Charging and discharging control system and charging pile

Abstract

The present invention discloses a charge and discharge control system and a charging pile. The charge and discharge control system includes a first input end of a power supply module connected to a first charge and discharge port, a second input end of the power supply module connected to a second charge and discharge port, an output end of the power supply module connected to a switching power supply, which obtains an electrical signal output by the first charge and discharge port or an electrical signal output by the second charge and discharge port and outputs a first power supply signal to the switching power supply module; the switching power supply module is connected to a charge and discharge control module and is configured to output a second power supply signal to the charge and discharge control module based on the first power supply signal; the charge and discharge control module is arranged between the first charge and discharge port and the second charge and discharge port and is configured to start and enter an operating mode based on the second power supply signal and perform charge and discharge control on the first charge and discharge port and the second charge and discharge port. This technical solution can start the charge and discharge control module using only a switching power supply module, reducing the cost and volume of the charge and discharge control system.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a charge and discharge control system and a charging pile. Background Art

[0002] Electric vehicles are increasingly gaining popularity and popularity. With the widespread adoption of bidirectional onboard chargers, electric vehicles now boast a 3.5kW discharge capacity, making them convenient for outdoor travel and household emergency power needs. Currently, a variety of portable charging and discharge guns are available on the market. However, these products rely on two independent switching power supplies, resulting in bulky, costly, and difficult EMC compliance. Summary of the Invention

[0003] The embodiments of the present invention provide a charge and discharge control system and a charging pile to solve the problems of large size and high cost of existing bidirectional vehicle-mounted charging equipment.

[0004] A charge and discharge control system, comprising a power supply module, a switching power supply module and a charge and discharge control module;

[0005] The first input end of the power supply module is connected to the first charge and discharge port, the second input end of the power supply module is connected to the second charge and discharge port, and the output end of the power supply module is connected to the switching power supply, and is used to obtain the electrical signal output by the first charge and discharge port, or the electrical signal output by the second charge and discharge port, and output a first power supply signal to the switching power supply module;

[0006] The switching power supply module is connected to the charge and discharge control module and is used to output a second power supply signal to the charge and discharge control module according to the first power supply signal;

[0007] The charge and discharge control module is arranged between the first charge and discharge port and the second charge and discharge port, and is used to start entering the working mode according to the second power supply signal and perform charge and discharge control on the first charge and discharge port and the second charge and discharge port.

[0008] Furthermore, the power supply module includes two power supply circuits;

[0009] One of the power supply circuits is provided between the first charge and discharge port and the switching power supply module, and the other power supply circuit is provided between the second charge and discharge port and the switching power supply module.

[0010] Furthermore, the power supply circuit includes an overcurrent protection circuit, a common mode suppression circuit and a rectification circuit;

[0011] The input end of the overcurrent protection circuit is used to connect to the first charge and discharge port or the second charge and discharge port, and the output end of the overcurrent protection circuit is connected to the common mode suppression circuit, and is used to suppress overcurrent of the electrical signal output by the first charge and discharge port or the second charge and discharge port;

[0012] The common-mode suppression circuit is connected to the rectifier circuit and is used to perform common-mode suppression on the electrical signal output by the first charge-discharge port or the second charge-discharge port;

[0013] The rectifier circuit is connected to the switching power supply module, and is used to convert the electrical signal output from the first charging and discharging port or the second charging and discharging port into a DC signal, and output a first power supply signal to the switching power supply module.

[0014] Furthermore, the overcurrent protection circuit includes a resettable fuse.

[0015] Furthermore, the common-mode suppression circuit includes a common-mode inductor;

[0016] A first end of the common-mode inductor is connected to the overcurrent protection circuit, and a second end of the common-mode inductor is connected to the rectifier circuit.

