Pre-charging circuit

Abstract

The utility model provides a pre-charging circuit, the pre-charging circuit comprises an anti-reverse connection module, an on-off control module and a pre-charging module, the anti-reverse connection module is respectively connected to a battery access end and the on-off control module, the on-off control module is also connected to the pre-charging module, and the pre-charging module is also connected to the battery access end and a load. According to the pre-charging circuit provided by the invention, the risks of pre-charging circuit damage and personal injury caused by reverse connection can be prevented.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a pre-charging circuit. Background Art

[0002] An energy storage system refers to a system that can store electrical energy and supply electricity. Currently, in energy storage systems, in order to reduce the instantaneous impact current when the main contactor is energized, a pre-charging circuit is usually used to improve system performance and reliability. However, when using the pre-charging circuit provided in the prior art to pre-charge electrical equipment, once the battery is reversely connected in the pre-charging circuit, it will not only cause heat damage to the components in the pre-charging circuit within the given pre-charging time, but may also cause serious accidents such as smoke and fire, greatly reducing the safety of the entire energy storage system and posing a great threat to personal safety. Utility Model Content

[0003] In view of this, the purpose of the present application is to at least provide a pre-charging circuit, by which the risk of pre-charging circuit damage and personal injury caused by reverse connection can be prevented.

[0004] This application mainly includes the following aspects:

[0005] In the first aspect, an embodiment of the present application provides a pre-charging circuit, which includes an anti-reverse connection module, an on-off control module and a pre-charging module, wherein the anti-reverse connection module is respectively connected to the battery access terminal and the on-off control module, the on-off control module is also connected to the pre-charging module and the load, and the pre-charging module is also connected to the battery access terminal and the load.

[0006] In one possible implementation, the reverse connection prevention module includes a voltage divider circuit and a voltage comparator, wherein the voltage divider circuit is connected between the positive access terminal of the battery and the negative access terminal of the battery and is connected in parallel with the battery access terminal, one end of the voltage divider circuit is connected to the positive input terminal of the voltage comparator, and the other end of the voltage divider circuit is connected to the negative input terminal of the voltage comparator, one end of the voltage divider circuit is close to the positive access terminal of the battery, and the other end of the voltage divider circuit is close to the negative access terminal of the battery, and the output end of the voltage comparator is connected to the on-off control module; the negative access terminal is connected to the negative pole of the first power supply.

[0007] In a possible implementation manner, the anti-reverse connection module further includes a first capacitor, wherein one end of the first capacitor is connected to the positive power supply access terminal, and the other end of the first capacitor is connected to the first ground terminal.

[0008] In one possible implementation, the voltage divider circuit includes a plurality of voltage divider resistors connected in series, wherein the positive input terminal of the voltage comparator is connected to one end of the target voltage divider resistor, which is close to the positive access terminal of the battery, the negative input terminal of the voltage comparator is connected to the other end of the target voltage divider resistor, which is close to the negative access terminal of the battery, the output terminal of the voltage comparator is connected to the on-off control module, and the target voltage divider resistor is any one of the plurality of voltage divider resistors or any plurality of them connected in series adjacent to each other.

[0009] In one possible implementation, the on-off control module includes a first control switch, a second control switch and a third control switch, wherein the control end of the first control switch, the control end of the second control switch and the control end of the third control switch are all connected to the output end of the voltage comparator; the first connection end of the first control switch is connected to the negative access end of the battery, the first connection end of the second control switch is respectively connected to the first connection end of the third control switch and the pre-charging module, and the first connection end of the third control switch is connected to the pre-charging module; after the second connection end of the first control switch, the second connection end of the second control switch and the second connection end of the third control switch are connected, they are connected to the negative pole of the load and the first grounding terminal, and the positive pole of the load is respectively connected to the pre-charging module and the positive access end of the battery.

[0010] In one possible implementation, the pre-charging circuit further includes a buffer resistor, wherein one end of the buffer resistor is connected to the second connection terminal of the second control switch, and the other end of the buffer resistor is respectively connected to the second connection terminal of the first control switch, the second connection terminal of the third control switch, the first ground terminal and the negative electrode of the load.

