CN110967616A

CN110967616A - High-voltage interlocking system and detection method thereof

Info

Publication number: CN110967616A
Application number: CN201910137498.9A
Authority: CN
Inventors: 代伟; 傅焱辉; 刘宇; 李前邓
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-02-25
Filing date: 2019-02-25
Publication date: 2020-04-07
Anticipated expiration: 2039-02-25
Also published as: CN110967616B

Abstract

The invention provides a high-voltage interlocking system and a detection method thereof, and relates to the technical field of electric power. In the high-voltage interlocking system, if it is determined that neither the first constant power supply nor the second constant power supply has a fault, the control module inputs a first driving signal to the source signal generating module and controls to output an alternating current signal, and if it is determined that one of the first constant power supply and the second constant power supply has a fault, the control module inputs a second driving signal to the source signal generating module and controls to output a direct current signal, receives a detection result signal and determines the fault of the high-voltage interlocking module according to the detection result signal; the source signal generation module controls the first constant power supply and the second constant power supply to be in a working state alternately according to the first driving signal, and controls one power supply which does not have a fault to be in the working state continuously according to the second driving signal; and the signal detection module outputs a detection result signal according to the electric signal of the detection resistor set. By utilizing the technical scheme of the invention, the reliability of the high-voltage interlocking system can be improved.

Description

High-voltage interlocking system and detection method thereof

Technical Field

The invention belongs to the technical field of electric power, and particularly relates to a high-voltage interlocking system and a detection method thereof.

Background

With the rapid development of new energy vehicles, the safety problem of new energy vehicles becomes a key problem for people to pay attention to. The new energy automobile provides power for the automobile by high voltage and large current, so that a high-voltage interlocking system in high-voltage safety is of great importance in a high-voltage loop monitoring system.

The high-voltage interlocking system is used for monitoring the connection integrity among all high-voltage components in the new energy automobile and ensuring that the new energy automobile can run in a safe state. The high-voltage interlocking system is provided with a signal source for generating signals, and the signals for detecting the faults of the high-voltage interlocking system are provided by the signal source. If the signal source is disturbed or damaged, the situation that the high-voltage interlocking system has a false alarm fault or the high-voltage interlocking system cannot judge the fault may occur, so that the reliability of the high-voltage interlocking system is reduced.

Disclosure of Invention

The embodiment of the invention provides a high-voltage interlocking system and a detection method thereof, which can improve the reliability of the high-voltage interlocking system.

In a first aspect, an embodiment of the present invention provides a high-voltage interlock system, including a source signal generating module, a detection resistor set, a signal detection module, and a control module, where the source signal generating module includes a first constant power supply and a second constant power supply; the control module is connected with the source signal generation module and the signal detection module, and is used for inputting a first driving signal to the source signal generation module and controlling the source signal generation module to output an alternating current signal if the first constant power supply and the second constant power supply are determined not to have faults, and is also used for inputting a second driving signal to the source signal generation module and controlling the source signal generation module to output a direct current signal if one of the first constant power supply and the second constant power supply is determined to have faults, receiving a detection result signal sent by the signal detection module, and determining the faults of the high-voltage interlocking module according to the detection result signal; the source signal generating module is connected with the detection resistor set, and is used for controlling the first constant power supply and the second constant power supply to be alternately in a working state according to the first driving signal so as to output an alternating current signal, and is also used for controlling one of the first constant power supply and the second constant power supply which is not in fault to be continuously in the working state according to the second driving signal so as to output a direct current signal; the detection resistor set is connected with the high-voltage interlocking module, the signal detection module is connected with the detection resistor set, and the signal detection module is used for collecting electric signals of the detection resistor set and outputting detection result signals according to the electric signals of the detection resistor set.

In a second aspect, an embodiment of the present invention provides a method for detecting a high-voltage interlock system, which is applied to the high-voltage interlock system in the technical solution of the first aspect, and the method for detecting a high-voltage interlock system includes: the control module determines that neither the first constant power supply nor the second constant power supply fails, inputs a first driving signal to the source signal generation module, and controls the source signal generation module to output an alternating current signal; the source signal generation module is used for controlling the first constant power supply and the second constant power supply to be in a working state alternately according to the first driving signal so as to output an alternating current signal; the control module determines that one of the first constant power supply and the second constant power supply has a fault, inputs a second driving signal to the source signal generation module and controls the source signal generation module to output a direct current signal; the source signal generation module controls one of the first constant power supply and the second constant power supply which is not in fault to be in a working state continuously according to the second driving signal so as to output a direct current signal; the signal detection module collects the electric signals of the detection resistor set and outputs detection result signals according to the electric signals at two ends of the detection resistor set; and the control module receives the detection result signal and determines the fault of the high-voltage interlocking module according to the detection result signal.

The embodiment of the invention provides a high-voltage interlocking system and a detection method thereof.A control module can output different driving signals according to whether a first constant power supply and a second constant power supply have faults or not. The source signal generating module can generate alternating current signals or direct current signals according to different driving signals. Under the condition that the first constant power supply and the second constant power supply do not have faults, alternating current signals can be output. Under the condition that one of the first constant power supply and the second constant power supply has a fault, a continuous direct current signal can be output, the normal operation of the high-voltage interlocking system is ensured, and the fault detection of the high-voltage interlocking module can still be carried out, so that the reliability of the high-voltage interlocking system is improved.

Drawings

The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.

FIG. 1 is a schematic diagram of a high-voltage interlock system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a source signal generating module according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another source signal generating module according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a portion of a high pressure interlock system according to another embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a third signal detection module according to an embodiment of the present invention;

fig. 6 is a waveform diagram of a third detection result signal and a fourth detection result signal of a normal operation of a high-voltage interlock module according to an embodiment of the present invention;

fig. 7 is a waveform diagram of a third detection result signal and a fourth detection result signal of a short power failure of a high-voltage interlock module according to an embodiment of the present invention;

FIG. 8 is a waveform diagram of a third detection result signal and a fourth detection result signal of a high voltage interlock module with a short-circuit fault according to an embodiment of the present invention;

fig. 9 is a waveform diagram of a third detection result signal and a fourth detection result signal of an open-circuit fault occurring in a high-voltage interlock module according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of the results of another high-pressure interlock system in accordance with an embodiment of the present invention;

FIG. 11 is a flow chart of a method for testing a high voltage interlock system according to an embodiment of the present invention;

FIG. 12 is a flowchart of one embodiment of a method for testing a high-voltage interlock system according to an embodiment of the present invention;

FIG. 13 is a flow chart of another specific implementation of a method for detecting a high-voltage interlock system in an embodiment of the invention;

FIG. 14 is a flow chart of a method for testing a high voltage interlock system in accordance with another embodiment of the present invention;

FIG. 15 is a flow chart of a method for testing a high voltage interlock system in accordance with another embodiment of the present invention;

FIG. 16 is a flow chart of a method for testing a high voltage interlock system according to another embodiment of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.