[0017] Furthermore, the rectifier circuit includes a first diode, a second diode, a third diode and a fourth diode;

[0018] The anode of the first diode and the cathode of the second diode are connected in common and are connected to the common-mode suppression circuit; the anode of the third diode and the cathode of the fourth diode are connected in common and are connected to the common-mode suppression circuit;

[0019] The cathode of the first diode and the anode of the third diode are commonly connected to the switching power supply module, and the cathode of the third diode and the anode of the fourth diode are commonly connected to the ground.

[0020] Furthermore, the withstand voltage values ​​of the first diode, the second diode, the third diode and the fourth diode are all not less than 4000 volts.

[0021] Furthermore, the switching power supply module includes a switching power supply chip, a high-voltage capacitor, a low-voltage capacitor and a filter capacitor;

[0022] The positive input electrode of the switching power supply chip is connected to the power supply module, and the negative input electrode of the switching power supply chip is grounded; the positive output electrode of the switching power supply chip is connected to the charge and discharge control module, and the negative output electrode of the switching power supply chip is grounded;

[0023] The high-voltage capacitor is arranged between the input positive electrode and the input negative electrode of the switching power supply chip;

[0024] The low-voltage capacitor and the filter capacitor are arranged in parallel between the output positive electrode and the output negative electrode of the switching power supply chip.

[0025] Furthermore, the switching power supply chip is a flyback switching power supply chip.

[0026] A charging pile includes the above-mentioned charging and discharging control system.

[0027] An embodiment of the present invention provides a charge and discharge control system and a charging pile, wherein the charge and discharge control system includes a power supply module, a switching power supply module and a charge and discharge control module; the first input end of the power supply module is connected to the first charge and discharge port, the second input end of the power supply module is connected to the second charge and discharge port, and the output end of the power supply module is connected to the switching power supply, for obtaining the electrical signal output by the first charge and discharge port, or the electrical signal output by the second charge and discharge port, and outputting the first power supply signal to the switching power supply module; the switching power supply module is connected to the charge and discharge control module, for outputting the second power supply signal to the charge and discharge control module according to the first power supply signal; the charge and discharge control module is arranged between the first charge and discharge port and the second charge and discharge port, for starting to enter the working mode according to the second power supply signal, and performing charge and discharge control on the first charge and discharge port and the second charge and discharge port, so that the charge and discharge control module can be started by only one switching power supply module, thereby reducing the cost and volume of the charge and discharge control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 is a circuit diagram of a charge and discharge control system according to an embodiment of the present invention;

[0030] Figure 2 is a circuit diagram of a power supply circuit in one embodiment of the present invention;

[0031] Figure 3 FIG. 4 is a circuit diagram of a switching power supply module according to an embodiment of the present invention.

[0032] In the figure: 1. Power supply module; 11. Two power supply circuits; 111. Overcurrent protection circuit; 112. Common-mode suppression circuit; 113. Rectification circuit; 2. Switching power supply module; 3. Charge and discharge control module; 4. First charge and discharge port; 5. Second charge and discharge port. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] It should be understood that the present invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the present invention to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0035] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Thus, a first element, component, region, layer, or portion discussed below may be represented as a second element, component, region, layer, or portion without departing from the teachings of the present invention.

[0036] Spatially relative terms such as "under," "beneath," "beneath," "under," "above," "above," etc., may be used herein for convenience of description to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the drawings is flipped, then the elements or features described as "under" or "beneath" or "beneath" the other elements will be oriented as "over" the other elements or features. Thus, the exemplary terms "under" and "under" can include both the above and below orientations. The device can be oriented otherwise (rotated 90 degrees or in other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0037] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "a", "an" and " / the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "comprising", when used in this specification, identify the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0038] In order to fully understand the present invention, detailed structures and steps will be provided in the following description to illustrate the technical solutions proposed by the present invention. Preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementations.

[0039] This embodiment provides a charge and discharge control system for use in a charging pile. For example, the charging pile may be a bidirectional vehicle-mounted charging pile.

