CN115037164B - Switch converter with wide-range output and control method thereof - Google Patents

Switch converter with wide-range output and control method thereof Download PDF

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CN115037164B
CN115037164B CN202210964467.2A CN202210964467A CN115037164B CN 115037164 B CN115037164 B CN 115037164B CN 202210964467 A CN202210964467 A CN 202210964467A CN 115037164 B CN115037164 B CN 115037164B
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voltage
circuit
signal
output
power supply
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CN115037164A (en
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杨洋
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Joulwatt Technology Co Ltd
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Joulwatt Technology Co Ltd
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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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

Abstract

The application discloses a switching converter with wide-range output and a control method thereof.A signal feedback circuit obtains a power supply reference signal related to a feedback signal at the input side or the output side of a power level circuit, a voltage conversion circuit converts a first direct current voltage received by the voltage conversion circuit into an expected second direct current voltage according to the power supply reference signal, and the second direct current voltage is used as the power supply voltage of a control circuit of the switching converter. According to the technical scheme, the voltage difference of the input and output voltages of the voltage conversion circuit can be reduced, the voltage conversion efficiency is improved, the driving loss of a system and the static power consumption of a control chip can be optimized, and the standby or light-load power consumption is reduced.

Description

Switch converter with wide-range output and control method thereof
Technical Field
The present invention relates to the field of power electronics technologies, and in particular, to a switching converter with wide output range and a control method thereof.
Background
In the flyback converter, a control chip of a primary side is arranged on the primary side, the flyback converter comprises a transformer, the transformer generally comprises three windings which are respectively a primary winding, a secondary winding and an auxiliary winding, wherein the primary winding is used for connecting the input of the flyback converter, the secondary winding is used for connecting the output of the flyback converter, the auxiliary winding is used for providing a power supply source of a power supply circuit, the primary side and the secondary winding are used in a different-name end coupling mode, and the auxiliary winding and a secondary output winding are used in a same-name end coupling mode.
With the appearance of PD adapters, the output voltage range ranges from 3.3v to 48v, or the range is wider, a common auxiliary winding is coupled to the same-name end of the secondary output winding, the voltage range of the auxiliary winding after passing through the rectifier circuit changes with the change of the output voltage, and the power supply range requirement of a common primary control chip is narrower, in order to solve the problem, the existing scheme at present has:
1) As shown in fig. 1, the LDO voltage regulator circuit is used to convert the rectified wider input voltage of the auxiliary winding into a stable voltage; the LDO circuit is used for voltage stabilization and power supply, so that the power consumption is large, and especially when the voltage difference between the input and the output of the LDO circuit is large. In addition, the LDO only has a linear voltage reduction function, and when the rectified voltage of the auxiliary winding is low, the LDO does not have a voltage boosting function, so that the application of wide-range output voltage is not facilitated.
2) As shown in fig. 2, the use of the DC-DC converter, which converts the rectified wide input voltage Vin of the auxiliary winding into a stable voltage output, reduces power consumption while controlling the stability of the output voltage. The DC-DC converter here includes a boost circuit, a buck-boost circuit, and the like. There are also limitations in use with the use of DC-DC converters; for example, when the input voltage Vin is low, although the DC-DC converter boosts the output voltage Vcc by the boost circuit, a large boost ratio causes the DC-DC efficiency to be lowered; in addition, since the driving voltage of the control chip of the flyback converter generally has a correlation with the Vcc power supply, when a fixed Vcc voltage is used, the Vcc voltage may be higher under light load, which results in higher driving voltage, and additional driving loss and power consumption of the chip may be caused.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a switching converter with wide output range and a control method thereof, so as to solve the technical problems of low efficiency and chip loss in the prior art.
The application provides a switching converter of wide range output, including power stage circuit, control circuit and supply circuit, input voltage is received to power stage circuit's input, through the switch conversion in order to export anticipated output voltage at the output, supply circuit includes voltage conversion circuit and signal feedback circuit, voltage conversion circuit receives first direct current voltage to will according to the power supply reference signal first direct current voltage converts second direct current voltage output into, second direct current voltage is as control circuit's supply voltage, signal feedback circuit basis the feedback signal of power stage circuit input side or output side obtains the power supply reference signal.
