CN114726215B - High-gain boost converter for soft switching of impedance network shaped like Chinese character' tian - Google Patents
High-gain boost converter for soft switching of impedance network shaped like Chinese character' tian Download PDFInfo
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- CN114726215B CN114726215B CN202210411673.0A CN202210411673A CN114726215B CN 114726215 B CN114726215 B CN 114726215B CN 202210411673 A CN202210411673 A CN 202210411673A CN 114726215 B CN114726215 B CN 114726215B
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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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a field-shaped impedance network soft switch high-gain boost converter, wherein the voltage gain of the field-shaped impedance network boost converter is D/(1-D) 2 Compared with the traditional boost converter, the grid-shaped impedance network boost converter improves the voltage gain. The power circuit mainly comprises a power switch tube, an auxiliary switch tube, three power inductors, an auxiliary inductor, two middle energy storage capacitors, an output capacitor, an auxiliary capacitor, three diodes and two auxiliary diodes. Compared with a traditional booster circuit, the field-shaped impedance network soft switching high-gain boost converter provided by the text can realize zero-voltage zero-current switching-on and switching-off of the main switching tube and the auxiliary switching tube while realizing expansion of output voltage gain, is low in loss and high in transmission efficiency, and has rich applicability and practical value.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a field-shaped impedance network soft switching high-gain boost converter.
Background
The power device MOSFET is widely applied to occasions of short-circuit protection, motor control, switch circuits and the like, and various types and effective design and use methods of the MOSFET are promoted by different design requirements. When the MOSFET is applied to a conventional circuit, the voltage and the current are not zero in the switching process, the inductive turn-off voltage peak is large, the capacitive turn-on current peak is large, the electromagnetic interference is serious, the switching loss is obvious, and the switching noise is large; in addition, the voltage gain of the traditional boost converter is output voltage, the gain change range is very small, the output voltage is usually only 0 to 9 times of the input voltage, and the increasing industrial development requirements cannot be met. Therefore, the application range thereof is greatly limited.
Therefore, how to reduce the switching loss while increasing the voltage gain has made the problem to be solved by those skilled in the art.
The invention designs a boost converter with high gain and zero-voltage zero-current conversion for soft switching of a field-shaped impedance network, which aims to overcome the defects of the prior art and provide the boost converter with high gain and zero-voltage zero-current conversion. When the duty ratio of the power switch tube is designed to be 0.75, the voltage gain of the grid-shaped impedance network soft switching high-gain boost converter is 12 times.
Disclosure of Invention
The invention provides a grid-shaped impedance network soft switching high-gain boost converter. The method can be used for solving the problems of low voltage gain of the traditional boost converter, large switching loss and large noise of the traditional converter circuit.
In view of the above technical problems, the present invention provides a delta-shaped impedance network soft switching high-gain boost converter, which can realize a higher voltage gain, and also can reduce switching loss, and realize zero-voltage zero-current conversion of a power switching tube, and the boost converter includes: the direct-current power supply comprises a direct-current power supply, a power switch tube, an auxiliary switch tube, a first power inductor, a second power inductor, a third power inductor, an auxiliary inductor, a first middle energy storage capacitor, a second middle energy storage capacitor, an output capacitor, an auxiliary capacitor, a first diode, a second diode, a third diode, a first auxiliary diode, a second auxiliary diode and a load;
the positive electrode of the direct current power supply is connected with the first end of the first power inductor, the cathode of the first auxiliary diode, the second end of the first middle energy storage capacitor and the first end of the second middle energy storage capacitor;
the anode of the first auxiliary diode is connected with the anode of the second diode, the first end of the second power inductor, the first end of the auxiliary switching tube and the first end of the power switching tube;
the cathode of the first diode is connected with the cathode of the second diode and the second end of the first power inductor;
the anode of the first diode is connected with the second end of the second power inductor and the first end of the first middle energy storage capacitor;
the second end of the auxiliary switching tube is connected with the first end of the auxiliary inductor;
the first end of the third power inductor is connected with the second end of the second intermediate energy storage capacitor and the anode of the third diode;
the first end of the output capacitor is connected with the cathode of the third diode and the first end of the load;
the negative electrode of the direct current power supply is connected with the second end of the power switch tube, the first end of the auxiliary capacitor, the second end of the third power inductor, the second end of the output capacitor, the anode of the second auxiliary diode and the second end of the load;
the second end of the auxiliary inductor is connected with the second end of the auxiliary capacitor and the cathode of the second auxiliary diode.
