CN211508690U - Direct current supply circuit and charging pile system - Google Patents

Abstract

The utility model provides a direct current supply circuit and fill electric pile system, wherein, direct current supply circuit is through adding two-way electric energy conversion circuit and at least one photovoltaic input port, thereby accessible alternating current and at least one photovoltaic power supply are as input power, and energy storage circuit has been added, thereby realized when certain input power supply disconnection, direct current supply circuit can be by supplying power for each load through other input power supply or energy storage circuit, and through adding two at least voltage conversion circuit, thereby realized can supplying power for the same or different load of a plurality of operating voltage, foretell direct current supply circuit has solved the problem that the power input that exists among the traditional technical scheme is single, the easy interrupt power supply and can't satisfy the power supply demand of the different load of a plurality of operating voltage simultaneously.

Description

DC power supply circuit and charging pile system

technical field

The utility model belongs to the technical field of power supply, in particular to a direct current power supply circuit and a charging pile system.

Background technique

At present, the traditional DC power supply circuit generally has only one power input interface and one output terminal, but this method has a single power input, and the entire circuit cannot continuously supply power to the load when the input power fails, and cannot meet multiple operating voltages at the same time. The power demand of the load.

Therefore, the traditional technical solutions have the problems of single power input, easy interruption of power supply, and inability to meet the power supply requirements of multiple loads with different working voltages at the same time.

Utility model content

In view of this, the embodiment of the present invention provides a DC power supply circuit and a charging pile system, which aims to solve the problems of single power supply input, easy interruption of power supply, and inability to satisfy multiple loads with different working voltages at the same time in the traditional technical solution. the problem of power demand.

A first aspect of the embodiments of the present utility model provides a DC power supply circuit, including:

a bidirectional power conversion circuit, the alternating current end of the bidirectional power conversion circuit is connected to the alternating current, the bidirectional power conversion circuit can convert the alternating current into direct current, and convert the direct current into the alternating current;

At least two voltage conversion circuits, the input end of each voltage conversion circuit is connected to the DC end of the bidirectional power conversion circuit, the output end of each voltage conversion circuit is connected to each load, and each voltage conversion circuit can convert all the The direct current is converted into the corresponding target direct current;

an energy storage circuit, the DC end of the energy storage circuit and the bidirectional power conversion circuit is connected to the input end of the voltage conversion circuit, the energy storage circuit can provide and store the DC power, and output the DC power to the the voltage conversion circuit and the bidirectional power conversion circuit; and

At least one photovoltaic input port, the input end of each photovoltaic input port is respectively connected with a photovoltaic power source, and the output end of each photovoltaic input port is commonly connected to the input end of the energy storage circuit and each of the voltage conversion circuits.

In one embodiment, the bidirectional power conversion circuit includes a bidirectional AC-DC conversion chip and a first driver, and the AC input and output terminals of the bidirectional AC-DC conversion chip serve as the AC terminals of the bidirectional power conversion circuit. The DC input and output terminals of the bidirectional AC-DC conversion chip serve as the DC terminals of the bidirectional power conversion circuit, and the control terminal of the bidirectional AC-DC conversion chip is connected to the output terminal of the first driver.

In one embodiment, the voltage conversion circuit includes a second driver, a first switch tube, a first inductor, a first diode and a first capacitor, and an input end of the first switch tube serves as the voltage conversion circuit The input end of the first switch tube is connected as the first end of the first inductor to the cathode of the first diode, and the second end of the first inductor is connected to the first capacitor The first end of the first capacitor is commonly connected as the output end of the voltage conversion circuit, and the second end of the first capacitor and the anode of the first diode are commonly connected.

In one embodiment, the energy storage circuit includes an energy storage battery pack.

In one embodiment, the energy storage voltage of the energy storage battery pack is 500V-700V.

