High-voltage interlocking circuit, high-voltage interlocking detection circuit and high-voltage equipment

Abstract

The embodiment of the invention relates to a high-voltage interlock circuit, a high-voltage interlock detection circuit and high-voltage equipment. The high-voltage interlock circuit comprises a resistor set, at least one high-voltage interlock connector and a frequency indication signal generation circuit. The resistor set includes at least one resistor. A single high voltage interlock connector includes an interlock detection contact and a power contact. The interlock detection contacts are coupled to respective resistors. When the first high voltage interlock connector is coupled to an external mating connector, the interlock detection contact of the first high voltage interlock connector is coupled to the interlock detection portion of the mating connector. An equivalent resistance value of the set of resistors is determined by a coupling state of each interlock detection contact in the at least one high voltage interlock connector and an interlock detection portion of a corresponding mating connector. The frequency indication signal generation circuit generates a frequency indication signal according to the equivalent resistance value of the resistor set.

Description

Technical Field

[0001] The embodiments disclosed herein generally relate to the field of circuit technology, and more specifically to high-voltage interlock circuits, high-voltage interlock detection circuits, and high-voltage equipment. Background Technology

[0002] High-voltage interlock circuits, also known as high-voltage interlocked loops (HVIL), use low-voltage signals to check the electrical integrity of high-voltage circuits in high-voltage systems (e.g., electric vehicles). When a high-voltage circuit is disconnected or its integrity is compromised, appropriate safety measures must be activated. Summary of the Invention

[0003] The embodiments of this disclosure provide a high-voltage interlock circuit, a high-voltage interlock detection circuit, and a high-voltage device.

[0004] According to a first aspect of this disclosure, a high-voltage interlock circuit is provided. The high-voltage interlock circuit includes: a resistor set including at least one resistor; at least one high-voltage interlock connector, wherein a single high-voltage interlock connector includes an interlock detection contact and a power contact, the interlock detection contact being coupled to a corresponding resistor in the resistor set, wherein, in the case that a first high-voltage interlock connector in the at least one high-voltage interlock connector is coupled to an external mating connector, the interlock detection contact of the first high-voltage interlock connector is coupled to an interlock detection portion of the mating connector, and the power contact of the first high-voltage interlock connector is coupled to a power portion of the mating connector, the equivalent resistance value of the resistor set being determined by the coupling state of each interlock detection contact in the at least one high-voltage interlock connector and the interlock detection portion of the corresponding mating connector; and a frequency indication signal generation circuit configured to generate a frequency indication signal based on the equivalent resistance value of the resistor set.

[0005] According to a second aspect of this disclosure, a high-voltage interlock detection circuit is provided. The high-voltage interlock detection circuit includes: a high-voltage interlock circuit as described in the first aspect of this disclosure; and a diagnostic circuit configured to detect the frequency of a frequency indication signal, and to determine, based on the frequency, the coupling state between each interlock detection contact in the at least one high-voltage interlock connector and the interlock detection portion of a corresponding mating connector.

[0006] According to a third aspect of this disclosure, a high-voltage device is provided. The high-voltage device includes a high-voltage interlock detection circuit as described in a second aspect of this disclosure. Attached Figure Description

[0007] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0008] Figure 1 The illustration shows a schematic diagram of an example environment in which a high-voltage interlock circuit according to an embodiment of the present disclosure may be implemented;

[0009] Figure 2 A schematic block diagram of a high-voltage interlock circuit according to an embodiment of the present disclosure is shown.

[0010] Figure 3 Another schematic block diagram of a high-voltage interlock circuit according to an embodiment of the present disclosure is shown;

[0011] Figure 4 The diagram shows... Figure 2 or Figure 3 An exemplary circuit diagram of a frequency indication signal generation circuit in a high-voltage interlock circuit;

[0012] Figure 5 A schematic block diagram of a high-voltage interlock detection circuit according to an embodiment of the present disclosure is shown.