[0040] This embodiment provides a charge and discharge control system, such as Figures 1 to 3 As shown, it includes a power supply module 1, a switching power supply module 2 and a charge and discharge control module 3; the first input end of the power supply module 1 is connected to the first charge and discharge port 4, the second input end of the power supply module 1 is connected to the second charge and discharge port 5, and the output end of the power supply module 1 is connected to the switching power supply, for obtaining the electrical signal output by the first charge and discharge port 4, or the electrical signal output by the second charge and discharge port 5, and outputting the first power supply signal to the switching power supply module 2; the switching power supply module 2 is connected to the charge and discharge control module 3, for outputting the second power supply signal to the charge and discharge control module 3 according to the first power supply signal; the charge and discharge control module 3 is arranged between the first charge and discharge port 4 and the second charge and discharge port 5, for starting to enter the working mode according to the second power supply signal, and controlling the charge and discharge of the first charge and discharge port 4 and the second charge and discharge port 5.

[0041] The first charge / discharge port 4 is used to connect to a power supply or a load device. The power supply can be a power grid or an energy storage device. The load device can be an electrical load or an energy storage device. The second charge / discharge port 5 is used to connect to an electric vehicle.

[0042] As an example, the first input end of the power supply module 1 is connected to the first charge and discharge port 4, the second input end of the power supply module 1 is connected to the second charge and discharge port 5, and the output end of the power supply module 1 is connected to the switching power supply, which is used to obtain the electrical signal output by the first charge and discharge port 4, or the electrical signal output by the second charge and discharge port 5, and output the first power supply signal to the switching power supply module 2. For example, AGND, if the first charge and discharge port 4 is connected to the power supply first, the power supply module 1 can obtain the electrical signal output by the first charge and discharge port 4, and output the first power supply signal to the switching power supply module 2; if the first charge and discharge port 4 is connected to the load device first, the power supply module 1 can obtain the electrical signal output by the second charge and discharge port 5 when the second charge and discharge port 5 is connected to the electric vehicle, and output the first power supply signal to the switching power supply module 2; if the second charge and discharge port 5 is connected to the electric vehicle first, the power supply module 1 can obtain the electrical signal output by the second charge and discharge port 5, and output the first power supply signal to the switching power supply module 2; thereby, the switching power supply module 2 can output the second power supply signal to the charge and discharge control module 3 according to the first power supply signal, so that the charge and discharge control module 3 starts to enter the working mode according to the second power supply signal, and controls the charge and discharge of the first charge and discharge port 4 and the second charge and discharge port 5, so that the charge and discharge control module 3 can be started by only one switching power supply module 2, reducing cost and volume.

[0043] It can be understood that AGND, the charge and discharge control of the first charge and discharge port 4 and the second charge and discharge port 5 includes using the electrical signal provided by the power supply connected to the first charge and discharge port 4 to charge the electric vehicle connected to the second charge and discharge port 5, or using the electrical signal provided by the power battery of the electric vehicle connected to the second charge and discharge port 5 to power the load device connected to the first charge and discharge port 4.

[0044] It should be noted that after the charge and discharge control module 3 is started, the strategy for identifying the first charge and discharge port 4 and the second charge and discharge port 5 for charge and discharge control can adopt techniques well known to those skilled in the art and is not limited here.

[0045] In this embodiment, the charge and discharge control system includes a power supply module 1, a switching power supply module 2 and a charge and discharge control module 3; the first input end of the power supply module 1 is connected to the first charge and discharge port 4, the second input end of the power supply module 1 is connected to the second charge and discharge port 5, and the output end of the power supply module 1 is connected to the switching power supply, for obtaining the electrical signal output by the first charge and discharge port 4, or the electrical signal output by the second charge and discharge port 5, and outputting the first power supply signal to the switching power supply module 2; the switching power supply module 2 is connected to the charge and discharge control module 3, for outputting the second power supply signal to the charge and discharge control module 3 according to the first power supply signal; the charge and discharge control module 3 is arranged between the first charge and discharge port 4 and the second charge and discharge port 5, for starting to enter the working mode according to the second power supply signal, and controlling the charge and discharge of the first charge and discharge port 4 and the second charge and discharge port 5, so that the charge and discharge control module 3 can be started by only one switching power supply module 2, reducing the cost and volume of the charge and discharge control system.