The embodiment of the invention provides a high-voltage interlocking system and a detection method thereof, which can be applied to a scene of high-voltage interlocking safety protection in a new energy automobile. The high-voltage interlocking system provided by the embodiment of the invention has double constant power supplies, and can generate alternating current signals and direct current signals. In case of failure of one of the constant power supplies, the high voltage interlock system can still operate, thereby improving the reliability of the high voltage interlock system.

Fig. 1 is a schematic structural diagram of a high-voltage interlock system according to an embodiment of the present invention. As shown in FIG. 1, the high-voltage interlock system comprises a source signal generation module P1, a detection resistor set P2, a signal detection module P3 and a control module P4. The source signal generating module P1 includes a first constant power supply and a second constant power supply (the first and second constant power supplies are not shown in fig. 1).

The control module P4 is connected to the source signal generating module P1 and the signal detecting module P3. The control module P4 may be configured to input the first driving signal to the source signal generating module P1 and control the source signal generating module P1 to output an ac signal if it is determined that neither the first constant power supply nor the second constant power supply has failed. The control module P4 may be further configured to input a second driving signal to the source signal generating module P1 and control the source signal generating module P1 to output a dc signal if it is determined that one of the first constant power supply and the second constant power supply fails. The control module P4 is further configured to receive the detection result signal from the signal detection module P3, and determine a fault of the high voltage interlock module P5 according to the detection result signal. In some examples, control module P4 may be embodied as a Micro Controller Unit (MCU).

The source signal generation module P1 is connected to the detection resistor set P2. The source signal generating module P1 is configured to control the first constant power source and the second constant power source to be alternately in an operating state according to the first driving signal, so as to output an ac electrical signal. The first constant power supply generates an electric signal in a state where it is in an operating state. The second constant power supply generates an electric signal in a state where it is in an operating state. The first constant power source and the second constant power source may be constant current sources or constant voltage sources, and are not limited herein. Specifically, the direction of the electrical signal generated by the first constant power supply is different from the direction of the electrical signal generated by the second constant power supply. Therefore, the source signal generating module P1 controls the first constant power source and the second constant power source to alternately generate the electrical signal according to the first driving signal, so that the electrical signal in the high-voltage interlock system is an alternating current electrical signal.

The source signal generating module P1 is further configured to control one of the first constant power supply and the second constant power supply, which is not faulty, to be continuously in an operating state according to the second driving signal, so as to output a dc signal. Under the condition that the first constant power supply is independently and continuously in a working state, a direct current signal is generated; under the condition that the second constant power supply is solely and continuously in the working state, the direct current signal is generated. And controlling one of the first constant power supply and the second constant power supply which is not in fault to be in a working state continuously, wherein the electric signal in the high-voltage interlocking system is a continuous direct-current electric signal. In the event of a failure of one of the first and second constant power supplies, the high voltage interlock system may still be operational and a failure of the high voltage interlock module P5 may be detected.

The detection resistor set P2 is connected with the high-voltage interlocking module P5. The sense resistor set P2 includes at least one sense resistor. The number and connection manner of the detection resistors in the detection resistor set P2 are not limited herein. In some examples, the set of sense resistors P2 may also be disposed in the high voltage interlock module P5, i.e., the set of sense resistors P2 is located in the high voltage interlock loop. The high voltage interlock module P5 may include high voltage components such as high voltage connectors, Manual Service Disconnect (MSD), and the like. The high-voltage interlock module P5 may be, but is not limited to, a high-voltage interlock circuit.

The signal detection module P3 is connected to the detection resistor set P2. The signal detection module P3 is configured to collect electrical signals of the detection resistor set P2, and output a detection result signal according to the electrical signals of the detection resistor set P2. The connection method of the signal detection module P3 and the detection resistor set P2 is not limited to the method shown in fig. 1. The electrical signals collected by the signal detection module P3 and used for detecting the resistor set P2 may be ac signals or dc signals, and are not limited herein. The detection resistance set P2 can compare the collected electric signals of the detection resistance set P2 with other signals or signal thresholds, thereby outputting detection result signals. The detection result signal can be used for representing the fault of the high-voltage interlocking loop. The control module P4 may determine a fault in the high-voltage interlock circuit based on the detection result signal. In some examples, the faults of the high voltage interlock loop may include short power faults, short ground faults, and open faults.

In the embodiment of the present invention, the control module P4 may output different driving signals according to whether the first constant power supply and the second constant power supply fail. The source signal generating module P1 may generate ac signals or dc signals according to different driving signals. Under the condition that the first constant power supply and the second constant power supply do not have faults, alternating current signals can be output. Under the condition that one of the first constant power supply and the second constant power supply has a fault, a continuous direct current signal can be output, the normal operation of the high-voltage interlocking system is ensured, the fault detection of the high-voltage interlocking module P5 can still be carried out, and therefore the reliability of the high-voltage interlocking system is improved.

Fig. 2 is a schematic structural diagram of a source signal generating module according to an embodiment of the present invention. As shown in fig. 2, the source signal generating module P1 further includes a first power supply P13, a second power supply P14, a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4.

The first power supply source P13 is connected to one end of a first switch K1, the other end of the first switch K1 is connected to one end of a second switch K2, and the other end of the second switch K2 is connected to a reference voltage terminal.

An input terminal of the first constant power supply P11 is connected to the other terminal of the first switch K1, one terminal of the second switch K2, and one terminal of the detection resistor set P2, and an output terminal of the first constant power supply P11 is connected to one terminal of the detection resistor set P2.

The second power supply P14 is connected to one end of a third switch K3, the other end of the third switch K3 is connected to one end of a fourth switch K4, and the other end of the fourth switch K4 is connected to the reference voltage terminal.

An input end of the second constant power supply P12 is connected with the other end of the third switch K3, one end of the fourth switch K4 and the other end of the detection resistor set P2, and an output end of the second constant power supply P12 is connected with the other end of the detection resistor set P2.

The first power supply P13 supplies an electric signal to the first constant power supply P11, and the second power supply P14 supplies an electric signal to the second constant power supply P12. The types of the first power supply source P13 and the second power supply source P14 are not limited, and may be constant power supplies or non-constant power supplies. The first power supply P13 and the second power supply P14 output constant electric signals after electric signals provided by the first constant power supply P11 and the second constant power supply P12 are converted by the first constant power supply P11 and the second constant power supply P12. That is, the first constant power supply P11 and the second constant power supply P12 output constant electric signals. For example, if the first and second constant power sources P11 and P12 are constant current sources, the first and second constant power sources P11 and P12 output constant current electrical signals. For another example, if the first constant power supply P11 and the second constant power supply P12 are constant voltage sources, the first constant power supply P11 and the second constant power supply P12 output constant voltage electrical signals.

