Detection circuit of high-voltage interlocking switch and electronic device

Abstract

The embodiment of the utility model discloses a detection circuit of a high-voltage interlocking switch and an electronic device, and the detection circuit of the high-voltage interlocking switch comprises a first detection module which is provided with a voltage-stabilized power supply and a first voltage division circuit, and the first voltage division circuit is coupled between the voltage-stabilized power supply and a reference ground and outputs a first detection voltage to a micro-control unit; the second detection module is provided with a second voltage division circuit, and the second voltage division circuit is coupled between the first switch module and the reference ground and outputs a second detection voltage to the micro-control unit; two ends of a high-voltage interlocking switch are respectively connected to the first detection module and the second detection module through a first switch module, and the on-off of the first switch module is controlled by a micro-control unit; and the micro-control unit calculates the resistance values of the two ends of the high-voltage interlocking switch according to the first detection voltage and the second detection voltage, so that the high-voltage interlocking switch is prevented from being misjudged to be in an off state due to environmental influence or material oxidation influence in a normal closing state.

Description

Technical Field

[0001] This application relates to the field of high-voltage interlock circuits, and in particular to a detection circuit and electronic device for a high-voltage interlock switch. Background Technology

[0002] High Voltage Interlock (HVIL) is a circuit and device designed to ensure the safety of high-voltage circuits. It primarily uses low-voltage signals to check the integrity and continuity of the entire high-voltage system circuit, identify abnormal disconnections in the high-voltage circuit, and promptly disconnect the high-voltage input. In other words, it checks the continuity of the high-voltage circuit through the on / off signals of the low-voltage circuit. All high-voltage connector connections in a tram require a high-voltage interlock detection circuit. However, the interlock detection circuit may be set up individually for a specific high-voltage circuit, or it may connect two or more interlock detection circuits in series within a single circuit. That is, the interlock detection circuit can be designed in parallel or series configurations.

[0003] Series mode cannot locate the fault location of high-voltage circuit, while parallel mode is costly. Although it can achieve independent detection of a single high-voltage circuit and accurately locate the fault location, it may misjudge after long-term use. In addition, when the high-voltage interlock signal circuit is affected by the environment, such as oil stains, water vapor corrosion, or oxidation or aging due to the length of use, the internal resistance of the high-voltage interlock signal circuit increases, which may cause the high-voltage interlock signal circuit to identify the normal closed state as an abnormal open state. Therefore, it is urgent to design a new high-voltage interlock detection circuit. Utility Model Content

[0004] Embodiments of this application provide a detection circuit and electronic device for a high-voltage interlock switch to improve the accuracy of detecting the status of the high-voltage interlock switch.

[0005] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0006] This application provides a detection circuit for a high-voltage interlock switch. The high-voltage interlock switch has a first terminal and a second terminal. The detection circuit includes a microcontroller unit, a first switch module, a first detection module, and a second detection module. The first terminal of the high-voltage interlock switch is connected to the first detection module through the first switch module, and the second terminal is connected to the second detection module through the first switch module. The switching of the first switch module is controlled by the microcontroller unit. The first detection module has a regulated power supply and a first voltage divider circuit, the first voltage divider circuit being coupled between the regulated power supply and a reference ground. The second detection module has a second voltage divider circuit, the second voltage divider circuit being coupled between the first switch module and the reference ground. The first detection module divides the voltage value of the regulated power supply and the voltage value of the first terminal of the high-voltage interlock switch through the first voltage divider circuit, and outputs a first detection voltage to the microcontroller unit. The second detection module divides the voltage value of the second terminal of the high-voltage interlock switch through the second voltage divider circuit, and outputs a second detection voltage to the microcontroller unit. The microcontroller unit calculates the resistance value across the high-voltage interlock switch based on the first detection voltage and the second detection voltage.

[0007] Furthermore, the first switch module includes a first detection switch and a second detection switch; the first end of the high-voltage interlock switch is connected to the first voltage divider circuit through the first detection switch, and the second end is connected to the second voltage divider circuit through the second detection switch; the first detection switch and the second detection switch are controlled by the microcontroller unit, and can be turned on or off simultaneously.

