Power supply circuit and electronic equipment

Abstract

The invention provides a power supply circuit and electronic equipment. The power supply circuit comprises a power input end, a load output end, a first switching circuit, a second switching circuit, a third switching component and a control circuit. The first switch circuit comprises a first switch part, and the output end of the first switch part is electrically connected with the load output end. The second switch circuit comprises a second switch part, and the output end of the second switch part is electrically connected with the load output end. The control circuit is used for controlling the second switch part and the first switch part to be switched on when receiving a power-on instruction, and controlling the third switch part to be switched on when the first switch part or the second switch part breaks down. According to the application, the control circuit controls the third switch component to be switched on when the first switch component or the second switch component fails, the failed switch component is taken over to work, and the control circuit can still control power transmission between the power supply and the load, so that the fault risk caused by power transmission is reduced, and the reliability and the safety are improved.

Description

Technical Field

[0001] The present application relates to the field of power transmission, and in particular to a power supply circuit and electronic equipment. Background Art

[0002] High voltage relays are usually used to control the switching of high voltage circuits, such as those in charging piles, energy storage devices, electric vehicles, etc. The main function of high voltage relays is to open or close high voltage circuits when needed in order to achieve the transmission, distribution and control of electrical energy. They can be manipulated by low voltage signals or control signals to achieve precise control of high voltage circuits.

[0003] However, due to circuit short circuit, welding problem or relay aging, the high-voltage relay may fail, and the equipment needs to be interrupted for maintenance. It is also possible that the high-voltage relay cannot complete the high-voltage power-on due to failure, increasing the risk of equipment failure and shutdown. Summary of the invention

[0004] In order to solve the problems in the prior art, the present application provides a power supply circuit and an electronic device.

[0005] The present application provides a power supply circuit, the power supply circuit comprising:

[0006] A power input terminal, including a positive input terminal and a negative input terminal, for connecting to a power source;

[0007] A load output terminal, used for being electrically connected to a load;

[0008] A first switch circuit comprises a first switch component; an input end of the first switch component is electrically connected to a positive input end of the power input end, and an output end of the first switch component is electrically connected to an output end of the load;

[0009] A second switch circuit comprises a second switch component; an input end of the second switch component is electrically connected to a negative input end of the power input end, and an output end of the second switch component is electrically connected to the load output end;

[0010] a third switch component, connected in parallel with the first switch component or the second switch component;

[0011] A control circuit is electrically connected to the first switch component, the second switch component and the third switch component respectively; the control circuit is used to control the second switch component and the first switch component to be turned on when a power-on instruction is received to power on the load; and, when the first switch component or the second switch component fails, control the third switch component to be turned on.

[0012] In one embodiment, the number of the third switch components is two, and the two third switch components are respectively connected in parallel with the first switch component and the second switch component.

[0013] In one embodiment, when the third switch component is connected in parallel with the first switch component, the first switch circuit further comprises a fourth switch component; the input end of the fourth switch component is electrically connected to the output end of the first switch component, and the output end of the fourth switch component is electrically connected to the load output end; the control circuit is further configured to control the fourth switch component to be turned on when receiving the power-on instruction; and control the fourth switch component to be turned off when the first switch component fails;

[0014] When the third switch component is connected in parallel with the second switch component, the second switch circuit also includes a fifth switch component; the input end of the fifth switch component is electrically connected to the output end of the second switch component, and the output end of the fifth switch component is electrically connected to the load output end; the control circuit is also used to control the fifth switch component to be turned on when receiving the power-on instruction; and, when the second switch component fails, control the fifth switch component to be turned off.

[0015] In one embodiment, the control circuit is further used to obtain the input voltage and output voltage of the first switch component and calculate the first difference between the input voltage and the output voltage of the first switch component after the load is powered on; and / or obtain the input voltage and output voltage of the second switch component and calculate the second difference between the input voltage and the output voltage of the second switch component;

[0016] The control circuit is further configured to determine that the first switch component is faulty when the first difference is greater than a first preset range; and to determine that the second switch component is faulty when the second difference is greater than a second preset range.