[0011] In one possible implementation, the pre-charging circuit also includes an anti-shock capacitor and an anti-shock resistor, wherein one end of the anti-shock resistor is connected to the output end of the voltage comparator, the other end of the anti-shock resistor is respectively connected to the control end of the third control switch and one end of the anti-shock capacitor, and the other end of the anti-shock capacitor is respectively connected to the second connection end of the first control switch, the second connection end of the third control switch, the first ground end and the negative electrode of the load.

[0012] In one possible implementation, the pre-charge module includes a first pre-charge capacitor and a second pre-charge capacitor, wherein after the first pre-charge capacitor and the second pre-charge capacitor are connected in parallel, one end of the first pre-charge capacitor is respectively connected to the positive access terminal of the battery and the positive electrode of the load, and the other end is respectively connected to the first connection terminal of the second control switch and the first connection terminal of the third control switch.

[0013] In a possible implementation manner, the pre-charging circuit further includes a battery reverse connection prompt module, and the battery reverse connection prompt module is connected to the output terminal of the voltage comparator and the first ground terminal.

[0014] In one possible implementation, the battery reverse connection prompt module includes a second capacitor, a first resistor, a second resistor, an optocoupler switch and an indicator light, wherein one end of the second capacitor is connected to the output end of the voltage comparator, the other end of the second capacitor is connected to the first connection end and the first ground end of the optocoupler switch, the second connection end of the optocoupler switch is connected to one end of the first resistor, the other end of the first resistor is connected to the output end of the voltage comparator, the third connection end of the optocoupler switch is connected to the anode of the indicator light, the fourth connection end of the optocoupler switch is connected to one end of the second resistor, and the other end of the second resistor is connected to the second power supply; the cathode of the indicator light is connected to the second ground end.

[0015] A pre-charging circuit provided by an embodiment of the present application includes an anti-reverse connection module, an on-off control module and a pre-charging module, wherein the anti-reverse connection module is respectively connected to the battery access terminal and the on-off control module, the on-off control module is also connected to the pre-charging module, and the pre-charging module is respectively connected to the battery access terminal, the anti-reverse connection module and the load. The pre-charging circuit provided by the present application can prevent the risk of pre-charging circuit damage and personal injury caused by reverse connection.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 One of the structural schematic diagrams of a pre-charging circuit provided in an embodiment of the present application is shown;

[0019] Figure 2 A second structural schematic diagram of a pre-charging circuit provided in an embodiment of the present application is shown;

[0020] Figure 3 A third structural schematic diagram of a pre-charging circuit provided in an embodiment of the present application is shown;

[0021] Figure 4 A fourth structural schematic diagram of a pre-charging circuit provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0023] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0024] An energy storage system refers to a system that can store electrical energy and supply power. Currently in energy storage systems, in order to adapt to different types of energy storage inverters and to reduce the instantaneous impact current when the main contactor is energized, the battery system usually uses a pre-charging circuit to improve system performance and reliability. However, when using the pre-charging circuit provided in the prior art to pre-charge electrical equipment, once the battery is reversely connected in the pre-charging circuit, it will not only cause heat damage to the components in the pre-charging circuit within the given pre-charging time, but may also cause serious accidents such as smoke and fire, greatly reducing the safety of the entire energy storage system and posing a great threat to personal safety.

[0025] Based on this, the embodiment of the present application provides a pre-charging circuit, which can prevent the risk of pre-charging circuit damage and personal injury caused by reverse connection, as follows:

[0026] See also Figure 1 , Figure 1 FIG. 1 shows one of the structural schematic diagrams of a pre-charging circuit provided in an embodiment of the present application. Figure 1 As shown, the pre-charging circuit provided in the embodiment of the present application includes an anti-reverse connection module 1, an on-off control module 2 and a pre-charging module 3, wherein the anti-reverse connection module 1 is respectively connected to the battery access terminal 4 and the on-off control module 2, the on-off control module 2 is also connected to the pre-charging module 3 and the load 5, and the pre-charging module 3 is also connected to the battery access terminal 4 and the load 5.

