CN114347790B - High-voltage interlocking detection circuit and electronic equipment - Google Patents

Abstract

The embodiment of the application discloses a high-voltage interlocking detection circuit and electronic equipment, wherein the circuit comprises a processing module, a first comparator, a second comparator, a control module and a reference power supply module, wherein: the processing module is respectively coupled with the output end of the first comparator, the output end of the second comparator and the first end of the control module, the second end of the control module is coupled with the first input end of the second comparator, the first input end of the first comparator and the first input end of the second comparator are respectively coupled with the high-voltage loop, and the reference power supply module is respectively coupled with the second input end of the first comparator and the second input end of the second comparator; the processing module is used for controlling the control module to generate PWM signals, detecting a first signal output by the first comparator and a second signal output by the second comparator, and determining the state of the high-voltage loop according to the first signal and the second signal. By implementing the embodiment of the application, the state of the high-voltage loop can be accurately detected.

Description

A high-voltage interlock detection circuit and electronic equipment

Technical field

Embodiments of the present invention relate to the field of electronic circuit technology, and in particular, to a high-voltage interlock detection circuit and electronic equipment.

Background technique

Since electric vehicles have less impact on the environment than traditional vehicles, they have developed rapidly. With the rapid development of electric vehicle technology, the popularization of electric vehicles has become the future development direction. As an important function to detect the status of the high-voltage circuit of electric vehicles, high-voltage interlock plays a decisive role in ensuring the personal safety of maintenance personnel. Therefore, how to accurately detect the status of the high-voltage circuit has become an urgent technical problem that needs to be solved.

Contents of the invention

Embodiments of the present invention disclose a high-voltage interlock detection circuit and electronic equipment for accurately detecting the status of a high-voltage circuit.

The first aspect discloses a high-voltage interlock detection circuit, including a processing module, a first comparator, a second comparator, a control module and a reference power module, wherein: the processing module is coupled to the output end of the first comparator respectively. , the output end of the second comparator and the first end of the control module, the second end of the control module is coupled to the first input end of the second comparator, the first end of the first comparator The input terminal and the first input terminal of the second comparator are respectively coupled to a high-voltage circuit, and the reference power module is coupled to the second input terminal of the first comparator and the second input terminal of the second comparator respectively; The processing module is used to control the control module to generate a pulse width modulation (pulse width modulation, PWM) signal, detect the first signal output by the first comparator and the second signal output by the second comparator, according to The first signal and the second signal determine the status of the high voltage circuit.

The high-voltage interlock detection circuit disclosed in the embodiment of the present invention can control the control module to generate a PWM signal through the processing module, detect the first signal output by the first comparator and the second signal output by the second comparator, and detect the first signal output by the first comparator and the second signal output by the second comparator. The second signal determines the status of the high-voltage circuit. Since the PWM signal has strong anti-interference ability, it can avoid the problem of inaccurate detection caused by interference, etc., and thus can accurately detect the status of the high-voltage circuit.

As a possible implementation, the processing module determining the state of the high-voltage circuit according to the first signal and the second signal includes: when the first signal and the second signal are both PWM signals , the processing module determines that the high-voltage circuit is in a normal state; when the first signal is high level and the second signal is low level, the processing module determines that the high-voltage circuit is in an open circuit state; when the When the first signal and the second signal are both high level, the processing module determines that the high voltage loop is in a short power supply state; when the first signal and the second signal are both low level, the processing module The processing module determines that the high-voltage circuit is in a short-to-ground condition.

In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the first signal output by the first comparator and the second signal output by the second comparator can be a PWM signal, a high level, or a low level. . Therefore, according to the signals output by the two comparators, the state of the high-voltage circuit can be determined, that is, normal state, open circuit state, short power state or short ground state. In the case of a fault in the high-voltage circuit, the fault of the high-voltage circuit can be determined. Type, that is, open circuit, short power supply or short ground, so that maintenance personnel can perform maintenance accordingly according to the fault type, thereby improving maintenance efficiency. It can be seen that the state of the high-voltage circuit can be accurately determined, and thus the state of the high-voltage circuit can be accurately detected. In addition, the state of the high-voltage circuit can not only be a normal state or an open circuit state, but also a short power state or a short ground state. There are many states of the high-voltage circuit that can be detected, which can further improve the accuracy of high-voltage circuit state detection. Furthermore, when a fault occurs in the high-voltage circuit, the fault type of the high-voltage circuit can be accurately determined, thereby improving the accuracy of fault detection. Furthermore, the fault type can not only be an open circuit, but also a short power supply or a short ground. There are many fault types that can be detected, which can further improve the accuracy of fault type detection.