[0013] In the various accompanying figures, the same or corresponding labels indicate the same or corresponding parts. It should be noted that the elements in the accompanying figures are schematic and not drawn to scale. Detailed Implementation

[0014] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0015] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0016] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this subject matter pertains. It will be further understood that terms such as those defined in commonly used dictionaries shall be interpreted as having the meaning consistent with their meaning in the context of the specification and in the relevant art, and shall not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, the statement of “connecting” or “coupling” two or more parts together shall mean that these parts are directly joined together or joined through at least one intermediate component.

[0017] As previously mentioned, the electrical connection integrity of one or more high-voltage circuits in a high-voltage system (e.g., an electric vehicle) can be checked using a high-voltage interlock circuit. A high-voltage interlock circuit typically includes at least one high-voltage interlock connector, each of which can be used to check a single high-voltage circuit. A single high-voltage interlock connector includes an interlock detection contact and a power contact. The high-voltage interlock connector is considered to be properly connected when its interlock detection contact is well coupled to the interlock detection portion of an external mating connector (the two are interlocked). The high-voltage interlock connector is considered not properly connected when its interlock detection contact is not well coupled to the interlock detection portion of the mating connector (the two are not interlocked). In a high-voltage interlock circuit, when any of the high-voltage interlock connectors is not properly connected, the high-voltage interlock circuit forms an open circuit and sends an open-circuit indication signal to an external diagnostic circuit. At this time, the external diagnostic circuit can determine that the high-voltage interlock circuit is abnormal, but cannot identify which high-voltage interlock connector is not properly connected.

[0018] Accurately identifying which high-voltage interlock connector is not properly connected helps to quickly locate the corresponding high-voltage circuit, enabling the initiation of safety measures for that circuit. Therefore, this disclosure proposes a high-voltage interlock circuit that not only indicates a high-voltage interlock circuit malfunction but also identifies which high-voltage interlock connector is not properly connected, thereby improving diagnostic efficiency and helping maintenance personnel to more quickly initiate safety measures for the faulty high-voltage circuit.

[0019] The embodiments of this disclosure will now be described in further detail with reference to the accompanying drawings, wherein... Figure 1 The illustration shows an example environment in which a high-voltage interlock circuit according to an embodiment of the present disclosure may be implemented.

[0020] like Figure 1As shown, example environment 1 includes a vehicle 5. A high-voltage device 5a (e.g., a vehicle air conditioning compressor) may be installed in the vehicle 5. The high-voltage device 5a may include at least one high-voltage circuit (not shown) and a high-voltage interlock detection circuit 40. The high-voltage interlock detection circuit 40 is used to detect the connection status of each high-voltage circuit. The high-voltage interlock detection circuit 40 may include a high-voltage interlock circuit 100 and a diagnostic circuit 41 according to embodiments of this disclosure. Reference will be made below. Figure 5 The high-voltage interlock detection circuit 40 will be introduced below. First, the high-voltage interlock circuit 100 according to an embodiment of this disclosure will be described.

[0021] Figure 2 A schematic block diagram of a high-voltage interlock circuit 100 according to an embodiment of the present disclosure is shown. Figure 2 In the example, the high-voltage interlock circuit 100 includes: a resistor set 120, at least one high-voltage interlock connector 131-a, 132-a, ..., 13N-a, and a frequency indication signal generation circuit 110.

[0022] The resistor set 120 includes at least one resistor 121, 122, ..., 12N. In some embodiments of this disclosure, such as... Figure 2 As shown, at least one resistor 121, 122, ..., 12N is connected in series. Figure 2 In an alternative example, one or more resistors in resistor set 120 may also be connected in parallel. For example, resistor 121 may be replaced by two or more resistors connected in parallel. In other words, resistor set 120 may contain some resistors connected in parallel, which may be connected in series with other resistors.

[0023] In this document, N can be an integer greater than or equal to 1. When N equals 1, the at least one high-voltage interlock connector 131-a, 132-a, ..., 13N-a may include only one high-voltage interlock connector 131-a, and the resistor set 120 may include only one resistor 121. When N equals 2, the at least one high-voltage interlock connector 131-a, 132-a, ..., 13N-a may include only two high-voltage interlock connectors 131-a, 132-a, and the resistor set 120 may include only two resistors 121, 122.

