CN114785154A - Power supply circuit and power supply device - Google Patents

Power supply circuit and power supply device Download PDF

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Publication number
CN114785154A
CN114785154A CN202210599076.5A CN202210599076A CN114785154A CN 114785154 A CN114785154 A CN 114785154A CN 202210599076 A CN202210599076 A CN 202210599076A CN 114785154 A CN114785154 A CN 114785154A
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CN
China
Prior art keywords
circuit
power supply
voltage
driving
rectifying
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
CN202210599076.5A
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Chinese (zh)
Inventor
陈东旭
窦笠
吴晓梅
于渤
郭松峰
王旭
冯迪
齐宏亮
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China Tower Co Ltd
Original Assignee
China Tower 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.)
Filing date
Publication date
Application filed by China Tower Co Ltd filed Critical China Tower Co Ltd
Priority to CN202210599076.5A priority Critical patent/CN114785154A/en
Publication of CN114785154A publication Critical patent/CN114785154A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input

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

Abstract

The invention provides a power supply circuit and a power supply device, wherein the power supply circuit comprises a transformer, a switching circuit, a first rectifying circuit and at least one voltage regulating circuit, the voltage regulating circuit comprises a second rectifying circuit and a third rectifying circuit, the transformer comprises a primary coil, a first secondary coil and a second secondary coil corresponding to the voltage regulating circuit; the input end of the switching circuit is connected with an external voltage source, the output end of the switching circuit is coupled with the primary coil, the input end of the first rectifying circuit is connected with the internal voltage source, the output end of the first rectifying circuit is coupled with the first secondary coil, the input end of the voltage regulating circuit is coupled with the corresponding second secondary coil, and the output end of the voltage regulating circuit outputs driving voltage. The power supply circuit can realize the rectification of the input voltage and output the driving voltage only through the two rectification circuits, thereby reducing the complexity of circuit design, reducing the number of components and reducing the manufacturing cost of the power supply circuit.

