Charging pile parallel operation charging system

Abstract

The utility model provides a charging pile parallel operation charging system. The charging pile parallel operation charging system comprises a photovoltaic module, an energy storage battery, a power conversion device and at least two charging piles. A photovoltaic module is connected to a photovoltaic connecting port of a power conversion device, an energy storage battery is connected to a battery connecting port of the power conversion device, an output port of the power conversion device is connected with input ports of at least two charging piles, and the input ports of the at least two charging piles can be further used for being connected with a power grid. The photovoltaic module and the energy storage battery can supply power to the charging pile through the power conversion device, energy generated by the photovoltaic module can be effectively utilized, power grid energy consumed by the charging pile is reduced, the problem that the load of a power grid is too large is solved, and energy saving can be achieved. When the electric energy of the photovoltaic module and the energy storage battery is insufficient, the charging pile can still be powered by the power grid, and normal operation of the charging pile is guaranteed.

Description

Technical Field

[0001] The present application belongs to the technical field of charging piles, and in particular to a charging pile parallel charging system. Background Art

[0002] With the popularization of new energy vehicles, the number of new energy vehicles has increased dramatically. New energy vehicles face many problems such as long charging time and low charging efficiency. If there are multiple new energy vehicles charging at the same time in a charging station or a community, it will cause the problem of excessive load on the city electricity. Utility Model Content

[0003] The embodiment of the present application provides a charging pile parallel charging system, which can power the charging pile through photovoltaic modules and energy storage batteries, thereby preventing the problem of excessive load on the power grid.

[0004] The present application provides a charging pile parallel charging system, comprising an energy storage battery, a power conversion device and a charging pile with at least two output ports connected in parallel; the energy storage battery is connected to the battery connection port of the power conversion device, and the photovoltaic connection port of the power conversion device is used to connect the photovoltaic module; the output ports of the power conversion device are respectively connected to the input ports of at least two charging piles; the power conversion device is used to convert the electric energy of the photovoltaic module and / or the energy storage battery into power and provide it to the charging pile, so that the charging pile can charge the connected equipment to be charged; the input ports of at least two charging piles are also used to connect to the power grid, and the charging piles are also used to obtain electric energy from the power grid.

[0005] In the embodiment of the present application, by connecting the photovoltaic module to the photovoltaic connection port of the power conversion device, connecting the energy storage battery to the battery connection port of the power conversion device, and connecting the output port of the power conversion device to the input ports of at least two charging piles respectively, and the input ports of at least two charging piles can also be used to connect to the power grid, the photovoltaic module and the energy storage battery can supply power to the charging pile through the power conversion device, and the energy generated by the photovoltaic module can be effectively utilized, the power grid energy consumed by the charging pile can be reduced, the problem of excessive power grid load can be prevented, and energy saving can be achieved. When the power of the photovoltaic module and the energy storage battery is insufficient, the charging pile can still be powered by the power grid to ensure the normal operation of the charging pile.

[0006] In one possible implementation, the power conversion device includes an inverter circuit, a first end of the inverter circuit is connected to a battery connection port and a photovoltaic connection port, and a second end of the inverter circuit is connected to an output port; the inverter circuit is used to convert the electrical energy of the photovoltaic component and / or the energy storage battery into alternating current and then provide it to the charging pile.

[0007] In one possible implementation, the power conversion device also includes a first DC conversion circuit, and the first end of the inverter circuit is connected to the photovoltaic connection port through the first DC conversion circuit. The first DC conversion circuit is used to convert the electric energy of the photovoltaic component into voltage and provide it to the inverter circuit.

[0008] In one possible implementation, the power conversion device also includes a second DC conversion circuit, and the first end of the inverter circuit is connected to the battery connection port through the second DC conversion circuit, and the second DC conversion circuit is used to convert the electric energy of the energy storage battery into voltage and provide it to the inverter circuit.

[0009] In a possible implementation, the second DC conversion circuit is further used to convert the electric energy at the first end of the inverter circuit into a voltage and provide the converted electric energy to the energy storage battery to charge the energy storage battery.

