High-voltage interlocking detection circuit and device

Abstract

The utility model provides a high-voltage interlocking detection circuit and device, and relates to the field of fault detection, the high-voltage interlocking detection circuit comprises a first controllable switch, the control end of the first controllable switch is connected with a detection signal, and the first end of the first controllable switch is connected with the first end of a voltage dividing module and a first interlocking end; the first end of the first pull-up resistor is connected with the power supply, and the second end of the first pull-up resistor is connected with the first interlocking end and the first end of the voltage division module; and the controller, the first detection port and the second detection port are respectively connected with the first end and the second end of the voltage division module. The voltage dividing module generates a corresponding signal pair based on the current connection state of the first interlocking end and the second interlocking end, outputs the signal pair to the controlled first detection port and the controlled second detection port respectively, and changes the output of the first end and the second end of the voltage dividing module according to different types of detection signals. The controller determines whether the first interlocking end and the second interlocking end are short-circuited based on the signals received by the first detection end and the second detection end, multiple detections are combined by using one set of circuit, and the use process is more flexible.

Description

A high-voltage interlock detection circuit and device Technical Field

[0001] This utility model relates to the field of fault detection, and in particular to a high-voltage interlock detection circuit and device. Background Technology

[0002] The working principle of high-voltage interlock is mainly to use low-voltage signals to detect all high-voltage components connected to the high-voltage wiring harness on the electric vehicle, monitor the integrity of the electrical connections of each high-voltage system circuit, identify abnormal disconnections in the high-voltage circuit, and thus cut off the high-voltage power to the system, ensuring the integrity and safety of the electrical connections, thereby guaranteeing the normal operation of the electric vehicle and the safety of passengers. Specifically, high-voltage interlock detection checks whether the first and second ends of the interlock are connected. During the process of the electric vehicle connecting to high voltage, the high-voltage interlock has the following functions: 1. To detect looseness in the high-voltage circuit. When a looseness is detected, it provides an alarm message to the vehicle controller, allowing time for the vehicle to take response measures, avoiding loss of power due to high-voltage power failure, which would affect passenger safety; 2. To prevent high-voltage circuit failures. Before the electric vehicle connects to high voltage, the high-voltage interlock will detect whether the high-voltage circuit is normal. If an abnormality is detected, the electric vehicle will not connect to high voltage, thus avoiding high-voltage safety accidents caused by loose high-voltage connections. Related technologies in this field use DC source detection and PWM (Pulse Width Modulation) detection. DC source detection determines whether the interlock is engaged by measuring the voltage at the controller's output port and the voltage fed back after passing through the first and second terminals of the interlock. PWM detection, on the other hand, determines the interlock engagement by measuring the pulse width of the PWM signal at the controller's output port and the pulse width of the PWM signal fed back after passing through the first and second terminals of the interlock. However, DC source detection and PWM detection use two different circuits, which presents several challenges in general design and application. Summary of the Invention

[0003] The purpose of this invention is to provide a high-voltage interlock detection circuit and device. Depending on the type of detection signal, the voltage divider module changes the output of its first and second terminals. The controller determines whether the first and second interlock terminals are short-circuited based on the signals received by the first and second detection terminals. A single circuit combines multiple detection methods, making it more flexible in use.

[0004] To solve the above-mentioned technical problems, this utility model provides a high-voltage interlock detection circuit, comprising:

[0005] A first controllable switch, wherein the control terminal of the first controllable switch is connected to a detection signal, the first terminal of the first controllable switch is connected to the first terminal and the first interlock terminal of the voltage divider module, and the second terminal of the first controllable switch is connected to the first terminal of the first current limiting resistor, for turning on or off based on the detection signal;

[0006] The first current-limiting resistor has its second terminal grounded.

[0007] The first pull-up resistor has a first end connected to the power supply and a second end connected to the second end of the voltage divider module and the second interlock end.

[0008] The voltage divider module is used to generate a signal pair corresponding to the type of the detection signal based on the current connection state of the first interlock terminal and the second interlock terminal. The first terminal of the voltage divider module outputs the first signal in the signal pair, and the second terminal of the voltage divider module outputs the second signal in the signal pair.

[0009] The controller has a first detection port connected to the first end of the voltage divider module and a second detection port connected to the second end of the voltage divider module. The controller is used to determine whether to short-circuit based on the first signal, the second signal, and the type of the detection signal.

