Power supply cut-off holding circuit and vehicle

Abstract

The application relates to a power-off holding circuit of a power supply and a vehicle, wherein the power-off holding circuit comprises an input circuit, a control circuit, an output circuit and a self-resetting circuit, the control circuit and the output circuit are disconnected through the self-resetting circuit to cut off the output power supply path between the power supply and the output end of the power-off holding circuit, the power supply is powered off and the powered-off state is maintained; in addition, the self-resetting circuit has an automatic reset function, the control circuit and the output circuit can restore the on state after the self-resetting circuit is reset to the off state, therefore, after the input power supply path of the power supply is turned on through the input circuit again, the output power supply path between the power supply and the output end of the power-off holding circuit can be turned on, the power supply is normally powered, the method of cutting off or restoring the power supply of the power supply by using a controller is replaced, the method is easier to realize, the cost is reduced, and when the power supply is turned on again, no additional manual operation is needed, the operation is simplified, and the safety and reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of electronic and electrical technology, and in particular to power supply interruption and retention circuits and vehicles. Background Technology

[0002] According to GB 21668-2008, the structural requirements for vehicles transporting dangerous goods, a control device for opening and closing the main power switch should be installed in the driver's cab.

[0003] Currently, rocker switches are mainly installed in the driver's cab as power control switches to turn the vehicle's power on or off. When the driver presses the power control switch, the vehicle's power is cut off. However, the driver must turn the power control switch back on before starting the car, otherwise the car will not start. This is inconvenient, and if the driver forgets to turn on the power control switch, some electrical appliances will not be powered on, leading the driver to suspect that there is a malfunction in the car. Summary of the Invention

[0004] Therefore, it is necessary to provide a power cut-off and retention circuit and a vehicle that can cut off the power supply and restore normal power supply without manual operation to address the above-mentioned technical problems.

[0005] On one hand, embodiments of this application provide a power supply cut-off and holding circuit, the cut-off and holding circuit comprising:

[0006] An input circuit is used to connect to the power supply and to turn on or off the input power supply path of the power supply.

[0007] A control circuit, connected to the input circuit, is used to control the connection of the output power supply path between the power supply and the output terminal of the cut-off holding circuit when the input circuit turns on the input power supply path;

[0008] An output circuit is connected to the input circuit and the control circuit respectively, and is used to turn on the output power supply path when the control circuit is in the on state;

[0009] A self-reset circuit, connected to the control circuit, is used to select the conduction state of the control circuit and the output circuit.

[0010] In one embodiment, when the input circuit turns on the input power supply path and the self-reset circuit is in the on state, the control circuit is in the off state. The control circuit is used to control the cutting off of the output power supply path, so that the output circuit is in the off state.

[0011] When the input circuit turns on the input power supply path and the self-reset circuit is reset to the off state, the control circuit remains off, so that both the output power supply path and the output circuit remain off.

[0012] In one embodiment, the self-reset circuit includes a self-reset switch, the first end of which is connected to the control circuit, and the second end of which is grounded.

[0013] In one embodiment, the output circuit includes a first relay, and the control circuit includes a second relay; wherein,

[0014] The first end of the solenoid of the first relay is connected to the input circuit, the contact input terminal of the first relay, and the first end of the solenoid of the second relay. The second end of the solenoid of the first relay is connected to the normally closed contact terminal of the second relay. The contact input terminal of the first relay is connected to the input circuit and the first end of the solenoid of the second relay. The contact output terminal of the first relay serves as the output terminal of the cut-off holding circuit.

[0015] The first end of the solenoid of the second relay is connected to the input circuit, the second end of the solenoid of the second relay is grounded through the self-reset circuit, the second end of the solenoid of the second relay is also connected to the normally open contact of the second relay, the contact input of the second relay is grounded, and the normally open contact of the second relay is grounded through the self-reset circuit.

[0016] In one embodiment, when the input circuit is conducting the input power supply circuit and the self-reset circuit is in the off state, the power supply, the input circuit, the solenoid of the first relay, the contact input terminal of the second relay, the normally closed contact terminal of the second relay, and the ground point form a loop. The contact input terminal of the second relay and the normally open contact terminal of the second relay are disconnected, and the contact input terminal of the first relay and the contact output terminal of the first relay are connected, thus connecting the output power supply path.