[0024] Each of the at least one high-voltage interlocking connectors 131-a, 132-a, ..., 13N-a includes an interlock detection contact and a power contact (not shown). The interlock detection contact is coupled to a corresponding resistor in a set of resistors. When the first high-voltage interlocking connector of the at least one high-voltage interlocking connector 131-a, 132-a, ..., 13N-a is coupled to an external mating connector, the interlock detection contact of the first high-voltage interlocking connector is coupled to the interlock detection portion of the mating connector, and the power contact of the first high-voltage interlocking connector is coupled to the power portion of the mating connector. In this document, "first high-voltage interlocking connector" may refer to any one of the at least one high-voltage interlocking connectors 131-a, 132-a, ..., 13N-a.

[0025] exist Figure 2 In the example, the interlock detection contact of the high-voltage interlock connector 131-a includes two conductive terminals, and the interlock detection part of the mating connector 131-b includes corresponding two conductive terminals, which are electrically connected (i.e., short-circuited) to each other. The two conductive terminals of the interlock detection contact of the high-voltage interlock connector 131-a are coupled to the two ends of resistor 121. Although in Figure 2 The diagram shows the two conductive terminals of the interlock detection contact directly coupled to the two ends of resistor 121. However, those skilled in the art will understand that the two conductive terminals of the interlock detection contact can also be coupled to the two ends of resistor 121 via one or more intermediate components (e.g., resistors or other electrical components). In the case where high-voltage interlock connector 131-a is coupled to mating connector 131-b, the interlock detection contact of high-voltage interlock connector 131-a is coupled to the interlock detection portion of mating connector 131-b, thereby short-circuiting the two conductive terminals of the interlock detection contact. Furthermore, the power contact (not shown) of high-voltage interlock connector 131-a is coupled to the power portion (not shown) of mating connector 131-b, thereby including the circuit coupled to the power contact and the circuit coupled to the power portion in a single loop.

[0026] Similarly, high-voltage interlock connector 132-a can be coupled to mating connector 132-b. The interlock detection contact of high-voltage interlock connector 132-a is coupled to resistor 122. Likewise, high-voltage interlock connector 13N-a can be coupled to mating connector 13N-b. The interlock detection contact of high-voltage interlock connector 13N-a is coupled to resistor 12N.

[0027] The correspondence between high-voltage interlock connectors and resistors is preset. Each high-voltage interlock connector corresponds to a different resistor. Although in Figure 2 The number of resistors shown is equal to the number of high-voltage interlock connectors; however, those skilled in the art will understand that... Figure 2In an alternative example, the number of resistors may exceed the number of high-voltage interlock connectors. Therefore, one or more resistors in resistor set 120 may not correspond to a high-voltage interlock connector.

[0028] The equivalent resistance value of resistor set 120 is determined by the coupling state of each high-voltage interlock connector and its corresponding mating connector in the at least one high-voltage interlock connector 131-a, 132-a, ..., 13N-a. In some embodiments of this disclosure, when the at least one resistor 121, 122, ..., 12N is connected in series and no high-voltage interlock connector is normally connected, the equivalent resistance value of resistor set 120 is the sum of the resistance values ​​of the at least one resistor 121, 122, ..., 12N. When the first high-voltage interlock connector in the at least one high-voltage interlock connector 131-a, 132-a, ..., 13N-a is coupled to the mating connector, the two conductive terminals of the interlock detection contact of the first high-voltage interlock connector are short-circuited, causing the first resistor to be short-circuited, thereby changing the equivalent resistance value of resistor set 120. In this case, the equivalent resistance value of resistor set 120 is equal to the sum of the resistance values ​​of the at least one resistor 121, 122, ..., 12N minus the resistance value of the first resistor. In this document, "first high-voltage interlock connector" may refer to any one of the at least one high-voltage interlock connectors 131-a, 132-a, ..., 13N-a. "First resistor" refers to the resistor among the at least one resistor 121, 122, ..., 12N that corresponds to the first high-voltage interlock connector.

