Power supply circuit and power supply method

Abstract

The invention provides a power supply circuit and a power supply method. The power supply circuit comprises a battery pack, a switching circuit, a detection circuit, a first control circuit and a second control circuit. The switching circuit is electrically connected between the battery pack and the power receiving equipment, the first control circuit is used for outputting a first control signal to control the switching circuit to be switched on when the vehicle is in a first state, so that the battery pack provides power for the power receiving equipment, and the detection circuit is used for detecting whether the first control circuit normally outputs the first control signal or not; under the condition that the first control circuit does not output the first control signal normally, a trigger signal is output to the second control circuit, and the second control circuit outputs a second control signal based on the trigger signal so as to control the switch circuit to maintain conduction. By means of the power supply circuit, a dual control mechanism is formed through the first control circuit and the second control circuit, and stable power supply of the power receiving equipment on the vehicle can be guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to a power supply circuit and a power supply method. Background Art

[0002] When the vehicle is started, various powered devices on the vehicle (such as the instrument panel and the central control screen) need to maintain a stable power supply state, otherwise it may affect the driving safety of the vehicle. Therefore, how to ensure the stable power supply of the powered devices on the vehicle is a major problem to be solved. Summary of the invention

[0003] In view of this, it is necessary to provide a power supply circuit and a power supply method, which can ensure stable power supply to the powered equipment on the vehicle and prevent the powered equipment from failing due to power outage.

[0004] The embodiment of the present application provides a power supply circuit for providing power to a powered device of a vehicle, the power supply circuit comprising: a battery pack; a switch circuit, the switch circuit comprising an input end, an output end and a control end, the input end of the switch circuit being electrically connected to the battery pack, and the output end of the switch circuit being electrically connected to the powered device; a first control circuit, electrically connected to the control end of the switch circuit, the first control circuit being used to output a first control signal when the vehicle is in a first state to control the switch circuit to be turned on so that the battery pack provides power to the powered device; a second control circuit, electrically connected to the control end of the switch circuit; a detection circuit, electrically connected to the first control circuit and the second control circuit, being used to detect whether the first control circuit outputs the first control signal normally when the vehicle is in the first state, and output a trigger signal to the second control circuit when it is detected that the first control circuit does not output the first control signal normally; the second control circuit being used to output a second control signal based on the trigger signal to control the switch circuit to remain turned on.

[0005] In some embodiments, the first control circuit is further used to obtain the state of the vehicle, and to suspend outputting the first control signal when the vehicle is in a second state, wherein the first state is a non-ignition-off state and the second state is an ignition-off state.

[0006] In some embodiments, the detection circuit includes: a first resistor, one end of which is electrically connected to the first control circuit; a second resistor, one end of which is electrically connected to the other end of the first resistor, and the other end is grounded; a first switching element, including a first end, a second end and a control end, the first end of the first switching element is electrically connected to the second control circuit, the control end of the first switching element is electrically connected to the other end of the first resistor, and the second end of the first switching element is grounded; a third resistor, one end of which is used to receive a first power supply voltage, and the other end is electrically connected to the first end of the first switching element.

[0007] In some embodiments, the switching circuit includes: a fourth resistor, one end of which is electrically connected to the battery pack; a second switching element, including a first end, a second end and a control end, the first end of the second switching element is electrically connected to the other end of the fourth resistor, and the control end of the second switching element is electrically connected to the first control circuit and the second control circuit; a fifth resistor, electrically connected between the control end and the first end of the second switching element; a first capacitor, connected in parallel with the fifth resistor; a second capacitor, one end of which is electrically connected to the second end of the second switching element and the other end is grounded; a sixth resistor, one end of which is electrically connected to the second end of the second switching element and the other end is grounded; a seventh resistor, one end of which is electrically connected to the second end of the second switching element and the other end is electrically connected to the.

[0008] In some embodiments, the second switch element includes one of a triode, a metal oxide semiconductor field effect transistor, and a relay.

[0009] In some embodiments, the first control circuit includes: a first control chip; an eighth resistor, one end of which is electrically connected to the first control chip; a ninth resistor, one end of which is electrically connected to the other end of the eighth resistor, and the other end is grounded; a third switch element, including a first end, a second end and a control end, the control end of the third switch element is electrically connected to the other end of the eighth resistor, the first end of the third switch element is electrically connected to the switch circuit, and the second end of the third switch element is grounded.

