CN221698650U - Low-voltage power supply circuit for vehicle - Google Patents

Abstract

The utility model provides a vehicle low-voltage power supply circuit. The vehicle low-voltage power supply circuit includes: a low-voltage power supply controller, which has a wake-up interface and a power control interface; a mechanical switch, which is used to be set on the outside of the vehicle body and electrically connected to the wake-up interface; a relay, which is used to be set on the line connecting the vehicle's low-voltage power supply to the vehicle's low-voltage power load, and the control end of the relay is connected to the power control interface; the low-voltage power supply controller is also provided with a logic module, and the logic module is respectively connected to the wake-up interface and the power control interface, and after determining that the trigger signal of the mechanical switch is a preset restart signal, a reset signal for driving the relay is sent through the power control interface, so that the relay completes the reset. The solution of the utility model realizes the restart of the vehicle's low-voltage power load by triggering the mechanical switch to control the relay to reset, without actively disconnecting and reconnecting the power supply, reducing the difficulty of restarting the low-voltage power load.

Description

Vehicle low voltage power supply circuit

Technical Field

The utility model relates to the technical field of vehicle circuits, in particular to a vehicle low-voltage power supply circuit.

Background Art

Current technical status: When the low-voltage electrical loads of a vehicle need to be RESET (restarted), it is necessary to mechanically open the front hood or rear hood of the vehicle, disconnect the low-voltage power supply and then reconnect it, so as to restore the power supply after the low-voltage power supply is cut off and restart the low-voltage electrical loads of the vehicle. However, this method requires professional rescue or maintenance personnel to operate, and is time-consuming, which brings many disadvantages to users.

Utility Model Content

One purpose of the utility model is to reduce the difficulty of restarting a low-voltage electrical load of a vehicle.

A further object of the utility model is to actively control the restart of the low-voltage electrical load of the vehicle through a switch.

In particular, the utility model provides a vehicle low-voltage power supply circuit, comprising:

A low voltage power controller having a wake-up interface and a power control interface;

A mechanical switch, which is arranged on the outside of the vehicle body and is electrically connected to the wake-up interface;

A relay is used to be arranged on a line connecting a low-voltage power supply of a vehicle to a low-voltage electrical load of the vehicle, and a control end of the relay is connected to a power supply control interface;

The low-voltage power supply controller is also provided with a logic module, and the logic module is respectively connected to the wake-up interface and the power control interface. After determining that the trigger signal of the mechanical switch is a preset restart signal, a reset signal for driving the relay is sent through the power control interface, so that the relay completes the reset.

Optionally, the mechanical switch is a door cover switch of the vehicle, and is configured to convert different trigger operations into trigger signals with different durations, which serve as restart signals or door cover operation signals respectively.

Optionally, the mechanical switch is also electrically connected to the vehicle low-voltage electrical load and is configured to be operatively grounded, thereby using the ground signal as a trigger signal.

Optionally, the contacts of the relay are arranged on the line between the low-voltage power supply controller and the low-voltage electrical load of the vehicle, and are configured to be in a normally closed state.

Optionally, the vehicle low-voltage power supply circuit further includes:

Current sensors, used to monitor current in low voltage power supply circuits;

The low voltage power supply controller has a current monitoring interface, and the current sensor is connected to the current monitoring interface for outputting a current monitoring signal to the low voltage power supply controller.

Optionally, the low-voltage power supply controller has a communication interface, and the communication interface is connected to the vehicle's low-voltage electrical load, and is used for signal transmission between the vehicle's low-voltage electrical load and the low-voltage power supply controller.

Optionally, the low voltage power supply is set to a 12V lithium battery;

The vehicle's low-voltage electrical loads include the vehicle's electronic control unit.

Optionally, the mechanical switch includes at least one or more of the following switches: a vehicle door handle switch, a charging port cover switch, and a trunk switch.

Optionally, the low-voltage power supply controller has a voltage monitoring interface, and the voltage monitoring interface is connected to the low-voltage power supply for monitoring the low-voltage power supply.

In another aspect of the present invention, a vehicle is provided, comprising:

A vehicle low voltage power supply circuit according to any one of the above items.