[0029] A frequency indication signal generation circuit 110 is coupled to a resistor set 120. The frequency indication signal generation circuit 110 is configured to generate a frequency indication signal based on the equivalent resistance value of the resistor set 120. Figure 2 In the example, the frequency indication signal is output from the output terminal OUT of the frequency indication signal generation circuit 110.

[0030] In some embodiments of this disclosure, a first terminal of resistor set 120 is coupled to a first input terminal P1 of frequency indication signal generation circuit 110, and a second terminal of resistor set 120 is coupled to a second input terminal P2 of frequency indication signal generation circuit 110. The equivalent resistance value of resistor set 120 is equal to the resistance value between the first terminal and the second terminal of resistor set 120. The frequency of the frequency indication signal generated by frequency indication signal generation circuit 110 is associated with the equivalent resistance value of resistor set 120. If one or more high-voltage interlock connectors are not properly connected, resulting in a change in the equivalent resistance value of resistor set 120, the frequency of the frequency indication signal changes accordingly, thereby indicating that the high-voltage interlock connector is not properly connected.

[0031] In some embodiments of this disclosure, the equivalent resistance value of the resistor set 120 differs depending on the coupling state of each high-voltage interlock connector 131-a, 132-a, ..., 13N-a and its corresponding mating connector. Thus, the equivalent resistance value of the resistor set 120 can indicate which high-voltage interlock connectors are not properly connected, thereby improving diagnostic efficiency.

[0032] refer to Figure 2 For example, if the number of resistors in resistor set 120 is equal to the number of high-voltage interlock connectors, and all high-voltage interlock connectors are properly connected, the equivalent resistance of resistor set 120 is zero. Assuming high-voltage interlock connector 131-a is not coupled to connector 131-b, then resistor 121 is not short-circuited, and the equivalent resistance of resistor set 120 is r1. r1 represents the resistance value of resistor 121. Assuming high-voltage interlock connector 132-a is not coupled to connector 132-b, then resistor 122 is not short-circuited, and the equivalent resistance of resistor set 120 is r2. r2 represents the resistance value of resistor 122. Assuming high-voltage interlock connector 13N-a is not coupled to connector 13N-b, then resistor 12N is not short-circuited, and the equivalent resistance of resistor set 120 is rN. rN represents the resistance value of resistor 12N. The resistance value of each of the at least one resistor 121, 122, ..., 12N can be set to be different, and the sum of the resistance values ​​of any one or more resistors is also different from the sum of the resistance values ​​of the other one or more resistors. For example, r1 + r2 is not equal to rN. r1 + rN is not equal to r2. r2 + rN is not equal to r1.

[0033] In one example, the resistance values ​​of the at least one resistor 121, 122, ..., 12N can be set in a geometric progression, for example, 1:2:...:2 (N-1) .

[0034] In some embodiments of this disclosure, the high-voltage interlock circuit 100 may also include a mating connector. That is, the mating connector is part of the high-voltage interlock circuit 100. (See reference...) Figure 2 The high-voltage interlock circuit 100 may include one or more of the following mating connectors: 131-b, 132-b, ..., 13N-b.

[0035] In some embodiments of this disclosure, the power contacts of the high-voltage interlock connector are coupled to a high-voltage power supply, and the power portion of the mating connector is coupled to a high-voltage electrical device. Thus, the coupling state of the high-voltage interlock connector and the mating connector can indicate whether the corresponding high-voltage power supply is supplying power normally.

[0036] In some other embodiments of this disclosure, the power contacts of the high-voltage interlock connector are coupled to high-voltage electrical equipment, and the power portion of the mating connector is coupled to a high-voltage power supply. Thus, the coupling state of the high-voltage interlock connector and the mating connector can indicate whether the corresponding high-voltage electrical equipment is being supplied with power normally.

[0037] In this document, one or both of the high-voltage power supply and the high-voltage electrical equipment may be part of the internal high-voltage circuit of the high-voltage equipment using the high-voltage interlock circuit 100, or part of the external high-voltage circuit of the high-voltage equipment.