The first driving signal in the above embodiment is used to control the first switch K1 combination and the second switch K2 combination to be turned on alternately. The second driving signal is used for controlling the first switch K1 combination or the second switch K2 combination to be continuously conducted. The first switch K1 combination comprises a first switch K1 and a fourth switch K4, and the second switch K2 combination comprises a second switch K2 and a third switch K3.

In some examples, the source signal generation module P1 may further include one or more of a first anti-reflection unit P15, a second anti-reflection unit P16, a third anti-reflection unit P17, and a fourth anti-reflection unit P18. Fig. 2 illustrates an example in which the source signal generation module P1 includes a first anti-inversion unit P15, a second anti-inversion unit P16, a third anti-inversion unit P17, and a fourth anti-inversion unit P18, and the detection resistance set P2 includes detection resistances Rt1 and Rt 2.

The first anti-reverse unit P15 is located between the output terminal of the first constant power supply P11 and one end of the set of detection resistors P2. That is, the output terminal of the first constant power supply P11 is connected to one terminal of the sensing resistor set P2 through the first anti-reverse unit P15. The second anti-reverse unit P16 is located between the input terminal of the first constant power supply P11 and one end of the set of sense resistors P2. That is, the input terminal of the first constant power supply P11 is connected to one terminal of the sensing resistor set P2 through the second anti-reverse unit P16. The third inversion prevention unit P17 is located between the output terminal of the second constant power supply P12 and the other end of the detection resistance set P2. That is, the output terminal of the second constant power supply P12 is connected to the other terminal of the sensing resistor set P2 through the third anti-reverse unit P17. The fourth anti-inversion unit P18 is located between the input terminal of the second constant power supply P12 and the other end of the set of sense resistors P2. That is, the input terminal of the second constant power supply P12 is connected to the other terminal of the sensing resistor set P2 through the fourth anti-reverse unit P18.

The first anti-reflection unit P15, the second anti-reflection unit P16, the third anti-reflection unit P17 and the fourth anti-reflection unit P18 are used for preventing the reverse flow of the electric signal.

As shown in fig. 2, the first switch K1 and the fourth switch K4 are turned on, and the second switch K2 and the third switch K3 are turned off. The flowing direction of the electric signal is the first power supply P13 → the first constant power supply P11 → the first anti-reflection unit P15 → the detection resistor Rt1 → the high voltage interlock module P5 → the detection resistor Rt2 → the fourth anti-reflection unit P18 → the fourth switch K4 → the reference voltage terminal.

The second switch K2 and the third switch K3 are turned on, and the first switch K1 and the fourth switch K4 are turned off. The flowing direction of the electric signal is the second power supply P14 → the second constant power supply P12 → the third anti-reflection unit P17 → the detection resistor Rt2 → the high voltage interlock module P5 → the detection resistor Rt1 → the second anti-reflection unit P16 → the second switch K2 → the reference voltage terminal.

The first switch K1 combination and the second switch K2 combination are conducted alternately, so that the flow direction of the electric signal in the high-voltage interlocking system is changed periodically, and an alternating current electric signal is generated.

If the first switch K1 combination is continuously turned on and the second switch K2 combination is continuously turned off, the direction of the flow of the electrical signal in the high-voltage interlock system is unchanged, and thus a direct current electrical signal is generated. Similarly, if the second switch K2 combination is turned on continuously, the first switch K1 combination is turned off continuously, and a dc signal is generated.

The first anti-reverse unit P15 in the above embodiment can prevent the electric signal in the high voltage interlock system from flowing from the output terminal to the input terminal of the first constant power supply P11. The fourth anti-theft unit P18 may prevent the electrical signal provided by the second power supply P14 from flowing into the high voltage interlock module P5 without passing through the second constant power supply P12. The second anti-reverse unit P16 may prevent the electrical signal provided by the first power supply P13 from flowing into the high voltage interlock module P5 without passing through the first constant power supply P11. The third preventing unit P17 prevents an electric signal in the high voltage interlock system from flowing from the output terminal to the input terminal of the second constant power supply P12. The first anti-reflection unit P15, the second anti-reflection unit P16, the third anti-reflection unit P17 and the fourth anti-reflection unit P18 can effectively prevent the phenomenon that the electric signals in the high-voltage interlocking system flow back.

In some examples, the first anti-reflection unit P15, the second anti-reflection unit P16, the third anti-reflection unit P17 and the fourth anti-reflection unit P18 may be implemented by being kept turned on in a direction in which an electric signal flows and being kept turned off in a direction in which the electric signal does not flow by a diode or a switch.

Fig. 3 is a schematic structural diagram of another source signal generating module according to an embodiment of the present invention. Fig. 3 is different from fig. 2 in that the detection resistor set P2 shown in fig. 3 includes a detection resistor Rt1, and the detection resistor Rt1 is located in the high voltage interlock module P5. It is not limited herein whether the detection resistors in the detection resistor set P2 are located within the high voltage interlock module P5.

Fig. 4 is a schematic structural diagram of a portion of a high-pressure interlock system according to another embodiment of the present invention. The source signal generating module P1 in fig. 4 is the same as the source signal generating module P1 shown in fig. 2. On this basis, the signal detection module P3 may include a first signal detection module P31 and a second signal detection module P32. The high voltage interlock system may also include a first source detection module P6 and a second source detection module P7.

The first signal detection module P31 is connected to one end of the high voltage interlock module P5 and the control module P4. The first signal detecting module P31 is used for collecting an electrical signal at one end of the high voltage interlock module P5 and outputting a first detection result signal according to the electrical signal at one end of the high voltage interlock module P5. As shown in fig. 4, the first signal detecting module P31 is connected to the other end of the detecting resistor Rt 1. In other embodiments, the first signal detecting module P31 may also be connected to one end of the detecting resistor Rt1, which is not limited herein.

In some examples, the first signal detection module P31 includes a first network of resistors R1 and a first network of capacitors C1. The first resistor R1 network may include a plurality of resistors, and the number and connection of the resistors in the first resistor R1 network is not limited herein. The first capacitor C1 network may include at least one capacitor, and if the first capacitor C1 network includes a plurality of capacitors, the number and connection of the capacitors are not limited herein. For example, as shown in fig. 4, the first resistor R1 network includes a first resistor R1, a second resistor R2 and a third resistor R3, and the first capacitor C1 network includes a first capacitor C1. One end of the first resistor R1 is connected with one end of the high-voltage interlocking loop, and the other end of the first resistor R1 is connected with one end of the second resistor R2 and one end of the third resistor R3. The other end of the second resistor R2 is connected to one end of the first capacitor C1. The other end of the third resistor R3 is connected to the reference voltage terminal. The other terminal of the first capacitor C1 is connected to the reference voltage terminal.