[0017] In one embodiment, when the input circuit is conducting the input power supply circuit and the self-reset circuit is in the conducting state, the power supply, the input circuit, the solenoid of the second relay, the self-reset circuit and the ground point form a loop. The contact input terminal of the second relay is connected to the normally open contact terminal of the second relay, the contact input terminal of the second relay is disconnected from the normally closed contact terminal of the second relay, and the contact input terminal of the first relay is disconnected from the contact output terminal of the first relay, thus disconnecting the output power supply path.

[0018] In one embodiment, when the input circuit turns on the input power supply circuit and the self-reset circuit is reset to the off state, the power supply, the input circuit, the solenoid of the second relay, the contact input terminal of the second relay, the normally open contact terminal of the second relay, and the ground point form a loop. The contact input terminal of the second relay is disconnected from the normally closed contact terminal of the second relay, the contact input terminal of the first relay is kept disconnected from the contact output terminal of the first relay, and the output power supply path is kept disconnected.

[0019] In one embodiment, when the self-reset circuit is reset to the open state, when the input circuit disconnects the input power supply path, the contact input terminal of the second relay is connected to the normally closed contact terminal of the second relay, the contact input terminal of the second relay is disconnected from the normally open contact terminal of the second relay, the contact input terminal of the first relay remains disconnected from the contact output terminal of the first relay, and the output power supply path remains disconnected.

[0020] On the other hand, embodiments of this application provide a vehicle, the vehicle comprising:

[0021] power supply;

[0022] A power supply cut-off and holding circuit as described in any of the above embodiments; wherein the power supply is connected to the input circuit of the cut-off and holding circuit.

[0023] In one embodiment, the input circuit includes a vehicle ignition switch or the vehicle ignition switch and the vehicle power switch connected in series.

[0024] The power supply cut-off and holding circuit and vehicle provided in the above embodiments include an input circuit, a control circuit, an output circuit, and a self-reset circuit. The self-reset circuit disconnects the control circuit and the output circuit to cut off the output power supply path between the power supply and the output terminal of the cut-off and holding circuit, thus de-energizing and maintaining the power-off state. In addition, since the self-reset circuit has an automatic reset function, after the self-reset circuit is reset to the open state, it can restore the conduction state of the control circuit and the output circuit. Therefore, after the input power supply path where the power supply is located is re-energized through the input circuit, the output power supply path between the power supply and the output terminal of the cut-off and holding circuit can be re-energized, allowing the power supply to supply power normally. This replaces the method of cutting off or restoring power supply using a controller, is easier to implement, reduces costs, and eliminates the need for additional manual operation when power is restored, simplifying operation and improving safety and reliability. Attached Figure Description

[0025] Figure 1 A schematic diagram of the cut-off holding circuit provided for one embodiment;

[0026] Figure 2 A schematic diagram of the cut-off holding circuit provided in one embodiment;

[0027] Figure 3 A schematic diagram of the vehicle frame provided for one embodiment;

[0028] Figure 4 A schematic diagram of a cut-off holding circuit provided for one embodiment. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] As mentioned in the background section, after the vehicle's power is cut off using a power control switch, the power control switch needs to be manually turned back on before starting the vehicle again, which is cumbersome. Therefore, this application provides a power cut-off and holding circuit and a vehicle that can both cut off the power and turn it back on without manual operation, simplifying the process.

[0031] In one embodiment, such as Figure 1 As shown, a power supply cut-off and holding circuit 10 is provided. This power supply cut-off and holding circuit 10 includes an input circuit 110, a control circuit 120, an output circuit 130, and a self-reset circuit 140. The input circuit 110 is connected to the power supply and is used to connect or disconnect the input power supply path. The input circuit 110 can switch between two states: connecting the input power supply path and disconnecting the input power supply path. The control circuit 120 is connected to the input circuit 110 and is used to control the connection of the output power supply path between the power supply and the output terminal of the cut-off and holding circuit 10 when the input power supply path is connected by the input circuit 110. The output circuit 130 is connected to both the input circuit 110 and the control circuit 120, and is used to connect the output power supply path when the control circuit 120 is in the connected state. The self-reset circuit 140 is connected to the control circuit 120 and is used to select the connection or disconnection states of the control circuit 120 and the output circuit 130. The self-reset circuit 140 has an automatic reset function.