[0010] In one possible implementation, the inverter circuit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor and a second inductor; the first ends of the first switch tube and the second switch tube are both connected to the positive poles of the battery connection port and the photovoltaic connection port, the second end of the first switch tube is connected to the first end of the third switch tube, the second end of the second switch tube is connected to the first end of the fourth switch tube, and the second ends of the third switch tube and the fourth switch tube are both connected to the negative poles of the battery connection port and the photovoltaic connection port; the first end of the first inductor is connected to the connection node of the first switch tube and the third switch tube, and the second end of the first inductor is connected to the first terminal of the output port; the first end of the second inductor is connected to the connection node of the second switch tube and the fourth switch tube, and the second end of the second inductor is connected to the second terminal of the output port.

[0011] In one possible implementation, the charging pile parallel charging system also includes a power detection device, which is connected between the power grid and the input port of the charging pile. The power detection device is communicatively connected to the power conversion device. The power detection device is used to detect the power grid of the power grid and send the power grid power to the power conversion device.

[0012] In a possible implementation, the charging pile parallel charging system further includes a management device, which is used to detect the working status and fault information of the charging piles and communicate with the user terminal.

[0013] In a possible implementation, when all charging piles are in standby mode, the power conversion device is also used to convert the electric energy of the photovoltaic components and / or the power grid and provide it to the energy storage battery to charge the energy storage battery.

[0014] In one possible implementation, the output port of the power conversion device is also connected to the power grid. When all charging piles are in standby mode and the energy storage battery is fully charged, the power conversion device is also used to convert the electrical energy of the photovoltaic module into power and provide it to the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a module schematic diagram of the charging pile parallel charging system provided in an embodiment of the present application.

[0016] Figure 2 It is a module schematic diagram of a charging pile parallel charging system provided in another embodiment of the present application.

[0017] Figure 3 It is a module schematic diagram of a charging pile parallel charging system provided in another embodiment of the present application.

[0018] Figure 4 It is a module schematic diagram of a charging pile parallel charging system provided in yet another embodiment of the present application.

[0019] Figure 5 It is a module diagram of a charging pile parallel charging system of a specific example of the present application. DETAILED DESCRIPTION

[0020] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In the specification, claims and drawings of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "multiple" in the specification, claims and drawings of the present application refers to two or more than two.

[0021] It is understandable that the connection relationship described in the present application refers to direct or indirect connection. For example, A is connected to B or A is electrically connected to B, which can be either A and B are directly connected or A and B are indirectly connected through one or more other electrical components, for example, A and C are directly connected, and C and B are directly connected, so that A and B are connected through C.

[0022] It should also be noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart includes one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchangeable with each other, and some of the steps can also be deleted.

[0023] Some embodiments will be described below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0024] The embodiment of the present application provides a charging pile parallel charging system, which can power the charging pile through photovoltaic modules and energy storage batteries, thereby preventing the problem of excessive load on the power grid.

[0025] Please refer to Figure 1 , Figure 1 A schematic diagram of a module of a charging pile parallel charging system 10 provided in an embodiment of the present application.

[0026] The charging pile parallel charging system 10 comprises an energy storage battery 100 , a power conversion device 200 and at least two charging piles 300 .

[0027] The energy storage battery 100 is connected to the battery connection port of the power conversion device 200, and the photovoltaic connection port of the power conversion device 200 is used to connect the photovoltaic module 20. The output port of the power conversion device 200 is respectively connected to the input ports of at least two charging piles 300. Among them, the input ports of at least two charging piles 300 are connected in parallel.

[0028] The power conversion device 200 can be used to convert the electric energy of the photovoltaic module 20 and / or the energy storage battery 100 and provide it to the charging pile 300, so that the charging pile 300 can charge the connected device to be charged (not shown).

[0029] It can be understood that the power conversion device 200 can provide the power of the photovoltaic module 20 to the charging pile 300 after power conversion when the power of the photovoltaic module 20 is sufficient. The power conversion device 200 can also provide the power of the energy storage battery 100 to the charging pile 300 after power conversion when the power of the photovoltaic module 20 is insufficient but the power of the energy storage battery 100 is sufficient. Alternatively, when the total power of the photovoltaic module 20 and the energy storage battery 100 is sufficient, the power conversion device 200 can provide the power of the photovoltaic module 20 and the energy storage battery 100 to the charging pile 300 after power conversion. If there is still surplus power after the photovoltaic module 20 is provided to the charging pile 300, the power conversion device 200 can charge the energy storage battery 100 after power conversion of the surplus power.