The low-voltage power supply circuit of the vehicle of the present invention includes a low-voltage power supply controller, which has a wake-up interface and a power control interface; it also includes a mechanical switch, which is used to be set on the outside of the vehicle body and electrically connected to the wake-up interface; it also includes a relay, which is used to be set on the line where the low-voltage power supply of the vehicle is connected to the low-voltage power load of the vehicle, and the control end of the relay is connected to the power control interface; and the low-voltage power supply controller is also provided with a logic module, the logic module is respectively connected to the wake-up interface and the power control interface, and after determining that the trigger signal of the mechanical switch is a preset restart signal, a reset signal for driving the relay is sent through the power control interface, so that the relay completes the reset. The scheme of the present utility model sends a restart signal to the low-voltage power supply controller through a mechanical switch, and the low-voltage power supply controller sends a reset signal to the relay after receiving the restart signal. The relay performs a reset operation after receiving the reset signal, thereby realizing the restart of the low-voltage power load of the vehicle in the vehicle, without actively disconnecting and reconnecting the power supply, reducing the difficulty of restarting the low-voltage power load of the vehicle.

Furthermore, the vehicle low-voltage power supply circuit of the utility model reuses the mechanical switch on the outside of the vehicle body, thereby performing corresponding operations according to the different types of signals sent by the mechanical switch, without the need to add a new mechanical switch, thereby improving the applicability of the vehicle low-voltage power supply circuit.

Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG1 is a schematic diagram of a low-voltage power supply circuit structure of a vehicle according to an embodiment of the present utility model;

FIG2 is a schematic diagram of a vehicle low-voltage power supply circuit module according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a vehicle according to an embodiment of the present utility model.

DETAILED DESCRIPTION

It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention, and the embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Furthermore, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

Fig. 1 is a schematic diagram of the structure of a vehicle low-voltage power supply circuit according to an embodiment of the utility model. In some optional embodiments, the vehicle low-voltage power supply circuit generally may include: a low-voltage power supply controller 10, a mechanical switch 20, a relay 30, a low-voltage power load 40, a current sensor 50, and a low-voltage power supply 60 and other devices.

The low voltage power supply controller 10 is used to manage the low voltage power supply circuit of the vehicle. An optional example of the low voltage power supply controller 10 is a BMS (Battery Management System), which is mainly used to monitor, calculate and protect the low voltage power supply circuit of the vehicle. The low voltage power supply controller 10 is generally provided with a wake-up interface 102 and a power control interface 103.

The mechanical switch 20 can generally be set on the outside of the vehicle body and electrically connected to the wake-up interface 102; the relay 30 can generally be set on the line connecting the vehicle's low-voltage power supply 60 to the vehicle's low-voltage power load 40, and the control end of the relay 30 is connected to the power control interface 103.

In this embodiment, a logic module 101 is provided in the low-voltage power supply controller 10, and the logic module 101 is connected to the wake-up interface 102 and the power control interface 103 respectively. The low-voltage power supply controller 10 receives a trigger signal from the mechanical switch 20 through the wake-up interface 102. When the logic module 101 determines that the trigger signal is a restart signal, it controls the power control interface 103 to send a reset signal to drive the relay 30, so that the relay 30 completes the reset. Among them, an optional setting logic of the internal logic of the logic module 101 is as follows: when the mechanical switch 20 is long pressed, the mechanical switch 20 is closed, so that the trigger signal is sent to the low-voltage power supply controller 10 through the wake-up interface 102; when the duration of the trigger signal is greater than the duration set in the low-voltage power supply controller 10, the low-voltage power supply controller 10 sends a reset signal to the relay 30 through the power control interface 103, and the relay 30 resets after receiving the reset signal, so as to realize the restart of the low-voltage electrical load 40 of the vehicle. The relay 30 can be configured to detect whether the contacts of the relay 30 are in a closed state after receiving the reset signal. If so, the contacts are disconnected and then closed again; if the contacts are already in an open state, they are directly closed. The vehicle low-voltage power supply circuit is restarted through this reset operation. The above-mentioned logic module 101 is implemented by a hardware circuit, and the detection of the trigger signal can be realized by a logic device such as a trigger.