[0008] Furthermore, the number of the first detection switch and the second detection switch are the same as the number of the high-voltage interlock switches, and the first detection switch and the second detection switch are grouped in a one-to-one correspondence, with each group of the first detection switch and the second detection switch corresponding to one high-voltage interlock switch; the microcontroller unit can control each high-voltage interlock switch to connect to the first detection module and the second detection module in a time-sharing manner.

[0009] Furthermore, it also includes a third detection module, which has a battery power supply and a third voltage divider circuit. The third voltage divider circuit is coupled between the battery power supply and a reference ground. The third detection module divides the voltage value of the battery power supply through the third voltage divider circuit and outputs a third detection voltage to the microcontroller unit. The second switch has a first terminal, a second terminal, and a controlled terminal. The first terminal is coupled between the third voltage divider circuit and the battery power supply, the second terminal is coupled between the first voltage divider circuit and the regulated power supply, and the controlled terminal is controlled by the microcontroller unit.

[0010] Furthermore, the first voltage divider circuit includes three resistors connected in series in sequence, namely a first voltage divider resistor, a second voltage divider resistor, and a protection resistor. The first voltage divider resistor is coupled to a reference ground, and the protection resistor is coupled to a regulated power supply. The first terminal of the high-voltage interlock switch is connected between the second voltage divider resistor and the protection resistor through a first switch module. The microcontroller unit receives the voltage between the first voltage divider resistor and the second voltage divider resistor as the first detection voltage.

[0011] Furthermore, a first diode is coupled between the protection resistor and the regulated power supply. The positive terminal of the first diode receives the regulated power supply, and the negative terminal is coupled to the protection resistor.

[0012] Furthermore, the second voltage divider circuit includes two resistors connected in series, namely a third voltage divider resistor and a fourth voltage divider resistor, wherein the third voltage divider resistor is coupled to a reference ground; the second terminal of the high-voltage interlock switch is coupled to the fourth voltage divider resistor through a first switch module; the microcontroller unit receives the voltage between the third voltage divider resistor and the fourth voltage divider resistor as the second detection voltage.

[0013] Furthermore, the third voltage divider circuit includes two resistors connected in series, which are a fifth voltage divider resistor and a sixth voltage divider resistor. The fifth voltage divider resistor is coupled to a reference ground, and the sixth voltage divider resistor is coupled to a battery power supply. The microcontroller unit receives the voltage between the fifth and sixth voltage divider resistors as the third detection voltage.

[0014] Furthermore, a second diode is coupled between the sixth voltage divider resistor and the battery power supply. The positive terminal of the second diode receives the battery power supply, and the negative terminal is coupled to the sixth voltage divider resistor.

[0015] In a second aspect, this application provides an electronic device including a circuit board, the circuit board integrating a detection circuit for a high-voltage interlock switch as described in any of the above technical solutions.

[0016] The above-mentioned technical solutions have at least the following advantages or beneficial effects: The detection circuit of the high-voltage interlock switch connects the high-voltage interlock switch between the regulated power supply and the reference ground through the first detection module and the second detection module, so that two voltage drop paths are formed between the voltage of the regulated power supply and the reference ground, and the two voltage drop paths pass through the two ends of the high-voltage interlock switch respectively, so that the first detection voltage and the second detection voltage can not only calculate the resistance between the two ends of the high-voltage interlock switch, but also reflect whether the two ends are short-circuited to the ground of the vehicle body respectively.