As a possible implementation, the circuit further includes a power module, wherein: the power module is coupled to the first input end of the first comparator; and the power module is used to supply power to the circuit where the control module is located. .

In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the power module can supply power to the circuit where the control module is located, so that the control module can operate normally. In addition, the two comparators can also be powered so that the first comparator and the second comparator can operate normally, thereby accurately detecting the status of the high-voltage circuit.

As a possible implementation manner, the power module includes a first power supply and a first resistor, wherein the first power supply is coupled to the first input end of the first comparator through the first resistor.

As a possible implementation manner, the reference power module is used to provide a reference voltage for the first comparator and the second comparator.

In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the reference power module can provide a reference voltage for the first comparator and the second comparator, so that the first comparator and the second comparator can compare the reference voltage with the voltage at the other input terminal. Comparison is performed, and different signals can be output according to different comparison results, which can ensure the normal operation of the first comparator and the second comparator, so that the status of the high-voltage circuit can be accurately detected.

As a possible implementation, the reference power module includes a second power supply, wherein: the second power supply is coupled to the second input terminal of the first comparator and the second input terminal of the second comparator respectively. .

In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the reference power module can only include one power supply. The reference voltages of the first comparator and the second comparator can be provided by this power supply, which can ensure that the reference voltages of the two comparators are the same. . In addition, since the reference voltage can be provided for two comparators through one power supply, the number of devices in the circuit can be reduced, thereby reducing the complexity, area, and cost of the circuit.

As a possible implementation, the power module further includes a second resistor and a third resistor, wherein: one end of the second resistor is coupled to the second power supply, and one end of the third resistor is coupled to the ground terminal. The other end of the second resistor is coupled to the other end of the third resistor, the second input end of the first comparator and the second input end of the second comparator respectively.

As a possible implementation, the control module includes a switching device, wherein: the first terminal of the switching device is coupled to the first input terminal of the second comparator, and the second terminal of the switching device is coupled to the ground terminal. , the third terminal of the switching device is coupled to the processing module.

In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the control module may include a switching device, which is a controllable switching device, so that the processing module can generate a PWM signal by controlling the on or off of the switching device, and then The status of the high-voltage circuit can be detected based on the PWM signal, so that the status of the high-voltage circuit can be accurately detected.

As a possible implementation, the control module further includes a fourth resistor, wherein two ends of the fourth resistor are respectively coupled to the first end of the switching device and the first input end of the first comparator. .

In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the control module may also include a resistor, through which the current flowing through the switching device can be limited, thereby protecting the switching device.

As a possible implementation, the reference power supply module includes a third power supply and a fourth power supply, wherein: the third power supply is coupled to the second input end of the first comparator, and the fourth power supply is coupled to the The second input of the second comparator.

In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the reference power module can include two power supplies. The reference voltages of the first comparator and the second comparator can be provided by these two power supplies respectively, which can ensure the reference of the two comparators. The voltage is different.

As a possible implementation, the power module further includes a fifth resistor and a sixth resistor, wherein: one end of the fifth resistor is coupled to the third power supply, and one end of the sixth resistor is coupled to the ground terminal. The other end of the fifth resistor is coupled to the other end of the sixth resistor and the second input end of the first comparator respectively.

As a possible implementation, the power module further includes a seventh resistor and an eighth resistor, wherein: one end of the seventh resistor is coupled to the fourth power supply, and one end of the eighth resistor is coupled to the ground terminal. The other end of the seventh resistor is coupled to the other end of the eighth resistor and the second input end of the second comparator respectively.

The second aspect discloses an electronic device, which at least includes a high-voltage circuit, and the high-voltage interlock detection circuit disclosed in the above-mentioned first aspect or any possible implementation of the first aspect, wherein:

The high-voltage circuit is coupled to the high-voltage interlock detection circuit.