[0032] The power supply cut-off and holding circuit 10 provided in the above embodiment includes an input circuit 110, a control circuit 120, an output circuit 130, and a self-reset circuit 140. The self-reset circuit 140 disconnects the control circuit 120 and the output circuit 130 to cut off the output power supply path between the power supply and the output terminal of the cut-off and holding circuit, thus de-energizing and maintaining the power-off state. In addition, since the self-reset circuit 140 has an automatic reset function, after the self-reset circuit 140 is reset to the open state, it can restore the conduction state of the control circuit 120 and the output circuit 130. Therefore, after the input power supply path of the power supply is re-energized through the input circuit 110, the output power supply path between the power supply and the output terminal of the cut-off and holding circuit 10 can be re-energized, allowing the power supply to supply power normally. This replaces the method of using a controller to cut off or restore the power supply, which is easier to implement, reduces costs, and eliminates the need for additional manual operation when powering on again, simplifying operation and improving safety and reliability.

[0033] Please continue reading. Figure 1 In one embodiment, when the input circuit 110 is conducting the input power supply path and the self-reset circuit 140 is in the on state, the control circuit 120 is in the off state. The control circuit 120 is used to control the disconnection of the output power supply path between the power supply and the output terminal of the disconnection holding circuit 10, so that the output circuit 130 is in the off state. When the input circuit 110 is conducting the input power supply path and the self-reset circuit 140 is reset to the off state, the control circuit 120 remains in the on state, so that both the output power supply path and the output circuit 130 remain in the off state.

[0034] The power supply cut-off and holding circuit 10 provided in the above embodiment disconnects the control circuit 120 and the output circuit 130 through the self-reset circuit 140, thereby cutting off the output power supply path between the power supply and the output terminal of the cut-off and holding circuit, so that the power supply is de-energized and remains in a de-energized state. In addition, since the self-reset circuit 140 has an automatic reset function, after the self-reset circuit 140 is reset to the open state, it can restore the conduction state of the control circuit 120 and the output circuit 130. Therefore, after the input power supply path where the power supply is located is re-energized through the input circuit 110, the output power supply path between the power supply and the output terminal of the cut-off and holding circuit 10 can be re-energized, so that the power supply can supply power normally. This replaces the method of cutting off or restoring the power supply using a controller, which is easier to implement, reduces costs, and does not require additional manual operation when powering on again, simplifying operation and improving safety and reliability.

[0035] In one embodiment, such as Figure 2As shown, the self-reset circuit 140 may include a self-reset switch S2. The first terminal 1 of the self-reset switch S2 is connected to the control circuit 120, and the second terminal 2 of the self-reset switch is grounded. When the self-reset switch S2 is pressed, it is in the on state. When the self-reset switch S2 is released, it resets to the off state. Thus, by selecting the on / off state of the control circuit 120 and the output circuit 130 through the self-reset switch S2, the power supply can be cut off or automatically restored. This replaces the method of using a controller to control the electrical circuit, is easier to implement, reduces costs, and improves the safety and reliability of the circuit.

[0036] Please continue reading. Figure 2 In one embodiment, the output circuit 130 includes a first relay K1, which, for example, may be a normally open relay. The control circuit 120 includes a second relay K2, which, for example, may be a changeover single-pole double-throw relay.

[0037] In this circuit, the first terminal 1 of the solenoid of the first relay K1 is connected to the input circuit 110, the contact input terminal 3 of the first relay K1, and the first terminal 1 of the solenoid of the second relay K2. The second terminal 2 of the solenoid of the first relay K1 is connected to the normally closed contact terminal 4 of the second relay K2. The contact input terminal 3 of the first relay K1 is connected to the input circuit 110 and the first terminal 1 of the solenoid of the second relay K2. The contact output terminal 4 of the first relay K1 serves as the output terminal of the cut-off holding circuit 10. When the solenoid of the first relay K1 is not energized, the contact input terminal 3 and the contact output terminal 4 of the first relay K1 are disconnected. When the solenoid of the first relay K1 is energized, the contacts of the first relay K1 are closed, and the contact input terminal 3 and the contact output terminal 4 of the first relay K1 are connected.