[0017] In one embodiment, the power supply circuit further includes a voltage detection circuit;

[0018] The voltage detection circuit is electrically connected to the control circuit, and the voltage detection circuit is used to detect the input voltage and output voltage of the first switch component and / or detect the input voltage and output voltage of the second switch component.

[0019] In one embodiment, the power supply circuit further includes a pre-charging circuit;

[0020] The pre-charging circuit is connected in parallel with the first switch circuit;

[0021] The control circuit is used to control the second switch component to be turned on when receiving a power-on instruction, and to control the pre-charging circuit to be turned on for a first preset time to output a pre-charging voltage to the load; and, after the first preset time ends, control the first switch component to be turned on, and control the pre-charging circuit to be disconnected.

[0022] In one embodiment, the pre-charging circuit includes a first resistor and a sixth switch component;

[0023] The first end of the first resistor is electrically connected to the positive input end of the power input end, the second end of the first resistor is electrically connected to the input end of the sixth switch component, and the output end of the sixth switch component is electrically connected to the load output end;

[0024] The control circuit is used to control the second switch component to be turned on and the sixth switch component to be turned on for the first preset time period when receiving a power-on instruction; and, after the first preset time period ends, control the sixth switch component to be turned off and the first switch component to be turned on.

[0025] In one embodiment, the third switch component is connected in parallel with any one of the first switch component, the second switch component and the sixth switch component.

[0026] In one embodiment, there are multiple third switch components, and the multiple third switch components are respectively connected in parallel with any two or all of the first switch component, the second switch component and the sixth switch component.

[0027] In one embodiment, when the third switch component is connected in parallel with the first switch component, the first switch circuit further comprises a fourth switch component; the input end of the fourth switch component is electrically connected to the output end of the first switch component, and the output end of the fourth switch component is electrically connected to the load output end; the control circuit is further configured to control the fourth switch component to be turned on when receiving the power-on instruction; and control the fourth switch component to be turned off when the first switch component fails;

[0028] In the case where the third switch component is connected in parallel with the second switch component, the second switch circuit further comprises a fifth switch component; the input end of the fifth switch component is electrically connected to the output end of the second switch component, and the output end of the fifth switch component is electrically connected to the load output end; the control circuit is further used to control the fifth switch component to be turned on when receiving the power-on instruction; and, when the second switch component fails, control the fifth switch component to be turned off;

[0029] When the third switch component is connected in parallel with the sixth switch component, the pre-charging circuit also includes a seventh switch component; the input end of the seventh switch component is electrically connected to the output end of the sixth switch component, and the output end of the seventh switch component is electrically connected to the load output end; the control circuit is also used to control the seventh switch component to be turned on when receiving the power-on instruction; and, when the sixth switch component fails, control the seventh switch component to be turned off.

[0030] In one embodiment, the control circuit is further configured to control the first switch component and the second switch component to be disconnected when receiving a power-off instruction, so as to power off the load;

[0031] The control circuit is further used to obtain the output voltage of the first switch component, and / or to obtain the output voltage of the second switch component;

[0032] The control circuit is further configured to determine that the first switch component is faulty when the output voltage of the first switch component is not zero; and / or to determine that the second switch component is faulty when the output voltage of the second switch component is not zero.

[0033] The present application also proposes an electronic device, comprising a battery pack and the above-mentioned power supply circuit, wherein the battery pack is electrically connected to the power supply circuit, and the power supply circuit is used to transmit the voltage of the battery pack to one or more loads.

[0034] The present application controls the third switch component to conduct when the first switch component or the second switch component fails through a control circuit, taking over the operation of the failed switch component, and ensuring that the control circuit can still control the power transmission between the power supply and the load, thereby reducing the risk of failure caused by power transmission and improving reliability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a module structure diagram of a power supply circuit according to an embodiment of the present application.

[0036] Figure 2 FIG. 4 is a circuit structure diagram of a power supply circuit according to an embodiment of the present application.

[0037] Figure 3 This is a circuit structure diagram of a power supply circuit according to another embodiment of the present application.

[0038] Figure 4 This is a circuit structure diagram of a power supply circuit according to another embodiment of the present application.