Description of the drawings

Figure 1 is a schematic structural diagram of a high-voltage interlock detection circuit disclosed in an embodiment of the present invention;

Figure 2 is a schematic structural diagram of another high-voltage interlock detection circuit disclosed in an embodiment of the present invention;

Figure 3 is a schematic structural diagram of yet another high-voltage interlock detection circuit disclosed in an embodiment of the present invention;

Figure 4 is a schematic diagram of determining the state of a high-voltage circuit based on a first signal and a second signal disclosed in an embodiment of the present invention;

Figure 5 is a schematic structural diagram of yet another high-voltage interlock detection circuit disclosed in an embodiment of the present invention;

Figure 6 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present invention.

Detailed ways

Embodiments of the present invention disclose a high-voltage interlock detection circuit and electronic equipment for accurately detecting the status of a high-voltage circuit. The embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

The terms “first”, “second”, “third” and “fourth” in the description, claims and drawings of the present invention are used to distinguish different objects, rather than describing a specific sequence. Furthermore, the terms "include," "have," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process that includes a series of steps or modules is not limited to the steps or modules that have been listed, but optionally also includes steps or modules that are not listed, or optionally includes other steps or modules that are inherent to these processes or devices. steps or modules.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

It should be understood that "coupling" in the present invention can be understood as direct coupling, that is, direct connection (ie, electrical connection); it can also be understood as indirect coupling, that is, indirect connection, that is, connection through other devices, components, modules, etc.

In order to better understand the high-voltage interlock detection circuit and electronic equipment disclosed in the embodiments of the present invention, the relevant technology is first described below.

Please refer to FIG. 1 , which is a schematic structural diagram of a high-voltage interlock detection circuit disclosed in an embodiment of the present invention. As shown in Figure 1, the high-voltage interlock detection circuit may include a high-voltage component control module and an electromagnetic compatibility (EMC) filter, where:

The output end of the high-voltage component control module is coupled to the first end of the EMC filter, the input end of the high-voltage component control module is coupled to the second end of the EMC filter, and the third and fourth ends of the EMC filter are coupled to the high-voltage circuit respectively.

The high-voltage component control module can generate a constant voltage signal, and the voltage value of this voltage signal is the first value. The signal flow of this voltage signal is high-voltage component control module-EMC filter-high-voltage circuit-EMC filter-high-voltage component control module. The high-voltage component control module detects the voltage value of the collected signal, that is, the second value. Then it can determine whether the first value and the second value are the same. When it is determined that the second value is different from the first value, it can be determined that there is a fault in the high-voltage circuit. .

In the above-mentioned high-voltage interlock detection circuit, the signal used to detect the high-voltage circuit is a single voltage signal and is an analog signal, which has poor anti-interference ability and cannot accurately detect the status of the high-voltage circuit.

Please refer to FIG. 2 , which is a schematic structural diagram of another high-voltage interlock detection circuit disclosed in an embodiment of the present invention. As shown in Figure 2, the high-voltage interlock detection circuit may include a processing module, a first comparator C1, a second comparator C2, a control module and a reference power module, where:

The first end of the processing module is coupled to the output end of the first comparator C1, the second end of the processing module is coupled to the output end of the second comparator C2, the third end of the processing module is coupled to the first end of the control module, and the third end of the control module The first input terminal of the second comparator C2 is two-terminal coupled, the first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 are respectively coupled to two ends of the high-voltage circuit, and the reference power module is coupled to the first input terminal of the second comparator C2. a second input terminal of the comparator C1 and a second input terminal of the second comparator C2;

The processing module is used to control the control module to generate a PWM signal, detect the first signal output by the first comparator C1 and the second signal output by the second comparator C2, and determine the state of the high-voltage circuit based on the first signal and the second signal.

The processing module can generate a control signal, and then the working state of the control module can be controlled according to the control signal, so that the control module can generate a PWM signal. The control signal may be a PWM signal. The working state of the control module can include two states, namely working state and non-working state.

The first comparator C1 can determine the voltage of the first input terminal of the first comparator C1 through a circuit composed of a high-voltage circuit and a control module. Correspondingly, the second comparator C2 can also determine the voltage of the first input terminal of the second comparator C2 through a circuit composed of a high-voltage circuit and a control module. Then the first comparator C1 can compare the voltage of the first input terminal with the voltage of the second input terminal provided by the reference power module, and determine the first signal output by the first comparator C1 according to the comparison result. Correspondingly, the second comparator C2 can compare the voltage of the first input terminal with the voltage of the second input terminal provided by the reference power module, and determine the second signal output by the second comparator C2 according to the comparison result.

