WO2022082525A1 - System and method for inspecting working state of main negative relay - Google Patents

Abstract

A system and method for inspecting the working state of a main negative relay. The system comprises a first loop and a level detection circuit (500), the first loop comprising a first DC module (100), a main positive relay (300), a second DC module (200) and a main negative relay (400), which are connected in sequence, and the level detection circuit (500) comprising a first protection device (510), a detection device (520) and a sampling circuit module (530), wherein a first end of the first protection device (510) is connected to a positive electrode of the first DC module (100) and a first end of the main positive relay (300), a second end of the first protection device (510) is connected to a first end of the detection device (520), the sampling circuit module (530) and a first end of the main negative relay (400), and a second end of the detection device (520) is connected to a negative electrode of the first DC module (100) and a second end of the main negative relay (400). A level signal is collected by means of the sampling circuit module (530) to determine the working state of the main negative relay (400), so that the inspection system can report fault information in a timely manner, and the fault determination accuracy is improved.

Description

Main and negative relay working state detection system and detection method technical field

The application relates to the technical field of electric vehicles, and in particular, to a detection system and detection method for the working state of a main negative relay.

Background technique

With the progress of society and the development of science and technology, environmental and energy problems have become increasingly prominent, and the voices for the development and popularization of electric vehicles have become increasingly louder. The mass production and sales of electric vehicles have also begun at home and abroad. As the core component of electric vehicle, the performance of vehicle power battery system directly affects the performance and safety of electric vehicle. In order to ensure the safety and performance of the vehicle power battery system, it is necessary to monitor the relay closing status information in real time.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a system for detecting the working state of a main negative relay and a method for detecting the working state of the main negative relay. The system adopts a level detection circuit. When the car battery provides power, the first level signal at the first end of the detection circuit is detected , and then judge the working state of the main and negative relays, report the fault information in time, and improve the accuracy of fault judgment.

A first aspect of the embodiments of the present application provides a system for detecting a working state of a main negative relay, including a first loop and a level detection circuit, where the first loop includes a first DC module, a main positive relay, and a second DC module connected in sequence and the main negative relay, the level detection circuit includes a first protection device, a detection device and a sampling circuit module, wherein,

The first end of the first protection device is connected to the positive electrode of the first DC module and the first end of the main positive relay, and the second end of the first protection device is connected to the first end of the detection device, the sampling circuit module and the first end of the main negative relay, and the second end of the detection device is connected to the negative electrode of the first DC module and the second end of the main negative relay;

The first protection device is used to prevent the circuit short circuit of the main negative relay working state detection system when the main negative relay is closed, the detection device is used to divide the voltage, and the sampling circuit module is used to collect the detection The first level signal at the first end of the device and the first driving signal of the main negative relay, and according to the difference between the first level signal, the first driving signal and the working state of the main negative relay The mapping relationship determines the working state of the main negative relay corresponding to the first level signal and the first driving signal, the working state includes a normal state and an abnormal state, and the abnormal state includes failure to close and sticking .

In one embodiment, the sampling circuit module includes a micro-control processing module and an amplitude limiting circuit module, wherein,

The positive pole of the first DC module is connected to the first terminal of the main positive relay, the second terminal of the main positive relay is connected to the positive pole of the second DC module, and the negative pole of the second DC module is connected to the main negative pole One end of the relay, the other end of the main negative relay is connected to the negative pole of the first DC module;

The first end of the first protection device is connected to the positive electrode of the first DC module and the first end of the main positive relay, and the second end of the first protection device is connected to the first end of the detection device, The first end of the limiting circuit module and the first end of the main negative relay, the second end of the detection device is connected to the negative electrode of the first DC module and the second end of the main negative relay, so the second end of the limiter circuit module is connected to the micro-control processing module;

The first DC module is used to provide voltage for the circuit of the main negative relay working state detection system, and the main positive relay and the main negative relay are used to control the communication of the circuit of the main negative relay working state detection system. The limiter circuit module is used for overvoltage protection to avoid damage to the micro-control processing module, and the micro-control processing module is used to collect the first level signal at the first end of the detection device and the main negative The first drive signal of the relay, and according to the mapping relationship between the first level signal, the first drive signal and the working state of the main negative relay, the first level signal and the first level signal are determined. A working state of the main negative relay corresponding to a drive signal.