[0010] On the other hand, when the detection signal is a voltage signal, the voltage divider module includes a first voltage divider resistor;

[0011] The first end of the first voltage divider resistor is connected to the second end of the first pull-up resistor, and the second end of the first voltage divider resistor is connected to the first end of the first controllable switch.

[0012] The first voltage divider resistor is used to short-circuit when the first interlock terminal and the second interlock terminal are short-circuited. When the first interlock terminal and the second interlock terminal are not short-circuited, the voltage output by the power supply is divided at the first detection port and the second detection port of the controller to realize interlock detection.

[0013] On the other hand, when the detection signal is a PWM signal, the voltage divider module includes a third pull-up resistor and a first pull-down resistor;

[0014] The first end of the third pull-up resistor is connected to the power supply, the second end of the third pull-up resistor is connected to the first end of the first controllable switch, the first end of the first pull-down resistor is connected to the second end of the first pull-up resistor, and the second end of the first pull-down resistor is grounded.

[0015] The third pull-up resistor is used to pull up the voltage, and the first pull-down resistor is used to pull down the voltage.

[0016] On the other hand, the voltage divider module includes a first voltage divider resistor, a third pull-up resistor, a first pull-down resistor, a first control switch, a second control switch, and a third control switch;

[0017] The first end of the first voltage divider resistor is connected to the second end of the first pull-up resistor, the second end of the first voltage divider resistor is connected to the first end of the first controllable switch, the first end of the third pull-up resistor is connected to the power supply, the second end of the third pull-up resistor is connected to the first end of the first controllable switch, the first end of the first pull-down resistor is connected to the second end of the first pull-up resistor, and the second end of the first pull-down resistor is grounded.

[0018] The first control switch is located in the circuit where the first pull-down resistor is located, the second control switch is located in the circuit where the third pull-up resistor is located, and the third control switch is located in the circuit where the first voltage divider resistor is located.

[0019] The first control switch and the second control switch are configured to open when the detection signal is a voltage signal and close when the detection signal is a PWM signal, and the third control switch is configured to open when the detection signal is a PWM signal and close when the detection signal is a voltage signal.

[0020] On the other hand, it also includes a second pull-up resistor;

[0021] The first end of the second pull-up resistor is connected to the first end of the voltage divider module, and the second end of the second pull-up resistor is connected to the first end of the first controllable switch.

[0022] The second pull-up resistor is used to pull up the voltage.

[0023] On the other hand, it also includes a second current-limiting resistor;

[0024] The first end of the second current-limiting resistor is connected to the first detection port of the controller, and the second end of the second current-limiting resistor is connected to the first end of the voltage divider module;

[0025] The second current-limiting resistor is used to protect the first detection port of the controller.

[0026] On the other hand, it also includes a third current-limiting resistor;

[0027] The first end of the third current-limiting resistor is connected to the second detection port of the controller, and the second end of the third current-limiting resistor is connected to the second end of the voltage divider module;

[0028] The third current-limiting resistor is used to protect the second detection port of the controller.

[0029] On the other hand, it also includes a second controllable switch;

[0030] The control terminal of the second controllable switch is connected to the second terminal of the first controllable switch, the first terminal of the second controllable switch is connected to the control terminal of the first controllable switch, and the second terminal of the second controllable switch is grounded.

[0031] The second controllable switch is used for current limiting.

[0032] To solve the above-mentioned technical problems, this utility model also provides a high-voltage interlock detection device, including the high-voltage interlock detection circuit described above.

[0033] This application provides a high-voltage interlock detection circuit and device, relating to the field of fault detection. It includes a first controllable switch, whose control terminal is connected to a detection signal, and whose first terminal is connected to the first terminal of a voltage divider module and the first interlock terminal; a first pull-up resistor, whose first terminal is connected to a power supply, and whose second terminal is connected to the first interlock terminal and the first terminal of the voltage divider module; and a controller, whose first detection port and second detection port are respectively connected to the first and second terminals of the voltage divider module. The voltage divider module generates corresponding signal pairs based on the current connection state of the first and second interlock terminals, and outputs them to the first and second detection ports of the controller. Depending on the type of detection signal, the voltage divider module changes the output of its first and second terminals. The controller determines whether the first and second interlock terminals are short-circuited based on the signals received from the first and second detection terminals. This single circuit combines multiple detection methods, making it more flexible in use. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 is a schematic diagram of a high-voltage interlock detection circuit provided by this utility model;

