Power supply circuit and charging pile

Abstract

The utility model discloses a power supply circuit and a charging pile, and relates to the technical field of charging piles. The power supply circuit comprises a rectification filter circuit, a voltage transformation circuit, a voltage feedback circuit and a control circuit. The rectifying and filtering circuit can rectify and filter an alternating current power supply input by the input interface so as to convert the alternating current power supply into a first direct current power supply and output the first direct current power supply. The voltage transformation circuit can convert the first direct-current power supply into a charging power supply and then output the charging power supply. The voltage feedback circuit can output a feedback signal according to the charging power supply. The control circuit can adjust the voltage transformation work of the voltage transformation circuit according to the feedback signal. Therefore, the conversion from the alternating current power supply to the charging power supply can be realized, the output interface can output the stable charging power supply to charge the charging equipment, the circuit is simple and stable to realize, and the cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, and in particular to a power supply circuit and a charging pile. Background Art

[0002] With the progress of society, new energy electric vehicles are gradually entering thousands of households. New energy electric vehicles need to be charged through charging piles. Among them, the power supply circuit is the core circuit component of the charging pile, which is directly related to the performance, safety and reliability of the charging pile.

[0003] However, the circuit implementation of existing power supply circuits is mostly complex, the circuit stability is poor and the cost is high. Utility Model Content

[0004] The main purpose of the utility model is to provide a power supply circuit, aiming to solve the problems of the existing power supply circuit being relatively complex, poor in stability and high in cost.

[0005] To achieve the above object, the power supply circuit proposed in the utility model is applied to a charging pile, the charging pile includes an input interface and an output interface, and the power supply circuit includes:

[0006] A rectifier and filter circuit, wherein the input end of the rectifier and filter circuit is connected to the input interface, and the rectifier and filter circuit is used to rectify and filter the AC power input by the input interface, so as to convert the AC power into a first DC power and then output it;

[0007] A transformer circuit, wherein the input end of the transformer circuit is connected to the output end of the rectifier and filter circuit, the output end of the transformer circuit is connected to the output interface, and the transformer circuit is used to convert the first DC power supply into a charging power supply for output;

[0008] a voltage feedback circuit, wherein an input end of the voltage feedback circuit is connected to an output end of the voltage conversion circuit, and the voltage feedback circuit is used to output a feedback signal according to the charging power supply;

[0009] A control circuit is connected to the voltage conversion circuit and the voltage feedback circuit respectively, and is used to control the operation of the voltage conversion circuit according to the feedback signal.

[0010] In one embodiment, the rectifier and filter circuit includes a rectifier chip, a first inductor and a first capacitor;

[0011] Among them, the first input end of the rectifier chip is connected to the first end of the input interface, and the second input end of the rectifier chip is connected to the second end of the input interface; the first output end of the rectifier chip, one end of the first inductor and one end of the first capacitor are connected; the second output end of the rectifier chip and the other end of the first capacitor are grounded; the other end of the first inductor is connected to the output end of the rectifier and filter circuit.

[0012] In one embodiment, the voltage conversion circuit includes a transformer, a first input end of the transformer is connected to an input end of the rectifier and filter circuit, and a second input end of the transformer is connected to the control circuit; a first output end of the transformer is connected to a first end of the output interface, and a second output end of the transformer is connected to a second end of the output interface.

[0013] In one embodiment, the voltage feedback circuit includes a first power supply input terminal, a photocoupler, a voltage reference diode and a first resistor; the first input terminal of the photocoupler is connected to the output terminal of the voltage transformer circuit, the second input terminal of the photocoupler is connected to the cathode of the voltage reference diode, the first output terminal of the photocoupler is connected to the control circuit, and the second output terminal of the photocoupler is grounded; the anode of the voltage reference diode is connected to one end of the first resistor, and the reference electrode of the voltage reference diode and the other end of the first resistor are connected to the first power supply input terminal.