In one embodiment, the limiter circuit module includes a second protection device, a first power supply, a first one-way conduction device and a first resistor, wherein,

The first end of the second protection device is connected to the second end of the first protection device, the first end of the detection device and the first end of the main negative relay, and the second end of the second protection device The terminal is connected to the micro-control processing module and the first terminal of the first resistor, the second terminal of the first resistor is connected to the positive pole of the first one-way conduction device, and the negative pole of the first one-way conduction device Connect the first power source.

In one embodiment, the clipping circuit module includes a third protection device, a second one-way conduction device, a third one-way conduction device, a second power supply, a third power supply, a first switch, a second switch and a second resistor, the third resistor, where,

The first end of the third protection device is connected to the second end of the first protection device, the first end of the detection device and the first end of the main negative relay, and the second end of the third protection device The terminal is connected to the micro-control processing module, the first terminal of the first switch and the first terminal of the second switch, and the second terminal of the first switch is connected to the first terminal of the second resistor, so The second end of the second resistor is connected to the negative electrode of the second unidirectional conduction device, the second switch is connected to the first end of the third resistor, and the second end of the third resistor is connected to the third resistor The anode of the one-way conduction device, the anode of the second one-way conduction device is connected to the cathode of the second power supply, the cathode of the third one-way conduction device is connected to the anode of the third power supply, and the second power supply The positive pole of the third power supply and the negative pole of the third power supply are connected to the second end of the detection device and the negative pole of the first DC module.

In one embodiment, the clipping circuit module includes a fourth power supply, a fourth unidirectional conduction device and a fourth resistor, wherein,

The fourth power supply, the fourth unidirectional conduction device and the fourth resistor are connected in series in sequence and then connected to the second end of the first protection device, the first end of the fourth protection device and the detection device The first end of the device, wherein the anode of the fourth unidirectional conduction device is connected to the fourth power supply;

The fourth power supply is used for providing electrical energy, the fourth one-way conduction device is used for protecting the fourth power supply, and the fourth resistor is used for protecting the micro-control processing module and providing the micro-control processing module bias voltage.

In one embodiment, it also includes a signal detection module, wherein,

the signal detection module is connected to the level detection circuit;

The signal detection module is used to detect the first driving signal of the main negative relay and the second driving signal of the main positive relay, and send the first driving signal and the second driving signal to the microcomputer. Control processing module.

A second aspect of an embodiment of the present application provides a method for detecting the working state of a main negative relay, which is applied to the system for detecting the working state of the main negative relay in the above-mentioned embodiment, and includes a first loop and a level detection circuit, and the first loop includes sequential The connected first DC module, the main positive relay, the second DC module and the main negative relay, the level detection circuit includes a first protection device, a detection device and a sampling circuit module, and the method includes:

Collect the first level signal of the first end of the detection device through the sampling circuit module;

obtaining the first drive signal of the main negative relay;

The working state of the main negative relay is determined according to the first level signal, the first drive signal and a preset relationship, wherein the preset relationship refers to the first level signal, the first drive signal and the preset relationship. The corresponding relationship between the working states of the main and negative relays, the working states include normal states and abnormal states, and the abnormal states include inability to close and sticking.

In one embodiment, after collecting the first level signal of the first end of the detection device by the sampling circuit module, the method further includes:

The opening and closing state of the main negative relay corresponding to the first level signal is determined according to the mapping relationship between the first level signal and the opening and closing state of the main negative relay, and the opening and closing state of the main negative relay is determined. States include open and closed.

