Pre-charging circuit of vehicle battery, control method, electronic equipment and medium
Through electronic precharge circuits, including precharge control circuits and carbon film resistors, the precharge circuits in the prior art are solved, which are large in size, difficult to layout and high cost, and achieves more flexible layout and lower production costs.
Patent Information
- Application Number
- CN202411121367.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2024-12-17
AI Technical Summary
The existing vehicle battery precharge circuit is large in size, difficult to layout, low flexibility and high cost, resulting in low production efficiency and high labor costs.
The electronic precharge circuit is adopted, including precharge control circuit, MOS tube and carbon film precharge resistor, and the precharge function is realized through the electronic circuit, reducing volume, improving layout flexibility, and reducing costs.
It has achieved the reduction of space, improved layout flexibility and reduced cost of pre-charge circuits, simplified production processes, reduced labor costs, and is suitable for pre-charge functions of new energy vehicles.
Smart Images
Figure CN119154439A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of circuit technology, and in particular to a pre-charging circuit, a control method, an electronic device and a medium for a vehicle battery. Background Art
[0002] In the energy circuit of new energy vehicles, the battery pack, as the energy source, controls the on / off of the energy circuit through the on / off of the main contactor, and provides DC energy to the load. At the same time, some load controllers such as motor controllers (MCU), DC converters and other components have large-capacity busbar support / filter capacitors. Due to the inherent characteristics of capacitors "AC-pass, DC-resistance", at the moment of power-on, the capacitor is equivalent to a short circuit, which will cause a sudden large current shock. In order to protect the load components from damage caused by the sudden large current shock, each manufacturer will connect a pre-charging circuit in parallel with the main contactor, including a pre-charging contactor and a pre-charging resistor; before the main contactor is closed, the pre-charging contactor is closed first, because the existence of the pre-charging resistor can avoid the short circuit of the capacitor in the load and protect the load components from the sudden large current shock.
[0003] In the current solution, pre-charge contactors and pre-charge resistors are generally placed together with other contactors and fuses to form a power distribution unit (PDU). The control signal line of the contactor coil is led to the vehicle controller (VCU), and the VCU controls the on / off of the contactor through hard wiring. Pre-charge contactors generally use round or square DC contactors and are fixed with bolts; pre-charge resistors generally use gold aluminum shell resistors and are also fixed with bolts. However, this method takes up a large space, is not easy to layout, has low flexibility, and requires manual fixing and wiring, which reduces production efficiency. When adapting to different models, if the pre-charge contactors and pre-charge resistors need to adjust parameters or change brands, it involves the re-layout of the power distribution unit (PDU), re-positioning of the mounting holes, and rearrangement of the wiring harness, which increases labor costs and reduces production efficiency. Summary of the invention
[0004] In view of this, the purpose of the present application is to provide a pre-charging circuit, control method, electronic device and medium for a vehicle battery to solve the problems existing in the prior art of large pre-charging circuit size, difficult layout, low flexibility and high cost.
[0005] The embodiment of the present application provides a pre-charging circuit of a vehicle battery, the pre-charging circuit comprising: a pre-charging control circuit, a MOS tube and a carbon film pre-charging resistor;
[0006] One end of the pre-charge control circuit is connected to the pre-charge controller, and the other end of the pre-charge control circuit is connected to the gate of the MOS tube; the drain of the MOS tube is connected to the first contact in the main contactor as one end of the pre-charge circuit; the source of the MOS tube is connected to one end of the carbon film pre-charge resistor, and the other end of the carbon film pre-charge resistor is connected to the second contact in the main contactor as the other end of the pre-charge circuit;
[0007] One end of the coil in the main contactor is connected to the vehicle controller, and the other end of the coil is grounded; the first contact is also connected to the positive pole of the battery pack, the second contact is also connected to the input end of the vehicle load, and the output end of the vehicle load is connected to the negative pole of the battery pack.
[0008] Further, the pre-charge control circuit includes a gate resistor, a diode and a gate capacitor;
[0009] The pre-charge controller is connected to one end of the gate resistor, and the other end of the gate resistor is connected to the gate of the MOS tube; the other end of the gate resistor is also connected to one end of the gate capacitor, and the other end of the gate capacitor is grounded; the pre-charge controller is also connected to one end of the diode, and the other end of the diode is grounded.
[0010] Furthermore, the pre-charging controller is a vehicle controller or a load controller.
[0011] Furthermore, the pre-charging circuit is integrated in the load controller.