[0017] The above technical solution also has the following advantages or beneficial effects: The first switch module includes multiple sets of first detection switches and second detection switches, all controlled by a microcontroller unit. This allows it to adapt to the complex high-voltage circuit distribution of the vehicle and is compatible with series and parallel high-voltage interlock detection circuits, achieving a high degree of modularity and platformization of the detection device. The third detection module also has the function of outputting a third detection voltage to determine the specific voltage of the battery power supply. This improves the accuracy of the detection circuit when the vehicle battery power supply fluctuates greatly and also enables real-time monitoring of the battery power supply voltage value. The third detection module is connected to the detection circuit through the second switch, and the microcontroller unit controls the on / off state of the second switch, providing two voltages to the detection circuit. By comparing the detection voltage values ​​under the two voltages and combining them with the real-time battery power supply voltage value, it is further possible to detect whether there is a short circuit between the two ends of the high-voltage interlock switch and the battery power supply. Attached Figure Description

[0018] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0019] Figure 1 This is a block diagram of the detection circuit module in Example 1;

[0020] Figure 2 This is a block diagram of the detection circuit module in Embodiment 2;

[0021] Figure 3 This is a circuit diagram of Example 3;

[0022] Figure 4 This is a schematic diagram of a circuit board in Embodiment 4. Detailed Implementation

[0023] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further clarifies this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0024] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "circuit" refers to a conductive loop formed by at least one element or sub-circuit through an electrical or electromagnetic connection. When an element or circuit is said to be "connected" to another element or "connected" between two nodes, it can be directly coupled or connected to the other element, or there may be an intermediate element. The connection between elements can be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected" to another element, it means that there is no intermediate element between them. The term "coupled" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium or element; it can be a connection within two elements or an interaction between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0026] The first embodiment provided in this application is a detection circuit for a high-voltage interlock switch, referring to... Figure 1The block diagram of the detection circuit module of the high-voltage interlock switch shown is provided. The output port OUT of the microcontroller unit 1 outputs a control signal to control the on / off state of the first switch module 2. Both the first detection module 3 and the second detection module 4 are coupled to the high-voltage interlock switch through the first switch module 2. Specifically, the first detection module 3 is coupled to the first terminal of the high-voltage interlock switch, and the second detection module 4 is coupled to the second terminal of the high-voltage interlock switch. The first detection module 2 has a regulated power supply and a first voltage divider circuit 31, and the second detection module 4 has a second voltage divider circuit 41. The first voltage divider circuit 31 is coupled between the regulated power supply and reference ground, and the second voltage divider circuit 41 is coupled between the first switch module 2 and reference ground. The first voltage divider circuit 31 outputs a first detection voltage V1 to the input port IN of the microcontroller unit 2, and the second voltage divider circuit 41 outputs a second detection voltage V2 to the input port IN of the microcontroller unit 2.

[0027] The microcontroller unit 1 controls the first switch module 2 through its output port OUT. When the first switch module 2 is turned on, the high-voltage interlock switch, the first detection module 3, and the second detection module 4 form a detection loop. This detection loop includes two voltage drops: one is the voltage of the regulated power supply passing through the first voltage divider circuit 31 to the reference ground, and the other is the voltage of the regulated power supply passing through part of the first voltage divider circuit 31, then through the high-voltage interlock switch and the second voltage divider circuit 41 to the reference ground. When the input port IN of the microcontroller unit 1 receives the first detection voltage V1 and the second detection voltage V2, it runs a logic calculation program to calculate the resistance between the two ends of the high-voltage interlock switch, i.e., the value of R0, using the known voltage value of the regulated power supply, the parameters of the first voltage divider circuit 31 and the second voltage divider circuit 41, and the values ​​of the two received detection voltages. When the high-voltage interlock switch is normally closed and not subject to environmental pollution or corrosion, and the device materials are in a normal state, the internal resistance R0 of the high-voltage interlock switch should be 0 or close to 0. In order to improve the detection redundancy of the normal closed state of the high-voltage interlock switch, considering the possible external influences or slight oxidation of the device materials in the actual closed state, the internal resistance R0 of the high-voltage interlock switch is generally less than 3KΩ. The microcontroller unit 1 presets R0 to be less than or equal to 3KΩ. If the resistance value of the high-voltage interlock switch calculated by the microcontroller unit 1 is within the preset range, it can be determined that the high-voltage interlock switch is normally closed.

[0028] like Figure 1As shown, the first switch module 2 in Embodiment 1 further includes a first detection switch 21 and a second detection switch 22; the first end of the high-voltage interlock switch is connected to the first voltage divider circuit 31 through the first detection switch 21, and the other end is connected to the second voltage divider circuit 41 through the second detection switch 22; the first detection switch 21 and the second detection switch 22 are controlled by the microcontroller unit 1, and can be turned on or off simultaneously.

