, the S400 includes:
s401, a chopper circuit generates SPWM waves for controlling on-off of a switching device in a transformer coupling circuit so as to regulate the output voltage of the transformer coupling circuit;
s402, carrying out signal acquisition on the output voltage of the rectification control circuit in real time to obtain an output feedback voltage, and comparing the output feedback voltage with a preset voltage value;
s403, according to the comparison result of the output feedback voltage and the preset voltage value, adjusting the SPWM wave to change the state of the transformer coupling circuit, and obtaining a stable output voltage.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A stabilizing circuit, comprising: the transformer coupling circuit, the rectifying circuit, the chopper circuit and the voltage stabilizing control circuit;
the transformer coupling circuit provides energy for the rectifying circuit, the output end of the rectifying circuit is connected with the voltage stabilizing control circuit, the voltage stabilizing control circuit detects the output of the rectifying control circuit and determines the voltage stabilizing requirement, the chopper circuit obtains the preset voltage requirement according to the voltage stabilizing requirement, and the transformer coupling circuit provides energy to reach the preset voltage requirement;
the chopper circuit carries out corresponding processing on the control current received from the voltage stabilizing control circuit, and carries out duty ratio control on the magnetic control switch so as to achieve the preset voltage requirement for controlling the energy output of the transformer coupling circuit.
2. The stabilizing circuit of claim 1, wherein said rectifying circuit positively rectifies into a single dc output voltage and negatively rectifies as inductive energy release.
3. The stabilizing circuit of claim 1, wherein the stabilizing control circuit uses a microprocessor to perform internal current switching control on the detected voltage signal to form the control current.
4. The stabilizing circuit of claim 1, wherein the transformer coupling circuit comprises a transformer T1, the chopper circuit comprises an inductance L6, and the rectification control circuit comprises: diode D12, capacitor C26 and inductance L2, the voltage-stabilizing control circuit includes the voltage-stabilizing diode U6;
the output end of the transformer T1 is connected with an inductor L6, the other end of the inductor L6 is connected with the positive electrode of a diode D12, and the negative electrode of the diode D12 is connected with a capacitor C26 and an inductor L2.
5. The stabilizing circuit of claim 1, further comprising: a bandgap reference circuit and an LDO circuit; the bandgap reference circuit provides a reference voltage which is irrelevant to temperature, and the LDO circuit outputs a stable voltage value on the basis of the reference voltage;
the bandgap reference circuit includes: an operational amplifier, a bias circuit, a compensation circuit, and a reference voltage generation circuit;
the reference voltage generating circuit comprises a circuit for generating positive temperature coefficient current and a circuit for generating and summing negative temperature coefficients; the operational amplifier uses an active load differential pair circuit; the bias circuit includes providing a bias to the operational amplifier and providing a bias to the compensation circuit.
6. The stabilizing circuit of claim 5, wherein said operational amplifier comprises: NMOS transistors NM1, NM2 and NM3; the PMOS transistors PM1 and PM2 are formed, wherein NM1 and NM2 are a pair of input transistors of the operational amplifier, and the sizes of the two NMOS transistors are the same; the NM1 and NM2 NMOS tubes are connected to the X point and the Y point in the band gap reference circuit, the potentials of the two points are clamped, so that the voltages of the X point and the Y point are the same, NM3 is a bias tube of the operational amplifier and provides bias current for the operational amplifier, at the moment, the bias tube is equivalent to a current source, and the current of the active load differential pair is provided by NM3; the current mirror composed of PM1 and PM2 is a load tube of the operational amplifier, and the sizes of the two PMOS tubes PM1 and PM2 are the same.
7. The stabilizing circuit of claim 5, wherein said compensation circuit comprises: the circuit comprises two PMOS tubes PM5 and PM8; the two NMOS transistors NM5, NM6 and a resistor R3 form the compensation circuit together; wherein PM5, NM5 and NM6 form a group of current mirrors to supply power for the compensation circuit, PM8 and a resistor R3 are core parts of the compensation circuit; the drain electrode of PM8 is connected with Vref of the band gap reference circuit, and the compensation current generated by PM8 flows through a resistor formed by the band gap voltage; the resistor R3 is connected with the grid electrode of the PM8 to control the working state of the PM8 and further control the compensation current.