[0012] Furthermore, the MOS tube is an NMOS tube, and the NMOS tube is packaged in a D2PAK chip.
[0013] Furthermore, the carbon film pre-charging resistor is two parallel plug-in resistors; the carbon film pre-charging resistor adopts a plug-in package.
[0014] The embodiment of the present application further provides a control method for a pre-charging circuit, the control method being used to control the pre-charging circuit as described above; the control method comprising:
[0015] When the pre-charge controller is a load controller, the vehicle controller sends a pre-charge closing instruction to the load controller in response to a vehicle power-on signal;
[0016] The load controller controls the MOS tube to close in response to the pre-charge closing instruction, generates a pre-charge state signal and sends it to the vehicle controller;
[0017] When the pre-charging state signal indicates that the pre-charging is successful, the vehicle controller drives the main contactor to close;
[0018] After a predetermined time has passed, the vehicle controller sends a pre-charge disconnection instruction to the load controller;
[0019] The load controller controls the MOS tube to be disconnected in response to the pre-charge disconnection instruction.
[0020] Furthermore, the load controller generates the pre-charge state signal in the following manner:
[0021] The load controller detects the on / off state of the MOS tube and the bus voltage of the vehicle load;
[0022] When the MOS tube is closed and the bus voltage exceeds a preset threshold, a pre-charging state signal indicating that the pre-charging is successful is generated.
[0023] An embodiment of the present application also provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the control method of the pre-charging circuit as described above are performed.
[0024] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the pre-charging circuit as described above are executed.
[0025] The embodiments of the present application provide a pre-charging circuit, control method, electronic device and medium for a vehicle battery, wherein the pre-charging circuit includes: a pre-charging control circuit, a MOS tube and a carbon film pre-charging resistor; one end of the pre-charging control circuit is connected to the pre-charging controller, and the other end of the pre-charging control circuit is connected to the gate of the MOS tube; the drain of the MOS tube is connected to the first contact in the main contactor as one end of the pre-charging circuit; the source of the MOS tube is connected to one end of the carbon film pre-charging resistor, and the other end of the carbon film pre-charging resistor is connected to the second contact in the main contactor as the other end of the pre-charging circuit; one end of the coil in the main contactor is connected to the vehicle controller, and the other end of the coil is grounded; the first contact is also connected to the positive electrode of the battery pack, the second contact is also connected to the input end of the vehicle load, and the output end of the vehicle load is connected to the negative electrode of the battery pack.
[0026] By realizing the pre-charging function through an electronic circuit, the volume of the pre-charging circuit and the space occupied can be reduced; the electronic pre-charging circuit can be more flexibly combined with the load circuit and does not need to be fixedly placed inside the power distribution unit, which can increase the flexibility of component layout and reduce the volume of the power distribution unit; at the same time, because electronic devices are standardized in packaging and low in price, it can reduce the overall device cost, reduce wiring, reduce labor costs, improve production efficiency, and facilitate mass production.
[0027] 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
[0028] 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.
[0029] Figure 1 One of the structural schematic diagrams of a pre-charging circuit of a vehicle battery provided in an embodiment of the present application is shown;
[0030] Figure 2 A second structural schematic diagram of a pre-charging circuit of a vehicle battery provided in an embodiment of the present application is shown;
[0031] Figure 3 A flow chart of a control method for a pre-charging circuit provided in an embodiment of the present application is shown;
[0032] Figure 4 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION
[0033] 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. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different 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, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.
[0034] After research, it was found that in the current scheme, pre-charge contactors and pre-charge resistors are generally placed together with other contactors and fuses to form a power distribution unit (PDU). The control signal line of the contactor coil is led to the vehicle controller (VCU), and the VCU realizes the on / off control of the contactor through hard wiring. Pre-charge contactors generally use round or square DC contactors, which are fixed by bolts; pre-charge resistors generally use gold aluminum shell resistors, which are also fixed by bolts. However, this method takes up a large space, is not easy to layout, has low flexibility, and requires manual fixing and wiring, which reduces production efficiency. When adapting to different models, if the pre-charge contactors and pre-charge resistors need to adjust parameters or change brands, it involves the re-layout of the power distribution unit (PDU), re-positioning of the mounting holes, and rearrangement of the wiring harness, which increases labor costs and reduces production efficiency.
[0035] Research in the embodiments of the present application found that the pre-charging circuit only works when the new energy vehicle is powered on, has a short working time, and the current flowing through it is very small. Therefore, the function of the pre-charging circuit can be achieved through an electronic circuit.