It should be noted that, in the case that the source signal generating module P1 outputs a dc signal, the monitoring and the detection of the high voltage interlock module P5 can be realized through the first resistor R1 network and the first capacitor C1 network.

The second signal detection module P32 is connected to the other end of the high voltage interlock module P5 and the control module P4. The second signal detection module P32 is used for collecting the electrical signal of the other end of the high voltage interlock module P5 and outputting a second detection result signal according to the electrical signal of the other end of the high voltage interlock module P5. As shown in fig. 4, the second signal detecting module P32 is connected to one end of the detecting resistor Rt 2. In other embodiments, the second signal detecting module P32 may also be connected to the other end of the detecting resistor Rt2, which is not limited herein.

In some examples, the second signal detection module P32 includes a second network of resistors R2 and a second network of capacitors C2. The second resistor R2 network may include a plurality of resistors, and the number and connection of the resistors in the second resistor R2 network is not limited herein. The second capacitor C2 network may include at least one capacitor, and if the second capacitor C2 network includes a plurality of capacitors, the number and connection of the capacitors are not limited herein. For example, as shown in fig. 4, the second resistor R2 network includes a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, and the second capacitor C2 network includes a second capacitor C2. One end of the fourth resistor R4 is connected with the other end of the high-voltage interlocking module P5, and the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5 and one end of the sixth resistor R6. The other end of the fifth resistor R5 is connected to one end of the second capacitor C2. The other end of the sixth resistor R6 is connected to the reference voltage terminal. The other terminal of the second capacitor C2 is connected to the reference voltage terminal.

In some examples, the high voltage interlock system further includes a first source detection module P6 and a second source detection module P7.

The first source detection module P6 is connected to the first constant power supply P11 and the control module P4. The first source detecting module P6 is used for collecting the first source detecting signal and sending it to the control module P4.

In some examples, the first source detection module P6 includes a third network of resistors R3 and a third network of capacitors C3. The network of the third resistor R3 may include a plurality of resistors, and the number and connection of the resistors in the network of the third resistor R3 are not limited herein. The third capacitor C3 network may include at least one capacitor, and if the third capacitor C3 network includes a plurality of capacitors, the number and connection of the capacitors are not limited herein. For example, as shown in fig. 4, the third resistor R3 network includes a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and the third capacitor C3 network includes a third capacitor C3. One end of the seventh resistor R7 is connected to the output terminal of the first constant power source P11, and the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9. The other end of the eighth resistor R8 is connected to one end of the third capacitor C3. The other end of the ninth resistor R9 is connected to the reference voltage terminal. The other terminal of the third capacitor C3 is connected to the reference voltage terminal. The first source detection signal may be an electrical signal collected from the other end of the eighth resistor R8.

The second source detection module P7 is connected to the second constant power supply P12 and the control module P4. The second source detecting module P7 is used for collecting the second source detecting signal and sending it to the control module P4.

In some examples, the second source detection module P7 includes a fourth network of resistors R4 and a fourth network of capacitors C4. The fourth resistor R4 network may include a plurality of resistors, and the number and connection of the resistors in the fourth resistor R4 network is not limited herein. The fourth capacitor C4 network may include at least one capacitor, and if the fourth capacitor C4 network includes a plurality of capacitors, the number and connection of the capacitors are not limited herein. For example, as shown in fig. 4, the second resistor R2 network includes a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12, and the fourth capacitor C4 network includes a fourth capacitor C4. One end of a tenth resistor R10 is connected to the output terminal of the second constant power source P12, and the other end of the tenth resistor R10 is connected to one end of an eleventh resistor R11 and one end of a twelfth resistor R12. The other end of the eleventh resistor R11 is connected to one end of the fourth capacitor C4. The other end of the twelfth resistor R12 is connected to the reference voltage terminal. The other terminal of the fourth capacitor C4 is connected to the reference voltage terminal. Wherein, the second source detection signal may be an electrical signal collected from the other end of the eleventh resistor R11.

Correspondingly, the control module P4 in the above embodiment is further configured to determine whether the first constant power supply P11 is faulty according to the first source detection signal. The control module P4 is further configured to determine whether the second constant power supply P12 is malfunctioning based on the second source detection signal.

In some examples, the signal detection module P3 includes a third signal detection module. The third signal detection module is connected in parallel with the detection resistors in the detection resistor set P2. The third signal detection module is used for collecting electric signals at two ends of the detection resistor and outputting a detection result signal according to the electric signals at two ends of the detection resistor.

Fig. 5 is a schematic structural diagram of a third signal detection module according to an embodiment of the present invention. As shown in fig. 5, the third signal detection block P33 includes a differential operational amplification unit P331 and a limit value comparison unit P332.

The input end of the difference operational amplification unit P331 is connected to the two ends of the detection resistor, and the output end of the difference operational amplification unit P331 is connected to the limit value comparison unit P332. The differential operational amplification unit P331 is configured to amplify the electrical signals at the two ends of the detection resistor into electrical signals to be detected, and input the electrical signals to be detected into the limit value comparison unit P332.

The limit value comparison unit P332 is connected to the control module P4. The limit value comparing unit P332 is configured to generate an upper limit signal threshold value and a lower limit signal threshold value, compare the electrical signal to be detected with the upper limit signal threshold value and the lower limit signal threshold value, and output a detection result signal.

It should be noted that the third signal detecting module P33 may output a detection result signal when the electrical signal in the high-voltage interlock system is an ac electrical signal, so that the control module P4 may determine the fault of the high-voltage interlock module P5 according to the detection result signal.

In some examples, the differential operational amplification unit P331 may include a differential operational amplifier, a resistor, a capacitor, and the like, which is not limited herein. The limit comparing unit P332 may include a comparator, a resistor, a capacitor, and the like, and is not limited herein.

A specific example will be described below. For example, the direction of the alternating current signal in the normal operation of the high-voltage interlocking system is set as the to-be-detected electric signal V of the first direction_out1Above the upper signal threshold V_{lim_H}I.e. V_out1＞V_{lim_H}The direction of the alternating current signal in the normal work of the high-voltage interlocking system is the second direction of the electric signal V to be detected_out2Below a lower signal threshold V_{lim_L}I.e. V_out2＜V_{lim_L}. The first direction is opposite to the second direction. And when the alternating current signal is 0, the direction of the to-be-detected electric signal higher than the alternating current voltage signal under the normal work of the high-voltage interlocking system is the to-be-detected voltage signal in the second direction. If the AC signal is 0, the detected signal is V_out3And V is_{lim_H}＞V_out3＞V_{lim_L}. Then, in the high-voltage interlock system, there are four cases where the high-voltage interlock module P5 is normally operated, the high-voltage interlock module P5 has an open fault, the high-voltage interlock module P5 has a short fault, and the high-voltage interlock module P5 has a short power failure. In the present embodiment, the detection result signal output by the limit value comparing unit P332 may include a third detection result signal and a fourth detection result signal. The third detection result signal and the fourth detection result signal are different in the four cases.