In one embodiment, the photovoltaic input port includes: a connection interface, a maximum power point tracking controller and a second diode, the connection interface is used for externally connecting the photovoltaic power supply, the connection interface and the maximum power The input terminal of the point tracking controller is connected, the output terminal of the maximum power point tracking controller is connected to the anode of the second diode, and the cathode of the second diode is used as the output terminal of the photovoltaic input port .

In one embodiment, the DC power supply circuit further includes an isolation circuit, the input terminal of the isolation circuit is connected to the output terminal of each of the photovoltaic input ports, and the output terminal of the isolation circuit is connected to the energy storage circuit and each output terminal. The input end of the voltage conversion circuit is connected, and the isolation circuit is used to isolate and output the photovoltaic power supply connected to each of the photovoltaic input ports to the energy storage circuit and each of the voltage conversion circuits.

In one embodiment, the isolation circuit includes a third driver, a second switch, a third switch, a fourth switch, a fifth switch, a third diode, a fourth diode, a fifth diode, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the second inductor, the third inductor and the isolation transformer, the first capacitor of the second capacitor terminal, the input terminal of the second switch tube, the first terminal of the third capacitor, and the cathode of the third diode are connected together as the anode of the input terminal of the isolation circuit, and the first terminal of the second capacitor is connected to the anode of the input terminal of the isolation circuit. The two terminals, the output terminal of the third switch tube, the second terminal of the fourth capacitor and the positive pole of the fourth diode are connected together as the negative pole of the input terminal of the isolation circuit, and the second switch tube The output end of the second inductor is connected to the first end of the second inductor and the input end of the third switch tube, the second end of the second inductor is connected to the first end of the primary winding of the isolation transformer, the The second end of the third capacitor, the anode of the third diode, the first end of the fourth capacitor, the cathode of the fourth diode, and the second end of the primary winding of the isolation transformer share a common connected, the first end of the secondary winding of the isolation transformer is connected to the output end of the fourth switch tube and the input end of the fifth switch tube, the input end of the fourth switch tube, the fifth switch tube The first end of the capacitor, the first end of the seventh capacitor and the first end of the third inductor are connected, the second end of the secondary winding of the isolation transformer and the second end of the fifth capacitor and The first end of the sixth capacitor is connected, the second end of the third inductor and the first end of the eighth capacitor are connected together as the positive electrode of the output end of the isolation circuit, and the output of the fifth switch tube terminal, the second terminal of the sixth capacitor, the second terminal of the seventh capacitor, and the second terminal of the eighth capacitor are connected together as the negative pole of the output terminal of the isolation circuit. The control end, the control end of the third switch tube, the control end of the fourth switch tube, and the control end of the fifth switch tube are commonly connected to the third driver.

In one embodiment, the DC power supply circuit further includes a first switch, a first end of the first switch is connected to the energy storage circuit, and a second end of the first switch is connected to each of the photovoltaic input ports and each of the photovoltaic input ports. The input end of the voltage conversion circuit is connected, and the first switch can close or disconnect the connection between the energy storage circuit and the photovoltaic power source, and can close or disconnect the energy storage circuit and each of the voltage conversions. circuit connection.

A second aspect of the embodiments of the present invention provides a charging pile system, including:

at least two charging stations; and

According to the DC power supply circuit according to the first aspect of the embodiment of the present invention, the DC power supply circuit is used to supply power to each of the charging piles.

The above-mentioned DC power supply circuit, by adding a bidirectional power conversion circuit and at least one photovoltaic input port, can be connected to alternating current and at least one photovoltaic power supply as an input power supply, and an energy storage circuit is added, so as to realize when a certain input power supply is disconnected. The DC power supply circuit can supply power to each load through another input power supply or an energy storage circuit, and by adding at least two voltage conversion circuits, it is possible to supply power to multiple loads with the same or different working voltages, that is, the above-mentioned The DC power supply circuit solves the problems existing in the traditional technical solution that the power input is single, the power supply is easily interrupted, and the power supply requirements of multiple loads with different working voltages cannot be met at the same time.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present utility model. For some novel embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic circuit diagram of a DC power supply circuit according to an embodiment of the present invention;