[0046] In one embodiment, the power supply module 1 includes two power supply circuits 11 ; one power supply circuit is provided between the first charge and discharge port 4 and the switching power supply module 2 , and the other power supply circuit is provided between the second charge and discharge port 5 and the switching power supply module 2 .

[0047] As an example, by placing a power supply circuit between the first charge and discharge port 4 and the switching power supply module 2, when the first charge and discharge port 4 is connected to a power supply, the power supply circuit connected to the first charge and discharge port 4 can provide a first power supply signal to the switching power supply module 2 via the electrical signal provided by the power supply. By placing another power supply circuit between the second charge and discharge port 5 and the switching power supply module 2, when the second charge and discharge port 5 is connected to an electric vehicle, the power supply circuit connected to the second charge and discharge port 5 can provide a first power supply signal to the switching power supply module 2 via the electrical signal provided by the electric vehicle. Thus, by utilizing two power supply circuits 11 to draw power from the first charge and discharge port 4 and the second charge and discharge port 5, respectively, and output the first power supply signal to the switching power supply module 2, the charge and discharge control module 3 can be activated using a single switching power supply module 2, reducing cost and size.

[0048] In one embodiment, the power supply circuit includes an overcurrent protection circuit 111, a common-mode suppression circuit 112 and a rectifier circuit 113; the input end of the overcurrent protection circuit 111 is used to connect to the first charge and discharge port 4 or the second charge and discharge port 5, and the output end of the overcurrent protection circuit 111 is connected to the common-mode suppression circuit 112, for performing overcurrent suppression on the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5; the common-mode suppression circuit 112 is connected to the rectifier circuit 113, for performing common-mode suppression on the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5; the rectifier circuit 113 is connected to the switching power supply module 2, for converting the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5 into a DC signal, and outputting a first power supply signal to the switching power supply module 2.

[0049] As an example, the input end of the overcurrent protection circuit 111 is used to connect to the first charge and discharge port 4 or the second charge and discharge port 5, and the output end of the overcurrent protection circuit 111 is connected to the common-mode suppression circuit 112 for overcurrent suppression of the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5. In this example, when the first charge and discharge port 4 is connected to a power supply or the second charge and discharge port 5 is connected to an electric vehicle, in order to prevent the input current from being too large, the overcurrent protection circuit 111 suppresses the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5 to ensure safety during the power supply process.

[0050] As an example, the common-mode suppression circuit 112 is connected to the rectifier circuit 113 and is configured to perform common-mode suppression on the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5 to ensure the stability of the first power supply signal.

[0051] As an example, the rectifier circuit 113 is connected to the switching power supply module 2, and is used to convert the electrical signal output by the first charging and discharging port 4 or the second charging and discharging port 5 into a DC signal, and output a first power supply signal to the switching power supply module 2 to convert the AC signal output by the first charging and discharging port 4 or the second charging and discharging port 5 into a DC signal, and output the first power supply signal to the switching power supply module 2 based on the DC signal to generate a second power supply signal through the switching power supply module 2 for powering the charge and discharge control module 3.

[0052] In this embodiment, the power supply circuit includes an overcurrent protection circuit 111, a common-mode suppression circuit 112 and a rectifier circuit 113; the input end of the overcurrent protection circuit 111 is used to connect to the first charge and discharge port 4 or the second charge and discharge port 5, and the output end of the overcurrent protection circuit 111 is connected to the common-mode suppression circuit 112, for performing overcurrent suppression on the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5; the common-mode suppression circuit 112 is connected to the rectifier circuit 113, for performing common-mode suppression on the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5; the rectifier circuit 113 is connected to the switching power supply module 2, for converting the electrical signal output from the first charge and discharge port 4 or the second charge and discharge port 5 into a DC signal, and outputting a first power supply signal to the switching power supply module 2 to ensure safety and reliability during the power supply process.