Fig. 6 is a waveform diagram of a third detection result signal and a fourth detection result signal of a normal operation of a high-voltage interlock module according to an embodiment of the present invention. As shown in fig. 6, since an alternating current signal flows through the detection resistor, the electric signal to be detected also changes periodically. When the direction of the ac signal is the first direction, the current flowing through the detection resistor is n milliamperes. When the direction of the alternating current signal is the second direction, the current flowing through the detection resistor is-n milliamperes. The state in which the electric signal to be detected is higher than the upper limit signal threshold and the state in which the electric signal to be detected is lower than the lower limit signal threshold alternately appear, so that waveforms of the third detection result signal and the fourth detection result signal shown in fig. 6 are obtained.

Fig. 7 is a waveform diagram of a third detection result signal and a fourth detection result signal of a high-voltage interlock module with a short power failure according to an embodiment of the present invention. As shown in fig. 7, when the direction of the ac signal is the first direction due to the short power failure of the high voltage interlock module P5, the current flowing through the detection resistor is 0. When the direction of the alternating current signal is in the second direction, the current flowing through the detection resistor is still-n milliamperes in a normal state. Thereby obtaining the waveforms of the third detection result signal and the fourth detection result signal as shown in fig. 7.

Fig. 8 is a waveform diagram of a third detection result signal and a fourth detection result signal of a high voltage interlock module with a short-circuit fault according to an embodiment of the present invention. As shown in fig. 8, when the direction of the ac signal is the second direction due to the short-circuit fault of the high-voltage interlock module P5, the current flowing through the detection resistor is 0. When the direction of the ac signal is the first direction, the current flowing through the detection resistor is still n milliamperes in the normal state. Thereby obtaining the waveforms of the third detection result signal and the fourth detection result signal as shown in fig. 8.

Fig. 9 is a waveform diagram of a third detection result signal and a fourth detection result signal of an open-circuit fault occurring in a high-voltage interlock module according to an embodiment of the present invention. As shown in fig. 9, when the direction of the ac signal is the first direction due to the open circuit fault of the high voltage interlock module P5, the current flowing through the detection resistor is 0. When the direction of the ac signal is the second direction, the current flowing through the detection resistor is also 0. Thereby obtaining the waveforms of the third detection result signal and the fourth detection result signal as shown in fig. 9.

In fig. 6 to 9, a broken line is a reference line of a low-level signal, a low-level signal is superimposed on the broken line, and a high-level signal is superimposed on the broken line.

In some examples, the signal detection module P3 may include the first signal detection module P31, the second signal detection module P32, and the third signal detection module P33 at the same time. For example, fig. 10 is a diagram illustrating the results of another high-voltage interlock system in accordance with an embodiment of the present invention. As shown in fig. 10, the signal detection module P3 in the high voltage interlock system includes a first signal detection module P31, a second signal detection module P32, and a third signal detection module P33. The contents of the first signal detecting module P31, the second signal detecting module P32 and the third signal detecting module P33 can be found in the related descriptions of the above embodiments. The first signal detection module P31, the second signal detection module P32, and the third signal detection module P33 can all perform fault detection on the high-voltage interlocking module P5, so that whether the determined fault of the high-voltage interlocking module P5 is effective or not is verified mutually, and the accuracy and reliability of determining the fault of the high-voltage interlocking module P5 in the high-voltage interlocking system are further improved.

In the above figures, the reference voltage terminal is specifically shown as ground for convenience of illustration. However, the reference voltage terminal in the above embodiments is not limited to ground, and may also be other voltage terminals, and is not limited herein.

The embodiment of the invention also provides a detection method of the high-voltage interlocking system, which can be applied to the high-voltage interlocking system in the embodiment. Fig. 11 is a flowchart of a detection method of a high-voltage interlock system according to an embodiment of the present invention. As shown in fig. 11, the detection method of the high-voltage interlock system may include steps S101 to S106.

In step S101, the control module determines that neither the first constant power supply nor the second constant power supply has failed, inputs the first driving signal to the source signal generation module, and controls the source signal generation module to output the ac signal.

In some examples, the first driving signal may be a Pulse signal, for example, the first driving signal may be a Pulse Width Modulation (PWM) signal.

In step S102, the source signal generating module is configured to control the first constant power supply and the second constant power supply to be alternately in an operating state according to the first driving signal, so as to output an ac electrical signal.

In step S103, the control module determines that one of the first constant power source and the second constant power source has a fault, inputs the second driving signal to the source signal generating module, and controls the source signal generating module to output the dc signal.

In some examples, the second drive signal may be a constant signal, such as a continuous high level signal.

In step S104, the source signal generating module controls one of the first constant power supply and the second constant power supply, which is not faulty, to be continuously in an operating state according to the second driving signal to output a dc signal.

For example, if it is determined that the first constant power supply fails, the control module sends a second driving signal to the source signal generation module, so that the second constant power supply is continuously in a working state, and outputs a direct current signal. For another example, if it is determined that the second constant power supply fails, the control module sends a second driving signal to the source signal generating module, so that the first constant power supply is continuously in the working state, and the first constant power supply outputs a direct current signal.

In step S105, the signal detection module collects the electrical signals of the detection resistor set, and outputs a detection result signal according to the electrical signals at two ends of the detection resistor set.

In step S106, the control module receives the detection result signal and determines a fault of the high-voltage interlock module according to the detection result signal.

The relevant contents of the steps S101 to S106 can refer to the relevant descriptions in the above embodiments, and are not described herein again.

In the embodiment of the invention, the control module can output different driving signals according to whether the first constant power supply and the second constant power supply have faults or not. The source signal generating module can generate alternating current signals or direct current signals according to different driving signals. Under the condition that the first constant power supply and the second constant power supply do not have faults, alternating current signals can be output. Under the condition that one of the first constant power supply and the second constant power supply has a fault, a continuous direct current signal can be output, the normal operation of the high-voltage interlocking system is ensured, and the fault detection of the high-voltage interlocking module can still be carried out, so that the reliability of the high-voltage interlocking system is improved.

In some examples, the structure of the high-voltage interlock system is as shown in fig. 2 or fig. 3, and the first driving signal in the above embodiments is used to control the first switch combination and the second switch combination to be alternately conducted. The second driving signal is used for controlling the first switch combination or the second switch combination to be continuously conducted. The first switch combination comprises a first switch and a fourth switch, and the second switch combination comprises a second switch and a third switch.