One of the two input terminals of the comparator inputs the reference voltage, and the other terminal inputs the analog voltage signal. The first input terminals of the first comparator C1 and the second comparator C2 input an analog voltage signal, and the second input terminals of the first comparator C1 and the second comparator C2 input a reference voltage.

The processing module can detect the first signal output by the first comparator C1 and the second signal output by the second comparator C2, and then determine the state of the high-voltage circuit based on the first signal and the second signal. The processing module may include a microcontroller.

The first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 are respectively coupled to the two ends of the high-voltage circuit. It can be understood that the first input terminal of C1 and the first input terminal of C2 are not directly connected to the high-voltage circuit. The circuit is connected to the high-voltage circuit through the low-voltage interface of the high-voltage circuit.

Please refer to FIG. 3 , which is a schematic structural diagram of yet another high-voltage interlock detection circuit disclosed in an embodiment of the present invention. Among them, the high-voltage interlock detection circuit shown in Figure 3 is optimized from the high-voltage interlock detection circuit shown in Figure 2.

In one embodiment, the processing module determining the status of the high-voltage circuit based on the first signal and the second signal may include:

When the first signal and the second signal are both PWM signals, the processing module determines that the high-voltage circuit is in a normal state;

When the first signal is high level and the second signal is low level, the processing module determines that the high voltage circuit is in an open circuit state;

When both the first signal and the second signal are high level, the processing module determines that the high voltage loop is in a short power state;

When both the first signal and the second signal are low level, the processing module determines that the high voltage loop is in a short-to-ground state.

When the input voltage at the first input terminal of the first comparator C1 is greater than the input voltage at the second input terminal, the output of the first comparator is high level, and the input voltage at the first input terminal of the first comparator C1 is less than the second input voltage. In the case of input voltage at the input terminal, the first comparator output is low level. Correspondingly, when the input voltage of the first input terminal of the second comparator C2 is greater than the input voltage of the second input terminal, the output of the second comparator is high level, and the input voltage of the first input terminal of the second comparator C2 When the input voltage is less than the input voltage of the second input terminal, the output of the second comparator is low level.

In one embodiment, the circuit high-voltage interlock detection may also include a power module, where:

The power module is coupled to the first input end of the first comparator;

The power module is used to power the circuit where the control module is located.

In one embodiment, the power module may include a first power supply P1 and a first resistor R1, where:

The first power supply P1 is coupled to the first input terminal of the first comparator C1 through the first resistor R1.

The first power supply P1 can power the circuit where the first resistor R1 is located, that is, the circuit composed of R1, a high-voltage circuit and a control module. In addition, the first power supply P1 can also supply power to the first comparator C1 and the second comparator C2, that is, the first power supply P1 is coupled to the power supply terminal of the first comparator C1 and the power supply terminal of the second comparator C2 respectively.

In some embodiments, the reference power module is used to provide a reference voltage for the first comparator C1 and the second comparator C2.

In one embodiment, the reference power module may include a second power supply P2, where:

The second power supply is coupled to the second input terminal of the first comparator C1 and the second input terminal of the second comparator C2 respectively.

The power supply value of the first power supply P1 and the power supply value of the second power supply P2 may be the same or different. The second power supply P2 can ensure that the first comparator C1 and the second comparator C2 have the same reference voltage.

In one embodiment, the power module may further include a second resistor R2 and a third resistor R3, where:

One end of the second resistor R2 is coupled to the second power supply P2, one end of the third resistor R3 is coupled to the ground terminal, and the other end of the second resistor R2 is coupled to the other end of the third resistor R3, the second input end of the first comparator C1 and The second input terminal of the second comparator C2.

In one case, the first power supply P1 and the second power supply P2 may be the same power supply, that is, the power module may be used to supply power to the reference power module. At this time, the reference power module may only include the second resistor R2 and the third resistor R3, but not the second power supply P2. One end of the second resistor R2 is coupled to the first power supply P1.

The second resistor R2 and the third resistor R3 have the functions of current limiting and voltage dividing.

In one embodiment, the control module may include switching device Q1, where:

The first terminal of the switching device Q1 is coupled to the first input terminal of the second comparator C2, the second terminal of the switching device Q1 is coupled to the ground terminal, and the third terminal of the switching device Q1 is coupled to the processing module.

In one embodiment, the control module may further include a fourth resistor R4, where:

Two ends of the fourth resistor R4 are respectively coupled to the first end of the switching device Q1 and the first input end of the first comparator C1.