[0027] like Figure 1 As shown, the pre-charging circuit further includes a battery reverse connection prompting module 6 , and the battery reverse connection prompting module 6 is connected to the anti-reverse connection module 1 .

[0028] In such Figure 1 In the pre-charging circuit shown, the battery is connected to the entire pre-charging circuit through the battery access terminal 4, and then the anti-reverse connection module 1 determines the battery access status signal and outputs it to the on-off control module 2. If the access status signal indicates that the battery is reversely connected, the on-off control module 2 controls the circuit conduction between the battery, the pre-charging module 3 and the load 5, so that the battery pre-charges the load 5 through the pre-charging module 3, and the battery reverse connection prompt module 6 does not work. If the access status signal indicates that the battery access is normal, the on-off control module 2 controls the circuit disconnection between the battery, the pre-charging module 3 and the load 5, and disconnects the pre-charging function. At the same time, the battery reverse connection prompt module 6 performs a battery reverse connection prompt after receiving the battery reverse connection signal.

[0029] exist Figure 1 In the pre-charging circuit shown, by adding an anti-reverse connection module 1 and an on-off control module 2 between the battery and the pre-charging module, the pre-charging function formed between the battery and the pre-charging module 3 can be quickly disconnected when the battery is reversely connected, and further a subsequent reverse connection prompt is performed by the battery reverse connection prompt module 6, thereby ensuring that the pre-charging circuit is not affected by the reverse connection of the battery. Furthermore, various accidents such as heat damage to various components in the pre-charging circuit due to reverse connection of the battery can be effectively avoided, thereby greatly improving the safety of the entire energy storage system and improving personal safety.

[0030] See also Figure 2 , Figure 2 FIG. 2 shows a second structural schematic diagram of a pre-charging circuit provided in an embodiment of the present application. Figure 2 As shown, the reverse connection prevention module includes a voltage divider circuit 11 and a voltage comparator 12, and the battery access terminal includes a battery positive access terminal BAT+ and a battery negative access terminal BAT-.

[0031] The voltage divider circuit 11 is connected between the battery positive access terminal BAT+ and the battery negative access terminal BAT-, and is connected in parallel with the battery access terminal. One end of the voltage divider circuit 11 is connected to the positive input terminal of the voltage comparator 12, and the other end of the voltage divider circuit 11 is connected to the negative input terminal of the voltage comparator 12. The other end of the voltage divider circuit 11 is connected to the negative input terminal of the voltage comparator 12. One end of the voltage divider circuit 11 is close to the battery positive access terminal BAT+, and the other end of the voltage divider circuit 11 is close to the battery negative access terminal BAT-. The output end of the voltage comparator 12 is connected to the on-off control module 2 and the battery reverse connection prompt module 6. The on-off control module 2 is also connected in series with the pre-charging module 3 and connected between the battery positive access terminal BAT+ and the battery negative access terminal BAT-, as well as between the load positive electrode P+ and the load negative electrode P-. That is, the series circuit formed by the pre-charging module 3 and the on-off control module 2 is in parallel with the battery access terminal 4, the voltage divider circuit 11 and the load.

[0032] For the anti-reverse connection module, after the battery is connected to the pre-charging circuit through the battery positive access terminal BAT+ and the battery negative access terminal BAT-, corresponding voltages are generated at both ends of the voltage divider circuit 11. Specifically, the voltage at one end of the voltage divider circuit 11 is input to the positive input end of the voltage comparator 12, and the voltage at the other end of the voltage divider circuit 11 is input to the negative input end of the voltage comparator 12. When the battery is not reversely connected, the voltage at one end of the voltage divider circuit 11 is greater than the voltage at the other end of the voltage divider circuit 11. At this time, the voltage comparator 12 outputs a high level signal to the on-off switch. The control module 2 and the battery reverse connection prompt module 6, the on-off control module 2 controls the circuit conduction between the battery and the pre-charging module 3 to realize the pre-charging function. At the same time, the battery reverse connection prompt module 6 has no reverse connection prompt. When the battery is reversely connected, the voltage at one end of the voltage divider circuit 11 is less than the voltage at the other end of the voltage divider circuit 11. At this time, the voltage comparator 12 outputs a low-level signal to the on-off control module 2. The on-off control module 2 controls the circuit disconnection between the battery and the pre-charging module 3 to disconnect the pre-charging function, and the battery reverse connection prompt module 6 performs a reverse connection prompt.