Preferably, the first intermediate energy storage capacitor, the second intermediate energy storage capacitor, the output capacitor and the auxiliary capacitor are all electrolytic capacitors;
the first end of the first intermediate energy storage capacitor, the first end of the second intermediate energy storage capacitor, the first end of the output capacitor and the first end of the auxiliary capacitor are all positive ends;
the second end of the first middle energy storage capacitor, the second end of the second middle energy storage capacitor, the second end of the output capacitor and the second end of the auxiliary capacitor are negative terminals.
Preferably, the power switch tube and the auxiliary switch tube are both NMOS tubes.
The power switch tube and the auxiliary switch tube have first ends which are source electrodes of the NMOS tube, and second ends which are drain electrodes of the NMOS tube.
The technical scheme shows that the implementation of the invention has the following beneficial effects:
compared with the traditional boost converter, the boost converter has higher voltage gain, can realize zero-voltage zero-current conversion of the switching tube, reduces the switching loss of the switching tube, and improves the efficiency of the boost converter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following brief descriptions are provided for the drawings required in the prior art and the embodiments, and the following drawings are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a topology diagram of an embodiment of a delta-shaped impedance network soft switching high gain boost converter of the present invention;
2-11 are diagrams of the main operation modes of the circuit topology of the present invention in one switching period; wherein: fig. 2 is a topological structure diagram of the operation mode 1;
fig. 3 is a topological structure diagram of the operation mode 2;
fig. 4 is a topological structure diagram of the working mode 3;
FIG. 5 is a topological structure diagram of the working mode 4;
FIG. 6 is a topological structure diagram of the working modality 5;
FIG. 7 is a topological structure diagram of an operating modality 6;
fig. 8 is a topological structure diagram of the operation mode 7;
FIG. 9 is a topological structure diagram of the working modality 8;
FIG. 10 is a topological structure diagram of the working modality 9;
fig. 11 is a topological structure diagram of the operation mode 10.
In the figure, a solid line indicates a part through which current flows in the converter, and a broken line indicates a part through which no current flows in the converter;
wherein: v g For input of DC power, S 1 Is a power switch tube, S 2 For auxiliary switching tube, D 1 Is a first diode, D 2 Is a second diode, D 3 Is a third diode, D r1 Is a first auxiliary diode, D r2 Is a second auxiliary diode, C 1 Is a first intermediate energy-storage capacitor, C 2 A second intermediate energy storage capacitor, C 3 To output electricityContainer C r2 Is an auxiliary capacitor, L 1 Is a first power inductor, L 2 Is a second power inductor, L 3 Is a third power inductor, L r Is an auxiliary inductor.
Detailed Description
The invention discloses a field-shaped impedance network soft switch high-gain boost converter, wherein the voltage gain of the field-shaped impedance network boost converter is D/(1-D) 2 Compared with the traditional boost converter, the voltage gain of the field impedance network boost converter is improved. The power circuit mainly comprises a power switch tube, an auxiliary switch tube, three power inductors, an auxiliary inductor, two middle energy storage capacitors, an output capacitor, an auxiliary capacitor, three diodes and two auxiliary diodes. Compared with a traditional booster circuit, the field-shaped impedance network soft switching high-gain boost converter provided by the text can realize zero-voltage zero-current switching-on and switching-off of the main switching tube and the auxiliary switching tube while realizing expansion of output voltage gain, is low in loss and high in transmission efficiency, and has rich applicability and practical value.