In some examples, fig. 12 is a flowchart of a specific implementation manner of a detection method of a high-voltage interlock system according to an embodiment of the present invention. If the control module outputs the second driving signal, and the second driving signal is a signal with a duty ratio of 0 or a signal with a duty ratio of 100%, that is, the second driving signal may be a continuous high level signal or a continuous low level signal, and the signal detection module includes the first signal detection module and the second signal detection module, the step S106 may be further subdivided into steps S1061 to S1064.

In step S1061, if the signal detection module determines that the first detection result signal and the second detection result signal are both located in the first signal interval, it is determined that the high-voltage interlock module has not failed.

The first signal interval is a signal interval defined by a first signal threshold and a second signal threshold. The second signal threshold is greater than the first signal threshold. The second signal threshold is the upper limit value of the signal interval in which the high-voltage interlocking module normally works, and the first signal threshold is the lower limit value of the signal interval in which the high-voltage interlocking module normally works.

The first signal threshold and the second signal threshold may be obtained based on Worst Case Circuit Analysis (WCCA) according to a resistance distribution of resistors in the high voltage interlock module or a resistance distribution of resistors in the high voltage interlock loop, and are not limited herein. For example, the first signal threshold is greater than or equal to 1.5 volts and less than or equal to 2 volts. The second signal threshold is greater than or equal to 2.4 volts and less than 2.8 volts. It should be further noted that the value ranges of the first signal threshold and the second signal threshold may vary with the resistance of the resistor in the high-voltage interlock module or the resistance of the resistor in the high-voltage interlock loop.

In step S1062, if the signal detection module determines that the first detection result signal is greater than the third signal threshold and the second detection result signal is less than the fourth signal threshold, it is determined that the high-voltage interlock module has an open-circuit fault.

Wherein the third signal threshold is greater than the second signal threshold and the fourth signal threshold is less than the first signal threshold. The third signal threshold and the fourth signal threshold may be obtained according to the resistance distribution of the resistors in the high-voltage interlock module or the resistance distribution of the resistors in the high-voltage interlock loop, and based on the worst-case circuit analysis, which is not limited herein. For example, the third signal threshold is equal to or greater than 3 volts and equal to or less than 3.5 volts. The fourth signal threshold is 0 or more and 0.5 volts or less. It should be further noted that the value ranges of the third signal threshold and the fourth signal threshold may vary with the resistance of the resistor in the high-voltage interlock module or the resistance of the resistor in the high-voltage interlock loop.

In step S1063, if the signal detection module determines that the first detection result signal and the second detection result signal are both greater than the third signal threshold, it is determined that the high-voltage interlock module has a short power failure.

In step S1064, if the signal detection module determines that the first detection result signal and the second detection result signal are both smaller than the fourth signal threshold, it is determined that the high-voltage interlock module has a short-circuit fault.

In some examples, fig. 13 is a flowchart of another specific implementation manner of a detection method of a high-voltage interlock system according to an embodiment of the present invention, and the detection method of the high-voltage interlock system is particularly applicable to a high-voltage interlock system including the third signal detection module shown in fig. 5. The above step S105 can be subdivided into step S1051 and step S1052.

In step S1051, the differential operational amplifier amplifies the collected electrical signal of the detection resistor into an electrical signal to be detected, and inputs the electrical signal to be detected to the limit value comparator.

In step S1052, the limit comparing unit generates an upper limit signal threshold and a lower limit signal threshold, compares the electrical signal to be detected with the upper limit signal threshold and the lower limit signal threshold, and outputs a detection result signal.

The relevant contents of step S1051 to step S1052 can refer to the relevant descriptions in the above embodiments, and are not repeated herein.

In some examples, fig. 14 is a flowchart of a method for detecting a high-voltage interlock system according to another embodiment of the present invention, which can be applied to the high-voltage interlock system shown in fig. 4. Before the control module inputs the first driving signal and the second driving signal to the signal source generation module, the first constant power supply and the second constant power supply can be detected by the first source detection unit and the second source detection unit. Fig. 14 is different from fig. 11 in that the detection method of the high-voltage interlock system shown in fig. 14 may further include step S107 and step S108.

In step S107, the control module receives the first source detection signal output by the first source detection unit, and determines that the first constant power source has a short-circuit fault if it is determined that the first source detection signal is greater than the first source signal threshold.

In step S108, the control module receives a second source detection signal output by the second source detection unit, and determines that the second constant power supply has a short-circuit fault if it is determined that the second source detection signal is greater than the first source signal threshold.

The first source signal threshold may be set according to a specific work scenario and a work requirement, and is not limited herein. For example, the first source signal threshold is 10 volts or more and 12 volts or less. It should be further noted that the value range of the first source signal threshold may vary with the input of the first constant power supply and the input of the second constant power supply.

In some examples, fig. 15 is a flowchart of a method for detecting a high-voltage interlock system according to another embodiment of the present invention, which can be applied to the high-voltage interlock system shown in fig. 4. The second driving signal is a signal having a duty ratio of 0. Fig. 15 is different from fig. 11 in that the detection method of the high-voltage interlock system shown in fig. 15 may further include step S109 and step S110.

In step S109, the control module receives the first source detection signal output by the first source detection unit, and determines that the first constant power supply has an open-circuit fault if it is determined that the first source detection signal is smaller than the second source signal threshold.

In step S110, if the control module determines that the difference between the signal of the first power supply source and the first source detection signal is smaller than the second source signal threshold, it determines that the first constant power supply has a short-circuit fault.

The second source signal threshold may be set according to a specific work scenario and a work requirement, and is not limited herein. For example, the second source signal threshold may be 1.5 volts. It should be further noted that the value range of the second source signal threshold may vary with the first constant power supply and the second constant power supply.

Step S109 and step S110 may be executed after step S107 and/or step S108, and is not limited herein.

It should be noted that step S109 and step S110 may be executed after a time delay after the second driving signal, which is a signal with a duty ratio of 0, is sent. For example, the duration of the time period of the delay may be t milliseconds, and the value of t is not limited herein. Specifically, the time period of the delay may have a duration of 50 milliseconds.

In some examples, fig. 16 is a flowchart of a method for detecting a high-voltage interlock system according to another embodiment of the present invention, which can be applied to the high-voltage interlock system shown in fig. 4. The second driving signal is a signal with a duty ratio of 100%. Fig. 16 is different from fig. 11 in that the detection method of the high-voltage interlock system shown in fig. 16 may further include step S111 and step S112.

In step S111, the control module receives a second source detection signal output by the second source detection unit, and determines that the second constant power supply has an open-circuit fault if it is determined that the second source detection signal is smaller than a second source signal threshold.