FIG. 2 is an example circuit schematic diagram of a first voltage conversion circuit in the DC power supply circuit shown in FIG. 1;

FIG. 3 is an example circuit schematic diagram of the first photovoltaic input port in the DC power supply circuit shown in FIG. 1;

FIG. 4 is a schematic circuit diagram when the DC power supply circuit shown in FIG. 1 further includes an isolation circuit;

FIG. 5 is an example circuit schematic diagram of the isolation circuit of the DC power supply circuit shown in FIG. 4;

6 is a schematic circuit diagram when the DC power supply circuit shown in FIG. 1 further includes a first switch;

FIG. 7 is a schematic circuit diagram of a charging pile system according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

Please refer to FIG. 1 , which is a schematic circuit diagram of the DC power supply circuit provided by the first aspect of the embodiment of the present invention. For the convenience of description, only the part related to this embodiment is shown, and the details are as follows:

The DC power supply circuit in this embodiment includes: a bidirectional power conversion circuit 100, at least two voltage conversion circuits, an energy storage circuit 300, and at least one photovoltaic input port. The AC end of the bidirectional power conversion circuit 100 is connected to the AC power, and each voltage is converted The input end of the circuit is connected to the DC end of the bidirectional power conversion circuit 100, the output end of each voltage conversion circuit is connected to each load, the energy storage circuit 300 and the DC end of the bidirectional power conversion circuit 100 are connected to the input end of the voltage conversion circuit, and each photovoltaic circuit is connected to the input end of the voltage conversion circuit. The input ends of the input ports are respectively connected with a photovoltaic power source, and the output ends of the photovoltaic input ports are connected to the energy storage circuit 300 and the input ends of the voltage conversion circuits in common; the bidirectional power conversion circuit 100 can convert alternating current into direct current, and convert direct current Each voltage conversion circuit can convert the direct current into its corresponding target direct current; the energy storage circuit 300 can provide stored direct current, and output the direct current to the voltage conversion circuit and the bidirectional power conversion circuit 100 .

It should be understood that the first voltage conversion circuit 210, the second voltage conversion circuit 220, and the third voltage conversion circuit 230 are illustrated in FIG. 1. In other embodiments, two or more voltage conversion circuits may also be included; FIG. The first photovoltaic input port and the second photovoltaic input port are illustrated in 1. In other embodiments, one or two or more photovoltaic input ports may also be included. The connection relationship of the DC power supply circuit in FIG. 1 is as follows: the AC terminal of the bidirectional power conversion circuit 100 is connected to the AC power, the AC terminal of the bidirectional power conversion circuit 100 is connected to the DC terminal and the input terminal of the first voltage conversion circuit 210 and the second voltage conversion circuit. The input end of 220, the input end of the third voltage conversion circuit 230, the energy storage circuit 300, the output end of the first photovoltaic input port 410 and the output end of the second photovoltaic input port 420 are connected, and the output end of the first voltage conversion circuit 210 It is connected to the first load 11, the output end of the second voltage conversion circuit 220 is connected to the second load 12, the output end of the third voltage conversion circuit 230 is connected to the third load 13, and the input end of the first photovoltaic input port is connected to the first The photovoltaic power source 21 is connected, and the input end of the second photovoltaic input port is connected with the second photovoltaic power source 22 .

It should be understood that the bidirectional power conversion circuit 100 may be composed of bidirectional AC-DC conversion chips; the voltage conversion circuit 300 may be composed of DC-DC conversion chips; the energy storage circuit 300 may be composed of energy storage devices, such as capacitors or batteries.