[0010] In some embodiments, the second control circuit includes: a second control chip; a tenth resistor, one end of which is electrically connected to the second control chip; an eleventh resistor, one end of which is electrically connected to the other end of the tenth resistor, and the other end is grounded; a third capacitor, one end of which is electrically connected to one end of the tenth resistor, and the other end is grounded; a fourth switch element, including a first end, a second end and a control end, the control end of the fourth switch element is electrically connected to the other end of the tenth resistor, the first end of the fourth switch element is electrically connected to the switch circuit, and the second end of the fourth switch element is grounded.

[0011] In some embodiments, the powered device includes an instrument panel and a central control screen, the first control chip is an intelligent cockpit integrated domain controller, and the second control chip is a micro control unit.

[0012] By adopting the above technical solution, a dual control mechanism of the switch circuit is formed by configuring the first control circuit and the second control circuit. The detection circuit is used to detect whether the first control circuit normally outputs the control signal for controlling the conduction of the switch circuit. When it is determined that the first control circuit does not normally output the control signal, the second control circuit is started to output the control signal. This can ensure stable power supply to the power receiving equipment on the vehicle in a non-ignition-off state. The circuit structure is simple, the reliability is high, the layout area on the circuit board is small, and it is easy to be arranged on the vehicle power control circuit board.

[0013] An embodiment of the present application also provides a power supply method for controlling a battery pack to provide power to a powered device of a vehicle, wherein the battery pack is electrically connected to the powered device via a switching circuit, and the method comprises: when the vehicle is in a first state, controlling a first control circuit to output a first control signal to control the switching circuit to be turned on, so that the battery pack provides power to the powered device; detecting whether the first control circuit fails to output the first control signal normally; and when it is detected that the first control circuit fails to output the first control signal normally, enabling a second control circuit to output a second control signal to maintain the switching circuit turned on via the second control signal.

[0014] In some embodiments, the method further includes: when the vehicle is in a second state, controlling the first control circuit to suspend outputting the first control signal, the first state being a non-ignition-off state, and the second state being an ignition-off state.

[0015] By adopting the above technical solution, a dual control mechanism of the switch circuit is formed by configuring the first control circuit and the second control circuit. The detection circuit is used to detect whether the first control circuit normally outputs the control signal used to control the conduction of the switch circuit. When it is determined that the first control circuit does not normally output the control signal, the second control circuit is started to output the control signal, thereby ensuring stable power supply to the power receiving equipment on the vehicle when the engine is not turned off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a functional module diagram of an implementation of the power supply circuit of the present application.

[0017] Figure 2 is a circuit diagram of an implementation of the detection circuit of the present application.

[0018] Figure 3 It is a circuit diagram of one implementation of the switch circuit, the first control circuit and the second control circuit of the present application.

[0019] Figure 4 It is a step flow chart of an implementation method of the power supply method of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application.

[0021] It is understandable that the connection relationship described in this application refers to direct or indirect connection. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, A and C can be directly connected, and C and B can be directly connected, so that A and B are connected through C. It is also understandable that the "A connects B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0022] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0023] In the description of this application, words such as "first" and "second" are only used to distinguish different objects, and do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0024] The technical solution of the present application is further described in detail below in conjunction with the accompanying drawings.

[0025] See also Figure 1 The power supply circuit 10 provided in one embodiment of the present application can be used to provide power to a power receiving device 20 of a vehicle. The embodiment of the present application does not limit the power receiving device 20 of the vehicle, and the vehicle can be a two-wheeled vehicle, a three-wheeled vehicle, a four-wheeled vehicle, etc. Taking a car as an example, the power receiving device 20 can refer to a low-voltage power receiving device in the vehicle, including but not limited to a dashboard, a central control screen, and lamps inside and outside the vehicle.

[0026] The power supply circuit 10 may include a battery pack 101 , a switch circuit 102 , a first control circuit 103 , a detection circuit 104 and a second control circuit 105 .

[0027] The battery pack 101 may include a plurality of batteries connected in series, in parallel, or in combination of series and parallel. The battery may be a lithium battery, a lead-acid battery, or the like.

[0028] The switch circuit 102 includes an input terminal, an output terminal and a control terminal. The input terminal of the switch circuit 102 is electrically connected to the battery pack 101 , and the output terminal of the switch circuit 102 is electrically connected to the powered device 20 .