In some optional embodiments, the mechanical switch 20 is a door cover switch of the vehicle, and the door cover switch of the vehicle can be configured to close the mechanical switch 20 when the door cover switch is triggered, thereby connecting the circuit with the low-voltage power supply controller 10 to achieve signal transmission. The door cover switch refers to a switch on the outside of the vehicle that controls the door or cover on the vehicle body, such as a vehicle door handle switch, a charging port cover switch, and a trunk switch.

In other optional embodiments, the mechanical switch 20 may also include a soft switch. When the mechanical switch 20 is a switch of the type of vehicle door handle switch, charging port cover switch, and trunk switch, such a switch can be set in the corresponding low-voltage power load 40; if it is a soft switch, the logic module 101 inside the soft switch needs to be set in the low-voltage power supply controller 10, so that the soft switch is independent of the vehicle low-voltage power load 40, so that when the vehicle low-voltage power load 40 needs to be restarted, it can be controlled to restart through the soft switch. Those skilled in the art can determine the specific mechanical switch connected to the vehicle low-voltage power supply circuit of this solution according to actual conditions.

In this embodiment, the mechanical switch 20 is also electrically connected to the vehicle low-voltage electrical load 40, and is configured to be grounded by operation, so that the grounding signal is used as a trigger signal. By grounding the mechanical switch 20, when the mechanical switch 20 is triggered and closed, the mechanical switch 20 is connected to the circuit of the low-voltage power supply controller 10. At this time, since the mechanical switch 20 is in a grounded state, the circuit of the mechanical switch 20 and the low-voltage power supply controller 10 will become a low level. When the duration of the low level reaches a preset duration, that is, the low-voltage power supply controller 10 receives a restart signal, it will then trigger the operation of sending a reset signal to the relay 30.

In this embodiment, the contacts of the relay 30 are arranged on the line between the low-voltage power supply controller 10 and the low-voltage electrical load 40 of the vehicle, and are configured to be normally closed. Since the vehicle usually needs to ensure the normal operation of the low-voltage electrical load 40, it is necessary to keep the line reliably connected. The contacts of the relay 30 are arranged on the line between the low-voltage power supply controller 10 and the low-voltage electrical load 40 of the vehicle, so as to ensure that the low-voltage power supply controller 10 can send a reset signal to the relay 30 after receiving the restart signal from the mechanical switch 20. The relay 30 receives the reset signal and controls the switch of the contacts to realize the on-off of the low-voltage power supply circuit of the vehicle, thereby realizing the restart of the low-voltage electrical load 40 of the vehicle.

In some optional embodiments, the vehicle low-voltage power supply circuit also includes a current sensor 50 for monitoring the current in the low-voltage power supply circuit; the low-voltage power supply controller 10 is provided with a current monitoring interface 105, and the current sensor 50 is connected to the current monitoring interface 105, for outputting a current monitoring signal to the low-voltage power supply controller 10. Among them, an optional example of the current sensor 50 is: Shunt (shunt resistor). Through such a current sensor 50, the current size in the vehicle low-voltage power supply circuit can be monitored in real time, and the signal of the current size is sent to the low-voltage power supply controller 10 through the current monitoring interface 105, thereby effectively controlling the current size in the vehicle low-voltage power supply circuit.

In this embodiment, the low-voltage power supply controller 10 also has a communication interface 104, and the communication interface 104 is connected to the vehicle low-voltage electrical load 40, and is used for signal transmission between the vehicle low-voltage electrical load 40 and the low-voltage power supply controller 10. During operation, the vehicle low-voltage electrical load 40 sends a signal to the low-voltage power supply controller 10 through the communication interface 104, thereby realizing communication between the vehicle low-voltage electrical load 40 and the low-voltage power supply controller 10. The communication interface 104 can be a CAN bus, wherein the CAN bus can generally include CAN-H and CAN-L, and the signal transmission between the low-voltage power supply controller 10 in the vehicle and the vehicle low-voltage electrical load 40 can be realized through CAN-H and CAN-L.

In this embodiment, the low voltage power supply can generally be set to a 12V lithium battery, wherein the 12V lithium battery is an ideal battery due to its characteristics, has good stability and reliability, and is very suitable as a power supply for small devices. Those skilled in the art can select a suitable low voltage power supply according to actual circuit requirements.