It should be understood that the connected AC power can be provided by an external AC power supply, or directly connected to the commercial power supply; the voltage of the DC power output by the bidirectional power conversion circuit 100 should not exceed the energy storage voltage of the energy storage circuit 300; the target DC power is required for each normal operation. When the working voltage required by each load is different, the output voltage of each voltage conversion module is also different. For example, the first voltage conversion circuit 210 outputs the first target DC power, and the second voltage conversion circuit 220 outputs the first target DC The second target DC power and the third voltage conversion circuit 230 output the third target DC power, then the first target DC power is the power required by the first load 11 , the second target DC power is the power required by the second load 12 , and the third target DC power is The electrical energy required by the third load 13 , and electrical parameters such as the voltage and current of the first target DC power, the second target DC power, and the third target DC power may or may not be the same.

In the DC power supply circuit in this embodiment, by adding a bidirectional power conversion circuit 100 and at least one photovoltaic input port, AC power and at least one photovoltaic power source can be connected as input power sources, and an energy storage circuit 300 is added, thereby realizing a certain When an input power supply is disconnected, the DC power supply circuit can supply power to each load through another input power supply or an energy storage circuit, and by adding at least two voltage conversion circuits, it is possible to supply multiple loads with the same or different working voltages. Power supply, that is, the above-mentioned DC power supply circuit solves the problems of single power input, easy interruption of power supply and inability to meet the power supply requirements of multiple loads with different working voltages in the traditional technical solution.

In one embodiment, the bidirectional power conversion circuit 100 includes a bidirectional AC-DC conversion chip and a first driver, the AC input and output terminals of the bidirectional AC-DC conversion chip serve as the AC terminals of the bidirectional power conversion circuit 100, and the bidirectional AC-DC conversion chip The DC input and output terminals of the bidirectional power conversion circuit 100 are used as DC terminals, and the control terminal of the bidirectional AC-DC conversion chip is connected to the output terminal of the first driver.

It should be understood that the first driver may be composed of a chip or an integrated circuit capable of outputting PWM (Pulse Width Modulation, pulse width modulation) control, such as a microprocessor such as a single-chip microcomputer; the model of the bidirectional AC-DC conversion chip in this embodiment is DC200DC1KP50K , in other embodiments, other types of bidirectional AC-DC conversion chips may also be used.

Referring to FIG. 2, in one embodiment, the voltage conversion circuit includes a second driver 211, a first switch Q1, a first inductor L1, a first diode D1, and a first capacitor C1. The input of the first switch Q1 The terminal is used as the input terminal of the voltage conversion circuit, the output terminal of the first switch tube Q1 is connected as the first terminal of the first inductor L1 and the cathode of the first diode D1, and the second terminal of the first inductor L1 is connected to the first capacitor C1 The first end of the first capacitor C1 is commonly connected as the output end of the voltage conversion circuit, and the second end of the first capacitor C1 and the positive electrode of the first diode D1 are commonly connected.

It should be understood that the first driver may be composed of a chip or an integrated circuit capable of outputting PWM (Pulse Width Modulation, pulse width modulation) control, such as a microprocessor such as a single-chip microcomputer; the first switch tube Q1 in this embodiment is a PMOS tube, and the The control terminal of a switch Q1 is the gate of the PMOS tube, the input terminal of the first switch Q1 is the drain of the PMOS tube, and the output terminal of the first switch Q1 is the source of the PMOS tube. In other embodiments, The first switch transistor Q1 may also be composed of other types of switch transistors, such as an NMOS transistor, a triode, and the like.

In one embodiment, the energy storage circuit 300 includes an energy storage battery pack. It should be understood that the energy storage battery pack may include at least one energy storage battery, or include two or more energy storage batteries, and each energy storage battery may be connected in series or in parallel to form an energy storage battery pack.

Optionally, the energy storage voltage of the energy storage battery pack is 500V-700V.

