Power supply circuit, power supply having the same, vehicle, control method, and storage medium

Abstract

The present disclosure provides a power supply circuit, a power supply, a vehicle, a control method and a storage medium, the power supply circuit comprising an energy storage capacitor, a switch assembly and a power battery pack assembly; wherein when the vehicle is powered off, the second end of the switch assembly and the second end of the power battery pack assembly are in an attracted state, and the third end of the switch assembly and the first end of the vehicle controller are in a disconnected state; and when the vehicle is powered on, the second end of the switch assembly and the second end of the power battery pack assembly are in a disconnected state, and the third end of the switch assembly and the first end of the vehicle controller are in an attracted state. The power supply circuit of the present disclosure can effectively avoid the battery depletion caused by the long-term parking of the vehicle, and at the same time, the adverse phenomenon of the sulfurization reaction of the battery does not occur, ensuring the safety in use.

Description

Technical Field

[0001] This disclosure generally relates to the field of electronic and electrical technology, and specifically to a power supply circuit and a power source, vehicle, control method, and storage medium having the same. Background Technology

[0002] Electric vehicles consist of a high-voltage power battery and a low-voltage storage battery. During normal operation, the power battery charges the storage battery via a DC-DC converter (DCDC), while the storage battery supplies power to the vehicle's low-voltage electrical system. Even after the power battery is disconnected, the storage battery still needs to supply power to electrical appliances, which continuously consumes battery power. Furthermore, with increasing age, the stored and discharged capacity of the storage battery decreases. In addition, prolonged parking due to unforeseen circumstances can lead to severe battery depletion, rendering the vehicle unable to start, significantly impacting user experience and increasing after-sales support costs. Each instance of battery depletion also causes sulfation, reducing the battery's lifespan.

[0003] Currently, related technologies use a timed wake-up network to recharge the battery with the power battery. However, in this method, the battery may already be severely depleted before the timed recharge begins, causing the vehicle to fail to wake up. When the timed recharge time arrives, the recharge cannot be completed. Furthermore, real-time monitoring consumes battery power, and abnormally high currents will continue to consume power, severely shortening the driving range. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the related technology, it is desirable to provide a power supply circuit, a power source, a vehicle, a control method and a storage medium having the same, which can avoid battery depletion and battery sulfation caused by the vehicle being parked for a long time.

[0005] In a first aspect, this disclosure provides a power supply circuit, which includes an energy storage capacitor, a switching assembly, and a power battery pack assembly.

[0006] The first end of the energy storage capacitor is connected to the first end of the power battery pack assembly, the second end of the energy storage capacitor is connected to the first end of the switch assembly, the second end of the switch assembly can be magnetically connected to the second end of the power battery pack assembly, the third end of the switch assembly can be magnetically connected to the first end of the vehicle controller, and the second end of the vehicle controller is connected to the second end of the power battery pack assembly.

[0007] The switching assembly is configured such that when the vehicle is powered off, the second end of the switching assembly and the second end of the power battery pack assembly are in a engaged state, and the third end of the switching assembly and the first end of the vehicle controller are in a disengaged state; and when the vehicle is powered on, the second end of the switching assembly and the second end of the power battery pack assembly are in a disengaged state, and the third end of the switching assembly and the first end of the vehicle controller are in a engaged state.

[0008] Optionally, in some embodiments of this disclosure, the power battery pack assembly includes a power battery pack, an intermediate relay, and a DC-DC converter;

[0009] The first end of the DC-DC converter is connected to the first end of the energy storage capacitor, the second end of the DC-DC converter is connected to the second end of the switching assembly, the third end of the DC-DC converter is connected to the first end of the intermediate relay, the fourth end of the DC-DC converter is connected to the second end of the intermediate relay, and the third end of the intermediate relay is connected to the power battery pack.

[0010] Optionally, in some embodiments of this disclosure, the intermediate relay includes a main positive relay, a main negative relay, and a DC relay;

[0011] The first terminal of the DC relay is connected to the third terminal of the DC converter, the second terminal of the DC relay is connected to the positive terminal of the power battery pack, the first terminal of the main positive relay is connected to the positive terminal of the power battery pack, the second terminal of the main positive relay is connected to the first terminal of the high-voltage accessory, the low-voltage auxiliary contact of the main positive relay is connected to the second terminal of the DC converter, the first terminal of the main negative relay is connected to the fourth terminal of the DC converter and the second terminal of the high-voltage accessory, the second terminal of the main negative relay is connected to the negative terminal of the power battery pack, and the low-voltage auxiliary contact of the main negative relay is connected to the second terminal of the DC converter.