[0036] Figure 2 is a schematic diagram of a high-voltage interlock detection circuit provided by this utility model, wherein the detection signal is a voltage signal;

[0037] Figure 3 is a schematic diagram of a high-voltage interlock detection circuit with a PWM signal as the detection signal provided by this utility model;

[0038] Figure 4 is a schematic diagram of another high-voltage interlock detection circuit provided by this utility model. Detailed Implementation

[0039] The core of this utility model is to provide a high-voltage interlock detection circuit and device. According to different types of detection signals, the voltage divider module changes the output of its first and second terminals. The controller determines whether the first interlock terminal and the second interlock terminal are short-circuited based on the signals received by the first and second detection terminals. A single circuit is used to combine multiple detections, making it more flexible in use.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] Figure 1 is a schematic diagram of a high-voltage interlock detection circuit provided by this utility model. The high-voltage interlock detection circuit includes:

[0042] The first controllable switch Q1 has a control terminal connected to a detection signal. The first terminal of the first controllable switch Q1 is connected to the first terminal of the voltage divider module 1 and the first interlock terminal. The second terminal of the first controllable switch Q1 is connected to the first terminal of the first current limiting resistor R1. It is used to turn on or off based on the detection signal.

[0043] The first current-limiting resistor R1 is grounded at its second terminal.

[0044] The first pull-up resistor R2 has its first end connected to the power supply and its second end connected to the second end of the voltage divider module 1 and the second interlock end.

[0045] Voltage divider module 1 is used to generate a signal pair corresponding to the type of the detection signal based on the current connection state of the first interlock terminal and the second interlock terminal. The first terminal of voltage divider module 1 outputs the first signal in the signal pair, and the second terminal of voltage divider module 1 outputs the second signal in the signal pair.

[0046] Controller 2 has a first detection port connected to the first end of voltage divider module 1 and a second detection port connected to the second end of voltage divider module 1. Controller 2 is used to determine whether to short-circuit based on the first signal, the second signal, and the type of the detection signal.

[0047] The working principle of high-voltage interlock is mainly to use low-voltage signals to detect all high-voltage components connected to the high-voltage wiring harness on the electric vehicle, monitor the integrity of the electrical connections of each high-voltage system circuit, identify abnormal disconnections in the high-voltage circuit, and thus cut off the high-voltage power of the system, ensuring the integrity and safety of the electrical connections, thereby guaranteeing the normal operation of the electric vehicle and the safety of passengers. During the process of connecting the electric vehicle to high voltage, the high-voltage interlock has the following functions: 1. Detecting looseness in the high-voltage circuit. When a looseness is detected, it provides an alarm message to the vehicle controller 2, allowing time for the vehicle to take response measures, preventing the vehicle from losing power due to a high-voltage power outage, thus affecting passenger safety; 2. Preventing high-voltage circuit failures. Before connecting the electric vehicle to high voltage, the high-voltage interlock will check whether the high-voltage circuit is normal. If an abnormality is detected, the electric vehicle will not connect to high voltage, thus avoiding high-voltage safety accidents caused by loose connections.

[0048] There are two main methods in the traditional design of high-voltage interlocks: DC source and pulse width modulation (PWM) scheme.

[0049] The basic principle of the DC power supply solution is to send a high-level or low-level signal to the detection unit through a hardware interface, while simultaneously detecting the potential of another interface in real time to determine whether the high-voltage interlock has been broken. If the signals do not match, the system will issue an alarm or take corresponding safety measures.

[0050] The advantages of DC source high-voltage interlocking are: relatively simple implementation, requiring no complex modulation and demodulation operations; fast response speed, allowing for timely detection of changes in the interlock status; and high reliability, making it suitable for most high-voltage interlocking scenarios.

[0051] Pulse Width Modulation (PWM) is another common high-voltage interlock detection method, employing different principles and technologies. The core idea of ​​the PWM method is to use pulse width modulation technology to send a signal and detect the duty cycle of the PWM signal in real time at another interface to determine whether the high-voltage interlock has been broken.