In one embodiment, the sampling circuit module includes a micro-control processing module and an amplitude limiting circuit module, and before acquiring the first driving signal of the main negative relay, the method further includes:

The first driving signal of the main negative relay is detected and the first driving signal is sent to the micro-control processing module.

In one embodiment, the working state of the main negative relay is determined according to the first level signal, the first driving signal and a preset relationship, wherein the preset relationship refers to a first level The corresponding relationship between the signal, the first driving signal and the working state of the main negative relay, the working state includes a normal state and an abnormal state, and the abnormal state includes inability to close and sticking, including:

When the first level signal is at a high level and the main negative relay has a first drive signal, it is determined that the main negative relay cannot be closed;

When the first level signal is at a high level and the main negative relay has no first drive signal, it is determined that the main negative relay is normally disconnected;

When the first level signal is a low level and the main negative relay has a first drive signal, it is judged that the main negative relay is normally closed;

When the first level signal is at a low level and the main negative relay has no first drive signal, it is determined that the main negative relay is stuck dead.

In this application, the main negative relay working state detection system includes a first loop and a level detection circuit, the first loop includes a first DC module, a main positive relay, a second DC module and a main negative relay connected in sequence, so The level detection circuit includes a first protection device, a detection device and a sampling circuit module, wherein the first end of the first protection device is connected to the positive electrode of the first DC module and the first end of the main positive relay, The second end of the first protection device is connected to the first end of the detection device, the sampling circuit module and the first end of the main negative relay, and the second end of the detection device is connected to the first DC The negative pole of the module and the second end of the main negative relay; the first protection device is used to prevent circuit short circuit when the main negative relay is closed, the detection device is used to divide the voltage, and the sampling circuit module is used to Collect the first level signal of the first end of the detection device and the first driving signal of the main negative relay, and according to the first level signal, the first driving signal and the operation of the main negative relay The mapping relationship between the states determines the working state of the main negative relay corresponding to the first level signal and the first driving signal, and the working state includes a normal state and an abnormal state. It can be seen that the main negative relay working state detection system is based on the first level signal of the first end of the detection device and the first driving signal of the main negative relay, as well as the first level signal and the first driving signal. The mapping relationship with the working state of the main and negative relays determines the working state of the main and negative relays, so that the detection system can report fault information in time and improve the accuracy of fault judgment.

These and other aspects of the present application will be more clearly understood in the description of the following embodiments.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the accompanying drawings involved in the embodiments or the background technology of the present application will be briefly introduced below.

The accompanying drawings involved in the embodiments of the present application will be briefly introduced below.

1 is a schematic diagram of a main negative relay working state detection system provided by an embodiment of the present application;

2 is a schematic diagram of a second main and negative relay working state detection system provided by an embodiment of the present application;

3 is a schematic diagram of a third main and negative relay working state detection system provided by an embodiment of the present application;

Fig. 4 is the schematic diagram of the fourth main negative relay working state detection system provided by the embodiment of the present application;

5 is a schematic diagram of a fifth main and negative relay working state detection system provided by an embodiment of the present application;

6 is a schematic diagram of a sixth main and negative relay working state detection system provided by an embodiment of the present application;

7 is a schematic diagram of a seventh main and negative relay working state detection system provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of a method for detecting a working state of a main and negative relay provided by an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

Each of them will be described in detail below.

The terms "first", "second", "third" and "fourth" in the description and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

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 the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

As the core component of electric vehicle, the performance of vehicle power battery system directly affects the performance and safety of electric vehicle. In order to ensure the safety and performance of the vehicle power battery system and reduce the safety hazards of the vehicle, when the vehicle relay fails, it is necessary to judge the relay status and fault location information in time. However, the existing relay detection equipment has low fault location efficiency and accuracy, and Failure to report fault information in time.