Preferably, the power supply reference signal is positively correlated with the feedback signal within a preset range of the feedback signal.
Preferably, the power supply reference signal is maintained at a corresponding first reference value when the feedback signal on the input side or the output side of the power stage circuit is smaller than a corresponding first threshold value, and the power supply reference signal is maintained at a corresponding second reference value when the feedback signal on the input side or the output side of the power stage circuit is larger than a corresponding second threshold value, wherein the first reference value is smaller than the second reference value.
Preferably, the feedback signal is in a range greater than a first threshold and less than a second threshold, and the power supply reference signal is in a linear relationship with the feedback signal.
Preferably, the power supply reference signal is switched from a first reference value to a second reference value when the feedback signal rises from a first threshold value to a second threshold value, and the power supply reference signal is switched from the second reference value to the first reference value when the feedback signal falls from the second threshold value to the first threshold value.
Preferably, the signal feedback circuit includes a sampling circuit that samples information of the feedback signal to obtain a sampling signal, and a reference voltage circuit that receives the sampling signal to obtain a power supply reference signal that is positively correlated with the sampling signal.
Preferably, the switching converter includes an auxiliary winding, the auxiliary winding is coupled to a homonymous terminal of a secondary winding of the switching converter, the feedback signal is one of an output voltage or an output power representing the power stage circuit, and the first dc voltage is a voltage signal obtained by rectifying a voltage output by the auxiliary winding.
Preferably, the switching converter includes an auxiliary winding, the auxiliary winding is coupled to a dotted terminal of a primary winding of the switching converter, the feedback signal is an input voltage representing the power stage circuit, and the first dc voltage is a voltage signal obtained by rectifying a voltage output by the auxiliary winding.
Preferably, the primary side of the switching converter includes a power factor correction circuit, and the primary side winding is connected after the power factor correction circuit.
Preferably, the voltage conversion circuit is any one of a Boost circuit, a Buck-Boost circuit, a Cuk circuit, a Zeta circuit and a Sepic circuit.
In a second aspect, a control method for a switching converter with wide-range output is provided, wherein a feedback signal is obtained according to one of an input voltage, an output voltage or an output power of a power stage circuit representing the switching converter; obtaining a power supply reference signal according to the feedback signal; receiving a first direct-current voltage to convert the first direct-current voltage into a second direct-current voltage according to a power supply reference signal and output the second direct-current voltage, wherein the second direct-current voltage is used as a power supply voltage of the switch converter control circuit.
Preferably, the power supply reference signal is positively correlated with the feedback signal within a preset range of the feedback signal.
Preferably, the power supply reference signal is maintained at a corresponding first reference value when the feedback signal on the input side or the output side of the power stage circuit is smaller than a corresponding first threshold value, and the power supply reference signal is maintained at a corresponding second reference value when the feedback signal on the input side or the output side of the power stage circuit is larger than a corresponding second threshold value, wherein the first reference value is smaller than the second reference value.
With the circuit structure of the present invention, a power supply reference signal related to a feedback signal on the input side or the output side of the switching converter is obtained by the signal feedback circuit, and the voltage conversion circuit converts an input first direct-current voltage into a desired second direct-current voltage as a control circuit power supply voltage of the switching converter according to the power supply reference signal and outputs the desired second direct-current voltage. Through the technical scheme of the invention, the power supply voltage of the control circuit can be dynamically adjusted according to the feedback signal of the switch converter, for example, when the output signal of the switch converter is reduced, such as the output voltage, the input voltage of the voltage conversion circuit is also reduced, and at the moment, the closed-loop reference voltage of the voltage conversion circuit is adjusted to control the reduction of the power supply voltage, so that the voltage difference between the input voltage and the power supply voltage of the voltage conversion circuit is reduced, the efficiency of the voltage conversion circuit is improved, and at the moment, because the power supply voltage is reduced and the driving voltage is synchronously reduced, the driving loss and the static power consumption of a control chip at the moment can be properly optimized, and the standby or light-load power consumption is reduced; when the output voltage rises, the input voltage of the voltage conversion circuit also rises, the closed-loop control reference of the voltage conversion circuit is adjusted at the moment, the power supply voltage rises, the voltage difference between the input voltage and the power supply voltage is reduced, the output power is higher when the general output voltage is higher, the current of the primary side power switch can be increased, the power supply voltage is properly increased, the driving voltage is increased, and the conduction loss is optimized.