[0014] In one embodiment, the transformer circuit also includes a second resistor, a second capacitor and a first diode; the cathode of the first diode is connected to the first input terminal of the transformer; the anode of the first diode and one end of the second resistor are connected to one end of the second capacitor; the other end of the second resistor and the other end of the second capacitor are connected to the second input terminal of the transformer.

[0015] In one embodiment, the transformer circuit also includes a third resistor, a third capacitor and a second diode; one end of the third resistor and the cathode of the second diode are connected to the second output end of the transformer; the other end of the third resistor is connected to one end of the third capacitor; the other end of the third capacitor and the anode of the second diode are connected to the second end of the output interface.

[0016] In one embodiment, the voltage feedback circuit also includes a fourth resistor, a fifth resistor, a sixth resistor and a fourth capacitor; one end of the fourth resistor is connected to the first input end of the photocoupler; the other end of the fourth resistor and one end of the fifth resistor are connected to the second input end of the photocoupler; the other end of the fifth resistor and one end of the fourth capacitor are connected to the cathode of the voltage reference diode; the other end of the fourth capacitor and one end of the sixth resistor are connected to the reference electrode of the voltage reference diode; the other end of the sixth resistor is connected to the first power supply input end.

[0017] In one embodiment, the control circuit includes a control chip and a fifth capacitor, the OC1 pin, OC2 pin, OC3 pin and OC4 pin of the control chip are all connected to the transformer circuit; the FB pin of the control chip is connected to the voltage feedback circuit; the VDD pin of the control chip is connected to one end of the fifth capacitor; and the GND pin of the control chip is connected to the other end of the fifth capacitor.

[0018] In one embodiment, the rectifier chip includes a seventh resistor, an eighth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first common-mode inductor, a second common-mode inductor, a first fuse, a third diode, a fourth diode, a fifth diode and a sixth diode;

[0019] Among them, one end of the seventh resistor is connected to the first end of the input interface, and the other end of the seventh resistor is connected to the first input end of the first common-mode inductor; the second input end of the first common-mode inductor is connected to one end of the first fuse, and the other end of the first fuse is connected to the second end of the input interface; the first output end of the first common-mode inductor, one end of the eighth resistor, and one end of the sixth capacitor are connected to the first input end of the second common-mode inductor; the second output end of the first common-mode inductor, the other end of the eighth resistor, and the other end of the sixth capacitor are connected to the second input end of the second common-mode inductor; the first output end of the second common-mode inductor, one end of the seventh capacitor, and the cathode of the third diode are connected to the anode of the fourth diode; the second output end of the second common-mode inductor, the other end of the seventh capacitor, and the cathode of the sixth diode are connected to the anode of the fifth diode; the anode of the third diode, the anode of the sixth diode, and the cathode of the eighth capacitor are grounded; the cathode of the fourth diode, the cathode of the fifth diode, and the anode of the eighth capacitor are connected to the first output end of the rectifier chip.

[0020] The utility model also provides a charging pile, which includes the power supply circuit as described above.

[0021] The technical solution of the utility model adopts a power supply circuit, which is applied to a charging pile. The charging pile includes an input interface and an output interface. The power supply circuit includes a rectifier and filter circuit, a transformer circuit, a voltage feedback circuit and a control circuit. Among them, the rectifier and filter circuit can rectify and filter the AC power input by the input interface to convert the AC power into a first DC power and then output it. The transformer circuit can convert the first DC power into a charging power and then output it. The voltage feedback circuit can output a feedback signal based on the charging power. The control circuit can adjust the transformer operation of the transformer circuit based on the feedback signal. In this way, the utility model can realize the conversion from AC power to charging power, and the output interface can output a stable charging power to charge the charging device. The circuit is simple and stable to implement, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an embodiment of a power supply circuit provided by the utility model;

[0024] Figure 2 An electronic circuit diagram of a rectifier and filter circuit of an embodiment of a power supply circuit provided by the utility model;

[0025] Figure 3 An electronic circuit diagram of another embodiment of the power supply circuit provided by the utility model;

[0026] Figure 4 This is an electronic circuit diagram of a rectifier chip of an embodiment of a power circuit provided by the utility model.