[0038] The first terminal 1 of the solenoid of the second relay K2 is connected to the first terminal 1 of the solenoid of the first relay K1 and the contact input terminal 3 of the first relay K1. The first terminal 1 of the solenoid of the second relay K2 is also connected to the input circuit 110. The second terminal 2 of the solenoid of the second relay K2 is grounded through the self-reset circuit 140. The second terminal 2 of the solenoid of the second relay K2 is also connected to the normally open contact terminal 5 of the second relay K2. The contact input terminal 3 of the second relay K2 is grounded. The normally closed contact terminal 4 of the second relay K2 is connected to the second terminal 2 of the solenoid of the first relay K1. The normally open contact terminal 5 of the second relay K2 is also connected to the second terminal 2 of the solenoid of the second relay K2. The normally open contact terminal 5 of the second relay K2 is also grounded through the self-reset circuit 140. When the solenoid of the second relay K2 is not energized, the contact input terminal 3 of the second relay K2 is connected to the normally closed contact terminal 4 of the second relay K2, and the contact input terminal 3 of the second relay K2 is disconnected from the normally open contact terminal 5 of the second relay K2. When the coil of the second relay K2 is energized, the contacts of the second relay K2 change. The contact input terminal 3 of the second relay K2 is disconnected from the normally closed contact terminal 4 of the second relay K2, and the contact input terminal 3 of the second relay K2 is connected to the normally open contact terminal 5 of the second relay K2.

[0039] like Figure 2 As shown, for example, the self-reset circuit 140 includes a self-reset switch S2. The first terminal 1 of the self-reset switch S2 is connected to the second terminal 2 of the solenoid of the second relay K2 and the normally open contact terminal 5 of the second relay K2, respectively. The second terminal of the self-reset switch S2 is grounded.

[0040] The power cut-off and holding circuit 10 provided in the above embodiment uses two relays connected in series to achieve self-locking of the control electrical circuit and automatic restoration of the electrical circuit after power-off. This replaces the solution that uses only one relay or trigger to achieve a single cut-off of the electrical circuit and requires pressing the control switch again to restore the electrical circuit when restarting the vehicle. When this cut-off and holding circuit 10 is applied to the vehicle power supply scenario, the driver can start the vehicle directly without first operating the power control switch when starting the vehicle next time. The operation is simple and can eliminate the driver's concern that the vehicle may be faulty if the driver forgets to turn on the power control switch and cannot operate the pneumatic motor properly.

[0041] Please continue reading. Figure 2In one embodiment, when the input circuit 110 is conducting the input power supply circuit and the self-reset circuit 140 is in the off state, the power supply Vcc, the input circuit 110, the solenoid of the first relay K1, the contact input terminal 3 of the second relay K2, the normally closed contact terminal 4 of the second relay K2, and the ground point GND form a circuit. In this case, the solenoid of the second relay K2 is not energized. At this time, the contact input terminal 3 and the normally open contact terminal 5 of the second relay K2 are disconnected, while the solenoid of the first relay K1 is energized, the contacts of the first relay K1 are closed, and the contact input terminal 3 and the contact output terminal 4 of the first relay K1 are connected, thereby connecting the power supply and the output terminal of the cut-off holding circuit 10. The contact output terminal 4 of the first relay K1, i.e., the output terminal of the cut-off holding circuit 10, outputs the power supply voltage to power the device.

[0042] The power supply cut-off and holding circuit 10 provided in the above embodiment can, when the self-reset circuit 140 is in the off state, conduct the output power supply circuit between the power supply and the cut-off and holding circuit 10 through the input circuit 110, thereby realizing the power supply to the device.