The fourth resistor R4 has the functions of current limiting and voltage dividing. The switching device Q1 is a controllable switching device, which can be a metal oxide semiconductor (MOS) tube, a triode, or other controllable three-terminal controllable device. When the switching device Q1 is a MOS tube, the gate of the switching device Q1 is coupled to the processing module. When the switching device Q1 is a transistor, the base of the switching device Q1 is coupled to the processing module. The processing module can control the control module by controlling the switching device Q1.

The following describes the working principle of the high-voltage interlock detection circuit in detail:

When the high-voltage loop connection is normal: When the processing module controls the switching device Q1 to be turned on, the first power supply P1, the high-voltage loop, the first resistor R1, the fourth resistor R4 and the switching device Q1 form a loop, that is, in the first control module When in working condition, the power module, high-voltage circuit and control module form a circuit. The input voltage of the first input terminal of the first comparator C1 is the same as the input voltage of the first input terminal of the second comparator C2. The input voltage of the first input terminal of the first comparator C1 can be expressed as follows:

Among them, REF is the input voltage of the first input terminal of the first comparator C1, _V1 is the voltage of the first power supply P1, _Re1 is the resistance of the first resistor R1, and _Re4 is the resistance of the fourth resistor R4. It can be seen from the above formula that when the resistance values of the first resistor R1 and the fourth resistor R4 are the same, the input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are both V ₁ /2, that is, half of the voltage of the first power supply P1. For example, when the voltage of the first power supply P1 is 12V, the input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are 6V. When there is no fourth resistor R4, that is, when the resistance of the fourth resistor R4 is 0, the input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are both 0.

When the processing module controls the switching device Q1 to turn off, the first power supply P1, the high-voltage circuit, the first resistor R1, the fourth resistor R4 and the switching device Q1 cannot form a loop, that is, when the first control module is in a non-working state. Under this condition, the power module, high-voltage circuit and control module cannot form a circuit. The input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are the voltage V ₁ of the first power supply P1. For example, when the voltage of the first power supply P1 is 12V, the input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are 12V.

In order to ensure that the first comparator C1 and the second comparator C2 can operate normally, the input voltage of the second input terminal of the first comparator C1 and the input voltage of the second input terminal of the second comparator C2 are at (or 0) and _V1 . For example, when the voltage of the first power supply P1 is 12V, the input voltage of the second input terminal of the first comparator C1 and the input voltage of the second input terminal of the second comparator C2 are values between 6(0)V and 12V. . When the processing module controls the switching device Q1 to turn on, the outputs of the first comparator C1 and the second comparator C1 are both low level; when the processing module controls the switching device Q1 to turn off, the first comparator C1 and the output of the second comparator C1 are both high level. It can be seen that when the high-voltage circuit is connected normally, both the first signal and the second signal are PWM signals.

When the high-voltage loop is open: when the processing module controls the switching device Q1 to be turned on, the first power supply P1, the high-voltage loop, the first resistor R1, the fourth resistor R4 and the switching device Q1 cannot form a loop. The input voltage of the first input terminal of the first comparator C1 is V ₁ , and the input voltage of the first input terminal of the second comparator C2 is 0. The output of the first comparator C1 is high level, and the output of the second comparator C2 is low level.

When the processing module controls the switching device Q1 to turn off, the first power supply P1, the high-voltage circuit, the first resistor R1, the fourth resistor R4 and the switching device Q1 cannot form a loop. The input voltage of the first input terminal of the first comparator C1 is V ₁ , and the input voltage of the first input terminal of the second comparator C2 is 0. The output of the first comparator C1 is high level, and the output of the second comparator C2 is low level.

When the high-voltage loop is short to the power supply (that is, shorted to the power supply): regardless of whether the processing module controls the switching device Q1 to be turned on or off, the input voltage of the first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 Both are V ₁ , and the outputs of the first comparator C1 and the second comparator C2 are both high level.

When the high-voltage circuit is short to ground (that is, short to ground): regardless of whether the processing module controls the switching device Q1 to be turned on or off, the inputs of the first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 The voltages are all 0, and the outputs of the first comparator C1 and the second comparator C2 are both low level.