[0029] In some embodiments, the operating voltage of the powered device 20 is generally 5V or 12V, and the voltage received by the input end of the switch circuit 102 is generally a 12V DC voltage. If the voltage output by the battery pack 101 is higher, the voltage output by the battery pack 101 can also be output to the input end of the switch circuit 102 after DC-DC conversion.

[0030] The first control circuit 103 is electrically connected to the control end of the switch circuit 102, and the first control circuit 103 is used to output a first control signal to control the switch circuit 102 to be turned on when the vehicle is in the first state, so that the battery pack 101 can provide power to the powered device 20. For example, the first state is a non-ignition state, so that when the vehicle is in the non-ignition state, the battery pack 101 can provide power to the powered device 20 to avoid affecting the driving safety of the vehicle.

[0031] The second control circuit 105 is electrically connected to the control end of the switch circuit 102. The detection circuit 104 is electrically connected to the first control circuit 103 and the second control circuit 105. The detection circuit 104 is used to detect whether the first control circuit 103 normally outputs the first control signal when the vehicle is in the first state, and output a trigger signal to the second control circuit 105 when it is detected that the first control circuit 103 does not normally output the first control signal. The second control circuit 105 is used to output a second control signal based on the trigger signal to control the switch circuit 103 to remain on.

[0032] The switch circuit 102 may include one of a triode, a metal oxide semiconductor field effect transistor, and a relay. The switch circuit 102 is controlled to be turned on by the first control signal or the second control signal, so that the battery pack 101 can provide power to the powered device 20 .

[0033] The first control signal and the second control signal may both be high level signals or both be low level signals. The trigger signal may be a high level signal or a low level signal.

[0034] In some embodiments, the first control circuit can obtain the state of the vehicle, and the state of the vehicle includes a first state and a second state. The first state is a non-ignition-off state or a power-on state, and the second state is an ignition-off state or a power-off state. When the vehicle is in the second state, the first control circuit 103 can suspend outputting the first control signal, and the detection circuit 104 stops detecting whether the first control circuit 103 normally outputs the first control signal.

[0035] In some embodiments, the first control circuit 103 and the second control circuit 105 may be implemented by a circuit module or a control chip having a control function. Taking a four-wheeled vehicle as an example, the first control circuit 103 may include a first control chip, which may be an integrated cockpit controller (ICC), and the second control circuit 105 may include a second control chip, which may be a microcontroller unit (MCU).

[0036] The power supply circuit of the present application configures a first control circuit 103 and a second control circuit 105 to form a dual control protection mechanism for the switch circuit 102. The detection circuit 104 is used to detect whether the first control circuit 103 normally outputs a control signal for controlling the conduction of the switch circuit 102. When it is determined that the first control circuit 103 does not normally output the control signal, the second control circuit 105 is triggered to output the control signal. This can ensure stable power supply to the power receiving device 20 on the vehicle in a non-ignition-off state, thereby improving the safety of vehicle driving.

[0037] See also Figure 2 The detection circuit 104 is electrically connected to the first control circuit 103 and the second control circuit 105 .

[0038] The detection circuit 104 may include a first resistor R1, a second resistor R2, a first switch element S1 and a third resistor R3. One end of the first resistor R1 is electrically connected to the first control circuit 103, and one end of the first resistor R1 is used to receive a first control signal output by the first control circuit 103. One end of the second resistor R2 is electrically connected to the other end of the first resistor R1, and the other end of the second resistor R2 is grounded. The first switch element S1 includes a first end, a second end and a control end. The first end of the first switch element S1 is electrically connected to the second control circuit 105, and the first end of the first switch element S1 is used to output a trigger signal. The control end of the first switch element S1 is electrically connected to the other end of the first resistor R1, and the second end of the first switch element S1 is grounded. One end of the third resistor R3 is used to receive a first power supply voltage Vcc, and the other end of the third resistor R3 is electrically connected to the first end of the first switch element S1.

[0039] In some embodiments, Figure 2 The circuit structure shown does not constitute a limitation on the circuit structure of the detection circuit 104. The circuit structure of the detection circuit 104 can be adjusted according to actual needs to output a corresponding high-level signal or a low-level signal to the second control circuit 105 based on the presence or absence of the first control signal. For example, one or more of the first resistor R1, the second resistor R2, and the third resistor R3 can also be omitted. For example, the first resistor R1 can be omitted, or the second resistor R2 can be omitted, etc.