[0029] The second embodiment provided in this application, based on the first embodiment described above, further includes a third detection module 5 and a second switch 6. Figure 2 The diagram shows the detection circuit module block diagram of Embodiment 2. The third detection module 5 includes a battery power supply and a third voltage divider circuit 51, which is coupled between the battery power supply and a reference ground. The third detection module 5 divides the voltage value of the battery power supply through the third voltage divider circuit 51 and outputs a third detection voltage V3 to the microcontroller unit 1. The second switch 6 has a first terminal, a second terminal, and a controlled terminal. The first terminal is coupled between the third voltage divider circuit 51 and the battery power supply, the second terminal is coupled between the first voltage divider circuit 31 and the regulated power supply, and the controlled terminal is controlled by the microcontroller unit 1. In this embodiment, since the third detection module 5 is connected to the battery power supply, and in the vehicle application scenario, the voltage of the battery power supply is generally greater than the voltage of the regulated power supply, when the second switch 6 is controlled to be turned on, the detection circuit formed after closing the first switch module 2 is provided with voltage by the battery power supply. Thus, the input port IN of the microcontroller unit 1 can receive two different first detection voltages V1 and second detection voltages V3 in the on and off states of the second switch 6, and determine whether there is a short circuit fault between the first terminal of the high-voltage interlock switch and the battery power supply based on the change in the value of the first detection voltage V1, and determine whether there is a short circuit fault between the second terminal of the high-voltage interlock switch and the battery power supply based on the change in the value of the second detection voltage V2.

[0030] In the electric vehicle, the output voltage of the battery power supply fluctuates between 9V and 16V due to the influence of the on-board battery. The microcontroller unit 1 receives the third detection voltage V3 and calculates the output voltage of the battery power supply based on the parameters of the third voltage divider circuit 51, thereby avoiding the influence of the on-board battery voltage change on the detection circuit.

[0031] Reference Figure 1 and Figure 2 In the embodiments provided in this application, the first switch module 2 may further be configured such that the number of the first detection switch 21 and the second detection switch 22 are both the same as the number of the high-voltage interlock switches, such as... Figure 2As shown, the first detection switch 21 and the second detection switch 22 are grouped in a one-to-one correspondence, and the Nth group of first detection switches 21 and second detection switches 22 corresponds to the Nth high-voltage interlock switch; the microcontroller unit 1 controls each high-voltage interlock switch to connect to the first detection module 3 and the second detection module 4 in a time-sharing manner. Through the microcontroller unit 1 and the modular switch design, the function of multiple high-voltage interlock switches being able to detect independently can be realized, which can better adapt to the complex distribution of high-voltage circuits in the entire trolleybus.

[0032] Embodiment 3 of this application discloses a feasible specific device layout for each detection module. Figure 3 This is a circuit diagram of Example 3, as shown below. Figure 3 As shown, in this embodiment, the battery power supply is a Battery, and the regulated power supply is an LDO (Low-dropout regulator). It should be understood that the selection of an LDO as the regulated power supply is not intended to limit the scope of the claims. The first voltage divider circuit 31 includes three resistors connected in series in sequence: a first voltage divider resistor R11, a second voltage divider resistor R12, and a protection resistor R13. The first voltage divider resistor R11 is coupled to a reference ground, and the protection resistor R13 is coupled to the regulated power supply. The first terminal of the high-voltage interlock switch is connected between the second voltage divider resistor R12 and the protection resistor R13 through the first switch module 2. The microcontroller unit 1 receives the voltage between the first voltage divider resistor R11 and the second voltage divider resistor R12 as the first detection voltage V1. Furthermore, a first diode D1 is coupled between the protection resistor R13 and the regulated power supply. The positive terminal of the first diode D1 receives the regulated power supply, and the negative terminal is coupled to the protection resistor R13 to prevent the regulated power supply from being damaged by reverse current in the circuit.