In this embodiment, the vehicle low-voltage electrical load 40 may generally include an automotive electronic control unit (Electronic Control Unit, ECU for short). The ECU is generally capable of controlling all other driver chips in the vehicle and managing all storage devices, so that each function is executed in an orderly manner. Therefore, when the relay 30 receives the reset signal, the vehicle low-voltage power supply circuit is disconnected, so that the ECU can be powered off under the control of the relay 30, and then the relay 30 closes the contact to restore the vehicle low-voltage power supply circuit, and the ECU will start synchronously, thereby realizing the restart of the ECU.

In some other optional embodiments, the low-voltage power supply controller 10 may be provided with a voltage monitoring interface 106 , and the voltage monitoring interface 106 is connected to the low-voltage power supply 60 for monitoring the low-voltage power supply 60 .

In this embodiment, the specific implementation process of this circuit includes: when the user only wants to open the door or trunk door of the vehicle outside the vehicle, short press the corresponding mechanical switch 20, then the mechanical switch 20 is closed, and the low-voltage power supply controller 10 detects that the level has become a low level through the wake-up interface 102. Then, when the user releases the mechanical switch 20, the mechanical switch 20 is disconnected, and the low-voltage power supply controller 10 detects that the level has been restored. During this period, since the duration of the level change does not reach the preset duration, the door cover corresponding to the mechanical switch 20 is opened.

When the vehicle needs to restart the low-voltage electrical load 40 in the vehicle due to a fault or the like in the low-voltage electrical load 40, a mechanical switch 20 with a restart function is selected, that is, a mechanical switch 20 of the vehicle low-voltage power supply circuit connected to the present embodiment, such as a trunk switch, and then a long press is performed in front of the corresponding mechanical switch 20. At this time, the mechanical switch 20 is closed, and the low-voltage power supply controller 10 detects that the power level becomes a low level through the wake-up interface 102. When the low level duration reaches a preset time, it indicates that the trigger signal is a restart signal. The low-voltage power supply controller 10 sends a reset signal to the relay 30 through the power control interface 103. After receiving the reset signal, the relay 30 detects whether the contact state of the relay 30 is in a closed state. If so, the contact connection is disconnected and then closed again; if the contact is already in a disconnected state, it is directly closed. The restart of the low-voltage electrical load 40 is achieved through this operation.

This low-voltage power supply circuit can restart the vehicle's low-voltage power load 40 without manual restart. The user only needs to operate a mechanical switch to restart the vehicle's low-voltage power load, without actively performing a restart operation, thereby reducing the difficulty of restarting the vehicle's low-voltage power load. There is also no need to add a corresponding switch to the vehicle body, and only the existing mechanical switch of the vehicle needs to be reused, thereby improving the applicability of the vehicle's low-voltage power supply circuit.

Fig. 2 is a schematic diagram of a vehicle low-voltage power supply circuit module according to an embodiment of the utility model. In some optional embodiments, the vehicle low-voltage power supply circuit module in this schematic diagram may generally include: a low-voltage power supply controller 10, wherein the low-voltage power supply controller 10 is internally provided with a wake-up interface 102, a power control interface 103, a communication interface 104, a current monitoring interface 105, a voltage monitoring interface 106 and a logic module 101.

Among them, the logic module 101 is connected to the internal interface of the low-voltage power supply controller 10, and the execution logic inside the logic module 101 is set so that the low-voltage power supply controller 10 receives a trigger signal from the mechanical switch 20 through the wake-up interface 102, and when the trigger signal is a restart signal, the power supply control interface 103 is controlled to send a reset signal to drive the relay 30, so that the relay 30 completes the reset.

In this embodiment, an optional example of the low-voltage power supply controller 10 is a BMS (Battery Management System), which is mainly used for monitoring, calculating and protecting the low-voltage power supply circuit of the vehicle.

The wake-up interface 102 is usually electrically connected to the mechanical switch 20, and is responsible for receiving the trigger signal input from the mechanical switch 20. The mechanical switch 20 is also electrically connected to the vehicle low-voltage electrical load 40, and is configured to be grounded by operation, so that the ground signal is used as a trigger signal. In this embodiment, when the mechanical switch 20 is triggered and closed, the mechanical switch 20 is connected to the circuit of the low-voltage power supply controller 10, and the wake-up interface 102 will receive the trigger signal from the mechanical switch 20. At this time, since the mechanical switch 20 is in a grounded state, the circuit between the mechanical switch 20 and the low-voltage power supply controller 10 will become a low level. When the duration of the low level reaches a preset duration, that is, the low-voltage power supply controller 10 receives a restart signal, the logic module 101 will control the low-voltage power supply controller 10 to send a reset signal to the relay 30.