[0040] For example, the first power supply voltage Vcc may be 3.3V, the second control circuit 105 includes an MCU, and the first power supply voltage Vcc may also be the power supply voltage of the MCU, that is, one end of the third resistor R3 may be electrically connected to the power pin of the MCU. The first switch element S1 may be a switch element such as a triode, a metal oxide semiconductor field effect transistor, etc. Taking the first control signal as a high-level signal as an example, the first switch element S1 is an NPN transistor. When the first control circuit 103 outputs the first control signal normally, the control end (base) of the first switch element S1 is high level, the first switch element S1 is turned on, and the first end (collector) of the first switch element S1 is low level, that is, the second control circuit 105 can receive a low-level signal. When the first control circuit 103 does not output the first control signal normally, the control end of the first switch element S1 is low level, the first switch element S1 is turned off, and the first end of the first switch element S1 is high level, that is, the second control circuit 105 can receive a high-level signal (trigger signal). The second control circuit 105 can output a second control signal based on the level signal to achieve taking over the first control circuit 103 to maintain the on-state of the switch circuit 102.

[0041] In some embodiments, a high level signal may refer to a voltage signal greater than 1.8V or 2.4V, and a low level signal may refer to a voltage signal less than 0.8V or 0.5V.

[0042] See also Figure 3 , the switch circuit 102 may include a fourth resistor R4, a second switch element S2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1 and a second capacitor C2. One end of the fourth resistor R4 is electrically connected to the battery pack 101, and is used to receive the voltage output by the battery pack 101. Since the working voltage of the powered device 20 is generally 5V or 12V, the voltage received by the input end of the switch circuit 102 is generally a 12V DC voltage. If the voltage output by the battery pack 101 is higher, the voltage output by the battery pack 101 can also be output to one end of the fourth resistor R4 after DC-DC conversion. Figure 3The voltage received at one end of the fourth resistor R4 is illustrated as a 12V DC voltage. The second switch element S2 includes a first end, a second end and a control end. The first end of the second switch element S2 is electrically connected to the other end of the fourth resistor R4, and the control end of the second switch element S2 is electrically connected to the first control circuit 103 and the second control circuit 105. The fifth resistor R5 is electrically connected between the control end and the first end of the second switch element S2, and the first capacitor C1 is connected in parallel with the fifth resistor R5. One end of the second capacitor C2 is electrically connected to the second end of the second switch element S2, and the other end of the second capacitor C2 is grounded. One end of the sixth resistor R6 is electrically connected to the second end of the second switch element S2, and the other end of the sixth resistor R6 is grounded. One end of the seventh resistor R7 is electrically connected to the second end of the second switch element S2, and the other end of the seventh resistor R7 is electrically connected to the powered device 20.

[0043] Figure 3 The circuit structure shown does not constitute a limitation on the circuit structure of the switch circuit 102. The circuit structure of the switch circuit 102 can be adjusted according to actual needs to achieve on / off based on the presence or absence of the first control signal / the second control signal. For example, some resistors or capacitors in the switch circuit 102 can be omitted. For example, the fifth resistor R5, the seventh resistor R7, the second capacitor C2, etc. can be omitted.

[0044] In some embodiments, the turn-on time of the second switch element S2 is too fast and may cause the Miller effect. This problem can be avoided by adjusting the values ​​of the capacitor and the resistor in the switch circuit 102 .

[0045] In some embodiments, the second switch element S2 may be a switch element such as a triode, a metal oxide semiconductor field effect transistor, etc. Figure 3 Taking the second switch element S2 as a PNP transistor as an example, the first end of the second switch element S2 is the emitter, the second end is the collector, and the control end is the base.

[0046] In some embodiments, the first control circuit 103 includes a first control chip U1, an eighth resistor R8, a ninth resistor R9 and a third switch element S3. One end of the eighth resistor R8 is electrically connected to the first control chip U1, and the eighth resistor R8 is used to receive the first control signal output by the first control chip U1. One end of the ninth resistor R9 is electrically connected to the other end of the eighth resistor R8, and the other end of the ninth resistor R9 is grounded. The third switch element S3 includes a first end, a second end and a control end, the control end of the third switch element S3 is electrically connected to the other end of the eighth resistor R8, the first end of the third switch element S3 is electrically connected to the control end of the second switch element S2, and the second end of the third switch element S3 is grounded. The first control chip U1 can be a chip with a control function, including but not limited to a processor, a single-chip microcomputer, a micro control unit, a programmable logic circuit, etc.