Referring to FIG. 3, in one embodiment, taking the first photovoltaic input port 410 as an example, the first photovoltaic input port 410 includes: a connection interface 411, a maximum power point tracking controller 412 and a second diode D2, the connection interface 411 is used for external photovoltaic power supply, the connection interface 411 is connected to the input end of the MPPT controller 412, the output end of the MPPT controller 412 is connected to the anode of the second diode D2, and the second diode D2 The negative pole is used as the output terminal of the photovoltaic input port.

It should be understood that the connection interface 411 may be a power interface, a USB interface, etc.; for the composition of other photovoltaic input ports, reference may be made to the first photovoltaic input port 410 .

Referring to FIG. 4, in one embodiment, the DC power supply circuit further includes an isolation circuit 500. The input end of the isolation circuit 500 is connected to the output end of the first photovoltaic input port 410 and the output ends of the first and second photovoltaic input ports. The isolation circuit The output terminal of 500 is connected to the energy storage circuit 300, the input terminal of the first voltage conversion circuit 210, the input terminal of the second voltage conversion circuit 220, the input terminal of the third voltage conversion circuit 230 and the DC terminal of the bidirectional power conversion circuit 100, That is, the input end of the isolation circuit 500 is connected to the output end of each photovoltaic input port, and the output end of the isolation circuit 500 is connected to the energy storage circuit 300 and the input end of each voltage conversion circuit; the isolation circuit 500 is used to connect each photovoltaic input port The isolated photovoltaic power source is output to the tank circuit 300 and each voltage conversion circuit.

Referring to FIG. 5, in one embodiment, the isolation circuit 500 includes a third driver 510, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, and a third diode D3 , the fourth diode D4, the fifth diode D5, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, The second inductor L2, the third inductor L3, the isolation transformer T1, the first end of the second capacitor C2, the input end of the second switch Q2, the first end of the third capacitor C3, and the negative electrode of the third diode D3 share a common Connected to the positive pole of the input terminal of the isolation circuit 500, the second terminal of the second capacitor C2, the output terminal of the third switch tube Q3, the second terminal of the fourth capacitor C4 and the positive pole of the fourth diode D4 are connected together as the isolation circuit The negative pole of the input end of 500, the output end of the second switch tube Q2 is connected to the first end of the second inductor L2 and the input end of the third switch tube Q3, and the second end of the second inductor L2 is connected to the primary winding of the isolation transformer T1. The first end is connected, the second end of the third capacitor C3, the anode of the third diode D3, the first end of the fourth capacitor C4, the cathode of the fourth diode D4, and the second end of the primary winding of the isolation transformer T1 The terminals are connected in common, the first terminal of the secondary winding of the isolation transformer T1 is connected to the output terminal of the fourth switch tube Q4 and the input terminal of the fifth switch tube Q5, the input terminal of the fourth switch tube Q4 and the first terminal of the fifth capacitor C5 are connected. One end, the first end of the seventh capacitor C7 and the first end of the third inductor L3 are connected, the second end of the secondary winding of the isolation transformer T1 is connected to the second end of the fifth capacitor C5 and the first end of the sixth capacitor C6 The second end of the third inductor L3 and the first end of the eighth capacitor C8 are connected together as the positive electrode of the output end of the isolation circuit 500, the output end of the fifth switch tube Q5, the second end of the sixth capacitor C6, the The second end of the seventh capacitor C7 and the second end of the eighth capacitor C8 are commonly connected to the negative electrode of the output end of the isolation circuit 500, the control end of the second switch tube Q2, the control end of the third switch tube Q3, and the fourth switch tube Q4 The control terminal and the control terminal of the fifth switch transistor Q5 are connected to the third driver 510 in common.

It should be understood that when the ports of each circuit are connected, if each port is divided into a positive electrode and a negative electrode, the positive electrode of each port is connected to the positive electrode, and the negative electrode is connected to the negative electrode. For example, if the input end of the isolation circuit 500 is connected to the energy storage circuit 300, then The positive pole of the input terminal of the isolation circuit 500 is connected to the positive pole of the energy storage circuit 300 , and the negative pole of the DC terminal of the input terminal of the isolation circuit 500 is connected to the negative pole of the energy storage circuit 300 .

