Power supply circuit and vehicle
By using a power supply circuit and multiple switching circuits in the automotive circuit, control signals with different duty cycles are generated according to load requirements, which solves the problem of a large number of hardware circuits in the existing technology, achieves efficient circuit utilization and reduces costs.
Patent Information
- Application Number
- CN202422968849.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-12-03
AI Technical Summary
In existing automotive circuit designs, there is a one-to-one relationship between functions and hardware circuits, which leads to an increase in the number of hardware circuits and electronic components, high costs and large size.
A power supply circuit is used to generate control signals with different duty cycles according to load requirements through a control circuit and multiple switching circuits, thereby supplying power to multiple loads and reducing the number of power supply circuits and the circuit size.
Multiple loads can be powered by one power circuit, which reduces the number and cost of circuits, improves the utilization of power circuits, and reduces design costs.
Smart Images
Figure CN223327446U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicles, and in particular to a power supply circuit and a vehicle. Background Art
[0002] In current automotive circuit design, functions and hardware circuits typically have a one-to-one relationship. That is, each function is implemented by a separate, independent hardware circuit. For example, the daytime running lights (DRLs) are constantly on when activated, while the turn signals alternate between on and off. Therefore, two power supply circuits are designed to control the DRLs and turn signals, respectively. This increases the number of hardware circuits and electronic components, hindering cost and size reduction. Utility Model Content
[0003] In order to solve the problems in the prior art, the present application provides a power supply circuit and a vehicle to improve the utilization rate of the power supply circuit in the vehicle.
[0004] The present application provides a power supply circuit for use in a vehicle, wherein the vehicle includes multiple loads; the power supply circuit includes:
[0005] A power supply circuit, wherein the input end of the power supply circuit is used to receive a power supply voltage, and the power supply circuit is used to convert the power supply voltage into an operating voltage and output the operating voltage;
[0006] a plurality of switch circuits, wherein first ends of the plurality of switch circuits are electrically connected to the output end of the power supply circuit, second ends of the plurality of switch circuits are used to be electrically connected to the plurality of loads in a one-to-one correspondence, and third ends of the plurality of switch circuits are used to receive control signals;
[0007] a control circuit, the control circuit being electrically connected to the third terminals of the plurality of switch circuits respectively; the control circuit being configured to receive a trigger signal and generate a control signal having a corresponding duty cycle based on the trigger signal;
[0008] The plurality of switch circuits are used to switch on / off the path between the corresponding first end and the second end based on the control of a control signal with a corresponding duty cycle, and output an operating voltage with a corresponding current.
[0009] In one embodiment, the switching circuit includes a switching tube;
[0010] The first end of the switch tube is electrically connected to the output end of the power supply circuit, the second end of the switch tube is used to be electrically connected to the load, and the third end of the switch tube is used to receive a control signal;
[0011] The switch tube is used to be turned on / off based on the control of the control signal and output an operating voltage with a corresponding current.
[0012] In one embodiment, the switch circuit further includes a current limiting resistor;
[0013] The first end of the current limiting resistor is electrically connected to the second end of the switch tube, and the second end of the current limiting resistor is used to be electrically connected to the load;
[0014] The switch tube is used to be turned on / off based on the control of the control signal; the second end of the current limiting resistor is used to output a working voltage with a corresponding current; the resistance values of the current limiting resistors of the multiple switch circuits are different.
[0015] In one embodiment, the power supply circuit includes a first switch circuit and a second switch circuit; the vehicle includes a first load and a second load;
[0016] A first end of the first switch circuit is electrically connected to the output end of the power supply circuit, a second end of the first switch circuit is used to be electrically connected to the first load, and a third end of the first switch circuit is electrically connected to the control circuit;
[0017] A first end of the second switch circuit is electrically connected to the output end of the power supply circuit, a second end of the second switch circuit is used to be electrically connected to the second load, and a third end of the second switch circuit is electrically connected to the control circuit;
[0018] The control circuit is used to output a first control signal with a first duty cycle based on a first trigger signal; the first switching circuit is used to be turned on / off based on the control of the first control signal, and output an operating voltage with a first preset current; the control circuit is used to output a second control signal with a second duty cycle based on a second trigger signal; the second switching circuit is used to be turned on / off based on the control of the second control signal, and output an operating voltage with a second preset current; the magnitude of the first preset current is different from the magnitude of the second preset current.