[0012] Optionally, in some embodiments of this disclosure, the power battery pack assembly further includes a pre-charge resistor and a pre-charge relay;

[0013] The first end of the pre-charge resistor is connected to the positive terminal of the power battery pack, the second end of the pre-charge resistor is connected to the first end of the pre-charge relay, and the second end of the pre-charge relay is connected to the second end of the main positive relay.

[0014] Optionally, in some embodiments of this disclosure, the switching assembly includes a single-pole double-opening relay.

[0015] In a second aspect, this disclosure provides a power supply, the power supply including a battery pack management system and a power supply circuit as described in any one of the first aspects; the battery pack management system is connected to a switching component in the power supply circuit and configured to control the opening and closing of the port of the switching component.

[0016] Thirdly, this disclosure provides a vehicle, the vehicle including a vehicle controller and the power supply described in the second aspect.

[0017] Optionally, in some embodiments of this disclosure, the vehicle further includes a key antenna controller; the key antenna controller is connected to the battery pack management system in the power supply, configured to control the power supply of the key antenna, and send a vehicle power-on request to the battery pack management system when an unlock signal of the vehicle is detected.

[0018] Fourthly, this disclosure provides a control method for a power supply circuit according to any one of the first aspects, the method comprising:

[0019] Obtain the vehicle's operating status;

[0020] When the operating state is power-off, the second end of the control switch assembly and the second end of the power battery pack assembly are engaged, and the third end of the control switch assembly and the first end of the vehicle controller are disconnected.

[0021] When the operating state is powered on, the second terminal of the control switch assembly is disconnected from the second terminal of the power battery pack assembly, and the third terminal of the control switch assembly is engaged with the first terminal of the vehicle controller.

[0022] Fifthly, this disclosure provides a computer-readable storage medium storing one or more programs that can be executed by one or more processors to implement the steps of the control method described in the fourth aspect.

[0023] As can be seen from the above technical solutions, the embodiments disclosed herein have the following advantages:

[0024] This disclosure provides a power supply circuit and a power source, vehicle, control method, and storage medium having the same. It replaces the battery with a combination of an energy storage capacitor and a switching assembly. When the vehicle is powered off, the second terminal of the switching assembly is engaged with the second terminal of the power battery pack assembly, while the third terminal of the switching assembly is disconnected from the first terminal of the vehicle controller. In this case, the power battery pack assembly ensures that voltage is always present across the energy storage capacitor, without needing to supply power to the vehicle controller. Conversely, when the vehicle is powered on, the second terminal of the switching assembly is disconnected from the second terminal of the power battery pack assembly, while the third terminal of the switching assembly is engaged with the first terminal of the vehicle controller. In this case, the energy storage capacitor can trigger the power battery pack assembly to start, supplying power to the vehicle controller. Therefore, it effectively avoids battery depletion caused by prolonged vehicle parking and prevents battery sulfation, ensuring safe operation. Attached Figure Description

[0025] Other features, objects, and advantages of this disclosure will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 A structural block diagram of a power supply circuit provided in an embodiment of this disclosure;

[0027] Figure 2 This is a structural block diagram of another power supply circuit provided in an embodiment of the present disclosure;

[0028] Figure 3 A specific example of a power supply circuit provided in an embodiment of this disclosure;

[0029] Figure 4 A structural block diagram of a power supply provided in an embodiment of this disclosure;

[0030] Figure 5 A structural block diagram of a vehicle provided in an embodiment of this disclosure;

[0031] Figure 6 A structural block diagram of another vehicle provided in this disclosure embodiment;

[0032] Figure 7 This is a flowchart illustrating a control method for a power supply circuit provided in an embodiment of the present disclosure.

[0033] Figure label:

[0034] 100-Power supply circuit, 101-Energy storage capacitor, 102-Switch assembly, 103-Power battery pack assembly, 1031-Power battery pack, 1032-Intermediate relay, 1033-DC converter, 1034-Main positive relay, 1035-Main negative relay, 1036-DC relay, 1037-Pre-charge resistor, 1038-Pre-charge relay, 104-Vehicle controller, 200-Power supply, 201-Battery pack management system, 300-Vehicle, 301-Key antenna controller. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present disclosure, the technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present disclosure.