[0047] In some embodiments, the third switch element S3 may be a switch element such as a triode, a metal oxide semiconductor field effect transistor, etc. Figure 3 Taking the third switch element S3 as an NPN transistor as an example, the first end of the third switch element S3 is the collector, the second end is the emitter, and the control end is the base.

[0048] Figure 3 The circuit structure shown does not constitute a limitation on the circuit structure of the first control circuit 103 , and the circuit structure of the first control circuit 103 may be adjusted according to actual needs. For example, the eighth resistor R8 or the ninth resistor R9 may be omitted.

[0049] In some embodiments, the second control circuit 105 includes a second control chip U2, a tenth resistor R10, an eleventh resistor R11, a third capacitor C3 and a fourth switch element S4. One end of the tenth resistor R10 is electrically connected to the second control chip U2, and the second control chip U2 is used to output a second control signal based on the trigger signal. Figure 3 The second control chip U2 is taken as an MCU for illustration. The tenth resistor R10 is used to receive the second control signal. One end of the eleventh resistor R11 is electrically connected to the other end of the tenth resistor R10, and the other end of the eleventh resistor R11 is grounded. One end of the third capacitor C3 is electrically connected to one end of the tenth resistor R10, and the other end of the third capacitor C3 is grounded. The fourth switch element S4 includes a first end, a second end and a control end, the control end of the fourth switch element S4 is electrically connected to the other end of the tenth resistor R10, the first end of the fourth switch element S4 is electrically connected to the control end of the second switch element S2, and the second end of the fourth switch element S4 is grounded.

[0050] In some embodiments, the fourth switch element S4 may be a switch element such as a triode, a metal oxide semiconductor field effect transistor, etc. Figure 3 Taking the fourth switch element S4 as an NPN transistor as an example, the first end of the fourth switch element S4 is the collector, the second end is the emitter, and the control end is the base.

[0051] Figure 3 The circuit structure shown does not limit the circuit structure of the second control circuit 105 , and the circuit structure of the second control circuit 105 may be adjusted according to actual needs. For example, the tenth resistor R10 or the eleventh resistor R11 or the third capacitor C3 may be omitted.

[0052] The components used in the power supply circuit of this application are simple, the component price is low, the number is relatively small, the reliability is high, and the overall circuit board layout area can be less than 0.6cm 2 The layout area on the circuit board is small, which makes it easy to be laid out on the existing vehicle power control circuit board.

[0053] See also Figure 4 The embodiment of the present application also provides a power supply method for controlling the battery pack 101 to provide power to the powered device 20 of the vehicle, wherein the battery pack 101 is electrically connected to the powered device 20 via the switch circuit 102. The power supply method includes:

[0054] S400, obtaining a vehicle state, where the vehicle state includes a first state and a second state.

[0055] In some embodiments, the first state may be a non-ignition state, and the second state may be an ignition-off state.

[0056] S401 , when the vehicle is in a first state, controlling the first control circuit 103 to output a first control signal to control the switch circuit 102 to be turned on, so that the battery pack 101 provides power to the powered device 20 .

[0057] S402, detecting whether the first control circuit 103 fails to normally output the first control signal.

[0058] S403 , when it is detected that the first control circuit does not normally output the first control signal, the second control circuit 105 is enabled to output the second control signal, so as to maintain the switch circuit 102 turned on through the second control signal.

[0059] When it is detected that the first control circuit normally outputs the first control signal, step S401 may be continued to be executed, that is, the switch circuit 102 is continued to be controlled to be turned on by the first control signal, so that the battery pack 101 provides power to the powered device 20 .

[0060] S404, when the vehicle is in the second state, controlling the first control circuit 103 to stop outputting the first control signal.

[0061] The above power supply method configures the first control circuit and the second control circuit to form a dual control mechanism of the switch circuit, detects whether the first control circuit normally outputs the control signal for controlling the conduction of the switch circuit through the detection circuit, and when it is determined that the first control circuit does not normally output the control signal, starts the second control circuit to output the control signal, thereby ensuring stable power supply to the power receiving equipment on the vehicle when the engine is not turned off.

[0062] For those skilled in the art, other corresponding changes or adjustments can be made according to the application scheme and application structure of this application in combination with actual production needs, and these changes and adjustments should all fall within the scope disclosed in this application.