[0027] Description of Figure Numbers:

[0028]

[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] The circuit implementation of existing power supply circuits is mostly complex, the circuit stability is poor and the cost is high.

[0034] The utility model provides a power supply circuit.

[0035] See also Figure 1 In one embodiment of the utility model, the power supply circuit is applied to a charging pile, the charging pile includes an input interface and an output interface, and the power supply circuit includes:

[0036] A rectifier and filter circuit 01, wherein the input end of the rectifier and filter circuit 01 is connected to the input interface, and the rectifier and filter circuit 01 is used to rectify and filter the AC power input from the input interface, so as to convert the AC power into a first DC power and then output it;

[0037] The transformer circuit 02, the input end of the transformer circuit 02 is connected to the output end of the rectifier and filter circuit 01, the output end of the transformer circuit 02 is connected to the output interface, and the transformer circuit 02 is used to convert the first DC power supply into a charging power supply and then output it;

[0038] A voltage feedback circuit 03, wherein the input end of the voltage feedback circuit 03 is connected to the output end of the voltage transformation circuit 02, and the voltage feedback circuit 03 is used to output a feedback signal according to the charging power supply;

[0039] The control circuit 04 is connected to the voltage transformation circuit 02 and the voltage feedback circuit 03 respectively. The control circuit 04 is used to control the operation of the voltage transformation circuit 02 according to the feedback signal.

[0040] In this embodiment, the rectifier and filter circuit 01 may include components such as a rectifier bridge, a capacitor and a resistor, and may rectify and filter the AC power inputted by the input interface to convert the AC power into a first DC power and then output it. The transformer circuit 02 may include components such as a transformer T, a rectifier diode and a voltage regulator, and may convert the first DC power into a charging power and then output it. The voltage feedback circuit 03 may include components such as a voltage divider, an operational amplifier, and a comparator, and may output a feedback signal according to the charging power outputted by the transformer circuit 02. The control circuit 04 may include a control chip U2 with multiple built-in switch tubes, and may adjust the transformer operation of the transformer circuit 02 according to the feedback signal. For example, a 12V charging voltage is preset to be outputted. When the output charging voltage is greater than 12V, the switching frequency of the multiple switch tubes is adjusted to reduce the voltage conversion capability of the transformer circuit, so that the output voltage becomes smaller; when the output charging voltage is less than 12V, the switching frequency of the multiple switch tubes is adjusted to increase the voltage conversion capability of the transformer circuit, so that the output voltage becomes larger, and finally the output of the transformer circuit 02 is stabilized at 12V. In this way, this embodiment can realize the conversion from AC power to charging power, and the output interface can output the charging power to charge the charging device. The circuit is simple and stable to realize, and the cost is low.

[0041] In the utility model, the rectifier and filter circuit 01 can rectify and filter the AC power input by the input interface to convert the AC power into a first DC power and then output it. The transformer circuit 02 can convert the first DC power into a charging power and then output it. The voltage feedback circuit 03 can output a feedback signal according to the charging power. The control circuit 04 can adjust the transformer operation of the transformer circuit 02 according to the feedback signal. In this way, the utility model can realize the conversion from AC power to charging power, and the output interface can output a stable charging power to charge the charging device. The circuit is simple and stable to realize, and the cost is low.