[0039] Figure 5 This is a module structure diagram of an electronic device according to an embodiment of the present application.

[0040] Main component symbols

[0041] Power supply circuit 100 Power supply input terminal 110

[0042] Load output terminal 120 First switch circuit 130

[0043] Second switch circuit 140 First switch component Q1

[0044] The second switch component Q2 The third switch component Q3

[0045] Fourth switch component Q4 Fifth switch component Q5

[0046] Sixth switch component Q6 Control circuit 150

[0047] Seventh switch component Q7 Voltage detection circuit 160

[0048] Precharge circuit 170 First resistor R1

[0049] Battery pack 200 Electronic device 10

[0050] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0051] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown 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 being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0052] Reference Figure 1 and Figure 2The present application proposes a power supply circuit 100, which includes a power supply input terminal 110, a load output terminal 120, a first switch circuit 130, a second switch circuit 140, a third switch component Q3 and a control circuit 150. The power supply input terminal 110 includes a positive input terminal and a negative input terminal for connecting to a power supply. The load output terminal 120 is used to be electrically connected to a load. The first switch circuit 130 includes a first switch component Q1; the input terminal of the first switch component Q1 is electrically connected to the positive input terminal of the power supply input terminal 110, and the output terminal of the first switch component Q1 is electrically connected to the load output terminal 120. The second switch circuit 140 includes a second switch component Q2; the input terminal of the second switch component Q2 is electrically connected to the negative input terminal of the power supply input terminal 110, and the output terminal of the second switch component Q2 is electrically connected to the load output terminal 120. The third switch component Q3 is connected in parallel with the first switch component Q1 or the second switch component Q2. The control circuit 150 is electrically connected to the first switch component Q1, the second switch component Q2 and the third switch component Q3 respectively; the control circuit 150 is used to control the second switch component Q2 and the first switch component Q1 to be turned on to power on the load when a power-on instruction is received; and to control the third switch component Q3 to be turned on when the first switch component Q1 or the second switch component Q2 fails.

[0053] In this embodiment, the power supply circuit 100 can be applied to electronic devices 10 such as electric vehicles and charging piles. The power supply connected to the power input terminal 110 can be a battery pack 200 or a grid power supply. The load of the load output terminal 120 can be various controllers, communication circuits, execution systems, battery packs 200 and other electrical devices. Taking an electric vehicle as an example, the power input terminal 110 of the power supply circuit 100 is electrically connected to the battery pack 200 of the electric vehicle, and the load output terminal 120 of the electric vehicle can be electrically connected to the motor controller. Initially, the third switch component Q3 remains in a disconnected state. When the electric vehicle starts, the vehicle controller of the electric vehicle outputs a power-on instruction, and the control circuit 150 outputs the main negative control signal and the main positive control signal in sequence according to the power-on instruction to control the second switch component Q2 and the first switch component Q1 to be turned on in sequence, and the voltage of the battery pack 200 is transmitted to the motor controller to realize the power-on of the motor controller. Among them, the main negative control signal can be a high / low level, and the main positive control signal can be a high / low level.

[0054] After power-on is completed, if the first switch component Q1 or the second switch component Q2 connected in parallel with the third switch component Q3 fails (such as a circuit breaker failure or an aging failure, etc.), the voltage of the battery pack 200 cannot be normally transmitted to the motor controller, which may affect the normal operation of the motor controller and even cause the electric vehicle to fail or stop working. At this time, the control circuit 150 can output the main positive control signal or the main negative control signal to the third switch component Q3 to control the third switch component Q3 to conduct, replace the faulty switch component to achieve power transmission, ensure that the voltage of the battery pack 200 can be normally transmitted to the motor controller, and avoid the motor controller from failing to work normally due to abnormal power transmission, thereby avoiding accidents caused by sudden failures after the electric vehicle is started, and improving the safety of the electric vehicle. Among them, the control circuit 150 can be integrated into the power management circuit of the electric vehicle, or it can be implemented by a chip with control function such as a microprocessor or FPGA. The first switch component Q1, the second switch component Q2 and the third switch component Q3 can be selected from relays. In this way, it can not only achieve rapid closing and disconnection under high voltage, but also play an isolation role between the power supply and the load. Alternatively, the first switch component Q1, the second switch component Q2 and the third switch component Q3 may be field effect transistors.