[0036] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in this disclosure, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described can be implemented in orders other than those illustrated or described herein.

[0037] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to such process, method, product, or device.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. The following is an explanation... Figures 1 to 7 The present disclosure provides a detailed description of the power supply circuit, power source, vehicle, control method, and storage medium provided in the embodiments thereof.

[0039] Please refer to Figure 1This is a structural block diagram of a power supply circuit provided in an embodiment of the present disclosure. The power supply circuit 100 includes an energy storage capacitor 101, a switching assembly 102, and a power battery pack assembly 103. The first end of the energy storage capacitor 101 is connected to the first end of the power battery pack assembly 103, the second end of the energy storage capacitor 101 is connected to the first end of the switching assembly 102, and the second end of the switching assembly 102 can be magnetically connected to the second end of the power battery pack assembly 103. The third end of the switching assembly 102 can be magnetically connected to the first end of a vehicle controller 104, and the second end of the vehicle controller 104 is connected to the second end of the power battery pack assembly 103. For example, the switching assembly 102 includes, but is not limited to, a single-pole double-opening relay.

[0040] In actual use, for example, when the vehicle is powered off, the second terminal of the switch assembly 102 and the second terminal of the power battery pack assembly 103 are in a energized state, while the third terminal of the switch assembly 102 and the first terminal of the vehicle controller 104 are in a de-energized state. At this time, the power battery pack assembly 103 ensures that voltage is always present across the energy storage capacitor 101, and there is no need to supply power to the vehicle controller 104. Conversely, when the vehicle is powered on, the second terminal of the switch assembly 102 and the second terminal of the power battery pack assembly 103 are in a de-energized state, while the third terminal of the switch assembly 102 and the first terminal of the vehicle controller 104 are in a energized state. At this time, the energy storage capacitor 101 can trigger the power battery pack assembly 103 to start, supplying power to the vehicle controller 104. The advantage of this configuration is that the combination of the energy storage capacitor 101 and the switch assembly 102 can replace the battery, effectively preventing battery depletion caused by prolonged vehicle parking, and avoiding the adverse phenomenon of battery sulfation, thus ensuring safe use.

[0041] Optionally, such as Figure 2 As shown, in some embodiments of this disclosure, the power battery pack assembly 103 may include a power battery pack 1031, an intermediate relay 1032, and a DC-DC converter (DCDC) 1033. A first terminal of the DC-DC converter 1033 (corresponding to the first terminal of the power battery pack assembly 103) is connected to the first terminal of the energy storage capacitor 101. A second terminal of the DC-DC converter 1033 (corresponding to the second terminal of the power battery pack assembly 103) can be energized and connected to the second terminal of the switch assembly 102. A third terminal of the DC-DC converter 1033 is connected to the first terminal of the intermediate relay 1032, and a fourth terminal of the DC-DC converter 1033 is connected to the second terminal of the intermediate relay 1032. The third terminal of the intermediate relay 1032 is connected to the power battery pack 1031. For example, the power battery pack 1031 may include, but is not limited to, at least one battery module. When the power battery pack 1031 includes two or more battery modules, these battery modules are connected in series.

[0042] For example, such as Figure 3As shown, in some embodiments of this disclosure, the intermediate relay 1032 may include a main positive relay 1034, a main negative relay 1035, and a DC relay 1036. The first terminal of the DC relay 1036 is connected to the third terminal of the DC-DC converter 1033, and the second terminal of the DC relay 1036 is connected to the positive terminal of the power battery pack 1031. The first terminal of the main positive relay 1034 is connected to the positive terminal of the power battery pack 1031, and the second terminal of the main positive relay 1034 is connected to the first terminal of the high-voltage accessory. The low-voltage auxiliary contact of the main positive relay 1034 is connected to the second terminal of the DC-DC converter 1033. The first terminal of the main negative relay 1035 is connected to both the fourth terminal of the DC-DC converter 1033 and the second terminal of the high-voltage accessory. The second terminal of the main negative relay 1035 is connected to the negative terminal of the power battery pack 1031, and the low-voltage auxiliary contact of the main negative relay 1035 is connected to the second terminal of the DC-DC converter 1033.