[0043] Please continue reading. Figure 2 In one embodiment, when the input circuit 110 is conducting the input power supply circuit and the self-reset circuit 140 is in the conducting state, the power supply Vcc, the input circuit 110, the solenoid of the second relay K2, the self-reset circuit 140, and the ground point GND form a loop. In this case, the solenoid of the second relay K2 is energized, and the contacts of the second relay K2 change. The contact input terminal 3 of the second relay K2 is connected to the normally open contact terminal 5 of the second relay K2, and the contact input terminal 3 of the second relay K2 is disconnected from the normally closed contact terminal 4 of the second relay K2. Meanwhile, the solenoid of the first relay K1 is de-energized, causing the contact input terminal 3 of the first relay K1 to disconnect from the contact output terminal 4 of the first relay K1. This disconnects the output power supply path between the power supply and the output terminal of the cut-off holding circuit 10, and the contact output terminal 4 of the first relay K1, i.e., the output terminal of the cut-off holding circuit 10, has no power supply voltage output, thus stopping the power supply.

[0044] The power supply cut-off and holding circuit 10 provided in the above embodiment, when the input circuit 110 is conducting the input power supply circuit, switches the self-reset circuit 140 to the conducting state, and can cut off the output power supply circuit between the conducting power supply and the contact output terminal of the first relay K1 through the second relay K2, so that the contacts of the first relay K1 are in the open state, thereby realizing the power supply cut-off protection and improving the safety and reliability of the power supply.

[0045] Please continue reading. Figure 2In one embodiment, when the input circuit 110 is turned on and the self-reset circuit 20 is reset to the off state, the power supply Vcc, the input circuit 110, the solenoid of the second relay K2, the contact input terminal 3 of the second relay K2, the normally open contact terminal 5 of the second relay K2 and the grounding point GND form a loop. In this situation, the solenoid of the second relay K2 remains energized, causing the contact of the input terminal 3 of the second relay K2 to remain engaged at the normally open contact terminal 5. At this time, the input terminal 3 of the second relay K2 is connected to the normally open contact terminal 5, and the input terminal 3 of the second relay K2 is disconnected from the normally closed contact terminal 4. Meanwhile, the solenoid of the first relay K1 remains de-energized, causing the input terminal 3 of the first relay K1 to remain disconnected from the output terminal 4. The power supply path between the power supply and the output terminal of the cut-off holding circuit 10 also remains disconnected. Therefore, the output terminal 4 of the first relay K1, i.e., the output terminal of the cut-off holding circuit, still has no power supply voltage output and continues to stop supplying power.

[0046] The power supply cut-off and holding circuit 10 provided in the above embodiment automatically resets the self-reset circuit 140 to the open state when the input circuit 110 is conducting the input power supply circuit. The coil of the second relay K2 continues to be energized, so that the contacts of the first relay K1 remain open, thereby keeping the output power supply circuit in the open state. This achieves power cut-off protection while automatically maintaining the open state, further improving the safety and reliability of the power supply.

[0047] Please continue reading. Figure 2 In one embodiment, when the self-reset circuit 140 is reset to the open state, with the input power supply path disconnected by the input circuit 110, the coil of the second relay K2 is de-energized. At this time, the contacts of the second relay K2 change again, returning to the initial state. The contact input terminal 3 of the second relay K2 is connected to the normally closed contact terminal 4 of the second relay, and the contact input terminal 3 of the second relay K2 is disconnected from the normally open contact terminal 5 of the second relay K2. Meanwhile, the first relay K1 remains unenergized. At this time, the contact input terminal 3 of the first relay K1 and the contact output terminal 4 of the first relay K1 remain disconnected, and the output power supply path also remains disconnected. The contact output terminal 4 of the first relay K1 cuts off the power supply voltage output of the circuit, and the power supply continues to stop.

[0048] The power cut-off and holding circuit 10 provided in the above embodiment disconnects the input power supply circuit through the input circuit 110 when the self-reset circuit 140 is reset to the open state. This causes the coil of the second relay K2 to be de-energized, the contacts to switch, and the circuit to return to the initial state. When the power is restored, the coil of the first relay K1 can be energized, thereby connecting the output power supply circuit between the power supply and the contact output terminal of the first relay K1. This achieves power cut-off protection while automatically restoring the initial state without manual connection, simplifying the operation.