[0038] In practical applications, the high-voltage interlock circuit 100 is arranged on the high-voltage side (the side using the high-voltage power supply), while the diagnostic circuit 41 is arranged on the low-voltage side (the side using the low-voltage power supply). The inventors of this disclosure have noted that, in order to achieve a safe distance between the high and low voltages, the high-voltage interlock circuit 100 and the diagnostic circuit 41 need to be arranged relatively far apart, resulting in a large overall area occupied by them. Therefore, embodiments of this disclosure propose providing an isolation circuit between the high-voltage and low-voltage sides to reduce the required safe distance between the high and low voltages, further reducing coupling noise between the high and low voltages, and improving the electromagnetic compatibility (EMC) of the high-voltage interlock circuit. In the example where the high-voltage interlock detection circuit 40 is applied to high-voltage equipment 5a, the isolation circuit can be implemented using existing isolation channels in high-voltage equipment 5a, thus not increasing the area of ​​high-voltage equipment 5a.

[0039] Figure 3 A schematic block diagram of the high-voltage interlock circuit 100 in this configuration is shown. Figure 2 Based on the high-voltage interlock circuit 100 shown, Figure 3 The high-voltage interlock circuit 100 also includes an isolation circuit 340. The isolation circuit 340 is coupled to the output terminal OUT of the frequency indication signal generation circuit 110. The isolation circuit 340 is configured to transmit the frequency indication signal to an external diagnostic circuit and to electrically isolate the high-voltage circuit coupled to the at least one high-voltage interlock connector 131-a, 132-a, ..., 13N-a from the diagnostic circuit. Here, the high-voltage circuit can refer to a high-voltage circuit external to the high-voltage equipment using the high-voltage interlock circuit 100, or a high-voltage circuit internal to the high-voltage equipment. In one example, the high-voltage circuit may be coupled to a power contact in the high-voltage interlock connector.

[0040] In some embodiments of this disclosure, the frequency indication signal generation circuit 110 may be an oscillator circuit. Figure 4 An exemplary circuit diagram of a frequency indication signal generation circuit 110 is shown. Figure 4In the example, the frequency indication signal generation circuit 110 may include: a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a capacitor C1, and an operational amplifier AMP.

[0041] In this circuit, the first terminal of the fifth resistor R5 is coupled to the first voltage terminal V1. The second terminal of the fifth resistor R5 is coupled to the first terminal of the second resistor R2, the first terminal of the third resistor R3, and the first input terminal of the operational amplifier AMP. The second input terminal of the operational amplifier AMP is coupled to the first terminal of the capacitor C1 and the first input terminal P1 of the frequency indication signal generation circuit 110. The second terminal of the capacitor C1 is coupled to the second voltage terminal V2. The second terminal of the second resistor R2 is coupled to the second voltage terminal V2. The second terminal of the third resistor R3 is coupled to the first terminal of the fourth resistor R4, the output terminal of the operational amplifier AMP, and the output terminal OUT of the frequency indication signal generation circuit 110. The second terminal of the fourth resistor R4 is coupled to the second input terminal P2 of the frequency indication signal generation circuit 110.

[0042] exist Figure 4 In the example, a high-voltage signal (e.g., 5V) is input from the first voltage terminal V1, and the second voltage terminal V2 is grounded. The first input terminal of the operational amplifier AMP is the non-inverting input terminal. The second input terminal of the operational amplifier AMP is the inverting input terminal. Those skilled in the art will understand that, based on the above inventive concept... Figure 4 Any modifications to the circuit shown should also fall within the scope of this disclosure. In this modification, the voltage terminal may also have the same... Figure 4 The examples shown have different settings. Figure 4 The internal structure of the frequency indication signal generation circuit 110 is exemplary, and the frequency indication signal generation circuit 110 can also be implemented by other circuits besides the oscillator circuit. The embodiments of this disclosure do not limit the specific implementation of the frequency indication signal generation circuit 110.