Description

Power supply circuit and power supply device
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a power supply circuit and a power supply device.
Background
Gallium nitride (GaN) devices are widely used as core semiconductor elements of electronic devices because of their advantages such as low driving loss, low miller effect, and low switching loss.
The existing power supply circuit for supplying power to the GaN switching tube comprises an auxiliary source power supply circuit and a floating drive power supply circuit, wherein the auxiliary source power supply circuit comprises a switching circuit and two rectifying circuits, low voltage is generated through the auxiliary source power supply circuit and is output to the floating drive power supply circuit, and driving voltage for switching on or switching off the GaN switching tube is generated through the floating drive power supply circuit. However, the above power supply circuit has the technical problems of complicated circuit design structure and high manufacturing cost.
Disclosure of Invention
The embodiment of the application aims to provide a power supply circuit and a power supply device, and the technical problems that an existing power supply circuit is complex in design structure and high in manufacturing cost can be solved.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a power supply circuit, where the power supply circuit includes a transformer, a switching circuit, a first rectifying circuit, and at least one voltage regulating circuit, where the voltage regulating circuit includes a second rectifying circuit and a third rectifying circuit, and the transformer includes a primary coil, a first secondary coil, and a second secondary coil corresponding to the voltage regulating circuit;
the input end of the switching circuit is connected with an external voltage source, the output end of the switching circuit is coupled with the primary coil, the input end of the first rectifying circuit is connected with an internal voltage source, the output end of the first rectifying circuit is coupled with the first secondary coil, the input end of the voltage regulating circuit is coupled with the corresponding second secondary coil, and the output end of the voltage regulating circuit outputs a driving voltage;
the first rectifying circuit is used for inhibiting the input voltage of the primary coil coupled to the second secondary coil, and the second rectifying circuit and the third rectifying circuit are used for rectifying the inhibited input voltage and outputting the driving voltage.
In a second aspect, an embodiment of the present application provides a power supply apparatus, which includes a driving circuit, and the power supply circuit according to the first aspect;
the driving circuit is connected with the power supply circuit, a first output end of the driving circuit is connected with a grid electrode of an external switching tube, and a second output end of the driving circuit is connected with a source electrode of the switching tube;
the driving circuit transmits the driving voltage output by the power supply circuit to the switching tube so that the switching tube is in a conducting state or a stopping state.
The power supply circuit comprises a transformer, a switching circuit, a first rectifying circuit and at least one voltage regulating circuit, wherein the voltage regulating circuit comprises a second rectifying circuit and a third rectifying circuit; the input end of the switching circuit is connected with an external voltage source, the output end of the switching circuit is coupled with the primary coil, the input end of the first rectifying circuit is connected with the internal voltage source, the output end of the first rectifying circuit is coupled with the first secondary coil, the input end of the voltage regulating circuit is coupled with the corresponding second secondary coil, and the output end of the voltage regulating circuit outputs driving voltage. The power supply circuit provided by the embodiment of the invention can realize the rectification of the input voltage and output the driving voltage for switching on or switching off the switching tube only through two rectification circuits, and an additional floating drive power supply circuit is not required to be designed, so that the complexity of circuit design is reduced, the number of components is reduced, and the manufacturing cost of the power supply circuit is reduced.
Drawings
Fig. 1 is a circuit diagram of a power supply circuit provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power supply device according to an embodiment of the present application.
Description of the reference numerals:
110. a switching circuit; 120. a first rectifying circuit; 130. a voltage regulation circuit; 131. a second rectifying circuit; 132. a third rectifying circuit; 140. a primary coil; 150. a first secondary coil; 160. a second secondary coil; v1, external voltage source; v2, internal voltage source; 161. a first sub-secondary coil; 162. a second sub-secondary coil; 100. a power supply circuit; 200. a drive circuit; 300. a switching tube; 400. a control unit; r1, a first resistor; r2, a second resistor; C. and (4) a capacitor.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
Referring to fig. 1, fig. 1 is a circuit diagram of a power supply circuit 100 according to an embodiment of the invention. As shown in fig. 1, a power supply circuit 100 according to an embodiment of the present invention includes a transformer, a switching circuit 110, a first rectifying circuit 120, and at least one voltage regulating circuit 130, where the voltage regulating circuit 130 includes a second rectifying circuit 131 and a third rectifying circuit 132, the transformer includes a primary coil 140, a first secondary coil 150, and a second secondary coil 160 corresponding to the voltage regulating circuit 130;
the input end of the switch circuit 110 is connected to an external voltage source V1, the output end of the switch circuit 110 is coupled to the primary coil 140, the input end of the first rectifying circuit 120 is connected to an internal voltage source V2, the output end of the first rectifying circuit 120 is coupled to the first secondary coil 150, the input end of the voltage regulating circuit 130 is coupled to the corresponding second secondary coil 160, and the output end of the voltage regulating circuit 130 outputs a driving voltage.