[0049] Please continue reading. Figure 2 In one embodiment, the input circuit 110 may include a switch S1. The first terminal 1 of switch S1 is connected to the power supply Vcc, and the second terminal 2 of switch S1 is connected to the first terminal 1 of the solenoid of the first relay K1, the contact input point 3 of the first relay K1, and the first terminal 1 of the solenoid of the second relay K2, respectively. When switch S1 is closed, the input power supply circuit containing the power supply Vcc is connected; when switch S1 is open, the input power supply circuit containing the power supply Vcc is disconnected. For example, switch S1 is a self-locking switch.

[0050] In one embodiment, such as Figure 3 As shown, a vehicle is provided. The vehicle includes a power supply 20 and a cut-off holding circuit 10 provided in any of the above embodiments. The power supply 20 is connected to the input circuit 110 in the cut-off holding circuit 10.

[0051] The vehicle provided in the above embodiment can easily achieve emergency power cut-off in critical situations by the driver / operator through the self-reset circuit 140 in the cut-off protection circuit 10, and normal power distribution can be restored without any additional operation when power is restored. The operation is simple and easy to implement.

[0052] In one embodiment, the input circuit 110 may include a vehicle ignition switch or a vehicle ignition switch and a vehicle power switch connected in series.

[0053] To better understand, combine Figure 2 and Figure 4 The following description will be based on the application of the power supply cut-off and holding circuit 10 provided in the above embodiment to a vehicle scenario. Figure 4 As shown, S2 is Figure 2 A schematic diagram of the self-reset switch S2, where K2 is... Figure 2 A physical schematic diagram of the second relay K2, where K1 is... Figure 2 A schematic diagram of the first relay K1, where S1 is... Figure 2 A physical schematic diagram of switch S1, all Figure 2 The physical implementation methods of the symbol of China Electric Appliance include, but are not limited to, Figure 4 The corresponding entity implementation method.

[0054] In practical applications, switch S1 is the main power switch. When the main power switch S1 is closed, the power supply Vcc, the main power switch S1, the solenoid of the first relay K1, the contact input terminal 3 and normally closed contact terminal 4 of the second relay K2 form a circuit with the grounding point GND. The contact input terminal 3 and contact output terminal 4 of the first relay K1 are engaged, and the contact output terminal 4 of the first relay K1 outputs a high voltage to power the car.

[0055] When it is necessary to disconnect the power supply to the entire vehicle, press the self-reset switch S2. The power supply Vcc, the coil of the second relay K2 of the main power switch S1, the self-reset switch S2 and the ground point GND form a circuit. The contacts of the second relay K2 switch. The input contact 3 of the second relay K2 is engaged with the normally open contact 5 and disengaged from the normally closed contact 4. The coil of the first relay K1 is de-energized, causing the contact input 3 and contact output 4 of the first relay K1 to disconnect, and the power to the entire vehicle is cut off.

[0056] When the self-reset switch S2 is released, the self-reset switch S2 resets to the open state. Since the power supply Vcc, the main power switch S1, the solenoid of the second relay K2, the normally open contact 5 and the contact input 3 of the second relay K2 form a circuit with the grounding point GND, the solenoid of the second relay K2 is continuously energized, so that the contact input 3 of the second relay K2 remains energized at the normally open contact 5, thereby keeping the contact output 4 of the first relay K1 de-energized.