Claims

1. A power supply circuit for providing power to a power receiving device of a vehicle, characterized in that: The power supply circuit comprises: Battery pack; A switch circuit, the switch circuit comprising an input end, an output end and a control end, the input end of the switch circuit being electrically connected to the battery pack, and the output end of the switch circuit being electrically connected to the powered device; a first control circuit, electrically connected to a control end of the switch circuit, the first control circuit being used to output a first control signal to control the switch circuit to be turned on when the vehicle is in a first state, so that the battery pack provides power to the powered device; A second control circuit, electrically connected to the control end of the switch circuit; a detection circuit, electrically connected to the first control circuit and the second control circuit, for detecting whether the first control circuit normally outputs the first control signal when the vehicle is in the first state, and outputting a trigger signal to the second control circuit when it is detected that the first control circuit does not normally output the first control signal; The second control circuit is used to output a second control signal based on the trigger signal to control the switch circuit to remain turned on.

2. The power supply circuit according to claim 1, characterized in that: The first control circuit is further used to obtain the state of the vehicle, and suspend outputting the first control signal when the vehicle is in a second state, wherein the first state is a non-ignition-off state and the second state is an ignition-off state.

3. The power supply circuit according to claim 1, characterized in that: The detection circuit comprises: A first resistor, one end of which is electrically connected to the first control circuit; A second resistor, one end of which is electrically connected to the other end of the first resistor and the other end of which is grounded; A first switch element, comprising a first end, a second end and a control end, wherein the first end of the first switch element is electrically connected to the second control circuit, the control end of the first switch element is electrically connected to the other end of the first resistor, and the second end of the first switch element is grounded; The third resistor has one end for receiving the first power supply voltage and the other end electrically connected to the first end of the first switch element.

4. The power supply circuit according to claim 1, characterized in that: The switch circuit comprises: a fourth resistor, one end of which is electrically connected to the battery pack; A second switch element, comprising a first end, a second end and a control end, the first end of the second switch element being electrically connected to the other end of the fourth resistor, and the control end of the second switch element being electrically connected to the first control circuit and the second control circuit; a fifth resistor, electrically connected between the control terminal and the first terminal of the second switch element; A first capacitor connected in parallel with the fifth resistor; A second capacitor, one end of which is electrically connected to the second end of the second switch element and the other end of which is grounded; a sixth resistor, one end of which is electrically connected to the second end of the second switch element and the other end of which is grounded; A seventh resistor has one end electrically connected to the second end of the second switch element, and the other end electrically connected to the powered device.

5. The power supply circuit according to claim 4, characterized in that: The second switch element includes one of a triode, a metal oxide semiconductor field effect transistor, and a relay.

6. The power supply circuit according to claim 1, characterized in that: The first control circuit comprises: A first control chip; an eighth resistor, one end of which is electrically connected to the first control chip; a ninth resistor, one end of which is electrically connected to the other end of the eighth resistor and the other end of which is grounded; The third switch element comprises a first end, a second end and a control end, the control end of the third switch element is electrically connected to the other end of the eighth resistor, the first end of the third switch element is electrically connected to the switch circuit, and the second end of the third switch element is grounded.

7. The power supply circuit according to claim 1, characterized in that: The second control circuit comprises: A second control chip; a tenth resistor, one end of which is electrically connected to the second control chip; an eleventh resistor, one end of which is electrically connected to the other end of the tenth resistor and the other end of which is grounded; a third capacitor, one end of which is electrically connected to one end of the tenth resistor and the other end of which is grounded; The fourth switch element comprises a first end, a second end and a control end, the control end of the fourth switch element is electrically connected to the other end of the tenth resistor, the first end of the fourth switch element is electrically connected to the switch circuit, and the second end of the fourth switch element is grounded.

8. The power supply circuit according to claim 7, characterized in that: The powered device includes an instrument panel and a central control screen, the first control chip is an intelligent cockpit integrated domain controller ICC, and the second control chip is a micro control unit MCU.

9. A power supply method for controlling a battery pack to provide power to a power receiving device of a vehicle, wherein the battery pack is electrically connected to the power receiving device via a switch circuit, characterized in that: The method comprises: When the vehicle is in a first state, controlling the first control circuit to output a first control signal to control the switch circuit to be turned on so that the battery pack provides power to the powered device; detecting whether the first control circuit fails to normally output the first control signal; When it is detected that the first control circuit does not normally output the first control signal, the second control circuit is enabled to output a second control signal, so as to maintain the switch circuit turned on through the second control signal.

10. The power supply method according to claim 9, characterized in that: The method further comprises: When the vehicle is in a second state, the first control circuit is controlled to suspend outputting the first control signal, the first state is a non-ignition-off state, and the second state is an ignition-off state.

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