[0043] Combination Figure 3 and Figure 4 With all high-voltage interlock connectors properly connected, the equivalent resistance of resistor set 120 is zero, and the frequency of frequency indication signal generation circuit 110 depends on the product of the resistance value of the fourth resistor R4 and the capacitance value of capacitor C1 (R4×C1). Here, R4 represents the resistance value of the fourth resistor R4, and C1 represents the capacitance value of capacitor C1.

[0044] If the high-voltage interlock connector 131 is not properly connected, the equivalent resistance of resistor set 120 is r1 (i.e., the equivalent resistance between P1 and P2 is r1), and the frequency of the frequency indication signal generation circuit 110 depends on (R4 + r1) × C1. If the high-voltage interlock connector 132 is not properly connected, the equivalent resistance of resistor set 120 is r2, and the frequency of the frequency indication signal generation circuit 110 depends on (R4 + r2) × C1. If both high-voltage interlock connectors 131 and 132 are not properly connected, the equivalent resistance of resistor set 120 is r1 + r2, and the frequency of the frequency indication signal generation circuit 110 depends on (R4 + r1 + r2) × C1. Thus, the frequency of the frequency indication signal generation circuit 110 reflects the equivalent resistance value of resistor set 120, allowing determination of which resistor(s) in resistor set 120 are not short-circuited, and consequently, which high-voltage interlock connector(s) are not properly connected.

[0045] Figure 5 A schematic block diagram of a high-voltage interlock detection circuit 40 according to an embodiment of the present disclosure is shown. Figure 5 In the example, the high-voltage interlock detection circuit 40 includes a high-voltage interlock circuit 100 and a diagnostic circuit 41. The diagnostic circuit 41 is coupled to the isolation circuit 340 in the high-voltage interlock circuit 100 to receive a frequency indication signal from the frequency indication signal generation circuit 110. The diagnostic circuit 41 is configured to detect the frequency of the frequency indication signal and determine the coupling state of each high-voltage interlock connector and its corresponding mating connector in the at least one high-voltage interlock connector 131-a, 132-a, ..., 13N-a based on the detected frequency.

[0046] In some embodiments of this disclosure, the diagnostic circuit 41 can be implemented using a microcontroller unit (MCU). The diagnostic circuit 41 can pre-store the correspondence between the frequency of the frequency indication signal and the connection status of the high-voltage interlock connector, thereby quickly determining which (or which) high-voltage interlock connectors are not properly connected based on the detected frequency.

[0047] In summary, the high-voltage interlock circuit according to embodiments of this disclosure can not only indicate abnormalities in the high-voltage interlock circuit but also indicate which high-voltage interlock connector is not properly connected, thereby improving diagnostic efficiency and helping maintenance personnel to more quickly initiate safety measures for the faulty branch. Furthermore, the high-voltage interlock circuit according to embodiments of this disclosure reduces the required safety distance between the high and low voltage sides by providing an isolation circuit between the high-voltage and low-voltage sides, resulting in less coupling noise between the high and low voltage sides and improving the EMC of the high-voltage interlock circuit. Similarly, the high-voltage interlock detection circuit and high-voltage equipment according to embodiments of this disclosure also have the above-mentioned beneficial effects.

[0048] Unless otherwise expressly indicated by the context, the singular form of words used herein and in the appended claims includes the plural form, and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Where the term “example” is used herein, particularly when it follows a set of terms, the “example” is merely exemplary and illustrative and should not be considered exclusive or pervasive.

[0049] Further aspects and scope of adaptation become apparent from the description provided herein. It should be understood that various aspects of this application may be implemented individually or in combination with at least one other aspect. It should also be understood that the descriptions and specific embodiments herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0050] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A high-voltage interlock circuit (100), comprising: A resistor assembly (120) comprising at least one resistor (121, 122, ..., 12N); At least one high-voltage interlock connector (131-a, 132-a, ..., 13N-a), each high-voltage interlock connector including an interlock detection contact and a power contact, the interlock detection contact being coupled to a corresponding resistor in the resistor set (120), wherein, in the case where the first high-voltage interlock connector in the at least one high-voltage interlock connector (131-a, 132-a, ..., 13N-a) is coupled to an external mating connector, the interlock detection contact of the first high-voltage interlock connector is coupled to the interlock detection portion of the mating connector, and the power contact of the first high-voltage interlock connector is coupled to the power portion of the mating connector, the equivalent resistance value of the resistor set (120) being determined by the coupling state of each interlock detection contact in the at least one high-voltage interlock connector and the interlock detection portion of the corresponding mating connector; as well as A frequency indication signal generation circuit (110) is configured to generate a frequency indication signal based on the equivalent resistance value of the resistor set (120).