[0057] After normal parking, disconnect the main power switch S1. The coil of the second relay K2 is de-energized, and the contacts of the second relay K2 return to their initial state. The engine can be started normally without reconnecting the self-reset switch S2 the next time you start the car.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A power supply cut-off and holding circuit, characterized in that, The cut-off holding circuit includes: An input circuit is used to connect to the power supply and to turn on or off the input power supply path of the power supply. A control circuit, connected to the input circuit, is used to control the connection of the output power supply path between the power supply and the output terminal of the cut-off holding circuit when the input circuit turns on the input power supply path; An output circuit is connected to the input circuit and the control circuit respectively, and is used to turn on the output power supply path when the control circuit is in the on state; A self-reset circuit, connected to the control circuit, is used to select the conduction state of the control circuit and the output circuit. The output circuit includes a first relay, and the control circuit includes a second relay; wherein... The first end of the solenoid of the first relay is connected to the input circuit, the contact input terminal of the first relay, and the first end of the solenoid of the second relay. The second end of the solenoid of the first relay is connected to the normally closed contact terminal of the second relay. The contact input terminal of the first relay is connected to the input circuit and the first end of the solenoid of the second relay. The contact output terminal of the first relay serves as the output terminal of the cut-off holding circuit. The first end of the solenoid of the second relay is connected to the input circuit, the second end of the solenoid of the second relay is grounded through the self-reset circuit, the second end of the solenoid of the second relay is also connected to the normally open contact of the second relay, the contact input of the second relay is grounded, and the normally open contact of the second relay is grounded through the self-reset circuit.

2. The power supply disconnection and holding circuit according to claim 1, characterized in that, When the input circuit is conducting the input power supply path and the self-reset circuit is in the conducting state, the control circuit is in the disconnected state. The control circuit is used to control the cutting off of the output power supply path, so that the output circuit is in the disconnected state. When the input circuit turns on the input power supply path and the self-reset circuit is reset to the off state, the control circuit remains off, so that both the output power supply path and the output circuit remain off.

3. The power supply disconnection and holding circuit according to claim 1, characterized in that, The self-reset circuit includes a self-reset switch, the first end of which is connected to the control circuit, and the second end of which is grounded.

4. The power supply disconnection and holding circuit according to claim 3, characterized in that, When the input circuit is conducting the input power supply path and the self-reset circuit is in the off state, the power supply, the input circuit, the solenoid of the first relay, the contact input terminal of the second relay, the normally closed contact terminal of the second relay, and the grounding point form a loop. The contact input terminal and the normally open contact terminal of the second relay are disconnected, and the contact input terminal and the contact output terminal of the first relay are connected, thus conducting the output power supply path.

5. The power supply cut-off and holding circuit according to claim 3, characterized in that, When the input circuit is conducting the input power supply path and the self-reset circuit is in the conducting state, the power supply, the input circuit, the solenoid of the second relay, the self-reset circuit and the ground point form a loop. The contact input terminal of the second relay is connected to the normally open contact terminal of the second relay, the contact input terminal of the second relay is disconnected from the normally closed contact terminal of the second relay, and the contact input terminal of the first relay is disconnected from the contact output terminal of the first relay, thus disconnecting the output power supply path.

6. The power supply disconnection and holding circuit according to claim 3, characterized in that, When the input circuit is conducting the input power supply path and the self-reset circuit is reset to the open state, the power supply, the input circuit, the solenoid of the second relay, the contact input terminal of the second relay, the normally open contact terminal of the second relay, and the ground point form a loop. The contact input terminal of the second relay is disconnected from the normally closed contact terminal of the second relay, the contact input terminal of the first relay is kept disconnected from the contact output terminal of the first relay, and the output power supply path is kept disconnected.

7. The cut-off and holding circuit according to claim 3, characterized in that, When the self-reset circuit is reset to the open state, when the input circuit disconnects the input power supply path, the contact input terminal of the second relay is connected to the normally closed contact terminal of the second relay, the contact input terminal of the second relay is disconnected from the normally open contact terminal of the second relay, the contact input terminal of the first relay is kept disconnected from the contact output terminal of the first relay, and the output power supply path is kept disconnected.

8. The cut-off and holding circuit according to claim 1, characterized in that, The first relay includes a normally open relay; the second relay includes a changeover type single-pole double-throw relay.

9. A vehicle, characterized in that, The vehicles include: power supply; The power supply cut-off and holding circuit as described in any one of claims 1-8; wherein the power supply is connected to the input circuit of the cut-off and holding circuit.

10. The vehicle according to claim 9, characterized in that, The input circuit includes a vehicle ignition switch or a vehicle ignition switch and a vehicle power switch connected in series.

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