[0036] Based on this, an embodiment of the present application provides a pre-charging circuit for a vehicle battery to realize the pre-charging function through an electronic circuit, thereby solving the problems of large size, difficult layout, low flexibility and high cost of the pre-charging circuit in the prior art.
[0037] See also Figure 1 , Figure 1 This is one of the structural schematic diagrams of a vehicle battery pre-charging circuit provided in an embodiment of the present application. Figure 1 As shown in the figure, the pre-charging circuit 100 provided in the embodiment of the present application includes: a pre-charging control circuit 101, a MOS tube 102 and a carbon film pre-charging resistor 103. In the specific implementation, a power MOSFET (MOS tube) is selected as the on / off control switch of the pre-charging circuit 100, and a carbon film resistor is selected to replace the gold aluminum shell resistor as the pre-charging resistor for current limiting.
[0038] Optionally, the MOS tube 102 is an NMOS tube, and the NMOS tube adopts a D2PAK chip package with a high withstand voltage of 650V and an Ids of 20A. The D2PAK package is a mainstream universal package for MOSFET, which is compatible with different MOSFET brands and models and has a wide adaptability. The carbon film resistor can be connected in parallel with two 3W direct-insertion resistors to reduce the loop resistance and increase the flow capacity. The direct-insertion resistor is low in price, has good compatibility, and is widely adaptable.
[0039] One end of the pre-charge control circuit 101 is connected to the pre-charge controller 104, and the other end of the pre-charge control circuit 101 is connected to the gate (G pole) of the MOS tube 102; the drain (D pole) of the MOS tube 102 is connected to the first contact in the main contactor 105 as one end of the pre-charge circuit 100; the source (S pole) of the MOS tube 102 is connected to one end of the carbon film pre-charge resistor 103, and the other end of the carbon film pre-charge resistor 103 is connected to the second contact in the main contactor 105 as the other end of the pre-charge circuit 100.
[0040] Here, a contactor is an electrical control device that is mainly used to connect and disconnect circuits at a distance, usually for controlling motors or other high-power loads. A contactor can carry and switch large currents, and is suitable for occasions where it is frequently operated and runs for a long time. A contactor mainly includes contacts and coils; the contacts are the main working parts of the contactor, used to connect and disconnect circuits, and the contacts are usually divided into normally open contacts (NO) and normally closed contacts (NC). The coil is the control part of the contactor, which generates a magnetic field by applying voltage to drive the action of the contacts.
[0041] One end of the coil in the main contactor 105 is connected to the vehicle controller 106, and the other end of the coil is grounded; the first contact is also connected to the positive pole of the battery pack 107, and the second contact is also connected to the input end of the vehicle load 108, and the output end of the vehicle load 108 is connected to the negative pole of the battery pack 107.
[0042] In a specific implementation, the vehicle controller 106 generates a magnetic field by applying voltage to the coil to control the opening or closing of the contacts, thereby opening or closing the power supply circuit between the battery pack 107 and the vehicle load 108.
[0043] Here, the gate (G) of NMOS serves as the control pin for turning NMOS on / off, and can be connected to the vehicle controller 106 (VCU), or to a load controller, such as a motor controller (MCU) or a DC converter, to control the on / off of NMOS.
[0044] Since NMOS is a D2PAK chip package, the carbon film resistor is a plug-in package, and the peripheral filtering and current limiting devices are all chip devices, the pre-charging circuit 100 can be made into a circuit board of very small size. In addition, the pre-charging circuit 100 is connected to the battery high voltage circuit, so the electronic pre-charging circuit 100 can be integrated with a load controller circuit with high voltage input / collection, such as a motor controller (MCU) or a DC converter, that is, integrated in the load controller.
[0045] See also Figure 2 , Figure 2 This is a second structural schematic diagram of a pre-charging circuit of a vehicle battery provided in an embodiment of the present application. Figure 2 As shown in the figure, the pre-charge control circuit 101 includes a gate resistor 1, a diode 2 and a gate capacitor 3. The pre-charge controller 104 can change the gate voltage through the pre-charge control circuit 101, thereby realizing the switch control function, so that the MOS tube 102 can be used as an on / off control switch of the pre-charge circuit 100.
[0046] The pre-charge controller 104 is connected to one end of the gate resistor 1, and the other end of the gate resistor 1 is connected to the gate of the MOS tube 102; the other end of the gate resistor 1 is also connected to one end of the gate capacitor 3, and the other end of the gate capacitor 3 is grounded; the pre-charge controller 104 is also connected to one end of the diode 2, and the other end of the diode 2 is grounded.