[0030] The power conversion device 200 can determine whether the power of the photovoltaic module 20 is sufficient by detecting the voltage and current of its photovoltaic connection port, and determine whether the power of the energy storage battery 100 is sufficient by detecting the voltage and current of its battery connection port. Alternatively, the power conversion device 200 can obtain the power information of the energy storage battery 100 by communicating with the energy storage battery 100, and then determine whether the power of the energy storage battery 100 is sufficient. In this case, the power conversion device 200 can obtain the power information by communicating with the battery management system in the energy storage battery 100.

[0031] The input ports of at least two charging posts 300 are also used to connect to the power grid 30 , and the charging posts 300 are also used to obtain electrical energy from the power grid 30 .

[0032] The input port of the charging pile 300 is also connected to the power grid 30. In this way, when the power of the photovoltaic module 20 and the energy storage battery 100 is insufficient, the charging pile 300 can also be powered by the power grid 30 to ensure that the charging pile 300 can work normally. It can be understood that when the power grid 30 is not connected to the charging pile parallel charging system 10 and the photovoltaic module 20 is insufficient, the energy storage battery 100 can be used to power the charging pile 300 through the power conversion device 200.

[0033] It can be understood that since the input ports of the charging piles 300 are connected in parallel, the power conversion device 200 and the power grid 30 can supply power to the charging piles 300 respectively.

[0034] In the embodiment of the present application, by connecting the photovoltaic assembly 20 to the photovoltaic connection port of the power conversion device 200, connecting the energy storage battery 100 to the battery connection port of the power conversion device 200, and the output port of the power conversion device 200 is respectively connected to the input ports of at least two charging piles 300, and the input ports of at least two charging piles 300 can also be used to connect to the power grid 30, so that the photovoltaic assembly 20 and the energy storage battery 100 can supply power to the charging pile 300 through the power conversion device 200, and can effectively utilize the energy generated by the photovoltaic assembly 20, reduce the energy of the power grid 30 consumed by the charging pile 300, prevent the problem of excessive load of the power grid 30, and achieve energy saving. When the power of the photovoltaic assembly 20 and the energy storage battery 100 is insufficient, the charging pile 300 can still be powered by the power grid 30 to ensure that the charging pile 300 can operate normally.

[0035] In the embodiment of the present application, the device to be charged can be a new energy vehicle. Therefore, when multiple new energy vehicles are charged simultaneously through multiple charging piles 300 in the charging pile parallel charging system 10 of the embodiment of the present application, they can be powered by the photovoltaic components 20 and the energy storage battery 100, thereby preventing the problem of overload of the power grid 30.

[0036] In some embodiments, when all charging piles 300 in the charging pile parallel charging system 10 are in standby state, the power conversion device 200 can also be used to convert the power of the photovoltaic module 20 and / or the power grid 30 and provide it to the energy storage battery 100 to charge the energy storage battery 100. The charging pile 300 being in standby state means that the charging pile 300 is not connected to the device to be charged.

[0037] The output port of the power conversion device 200 can also be connected to the power grid 30. In this way, when the energy storage battery 100 is charged to a fully charged state and all charging piles 300 are in a standby state, the power conversion device 200 can be used to convert the electric energy of the photovoltaic module 20 and provide it to the power grid 30, so as to sell electricity to the power grid 30 and thereby achieve profit.

[0038] It can be understood that since at least two charging piles 300 are provided in the charging pile parallel charging system 10, in order to make each charging pile 300 operate better, a host can be provided in each charging pile 300, and the other charging piles 300 are slaves. The host communicates with the power conversion device 200, and the host communicates with each slave. The host can obtain the photovoltaic power of the photovoltaic module 20, the battery power of the energy storage battery 100, and the grid 30 power of the grid 30 by communicating with the power conversion device 200, and control the operation of the host 4 and the slave according to the photovoltaic power, the battery power, and the grid 30 power.

[0039] The host in the charging pile parallel charging system 10 may be preset, or may be determined by host competition when each charging pile 300 is turned on and running.

[0040] In the embodiment of the present application, the power conversion device 200 and the host can be connected by wired communication, for example, by communication buses such as RS485 bus, CAN bus, etc. Of course, the power conversion device 200 and the host can also be connected by wireless communication, for example, by Bluetooth communication, Zigbee communication, UWB communication, etc. to achieve wireless communication connection, and the present application does not limit this.