2. The high-voltage interlock circuit (100) according to claim 1 further includes: An isolation circuit (340) is configured to transmit the frequency indication signal to an external diagnostic circuit (41) and to electrically isolate the high-voltage circuit coupled to the at least one high-voltage interlock connector (131-a, 132-a, ..., 13N-a) from the diagnostic circuit (41).

3. The high-voltage interlock circuit (100) according to claim 1 or 2, wherein, The two conductive terminals of the interlock detection contact are respectively coupled to the two ends of the corresponding resistor. When the interlock detection contact of the first high-voltage interlock connector is coupled to the interlock detection part of the mating connector, the two conductive terminals of the interlock detection contact are short-circuited.

4. The high-voltage interlock circuit (100) according to claim 3, wherein, The at least one resistor (121, 122, ..., 12N) is connected in series.

5. The high-voltage interlock circuit (100) according to claim 4, wherein, The resistance values ​​of the at least one resistor (121, 122, ..., 12N) are set in a geometric sequence.

6. The high-voltage interlock circuit (100) according to claim 1 or 2, wherein, The first end of the resistor set (120) is coupled to the first input terminal (P1) of the frequency indication signal generation circuit (110), and the second end of the resistor set (120) is coupled to the second input terminal (P2) of the frequency indication signal generation circuit (110). When the coupling states of each interlock detection contact in the at least one high-voltage interlock connector and the interlock detection part of the corresponding mating connector are different, the equivalent resistance value of the resistor set (120) is different.

7. The high-voltage interlock circuit (100) according to claim 6, wherein the frequency indication signal generating circuit (110) comprises: The components include a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a capacitor (C1), and an operational amplifier (AMP). The first end of the fifth resistor (R5) is coupled to the first voltage terminal (V1), and the second end of the fifth resistor (R5) is coupled to the first end of the second resistor (R2), the first end of the third resistor (R3), and the first input terminal of the operational amplifier (AMP). The second input terminal of the operational amplifier (AMP) is coupled to the first terminal of the capacitor (C1) and the first input terminal (P1) of the frequency indication signal generation circuit (110); The second terminal of the capacitor (C1) is coupled to the second voltage terminal (V2); The second terminal of the second resistor (R2) is coupled to the second voltage terminal (V2); The second end of the third resistor (R3) is coupled to the first end of the fourth resistor (R4), the output of the operational amplifier (AMP), and the output (OUT) of the frequency indication signal generation circuit (110); The second end of the fourth resistor (R4) is coupled to the second input terminal (P2) of the frequency indication signal generation circuit (110).

8. The high-voltage interlock circuit (100) according to claim 1 or 2 further includes the mating connector. in, The power contacts of the high-voltage interlock connector are coupled to a high-voltage power supply, and the power components of the mating connector are coupled to high-voltage electrical equipment. or The power contacts of the high-voltage interlock connector are coupled to the high-voltage electrical equipment, and the power components of the mating connector are coupled to the high-voltage power supply.

9. A high-voltage interlock detection circuit (40), comprising: High-voltage interlock circuit (100) according to any one of claims 1 to 8; as well as A diagnostic circuit (41) is configured to detect the frequency of the frequency indication signal and, based on the frequency, determine the coupling state of each interlock detection contact in the at least one high-voltage interlock connector (131-a, 132-a, ..., 13N-a) with the interlock detection portion of the corresponding mating connector.

10. A high-voltage device (5a), comprising: The high-voltage interlock detection circuit (40) according to claim 9.

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