[0053] In one embodiment, the overcurrent protection circuit 111 includes a resettable fuse F1. In this embodiment, the overcurrent protection circuit 111 includes a resettable fuse F1. When the current output from the first charge / discharge port 4 or the second charge / discharge port 5 is too large, the resettable fuse F1 is disconnected to prevent safety hazards caused by the excessive current. When the current output from the first charge / discharge port 4 or the second charge / discharge port 5 returns to a safe range, the resettable fuse F1 is restored to a conductive state.

[0054] In one embodiment, the common-mode suppression circuit 112 includes a common-mode inductor L1; a first end of the common-mode inductor L1 is connected to the overcurrent protection circuit 111, and a second end of the common-mode inductor L1 is connected to the rectifier circuit 113. The inductance value of the common-mode inductor L1 can be set based on practical experience and is not limited here. In this embodiment, the first end of the common-mode inductor L1 is connected to the overcurrent protection circuit 111, and the second end of the common-mode inductor L1 is connected to the rectifier circuit 113 to perform common-mode suppression on the electrical signal output from the first charge-discharge port 4 or the second charge-discharge port 5, thereby ensuring the stability of the first power supply signal.

[0055] In one embodiment, the rectifier circuit 113 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The anode of the first diode D1 and the cathode of the second diode D2 are commonly connected to the common-mode suppression circuit 112. The anode of the third diode D3 and the cathode of the fourth diode D4 are commonly connected to the common-mode suppression circuit 112. The cathode of the first diode D1 and the anode of the third diode D3 are commonly connected to (Power_DC) and are connected to the switching power supply module 2. The cathode of the third diode D3 and the anode of the fourth diode D4 are commonly connected to the ground AGND.

[0056] In this embodiment, a rectifier circuit 113 including a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4 is provided in both power supply circuits 11 of the power supply module 1. The rectifier circuit 113 in the two power supply circuits 11 can isolate the first charge and discharge port 4 and the second charge and discharge port 5, thereby ensuring the safety of the charge and discharge control module 3 during the startup process.

[0057] In one embodiment, the withstand voltage of the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 is no less than 4000 volts. In this embodiment, the withstand voltage of the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 is no less than 4000 volts to meet the impulse voltage requirement.

[0058] In one embodiment, the switching power supply module 2 includes a switching power supply chip PW1, a high-voltage capacitor EC1, a low-voltage capacitor EC2, and a filter capacitor C1; the positive input terminal DC+ of the switching power supply chip PW1 is connected to the power supply module 1, and the negative input terminal DC- of the switching power supply chip PW1 is connected to the ground AGND; the positive output terminal VO+ of the switching power supply chip PW1 is connected to the charge and discharge control module 3 (VCC_12V), and the negative output terminal VO- of the switching power supply chip PW1 is connected to the ground AGND; the high-voltage capacitor EC1 is arranged between the positive input terminal DC+ and the negative input terminal DC- of the switching power supply chip PW1; the low-voltage capacitor EC2 and the filter capacitor C1 are arranged in parallel between the positive output terminal VO+ and the negative output terminal VO- of the switching power supply chip PW1.

[0059] The high-voltage capacitor EC1 has a withstand voltage range of 1000 volts to 6000 volts, and the low-voltage capacitor EC2 has a withstand voltage range of less than 50 volts.

[0060] In this embodiment, a high-voltage capacitor EC1, a low-voltage capacitor EC2, and a filter capacitor C1 are provided around the switching power supply chip PW1 to ensure stable and reliable operation of the switching power supply chip PW1. It is understood that the capacitance values ​​of AGND, the high-voltage capacitor EC1, the low-voltage capacitor EC2, and the filter capacitor C1 can be set according to actual needs and are not limited here.