[0041] like Figure 2 As shown, in some embodiments, the charging pile parallel charging system 10 may further include a power detection device 400, which is connected between the power grid 30 and the input port of the charging pile 300, and the power detection device 400 is communicatively connected with the power conversion device 200. The power detection device 400 is used to detect the power grid of the power grid 30 and send the power grid to the power conversion device 200.

[0042] Specifically, the power detection device 400 may include an electric meter, through which the output power of the power grid 30 , that is, the power of the power grid, is collected.

[0043] In some embodiments, when the detected grid power is a positive value, it indicates that the grid 30 outputs electric energy to the charging pile 300 or the power conversion device 200. When the detected grid power is a negative value, it indicates that the photovoltaic module 20 and / or the energy storage battery 100 is selling electricity to the grid 30 through the power conversion device 200.

[0044] Please refer to Figure 2In some embodiments, the charging pile parallel charging system 10 may further include a management device 500 , which is used to detect the working status and fault information of the charging pile 300 and communicate with the user terminal 40 .

[0045] The management device 500 and the user terminal 40 may be connected via wireless communication, such as Bluetooth communication, Zigbee communication, UWB communication, etc., which is not limited in this application. The user terminal 40 may be a mobile phone, a computer, or other device.

[0046] The management device 500 can communicate with the user terminal 40 to send the working status and fault information to the user terminal 40, so that relevant personnel can obtain the working status and fault information of the charging pile 300 in the charging pile parallel charging system 10 in real time through the user terminal 40, thereby monitoring the charging pile 300.

[0047] The management device 500 can also be used to receive control instructions sent by the user terminal 40, and send the control instructions to the charging pile 300, so that the charging pile 300 performs corresponding operations according to the control instructions, thereby controlling the operation of the charging pile 300, so as to achieve remote control of the charging pile 300. The control instructions can be used to control the charging pile 300 to start, stop charging, shut down, switch charging gears, and other operations.

[0048] The control instruction may be generated by relevant personnel performing relevant operations on the user terminal 40 according to the working status and fault information of the charging pile 300. It can be understood that the control instruction may include the identification information of the charging pile 300 to be controlled, so that the management device 500 sends the control instruction to the corresponding charging pile 300 according to the identification information.

[0049] like Figure 3 As shown, in some embodiments, the charging pile 300 may be a single-phase AC charging pile, in which case the live wire of the charging pile 300 is connected to one of the live wires (any one of L1, L2, and L3) of the power grid 30, the neutral wire of the charging pile 300 is connected to the neutral wire N of the power grid 30, and the ground wire of the charging pile 300 is connected to the ground wire PE of the power grid 30. The power conversion device 200 may include a single-phase inverter circuit (not shown), the live wire of the single-phase inverter circuit is connected to the live wire of the charging pile 300 and one of the live wires (any one of L1, L2, and L3) of the power grid 30, the neutral wire of the single-phase inverter circuit is connected to the neutral wire N of the charging pile 300 and the power grid 30, and the ground wire of the single-phase inverter circuit is connected to the ground wire PE of the charging pile 300 and the power grid 30.

[0050] Of course, the charging pile 300 can also be a three-phase AC charging pile, and correspondingly, the power conversion device 200 may include a three-phase inverter circuit (not shown). At this time, the three live wires of the charging pile 300 are respectively connected to the three live wires of the power grid 30 and the three-phase inverter circuit, the neutral wire of the charging pile 300 is connected to the power grid 30 and the neutral wire of the three-phase inverter circuit, and the ground wire of the charging pile 300 is connected to the power grid 30 and the ground wire of the three-phase inverter circuit.

[0051] Correspondingly, the power detection device 400 may include a three-phase direct-connected meter, and the neutral line, ground line and three live lines of the power grid 30 are respectively connected to the three-phase AC charging pile and the three-phase inverter circuit through the three-phase direct-connected meter. The three-phase direct-connected meter can detect the voltage, current and power of the neutral line, ground line and three live lines of the power grid 30 respectively.