In order to make the objects, technical solutions and features of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Power switch tube S of the invention 1 And an auxiliary switching tube S 2 Taking N-channel field effect transistor as an example, in practical application, a user can select the corresponding power switch transistor S according to practical requirements 1 And an auxiliary switching tube S 2 The invention is not limited herein.
To facilitate understanding, referring to fig. 1, the present invention provides an embodiment of a delta-shaped impedance network soft-switching high-gain boost converter, including: DC power supply V g Power switch tube S 1 Auxiliary switch tube S 2 A first diode D 1 A second diode D 2 A third diode D 3 A first auxiliary diode D r1 A second auxiliary diode D r2 A first intermediate energy storage capacitor C 1 A second intermediate energy storage capacitor C 2 An output capacitor C 3 And an auxiliary capacitor C r2 A first power inductor L 1 A second power inductor L 2 A third power inductor L 3 And an auxiliary inductor L r A load R;
the DC power supply V g And the first power inductor L 1 First terminal of, the first auxiliary diode D r1 Of said first intermediate energy-storage capacitor C 1 And a second terminal of said second intermediate energy-storage capacitor C 2 Is connected;
the first auxiliary diode D r1 And the second diode D 2 The anode of (2), the second power inductor L 2 First end of, the auxiliary switching tube S 2 First terminal of and the power switch tube S 1 Is connected;
the first diode D 1 And the second diode D 2 And the first power inductor L 1 Is connected with the second end of the first end;
the first diode D 1 And the second power inductor L 2 And said first intermediate energy-storage capacitor C 1 Is connected with the first end of the first connecting pipe;
the auxiliary switch tube S 2 And the second terminal of the auxiliary inductor L r Is connected;
the third power inductor L 3 First end of and the second intermediate energy-storage capacitor C 2 Second terminal and third diode D 3 The anode of (2) is connected;
the output capacitor C 3 First terminal of and the third diode D 3 Is connected to a first end of the load R;
the DC power supply V g And the powerSwitch tube S 1 Second terminal of, said auxiliary capacitance C r2 The first terminal of (1), the third power inductance L 3 Second terminal of, said output capacitor C 3 Second terminal of, the second auxiliary diode D r2 Is connected to a second end of the load R;
the auxiliary inductor L r And the second end of the auxiliary capacitor and the second auxiliary diode D r2 Is connected to the cathode.
It should be noted that, in the embodiment of the present invention, a delta-shaped impedance network soft switching high-gain boost converter switches a transistor S according to power 1 And an auxiliary switching tube S 2 And the off state is divided into 10 working modes, specifically referring to fig. 2 to 11, and the dotted line portion in fig. 2 to 11 is a non-working portion, which may be regarded as not present. The working principle of the soft-switching high-gain boost converter of the impedance network shaped like a Chinese character tian in the embodiment of the invention can be described as follows:
the working mode 1 is shown in fig. 2:
power switch tube S 1 And an auxiliary switching tube S 2 Turn off, in the main circuit, the first diode D 1 Off, the second diode D 2 And a third diode D 3 On, the first power inductor L 1 A second power inductor L 2 A third power inductor L 3 In the discharging state, the first intermediate energy storage capacitor C 1 A second intermediate energy storage capacitor C 2 An output capacitor C 3 In an energy storage state; in the auxiliary circuit, an auxiliary capacitor C r2 An increase in voltage of (c);
in this working mode, the relationship of the relevant electrical parameters is:
V L1 ＝V O +V C2 -V C1 -V g (1)
V L2 ＝V C1 (2)
V L3 ＝V O (3)
wherein, V L1 Representing the first power inductance L 1 Voltage across, V, in this mode of operation L2 Representing the second power inductance L 2 Voltage across, V, in this mode of operation L3 Representing the third power inductance L 3 Voltage across terminals, V, in this mode of operation O Representing the output voltage.