It should be understood that the third driver 510 may be composed of a chip or an integrated circuit capable of outputting PWM (Pulse Width Modulation, pulse width modulation) control, such as a microprocessor such as a single-chip microcomputer; the second switch Q2, the third switch Q3, the fourth The switch transistor Q4 and the fifth switch transistor Q5 are PMOS transistors. In other embodiments, the second switch transistor Q2, the third switch transistor Q3, the fourth switch transistor Q4 and the fifth switch transistor Q5 can also be made of other types of switch transistors. Components, such as NMOS transistors, triodes, etc.

Referring to FIG. 6, in one embodiment, it further includes a first switch K1, the first end of the first switch K1 is connected to the energy storage circuit 300, the second end of the first switch K1 and each photovoltaic input port and each voltage conversion The input end of the circuit is connected, and the first switch K1 can close or disconnect the connection between the energy storage circuit 300 and the photovoltaic power source, and can close or disconnect the connection between the energy storage circuit 300 and each voltage conversion circuit. It should be understood that the first switch K1 may be a mechanical switch or an electronic switch.

It should be understood that the first driver, the second driver 211 and the third driver 510 in the embodiment of the present invention may be the same driver, or may be different drivers.

Referring to FIG. 7 , a second aspect of the embodiment of the present invention provides a charging pile system, including: at least two charging piles; and a DC power supply circuit as described in the first aspect of the embodiment of the present invention; To supply power to each charging pile.

FIG. 7 illustrates the first charging pile 31 , the second charging pile 32 and the third charging pile 33 . In other embodiments, two or more charging piles may also be included. It should be understood that for the connection between each charging pile and the DC power supply circuit in this embodiment, reference may be made to the connection between each load and the DC power supply circuit in the first aspect of the embodiment of the present invention, and the voltage of each charging pile in this embodiment can be Consistent or inconsistent.

In the charging pile system in this embodiment, by adding a DC power supply circuit, it is possible to use one DC power supply circuit to supply power to multiple charging piles at the same time, and when one of the input power sources in the DC power supply circuit is damaged or disconnected, the It will affect the continuous power supply of the DC power supply circuit to each charging pile, so that the circuit of the charging pile system is simple and the work will not be interrupted due to the power failure of a certain input power supply.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (10)

1. A dc power supply circuit, comprising:

a bidirectional electric energy conversion circuit, an alternating current end of which is connected with an alternating current, the bidirectional electric energy conversion circuit being capable of converting the alternating current into a direct current and converting the direct current into the alternating current;

the input end of each voltage conversion circuit is connected with the direct current end of the bidirectional electric energy conversion circuit, the output end of each voltage conversion circuit is externally connected with each load, and each voltage conversion circuit can convert the direct current into a corresponding target direct current;

the energy storage circuit is connected with the direct current end of the bidirectional electric energy conversion circuit and the input end of the voltage conversion circuit, and can provide and store the direct current and output the direct current to the voltage conversion circuit and the bidirectional electric energy conversion circuit; and

the input end of each photovoltaic input port is externally connected with a photovoltaic power supply, and the output end of each photovoltaic input port is commonly connected with the input ends of the energy storage circuit and the voltage conversion circuit.

2. The DC power supply circuit of claim 1, wherein the bidirectional power conversion circuit comprises a bidirectional AC-DC conversion chip and a first driver, the AC input/output terminal of the bidirectional AC-DC conversion chip is used as the AC terminal of the bidirectional power conversion circuit, the DC input/output terminal of the bidirectional AC-DC conversion chip is used as the DC terminal of the bidirectional power conversion circuit, and the control terminal of the bidirectional AC-DC conversion chip is connected to the output terminal of the first driver.