[0033] The second voltage divider circuit 41 includes two resistors connected in series, namely a third voltage divider resistor R21 and a fourth voltage divider resistor R22, wherein the third voltage divider resistor R21 is coupled to a reference ground; the second terminal of the high-voltage interlock switch is coupled to the fourth voltage divider resistor R22 through the first switch module 2; the microcontroller unit 1 receives the voltage between the third voltage divider resistor R21 and the fourth voltage divider resistor R22 as the second detection voltage V2.

[0034] The third voltage divider circuit 51 includes two resistors connected in series, namely a fifth voltage divider resistor R31 and a sixth voltage divider resistor R32. The fifth voltage divider resistor R31 is coupled to a reference ground, and the sixth voltage divider resistor R32 is coupled to the battery power supply. The microcontroller unit 1 receives the voltage between the fifth voltage divider resistor R31 and the sixth voltage divider resistor R32 as the third detection voltage V3. Furthermore, a second diode D2 is coupled between the sixth voltage divider resistor R32 and the battery power supply. The positive terminal of the second diode D2 receives the battery power supply, and the negative terminal is coupled to the sixth voltage divider resistor R32 to prevent the battery power supply from being damaged by reverse current in the circuit.

[0035] Based on the specific component layout of each detection module, it can be seen that: the third detection voltage V3 output by the third detection module 51 is the voltage across the fifth voltage divider resistor R31. The microcontroller unit 1 can determine the value of Battery in real time through the parameters of the fifth voltage divider resistor R31 and the second voltage divider resistor R32. When both the first switch module 2 and the second switch 6 are controlled to be turned on, the first detection voltage V1 is the voltage across the first voltage divider resistor R11, and the second detection voltage V3 is the voltage across the third voltage divider resistor R21. In the normal closed state of the high-voltage interlock switch, the first detection voltage V1 and the second voltage divider resistor R21 are... Both detection voltages V2 are affected by the internal resistance R0 of the high-voltage interlock switch and the changing value of Battery. When the first switch module 2 is controlled to be turned on and the second switch 6 is controlled to be turned off, both the first detection voltage V1 and the second detection voltage V2 are only affected by the internal resistance R0 of the high-voltage interlock switch. The microcontroller unit 1 can calculate the resistance value of the high-voltage interlock switch by controlling the on and off of the second switch 6 and combining it with the value of Battery, and determine whether it is in an off state, or whether there is a grounding fault or a short circuit to the power supply at the first and second terminals of the high-voltage interlock switch.

[0036] The fourth embodiment provided in this application is an electronic device, including a circuit board, on which a detection circuit for any of the high-voltage interlock switches in the above embodiments is integrated. Figure 4 This is a schematic diagram of a circuit board in Embodiment 4, as shown below. Figure 4 As shown, the circuit board integrates an MCU, a first voltage divider circuit 31, a second voltage divider circuit 41, a third voltage divider circuit 51, a battery power interface (Battery-IN), a linear regulated power supply (LDO), a first switch module 2, and a second switch 6. The battery power interface (Battery-IN) is used to connect to the battery power supply. In this embodiment, the first switch module 2 has N sets of first detection switches 21 and second detection switches 22 to expand the number of detection ports of the high-voltage interlock switch detection circuit in this embodiment, so as to be compatible with various high-voltage interlock switches in different tram vehicles.