[0033] See also Figure 3 , Figure 3 FIG. 3 shows a structural schematic diagram of a pre-charging circuit provided in an embodiment of the present application. Figure 3 As shown, the anti-reverse connection module also includes a first capacitor C1, the positive power supply access terminal of the voltage comparator 12 is connected to the positive electrode VP+ of the first power supply, the negative power supply access terminal of the voltage comparator 12 is connected to the negative electrode VP- of the first power supply, one end of the first capacitor C1 is connected to the positive power supply access terminal VP+, and the other end of the first capacitor C1 is connected to the first ground terminal PGND.

[0034] The on-off control module 2 includes a first control switch Q1, a second control switch Q2 and a third control switch Q3, the pre-charging circuit also includes a buffer resistor R3, an anti-shock capacitor C3 and an anti-shock resistor R4, and the pre-charging module 3 includes a first pre-charging capacitor C4 and a second pre-charging capacitor C5.

[0035] The control end of the first control switch Q1 and the control end of the second control switch Q2 are both connected to the output end of the voltage comparator 12 .

[0036] One end of the anti-shock resistor R4 is connected to the output end of the voltage comparator 12, and the other end of the anti-shock resistor R4 is respectively connected to the control end of the third control switch Q3 and one end of the anti-shock capacitor C3, and the other end of the anti-shock capacitor C3 is respectively connected to the first ground terminal PGND and the load negative electrode P-.

[0037] The first connection end of the first control switch Q1 is connected to the negative access terminal BAT- of the battery. After the first pre-charge capacitor C4 and the second pre-charge capacitor C5 are connected in parallel, one end is respectively connected to the positive access terminal BAT+ of the battery and the positive electrode P+ of the load, and the other end is respectively connected to the first connection end of the second control switch Q2 and the first connection end of the third control switch Q3.

[0038] The second connection end of the first control switch Q1 and the second connection end of the third control switch Q3 are connected to the load cathode P− and the first ground terminal PGND, respectively.

[0039] One end of the buffer resistor R3 is connected to the second connection end of the second control switch Q2, and the other end of the buffer resistor R3 is connected to the first ground end PGND and the load negative electrode P−.

[0040] The battery reverse connection prompt module 6 includes a second capacitor C2, a first resistor R1, a second resistor R2, an optical coupler switch K1 and an indicator LED.

[0041] In a preferred embodiment, one end of the second capacitor C2 is connected to the output end of the voltage comparator 12, the other end of the second capacitor C2 is connected to the first connection end of the optocoupler switch K1 and the first ground terminal PGND, the second connection end of the optocoupler switch K2 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the output end of the voltage comparator 12, the third connection end of the optocoupler switch K1 is connected to the anode of the indicator light LED, the fourth connection end of the optocoupler switch K1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the second power supply VS, and the cathode of the indicator light LED is connected to the second ground terminal GNDS.

[0042] In a preferred embodiment, the voltage divider circuit includes multiple voltage divider resistors connected in series, the positive input terminal of the voltage comparator is connected to one end of the target voltage divider resistor, one end of the target voltage divider resistor is close to the positive access terminal of the battery, the negative input terminal of the voltage comparator is connected to the other end of the target voltage divider resistor, the other end of the target voltage divider resistor is close to the negative access terminal of the battery, the output terminal of the voltage comparator is connected to the on-off control module, and the target voltage divider resistor is any one of the multiple voltage divider resistors or any multiple ones connected in series adjacent to each other.

[0043] That is to say, the input end of the voltage comparator can be connected to both ends of any adjacent multiple voltage-dividing resistors connected in series.