3. The dc power supply circuit of claim 1, wherein the voltage converting circuit comprises a second driver, a first switch tube, a first inductor, a first diode, and a first capacitor, an input terminal of the first switch tube is used as an input terminal of the voltage converting circuit, an output terminal of the first switch tube is connected to a negative terminal of the first diode as a first terminal of the first inductor, a second terminal of the first inductor and a first terminal of the first capacitor are connected in common to serve as an output terminal of the voltage converting circuit, and a second terminal of the first capacitor is connected in common to a positive terminal of the first diode.

4. The dc power supply circuit of claim 1, wherein the energy storage circuit comprises an energy storage battery pack.

5. The DC power supply circuit of claim 4, wherein the energy storage voltage of the energy storage battery pack is 500V-700V.

6. The dc power supply circuit of claim 1, wherein the photovoltaic input port comprises: the photovoltaic power supply comprises a connecting interface, a maximum power point tracking controller and a second diode, wherein the connecting interface is used for being externally connected with the photovoltaic power supply, the connecting interface is connected with the input end of the maximum power point tracking controller, the output end of the maximum power point tracking controller is connected with the anode of the second diode, and the cathode of the second diode is used as the output end of the photovoltaic input port.

7. The direct-current power supply circuit as claimed in any one of claims 1 to 6, further comprising an isolation circuit, wherein an input end of the isolation circuit is connected to an output end of each of the photovoltaic input ports, an output end of the isolation circuit is connected to the energy storage circuit and an input end of each of the voltage conversion circuits, and the isolation circuit is configured to isolate the photovoltaic power supply accessed by each of the photovoltaic input ports and output the isolated photovoltaic power supply to the energy storage circuit and each of the voltage conversion circuits.

8. The DC power supply circuit of claim 7, wherein the isolation circuit comprises a third driver, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a third diode, a fourth diode, a fifth diode, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a second inductor, a third inductor, and an isolation transformer, wherein a first terminal of the second capacitor, an input terminal of the second switch tube, a first terminal of the third capacitor, and a negative terminal of the third diode are connected in common to serve as a positive terminal of the input terminal of the isolation circuit, a second terminal of the second capacitor, an output terminal of the third switch tube, a second terminal of the fourth capacitor, and a positive terminal of the fourth diode are connected in common to serve as a negative terminal of the input terminal of the isolation circuit, the output end of the second switch tube is connected with the first end of the second inductor and the input end of the third switch tube, the second end of the second inductor is connected with the first end of the primary winding of the isolation transformer, the second end of the third capacitor, the anode of the third diode, the first end of the fourth capacitor, the cathode of the fourth diode and the second end of the primary winding of the isolation transformer are connected in common, the first end of the secondary winding of the isolation transformer and the output end of the fourth switch tube are connected with the input end of the fifth switch tube, the input end of the fourth switch tube, the first end of the fifth capacitor, the first end of the seventh capacitor and the first end of the third inductor are connected, the second end of the secondary winding of the isolation transformer and the second end of the fifth capacitor are connected with the first end of the sixth capacitor, the second end of the third inductor and the first end of the eighth capacitor are connected in common to serve as the anode of the output end of the isolation circuit, the output end of the fifth switch tube, the second end of the sixth capacitor, the second end of the seventh capacitor and the second end of the eighth capacitor are connected in common to serve as the cathode of the output end of the isolation circuit, and the control end of the second switch tube, the control end of the third switch tube, the control end of the fourth switch tube and the control end of the fifth switch tube are connected in common to the third driver.

9. The dc power supply circuit of claim 1, further comprising a first switch, a first terminal of the first switch being connected to the tank circuit, a second terminal of the first switch being connected to each of the photovoltaic input ports and to an input terminal of each of the voltage conversion circuits, the first switch being capable of closing or opening the tank circuit to the photovoltaic power source and the tank circuit to each of the voltage conversion circuits.

10. A charging pile system, comprising:

at least two charging piles; and

the dc supply circuit of any one of claims 1 to 9, configured to supply power to each charging post.

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