The power supply circuit 100 provided by the embodiment of the present invention includes a transformer, a switch circuit 110, a first rectifying circuit 120, and at least one voltage regulating circuit 130, where one voltage regulating circuit 130 includes two rectifying circuits, namely a second rectifying circuit 131 and a third rectifying circuit 132. The structures of the switching circuit 110 and the rectifying circuit are common circuit structures, and are not particularly limited herein. While the power supply circuit 100 shown in fig. 1 includes one voltage regulation circuit 130, it should be understood that in other embodiments, the power supply circuit 100 may include two or other numbers of voltage regulation circuits 130.
It should be understood that the voltage regulating circuits 130 correspond to the external switching tubes 300 one by one, and the voltage regulating circuits 130 are configured to output a driving voltage for controlling the switching tubes 300 corresponding to the voltage regulating circuits 130 to be in an on or off state. Alternatively, the switching tube 300 may be a GaN switching tube 300.
The transformer includes a magnetic core, a primary coil 140, a first secondary coil 150, and a second secondary coil 160 corresponding to the voltage regulating circuit 130, as shown in fig. 1, an output terminal of the switching circuit 110 is coupled to the primary coil 140, and an output terminal of the first rectifying circuit 120 is coupled to the first secondary coil 150, wherein a winding direction of the first secondary coil 150 is not identical to a winding direction of the primary coil 140. An input of the voltage regulating circuit 130 is coupled to the second secondary winding 160. In the case where other embodiments include a plurality of voltage regulating circuits 130, the number of second secondary coils 160 is the same as the number of voltage regulating circuits 130.
The working principle of the power supply circuit 100 provided by the embodiment of the invention is as follows: the transformer, the switching circuit 110 and the first rectifying circuit 120 form a flyback converter, an input end of the switching circuit 110 is connected with an external voltage source V1 to receive an input voltage, the first rectifying circuit 120 is used for suppressing the input voltage of the primary coil 140 coupled to the second secondary coil 160, and the second rectifying circuit 131 and the third rectifying circuit 132 are used for rectifying the suppressed input voltage and outputting a driving voltage. The external voltage source V1 may be a Power Factor Correction (PFC) circuit connected to the Power supply circuit 100, and the internal voltage source V2 may be an internal Power source of the Power supply circuit 100.
The power supply circuit 100 in the embodiment of the present invention includes a transformer, a switching circuit 110, a first rectifying circuit 120, and at least one voltage regulating circuit 130, the voltage regulating circuit 130 includes a second rectifying circuit 131 and a third rectifying circuit 132, the transformer includes a primary coil 140, a first secondary coil 150, and a second secondary coil 160 corresponding to the voltage regulating circuit 130; the input end of the switch circuit 110 is connected with an external voltage source V1, the output end of the switch circuit 110 is coupled with the primary coil 140, the input end of the first rectifying circuit 120 is connected with an internal voltage source V2, the output end of the first rectifying circuit 120 is coupled with the first secondary coil 150, the input end of the voltage regulating circuit 130 is coupled with the corresponding second secondary coil 160, and the output end of the voltage regulating circuit 130 outputs a driving voltage. The power supply circuit 100 provided by the embodiment of the invention can realize the rectification of the input voltage by only two rectification circuits, and output the driving voltage for switching on or switching off the switching tube 300 without designing an additional floating drive power supply circuit 100, so that the complexity of circuit design is reduced, the number of components is reduced, and the manufacturing cost of the power supply circuit 100 is reduced.
Optionally, a first output terminal of the second rectification circuit 131 is connected to a first output terminal of the third rectification circuit 132.
As shown in fig. 1, the first output terminal of the second rectifying circuit 131 is connected to the first output terminal of the third rectifying circuit 132, and in the case where the power supply circuit 100 is applied to a power supply device, a connection node between the first output terminal of the second rectifying circuit 131 and the first output terminal of the third rectifying circuit 132 is connected to the source of the switching tube 300.
Optionally, the second secondary coil 160 includes a first sub-secondary coil 161 and a second sub-secondary coil 162;
the first sub-secondary coil 161 is coupled to an input of the second rectifying circuit 131, and the second sub-secondary coil 162 is coupled to an input of the third rectifying circuit 132.
As described above, the voltage regulating circuit 130 includes the second rectifying circuit 131 and the third rectifying circuit 132, and in the present embodiment, the second secondary coil 160 includes the first sub-secondary coil 161 and the second sub-secondary coil 162, the first sub-secondary coil 161 is coupled to the input terminal of the second rectifying circuit 131, and the second sub-secondary coil 162 is coupled to the input terminal of the third rectifying circuit 132. Wherein the winding direction of the second secondary coil 160 is identical to the winding direction of the primary coil 140.
Optionally, the second rectifying circuit 131 is configured to rectify the suppressed input voltage, and output the forward driving voltage through a second output terminal.
In this embodiment, the second rectifying circuit 131 rectifies the suppressed input voltage to generate a forward voltage signal, which is referred to as a forward driving voltage, and outputs the forward driving voltage to the switching tube 300 through the second output terminal of the second rectifying circuit 131, so that the switching tube 300 is in a conductive state.
Optionally, the third rectifying circuit 132 is configured to rectify the suppressed input voltage, and output a negative driving voltage through the second output terminal.