[0042] See also Figure 2 In one embodiment of the utility model, the rectifier filter circuit 01 includes a rectifier chip U1, a first inductor L1 and a first capacitor C1 (the first capacitor C1 in the figure is composed of a first sub-capacitor C1A, a second sub-capacitor C1B and a third sub-capacitor C1C connected in parallel);

[0043] Among them, the first input end of the rectifier chip U1 is connected to the first end of the input interface, and the second input end of the rectifier chip U1 is connected to the second end of the input interface; the first output end of the rectifier chip U1 and one end of the first inductor L1 are connected to one end of the first capacitor C1; the second output end of the rectifier chip U1 and the other end of the first capacitor C1 are grounded; the other end of the first inductor L1 is connected to the output end of the rectifier filter circuit 01.

[0044] In this embodiment, the AC power is input through the first input terminal and the second input terminal of the rectifier chip U1, and the rectifier chip U1 can convert the input AC power into a first DC power and transmit it to the output terminal. Among them, the first inductor L1 and the first capacitor C1 form a filtering structure, which can help remove the power ripple in the DC power supply, making the output power more stable. In this way, this embodiment can realize the output after converting the AC power into the first DC power, and the circuit is simple and stable.

[0045] It should be noted that a first relay may be provided between the first input end of the rectifier chip U1 and the first end of the input interface, and a second relay may be provided between the second input end of the rectifier chip U1 and the second end of the input interface, and the controller of the charging pile may control the on / off of the path between the input interface and the rectifier chip U1 through the first relay and the second relay. The charging pile may also include an emergency stop circuit, which controls the first relay and the second relay to shut off the path between the input interface and the rectifier chip U1 in an emergency to ensure charging safety.

[0046] See also Figure 3 In one embodiment of the utility model, the transformer circuit 02 includes a transformer T, a first input end of the transformer T is connected to the input end of the rectifier and filter circuit 01, and a second input end of the transformer T is connected to the control circuit 04; a first output end of the transformer T is connected to the first end of the output interface, and a second output end of the transformer T is connected to the second end of the output interface.

[0047] In this embodiment, when the input end of the transformer T receives the first DC power supply of the rectifier filter circuit 01, based on the principle of electromagnetic induction, the power supply is transmitted to the output end through the iron core of the transformer T, and the charging power supply is output at the output end. Among them, the control circuit 04 can adjust the operation of the transformer T, for example, by adjusting the winding of the transformer T or using a switching power supply controller to change the strength of the magnetic field, thereby adjusting the size of the output charging power supply. In this way, this embodiment can convert the first DC power supply into a charging power supply and then output it, and the circuit implementation is simple and stable.

[0048] See also Figure 3In one embodiment of the utility model, the voltage feedback circuit 03 includes a first power input terminal, a photocoupler U3, a voltage reference diode U4 and a first resistor R1; the first input terminal of the photocoupler U3 is connected to the output terminal of the transformer circuit 02, the second input terminal of the photocoupler U3 is connected to the cathode of the voltage reference diode U4, the first output terminal of the photocoupler U3 is connected to the control circuit 04, and the second output terminal of the photocoupler U3 is grounded; the anode of the voltage reference diode U4 is connected to one end of the first resistor R1, and the reference electrode of the voltage reference diode U4 and the other end of the first resistor R1 are connected to the first power input terminal.

[0049] In this embodiment, a circuit composed of the first power input terminal, the voltage reference diode U4 and the first resistor R1 can provide a reference voltage, wherein the first power input terminal can input a 12V power voltage. When the charging power voltage outputted from the output terminal of the transformer circuit 02 changes, the power voltage outputted between the first input terminal and the second input terminal of the photocoupler U3 also changes, and the feedback signal outputted by the photocoupler U3 also changes. The control circuit 04 can adjust the operation of the transformer circuit 02 according to the change of the feedback signal to ensure that the transformer circuit 02 outputs a stable charging power supply. In this way, the present embodiment can output a feedback signal according to the charging power supply to adjust the output of the charging power supply according to the feedback signal, and the circuit is simple and stable to implement.