[0052] PWM signal generation: The detection unit generates a PWM signal through hardware circuitry. A PWM signal is a periodic square wave whose pulse width varies with the interlock state. Typically, the pulse width is larger when the interlock is open and smaller when the interlock is closed.

[0053] Duty cycle detection: Another interface is responsible for real-time detection of the duty cycle of the PWM signal, that is, the ratio of the pulse high-level time to the period;

[0054] Interlock status judgment: The microcontroller determines whether the high-voltage interlock is disconnected by comparing the value of the duty cycle detection interface with a predetermined threshold. If the duty cycle is lower than the threshold, the system will trigger safety measures.

[0055] The advantage is that the PWM scheme allows for more flexible signal transmission, representing different interlock states by adjusting the pulse width. It has high anti-interference capability, making it suitable for high-voltage interlock detection in noisy environments. It can easily implement interlocking in multiple states, such as partial interlocking or cascaded interlocking.

[0056] The voltage divider module of this application can combine two methods, allowing users to select the detection method according to their actual needs.

[0057] When the detected signal is a voltage signal, due to the presence of voltage divider module 1, a voltage drop will occur across voltage divider module 1. That is, as long as current flows through voltage divider module 1, the voltage at the first and second terminals of voltage divider module 1 will be different. This application utilizes this characteristic to detect whether the first interlock terminal and the second interlock terminal are connected. Specifically, the first interlock terminal is connected to the first terminal of voltage divider module 1, and the second interlock terminal is connected to the second terminal of voltage divider module 1. If the first and second interlock terminals are short-circuited, they can be considered as a wire, which will short-circuit voltage divider module 1. Consequently, the voltages across voltage divider module 1 will be the same, and the voltages of the first and second signals detected by the first and second detection ports will be the same. If the first and second interlock terminals are not short-circuited, current will flow through voltage divider module 1, resulting in a voltage drop across voltage divider module 1. The voltages of the first and second signals detected by the first and second detection ports will be different, thus indicating a fault.

[0058] When the detection signal is a PWM signal, if the first interlock terminal and the second interlock terminal are shorted, then the first signal and the second signal detected by the first detection port and the second detection port are the same, and both should detect the PWM signal. If the first interlock terminal and the second interlock terminal are not shorted, then the first signal and the second signal detected by the first detection port and the second detection port are different. The first detection port should detect the PWM signal with the same frequency as the detection signal, while the second detection port should detect the voltage after voltage division.

[0059] The first pull-up resistor R1 is a pull-up resistor for the interlock input, providing a high level for the interlock input, where the high level is the power supply voltage V. The first current-limiting resistor R2 is a loop current-limiting resistor to prevent excessive current flowing through the first controllable switch Q1, which could damage the first controllable switch Q1.

[0060] In summary, voltage divider module 1 provides multiple detection methods based on different detection signals, all of which can determine whether the first interlock terminal and the second interlock terminal are connected. Specifically, the first interlock terminal is the interlock input in Figure 1, and the second interlock terminal is the interlock output in Figure 1.

[0061] It should be noted that detecting faults by checking whether the signals input to the two detection terminals are identical is a conventional technique in this field, and this application does not impose any limitations on it here. The control signal can be output by the controller or by other detection devices. This application provides Figure 1 as an example of a multiplexed controller.

[0062] This application provides a high-voltage interlock detection circuit, relating to the field of fault detection. It includes a first controllable switch, whose control terminal is connected to a detection signal, and whose first terminal is connected to the first terminal of a voltage divider module and the first interlock terminal; a first pull-up resistor, whose first terminal is connected to a power supply, and whose second terminal is connected to the first interlock terminal and the first terminal of the voltage divider module; and a controller, whose first detection port and second detection port are respectively connected to the first and second terminals of the voltage divider module. The voltage divider module generates corresponding signal pairs based on the current connection state of the first and second interlock terminals, and outputs them to the first and second detection ports of the controller. Depending on the type of detection signal, the voltage divider module changes the output of its first and second terminals. The controller determines whether the first and second interlock terminals are short-circuited based on the signals received by the first and second detection terminals. This circuit combines multiple detection methods, making it more flexible in use.