[0019] In one embodiment, the first load includes a daytime running light, and the second load includes a turn signal light.
[0020] In one embodiment, the power supply circuit further includes a voltage detection circuit;
[0021] The voltage detection circuit has a plurality of voltage detection terminals, each of which is electrically connected to the third terminals of the plurality of switch circuits in a one-to-one correspondence; the voltage detection circuit is used to detect the output voltage of the plurality of switch circuits and output an abnormality signal when the detected voltage is outside a preset voltage range;
[0022] The control circuit is used to control the corresponding switch circuit to be disconnected based on the abnormal signal.
[0023] In one embodiment, the power supply circuit further includes a current detection circuit;
[0024] The current detection circuit has a plurality of current detection terminals, and the plurality of current detection terminals are electrically connected to the third terminals of the plurality of switch circuits in a one-to-one correspondence; the current detection circuit is used to detect the output current of the plurality of switch circuits and output an abnormal signal when the detected current is outside a preset current range;
[0025] The control circuit is used to control the corresponding switch circuit to be disconnected based on the abnormal signal.
[0026] In one embodiment, the power supply circuit includes a voltage conversion circuit;
[0027] The voltage conversion circuit is used to convert the power supply voltage into an operating voltage and output the operating voltage.
[0028] In one embodiment, the power supply circuit further includes a filter circuit;
[0029] The filtering circuit is used to filter the operating voltage.
[0030] The present application also provides a vehicle, comprising a plurality of loads and the above-mentioned power supply circuit;
[0031] The power supply circuit is used to supply power to the plurality of loads.
[0032] The present application uses a power supply circuit to output an operating voltage, and a control circuit to control the on / off switching of multiple switch circuits based on a trigger signal to output the preset current required by different loads, thereby enabling a single power supply circuit to power multiple loads. This reduces the number of power supply circuits, reduces circuit size and cost, and improves power supply circuit utilization. Furthermore, the power supply circuit of the present application can be implemented by adding multiple switch circuits to the existing power supply circuit, reducing the cost of redeveloping and designing the power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 Schematic diagram of the module structure of the power supply circuit in one embodiment of the present application.
[0034] Figure 2 Schematic diagram of the structure of the power supply circuit in one embodiment of the present application.
[0035] Figure 3 Schematic diagram of the structure of the switch circuit in one embodiment of the present application.
[0036] Figure 4 Schematic diagram of the structure of a switch circuit in another embodiment of the present application.
[0037] Figure 5Schematic diagram of the module structure of the power supply circuit in another embodiment of the present application.
[0038] Figure 6 Schematic diagram of the module structure of the power supply circuit in one embodiment of the present application.
[0039] Description of main component symbols
[0040] Power supply circuit 100
[0041] Power supply circuit 110
[0042] Switching circuit 120
[0043] Control circuit 130
[0044] Switching tubes Q1, Q2
[0045] Current limiting resistors R1, R2
[0046] First switch circuit 121
[0047] Second switch circuit 122
[0048] Voltage detection circuit 140
[0049] Current detection circuit 150
[0050] Voltage conversion circuit 111
[0051] Filter circuit 112
[0052] Vehicle 10
[0053] Load 200
[0054] First load 210
[0055] Second load 220
[0056] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0057] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Illustrated in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. Like reference numerals represent identical or similar components.
[0058] The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. In addition, when used herein, "includes" and / or "comprising" and / or "having" integers, steps, operations, components and / or components do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.
[0059] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the context of this application, and will not be interpreted as idealized or overly formal meanings.
[0060] The following describes exemplary embodiments with reference to the accompanying drawings. It should be noted that the components depicted in the accompanying drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.
[0061] Reference Figure 1 The present application proposes a power supply circuit 100 for use in a vehicle 10, wherein the vehicle 10 includes multiple loads 200. The power supply circuit 100 includes a power supply circuit 110, multiple switch circuits 120, and a control circuit 130. The input end of the power supply circuit 110 is used to receive a power supply voltage, and the power supply circuit 110 is used to convert the power supply voltage into an operating voltage and output it. The first ends of the multiple switch circuits 120 are electrically connected to the output end of the power supply circuit 110, the second ends of the multiple switch circuits 120 are used to be electrically connected to the multiple loads 200 in a one-to-one correspondence, and the third ends of the multiple switch circuits 120 are used to receive control signals. The control circuit 130 is electrically connected to the third ends of the multiple switch circuits 120 respectively; the control circuit 130 is used to receive a trigger signal and generate a control signal with a corresponding duty cycle based on the trigger signal. The multiple switch circuits 120 are used to open / close the path between the corresponding first end and the second end based on the control signal with the corresponding duty cycle, and output an operating voltage with a corresponding current magnitude.