[0047] The pre-charge control circuit can protect and control the gate voltage within a reasonable working range, improve the performance, stability and reliability of the MOS tube, and ensure that it can work normally under the control of the pre-charge controller.
[0048] A pre-charging circuit for a vehicle battery provided in an embodiment of the present application realizes the pre-charging function through an electronic circuit, which can reduce the volume of the pre-charging circuit and the space occupied; the electronic pre-charging circuit can be more flexibly combined with the load circuit and does not need to be fixedly placed inside the power distribution unit; for example, integration with a load controller can improve the degree of integration, increase the flexibility of component layout, and reduce the volume of the power distribution unit; at the same time, because the electronic components are standardized in packaging and low in price, the material cost of the overall device can be reduced, wiring can be reduced, labor costs can be reduced, production efficiency can be improved, and mass production can be more convenient.
[0049] See also Figure 3 , Figure 3 Flow chart of a control method for a pre-charging circuit provided in an embodiment of the present application. The control method provided in an embodiment of the present application is used to control any pre-charging circuit as described above; Figure 3 As shown in , the control method includes:
[0050] S301. When the pre-filling controller is a load controller, the vehicle controller sends a pre-filling closing instruction to the load controller in response to a vehicle power-on signal.
[0051] When the pre-charging controller is a load controller, or after the electronic pre-charging circuit in the embodiment of the present application is integrated into the load controller, since the on / off control of the main contactor is still controlled by the vehicle controller (VCU), the on / off control of the pre-charging circuit requires CAN communication interactive control between the vehicle controller (VCU) and the load controller.
[0052] Specifically, when the new energy vehicle meets the power-on conditions, in response to the received power-on signal, the vehicle controller sends a pre-charge closing instruction to the load controller.
[0053] S302. The load controller controls the MOS tube to close in response to the pre-charge closing instruction, generates a pre-charge state signal and sends it to the vehicle controller.
[0054] In this step, the load controller controls the MOS tube to close in response to the pre-charge closing instruction received from the communication bus, generates a pre-charge state signal and sends the generated pre-charge state signal to the vehicle controller.
[0055] In a possible implementation manner, the load controller generates the pre-charge state signal in the following manner:
[0056] The load controller detects the on / off state of the MOS tube and the bus voltage of the vehicle load; when the MOS tube is closed and the bus voltage exceeds a preset threshold, a pre-charging state signal indicating that the pre-charging is successful is generated; when the MOS tube is not closed, and / or the bus voltage does not exceed the preset threshold, a pre-charging state signal indicating that the pre-charging is unsuccessful is generated.
[0057] Here, after the MOS tube is closed, due to the existence of the pre-charging resistor, the battery pack can realize a small current to supply power to the vehicle load through the pre-charging circuit, thereby slowly raising the bus voltage at the load end; after a period of time, when the bus voltage at the load end rises to a certain level, the main contactor is closed again, which can avoid the short circuit of the capacitor in the load and protect the load components from the impact of instantaneous large current.
[0058] S303: When the pre-charging status signal indicates that the pre-charging is successful, the vehicle controller drives the main contactor to close.
[0059] In this step, when the pre-charging status signal indicates that the pre-charging is successful, the vehicle controller can drive the main contactor to close; on the other hand, when the pre-charging status signal indicates that the pre-charging is successful, the vehicle controller does not act and keeps the main contactor open.
[0060] S304: After a predetermined period of time, the vehicle controller sends a pre-charge disconnection instruction to the load controller.
[0061] In this step, after the main contactor is closed, the battery pack supplies power to the vehicle load through the main contactor. Since there is a pre-charging resistor in the pre-charging circuit, the current no longer flows through the pre-charging circuit. Therefore, after the main contactor is closed for a period of time, the pre-charging contactor can be disconnected and the pre-charging circuit no longer works.
[0062] S305: The load controller controls the MOS tube to disconnect in response to the pre-charge disconnection instruction.
[0063] On the other hand, the pre-charge controller in the embodiment of the present application can also be a vehicle controller, that is, the vehicle controller is connected to the gate through the pre-charge control circuit. At this time, when the pre-charge function is realized, the vehicle controller can generate a pre-charge closing instruction to directly control the MOS tube to close; by detecting the on-off state of the MOS tube and the bus voltage of the vehicle load, the vehicle controller generates a pre-charge state signal, and then when the pre-charge state signal indicates that the pre-charge is successful, the vehicle controller drives the main contactor to close; and after a predetermined period of time, the vehicle controller generates a pre-charge disconnection instruction to directly control the MOS tube to disconnect.