[0050] See also Figure 3 In one embodiment of the utility model, the transformer circuit 02 also includes a second resistor R2 (the second resistor R2 in the figure can be composed of a first sub-resistor R2A and a second sub-resistor R2B connected in parallel), a second capacitor C2 and a first diode D1; the cathode of the first diode D1 is connected to the first input end of the transformer T; the anode of the first diode D1 and one end of the second resistor R2 are connected to one end of the second capacitor C2; the other end of the second resistor R2 and the other end of the second capacitor C2 are connected to the second input end of the transformer T.

[0051] In this embodiment, the circuit formed by the second resistor R2, the second capacitor C2 and the first diode D1 can play the role of voltage stabilization and filtering, and can help generate a more stable charging power supply.

[0052] See also Figure 3 In one embodiment of the utility model, the transformer circuit 02 also includes a third resistor R3, a third capacitor C3 and a second diode D2; one end of the third resistor R3 and the cathode of the second diode D2 are connected to the second output end of the transformer T; the other end of the third resistor R3 is connected to one end of the third capacitor C3; the other end of the third capacitor C3 and the anode of the second diode D2 are connected to the second end of the output interface.

[0053] In this embodiment, the circuit formed by the third resistor R3, the third capacitor C3 and the second diode D2 can play the role of voltage stabilization and filtering, and can help output a more stable charging power supply.

[0054] See also Figure 3 In one embodiment of the utility model, the voltage feedback circuit 03 also includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 (the sixth resistor R6 in the figure is composed of a third sub-resistor R6A and a fourth sub-resistor R6B connected in parallel) and a fourth capacitor C4; one end of the fourth resistor R4 is connected to the first input end of the photoelectric coupler U3; the other end of the fourth resistor R4 and one end of the fifth resistor R5 are connected to the second input end of the photoelectric coupler U3; the other end of the fifth resistor R5 and one end of the fourth capacitor C4 are connected to the cathode of the voltage reference diode U4; the other end of the fourth capacitor C4 and one end of the sixth resistor R6 are connected to the reference electrode of the voltage reference diode U4; the other end of the sixth resistor R6 is connected to the first power supply input end.

[0055] In this embodiment, the circuit formed by the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the fourth capacitor C4 can be used for voltage division and filtering, which can help generate a more stable feedback signal.

[0056] See also Figure 3 In one embodiment of the utility model, the control circuit 04 includes a control chip U2 and a fifth capacitor C5, the OC1 pin, OC2 pin, OC3 pin and OC4 pin of the control chip U2 are all connected to the transformer circuit 02; the FB pin of the control chip U2 is connected to the voltage feedback circuit 03; the VDD pin of the control chip U2 is connected to one end of the fifth capacitor C5; and the GND pin of the control chip U2 is connected to the other end of the fifth capacitor C5.

[0057] In this embodiment, the control chip U2 does not need to be connected to an additional working voltage to provide the power required by the control chip U2. The control chip U2 can obtain the power required for the work from the DC power supply input from the OC1 pin, the OC2 pin, the OC3 pin, and the OC4 pin. The fifth capacitor C5 is the power filter capacitor of the control chip U2, which can provide a more stable working voltage to the control chip U2. In this embodiment, the control chip U2 can be built with multiple switch tubes, and the multiple switch tubes are respectively connected to the OC1 pin, the OC2 pin, the OC3 pin, and the OC4 pin. The control chip U2 can adjust the voltage conversion work of the voltage conversion circuit 02 by controlling the on / off of the built-in multiple switch tubes. Among them, the FB pin of the control chip U2 receives a feedback signal and controls the on / off of the multiple switch tubes according to the feedback signal. In this way, the work of the control chip U2 in this embodiment does not require the connection of an additional working voltage, and the cost is low. Moreover, this embodiment has feedback regulation, and the output charging power is relatively stable.