[0055] Similarly, when the power supply circuit 100 is applied to a charging pile, the power input terminal 110 of the power supply circuit 100 can be connected to the grid power supply, and the load output terminal 120 of the power supply circuit 100 can be electrically connected to the power device. Alternatively, the power input terminal 110 of the power supply circuit 100 can be connected to the power device, and the load output terminal 120 of the power supply circuit 100 can be electrically connected to the powered device. When the power supply circuit 100 is applied to a charging pile, the power-on principle and fault handling principle are the same as the power-on principle and fault handling principle of the above-mentioned power supply circuit 100 when applied to an electric vehicle, and will not be repeated here.

[0056] The present application controls the third switch component Q3 to turn on when the first switch component Q1 or the second switch component Q2 fails through the control circuit 150, taking over the operation of the failed switch component, ensuring that the control circuit 150 can still control the power transmission between the power supply and the load, thereby reducing the risk of failure caused by power transmission and improving reliability and safety.

[0057] Reference Figure 3 In one embodiment, the number of the third switch components Q3 is two, and the two third switch components Q3 are respectively connected in parallel with the first switch component Q1 and the second switch component Q2.

[0058] In this embodiment, two third switch components Q3 are respectively connected in parallel with the first switch component Q1 and the second switch component Q2. When any one of the first switch component Q1 and the second switch component Q2 fails, the control circuit 150 can control the corresponding third switch component Q3 to turn on, take over the failed switch component to continue working, and further improve the reliability and safety of the power supply circuit 100.

[0059] Reference Figure 4 In one embodiment, when the third switch component Q3 is connected in parallel with the first switch component Q1, the first switch circuit 130 further includes a fourth switch component Q4; the input end of the fourth switch component Q4 is electrically connected to the output end of the first switch component Q1, and the output end of the fourth switch component Q4 is electrically connected to the load output end 120; the control circuit 150 is further used to control the fourth switch component Q4 to be turned on when receiving a power-on instruction; and, in the case of a failure of the first switch component Q1, control the fourth switch component Q4 to be turned off. When the third switch component Q3 is connected in parallel with the second switch component Q2, the second switch circuit 140 further includes a fifth switch component Q5; the input end of the fifth switch component Q5 is electrically connected to the output end of the second switch component Q2, and the output end of the fifth switch component Q5 is electrically connected to the load output end 120; the control circuit 150 is further used to control the fifth switch component Q5 to be turned on when receiving a power-on instruction; and, in the case of a failure of the second switch component Q2, control the fifth switch component Q5 to be turned off.

[0060] In this embodiment, the fourth switch component Q4 is connected in series with the first switch component Q1. When the first switch component Q1 is working normally, the fourth switch component Q4 is turned on, which does not affect power transmission. When the first switch component Q1 fails, the control circuit 150 controls the fourth switch component Q4 to be turned off, thereby disconnecting the first switch component Q1 from the power transmission circuit, so that the corresponding third switch component Q3 can be unaffected by the first switch component Q1 and independently control the path between the positive input terminal of the power input terminal 110 and the load.

[0061] Similarly, by connecting the fifth switch component Q5 in series with the second switch component Q2, when the second switch component Q2 is operating normally, the fifth switch component Q5 is turned on, and power transmission is not affected. When the second switch component Q2 fails, the control circuit 150 controls the fifth switch component Q5 to be disconnected, thereby disconnecting the second switch component Q2 from the power transmission circuit, so that the corresponding third switch component Q3 can be unaffected by the second switch component Q2 and independently control the path between the negative input terminal of the power input terminal 110 and the load.

[0062] In one embodiment, the control circuit 150 is further configured to obtain the input voltage and output voltage of the first switch component Q1 after the load is powered on, and calculate the first difference between the input voltage and output voltage of the first switch component Q1; and / or obtain the input voltage and output voltage of the second switch component Q2, and calculate the second difference between the input voltage and output voltage of the second switch component Q2. The control circuit 150 is further configured to determine that the first switch component Q1 is faulty when the first difference is greater than a first preset range; and determine that the second switch component Q2 is faulty when the second difference is greater than a second preset range.