In view of the above problems, an embodiment of the present application proposes a main negative relay working state detection system and a detection method. The main negative relay working state detection system includes a first loop and a level detection circuit, and the first loop includes a first loop connected in sequence. A DC module, a main positive relay, a second DC module and a main negative relay, the level detection circuit includes a first protection device, a detection device and a sampling circuit module, wherein a first end of the first protection device is connected to the The positive electrode of the first DC module and the first end of the main positive relay, the second end of the first protection device is connected to the first end of the detection device, the sampling circuit module and the first end of the main negative relay. one end, the second end of the detection device is connected to the negative electrode of the first DC module and the second end of the main negative relay; the first protection device is used to prevent the main negative relay from causing the The circuit of the main negative relay working state detection system is short-circuited, the detection device is used to divide the voltage, and the sampling circuit module is used to collect the first level signal of the first end of the detection device and the first level signal of the main negative relay. drive signal, and according to the first level signal, the mapping relationship between the first drive signal and the working state of the main negative relay, determine that the first level signal and the first drive signal correspond to The working state of the main negative relay, the working state includes a normal state and an abnormal state, and the abnormal state includes failure to close and sticking. It can be seen that the main negative relay working state detection system is based on the first level signal of the first end of the detection device and the first driving signal of the main negative relay, as well as the first level signal and the first driving signal. The mapping relationship with the working state of the main and negative relays determines the working state of the main and negative relays, so that the detection system can report fault information in time and improve the accuracy of fault judgment.

The embodiments of the present application will be introduced below with reference to the accompanying drawings.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a main negative relay working state detection system provided by an embodiment of the present application. The main negative relay working state detection system includes a first loop and a level detection circuit 500. The first loop It includes a first DC module 100, a main positive relay 300, a second DC module 200 and a main negative relay 400 connected in sequence. The level detection circuit 500 includes a first protection device 510, a detection device 520 and a sampling circuit module 530, wherein ,

The first end of the first protection device 510 is connected to the positive electrode of the first DC module 100 and the first end of the main positive relay 300 , and the second end of the first protection device 510 is connected to the detection device 520 The first end of the sampling circuit module 530 and the first end of the main negative relay 400, the second end of the detection device 520 is connected to the negative electrode of the first DC module 100 and the main negative relay 400 second end;

The first protection device 510 is used to prevent the circuit short circuit of the main negative relay working state detection system when the main negative relay 400 is closed, the detection device 520 is used to divide the voltage, and the sampling circuit module 530 is used to Collect the first level signal of the first end of the detection device 520 and the first driving signal of the main negative relay 400, and according to the first level signal, the first driving signal and the main negative relay The mapping relationship between the working states of 400 determines the working state of the main negative relay 400 corresponding to the first level signal and the first driving signal, the working state includes a normal state and an abnormal state, and the Abnormal states include inability to close and sticking.

In specific implementation, the first DC module 100 may include a power battery, a storage battery, a parking distance control system, an integrated motor control, etc., and the second DC module 200 may include an on-board charger, a vehicle controller, and a fast charging interface , heater and DC-DC converter, etc.; the first protection device 510 can be a voltage divider or a current limiting device; the detection device 520 can divide the voltage, and the detection device 520 can be a voltage divider or the like.

Wherein, when the main negative relay 400 is closed, the first level signal collected by the sampling circuit module 530 is low level, and when the main negative relay 400 is disconnected, the first level signal collected by the sampling circuit module 530 is high level. When the first level signal collected by the sampling circuit module 530 is a low level and the first driving signal does not exist, the main negative relay 400 is abnormal, that is, in a sticky state; the sampling circuit module 530 collects When the first level signal is low and the first driving signal exists, the main negative relay 400 is normal, that is, normally closed; the first level signal collected by the sampling circuit module 530 is high When the first drive signal does not exist, the main negative relay 400 is normal, that is, normally disconnected; the first level signal collected by the sampling circuit module 530 is high level, and the first When the driving signal exists, the main negative relay 400 is abnormal, that is, cannot be normally closed.