[0061] In one embodiment, the switching power supply chip PW1 is a flyback switching power supply chip PW1. In this embodiment, the switching power supply chip PW1 is a flyback switching power supply chip PW1 to improve the efficiency of the charge and discharge control system, reduce the size and cost of the charge and discharge control system, and at the same time, it has a simple structure, is easy to achieve multi-channel output, and has strong adaptability.

[0062] This embodiment provides a charging pile, including the above-mentioned charging and discharging control system.

[0063] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A charge and discharge control system, characterized in that: Including power supply module, switching power supply module and charge and discharge control module; The first input end of the power supply module is connected to the first charge and discharge port, the second input end of the power supply module is connected to the second charge and discharge port, and the output end of the power supply module is connected to the switching power supply, and is used to obtain the electrical signal output by the first charge and discharge port, or the electrical signal output by the second charge and discharge port, and output a first power supply signal to the switching power supply module; The power supply module includes two power supply circuits; one power supply circuit is arranged between the first charge and discharge port and the switching power supply module, and the other power supply circuit is arranged between the second charge and discharge port and the switching power supply module; The switching power supply module is connected to the charge and discharge control module and is used to output a second power supply signal to the charge and discharge control module according to the first power supply signal; The charge and discharge control module is provided between the first charge and discharge port and the second charge and discharge port, and is used to start the working mode according to the second power supply signal and perform charge and discharge control on the first charge and discharge port and the second charge and discharge port; The power supply circuit includes an overcurrent protection circuit, a common mode suppression circuit and a rectifier circuit; The input end of the overcurrent protection circuit is used to connect to the first charge and discharge port or the second charge and discharge port, and the output end of the overcurrent protection circuit is connected to the common mode suppression circuit, and is used to suppress overcurrent of the electrical signal output by the first charge and discharge port or the second charge and discharge port; The common-mode suppression circuit is connected to the rectifier circuit and is used to perform common-mode suppression on the electrical signal output by the first charge-discharge port or the second charge-discharge port; The rectifier circuit is connected to the switching power supply module, and is used to convert the electrical signal output from the first charging and discharging port or the second charging and discharging port into a DC signal, and output a first power supply signal to the switching power supply module; The rectifier circuit includes a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode and the cathode of the second diode are connected in common and are connected to the common-mode suppression circuit; the anode of the third diode and the cathode of the fourth diode are connected in common and are connected to the common-mode suppression circuit; The cathode of the first diode and the anode of the third diode are commonly connected to the switching power supply module, and the cathode of the third diode and the anode of the fourth diode are commonly connected to the ground.

2. The charge and discharge control system according to claim 1, wherein: The overcurrent protection circuit includes a resettable fuse.

3. The charge and discharge control system according to claim 1, wherein: The common mode suppression circuit includes a common mode inductor; A first end of the common-mode inductor is connected to the overcurrent protection circuit, and a second end of the common-mode inductor is connected to the rectifier circuit.

4. The charge and discharge control system according to claim 1, wherein: The withstand voltage values ​​of the first diode, the second diode, the third diode and the fourth diode are all not less than 4000 volts.

5. The charge and discharge control system according to claim 1, wherein: The switching power supply module includes a switching power supply chip, a high-voltage capacitor, a low-voltage capacitor and a filter capacitor; The positive input electrode of the switching power supply chip is connected to the power supply module, and the negative input electrode of the switching power supply chip is grounded; the positive output electrode of the switching power supply chip is connected to the charge and discharge control module, and the negative output electrode of the switching power supply chip is grounded; The high-voltage capacitor is arranged between the input positive electrode and the input negative electrode of the switching power supply chip; The low-voltage capacitor and the filter capacitor are arranged in parallel between the output positive electrode and the output negative electrode of the switching power supply chip.

6. The charge and discharge control system according to claim 5, wherein: The switching power supply chip is a flyback switching power supply chip.

7. A charging pile, characterized in that: The method comprises the charge and discharge control system according to any one of claims 1 to 6.

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