[0063] In this embodiment, after the load is powered on, when the first switch component Q1 is normally turned on, its input voltage and output voltage should be roughly the same, that is, the first difference between the input voltage and the output voltage of the first switch component Q1 should be less than or equal to the first preset range. When the first switch component Q1 fails, such as a circuit breaker failure or an aging failure, resulting in the power supply voltage being unable to be normally transmitted to the load, the difference between the input voltage and the output voltage of the first switch component Q1 is large, that is, the first difference between the input voltage and the output voltage of the first switch component Q1 should be greater than the first preset range. At this time, the control circuit 150 controls the third switch component Q3 connected in parallel with the first switch component Q1 to turn on.

[0064] Similarly, if the second difference between the input voltage and the output voltage of the second switch component Q2 is greater than the second preset range, it indicates that the second switch component Q2 is faulty. At this time, the control circuit 150 controls the third switch component Q3 connected in parallel with the second switch component Q2 to turn on.

[0065] Among them, the first preset range and the second preset range can be determined according to the power supply voltage or the load operating voltage, which is not limited in the embodiment of the present application.

[0066] In one embodiment, the power supply circuit 100 further includes a voltage detection circuit 160. The voltage detection circuit 160 is electrically connected to the control circuit 150, and is used to detect the input voltage and output voltage of the first switch component Q1, and / or the input voltage and output voltage of the second switch component Q2. The voltage detection circuit 160 can be implemented by using a voltage divider resistor.

[0067] In one embodiment, the power supply circuit 100 further includes a pre-charging circuit 170. The pre-charging circuit 170 is connected in parallel with the first switch circuit 130. The control circuit 150 is used to control the second switch component Q2 to be turned on when receiving a power-on instruction, and control the pre-charging circuit 170 to be turned on for a first preset time length to output a pre-charging voltage to the load; and, after the first preset time length ends, control the first switch component Q1 to be turned on, and control the pre-charging circuit 170 to be turned off.

[0068] In this embodiment, when the control circuit 150 receives the power-on instruction, the pre-charging circuit 170 pre-charges the load to prevent the sudden access of the power supply voltage from impacting the load and damaging the load. The first preset time length can be determined according to the capacitance of the capacitive device in the load.

[0069] In one embodiment, the pre-charging circuit 170 includes a first resistor R1 and a sixth switch component Q6. The first end of the first resistor R1 is electrically connected to the positive input end of the power input end 110, the second end of the first resistor R1 is electrically connected to the input end of the sixth switch component Q6, and the output end of the sixth switch component Q6 is electrically connected to the load output end 120. The control circuit 150 is used to control the second switch component Q2 to be turned on when receiving a power-on instruction, and control the sixth switch component Q6 to be turned on according to a first preset time length; and after the first preset time length ends, control the sixth switch component Q6 to be turned off and the first switch component Q1 to be turned on.

[0070] In this embodiment, the input current is limited by the first resistor R1 so that the power current can slowly charge the capacitor in the load.

[0071] In one embodiment, the third switch component Q3 is connected in parallel with any one of the first switch component Q1 , the second switch component Q2 and the sixth switch component Q6 .

[0072] In this embodiment, the circuit structure of the third switch component Q3 can be determined according to actual application. For example, if the failure rate of the first switch component Q1 is high, or the first switch component Q1 is used frequently, the third switch component Q3 can be connected in parallel with the first switch component Q1.

[0073] By connecting the third switch component Q3 in parallel with any one of the first switch component Q1, the second switch component Q2 and the sixth switch component Q6, when the switch component connected in parallel with the third switch component Q3 fails, the control circuit 150 can control the third switch component Q3 to turn on, take over the failed switch component to continue working, and further improve the reliability and safety of the power supply circuit 100.

[0074] In one embodiment, there are multiple third switch components Q3, and the multiple third switch components Q3 are respectively connected in parallel with any two or all of the first switch component Q1, the second switch component Q2 and the sixth switch component Q6.