In step S112, if the control module determines that the difference between the signal of the second power supply source and the second source detection signal is smaller than the second source signal threshold, it determines that the second constant power supply has a short-circuit fault.

Step S111 and step S112 may be executed after step S107, step S108, step S109, and/or step S110, and is not limited herein.

It should be noted that step S111 and step S112 may be executed after a time delay after the second driving signal, which is a signal with a duty ratio of 100%, is sent. For example, the duration of the time period of the delay may be t milliseconds, and the value of t is not limited herein. Specifically, the time period of the delay may have a duration of 50 milliseconds.

It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For method embodiments, reference may be made to the description of the system embodiments for relevant points. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.

It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The functions of the various parts appearing in the claims may be implemented by a single hardware or software module. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A high-voltage interlocking system is characterized by comprising a source signal generating module, a detection resistor set, a signal detection module and a control module, wherein the source signal generating module comprises a first constant power supply and a second constant power supply;

the control module is connected with the source signal generating module and the signal detecting module, and is used for inputting a first driving signal to the source signal generating module and controlling the source signal generating module to output an alternating current signal if the first constant power supply and the second constant power supply are determined not to have faults, inputting a second driving signal to the source signal generating module and controlling the source signal generating module to output a direct current signal if one of the first constant power supply and the second constant power supply is determined to have faults, receiving a detection result signal sent by the signal detecting module, and determining the faults of the high-voltage interlocking module according to the detection result signal;

the source signal generating module is connected with the detection resistor set, and is used for controlling the first constant power supply and the second constant power supply to be alternately in a working state according to the first driving signal so as to output an alternating current signal, and also used for controlling one of the first constant power supply and the second constant power supply which is not in fault to be continuously in the working state according to the second driving signal so as to output a direct current signal;

the detection resistor set is connected with the high-voltage interlocking module, the signal detection module is connected with the detection resistor set, and the signal detection module is used for collecting electric signals of the detection resistor set and outputting detection result signals according to the electric signals of the detection resistor set.

2. The high voltage interlock system of claim 1, wherein said source signal generating module further comprises a first power supply, a second power supply, a first switch, a second switch, a third switch, and a fourth switch;

the first power supply source is connected with one end of the first switch, the other end of the first switch is connected with one end of the second switch, and the other end of the second switch is connected with a reference voltage end;

the input end of the first constant power supply is connected with the other end of the first switch, one end of the second switch and one end of the detection resistor set, and the output end of the first constant power supply is connected with one end of the detection resistor set;

the second power supply source is connected with one end of the third switch, the other end of the third switch is connected with one end of the fourth switch, and the other end of the fourth switch is connected with the reference voltage end;

the input end of the second constant power supply is connected with the other end of the third switch, one end of the fourth switch and the other end of the detection resistor set, and the output end of the second constant power supply is connected with the other end of the detection resistor set.

3. The system of claim 2, wherein the first driving signal is configured to control the first switch combination to conduct alternately with the second switch combination;

the second driving signal is used for controlling the first switch combination or the second switch combination to be continuously conducted;

the first switch combination includes the first switch and the fourth switch, and the second switch combination includes the second switch and the third switch.

4. The high voltage interlock system of claim 2, wherein said source signal generating module further comprises one or more of a first anti-lockout unit, a second anti-lockout unit, a third anti-lockout unit, and a fourth anti-lockout unit;

the first anti-reverse unit is positioned between the output end of the first constant power supply and one end of the detection resistor set;

the second anti-reverse unit is positioned between the input end of the first constant power supply and one end of the detection resistor set;

the third anti-reflection unit is positioned between the output end of the second constant power supply and the other end of the detection resistor set;

the fourth anti-reflection unit is located between the input end of the second constant power supply and the other end of the detection resistor set.

5. The high-voltage interlock system according to claim 1, wherein the signal detection module comprises a first signal detection module and a second signal detection module, and the detection result signal comprises a first detection result signal and a second detection result signal;

the first signal detection module is connected with one end of the high-voltage interlocking module and the control module, and is used for acquiring an electric signal at one end of the high-voltage interlocking module and outputting a first detection result signal according to the electric signal at one end of the high-voltage interlocking module;

the second signal detection module is connected with the other end of the high-voltage interlocking module and the control module, and is used for collecting an electric signal at the other end of the high-voltage interlocking module and outputting a second detection result signal according to the electric signal at the other end of the high-voltage interlocking module.

6. The high voltage interlock system of claim 5, wherein said first signal detection module comprises a first resistive network and a first capacitive network, and said second signal detection module comprises a second resistive network and a second capacitive network;

the first end of the first resistor network is connected with one end of the high-voltage interlocking module, the second end of the first resistor network is connected with one end of the first capacitor network, the third end of the first resistor network is connected with a reference voltage end, and the other end of the first capacitor network is connected with the reference voltage end;

the first end of the second resistor network is connected with the other end of the high-voltage interlocking module, the second end of the second resistor network is connected with one end of the second capacitor network, the third end of the second resistor network is connected with the reference voltage end, and the other end of the second capacitor network is connected with the reference voltage end.

7. The high voltage interlock system of claim 1, wherein said signal detection module comprises a third signal detection module;

the third signal detection module is connected in parallel with the detection resistors in the detection resistor set and is used for collecting electric signals at two ends of the detection resistors and outputting detection result signals according to the electric signals at two ends of the detection resistors.

8. The high-voltage interlock system according to claim 7, wherein the third signal detection module comprises a differential operational amplification unit and a limit value comparison unit;

the input end of the differential operational amplification unit is connected with the two ends of the detection resistor, the output end of the differential operational amplification unit is connected with the limit value comparison unit, and the differential operational amplification unit is used for amplifying the electric signals at the two ends of the detection resistor into electric signals to be detected and inputting the electric signals to be detected into the limit value comparison unit;

the limit value comparison unit is connected with the control module and is used for generating an upper limit signal threshold value and a lower limit signal threshold value, comparing the electric signal to be detected with the upper limit signal threshold value and the lower limit signal threshold value and outputting the detection result signal.

9. The high voltage interlock system of claim 1, further comprising a first source detection module and a second source detection module;

the first source detection module is connected with the first constant power supply and the control module, and is used for acquiring a first source detection signal and sending the first source detection signal to the control module;

the second source detection module is connected with the second constant power supply and the control module, and is used for acquiring a second source detection signal and sending the second source detection signal to the control module;

the control module is further configured to determine whether the first constant power supply fails according to the first source detection signal, and determine whether the second constant power supply fails according to the second source detection signal.