Drawings
Fig. 1 is a circuit block diagram of a first power supply mode of a flyback converter in the prior art;
fig. 2 is a circuit block diagram of a second power supply mode of a flyback converter in the prior art;
fig. 3 is a circuit block diagram of a first embodiment of a power supply mode of the flyback converter according to the present invention;
FIG. 4 is a waveform diagram according to FIG. 3;
fig. 5 is a circuit block diagram of a second embodiment of a power supply mode of the flyback converter according to the present invention;
FIG. 6 is a waveform diagram according to FIG. 5;
fig. 7 is a circuit block diagram of a third embodiment of a power supply mode of a flyback converter according to the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for convenience and clarity to assist in describing the embodiments of the present invention.
Fig. 3 is a circuit block diagram of a first embodiment of a power supply method of a flyback converter according to the present invention, and fig. 4 is a waveform diagram according to fig. 3. In this embodiment, the switching converter is exemplified by a flyback converter, and includes a power stage circuit, a control circuit, and a power supply circuit, where the power stage circuit includes a primary rectifier circuit, a primary input capacitor, a primary winding, a power switch, a secondary winding, and a rectifier circuit, and the power stage circuit receives an input voltage AC, and generates an output voltage Vo to be output after being processed by the power switch. The power supply circuit is used for generating a power supply voltage Vcc, and the control circuit is used for controlling the working state of the power switch Qp after receiving the power supply voltage Vcc.
As shown in fig. 3, the switching converter includes an auxiliary winding, in this embodiment, the auxiliary winding
The group is coupled with the homonymous terminal of the secondary winding of the switch converter, and the auxiliary winding obtains a coupled voltage V AUX Coupled voltage V AUX Rectified and outputted as a first direct current voltage Vin. Thus, the first dc voltage Vin varies with the variation of the output voltage, and the two are positively correlated.
In this embodiment, the power supply circuit includes a voltage conversion circuit and a signal feedback circuit, the voltage conversion circuit receives a first dc voltage Vin to convert the first dc voltage into a second dc voltage according to a power supply reference signal and output the second dc voltage as the power supply voltage Vcc of the control circuit, the signal feedback circuit includes a sampling circuit and a reference voltage circuit, the sampling circuit samples information of the feedback signal to obtain a sampling signal Vs, the reference voltage circuit receives the sampling signal to obtain a power supply reference signal Vcc _ ref positively correlated to the sampling signal, as shown in fig. 2, and the sampling circuit samples the voltage of the auxiliary winding to obtain a feedback signal representing the output voltage. Here, the feedback signal may be equal to the output voltage, or may be a voltage signal proportional to the output voltage, for example, a voltage signal proportional to the output voltage is obtained by a voltage dividing circuit. The voltage conversion circuit is any one of a Boost circuit, a Buck-Boost circuit, a Cuk circuit, a Zeta circuit and a Sepic circuit.
In the embodiment of the present invention, within the preset range of the feedback signal, the preset range is equal to or greater than a first threshold and equal to or less than a second threshold, and the power supply reference signal is positively correlated with the output feedback signal, where, when the feedback signal is the signal on the input side, the preset range is equal to or greater than the corresponding first threshold and equal to or less than the corresponding second threshold, and the feedback signal is the signal on the input side and the signal on the output side, and the threshold ranges corresponding to the signal on the input side and the signal on the output side may be the same or different. As shown in FIG. 3Taking the feedback signal at the output side as an example, when the feedback signal is smaller than the first threshold, the power supply reference signal is kept at the first reference value V CC_L When the feedback signal is larger than a second threshold value, the power supply reference signal is kept at a second reference value V CC_H First reference value V CC_L Is less than the second reference value V CC_H . Preferably, the feedback signal is within a range greater than a first threshold value and less than a second threshold value, such as V o_L To V o_H Corresponding to the sampled signal at V S_L To V S_H In a linear relationship proportional to said output feedback signal, as in the solid line (1), or when said feedback signal is from a first threshold V o_L Rises to a second threshold value V o_H While the supply reference signal is from a first reference value V CC_L Switching to the second reference value V CC_H When the feedback signal is from a second threshold V o_H Down to the first threshold value V o_L While the supply reference signal is from a second reference value V CC_H Switching to the first reference value V CC_L As indicated by the dashed line (2). Here, the power supply reference signal and the feedback signal are positively correlated, and the positive correlation is not limited to the above proportional linear relationship, but may be a stepped positive correlation or a curved positive correlation, and the power supply reference signal may be increased as the feedback signal increases and the power supply reference signal may be decreased as the feedback signal decreases.