In this embodiment, the third rectification circuit 132 rectifies the suppressed input voltage to generate a negative voltage signal, which is referred to as a negative driving voltage, and outputs the negative driving voltage to the switching tube 300 through the second output end of the third rectification circuit 132, so that the switching tube 300 is in an off state.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a power supply device according to an embodiment of the present invention. As shown in fig. 2, the power supply apparatus provided in the embodiment of the present invention includes a driving circuit 200, and the power supply circuit 100 according to the above embodiment;
the driving circuit 200 is connected to the power supply circuit 100, a first output terminal of the driving circuit 200 is connected to a gate of an external switching tube 300, and a second output terminal of the driving circuit 200 is connected to a source of the switching tube 300.
The working principle of the power supply device provided by the embodiment is as follows: the driving circuit 200 transmits the driving voltage output by the power supply circuit 100 to the switching tube 300, so that the switching tube 300 is in a conducting state or a blocking state. The structure of the driving circuit 200 is a common circuit structure, and is not limited in particular.
In an alternative embodiment, the driving circuit 200 applies the forward driving voltage output by the power supply circuit 100 to the gate of the switching tube 300, so that the switching tube 300 is in a conducting state.
In another alternative embodiment, the driving circuit 200 applies a negative driving voltage output by the power supply circuit 100 to the gate of the switching tube 300, so that the switching tube 300 is in an off state.
The power supply device in this embodiment includes the power supply circuit 100 as described above, and since the power supply circuit 100 can rectify the input voltage by only using two rectifying circuits and output the driving voltage for turning on or off the switching tube 300, an additional floating drive power supply circuit 100 does not need to be designed, so that the complexity of circuit design is reduced, the number of components is reduced, and the manufacturing cost of the power supply device is reduced.
Alternatively, a first input terminal of the driving circuit 200 is connected to a second output terminal of the second rectifying circuit 131, a second input terminal of the driving circuit 200 is connected to a second output terminal of the third rectifying circuit 132, and a third input terminal of the driving circuit 200 is connected to a first output terminal of the second rectifying circuit 131 and a first output terminal of the third rectifying circuit 132.
In this embodiment, the driving circuit 200 includes a first input terminal, a second input terminal, and a third input terminal. A first input end of the driving circuit 200 is connected to a second output end of the second rectifying circuit 131, and a first input end of the driving circuit 200 is configured to receive the forward driving voltage transmitted by the second rectifying circuit 131.
A second input end of the driving circuit 200 is connected to a second output end of the third rectifying circuit 132, and the second input end of the driving circuit 200 is configured to receive the negative driving voltage transmitted by the third rectifying circuit 132.
The third input end of the driving circuit 200 is connected to the first output end of the second rectifying circuit 131 and the first output end of the third rectifying circuit 132, so that the connection node between the first output end of the second rectifying circuit 131 and the first output end of the third rectifying circuit 132 is connected to the source of the switching tube 300 through the driving circuit 200.
Optionally, the power supply device further includes a first resistor R1, a first end of the first resistor R1 is electrically connected to the first output end of the driving circuit 200, and a second end of the first resistor R1 is electrically connected to the gate of the switching tube 300.
The power supply device in this embodiment further includes a first resistor R1, the first resistor R1 is disposed between the driving circuit 200 and the switching tube 300, the first resistor R1 is a driving resistor, and the first resistor R1 is used for protecting the switching tube 300.
Optionally, the power supply device further includes a second resistor R2 and a capacitor C;
the first end of the second resistor R2 is electrically connected with the first end of the capacitor C, and the first end of the second resistor R2 is also electrically connected with the second end of the first resistor R1;
the second end of the second resistor R2 is electrically connected to the second end of the capacitor C, and the second end of the second resistor R2 is further electrically connected to the second output terminal of the driving circuit 200.
The power supply device in this embodiment further includes a second resistor R2 and a capacitor C, the second resistor R2 and the capacitor C form a filter circuit, and the filter circuit is disposed between the driving circuit 200 and the switching tube 300, and the filter circuit is configured to filter the driving voltage transmitted by the driving circuit 200.
Optionally, a fourth input terminal of the driving circuit 200 is connected to an external control unit 400.
The control unit 400 may be a single chip computer or other devices capable of running computer programs. The control unit 400 is configured to send a first driving signal or a second driving signal to the driving circuit 200. The first driving signal may be a high level signal with a voltage higher than a preset threshold, and the second driving signal may be a low level signal with a voltage lower than a preset threshold or a signal with a voltage of 0.
In this embodiment, the driving circuit sends a forward driving voltage to the switching tube when receiving the first driving signal, so that the switching tube is in a conducting state. And the driving circuit sends negative driving voltage to the switching tube under the condition of receiving the second driving signal so as to enable the switching tube to be in a cut-off state.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.