The working mode 2 is shown in fig. 3:
auxiliary switch tube S 2 Is conducted due to the auxiliary switch tube S 2 And an auxiliary inductance L r In series, and i Lr (t) =0, so the auxiliary switch tube S 2 And zero-voltage zero-current switching-on is realized. In this mode, the resonant network is formed by an auxiliary inductance L r And an auxiliary capacitor C r2 Auxiliary switch tube S 2 A second intermediate energy storage capacitor C 2 An output capacitor C 3 A third power inductor L 3 Composition u Cr2 The resonance starts to increase. Due to the generation of a reverse current, the third diode D 3 The current of (c) will decrease accordingly.
The working mode 3 is shown in fig. 4:
first auxiliary diode D r1 A second auxiliary diode D r2 Conducting auxiliary inductor L r Subject to a forward voltage, i Lr And linearly increases.
Mode of operation 4 is shown in fig. 5:
power switch tube S 1 Is turned on because of the power switch tube S 1 And a third diode D 3 Are simultaneously turned on, so i Lr The linearity decreases.
The working mode 5 is shown in fig. 6:
power switch tube S 1 Is turned off by the body diode of Lr Continuously reduced, second auxiliary diode D r2 Turn-off, auxiliary switching tube S 2 The body diode of (2) is turned on. In this mode, the resonant network is formed by an auxiliary inductor L r And an auxiliary capacitor C r2 Auxiliary switch tube S 2 The body diode of (1).
The working mode 6 is shown in fig. 7:
power switch tube S 1 On, first and secondPolar tube D 1 Conducting, second diode D 2 A third diode D 3 A first auxiliary diode D r1 A second auxiliary diode D r2 Off, the first power inductor L 1 A second power inductor L 2 And a third power inductor L 3 In the energy storage state, a first intermediate energy storage capacitor C 1 A second intermediate energy storage capacitor C 2 And an output capacitor C 3 In a discharging state;
in this working mode, the relationship of the relevant electrical parameters is:
V′ L1 ＝V g +V C1 (4)
V′ L2 ＝V g (5)
V′ L3 ＝V C2 (6)
wherein, V g Represents a DC power supply voltage, V' L1 Representing the first power inductance L 1 Voltage across, V 'in this operating mode' L2 Representing the second power inductance L 2 Voltage across, V 'in this operating mode' L3 Representing the third power inductance L 3 Voltage across, V, in this mode of operation C1 Representing a first intermediate energy-storage capacitor C 1 Voltage across, V C2 Representing a second intermediate energy-storage capacitor C 2 The voltage across.
The working mode 7 is shown in fig. 8:
power switch tube S 1 Auxiliary switch tube S 2 Conducting, the resonant network being formed by an auxiliary inductor L r And an auxiliary capacitor C r2 Power switch tube S 1 And an auxiliary switching tube S 2 And (4) forming. i.e. i Lr The resonance increases from zero.
The working mode 8 is shown in fig. 9:
power switch tube S 1 The body diode of (1) is conducted, and the resonant network is composed of an auxiliary inductor L r And an auxiliary capacitor C r2 Auxiliary switch tube S 2 And a power switch tube S 1 The body diode of (1).
The working mode 9 is shown in fig. 10:
power switch tubeS 1 The body diode of (1) is turned off, and the auxiliary switch tube S 2 The body diode of (1) is conducted, and the resonant network is composed of an auxiliary inductor L r Power switch tube S 1 Parasitic capacitance C of r1 And an auxiliary capacitor C r2 And an auxiliary switching tube S 2 The body diode of (1) and a power switch tube S 1 Parasitic capacitance C of r1 In a discharge state, i Lr And U Cr2 Descending, U Cr1 The resonance increases.
The working mode 10 is shown in fig. 11:
auxiliary switch tube S 2 Turn-off of the body diode of the power switch tube S 1 Parasitic capacitance C of r1 And is in an energy storage state.