10. The high voltage interlock system of claim 9, wherein said first source detection module comprises a third resistive network and a third capacitive network, and said second source detection module comprises a fourth resistive network and a fourth capacitive network;

a first end of the third resistor network is connected with the first constant power supply, a second end of the third resistor network is connected with one end of the third capacitor network, a third end of the third resistor network is connected with a reference voltage end, and the other end of the third capacitor network is connected with the reference voltage end;

the first end of the fourth resistor network is connected with the second constant power supply, the second end of the fourth resistor network is connected with one end of the fourth capacitor network, the third end of the fourth resistor network is connected with the reference voltage end, and the other end of the fourth capacitor network is connected with the reference voltage end.

11. A method for testing a high-voltage interlock system, which is applied to the high-voltage interlock system according to any one of claims 1 to 10, the method comprising:

the control module determines that neither the first constant power supply nor the second constant power supply fails, inputs a first driving signal to the source signal generation module, and controls the source signal generation module to output an alternating current signal;

the source signal generation module is used for controlling the first constant power supply and the second constant power supply to be in a working state alternately according to the first driving signal so as to output an alternating current signal;

the control module determines that one of the first constant power supply and the second constant power supply has a fault, inputs a second driving signal to the source signal generation module, and controls the source signal generation module to output a direct current signal;

the source signal generation module controls one of the first constant power supply and the second constant power supply which does not have a fault to be continuously in a working state according to the second driving signal so as to output a direct current signal;

the signal detection module collects the electric signals of the detection resistor set and outputs the detection result signals according to the electric signals at two ends of the detection resistor set;

and the control module receives the detection result signal and determines the fault of the high-voltage interlocking module according to the detection result signal.

12. The method for detecting a high-voltage interlock system according to claim 11, wherein the source signal generating module further includes a first power supply source, a second power supply source, a first switch, a second switch, a third switch, and a fourth switch, the first power supply source is connected to one end of the first switch, the other end of the first switch is connected to one end of the second switch and the first constant power supply, the other end of the second switch is connected to a reference voltage terminal, the second power supply source is connected to one end of the third switch, the other end of the third switch is connected to one end of the fourth switch and the second constant power supply, and the other end of the fourth switch is connected to the reference voltage terminal;

the first driving signal is used for controlling the first switch combination and the second switch combination to be conducted alternately; the second driving signal is used for controlling the first switch combination or the second switch combination to be continuously conducted; the first switch combination includes the first switch and the fourth switch, and the second switch combination includes the second switch and the third switch.

13. The method for detecting the high-voltage interlocking system according to claim 11, wherein the second driving signal is a signal with a duty ratio of 0 or a signal with a duty ratio of 100%, the signal detection module comprises a first signal detection module and a second signal detection module, the first signal detection module is connected with one end of the high-voltage interlocking module and the control module, the second signal detection module is connected with the other end of the high-voltage interlocking module and the control module, and the detection result signal comprises a first detection result signal and a second detection result signal;

the control module receives the detection result signal and determines the fault of the high-voltage interlocking module according to the detection result signal, and the control module comprises:

if the signal detection module determines that the first detection result signal and the second detection result signal are both located in a first signal interval, determining that the high-voltage interlocking module has no fault, wherein the first signal interval is a signal interval defined by a first signal threshold and a second signal threshold, and the second signal threshold is larger than the first signal threshold;

if the signal detection module determines that the first detection result signal is greater than the third signal threshold and the second detection result signal is less than a fourth signal threshold, determining that the high-voltage interlocking module has an open-circuit fault, wherein the third signal threshold is greater than the second signal threshold and the fourth signal threshold is less than the first signal threshold;

if the signal detection module determines that the first detection result signal and the second detection result signal are both greater than the third signal threshold, determining that the high-voltage interlocking module has a short power failure;

and if the signal detection module determines that the first detection result signal and the second detection result signal are both smaller than the fourth signal threshold, the signal detection module determines that the high-voltage interlocking module has a short-circuit fault.

14. The method for detecting the high-voltage interlocking system according to claim 11, wherein the signal detection module comprises a third signal detection module, the third signal detection module comprises a differential operational amplification unit and a limit comparison unit, an input end of the differential operational amplification unit is connected with two ends of the detection resistor, an output end of the differential operational amplification unit is connected with the limit comparison unit, and the limit comparison unit is connected with the control module;

the signal detection module collects the electric signals of the detection resistor set, and outputs the detection result signals according to the electric signals at two ends of the detection resistor set, and the signal detection module comprises:

the differential operation amplification unit amplifies the collected electric signal of the detection resistor into an electric signal to be detected and inputs the electric signal to be detected into the limit value comparison unit;

the limit value comparison unit generates an upper limit signal threshold value and a lower limit signal threshold value, compares the electric signal to be detected with the upper limit signal threshold value and the lower limit signal threshold value, and outputs a detection result signal.

15. The method for detecting a high voltage interlock system according to claim 11, wherein the source signal generating module further comprises a first source detecting unit and a second source detecting unit, the first source detecting unit is connected to the first constant power source and the control module, and the second source detecting unit is connected to the second constant power source and the control module;

before the control module inputs the first driving signal and the second driving signal to the signal source generating module, the method for detecting the high-voltage interlock system further includes:

the control module receives a first source detection signal output by the first source detection unit, and if the first source detection signal is determined to be larger than a first source signal threshold value, the first constant power supply is determined to have short-circuit fault;

and the control module receives a second source detection signal output by the second source detection unit, and determines that the second constant power supply has a short-circuit fault if the second source detection signal is greater than a first source signal threshold value.

16. The method for detecting the high-voltage interlock system according to claim 12, wherein the source signal generating module further comprises a first source detecting unit and a second source detecting unit, the first source detecting unit is connected to the first constant power supply and the control module, the second source detecting unit is connected to the second constant power supply and the control module, and the second driving signal is a signal with a duty ratio of 0;

the detection method of the high-voltage interlocking system further comprises the following steps:

the control module receives a first source detection signal output by the first source detection unit, and if the first source detection signal is smaller than a second source signal threshold value, the first constant power supply is determined to have an open-circuit fault;

and if the control module determines that the difference value between the signal of the first power supply source and the first source detection signal is smaller than the second source signal threshold value, determining that the first constant power supply has a short-circuit fault.

17. The method for detecting the high-voltage interlock system according to claim 12, wherein the source signal generating module further comprises a first source detecting unit and a second source detecting unit, the first source detecting unit is connected to the first constant power supply and the control module, the second source detecting unit is connected to the second constant power supply and the control module, and the second driving signal is a signal with a duty ratio of 100%;

the control module receives a second source detection signal output by the second source detection unit, and if the second source detection signal is smaller than a second source signal threshold value, the second constant power supply is determined to have an open-circuit fault;

and if the control module determines that the difference value between the signal of the second power supply source and the second source detection signal is smaller than the second source signal threshold value, determining that the second constant power supply has a short-circuit fault.