From the above analysis, it can be seen that the relationship between the first signal, the second signal and the state of the high-voltage circuit can be shown in Table 1:

first signal PWM signal high level high level low level second signal PWM signal low level high level low level High voltage circuit status normal open circuit short power supply short ground

Table 1

As shown in Table 1, when the high-voltage circuit connection is normal, the first signal output by the first comparator C1 and the second signal output by the second comparator C2 are both PWM signals. When the high-voltage circuit is open, the first signal output by the first comparator C1 is a high level, and the second signal output by the second comparator C2 is a third level. When the high-voltage circuit has a short power supply, both the first signal output by the first comparator C1 and the second signal output by the second comparator C2 are high level. When the high-voltage circuit is short to ground, the first signal output by the first comparator C1 and the second signal output by the second comparator C2 are both low level.

Please refer to Figure 4. Figure 4 is a schematic diagram of determining the state of a high-voltage circuit based on a first signal and a second signal disclosed in an embodiment of the present invention. As shown in Figure 4, the processing module can determine the state of the high-voltage circuit based on the detected first signal and the second signal.

In electronic equipment such as automobiles, the low-voltage interface directly connected to the high-voltage circuit has a large number of ground wires and power wires. Short ground and short power supply situations often occur at low-voltage interfaces, so the high-voltage interlock circuit can accurately determine this. The two fault types are particularly important so that maintenance personnel can adopt different maintenance methods for different fault types.

Please refer to FIG. 5 , which is a schematic structural diagram of yet another high-voltage interlock detection circuit disclosed in an embodiment of the present invention. Among them, the high-voltage interlock detection circuit shown in Figure 5 is optimized from the high-voltage interlock detection circuit shown in Figure 2.

In one embodiment, the processing module determining the status of the high-voltage circuit based on the first signal and the second signal may include:

When the first signal and the second signal are both PWM signals, the processing module determines that the high-voltage circuit is in a normal state;

When the first signal is high level and the second signal is low level, the processing module determines that the high voltage circuit is in an open circuit state;

When both the first signal and the second signal are high level, the processing module determines that the high voltage loop is in a short power state;

When both the first signal and the second signal are low level, the processing module determines that the high voltage loop is in a short-to-ground state.

In one embodiment, the circuit high-voltage interlock detection may also include a power module, where:

The power module is coupled to the first input end of the first comparator;

The power module is used to power the circuit where the control module is located.

In one embodiment, the power module may include a first power supply P1 and a first resistor R1, where:

The first power supply P1 is coupled to the first input terminal of the first comparator C1 through the first resistor R1.

In some embodiments, the reference power module is used to provide a reference voltage for the first comparator C1 and the second comparator C2.

In one embodiment, the reference power module includes a third power supply P3 and a fourth power supply P4, where:

The third power supply P3 is coupled to the second input terminal of the first comparator C1, and the fourth power supply P4 is coupled to the second input terminal of the second comparator C2.

The voltages of the third power supply P3 and the fourth power supply P4 may be the same or different. When the voltages of the third power supply P3 and the fourth power supply P4 are the same, the third power supply P3 and the fourth power supply P4 can be combined into one power supply, as shown in FIG. 3 . When the voltages of the third power supply P3 and the fourth power supply P4 are different, different reference voltages may be provided for the first comparator C1 and the second comparator C2. However, in order to ensure that the first comparator C1 and the second comparator C2 can operate normally, the input voltage of the second input terminal of the first comparator C1 and the input voltage of the second input terminal of the second comparator C2 are both at (or 0) and V ₁ .

In one embodiment, the power module may further include a fifth resistor R5 and a sixth resistor R6, where:

One end of the fifth resistor R5 is coupled to the third power supply P3, one end of the sixth resistor R6 is coupled to the ground terminal, and the other end of the fifth resistor R5 is coupled to the other end of the sixth resistor R6 and the second input end of the first comparator C2 respectively.

In one embodiment, the power module may further include a seventh resistor R7 and an eighth resistor R8, where:

One end of the seventh resistor R7 is coupled to the fourth power supply P4, one end of the eighth resistor R8 is coupled to the ground terminal, and the other end of the seventh resistor R7 is coupled to the other end of the eighth resistor R8 and the second input end of the second comparator C2 respectively.

Among them, the sixth resistor R6 and the eighth resistor R8 can be combined into one resistor. When the voltages of the third power supply P3 and the fourth power supply P4 are the same and the sixth resistor R6 and the eighth resistor R8 are combined into one resistor, the resistance values of the fifth resistor R5 and the seventh resistor R7 are different.