It can be seen that in this example, the detection system collects the first level signal of the first end of the detection device 520 through the sampling circuit module 530 , according to the first level signal and the main negative relay 400 The first driving signal judges the working state of the main negative relay 400, so as to detect the abnormal state of the main negative relay 400 in time and improve the accuracy of fault judgment.

As a possible implementation manner, please refer to FIG. 2 , the sampling circuit module 530 includes a micro-control processing module 532 and an amplitude limiting circuit module 531, wherein,

The positive pole of the first DC module 100 is connected to the first end of the main positive relay 300 , the second end of the main positive relay 300 is connected to the positive pole of the second DC module 200 , and the negative pole of the second DC module 200 is connected one end of the main negative relay 400 is connected, and the other end of the main negative relay 400 is connected to the negative electrode of the first DC module 100;

The first end of the first protection device 510 is connected to the positive electrode of the first DC module 100 and the first end of the main positive relay 300 , and the second end of the first protection device 510 is connected to the detection device 520 The first end of the limiter circuit module 531 and the first end of the main negative relay 400, the second end of the detection device 520 is connected to the negative electrode of the first DC module 100 and the The second end of the main negative relay 400, the second end of the limiter circuit module 531 is connected to the micro-control processing module 532;

The first DC module 100 is used to provide voltage for the circuit of the main negative relay working state detection system, the main positive relay 300 and the main negative relay 400 are used to control the on-off of the circuit, and the limiter circuit The module 531 is used for over-voltage protection to avoid damage to the micro-control processing module 532, and the micro-control processing module 532 is used to collect the first level signal of the first end of the detection device 520 and the signal of the main negative relay 400. the first drive signal, and according to the first level signal, the mapping relationship between the first drive signal and the working state of the main negative relay 400, the first level signal and the first The working state of the main negative relay 400 corresponding to the driving signal.

Among them, the micro-control processing module 532 can be MCU_SMP, and the Chinese name of MCU (Micro Control Unit) is micro-control unit, which integrates the CPU, RAM, ROM, timer counter and various I/O interfaces of the computer on a chip , form a chip-level computer, and do different combination controls for different applications. SMP refers to a collection of processors on a computer. The limiter circuit module 531 may only be composed of a limiter device, or may be composed of a limiter circuit.

Wherein, the micro-control processing module 532 can be connected to the first end of the detection device 520 through the I/O interface to collect a first level signal, and according to the first level signal and the working state of the main negative relay 400 The mapping relationship between them determines the opening and closing state of the main negative relay 400. For example, when the first level signal is at a high level, the main negative relay 400 is in an off state.

It can be seen that, in this example, the first level signal of the first end of the detection device 520 is collected by the micro-control processing module 532 to determine the corresponding working state of the main negative relay 400, and the operation state of the main negative relay 400 can be accurately determined. The working state, and the circuit is simple, the cost is low.

As a possible implementation manner, please refer to FIG. 3 , the limiting circuit module includes a second protection device 5311 , a first power supply 5312 , a first one-way conduction device 5313 and a first resistor 5314 , wherein the second The first end of the protection device 5311 is connected to the second end of the first protection device 510 , the first end of the detection device 520 and the first end of the main negative relay 400 . The two ends are connected to the micro-control processing module 532 and the first end of the first resistor 5314, the second end of the first resistor 5314 is connected to the positive electrode of the first one-way conducting device 5313, and the first one The first power source 5312 is connected to the negative electrode of the conduction device 5313 .

The limiting circuit module includes a second protection device 5311, a first one-way conduction device 5313 and a first power supply 5312, the second protection device 5311 may be a current limiting resistor, and the first one-way conduction device 5313 may be diode. In a specific implementation, when both the first DC module 100 and the second DC module 200 cannot supply power, the first power supply supplies power to the detection system circuit, and the first resistor acts as a pull-up resistor to prevent the circuit from being damaged , to ensure circuit safety.