[0037] The above description is only intended to help understand the core idea of ​​the technical solution of this application. For those skilled in the art, various improvements and modifications can be made to this application without departing from the principles of this application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A detection circuit of a high-voltage interlock switch, characterized in that, the high-voltage interlock switch has a first end and a second end, and the detection circuit comprises a micro control unit, a first switch module, a first detection module and a second detection module; the first end of the high-voltage interlock switch is connected to the first detection module through the first switch module, and the second end is connected to the second detection module through the first switch module; the first switch module is controlled by the micro control unit; the first detection module has a voltage stabilizer and a first voltage divider circuit, the first voltage divider circuit is coupled between the voltage stabilizer and a reference ground, and the second detection module has a second voltage divider circuit, the second voltage divider circuit is coupled between the first switch module and the reference ground; the first detection module divides the voltage value of the voltage stabilizer and the voltage value of the first end of the high-voltage interlock switch through the first voltage divider circuit, and outputs a first detection voltage to the micro control unit; the second detection module divides the voltage value of the second end of the high-voltage interlock switch through the second voltage divider circuit, and outputs a second detection voltage to the micro control unit; the micro control unit calculates the resistance value between the two ends of the high-voltage interlock switch according to the first detection voltage and the second detection voltage. 2.The detection circuit of the high-voltage interlock switch according to claim 1, characterized in that, the first switch module comprises a first detection switch and a second detection switch; the first end of the high-voltage interlock switch is connected to the first voltage divider circuit through the first detection switch, and the second end is connected to the second voltage divider circuit through the second detection switch; the first detection switch and the second detection switch are controlled by the micro control unit and are simultaneously turned on or turned off. 3.The detection circuit of the high-voltage interlock switch according to claim 2, characterized in that, the number of the first detection switch and the second detection switch is the same as the number of the high-voltage interlock switch, and the first detection switch and the second detection switch correspond to each other in groups, and each group of the first detection switch and the second detection switch corresponds to one high-voltage interlock switch; the micro control unit can control each high-voltage interlock switch to access the first detection module and the second detection module in time.

4. The detection circuit for a high voltage interlock switch of claim 1, wherein, Further comprising: a third detection module having a battery power supply and a third voltage divider circuit, the third voltage divider circuit being coupled between the battery power supply and the reference ground; the third detection module divides the voltage value of the battery power supply through the third voltage divider circuit, and outputs a third detection voltage to the micro control unit; a second switch having a first end, a second end and a controlled end, wherein the first end is coupled between the third voltage divider circuit and the battery power supply, the second end is coupled between the first voltage divider circuit and the voltage stabilizer, and the controlled end is controlled by the micro control unit. 5.The detection circuit of the high-voltage interlock switch according to claim 1, characterized in that, the first voltage divider circuit comprises three resistors connected in series, the three resistors being a first voltage divider resistor, a second voltage divider resistor and a protection resistor, wherein the first voltage divider resistor is coupled to the reference ground, and the protection resistor is coupled to the voltage stabilizer; The first end of the high-voltage interlock switch is connected to the second voltage dividing resistor and the protection resistor through the first switch module. The micro control unit receives the voltage between the first voltage dividing resistor and the second voltage dividing resistor as the first detection voltage.

6. The detection circuit of the high-voltage interlock switch according to claim 5, wherein, The protection resistor and the voltage stabilizer are coupled with a first diode, the positive terminal of the first diode receives the voltage stabilizer, and the negative terminal is coupled to the protection resistor.

7. The detection circuit of the high-voltage interlock switch according to claim 1, wherein, The second voltage dividing circuit includes two series resistors, which are the third voltage dividing resistor and the fourth voltage dividing resistor, wherein the third voltage dividing resistor is coupled to the reference ground; The second end of the high-voltage interlock switch is coupled to the fourth voltage dividing resistor through the first switch module; The micro control unit receives the voltage between the third voltage dividing resistor and the fourth voltage dividing resistor as the second detection voltage.

8. The detection circuit of the high-voltage interlock switch according to claim 4, wherein, The third voltage dividing circuit includes two series resistors, which are the fifth voltage dividing resistor and the sixth voltage dividing resistor, wherein the fifth voltage dividing resistor is coupled to the reference ground, and the sixth voltage dividing resistor is coupled to the battery power supply; The micro control unit receives the voltage between the fifth voltage dividing resistor and the sixth voltage dividing resistor as the third detection voltage.

9. The detection circuit of the high-voltage interlock switch according to claim 8, wherein, The sixth voltage dividing resistor and the battery power supply are coupled with a second diode, the positive terminal of the second diode receives the battery power supply, and the negative terminal is coupled to the sixth voltage dividing resistor.

10. An electronic device, comprising: It includes: The circuit board is integrated with the detection circuit of the high-voltage interlock switch according to any one of claims 1-9.

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