[0063] Based on the above embodiments:

[0064] Figure 2 is a schematic diagram of a high-voltage interlock detection circuit provided by this utility model, wherein the detection signal is a voltage signal;

[0065] In some embodiments, when the detection signal is a voltage signal, the voltage divider module 1 includes a first voltage divider resistor R6;

[0066] The first end of the first voltage divider resistor R6 is connected to the second end of the first pull-up resistor R1, and the second end of the first voltage divider resistor R6 is connected to the first end of the first controllable switch Q1.

[0067] The first voltage divider resistor R6 is used to short-circuit when the first interlock terminal and the second interlock terminal are short-circuited. When the first interlock terminal and the second interlock terminal are not short-circuited, the voltage output by the power supply is divided between the first detection port and the second detection port of the controller 2 to realize interlock detection.

[0068] It should be noted that if the DC source solution can be determined during the design phase before leaving the factory, then the first voltage divider resistor R6 is a surface mount resistor, and the third pull-up resistor R7 and the first pull-down resistor R8 in Figure 3 are not surface mount.

[0069] When the interlocked output and input are not short-circuited, the control signal controls the first controllable switch Q1 to open. Then, the voltage U1 at the first detection port is:

[0070] ;

[0071] The voltage U2 at the second detection port is:

[0072] ;

[0073] The high-voltage interlock is identified as being in an open state if the voltages at the first and second detection ports are different.

[0074] When the interlocked output and input are shorted, the first voltage divider resistor R6 is shorted by the external interlock, and the control signal controls the first controllable switch Q1 to open. Then the voltage U1 at the first detection port is:

[0075] ;

[0076] The voltage U2 at the second detection port is:

[0077] ;

[0078] If the voltages at the first and second detection ports are equal, it can be determined that the high-voltage interlock is in a connected state.

[0079] Figure 3 is a schematic diagram of a high-voltage interlock detection circuit with a PWM signal as the detection signal provided by this utility model;

[0080] In some embodiments, when the detection signal is a PWM signal, the voltage divider module 1 includes a third pull-up resistor R7 and a first pull-down resistor R8;

[0081] The first end of the third pull-up resistor R7 is connected to the power supply, the second end of the third pull-up resistor R7 is connected to the first end of the first controllable switch Q1, the first end of the first pull-down resistor R8 is connected to the second end of the first pull-up resistor R1, and the second end of the first pull-down resistor R8 is grounded.

[0082] The third pull-up resistor R7 is used to pull up the voltage, and the first pull-down resistor R8 is used to pull down the voltage.

[0083] It should be noted that if the PWM scheme can be determined during the design phase before leaving the factory, then the third pull-up resistor R7 and the first pull-down resistor R8 are surface mount resistors, and the first voltage divider resistor R6 is not mounted.

[0084] When the interlocked output and input are not short-circuited, the first detection port detects a PWM signal, and the voltage signal U2 collected by the second detection port is:

[0085] ;

[0086] When the interlock output and input are shorted, the first detection port detects the PWM signal, and the second detection port also detects the PWM signal. At this time, it can be determined that the external high-voltage interlock signals are shorted together.

[0087] Furthermore, it can correctly identify two situations: high-voltage interlock output and input ground failure and power failure. When the external interlock is shorted to the power supply, the first detection port and the second detection port respectively collect level signals, which means that the external high-voltage interlock is shorted to the power supply, and the controller 2 promptly issues a power failure fault signal. When the external interlock is shorted to ground, the first detection port and the second detection port respectively collect low level signals, which means that the external high-voltage interlock is shorted to ground, and the controller 2 can promptly issue a ground failure fault signal.

[0088] Figure 4 is a schematic diagram of another high-voltage interlock detection circuit provided by this utility model;

[0089] In some embodiments, the voltage divider module includes a first voltage divider resistor R6, a third pull-up resistor R7, a first pull-down resistor R8, a first control switch K1, a second control switch K2, and a third control switch K3;

[0090] The first end of the first voltage divider resistor R6 is connected to the second end of the first pull-up resistor R1, the second end of the first voltage divider resistor R6 is connected to the first end of the first controllable switch Q1, the first end of the third pull-up resistor R7 is connected to the power supply, the second end of the third pull-up resistor R7 is connected to the first end of the first controllable switch Q1, the first end of the first pull-down resistor R8 is connected to the second end of the first pull-up resistor R1, and the second end of the first pull-down resistor R8 is grounded.