[0064] A control method for a pre-charging circuit provided in an embodiment of the present application is applicable to the aforementioned electronic pre-charging circuit. The pre-charging protection function can be realized through communication between the vehicle controller and the load controller to protect load components from damage caused by large current shock at the moment of power-on.
[0065] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 4 As shown in , the electronic device 400 includes a processor 410 , a memory 420 and a bus 430 .
[0066] The memory 420 stores machine-readable instructions executable by the processor 410. When the electronic device 400 is running, the processor 410 communicates with the memory 420 via the bus 430. When the machine-readable instructions are executed by the processor 410, the above-mentioned Figure 3 The steps of the control method of the pre-charging circuit in the method embodiment shown and the specific implementation manner can be found in the method embodiment, which will not be repeated here.
[0067] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figure 3 The steps of the control method of the pre-charging circuit in the method embodiment shown and the specific implementation manner can be found in the method embodiment, which will not be repeated here.
[0068] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.
[0069] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods 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, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.
[0070] 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.
[0071] 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.
[0072] If the functions are implemented in the form of software functional units and sold or used as independent products, they 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 can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for 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: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.
[0073] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A pre-charging circuit for a vehicle battery, characterized in that: The pre-charging circuit comprises: a pre-charging control circuit, a MOS tube and a carbon film pre-charging resistor; One end of the pre-charge control circuit is connected to the pre-charge controller, and the other end of the pre-charge control circuit is connected to the gate of the MOS tube; the drain of the MOS tube is connected to the first contact in the main contactor as one end of the pre-charge circuit; the source of the MOS tube is connected to one end of the carbon film pre-charge resistor, and the other end of the carbon film pre-charge resistor is connected to the second contact in the main contactor as the other end of the pre-charge circuit; One end of the coil in the main contactor is connected to the vehicle controller, and the other end of the coil is grounded; the first contact is also connected to the positive pole of the battery pack, the second contact is also connected to the input end of the vehicle load, and the output end of the vehicle load is connected to the negative pole of the battery pack.
2. precharge circuit according to claim 1, characterized in that, The pre-charge control circuit includes a gate resistor, a diode and a gate capacitor; The pre-charge controller is connected to one end of the gate resistor, and the other end of the gate resistor is connected to the gate of the MOS tube; the other end of the gate resistor is also connected to one end of the gate capacitor, and the other end of the gate capacitor is grounded; the pre-charge controller is also connected to one end of the diode, and the other end of the diode is grounded.
3. precharge circuit according to claim 1, is characterized in that, The pre-charging controller is a vehicle controller or a load controller.
4. precharge circuit according to claim 3, it is characterized in that, The pre-charging circuit is integrated in the load controller.
5. precharge circuit according to claim 1, characterized in that, The MOS tube is an NMOS tube, and the NMOS tube adopts a D2PAK patch package.
6. precharge circuit according to claim 1, characterized in that, The carbon film pre-charging resistor is two parallel plug-in resistors; the carbon film pre-charging resistor adopts a plug-in package.
7. A control method for a pre-charging circuit, characterized in that: The control method is used to control the pre-charging circuit according to any one of claims 1 to 6; the control method comprises: When the pre-charge controller is a load controller, the vehicle controller sends a pre-charge closing instruction to the load controller in response to a vehicle power-on signal; The load controller controls the MOS tube to close in response to the pre-charge closing instruction, generates a pre-charge state signal and sends it to the vehicle controller; When the pre-charging state signal indicates that the pre-charging is successful, the vehicle controller drives the main contactor to close; After a predetermined time has passed, the vehicle controller sends a pre-charge disconnection instruction to the load controller; The load controller controls the MOS tube to be disconnected in response to the pre-charge disconnection instruction.
8. The control method according to claim 7, characterized in that: The load controller generates the pre-charge state signal in the following manner: The load controller detects the on / off state of the MOS tube and the bus voltage of the vehicle load; When the MOS tube is closed and the bus voltage exceeds a preset threshold, a pre-charging state signal indicating that the pre-charging is successful is generated.
9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method of the pre-charging circuit as described in claim 7 or 8.
10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method of the pre-charging circuit according to claim 7 or 8 are executed.