[0062] In this embodiment, the load 200 may be a vehicle-mounted lamp, fan, air conditioner, etc. The power supply circuit 110 can step up or down the power supply voltage, converting the power supply voltage into a suitable operating voltage output. The switch circuit 120 then turns on / off based on the control signal to form a preset current that is transmitted to the corresponding load 200 for power supply. Figure 2FIG. 1 is a structural diagram of a power supply circuit 110 in an embodiment of the present application.
[0063] For example, there are three switch circuits 120, each electrically connected to the headlights, turn signals, and air conditioner of the vehicle 10. The three switch circuits 120 are respectively a headlight switch circuit, a turn signal switch circuit, and an air conditioner switch circuit. When the headlights need to be turned on, a user triggers a headlight button to output a headlight trigger signal. The control circuit 130 generates a control signal having a third duty cycle based on the headlight trigger signal and outputs it to the headlight switch circuit. This control signal controls the headlight switch circuit to output an operating voltage having a third preset current to power the headlights, thereby keeping the headlights constantly on. When the turn signal is turned on, the user triggers the turn signal button. The control circuit 130 generates a control signal with a fourth duty cycle based on the turn signal trigger signal and outputs it to the turn signal switch circuit. This controls the turn signal switch circuit to conduct at preset intervals. During the on-time period, the turn signal switch circuit outputs an operating voltage with a fourth preset current to the turn signal power supply, illuminating the turn signal. During the preset interval, the turn signal switch circuit turns off, de-energizing the turn signal, thereby achieving intermittent on-off switching of the turn signal. When the air conditioner is turned on, the user triggers the air conditioner button and outputs an air conditioner trigger signal. The control circuit 130 generates a control signal with a fifth duty cycle based on the air conditioner trigger signal and outputs it to the air conditioner switch circuit. This controls the air conditioner switch circuit to output an operating voltage with a fifth preset current to the air conditioner power supply, activating the air conditioner. If the vehicle interior temperature reaches a set temperature, the control circuit 130 can also output a corresponding control signal to control the air conditioner switch circuit to de-energize, de-energizing the air conditioner. The first preset current, the second preset current, and the third preset current can be set to be the same or different depending on the operating current of the corresponding load 200. In this way, one power supply circuit 110 and three switch circuits 120 can be used to supply power to three loads 200 respectively, and the three power supplies do not affect each other.
[0064] The control signal can be a PWM signal. By setting the control signal to a PWM signal with a preset duty cycle, the switching tube can be controlled to periodically turn on and off, thereby controlling the switching tube to output a preset current according to the operating voltage. In this way, the control circuit 130 can output control signals with different duty cycles according to different loads 200 to control different switching circuits 120 to output operating voltages with corresponding currents, thereby meeting the operating current requirements of different loads 200. For example, the headlights of vehicle 10 require higher brightness. The control circuit 130 can output a control signal with a higher duty cycle to control the operating voltage output by the switching tube to the headlights to have a higher current to achieve the corresponding brightness.
[0065] The control circuit 130 can be implemented using a chip with control functionality, such as a microprocessor or FPGA. Alternatively, the control circuit 130 can be a body controller or domain controller in the vehicle 10. For example, to turn on the headlights, a user can trigger a headlight button to output a headlight trigger signal to the body controller. The body controller then outputs a control signal with a third duty cycle to the headlight switch circuit 120 to turn on the headlight switch, thereby supplying power to the headlights and illuminating them.
[0066] The present application uses a power supply circuit 110 to output an operating voltage, and a control circuit 130 to control the on / off switching of multiple switch circuits 120 based on a trigger signal to meet the operating current requirements of different loads 200, thereby enabling one power supply circuit 110 to power multiple loads 200, thereby reducing the number of power supply circuits 110, reducing circuit size and cost, and improving the utilization of the power supply circuit 110. In addition, the power supply circuit 100 of the present application can be implemented by adding multiple switch circuits 120 to the existing power supply circuit 110, reducing the cost of redeveloping and designing the power supply circuit 100.