[0058] See also Figure 4 In one embodiment of the utility model, the rectifier chip U1 includes a seventh resistor R7, an eighth resistor R8, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a first common-mode inductor L2, a second common-mode inductor L3, a first fuse F1, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6;

[0059] Among them, one end of the seventh resistor R7 is connected to the first end of the input interface, and the other end of the seventh resistor R7 is connected to the first input end of the first common-mode inductor L2; the second input end of the first common-mode inductor L2 is connected to one end of the first fuse F1, and the other end of the first fuse F1 is connected to the second end of the input interface; the first output end of the first common-mode inductor L2, one end of the eighth resistor R8, and one end of the sixth capacitor C6 are connected to the first input end of the second common-mode inductor L3; the second output end of the first common-mode inductor L2, the other end of the eighth resistor R8, and the other end of the sixth capacitor C6 are connected to the second common-mode inductor L3 The second input end of the second common-mode inductor L3 is connected; the first output end of the second common-mode inductor L3, one end of the seventh capacitor C7, the cathode of the third diode D3 and the anode of the fourth diode D4 are connected; the second output end of the second common-mode inductor L3, the other end of the seventh capacitor C7, the cathode of the sixth diode D6 and the anode of the fifth diode D5 are connected; the anode of the third diode D3, the anode of the sixth diode D6 and the cathode of the eighth capacitor C8 are grounded; the cathode of the fourth diode D4, the cathode of the fifth diode D5 and the anode of the eighth capacitor C8 are connected to the first output end of the rectifier chip U1.

[0060] In this embodiment, the seventh resistor R7, the eighth resistor R8, the sixth capacitor C6 and the first common mode inductor L2 constitute a first-stage low-pass filter circuit, the second common mode inductor L3 and the seventh capacitor C7 constitute a second-stage low-pass filter circuit, the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 constitute a rectifier bridge, and the first fuse F1 can prevent the circuit from being damaged by overload or short circuit. In this way, this embodiment can rectify and filter the input AC power supply, and convert the AC power supply into the first DC power supply for output, and the power ripple of the output first DC power supply is small.

[0061] The utility model also proposes a charging pile, which includes the power supply circuit as described above. The specific structure of the power supply circuit refers to the above embodiment. Since the charging pile adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0062] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A power supply circuit, characterized in that: The power supply circuit is applied to a charging pile, the charging pile includes an input interface and an output interface, and the power supply circuit includes: A rectifier and filter circuit, wherein the input end of the rectifier and filter circuit is connected to the input interface, and the rectifier and filter circuit is used to rectify and filter the AC power input by the input interface, so as to convert the AC power into a first DC power and then output it; A transformer circuit, wherein the input end of the transformer circuit is connected to the output end of the rectifier and filter circuit, the output end of the transformer circuit is connected to the output interface, and the transformer circuit is used to convert the first DC power supply into a charging power supply for output; a voltage feedback circuit, wherein an input end of the voltage feedback circuit is connected to an output end of the voltage conversion circuit, and the voltage feedback circuit is used to output a feedback signal according to the charging power supply; A control circuit is connected to the voltage conversion circuit and the voltage feedback circuit respectively, and is used to control the operation of the voltage conversion circuit according to the feedback signal.

2. The power supply circuit according to claim 1, characterized in that The rectifier and filter circuit includes a rectifier chip, a first inductor and a first capacitor; Among them, the first input end of the rectifier chip is connected to the first end of the input interface, and the second input end of the rectifier chip is connected to the second end of the input interface; the first output end of the rectifier chip, one end of the first inductor and one end of the first capacitor are connected; the second output end of the rectifier chip and the other end of the first capacitor are grounded; the other end of the first inductor is connected to the output end of the rectifier and filter circuit.

3. The power supply circuit according to claim 1, characterized in that The voltage conversion circuit includes a transformer, a first input end of the transformer is connected to the input end of the rectifier and filter circuit, and a second input end of the transformer is connected to the control circuit; a first output end of the transformer is connected to the first end of the output interface, and a second output end of the transformer is connected to the second end of the output interface.