It can be seen that, in this example, the limiter circuit module can avoid damage to the sampling chip in the micro-control processing module due to excessive voltage and reverse connection of the first DC module 100 or the second DC module 200, and the circuit is simple.

As a possible implementation, please refer to FIG. 4 , the limiter circuit module includes a third protection device 5315 , a second one-way conduction device 5316 , a third one-way conduction device 5317 , a second power supply 5318 , and a third power supply 5319, the first switch 5320, the second switch 5321, the second resistor 5322, the third resistor 5323, wherein,

The first end of the third protection device 5315 is connected to the second end of the first protection device 510, the first end of the detection device 520 and the first end of the main negative relay 400, the third protection The second end of the device 5315 is connected to the micro-control processing module 532, the first end of the first switch 5320 and the first end of the second switch 5321, and the second end of the first switch 5320 is connected to the The first end of the second resistor 5322, the second end of the second resistor 5322 is connected to the negative electrode of the second one-way conducting device 5316, the second switch 5321 is connected to the first end of the third resistor 5323, The second end of the third resistor 5323 is connected to the positive electrode of the third one-way conducting device 5317, the positive electrode of the second one-way conducting device 5316 is connected to the negative electrode of the second power supply 5318, and the third one-way conducting device 5318 The negative pole of the pass device 5317 is connected to the positive pole of the third power supply 5319, the positive pole of the second power supply 5318 and the negative pole of the third power supply 5319 are connected to the second end of the detection device 520 and the first DC module 100 the negative pole.

Wherein, the third protection device 5314 may be a current limiting resistor, the second one-way conduction device 5316 and the third one-way conduction device 5317 may be diodes, and the second power supply 5318 and the third power supply 5319 may be DC Power supply, when the first DC module 100 and the second DC module 200 cannot supply power, the second resistor 5322 and the third resistor 5323 are used as pull-up resistors, which can ensure circuit safety and improve circuit stability. The first switch 5320 and the second switch 5321 can switch the power supply, can obtain detection results under multiple power sources, and can improve the accuracy of the detection system.

It can be seen that, in this example, the limiter circuit module can avoid damage to the sampling chip in the micro-control processing module due to excessive voltage and reverse connection of the first DC module 100 or the second DC module 200, and the circuit is simple.

As a possible implementation, please refer to FIG. 5. FIG. 5 is a schematic diagram of another main negative relay working state detection system provided by an embodiment of the present application. The limiter circuit module includes a fourth power supply 5327, a fourth single to pass device 5326 and fourth resistor 5325, where,

The fourth power supply 5327 , the fourth unidirectional conduction device 5326 and the fourth resistor 5325 are connected in series in sequence and then connected to the second end of the first protection device 510 and the first end of the fourth protection device 5324 and the first end of the detection device 520, wherein the anode of the fourth unidirectional conduction device 5326 is connected to the fourth power supply 5327;

The fourth power supply 5327 is used to provide power, the fourth unidirectional conduction device 5326 is used to protect the fourth power supply, and the fourth resistor 5325 is used to protect the micro-control processing module 532 and provide power for the micro-controller. The control processing module 532 provides the bias voltage.

The fourth power supply 5327 provides a bias voltage for the micro-control processing module 532 through the fourth resistor 5325, and the fourth resistor 5325 serves as a pull-up resistor. Through the fourth unidirectional conduction device 5326, the third power supply 5327 can be prevented from being damaged due to the high voltage of the detection system circuit, and the accuracy of the measurement and processing voltage of the microcontroller processing module can be prevented from being affected.

It can be seen that in this example, the main negative relay working state detection system sets the fourth power supply 5327 to provide power supply voltage for the detection system circuit, and judges the working state of the main negative relay 400 and improves the fault judgment accuracy by detecting the system circuit voltage.