[0044] Specifically, the voltage across the target voltage-dividing resistor must be within the rated input range corresponding to the voltage comparator.

[0045] See also Figure 4 , Figure 4 FIG4 shows a structural diagram of a pre-charging circuit provided in an embodiment of the present application. Figure 4 In the pre-charging circuit shown, the voltage-dividing circuit includes a first voltage-dividing resistor R5, a second voltage-dividing resistor R6 and a third voltage-dividing resistor R7 connected in series, and the second voltage-dividing resistor R6 is a target voltage-dividing resistor, wherein one end of the first voltage-dividing resistor R5 is connected to the positive access terminal BAT+ of the battery, the other end of the first voltage-dividing resistor R5 is connected to one end of the second voltage-dividing resistor R6, one end of the second voltage-dividing resistor R6 is also connected to the positive input terminal of the voltage comparator 12, the other end of the second voltage-dividing resistor R6 is respectively connected to one end of the third voltage-dividing resistor R7 and the negative input terminal of the voltage comparator 12, and the other end of the third voltage-dividing resistor R7 is connected to the negative access terminal BAT- of the battery.

[0046] like Figure 3 In the illustrated embodiment, the voltage comparator 12 can open or close the on-off control module by collecting the voltage across the second voltage-dividing resistor R6, so as to realize on-off control of the circuit between the battery and the load.

[0047] Specifically, when the voltage at one end of the second voltage-dividing resistor R6 is greater than the voltage at the other end of the second voltage-dividing resistor R6 (the voltage collected at the positive input end of the voltage comparator 12 is greater than the voltage collected at the negative input end of the voltage comparator 12), the battery is deemed to be normally connected to the pre-charging circuit. At this time, the output of the voltage comparator 12 is a forward voltage, and this forward voltage will first drive the first switch control module Q1 to turn on.

[0048] For the second switch control module Q2, after the battery is pre-charged through the first pre-charge capacitor C4 and the second pre-charge capacitor C5, the second switch control module Q2 will be turned on, and the buffer resistor R3 can play a buffering role when the battery charges the capacitor. Since the anti-shock capacitor C3 and the anti-shock resistor R4 are connected between the third switch control module Q3 and the input end of the voltage comparator 12 (in order to protect the third control switch control module Q3 from power-on shock), after the voltage comparator 12 outputs a forward voltage, compared with the first control switch control module Q1 and the second control switch control module Q2, after the battery is pre-charged through the first pre-charge capacitor C4 and the second pre-charge capacitor C5, it will still be delayed for a preset time to be turned on (this preset time depends on the values ​​of R4 and C3).

[0049] When the voltage at the other end of the second voltage-dividing resistor R6 is greater than the voltage at one end of the second voltage-dividing resistor R6 (the voltage collected at the positive input end of the voltage comparator 12 is less than the voltage collected at the negative input end of the voltage comparator 12), it is regarded as the battery is reversed. At this time, the output end of the voltage comparator 12 outputs a negative voltage, and the first control switch Q1, the second control switch Q2 and the third control switch Q3 are all turned off. At the same time, the negative voltage turns on the optocoupler switch K1, thereby lighting the indicator LED to remind the user that the battery has been reversed.

[0050] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0051] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0052] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0053] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0054] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pre-charging circuit, characterized in that: The pre-charging circuit includes an anti-reverse connection module, an on-off control module and a pre-charging module. The anti-reverse connection module is respectively connected to the battery access terminal and the on-off control module, the on-off control module is also connected to the pre-charging module and the load, and the pre-charging module is also connected to the battery access terminal and the load.

2. The precharge circuit according to claim 1, characterized in that The anti-reverse connection module includes a voltage divider circuit and a voltage comparator. Wherein, the voltage divider circuit is connected between the positive access terminal of the battery and the negative access terminal of the battery, and is connected in parallel with the battery access terminal, one end of the voltage divider circuit is connected to the positive input terminal of the voltage comparator, and the other end of the voltage divider circuit is connected to the negative input terminal of the voltage comparator, one end of the voltage divider circuit is close to the positive access terminal of the battery, and the other end of the voltage divider circuit is close to the negative access terminal of the battery, and the output end of the voltage comparator is connected to the on-off control module; The positive power supply access terminal of the voltage comparator is connected to the positive electrode of the first power supply, and the negative power supply access terminal of the voltage comparator is connected to the negative electrode of the first power supply.