[0043] Alternatively, still using Figure 3 As shown in the example, in some embodiments of this disclosure, the power battery pack assembly 103 may further include a pre-charge resistor 1037 and a pre-charge relay 1038. The advantage of this arrangement is to protect the circuit and prevent damage to the devices due to sudden excessive current. Specifically, the first terminal of the pre-charge resistor 1037 is connected to the positive terminal of the power battery pack 1031, the second terminal of the pre-charge resistor 1037 is connected to the first terminal of the pre-charge relay 1038, and the second terminal of the pre-charge relay 1038 is connected to the second terminal of the main positive relay 1034.

[0044] To facilitate a better understanding of the embodiments disclosed herein, the following are now combined with Figure 3 The specific example shown will be explained in detail. When the vehicle is powered off, Figure 3 When pins ① and ② are engaged, the main negative relay 1035 and the DC relay 1036 are also engaged, forming a high-voltage to low-voltage circuit. This ensures that there is always voltage across the energy storage capacitor 101 without needing to supply power to the vehicle controller 104. At this time, the low-voltage auxiliary contact of the main positive relay 1034 supplies 12V voltage through pin ②. When the vehicle needs to be powered on, the battery pack management system 201 controls the switching components 102, such as single-pole double-opening relays, to open at pins ① and ②, and pins ① and ③ to engage. In this way, the DC-DC converter 1033 can supply power to the vehicle controller 104 through pins ② and ③. When the battery pack management system 201 controls the port of the control switch assembly 102 to close, it also controls the port of the precharge relay 1038 to close, and then disconnects the precharge relay 1038 after, for example, 3 seconds, and closes the port of the main positive relay 1034. Thus, the power battery pack 1031 can supply power to the high-voltage part of the vehicle through the main positive relay 1034 and the main negative relay 1035, that is, the whole vehicle is powered on and the user can use the vehicle normally.

[0045] It should be noted that in this embodiment, when the vehicle is powered off, pin ② is first disconnected to supply 12V voltage to the low-voltage auxiliary contact of the main positive relay 1034. Then, the battery pack management system 201 controls the main positive relay 1034 to disconnect, and then controls the switching assembly 102 to disconnect pins ① and ③, and pins ① and ② to engage. In this way, only the battery pack management system 201 and the DC-DC converter 1033 in the whole vehicle need low-voltage power, which can be obtained by the power battery pack 1031 and the DC-DC converter 1033. The power consumption is less than 2mA, and there is no need to supply power to the vehicle controller 104, so no current is consumed.

[0046] Since only low-voltage electricity needs to be supplied to the low-voltage auxiliary contacts of the main positive relay 1034 and the auxiliary contacts of the pre-charge relay 1038 (not shown in the figure) when the vehicle is powered on, no current needs to be supplied. Assuming the voltage of the energy storage capacitor 101 is 12V and its capacitance is 2000F, then the stored energy W of the energy storage capacitor 101 is 0.5CU. 2 =0.5*2000*12 2 =144000J, equivalent to a battery capacity I = W / Ut = 144000 / (3600*12) = 3.3A, which is equivalent to a small storage battery with a discharge current of 3.3A per hour. This capacity is sufficient to power the auxiliary contacts of the relay. In addition, when the power battery pack 1031 needs to be charged, since the energy storage capacitor 101 supplies power to the low-voltage auxiliary contacts, the battery pack management system 201 closes the main positive relay 1034 to complete the charging.

[0047] This disclosure provides a power supply circuit that replaces the battery with a combination of an energy storage capacitor and a switching assembly. When the vehicle is powered off, the second terminal of the switching assembly is engaged with the second terminal of the power battery pack assembly, while the third terminal of the switching assembly is disconnected from the first terminal of the vehicle controller. In this case, the power battery pack assembly can ensure that there is always voltage across the energy storage capacitor without supplying power to the vehicle controller. When the vehicle is powered on, the second terminal of the switching assembly is disconnected from the second terminal of the power battery pack assembly, while the third terminal of the switching assembly is engaged with the first terminal of the vehicle controller. In this case, the energy storage capacitor can trigger the power battery pack assembly to start and supply power to the vehicle controller. Therefore, this effectively avoids battery depletion caused by prolonged vehicle parking and prevents the adverse phenomenon of battery sulfation, ensuring safe use.