[0067] Reference Figure 3 In one embodiment, the switching circuit 120 includes a switching tube. The first end of the switching tube is electrically connected to the output end of the power supply circuit 110, the second end of the switching tube is used to be electrically connected to the load 200, and the third end of the switching tube is used to receive a control signal. The switching tube is used to turn on / off with a preset duty cycle based on the control of the control signal and output an operating voltage with a corresponding current magnitude. The switching tube can be implemented by a MOS tube, a triode, etc. The number of switching tubes can be set to one or more according to actual needs.
[0068] Reference Figure 4 In one embodiment, the switching circuit 120 further includes a current-limiting resistor. A first end of the current-limiting resistor is electrically connected to a second end of the switching transistor, and the second end of the current-limiting resistor is electrically connected to the load 200. The switching transistor is configured to be turned on / off based on the control signal; the second end of the current-limiting resistor is configured to output an operating voltage corresponding to the current; the current-limiting resistors in the multiple switching circuits 120 have different resistance values.
[0069] In this embodiment, the control circuit 130 can output a control signal to control the conduction of the switch tube, and then limit the output current of the switch tube through the current-limiting resistor, thereby meeting the operating current requirement of the load 200. The resistance value of the current-limiting resistor can be determined according to the operating current of the load 200. The number of current-limiting resistors can be determined according to the actual application, and multiple current-limiting resistors can be connected in series and / or in parallel to achieve a corresponding resistance value.
[0070] Reference Figure 3 and Figure 4 In one embodiment, the power supply circuit 100 includes a first switch circuit 121 and a second switch circuit 122; the vehicle 10 includes a first load 210 and a second load 220. A first end of the first switch circuit 121 is electrically connected to the output end of the power supply circuit 110, a second end of the first switch circuit 121 is electrically connected to the first load 210, and a third end of the first switch circuit 121 is electrically connected to the control circuit 130. A first end of the second switch circuit 122 is electrically connected to the output end of the power supply circuit 110, a second end of the second switch circuit 122 is electrically connected to the second load 220, and a third end of the second switch circuit 122 is electrically connected to the control circuit 130. The control circuit 130 is used to output a first control signal with a first duty cycle based on a first trigger signal; the first switch circuit 121 is used to be turned on / off based on the control of the first control signal, and output an operating voltage with a first preset current; the control circuit 130 is used to output a second control signal with a second duty cycle based on a second trigger signal; the second switch circuit 122 is used to be turned on / off based on the control of the second control signal, and output an operating voltage with a second preset current; the magnitude of the first preset current is different from the magnitude of the second preset current.
[0071] In this embodiment, the first control signal can control the first switch circuit 121 to be turned on and off according to a first preset duty cycle to adjust the current of the operating voltage to the first preset current; alternatively, the first control signal can control the switch transistor Q1 in the first switch circuit 121 to transmit the operating voltage and output the operating voltage having the first preset current after current limiting via the current-limiting resistor R1 in the first switch circuit 121. The second control signal can control the second switch circuit 122 to be turned on and off according to a second preset duty cycle to adjust the current of the operating voltage to the second preset current; alternatively, the second control signal can control the switch transistor Q2 in the second switch circuit 122 to transmit the operating voltage and output the operating voltage having the second preset current after current limiting via the current-limiting resistor R2 in the second switch circuit 122.
[0072] The first preset current can be set according to the operating current of the first load 210, and the second preset current can be set according to the operating current of the second load 220. In this way, after the operating voltage output by the power supply circuit 110 passes through the first switch circuit 121 and the second switch circuit 122, it can form an operating voltage with the first preset current and an operating voltage with the second preset current, thereby realizing power supply to loads 200 with different operating currents.
[0073] In one embodiment, the first load 210 includes a daytime running light, and the second load 220 includes a turn signal light.