[0075] In this embodiment, the number and circuit structure of the third switch components Q3 can be determined according to actual applications. For example, if the failure rate of the first switch component Q1 and the second switch component Q2 is high, or the first switch component Q1 and the second switch component Q2 are used frequently, two third switch components Q3 can be set to be connected in parallel with the first switch component Q1 and the second switch component Q2.

[0076] Similarly, if the failure rate of the first switch component Q1, the second switch component Q2 and the sixth switch component Q6 is high, or the first switch component Q1, the second switch component Q2 and the sixth switch component Q6 are used frequently, three third switch components Q3 can be set to be connected in parallel with the first switch component Q1, the second switch component Q2 and the sixth switch component Q6. In this way, when any one of the first switch component Q1, the second switch component Q2 and the sixth switch component Q6 fails, the control circuit 150 can control the corresponding third switch component Q3 to be turned on, take over the failed switch component to continue working, and further improve the reliability and safety of the power supply circuit 100.

[0077] In one embodiment, when the third switch component Q3 is connected in parallel with the first switch component Q1, the first switch circuit 130 also includes a fourth switch component Q4; the input end of the fourth switch component Q4 is electrically connected to the output end of the first switch component Q1, and the output end of the fourth switch component Q4 is electrically connected to the load output end 120; the control circuit 150 is also used to control the fourth switch component Q4 to be turned on when receiving a power-on instruction; and, when the first switch component Q1 fails, control the fourth switch component Q4 to be turned off.

[0078] When the third switch component Q3 is connected in parallel with the second switch component Q2, the second switch circuit 140 also includes a fifth switch component Q5; the input end of the fifth switch component Q5 is electrically connected to the output end of the second switch component Q2, and the output end of the fifth switch component Q5 is electrically connected to the load output end 120; the control circuit 150 is also used to control the fifth switch component Q5 to be turned on when receiving a power-on instruction; and, when the second switch component Q2 fails, control the fifth switch component Q5 to be turned off.

[0079] When the third switch component Q3 is connected in parallel with the sixth switch component Q6, the pre-charging circuit 170 also includes a seventh switch component Q7; the input end of the seventh switch component Q7 is electrically connected to the output end of the sixth switch component Q6, and the output end of the seventh switch component Q7 is electrically connected to the load output end 120; the control circuit 150 is also used to control the seventh switch component Q7 to be turned on when receiving a power-on instruction; and, when the sixth switch component Q6 fails, control the seventh switch component Q7 to be turned off.

[0080] In this embodiment, the fourth switch component Q4 is connected in series with the first switch component Q1. When the first switch component Q1 is working normally, the fourth switch component Q4 is turned on, which does not affect power transmission. When the first switch component Q1 fails, the control circuit 150 controls the fourth switch component Q4 to be turned off, thereby disconnecting the first switch component Q1 from the power transmission circuit, so that the corresponding third switch component Q3 can be unaffected by the first switch component Q1 and independently control the path between the positive input terminal of the power input terminal 110 and the load.

[0081] Similarly, by connecting the fifth switch component Q5 in series with the second switch component Q2, when the second switch component Q2 is operating normally, the fifth switch component Q5 is turned on, and power transmission is not affected. When the second switch component Q2 fails, the control circuit 150 controls the fifth switch component Q5 to be disconnected, thereby disconnecting the second switch component Q2 from the power transmission circuit, so that the corresponding third switch component Q3 can be unaffected by the second switch component Q2 and independently control the path between the negative input terminal of the power input terminal 110 and the load.

[0082] Similarly, by connecting the seventh switch component Q7 in series with the sixth switch component Q6, when the sixth switch component Q6 is working normally, the seventh switch component Q7 is turned on, and power transmission is not affected. When the sixth switch component Q6 fails, the control circuit 150 controls the seventh switch component Q7 to be disconnected, thereby disconnecting the sixth switch component Q6 from the power transmission circuit, so that the corresponding third switch component Q3 can be unaffected by the sixth switch component Q6, and independently controls the path from the positive input terminal of the power input terminal 110 in the pre-charging circuit 170 to the load.