[0048] Based on the foregoing embodiments, this disclosure provides a power supply. Please refer to... Figure 4 The power supply 200 may include a battery management system (BMS) 201 and Figures 1-3The power supply circuit 100 corresponds to this embodiment. The battery pack management system 201 is connected to the switching component 102 in the power supply circuit 100, and can control the opening and closing of the ports of the switching component 102. Additionally, in some embodiments of this disclosure, the battery pack management system 201 can also control the opening and closing of the ports of each relay in the power supply circuit 100.

[0049] This disclosure provides a power supply in which the power supply circuit replaces the battery with a combination of energy storage capacitor and switching components, thereby effectively avoiding battery depletion caused by long-term vehicle parking, and preventing the adverse phenomenon of battery sulfation reaction, thus ensuring safe use.

[0050] Based on the foregoing embodiments, this disclosure provides a vehicle. Please refer to... Figure 5 The vehicle 300 may include a vehicle controller 104 and Figure 4 The power supply 200 in the corresponding embodiment.

[0051] Optionally, such as Figure 6 As shown, in some embodiments of this disclosure, the vehicle 300 may also include a key antenna controller 301, which is connected to the battery pack management system 201 in the power supply 200. The key antenna controller 301 can control the power supply of the key antenna and send a vehicle power-on request to the battery pack management system 201 when an unlock signal of the vehicle 300 is detected.

[0052] This disclosure provides a vehicle that uses a combination of energy storage capacitors and switching components to replace the battery, thereby effectively avoiding battery depletion caused by prolonged parking and preventing the adverse phenomenon of battery sulfation, thus ensuring safe use.

[0053] Based on the foregoing embodiments, this disclosure provides a method for... Figures 1-3 The control method for the power supply circuit 100 in the corresponding embodiment. Please refer to... Figure 7 This is a flowchart illustrating a control method for a power supply circuit provided in an embodiment of this disclosure. The control method includes the following steps:

[0054] S101, obtain the vehicle's operating status.

[0055] For example, the operating state in this embodiment may include, but is not limited to, power-on and power-off. For instance, power-on corresponds to unlocking the vehicle, and power-off corresponds to turning off the vehicle.

[0056] S102, when the operating state is power-off, the second terminal of the control switch assembly and the second terminal of the power battery pack assembly are engaged, and the third terminal of the switch assembly and the first terminal of the vehicle controller are disconnected.

[0057] For example, with Figure 3 As shown in the example, when the vehicle is powered off, the battery pack management system 201 controls... Figure 3 The pins ① and ② are engaged, while the pins ① and ③ are disengaged.

[0058] S103, when the operating state is powered on, the second terminal of the control switch assembly is disconnected from the second terminal of the power battery pack assembly, and the third terminal of the switch assembly is engaged with the first terminal of the vehicle controller.

[0059] For example, when the vehicle is powered on, the battery pack management system 201 controls... Figure 3 Pins ① and ② are disconnected, while pins ① and ③ are engaged.

[0060] It should be noted that the descriptions of the same steps and contents in this embodiment as in other embodiments can be found in the descriptions in other embodiments, and will not be repeated here.

[0061] This disclosure provides a control method for a power supply circuit. This method replaces the battery with a combination of an energy storage capacitor and a switching assembly. When the vehicle is powered off, the second terminal of the switching assembly is engaged with the second terminal of the power battery pack assembly, while the third terminal of the switching assembly is disconnected from the first terminal of the vehicle controller. In this case, the power battery pack assembly ensures that voltage is always present across the energy storage capacitor, and there is no need to supply power to the vehicle controller. Conversely, when the vehicle is powered on, the second terminal of the switching assembly is disconnected from the second terminal of the power battery pack assembly, while the third terminal of the switching assembly is engaged with the first terminal of the vehicle controller. In this case, the energy storage capacitor can trigger the power battery pack assembly to start, supplying power to the vehicle controller. Therefore, this effectively avoids battery depletion caused by prolonged vehicle parking and prevents adverse phenomena such as battery sulfation, ensuring safe operation.

[0062] In another aspect, embodiments of this disclosure provide a computer-readable storage medium for storing a program for executing the aforementioned... Figure 7 The steps of the control method in the corresponding embodiment.