In one embodiment, the control module may include switching device Q1, where:

The first terminal of the switching device Q1 is coupled to the first input terminal of the second comparator C2, the second terminal of the switching device Q1 is coupled to the ground terminal, and the third terminal of the switching device Q1 is coupled to the processing module.

In one embodiment, the control module may further include a fourth resistor R4, where:

Two ends of the fourth resistor R4 are respectively coupled to the first end of the switching device Q1 and the first input end of the first comparator C1.

Among them, Figure 3 is the same as Figure 5 in other aspects. The difference lies in the structure of the reference power module. For detailed description, please refer to the relevant description corresponding to Figure 3.

Please refer to FIG. 6 , which is a schematic structural diagram of an electronic device disclosed in an embodiment of the present invention. As shown in Figure 6, the electronic device may include a high-voltage loop and a high-voltage interlock detection circuit, where:

The two ends of the high-voltage interlock detection circuit are respectively coupled to the two ends of the high-voltage circuit.

In one embodiment, the electronic device may further include a separate device, wherein:

Discrete devices are coupled to the high voltage interlock detection circuit and/or the high voltage loop.

The separate device may be one or more of a processor, a memory, a display screen, a camera, an audio module, a communication module, a sensor, etc.

Among them, the coupling method of the high-voltage interlock detection circuit and the high-voltage loop, and the detailed description of the high-voltage interlock detection circuit and the high-voltage loop can refer to the corresponding descriptions in Figures 2, 3, and 5.

It should be understood that in addition to being applied in the automotive field, the present invention can also be applied to other fields that use high voltage, such as energy storage power stations.

The above-described specific embodiments further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope: Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solution of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. A high-voltage interlock detection circuit, characterized in that it includes a processing module, a first comparator, a second comparator, a control module and a reference power module, wherein: The processing module is respectively coupled to the output end of the first comparator, the output end of the second comparator and the first end of the control module. The second end of the control module is coupled to the second comparator. The first input terminal of the first comparator and the first input terminal of the second comparator are respectively coupled to the high-voltage circuit, and the reference power module is coupled to the second input terminal of the first comparator respectively. input terminal and the second input terminal of the second comparator; The processing module is used to control the control module to generate a pulse width modulation PWM signal, detect the first signal output by the first comparator and the second signal output by the second comparator, according to the first signal and the second signal determines the status of the high voltage circuit; When the first signal and the second signal are both PWM signals, the processing module determines that the high-voltage circuit is in a normal state; When the first signal is high level and the second signal is low level, the processing module determines that the high voltage loop is in an open circuit state; When both the first signal and the second signal are high level, the processing module determines that the high-voltage circuit is in a short power state; When both the first signal and the second signal are low level, the processing module determines that the high voltage loop is in a short-to-ground state. 2. The circuit of claim 1, further comprising a power module, wherein: The power module is coupled to the first input end of the first comparator; The power module is used to supply power to the circuit where the control module is located. 3. The circuit of claim 2, wherein the power module includes a first power supply and a first resistor, wherein: The first power supply is coupled to the first input terminal of the first comparator through the first resistor. 4. The circuit according to any one of claims 1 to 3, characterized in that the reference power module is used to provide a reference voltage for the first comparator and the second comparator. 5. The circuit according to any one of claims 1-4, wherein the reference power module includes a second power supply, wherein: The second power supply is coupled to the second input terminal of the first comparator and the second input terminal of the second comparator respectively. 6. The circuit of claim 5, wherein the power module further includes a second resistor and a third resistor, wherein: One end of the second resistor is coupled to the second power supply, one end of the third resistor is coupled to the ground terminal, and the other end of the second resistor is coupled to the other end of the third resistor and the first comparator respectively. the second input terminal and the second input terminal of the second comparator. 7. The circuit according to any one of claims 1-6, characterized in that the control module includes a switching device, wherein: The first terminal of the switching device is coupled to the first input terminal of the second comparator, the second terminal of the switching device is coupled to the ground terminal, and the third terminal of the switching device is coupled to the processing module. 8. The circuit of claim 7, wherein the control module further includes a fourth resistor, wherein: Two ends of the fourth resistor are respectively coupled to the first end of the switching device and the first input end of the first comparator. 9. An electronic device, characterized in that it includes at least a high-voltage circuit and a high-voltage interlock detection circuit as claimed in any one of claims 1 to 8, wherein: The high-voltage circuit is coupled to the high-voltage interlock detection circuit.