[0083] In one embodiment, the control circuit 150 is further configured to control the first switch component Q1 and the second switch component Q2 to be disconnected when receiving a power-off instruction, so as to power off the load. The control circuit 150 is further configured to obtain the output voltage of the first switch component Q1 and / or the output voltage of the second switch component Q2 after the load is powered off. The control circuit 150 is further configured to determine that the first switch component Q1 is faulty when the output voltage of the first switch component Q1 is not 0; and / or determine that the second switch component Q2 is faulty when the output voltage of the second switch component Q2 is not 0.

[0084] In this embodiment, the power-off instruction can be output by the vehicle controller of the electric vehicle. For example, when the electric vehicle stops running, the vehicle controller outputs the power-off instruction. The control circuit 150 controls the first switch component Q1 and the second switch component Q2 to be disconnected according to the power-off instruction. At this time, the power transmission circuit between the power supply and the load is disconnected, and the output voltage of the first switch component Q1 and the output voltage of the second switch component Q2 should both be 0. If the output voltage of the first switch component Q1 is not 0, it means that the first switch component Q1 may have a short circuit fault. At this time, the control circuit 150 controls the fourth switch component Q4 to be disconnected, that is, to disconnect the transmission circuit between the positive pole of the power supply and the load. If the output voltage of the second switch component Q2 is not 0, it means that the second switch component Q2 may have a short circuit fault. At this time, the control circuit 150 controls the fifth switch component Q5 to be disconnected, that is, to disconnect the transmission circuit between the negative pole of the power supply and the load.

[0085] Reference Figure 5The present application also proposes an electronic device 10, including a battery pack 200 and the above-mentioned power supply circuit 100, wherein the battery pack 200 is electrically connected to the power supply circuit 100, and the power supply circuit 100 is used to transmit the voltage of the battery pack 200 to one or more loads. The electronic device 10 may be an electric vehicle, a charging pile, an energy storage device, etc. The load may be various controllers, communication circuits, execution systems, and other electrical devices.

[0086] The detailed structure of the power supply circuit 100 can be referred to the above-mentioned embodiment, which will not be described in detail here; it can be understood that since the above-mentioned power supply circuit 100 is used in the electronic device 10 of the present application, the embodiment of the electronic device 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 described in detail here.

[0087] In the above, the specific implementation of the present application is described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific implementation of the present application without departing from the spirit and scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A power supply circuit, It is characterized in that The power supply circuit comprises: A power input terminal, including a positive input terminal and a negative input terminal, for connecting to a power source; A load output terminal, used for being electrically connected to a load; A first switch circuit comprises a first switch component; an input end of the first switch component is electrically connected to a positive input end of the power input end, and an output end of the first switch component is electrically connected to an output end of the load; A second switch circuit comprises a second switch component; an input end of the second switch component is electrically connected to a negative input end of the power input end, and an output end of the second switch component is electrically connected to the load output end; a third switch component, connected in parallel with the first switch component or the second switch component; A control circuit is electrically connected to the first switch component, the second switch component and the third switch component respectively; the control circuit is used to control the second switch component and the first switch component to be turned on when a power-on instruction is received to power on the load; and, when the first switch component or the second switch component fails, control the third switch component to be turned on.

2. The power supply circuit according to claim 1, It is characterized in that The number of the third switch components is two, and the two third switch components are connected in parallel with the first switch component and the second switch component respectively.

3. The power supply circuit according to claim 1 or 2, It is characterized in that In the case where the third switch component is connected in parallel with the first switch component, the first switch circuit further comprises a fourth switch component; an input end of the fourth switch component is electrically connected to an output end of the first switch component, and an output end of the fourth switch component is electrically connected to an output end of the load; the control circuit is further configured to control the fourth switch component to be turned on when receiving the power-on instruction; and, when the first switch component fails, control the fourth switch component to be turned off; When the third switch component is connected in parallel with the second switch component, the second switch circuit also includes a fifth switch component; the input end of the fifth switch component is electrically connected to the output end of the second switch component, and the output end of the fifth switch component is electrically connected to the load output end; the control circuit is also used to control the fifth switch component to be turned on when receiving the power-on instruction; and, when the second switch component fails, control the fifth switch component to be turned off.