[0091] The first control switch K1 is set in the circuit where the first pull-down resistor R8 is located; the second control switch K2 is set in the circuit where the third pull-up resistor R7 is located; and the third control switch K3 is set in the circuit where the first voltage divider resistor R6 is located.

[0092] The first control switch K1 and the second control switch K2 are used to open when the detection signal is a voltage signal and close when the detection signal is a PWM signal. The third control switch K3 is used to open when the detection signal is a PWM signal and close when the detection signal is a voltage signal.

[0093] It should also be noted that the branch where the first voltage divider resistor R6 is located is the branch between points C and D, the branch where the third pull-up resistor R7 is located is the branch between points D and E, and the branch where the first pull-down resistor R8 is located is the branch between points A and B. This application provides a connection relationship between the first control switch K1, the second control switch K2, and the third control switch K3, as shown in Figure 4.

[0094] If the first voltage divider resistor R6, the third pull-up resistor R7, and the first pull-down resistor R8 are all in the circuit, then when the detection signal is a voltage signal, only the first voltage divider resistor R6 needs to work. At this time, the first control switch K1 and the second control switch K2 are disconnected, and the third control switch K3 is closed. Then the third pull-up resistor R7 and the first pull-down resistor R8 are not connected in the circuit, and only the first voltage divider resistor R6 exists in the circuit.

[0095] If the first voltage divider resistor R6, the third pull-up resistor R7, and the first pull-down resistor R8 are all in the circuit, then when the detection signal is a PWM signal, only the third pull-up resistor R7 and the first pull-down resistor R8 need to work. At this time, when the third control switch K3 is disconnected, the first voltage divider resistor R6 is not connected in the circuit, and only the third pull-up resistor R7 and the first pull-down resistor R8 exist in the circuit.

[0096] In some embodiments, a second pull-up resistor R3 is also included;

[0097] The first end of the second pull-up resistor R2 is connected to the first end of the voltage divider module 1, and the second end of the second pull-up resistor R3 is connected to the first end of the first controllable switch Q1.

[0098] The second pull-up resistor R3 is used to pull up the voltage.

[0099] When the detected signal is a PWM signal, a high-level signal is output.

[0100] In some embodiments, a second current-limiting resistor R4 is also included;

[0101] The first end of the second current-limiting resistor R4 is connected to the first detection port of the controller 2, and the second end of the second current-limiting resistor R4 is connected to the first end of the voltage divider module 1.

[0102] The second current-limiting resistor R4 is used to protect the first detection port of controller 2.

[0103] To protect the sampling port of controller 2, a second current-limiting resistor R4 is connected before the first detection port to limit the current.

[0104] In some embodiments, a third current-limiting resistor R5 is also included;

[0105] The first end of the third current-limiting resistor R5 is connected to the second detection port of the controller 2, and the second end of the third current-limiting resistor R5 is connected to the second end of the voltage divider module 1.

[0106] The third current-limiting resistor R5 is used to protect the second detection port of controller 2.

[0107] To protect the sampling port of controller 2, a third current-limiting resistor is connected before the second detection port to limit the current.

[0108] In some embodiments, a second controllable switch Q2 is also included;

[0109] The control terminal of the second controllable switch Q2 is connected to the second terminal of the first controllable switch Q1, the first terminal of the second controllable switch Q2 is connected to the control terminal of the first controllable switch Q1, and the second terminal of the second controllable switch Q2 is grounded.

[0110] The second controllable switch Q2 is used for current limiting.

[0111] To prevent excessive current from flowing through the second pull-up resistor R2 and the first controllable switch Q1 when the interlocked output is short-circuited.

[0112] This application also provides a high-voltage interlock detection device, including the high-voltage interlock detection circuit described above.

[0113] Please refer to the above embodiments for a description of the high-voltage interlock detection device provided in this application, and it will not be repeated here.