As a possible implementation manner, please refer to FIG. 6 , which is a schematic diagram of another working state detection system of a main negative relay provided by an embodiment of the present application. The level detection circuit 500 includes a sixth resistor 5332 , a detection device 520 and a sampling circuit module 530, the sampling circuit module 530 includes the micro-control processing module 532, a fifth protection device 5328, a fifth resistor 5329, a fifth one-way conduction device 5330 and a fifth power supply 5331, wherein,

The fifth power source 5331 is connected to the first end of the fifth one-way conduction device 5330 , the second end of the fifth one-way conduction device 5330 is connected to the first end of the fifth resistor 5329 , and the second end of the fifth resistor 5329 Connect the fifth protection device 5328, the detection device 520 and the first end of the sixth resistor 5332, the second end of the fifth protection device 5328 is connected to the micro-control processing module 532, the detection device 520 The second terminal is connected to the negative terminal of the first DC module 100 and the second terminal of the main negative relay 400, and the second terminal of the sixth resistor 5332 is connected to the negative terminal of the second DC module 200 and the main negative relay 400. The first terminal of the relay 400 .

The fifth resistor 5329 is used as a pull-up resistor, and the sixth resistor 5332 is used as a protection resistor to stabilize the circuit of the main negative relay working state detection system when the main negative relay 400 is closed. The device 520 is used for voltage division, and the micro-control processing module 532 is used for collecting the first level signal of the first end of the detection device 520 and the first driving signal of the main negative relay 400, and according to the first The mapping relationship between the level signal, the first drive signal and the working state of the main negative relay 400 determines the level of the main negative relay 400 corresponding to the first level signal and the first drive signal. Working state, the working state includes normal state and abnormal state, and the abnormal state includes unable to be closed and stuck.

It can be seen that, in this example, by setting the fifth power source 5331, the main negative relay working state detection system can determine the working state of the main negative relay 400 and improve the accuracy of fault determination.

As a possible implementation manner, as shown in FIG. 7 , the main negative relay working state detection system further includes a signal detection module 540, wherein the signal detection module 540 is connected to the level detection circuit 500; the signal The detection module 540 is configured to detect the first driving signal of the main negative relay 400 and the second driving signal of the main positive relay 300, and send the first driving signal and the second driving signal to the microcomputer. The processing module 532 is controlled.

Wherein, when the first driving signal of the main negative relay 400 and the second driving signal of the main positive relay 300 are sent by the micro-control processing module 532, the first driving signal and the second driving signal may be It is detected by the micro-control processing module 532 or the signal detection module 540; when the first driving signal and the second driving signal are sent by other controllers, they are detected by the signal detection module 540, and then sent to The micro-control processing module 532 .

Wherein, when the second driving signal is detected, the main positive relay 300 is closed, and when the main negative relay 400 is opened or closed, the second DC module 200 is connected in parallel with the first protection device 510, so , the opening or closing of the main positive relay 300 has no effect on the first level signal at the first end of the detection device 520 .

It can be seen that, in this example, the signal detection module 540 can detect the first driving signal and the second driving signal under various conditions, so as to determine the working state of the main negative relay 400 in combination with the first level signal, Improve the accuracy of relay fault judgment.

Please refer to FIG. 8. FIG. 8 is a schematic flowchart of a method for detecting a working state of a main negative relay provided by an embodiment of the present application, which is applied to a system for detecting a working state of a main negative relay, including a first loop and a level detection circuit. A circuit includes a first DC module, a main positive relay, a second DC module and a main negative relay connected in sequence, the level detection circuit includes a first protection device, a detection device and a sampling circuit module, and the method includes:

S801, collecting a first level signal of a first end of the detection device through the sampling circuit module;

S802, obtaining the first drive signal of the main negative relay;

S803: Determine the working state of the main negative relay according to the first level signal, the first drive signal and a preset relationship, wherein the preset relationship refers to the first level signal, the The mapping relationship between the first drive signal and the working state of the main negative relay, where the working state includes a normal state and an abnormal state, and the abnormal state includes failure to close and sticking.