[0074] In this embodiment, the daytime running lights need to be constantly illuminated during activation. Therefore, during the activation process, the control circuit 130 can output a first control signal to control the first switch circuit 121 to remain conductive, thereby continuously powering the daytime running lights and keeping them illuminated. The turn signals need to be intermittently illuminated during activation. During this process, the control circuit 130 can output a second control signal to control the second switch circuit 122 to be conductive at preset intervals, thereby intermittently powering the turn signals and controlling their intermittent on / off. In this way, separate power supply for the daytime running lights and turn signals can be achieved using a single power supply circuit 110 and two switch circuits 120, reducing the number of power supply circuits 110.
[0075] Reference Figure 5 In one embodiment, the power supply circuit 100 further includes a voltage detection circuit 140. The voltage detection circuit 140 has multiple voltage detection terminals, each of which is electrically connected to the third terminals of the multiple switch circuits 120 in a one-to-one correspondence. The voltage detection circuit 140 is configured to detect the output voltages of the multiple switch circuits 120 and output an abnormality signal when the detected voltage is outside a preset voltage range. The control circuit 130 is configured to control the corresponding switch circuit 120 to disconnect based on the abnormality signal.
[0076] In this embodiment, the voltage detection circuit 140 can be implemented using a voltage-dividing resistor. The voltage detection circuit 140 detects the output voltages of the multiple switch circuits 120, allowing for timely adjustment or disconnection of the corresponding switch circuits 120 when the output voltages of the switch circuits 120 are abnormal. For example, during a power-on self-test of the vehicle 10, if the voltage detection circuit 140 detects that the voltage output from the second switch circuit 122 to the turn signal lamp is excessive or insufficient, the circuit outputs an abnormality signal to the vehicle body controller. The controller can then immediately disconnect the second switch circuit 122 and report a fault.
[0077] In one embodiment, the power supply circuit 100 further includes a current detection circuit 150. The current detection circuit 150 has multiple current detection terminals, each of which is electrically connected to the third terminals of the multiple switch circuits 120 in a one-to-one correspondence. The current detection circuit 150 is configured to detect the output current of the multiple switch circuits 120 and output an abnormality signal when the detected current is outside a preset current range. The control circuit 130 is configured to control the corresponding switch circuit 120 to disconnect based on the abnormality signal.
[0078] In this embodiment, the current detection circuit 150 can be implemented using a detection resistor or a current detection chip. The current detection circuit 150 detects the output current of the multiple switch circuits 120, allowing for timely adjustment or disconnection of the corresponding switch circuit 120 when the output current of the switch circuit 120 is abnormal. For example, during a power-on self-test of the vehicle 10, if the current detection circuit 150 detects that the current output from the second switch circuit 122 to the turn signal lamp is excessive or insufficient, it outputs an abnormality signal to the vehicle body controller. The vehicle body controller can then immediately disconnect the second switch circuit 122 and report a fault.
[0079] Reference Figure 6 In one embodiment, the power supply circuit 110 includes a voltage conversion circuit 111. The voltage conversion circuit 111 is used to convert the power supply voltage into an operating voltage and output the operating voltage.
[0080] In this embodiment, the voltage conversion circuit 111 can be implemented by a boost circuit and / or a buck circuit. The power supply voltage can be the voltage output by the battery pack of the vehicle 10, or the voltage output by the body controller / domain controller.
[0081] In one embodiment, the power supply circuit 110 further includes a filter circuit 112. The filter circuit 112 can be implemented by capacitors, resistors, etc. The filter circuit 112 is used to filter and output the operating voltage to improve the stability of the operating voltage.
[0082] Reference Figure 1 This application also provides a vehicle 10, comprising a plurality of loads 200 and the aforementioned power supply circuit 100. The vehicle 10 may be an electric vehicle or a hybrid vehicle. The loads 200 may be electrical devices such as lights, air conditioners, fans, and controllers.
[0083] The detailed structure of the power supply circuit 100 can be referred to the above-mentioned embodiment and will not be repeated here. It can be understood that since the above-mentioned power supply circuit 100 is used in the vehicle 10 of the present application, the embodiment of the vehicle 10 of the present application includes all technical solutions of all embodiments of the above-mentioned power supply circuit 100, and the technical effects achieved are also exactly the same, which will not be repeated here.
[0084] The specific embodiments of the present application have been described above with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications and substitutions may be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. Such modifications and substitutions are intended to fall within the scope of the present application.