And (3) analyzing voltage gain when the converter works stably:
setting the switching period of the switch tube as T S Duty cycle D, i.e. duration of mode 6 of operation DT S With a working mode 1 of duration (1-D) T S . According to the voltage-second balance characteristic of the inductance, the following can be obtained:
V′ L1 DT S ＝V L1 (1-D)T S (7)
V′ L2 DT S ＝V L2 (1-D)T S (8)
V′ L3 DT S ＝V L3 (1-D)T S (9)
the joint type (1) to formula (6) can be obtained:
V C1 ＝DV g /(1-D) (10)
V C2 ＝DV g /(1-D) (11)
V O ＝DV g /(1-D) 2 (12)
therefore, the voltage gain M of the field-shaped impedance network soft switching high-gain boost converter is as follows:
M＝V O /V g ＝D/(1-D) 2
in the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.
Claims (6)
1. A field-shaped impedance network soft switching high-gain boost converter is characterized by comprising: the direct-current power supply comprises a direct-current power supply, a power switch tube, an auxiliary switch tube, a first power inductor, a second power inductor, a third power inductor, an auxiliary inductor, a first middle energy storage capacitor, a second middle energy storage capacitor, an output capacitor, an auxiliary capacitor, a first diode, a second diode, a third diode, a first auxiliary diode, a second auxiliary diode and a load;
the positive electrode of the direct current power supply is connected with the first end of the first power inductor, the cathode of the first auxiliary diode, the second end of the first middle energy storage capacitor and the first end of the second middle energy storage capacitor;
the anode of the first auxiliary diode is connected with the anode of the second diode, the first end of the second power inductor, the first end of the auxiliary switching tube and the first end of the power switching tube;
the cathode of the first diode is connected with the cathode of the second diode and the second end of the first power inductor;
the anode of the first diode is connected with the second end of the second power inductor and the first end of the first middle energy storage capacitor;
the second end of the auxiliary switching tube is connected with the first end of the auxiliary inductor;
the first end of the third power inductor is connected with the second end of the second intermediate energy storage capacitor and the anode of the third diode;
the first end of the output capacitor is connected with the cathode of the third diode and the first end of the load;
the negative electrode of the direct current power supply is connected with the second end of the power switch tube, the first end of the auxiliary capacitor, the second end of the third power inductor, the second end of the output capacitor, the anode of the second auxiliary diode and the second end of the load;
the second end of the auxiliary inductor is connected with the second end of the auxiliary capacitor and the cathode of the second auxiliary diode.
2. The delta-shaped impedance network soft-switching high-gain boost converter according to claim 1, wherein the voltage gain is D/(1-D) 2 When the duty ratio of the power switch tube is 0.75, the gain of the output voltage is 12 times of the input voltage.
3. The delta-type impedance network soft-switching high-gain boost converter according to claim 1, wherein the input impedance is a delta-type network, and is composed of said first diode, said second diode, said first auxiliary diode, said first power inductor, said second power inductor, and said first intermediate energy-storage capacitor.
4. The delta-shaped impedance network soft-switching high-gain boost converter according to claim 1, wherein an auxiliary network composed of the first auxiliary diode, the second auxiliary diode, the auxiliary switching tube, the auxiliary capacitor and the auxiliary inductor enables the power switching tube to realize zero-voltage zero-current conversion, and reduces switching loss of the power switching tube.
5. The field-type impedance network soft-switching high-gain boost converter according to claim 1, wherein the auxiliary switching tube is switched twice in one cycle, and zero-voltage zero-current conversion is realized in both switching processes, so that the switching loss of the auxiliary switching tube is reduced.
6. The delta-shaped impedance network soft-switching high-gain boost converter according to claim 1, wherein said first intermediate energy-storage capacitor, said second intermediate energy-storage capacitor, said output capacitor, and said auxiliary capacitor are electrolytic capacitors;
the first end of the first intermediate energy storage capacitor, the first end of the second intermediate energy storage capacitor, the first end of the output capacitor and the first end of the auxiliary capacitor are all positive ends;
the second end of the first middle energy storage capacitor, the second end of the second middle energy storage capacitor, the second end of the output capacitor and the second end of the auxiliary capacitor are all negative ends.
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| Publication number | Publication date |
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| CN114726215A (en) | 2022-07-08 |
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