4. The power supply circuit according to claim 1, It is characterized in that The control circuit is further used to obtain the input voltage and the output voltage of the first switch component after the load is powered on, and calculate a first difference between the input voltage and the output voltage of the first switch component; and / or, obtaining an input voltage and an output voltage of the second switch component, and calculating a second difference between the input voltage and the output voltage of the second switch component; The control circuit is further configured to determine that the first switch component is faulty when the first difference is greater than a first preset range; and to determine that the second switch component is faulty when the second difference is greater than a second preset range.

5. The power supply circuit according to claim 4, It is characterized in that The power supply circuit also includes a voltage detection circuit; The voltage detection circuit is electrically connected to the control circuit, and the voltage detection circuit is used to detect the input voltage and output voltage of the first switch component and / or detect the input voltage and output voltage of the second switch component.

6. The power supply circuit according to claim 1, It is characterized in that The power supply circuit also includes a pre-charging circuit; The pre-charging circuit is connected in parallel with the first switch circuit; The control circuit is used to control the second switch component to be turned on when receiving the power-on instruction, and to control the pre-charging circuit to be turned on for a first preset time to output the pre-charging voltage to the load; and, after the first preset time ends, control the first switch component to be turned on, and control the pre-charging circuit to be disconnected.

7. The power supply circuit according to claim 6, It is characterized in that The pre-charging circuit comprises a first resistor and a sixth switch component; The first end of the first resistor is electrically connected to the positive input end of the power input end, the second end of the first resistor is electrically connected to the input end of the sixth switch component, and the output end of the sixth switch component is electrically connected to the load output end; The control circuit is used to control the second switch component to be turned on and the sixth switch component to be turned on for the first preset time period when receiving the power-on instruction; and, after the first preset time period ends, control the sixth switch component to be turned off and the first switch component to be turned on.

8. The power supply circuit according to claim 7, It is characterized in that The third switch component is connected in parallel with any one of the first switch component, the second switch component and the sixth switch component.

9. The power supply circuit according to claim 7, It is characterized in that There are multiple third switch components, and the multiple third switch components are respectively connected in parallel with any two or all of the first switch component, the second switch component and the sixth switch component.

10. The power supply circuit according to claim 8 or 9, It is characterized in that In the case where the third switch component is connected in parallel with the first switch component, the first switch circuit further comprises a fourth switch component; an input end of the fourth switch component is electrically connected to an output end of the first switch component, and an output end of the fourth switch component is electrically connected to an output end of the load; the control circuit is further configured to control the fourth switch component to be turned on when receiving the power-on instruction; and, when the first switch component fails, control the fourth switch component to be turned off; In the case where the third switch component is connected in parallel with the second switch component, the second switch circuit further comprises a fifth switch component; the input end of the fifth switch component is electrically connected to the output end of the second switch component, and the output end of the fifth switch component is electrically connected to the load output end; the control circuit is further used to control the fifth switch component to be turned on when receiving the power-on instruction; and, when the second switch component fails, control the fifth switch component to be turned off; When the third switch component is connected in parallel with the sixth switch component, the pre-charging circuit also includes a seventh switch component; the input end of the seventh switch component is electrically connected to the output end of the sixth switch component, and the output end of the seventh switch component is electrically connected to the load output end; the control circuit is also used to control the seventh switch component to be turned on when receiving the power-on instruction; and, when the sixth switch component fails, control the seventh switch component to be turned off.

11. The power supply circuit according to claim 1, It is characterized in that The control circuit is further configured to control the first switch component and the second switch component to be disconnected when receiving a power-off instruction, so as to power off the load; The control circuit is further used to obtain the output voltage of the first switch component, and / or to obtain the output voltage of the second switch component; The control circuit is further configured to determine that the first switch component is faulty when the output voltage of the first switch component is not zero; and / or to determine that the second switch component is faulty when the output voltage of the second switch component is not zero.

12. An electronic device, It is characterized in that It comprises a battery pack and a power supply circuit as claimed in any one of claims 1 to 11, wherein the battery pack is electrically connected to the power supply circuit, and the power supply circuit is used to transmit the voltage of the battery pack to one or more loads.

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