According to the embodiment, under the condition that the primary control circuit is ensured to normally work, when the output voltage is lower, the closed-loop control reference of the power supply voltage output is reduced as much as possible, when the output voltage is lower, the voltage difference between the input and the output of the DC-DC (in a Boost mode) is reduced so as to improve the efficiency of the DC-DC converter, when the output voltage is lower, the general output power is also lower, and the driving level can be reduced by reducing the power supply voltage so as to reduce the power of a chip; under the high-voltage output of the output voltage Vo, the difference between the input voltage and the output voltage of a DC-DC (Buck voltage reduction form) can be reduced by properly increasing the voltage of the power supply Vcc so as to improve the efficiency of the DC-DC, the general output power is larger when the output voltage is high, and the driving level can be properly increased by increasing the voltage of the Vcc, so that the conduction loss of a main power tube is reduced.
Fig. 5 is a circuit block diagram of a second embodiment of a power supply method of the flyback converter according to the present invention, and fig. 6 is a waveform diagram according to fig. 5. The feedback signal is output power, and the sampling signal is an error compensation signal obtained according to the output power. The signal feedback circuit in this embodiment includes a sampling circuit and a reference voltage circuit, the sampling circuit samples the output signal and feeds back the output signal to a primary side through an optical coupler to obtain an error compensation signal, the error compensation signal is transmitted to the reference voltage circuit as a sampling signal, and the reference voltage circuit receives the error compensation signal to obtain a power supply reference signal positively correlated to the error compensation signal. The supply reference signal Vcc _ ref is obtained in a similar manner as in the previous embodiment, with reference to FIG. 6, with the output power being in a range greater than the first threshold value and less than the second threshold value, e.g., P o_L To P o_H Corresponding to the sampled signal at V comp_L To V comp_H In a linear relationship proportional to the output feedback signal, as in the solid line (1), or when the output power is from a first threshold value P o_L Rises to a second threshold value P o_H While the supply reference signal is from a first reference value V CC_L Switching to the second reference value V CC_H When the output power is from a second threshold value P o_H Down to the first threshold P o_L While said supply reference signal is derived from a second reference value V CC_H Switching to the first reference value V CC_L As indicated by the dashed line (2).
Similarly, in this embodiment, the closed-loop reference of the power supply voltage Vcc is reduced as much as possible under the condition that the primary side control circuit (or the control chip) is ensured to work normally, and when the error compensation signal Vcomp is low, which means that the output power is low, the driving level can be reduced properly by reducing the power supply voltage Vcc, so that the power of the chip is reduced; when the error compensation signal Vcomp is high, the output power is high, and the drive level can be appropriately raised by appropriately raising the Vcc voltage, and the conduction loss of the main power transistor can be reduced.
Fig. 7 is a circuit block diagram of a third embodiment of a power supply mode of the flyback converter according to the present invention; in this embodiment, the switch converter includes an auxiliary winding, the auxiliary winding is coupled to a dotted terminal of a primary winding of the switch converter, the first dc voltage is a voltage signal obtained by rectifying a voltage output by the auxiliary winding, and the feedback signal is input voltage information representing an input side. The primary side of the switching converter further comprises a power factor correction circuit, the primary side winding is connected behind the power factor correction circuit, and the first direct-current voltage changes along with the voltage of the primary side winding. The generation mode and the working principle of the power supply circuit are the same as those of the first embodiment, for the application of the PD adapter, large fluctuation can be caused to the input voltage of the power supply circuit due to large variation of the output voltage range, the input voltage generally varies in the range of 80VDC to 374VDC, the variation is small relative to the variation of the output voltage, and the voltage source of the power supply circuit is related to the input side of the primary side, so that the variation of the auxiliary power supply voltage can be changed along with the input voltage, the input-output voltage difference of the power supply voltage can be reduced, and the efficiency optimization of the power supply circuit is facilitated. Furthermore, for the cascade structure collocated with the PFC, since the PFC bus voltage is basically stable, and the variation ratio is basically about 1, the variation ratio of the input voltage to the flyback converter is very small, and an optimized power supply combination scheme is generated.
It should be noted that the feedback signal in the present embodiment is exemplified by the input voltage on the input side or the output voltage and the output power on the output side, but the signal related to the input voltage on the input side or the signal related to the output voltage on the output side can be used as the feedback signal, and it is within the scope of the present invention to optimize the output-input voltage difference of the power supply voltage.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims (13)