Claims (10)

1. A power supply circuit is characterized by comprising a transformer, a switching circuit, a first rectifying circuit and at least one voltage regulating circuit, wherein the voltage regulating circuit comprises a second rectifying circuit and a third rectifying circuit;
the input end of the switch circuit is connected with an external voltage source, the output end of the switch circuit is coupled with the primary coil, the input end of the first rectifying circuit is connected with an internal voltage source, the output end of the first rectifying circuit is coupled with the first secondary coil, the input end of the voltage regulating circuit is coupled with the corresponding second secondary coil, and the output end of the voltage regulating circuit outputs driving voltage;
the first rectifying circuit is used for suppressing the input voltage of the primary coil coupled to the second secondary coil, and the second rectifying circuit and the third rectifying circuit are used for rectifying the suppressed input voltage and outputting a driving voltage.
2. The power supply circuit according to claim 1, wherein the first output terminal of the second rectifying circuit is connected to the first output terminal of the third rectifying circuit.
3. The power supply circuit of claim 1, wherein the second secondary winding comprises a first sub-secondary winding and a second sub-secondary winding;
the first sub-secondary coil is coupled with an input end of the second rectifying circuit, and the second sub-secondary coil is coupled with an input end of the third rectifying circuit.
4. The power supply circuit of claim 1, wherein the second rectifying circuit is configured to rectify the suppressed input voltage and output a forward driving voltage through a second output terminal.
5. The power supply circuit according to claim 1, wherein the third rectifying circuit is configured to rectify the suppressed input voltage and output a negative driving voltage through the second output terminal.
6. A power supply device characterized in that the power supply device comprises a drive circuit, and a power supply circuit according to any one of claims 1 to 5;
the driving circuit is connected with the power supply circuit, a first output end of the driving circuit is connected with a grid electrode of an external switching tube, and a second output end of the driving circuit is connected with a source electrode of the switching tube;
the driving circuit transmits the driving voltage output by the power supply circuit to the switching tube so that the switching tube is in a conducting state or a stopping state.
7. The power supply device according to claim 6, wherein a first input terminal of the driving circuit is connected to a second output terminal of the second rectifying circuit, a second input terminal of the driving circuit is connected to a second output terminal of the third rectifying circuit, and a third input terminal of the driving circuit is connected to a first output terminal of the second rectifying circuit and a first output terminal of the third rectifying circuit.
8. The power supply device according to claim 6, further comprising a first resistor, wherein a first end of the first resistor is electrically connected to the first output terminal of the driving circuit, and a second end of the first resistor is electrically connected to the gate of the switching tube.
9. The power supply device of claim 8, further comprising a second resistor and capacitor;
the first end of the second resistor is electrically connected with the first end of the capacitor, and the first end of the second resistor is also electrically connected with the second end of the first resistor;
the second end of the second resistor is electrically connected with the second end of the capacitor, and the second end of the second resistor is also electrically connected with the second output end of the driving circuit.
10. The power supply device according to claim 6, wherein the fourth input terminal of the driving circuit is connected to an external control unit;
under the condition that the control unit sends a first driving signal to the driving circuit, the driving circuit sends a forward driving voltage to the switching tube so that the switching tube is in a conducting state;
under the condition that the control unit sends a second driving signal to the driving circuit, the driving circuit sends negative driving voltage to the switching tube so that the switching tube is in a cut-off state.
CN202210599076.5A 2022-05-30 2022-05-30 Power supply circuit and power supply device Pending CN114785154A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210599076.5A CN114785154A (en) 2022-05-30 2022-05-30 Power supply circuit and power supply device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210599076.5A CN114785154A (en) 2022-05-30 2022-05-30 Power supply circuit and power supply device

Publications (1)

Publication Number Publication Date
CN114785154A true CN114785154A (en) 2022-07-22

Family

ID=82421955

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210599076.5A Pending CN114785154A (en) 2022-05-30 2022-05-30 Power supply circuit and power supply device

Country Status (1)

Country Link
CN (1) CN114785154A (en)

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