[0052] When the charging pile 300 is an AC charging pile, the power conversion device 200 needs to be able to convert the DC power provided by the photovoltaic module 20 and the energy storage battery 100 into AC power. Figure 4 As shown, the power conversion device 200 includes an inverter circuit 210, a first end of the inverter circuit 210 is connected to the battery connection port and the photovoltaic connection port, and a second end of the inverter circuit 210 is connected to the output port. The inverter circuit 210 is used to convert the electrical energy of the photovoltaic module 20 and / or the energy storage battery 100 into AC power and then provide it to the charging pile 300.

[0053] Furthermore, the power conversion device 200 may also include a first DC conversion circuit 220, and the first end of the inverter circuit 210 is connected to the photovoltaic connection port through the first DC conversion circuit 220, and the first DC conversion circuit 220 is used to convert the electric energy of the photovoltaic component 20 into voltage and provide it to the inverter circuit 210.

[0054] Thus, the electric energy of the photovoltaic module 20 is converted into voltage by the first DC conversion circuit 220 and then provided to the inverter circuit 210, which can provide a more stable voltage to the inverter circuit 210, thereby improving the voltage stability provided by the power conversion device 200 to the charging pile 300. The first DC conversion circuit 220 can be set as a Boost circuit, a Buck-Boost circuit, etc.

[0055] Furthermore, the power conversion device 200 may also include a second DC conversion circuit 230, and the first end of the inverter circuit 210 is connected to the battery connection port through the second DC conversion circuit 230, and the second DC conversion circuit 230 is used to convert the electric energy of the energy storage battery 100 into voltage and provide it to the inverter circuit 210.

[0056] In this way, the energy storage battery 100 performs voltage conversion through the second DC conversion circuit 230 and then provides it to the inverter circuit 210 , so that the second DC conversion circuit 230 can provide a voltage that meets the requirements of the inverter circuit 210 .

[0057] In order to satisfy that the power conversion device 200 can also realize power conversion of the electric energy of the photovoltaic module 20 and / or the power grid 30 and provide it to the energy storage battery 100 to charge the energy storage battery 100, the second DC conversion circuit 230 can also be used to convert the electric energy of the first end of the inverter circuit 210 into voltage and provide it to the energy storage battery 100. The electric energy of the first end of the inverter circuit 210 can be the electric energy provided by the photovoltaic module 20 through the first DC conversion circuit 220, or the electric energy provided by the power grid 30. The second DC conversion circuit 230 can be set as a DC-DC bidirectional circuit.

[0058] It can be understood that the inverter circuit 210 can also be used to convert the alternating current provided by the power grid 30 into direct current.

[0059] Specifically, if Figure 5 As shown, the inverter circuit 210 may include a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a first inductor L1 and a second inductor L2.

[0060] The first ends of the first switch tube S1 and the second switch tube S2 are both connected to the positive poles of the battery connection port and the photovoltaic connection port, the second end of the first switch tube S1 is connected to the first end of the third switch tube S3, the second end of the second switch tube S2 is connected to the first end of the fourth switch tube S4, and the second ends of the third switch tube S3 and the fourth switch tube S4 are both connected to the negative poles of the battery connection port and the photovoltaic connection port.

[0061] The first ends of the first switch tube S1 and the second switch tube S2 can be connected to the positive electrode of the photovoltaic connection port through the positive output electrode of the first DC conversion circuit 220, and connected to the positive electrode of the battery connection port through the positive output electrode of the second DC conversion circuit 230. The second ends of the third switch tube S3 and the fourth switch tube S4 can be connected to the negative electrode of the photovoltaic connection port through the negative output electrode of the first DC conversion circuit 220, and connected to the negative electrode of the battery connection port through the negative output electrode of the second DC conversion circuit 230.

[0062] The first end of the first inductor L1 is connected to the connection node of the first switch tube S1 and the third switch tube S3, and the second end of the first inductor L1 is connected to the first terminal of the output port. The first end of the second inductor L2 is connected to the connection node of the second switch tube S2 and the fourth switch tube S4, and the second end of the second inductor L2 is connected to the second terminal of the output port.

[0063] Among them, the first terminal can be used to connect the live wire L of the charging pile 300 and the power grid 30, and the second terminal can be used to connect the neutral wire N of the charging pile 300 and the power grid 30.

[0064] Of course, in the embodiments of the present application, the specific circuit structure of the inverter circuit 210 is not limited and can be set according to actual application requirements.