1. A switching converter with wide-range output, which comprises a power stage circuit, a control circuit and a power supply circuit, wherein the input end of the power stage circuit receives an input voltage, and the power stage circuit is switched by a switch to output a desired output voltage at the output end,
the power supply circuit comprises a voltage conversion circuit and a signal feedback circuit,
the voltage conversion circuit receives a first direct current voltage to convert the first direct current voltage into a second direct current voltage according to a power supply reference signal and output the second direct current voltage as a power supply voltage of the control circuit,
the signal feedback circuit obtains the power supply reference signal according to a feedback signal at the input side or the output side of the power stage circuit.
2. The switching converter according to claim 1,
and within the preset range of the feedback signal, the power supply reference signal is positively correlated with the feedback signal.
3. The switching converter according to claim 2, wherein the supply reference signal is held at a corresponding first reference value when the feedback signal on the input side or the output side of the power stage circuit is smaller than a corresponding first threshold value, and held at a corresponding second reference value when the feedback signal on the input side or the output side of the power stage circuit is larger than a corresponding second threshold value,
wherein the first reference value is smaller than the second reference value.
4. The switching converter according to claim 3, wherein the feedback signal is in a range greater than a first threshold and less than a second threshold, and the supply reference signal is linear with the feedback signal.
5. A switching converter according to claim 3, characterized in that the supply reference signal switches from a first reference value to a second reference value when the feedback signal rises from a first threshold value to a second threshold value, and from the second reference value to the first reference value when the feedback signal falls from the second threshold value to the first threshold value.
6. The switching converter according to claim 1, wherein the signal feedback circuit includes a sampling circuit and a reference voltage circuit,
the sampling circuit samples information of the feedback signal to obtain a sampled signal,
the reference voltage circuit receives the sampling signal to obtain a power supply reference signal positively correlated with the sampling signal.
7. The switching converter according to claim 6,
the switching converter includes an auxiliary winding coupled to a homonymous terminal of a secondary winding of the switching converter,
the feedback signal is indicative of one of an output voltage or an output power of the power stage circuit,
the first direct current voltage is a voltage signal which is obtained by rectifying the voltage output by the auxiliary winding.
8. The switching converter according to claim 6, wherein the switching converter includes an auxiliary winding coupled to a homonymous terminal of a primary winding of the switching converter,
the feedback signal is indicative of an input voltage of the power stage circuit,
the first direct current voltage is a voltage signal which is obtained by rectifying the voltage output by the auxiliary winding.
9. The switching converter according to claim 8, wherein the primary side of the switching converter comprises a power factor correction circuit, and the primary side winding is connected after the power factor correction circuit.
10. The switching converter according to claim 1, wherein the voltage conversion circuit is any one of a Boost circuit, a Buck-Boost circuit, a Cuk circuit, a Zeta circuit, and a Sepic circuit.
11. A control method of a switching converter with wide-range output,
obtaining a feedback signal according to one of an input voltage, an output voltage, or an output power characterizing a power stage circuit of the switching converter;
obtaining a power supply reference signal according to the feedback signal;
receiving a first direct current voltage to convert the first direct current voltage into a second direct current voltage according to a power supply reference signal and output the second direct current voltage, wherein the second direct current voltage is used as a power supply voltage of the switch converter control circuit.
12. The control method of the switching converter according to claim 11, wherein the power supply reference signal is positively correlated with the feedback signal within a preset range of the feedback signal.
13. The method according to claim 12, wherein the supply reference signal is held at a corresponding first reference value when the feedback signal on the input side or the output side of the power stage circuit is smaller than a corresponding first threshold value, and held at a corresponding second reference value when the feedback signal on the input side or the output side of the power stage circuit is larger than a corresponding second threshold value,
wherein the first reference value is smaller than the second reference value.
CN202210964467.2A 2022-08-12 2022-08-12 Switch converter with wide-range output and control method thereof Active CN115037164B (en)

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CN102843050B (en) * 2012-07-12 2015-07-22 上海新进半导体制造有限公司 Method and circuit for improving system output characteristics of switch power supply
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CN109450257B (en) * 2018-12-12 2019-08-27 西安矽力杰半导体技术有限公司 Isolated form switch converters and its control circuit and control method
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CN114583984A (en) * 2021-11-09 2022-06-03 深圳市必易微电子股份有限公司 Power supply circuit and power supply conversion system and control chip thereof

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