4. The power supply circuit according to claim 1, characterized in that: The voltage feedback circuit includes a first power supply input terminal, a photoelectric coupler, a voltage reference diode and a first resistor; the first input terminal of the photoelectric coupler is connected to the output terminal of the voltage conversion circuit, the second input terminal of the photoelectric coupler is connected to the cathode of the voltage reference diode, the first output terminal of the photoelectric coupler is connected to the control circuit, and the second output terminal of the photoelectric coupler is grounded; the anode of the voltage reference diode is connected to one end of the first resistor, and the reference electrode of the voltage reference diode and the other end of the first resistor are connected to the first power supply input terminal.

5. The power supply circuit according to claim 3, characterized in that: The voltage transformation circuit also includes a second resistor, a second capacitor and a first diode; the cathode of the first diode is connected to the first input terminal of the transformer; the anode of the first diode and one end of the second resistor are connected to one end of the second capacitor; the other end of the second resistor and the other end of the second capacitor are connected to the second input terminal of the transformer.

6. The power supply circuit according to claim 3, characterized in that: The transformer circuit also includes a third resistor, a third capacitor and a second diode; one end of the third resistor and the cathode of the second diode are connected to the second output end of the transformer; the other end of the third resistor is connected to one end of the third capacitor; the other end of the third capacitor and the anode of the second diode are connected to the second end of the output interface.

7. The power supply circuit according to claim 4, characterized in that: The voltage feedback circuit also includes a fourth resistor, a fifth resistor, a sixth resistor and a fourth capacitor; one end of the fourth resistor is connected to the first input end of the photoelectric coupler; the other end of the fourth resistor and one end of the fifth resistor are connected to the second input end of the photoelectric coupler; the other end of the fifth resistor and one end of the fourth capacitor are connected to the cathode of the voltage reference diode; the other end of the fourth capacitor and one end of the sixth resistor are connected to the reference electrode of the voltage reference diode; the other end of the sixth resistor is connected to the first power supply input end.

8. The power supply circuit according to claim 1, wherein: The control circuit includes a control chip and a fifth capacitor, the OC1 pin, OC2 pin, OC3 pin and OC4 pin of the control chip are all connected to the voltage transformer circuit; the FB pin of the control chip is connected to the voltage feedback circuit; the VDD pin of the control chip is connected to one end of the fifth capacitor; and the GND pin of the control chip is connected to the other end of the fifth capacitor.

9. The power supply circuit according to claim 2, characterized in that: The rectifier chip includes a seventh resistor, an eighth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first common-mode inductor, a second common-mode inductor, a first fuse, a third diode, a fourth diode, a fifth diode and a sixth diode; Among them, one end of the seventh resistor is connected to the first end of the input interface, and the other end of the seventh resistor is connected to the first input end of the first common-mode inductor; the second input end of the first common-mode inductor is connected to one end of the first fuse, and the other end of the first fuse is connected to the second end of the input interface; the first output end of the first common-mode inductor, one end of the eighth resistor, and one end of the sixth capacitor are connected to the first input end of the second common-mode inductor; the second output end of the first common-mode inductor, the other end of the eighth resistor, and the other end of the sixth capacitor are connected to the second input end of the second common-mode inductor; the first output end of the second common-mode inductor, one end of the seventh capacitor, and the cathode of the third diode are connected to the anode of the fourth diode; the second output end of the second common-mode inductor, the other end of the seventh capacitor, and the cathode of the sixth diode are connected to the anode of the fifth diode; the anode of the third diode, the anode of the sixth diode, and the cathode of the eighth capacitor are grounded; the cathode of the fourth diode, the cathode of the fifth diode, and the anode of the eighth capacitor are connected to the first output end of the rectifier chip.

10. A charging pile, characterized in that: The charging pile comprises a power supply circuit as claimed in any one of claims 1 to 9.

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