[0063] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and modules described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0064] In the several embodiments provided in this disclosure, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed between each other can be indirect coupling or communication connection through some interfaces, apparatuses, or modules, and can be electrical, mechanical, or other forms. Modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the embodiments according to actual needs.

[0065] Furthermore, the functional modules in the various embodiments of this disclosure can be integrated into one processing unit, or each module can exist physically separately, or two or more units can be integrated into one module. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0066] Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the control methods of the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and not to limit them; although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes an energy storage capacitor, a switching assembly, and a power battery pack assembly. The first end of the energy storage capacitor is connected to the first end of the power battery pack assembly, the second end of the energy storage capacitor is connected to the first end of the switch assembly, the second end of the switch assembly can be magnetically connected to the second end of the power battery pack assembly, the third end of the switch assembly can be magnetically connected to the first end of the vehicle controller, and the second end of the vehicle controller is connected to the second end of the power battery pack assembly. The switching assembly is configured such that when the vehicle is powered off, the second end of the switching assembly and the second end of the power battery pack assembly are in an engaged state, and the third end of the switching assembly and the first end of the vehicle controller are in an unengaged state. Furthermore, when the vehicle is powered on, the second terminal of the switch assembly and the second terminal of the power battery pack assembly are in an open state, while the third terminal of the switch assembly and the first terminal of the vehicle controller are in an engaged state.

2. The power supply circuit according to claim 1, characterized in that, The power battery pack assembly includes a power battery pack, an intermediate relay, and a DC-DC converter; The first end of the DC-DC converter is connected to the first end of the energy storage capacitor, the second end of the DC-DC converter is connected to the second end of the switching assembly, the third end of the DC-DC converter is connected to the first end of the intermediate relay, the fourth end of the DC-DC converter is connected to the second end of the intermediate relay, and the third end of the intermediate relay is connected to the power battery pack.

3. The power supply circuit according to claim 2, characterized in that, The intermediate relay includes a main positive relay, a main negative relay, and a DC relay; The first terminal of the DC relay is connected to the third terminal of the DC converter, the second terminal of the DC relay is connected to the positive terminal of the power battery pack, the first terminal of the main positive relay is connected to the positive terminal of the power battery pack, the second terminal of the main positive relay is connected to the first terminal of the high-voltage accessory, the low-voltage auxiliary contact of the main positive relay is connected to the second terminal of the DC converter, the first terminal of the main negative relay is connected to the fourth terminal of the DC converter and the second terminal of the high-voltage accessory, the second terminal of the main negative relay is connected to the negative terminal of the power battery pack, and the low-voltage auxiliary contact of the main negative relay is connected to the second terminal of the DC converter.

4. The power supply circuit according to claim 2 or 3, characterized in that, The power battery pack assembly also includes a pre-charge resistor and a pre-charge relay; The first end of the pre-charge resistor is connected to the positive terminal of the power battery pack, the second end of the pre-charge resistor is connected to the first end of the pre-charge relay, and the second end of the pre-charge relay is connected to the second end of the main positive relay.

5. The power supply circuit according to claim 1, characterized in that, The switching assembly includes a single-pole double-opening relay.

6. A power supply, characterized in that, The power source includes a battery pack management system and a power supply circuit as described in any one of claims 1 to 5; the battery pack management system is connected to a switching component in the power supply circuit and is configured to control the opening and closing of the port of the switching component.

7. A vehicle, characterized in that, The vehicle includes a vehicle controller and the power supply as described in claim 6.

8. The vehicle according to claim 7, characterized in that, The vehicle also includes a key antenna controller; the key antenna controller is connected to the battery pack management system in the power supply, and is configured to control the power supply of the key antenna, and send a vehicle power-on request to the battery pack management system when the vehicle unlock signal is detected.

9. A control method for a power supply circuit according to any one of claims 1 to 5, characterized in that, The method includes: Obtain the vehicle's operating status; When the operating state is power-off, the second end of the control switch assembly and the second end of the power battery pack assembly are engaged, and the third end of the control switch assembly and the first end of the vehicle controller are disconnected. When the operating state is powered on, the second terminal of the control switch assembly is disconnected from the second terminal of the power battery pack assembly, and the third terminal of the control switch assembly is engaged with the first terminal of the vehicle controller.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the control method of claim 9.

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