3. The precharge circuit according to claim 2, characterized in that: The anti-reverse connection module also includes a first capacitor, One end of the first capacitor is connected to the positive power supply access terminal, and the other end of the first capacitor is connected to the first ground terminal.

4. The precharge circuit according to claim 2, characterized in that: The voltage divider circuit includes a plurality of voltage divider resistors connected in series. Among them, the positive input end of the voltage comparator is connected to one end of the target voltage-dividing resistor, and one end of the target voltage-dividing resistor is close to the positive access terminal of the battery. The negative input end of the voltage comparator is connected to the other end of the target voltage-dividing resistor, and the other end of the target voltage-dividing resistor is close to the negative access terminal of the battery. The output end of the voltage comparator is connected to the on-off control module, and the target voltage-dividing resistor is any one of the multiple voltage-dividing resistors or any multiple ones connected in series adjacent to each other.

5. The precharge circuit according to claim 2, characterized in that: The on-off control module includes a first control switch, a second control switch and a third control switch. Wherein, the control end of the first control switch, the control end of the second control switch and the control end of the third control switch are all connected to the output end of the voltage comparator; The first connection end of the first control switch is connected to the negative access end of the battery, the first connection end of the second control switch is respectively connected to the first connection end of the third control switch and the pre-charging module, and the first connection end of the third control switch is connected to the pre-charging module; After the second connection end of the first control switch, the second connection end of the second control switch and the second connection end of the third control switch are connected, they are connected to the negative electrode of the load and the first grounding end, and the positive electrode of the load is respectively connected to the pre-charging module and the positive access end of the battery.

6. The precharge circuit according to claim 5, characterized in that: The pre-charging circuit further includes a buffer resistor, One end of the buffer resistor is connected to the second connection end of the second control switch, and the other end of the buffer resistor is respectively connected to the second connection end of the first control switch, the second connection end of the third control switch, the first ground end and the negative electrode of the load.

7. The precharge circuit according to claim 5, characterized in that: The pre-charging circuit also includes an anti-shock capacitor and an anti-shock resistor. Among them, one end of the anti-shock resistor is connected to the output end of the voltage comparator, the other end of the anti-shock resistor is respectively connected to the control end of the third control switch and one end of the anti-shock capacitor, and the other end of the anti-shock capacitor is respectively connected to the second connection end of the first control switch, the second connection end of the third control switch, the first ground end and the negative electrode of the load.

8. The precharge circuit according to claim 5, characterized in that: The pre-charge module includes a first pre-charge capacitor and a second pre-charge capacitor. Among them, after the first pre-charge capacitor and the second pre-charge capacitor are connected in parallel, one end is connected to the positive access end of the battery and the positive electrode of the load respectively, and the other end is connected to the first connection end of the second control switch and the first connection end of the third control switch respectively.

9. The precharge circuit according to claim 2, characterized in that: The pre-charging circuit also includes a battery reverse connection prompt module, The battery reverse connection prompt module is connected to the output terminal of the voltage comparator and the first ground terminal.

10. The precharge circuit according to claim 9, characterized in that: The battery reverse connection prompt module includes a second capacitor, a first resistor, a second resistor, an optical coupler switch and an indicator light. Wherein, one end of the second capacitor is connected to the output end of the voltage comparator, the other end of the second capacitor is connected to the first connection end and the first ground end of the optocoupler switch, the second connection end of the optocoupler switch is connected to one end of the first resistor, the other end of the first resistor is connected to the output end of the voltage comparator, the third connection end of the optocoupler switch is connected to the anode of the indicator light, the fourth connection end of the optocoupler switch is connected to one end of the second resistor, and the other end of the second resistor is connected to a second power supply; The cathode of the indicator light is connected to the second ground terminal.

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