[0065] In some other embodiments, the charging pile 300 can also be a DC charging pile. At this time, the power conversion device 200 is used to convert the direct current provided by the photovoltaic module 20 and / or the energy storage battery 100 and then provide it to the charging pile 300. A rectification circuit is also provided between the input port of the power grid 30 and the charging pile 300 to convert the alternating current provided by the power grid 30 into direct current and then provide it to the charging pile 300.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not restrictive. In the actual application process, all the content of the technical solutions described in any embodiment of the present application can be implemented, or some content can be added, or some content can be deleted, or some content can be changed / replaced. Although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A charging pile parallel charging system, characterized in that: A charging pile including an energy storage battery, a power conversion device and at least two output ports connected in parallel; The energy storage battery is connected to the battery connection port of the power conversion device, and the photovoltaic connection port of the power conversion device is used to connect the photovoltaic module; the output port of the power conversion device is respectively connected to the input ports of at least two charging piles; The power conversion device is used to convert the electric energy of the photovoltaic module and / or the energy storage battery into power and then provide it to the charging pile, so that the charging pile can charge the device to be charged connected to it; The input ports of at least two of the charging piles are also used to connect to a power grid, and the charging piles are also used to obtain electrical energy from the power grid.

2. The charging pile parallel charging system according to claim 1, characterized in that: The power conversion device includes an inverter circuit, a first end of the inverter circuit is connected to the battery connection port and the photovoltaic connection port, and a second end of the inverter circuit is connected to the output port; the inverter circuit is used to convert the electric energy of the photovoltaic component and / or the energy storage battery into alternating current and then provide it to the charging pile.

3. The charging pile parallel charging system according to claim 2, characterized in that: The power conversion device also includes a first DC conversion circuit, and the first end of the inverter circuit is connected to the photovoltaic connection port through the first DC conversion circuit. The first DC conversion circuit is used to convert the electric energy of the photovoltaic component into voltage and provide it to the inverter circuit.

4. The charging pile parallel charging system according to claim 2 or 3, characterized in that: The power conversion device also includes a second DC conversion circuit, and the first end of the inverter circuit is connected to the battery connection port through the second DC conversion circuit. The second DC conversion circuit is used to convert the electric energy of the energy storage battery into voltage and provide it to the inverter circuit.

5. The charging pile parallel charging system according to claim 4, characterized in that: The second DC conversion circuit is further used for converting the electric energy at the first end of the inverter circuit into a voltage and providing the converted electric energy to the energy storage battery to charge the energy storage battery.

6. The charging pile parallel charging system according to claim 2, characterized in that: The inverter circuit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor and a second inductor; the first ends of the first switch tube and the second switch tube are both connected to the positive poles of the battery connection port and the photovoltaic connection port, the second end of the first switch tube is connected to the first end of the third switch tube, the second end of the second switch tube is connected to the first end of the fourth switch tube, and the second ends of the third switch tube and the fourth switch tube are both connected to the negative poles of the battery connection port and the photovoltaic connection port; the first end of the first inductor is connected to the connection node of the first switch tube and the third switch tube, and the second end of the first inductor is connected to the first terminal of the output port; the first end of the second inductor is connected to the connection node of the second switch tube and the fourth switch tube, and the second end of the second inductor is connected to the second terminal of the output port.

7. The charging pile parallel charging system according to claim 1, characterized in that: The charging pile parallel charging system also includes a power detection device, which is connected between the power grid and the input port of the charging pile. The power detection device is communicatively connected to the power conversion device. The power detection device is used to detect the power grid power of the power grid and send the power grid power to the power conversion device.

8. The charging pile parallel charging system according to claim 1, characterized in that: The charging pile parallel charging system also includes a management device, which is used to detect the working status and fault information of the charging pile and communicate with the user terminal.

9. The charging pile parallel charging system according to claim 1, characterized in that: When all the charging piles are in standby mode, the power conversion device is further used to convert the electric energy of the photovoltaic components and / or the power grid and provide it to the energy storage battery to charge the energy storage battery.

10. The charging pile parallel charging system according to claim 9, characterized in that: The output port of the power conversion device is also connected to the power grid. When all the charging piles are in standby mode and the energy storage battery is fully charged, the power conversion device is also used to convert the electric energy of the photovoltaic module into power and provide it to the power grid.

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