8. The stabilizing circuit of claim 5, wherein the LDO circuit comprises: an error amplifier circuit, a buffer circuit and a transient enhancement circuit;
the error amplifier is a core circuit in the LDO circuit, the inverting input end of the error amplifier is connected with the reference voltage output by the front bandgap reference circuit, the non-inverting input end of the error amplifier is connected with the voltage division sampling circuit in the rear LDO circuit, the difference between the two is amplified, and the grid voltage of the power tube is controlled;
the first stage of the error amplifier is an active load differential pair operational amplifier, wherein the PMOS tubes PM11 and PM14 form a current mirror to provide current for the first stage and the second stage operational amplifier; the PMOS tubes PM12 and PM13 form an input differential pair, the inverting input end is connected with a reference voltage source, and the non-inverting input end is connected with the feedback voltage of the voltage division sampling circuit; the NMOS transistors NM11 and NM12 form an active load, and the current input into the differential pair is converted into voltage at the output end; the second stage consists of NMOS tube NM13, which can amplify the gain voltage of the first stage and ensure the swing of output voltage;
the buffer circuit is connected between the output end of the error amplifier and the power tube; the aspect ratio of the power tube is related to the pressure difference performance, the aspect ratio of the power tube is in direct proportion to the pressure difference performance, and when the aspect ratio is larger, the whole pressure difference of the LDO circuit is smaller;
the transient enhancement circuit is used for detecting the change of the output voltage of the LDO circuit and rapidly charging and discharging the parasitic capacitance of the power tube, so that the time of transient response is reduced.
9. A control method of a stabilizing circuit, comprising: the stabilizing circuit of any one of claims 1-8, performing the steps of:
s100, providing energy for a rectifying circuit by taking a transformer coupling circuit as a source of energy output; the output end of the transformer coupling circuit outputs preset voltage;
s200, rectifying circuit positive direction rectifies into single direct current output voltage, negative direction rectifies to release inductance energy, rectifying circuit outputs rectified voltage signal;
s300, detecting a rectified voltage signal output by the rectification control circuit by the voltage control circuit, and performing internal current conversion control on the detected rectified voltage signal by a microprocessor to form a control current;
s400, the chopper circuit correspondingly processes the control current received from the voltage stabilizing control circuit, and duty ratio control is carried out on the magnetic control switch to achieve the preset voltage for controlling the energy output of the transformer coupling circuit.
10. The method of controlling a stabilizing circuit according to claim 9, wherein the S400 includes:
s401, a chopper circuit generates SPWM waves for controlling on-off of a switching device in a transformer coupling circuit so as to regulate the output voltage of the transformer coupling circuit;
s402, carrying out signal acquisition on the output voltage of the rectification control circuit in real time to obtain an output feedback voltage, and comparing the output feedback voltage with a preset voltage value;
s403, according to the comparison result of the output feedback voltage and the preset voltage value, adjusting the SPWM wave to change the state of the transformer coupling circuit, and obtaining a stable output voltage.
CN202311391114.9A 2023-10-25 2023-10-25 Stabilizing circuit and control method thereof Pending CN117439408A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626976A (en) * 1984-01-23 1986-12-02 Hitachi, Ltd. Switch mode power supply having magnetically controlled output
CN101582639A (en) * 2008-05-16 2009-11-18 群康科技(深圳)有限公司 Switch power supply circuit
CN201985762U (en) * 2011-01-15 2011-09-21 青岛海信电器股份有限公司 Zero power consumption standby circuit and electrical appliance equipment comprising the same
CN108811261A (en) * 2018-09-13 2018-11-13 福州大学 A kind of visible light communication modulator approach of single-stage LED drive circuit
CN212726877U (en) * 2020-07-31 2021-03-16 浙江绍兴苏泊尔生活电器有限公司 Switching power supply circuit, electromagnetic heating circuit and electromagnetic heating appliance
CN114374323A (en) * 2020-10-15 2022-04-19 深圳市英维克信息技术有限公司 Isolated power supply circuit and electronic equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626976A (en) * 1984-01-23 1986-12-02 Hitachi, Ltd. Switch mode power supply having magnetically controlled output
CN101582639A (en) * 2008-05-16 2009-11-18 群康科技(深圳)有限公司 Switch power supply circuit
CN201985762U (en) * 2011-01-15 2011-09-21 青岛海信电器股份有限公司 Zero power consumption standby circuit and electrical appliance equipment comprising the same
CN108811261A (en) * 2018-09-13 2018-11-13 福州大学 A kind of visible light communication modulator approach of single-stage LED drive circuit
CN212726877U (en) * 2020-07-31 2021-03-16 浙江绍兴苏泊尔生活电器有限公司 Switching power supply circuit, electromagnetic heating circuit and electromagnetic heating appliance
CN114374323A (en) * 2020-10-15 2022-04-19 深圳市英维克信息技术有限公司 Isolated power supply circuit and electronic equipment

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