[0114] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0115] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

[0116] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage interlock detection circuit, characterized in that, include: A first controllable switch, wherein the control terminal of the first controllable switch is connected to a detection signal, the first terminal of the first controllable switch is connected to the first terminal and the first interlock terminal of the voltage divider module, and the second terminal of the first controllable switch is connected to the first terminal of the first current limiting resistor, for turning on or off based on the detection signal; The first current-limiting resistor has its second terminal grounded; the first pull-up resistor has its first terminal connected to a power supply and its second terminal connected to the second terminal and the second interlock terminal of the voltage divider module; the voltage divider module is used to generate a signal pair corresponding to the type of the detection signal based on the current connection state of the first interlock terminal and the second interlock terminal, the first terminal of the voltage divider module outputs the first signal in the signal pair, and the second terminal of the voltage divider module outputs the second signal in the signal pair; the controller has its first detection port connected to the first terminal of the voltage divider module and its second detection port connected to the second terminal of the voltage divider module, and the controller is used to determine whether to short-circuit based on the first signal, the second signal, and the type of the detection signal.

2. The high-voltage interlock detection circuit as described in claim 1, characterized in that, When the detection signal is a voltage signal, the voltage divider module includes a first voltage divider resistor; the first end of the first voltage divider resistor is connected to the second end of the first pull-up resistor, and the second end of the first voltage divider resistor is connected to the first end of the first controllable switch; the first voltage divider resistor is used to be short-circuited when the first interlock terminal and the second interlock terminal are short-circuited, and when the first interlock terminal and the second interlock terminal are not short-circuited, the voltage output by the power supply is divided at the first detection port of the controller and the second detection port of the controller to realize interlock detection.

3. The high-voltage interlock detection circuit as described in claim 1, characterized in that, When the detection signal is a PWM signal, the voltage divider module includes a third pull-up resistor and a first pull-down resistor; the first end of the third pull-up resistor is connected to the power supply, the second end of the third pull-up resistor is connected to the first end of the first controllable switch, the first end of the first pull-down resistor is connected to the second end of the first pull-up resistor, and the second end of the first pull-down resistor is grounded; the third pull-up resistor is used to pull up the voltage, and the first pull-down resistor is used to pull down the voltage.

4. The high-voltage interlock detection circuit as described in claim 1, characterized in that, The voltage divider module includes a first voltage divider resistor, a third pull-up resistor, a first pull-down resistor, a first control switch, a second control switch, and a third control switch. The first end of the first voltage divider resistor is connected to the second end of the first pull-up resistor, and the second end of the first voltage divider resistor is connected to the first end of the first controllable switch. The first end of the third pull-up resistor is connected to a power supply, and the second end of the third pull-up resistor is connected to the first end of the first controllable switch. The first end of the first pull-down resistor is connected to the second end of the first pull-up resistor, and the second end of the first pull-down resistor is grounded. The first control switch is located in the circuit containing the first pull-down resistor, the second control switch is located in the circuit containing the third pull-up resistor, and the third control switch is located in the circuit containing the first voltage divider resistor. The first and second control switches are used to open when the detected signal is a voltage signal and close when the detected signal is a PWM signal. The third control switch is used to open when the detected signal is a PWM signal and close when the detected signal is a voltage signal.

5. The high-voltage interlock detection circuit as described in claim 1, characterized in that, It also includes a second pull-up resistor; the first end of the second pull-up resistor is connected to the first end of the voltage divider module, and the second end of the second pull-up resistor is connected to the first end of the first controllable switch; the second pull-up resistor is used to pull up the voltage.

6. The high-voltage interlock detection circuit as described in claim 1, characterized in that, It also includes a second current-limiting resistor; the first end of the second current-limiting resistor is connected to the first detection port of the controller, and the second end of the second current-limiting resistor is connected to the first end of the voltage divider module; the second current-limiting resistor is used to protect the first detection port of the controller.

7. The high-voltage interlock detection circuit as described in claim 1, characterized in that, It also includes a third current-limiting resistor; the first end of the third current-limiting resistor is connected to the second detection port of the controller, and the second end of the third current-limiting resistor is connected to the second end of the voltage divider module; the third current-limiting resistor is used to protect the second detection port of the controller.

8. The high-voltage interlock detection circuit as described in any one of claims 1 to 7, characterized in that, It also includes a second controllable switch; the control terminal of the second controllable switch is connected to the second terminal of the first controllable switch, the first terminal of the second controllable switch is connected to the control terminal of the first controllable switch, and the second terminal of the second controllable switch is grounded; the second controllable switch is used for current limiting.

9. A high-voltage interlock detection device, characterized in that, Includes the high-voltage interlock detection circuit as described in any one of claims 1 to 8.

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