Among them, the mechanical switch 20 can generally be set on the outside of the vehicle body, and can be a door cover switch of the type of vehicle door handle switch, charging port cover switch, and trunk switch, or a soft switch. When the mechanical switch 20 is a door cover switch of the type of vehicle door handle switch, charging port cover switch, and trunk switch, such a door cover switch can be set in the corresponding low-voltage power load 40; if it is a soft switch, the logic module 101 inside the soft switch needs electricity, so the logic module 101 inside the soft switch needs to be set in the low-voltage power supply controller 10 to ensure the normal operation of the soft switch. Those skilled in the art can determine the specific mechanical switch 20 connected to the vehicle low-voltage power supply circuit of this solution according to actual conditions.

In the present embodiment, the power control interface 103 is usually electrically connected to the relay 30 and is responsible for outputting a control signal to the relay 30. Among them, the contacts of the relay 30 are usually arranged on the line between the low-voltage power supply controller 10 and the low-voltage power load 40 of the vehicle, and are set to a normally closed state. Since the vehicle usually needs to ensure the normal operation of the low-voltage power load 40, it is necessary to keep the line connected. And the contacts of the relay 30 are arranged on the line between the low-voltage power supply controller 10 and the low-voltage power load 40 of the vehicle, which can ensure that the low-voltage power supply controller 10 can send a reset signal to the relay 30 after receiving the restart signal from the mechanical switch 20, and the relay 30 receives the reset signal and controls the switch of the contacts to realize the on-off of the low-voltage power supply circuit of the vehicle, thereby realizing the restart of the low-voltage power load 40 of the vehicle.

Furthermore, the communication interface 104 is usually connected to the vehicle low-voltage electrical load 40, and is used for signal transmission between the vehicle low-voltage electrical load 40 and the low-voltage power supply controller 10. The vehicle low-voltage electrical load 40 generally includes an automotive electronic control unit (Electronic Control Unit, referred to as ECU). The ECU is generally capable of controlling all other driver chips in the vehicle and managing all storage devices so that each function is executed in an orderly manner. Therefore, when the relay 30 receives the reset signal, the vehicle low-voltage power supply circuit is disconnected, so that the ECU can be powered off under the control of the relay 30, and then the relay 30 closes the contacts to restore the vehicle low-voltage power supply circuit, and the ECU will start synchronously, thereby restarting the ECU.

Furthermore, the current monitoring interface 105 is usually connected to the current sensor 50 to receive the current monitoring signal from the current sensor 50. An optional example of the current sensor 50 is a shunt resistor. The current sensor 50 can monitor the current in the vehicle low-voltage power supply circuit in real time, thereby effectively controlling the current in the vehicle low-voltage power supply circuit.

Furthermore, the voltage monitoring interface 106 is usually connected to a low voltage power supply to receive a voltage monitoring signal from the low voltage power supply 60. The low voltage power supply 60 can generally be set to a 12V lithium battery. Due to its characteristics, the 12V lithium battery is an ideal battery with good stability and reliability, and is very suitable as a power supply for small devices. Those skilled in the art can select a suitable low voltage power supply according to actual circuit requirements.

In this embodiment, the specific implementation process of this circuit includes: when the user only wants to open the door or trunk door of the vehicle outside the vehicle, short press the corresponding mechanical switch 20, then the mechanical switch 20 is closed, and the low-voltage power supply controller 10 detects that the level has become a low level through the wake-up interface 102. Then, when the user releases the mechanical switch 20, the mechanical switch 20 is disconnected, and the low-voltage power supply controller 10 detects that the level has been restored. During this period, since the duration of the level change does not reach the preset duration, the door cover corresponding to the mechanical switch 20 is opened.