Claims
1. A power supply circuit, applied to a vehicle, wherein the vehicle includes a plurality of loads; characterized in that: The power supply circuit includes: A power supply circuit, wherein the input end of the power supply circuit is used to receive a power supply voltage, and the power supply circuit is used to convert the power supply voltage into an operating voltage and output the operating voltage; a plurality of switch circuits, wherein first ends of the plurality of switch circuits are electrically connected to the output end of the power supply circuit, second ends of the plurality of switch circuits are used to be electrically connected to the plurality of loads in a one-to-one correspondence, and third ends of the plurality of switch circuits are used to receive control signals; a control circuit, the control circuit being electrically connected to the third terminals of the plurality of switch circuits respectively; the control circuit being configured to receive a trigger signal and generate a control signal having a corresponding duty cycle based on the trigger signal; The plurality of switch circuits are used to switch on / off the path between the corresponding first end and the second end based on the control of a control signal with a corresponding duty cycle, and output an operating voltage with a corresponding current.
2. The power supply circuit according to claim 1, wherein: The switching circuit includes a switching tube; The first end of the switch tube is electrically connected to the output end of the power supply circuit, the second end of the switch tube is used to be electrically connected to the load, and the third end of the switch tube is used to receive a control signal; The switch tube is used to be turned on / off based on the control of the control signal and output an operating voltage with a corresponding current.
3. The power supply circuit according to claim 2, wherein: The switching circuit further includes a current limiting resistor; The first end of the current limiting resistor is electrically connected to the second end of the switch tube, and the second end of the current limiting resistor is used to be electrically connected to the load; The switch tube is used to be turned on / off based on the control of the control signal; the second end of the current limiting resistor is used to output a working voltage with a corresponding current; the resistance values of the current limiting resistors of the multiple switch circuits are different.
4. The power supply circuit according to any one of claims 1 to 3, characterized in that: The power supply circuit includes a first switch circuit and a second switch circuit; the vehicle includes a first load and a second load; A first end of the first switch circuit is electrically connected to the output end of the power supply circuit, a second end of the first switch circuit is used to be electrically connected to the first load, and a third end of the first switch circuit is electrically connected to the control circuit; A first end of the second switch circuit is electrically connected to the output end of the power supply circuit, a second end of the second switch circuit is used to be electrically connected to the second load, and a third end of the second switch circuit is electrically connected to the control circuit; The control circuit is configured to output a first control signal having a first duty cycle based on a first trigger signal; The first switch circuit is configured to be turned on / off based on the control of the first control signal and output an operating voltage having a first preset current; the control circuit is configured to output a second control signal having a second duty cycle based on the second trigger signal; The second switch circuit is used to be turned on / off based on the control of the second control signal and output an operating voltage with a second preset current; the magnitude of the first preset current is different from the magnitude of the second preset current.
5. The power supply circuit according to claim 4, wherein: The first load includes a daytime running light, and the second load includes a turn signal light.
6. The power supply circuit according to claim 1, wherein: The power supply circuit also includes a voltage detection circuit; The voltage detection circuit has a plurality of voltage detection terminals, each of which is electrically connected to the third terminals of the plurality of switch circuits in a one-to-one correspondence; the voltage detection circuit is used to detect the output voltage of the plurality of switch circuits and output an abnormality signal when the detected voltage is outside a preset voltage range; The control circuit is used to control the corresponding switch circuit to be disconnected based on the abnormal signal.
7. The power supply circuit according to claim 1, wherein: The power supply circuit also includes a current detection circuit; The current detection circuit has a plurality of current detection terminals, and the plurality of current detection terminals are electrically connected to the third terminals of the plurality of switch circuits in a one-to-one correspondence; The current detection circuit is used to detect the output current of the plurality of switch circuits and output an abnormal signal when the detected current is outside a preset current range; The control circuit is used to control the corresponding switch circuit to be disconnected based on the abnormal signal.
8. The power supply circuit according to claim 1, wherein: The power supply circuit includes a voltage conversion circuit; The voltage conversion circuit is used to convert the power supply voltage into an operating voltage and output the operating voltage.
9. The power supply circuit according to claim 8, wherein: The power supply circuit further includes a filter circuit; The filtering circuit is used to filter the operating voltage.
10. A vehicle, characterized in that: The vehicle comprises a plurality of loads and a power supply circuit according to any one of claims 1 to 9; The power supply circuit is used to supply power to the plurality of loads.