When the vehicle needs to restart the low-voltage electrical load 40 in the vehicle due to a fault or the like in the low-voltage electrical load 40, a mechanical switch 20 with a restart function is selected, that is, a mechanical switch 20 of the vehicle low-voltage power supply circuit connected to the present embodiment, such as a trunk switch, and then a long press is performed in front of the corresponding mechanical switch 20. At this time, the mechanical switch 20 is closed, and the low-voltage power supply controller 10 detects that the power level becomes a low level through the wake-up interface 102. When the low level duration reaches a preset time, it indicates that the trigger signal is a restart signal. The low-voltage power supply controller 10 sends a reset signal to the relay 30 through the power control interface 103. After receiving the reset signal, the relay 30 detects whether the contact state of the relay 30 is in a closed state. If so, the contact connection is disconnected and then closed again; if the contact is already in a disconnected state, it is directly closed. The restart of the low-voltage electrical load 40 is achieved through this operation.

This low-voltage power supply circuit can restart the vehicle's low-voltage power load 40 without manual restart. The user only needs to operate a mechanical switch to restart the vehicle's low-voltage power load, without actively performing a restart operation, thereby reducing the difficulty of restarting the vehicle's low-voltage power load. There is also no need to add a corresponding switch to the vehicle body, and only the existing mechanical switch of the vehicle needs to be reused, thereby improving the applicability of the vehicle's low-voltage power supply circuit.

The present utility model further provides a vehicle. FIG3 is a schematic diagram of a vehicle according to an embodiment of the present utility model.

The vehicle 1 includes the low-voltage power supply circuit as described above, wherein the mechanical switch 20 may be a door switch 201 of the vehicle or a trunk switch 202 of the vehicle. The circuit structure of the low-voltage power supply circuit may refer to the above embodiment, and will not be described in detail here; it can be understood that since the vehicle of this embodiment adopts the technical solution of the above low-voltage power supply circuit, the vehicle has all the above beneficial effects.

At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims (10)

1. A low voltage power supply circuit for a vehicle, comprising:

a low voltage power supply controller having a wake-up interface and a power supply control interface;

the mechanical switch is arranged on the outer side of the vehicle body and is electrically connected with the wake-up interface;

The relay is arranged on a line of the vehicle, wherein the line is used for connecting low-voltage power consumption loads of the vehicle, and the control end of the relay is connected with the power control interface;

The power supply controller is also provided with a logic module, the logic module is respectively connected with the wake-up interface and the power supply control interface, and after the trigger signal of the mechanical switch is determined to be a preset restarting signal, a reset signal for driving the relay is sent out through the power supply control interface, so that the relay is reset.

2. The low voltage power supply circuit of claim 1, wherein,

The mechanical switch is a door cover switch of the vehicle, and is configured to convert different trigger operations into trigger signals having different durations, as the restart signal or the door cover operation signal, respectively.

3. The low voltage power supply circuit of claim 1, wherein,

The mechanical switch is also electrically connected to the vehicle low voltage electrical load and is configured to be operatively grounded, thereby having a ground signal as the trigger signal.

4. The low voltage power supply circuit of claim 1, wherein,

The contact of the relay is arranged on a circuit between the low-voltage power supply controller and the low-voltage power utilization load of the vehicle and is configured to be in a normally closed state.

5. The vehicle low voltage power supply circuit of claim 1, further comprising:

A current sensor for monitoring a current in the low voltage supply circuit;

The low-voltage power supply controller is provided with a current monitoring interface, and the current sensor is connected with the current monitoring interface and is used for outputting a current monitoring signal to the low-voltage power supply controller.

6. The low voltage power supply circuit of claim 1, wherein,

The low voltage power supply controller: the communication interface is connected with the low-voltage electric load of the vehicle and used for transmitting signals between the low-voltage electric load of the vehicle and the low-voltage power supply controller.

7. The low voltage power supply circuit of claim 1, wherein,

The low-voltage power supply is set as a 12V lithium battery;

The low-voltage electric load of the vehicle comprises an automobile electric control unit.

8. The low voltage power supply circuit of claim 1, wherein,

The mechanical switch comprises at least one or more of the following switches: a vehicle door handle switch, a charge flap switch, and a trunk switch.

9. The low voltage power supply circuit of claim 1, wherein,

The low-voltage power supply controller is provided with a voltage monitoring interface, and the voltage monitoring interface is connected with the low-voltage power supply and used for monitoring the low-voltage power supply.

10. A vehicle, characterized by comprising:

The vehicle low-voltage power supply circuit according to any one of claims 1 to 9.