Wherein, taking the first level signal as a query identifier, query the mapping relationship between the first level signal and the opening and closing states of the main negative relay, and the mapping relationship includes the first level signal The corresponding relationship with the opening and closing state of the main negative relay; determine the opening and closing state of the main negative relay according to the mapping relationship, and then judge the opening and closing state according to the opening and closing state and the first driving signal of the main negative relay Check whether the main negative relay is in normal working condition.

It can be seen that in this example, the detection system collects the first level signal of the first end of the detection device through the sampling circuit module, and according to the first level signal and the first drive of the main negative relay The signal judges the working state of the main negative relay, so as to detect the abnormal state of the main negative relay in time and improve the accuracy of the fault determination of the main negative relay.

As a possible implementation manner, after collecting the first level signal of the first end of the detection device through the sampling circuit module, the method further includes: according to the first level signal and the main negative relay The mapping relationship between the opening and closing states determines the opening and closing states of the main negative relay corresponding to the first level signal, and the opening and closing states include opening and closing.

Wherein, when it is detected that the first level signal is at a high level, it is judged that the working state of the main negative relay is disconnected; when it is detected that the first level signal is at a low level, it is judged that the main negative relay has The working state is closed.

It can be seen that in this example, the first level signal of the first end of the detection device is collected by the sampling circuit module, according to the mapping between the first level signal and the opening and closing states of the main negative relay relationship, to obtain the opening and closing state of the main negative relay corresponding to the first level signal, so as to determine whether the working state of the main negative relay is normal.

As a possible implementation manner, the sampling circuit module includes a micro-control processing module and an amplitude limiting circuit module. Before acquiring the first driving signal of the main negative relay, the method further includes: detecting the first driving signal of the main negative relay. a driving signal and sending the first driving signal to the micro-control processing module.

It can be seen that the working state of the main negative relay is judged according to the first level signal and the first driving signal of the main negative relay, so as to detect the abnormal state of the main negative relay in time and report the fault information in time, Improve the accuracy of main and negative relay fault determination.

As a possible implementation manner, the working state of the main negative relay is determined according to the first level signal, the first driving signal and a preset relationship, wherein the preset relationship refers to the first The corresponding relationship between the level signal, the first drive signal and the working state of the main negative relay, the working state includes a normal state and an abnormal state, and the abnormal state includes failure to close and sticking, including: when the The first level signal is high level, and when the main negative relay has the first drive signal, it is determined that the main negative relay cannot be closed; when the first level signal is high level, the main negative relay does not When the first driving signal is used, it is determined that the main negative relay is normally disconnected; when the first level signal is low and the main negative relay has the first driving signal, it is determined that the main negative relay is normally closed; When the first level signal is at a low level and the main negative relay has no first drive signal, it is determined that the main negative relay is stuck dead.

Among them, the first level signal, the opening and closing state of the main negative relay, the first driving signal and the working state of the main negative relay are shown in Table 1:

Table 1

first level signal	first drive signal	open and closed state	working status
high	Have	disconnect	abnormal, unable to close
high	none	disconnect	normal, disconnected
Low	Have	closure	normal, closed
Low	none	closure	abnormal, sticky

It can be seen that in this example, the detection system judges the working state of the main negative relay according to the first level signal and the first driving signal, so as to improve the timeliness and efficiency of detecting the abnormal state of the main negative relay. The accuracy of the fault determination for the main and negative relays.

It should be noted that, for the sake of simple description, the foregoing application embodiments are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Because in accordance with the present application, certain steps may be performed in other orders or concurrently. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

The above content and structure describe the basic principles, main features and advantages of the present invention, and the principles and implementations of the present application are described with specific examples herein. The application and its core idea; at the same time, for those skilled in the art, according to the idea of the application, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a reference to the application. limits.

Claims (10)

1. A main negative relay working state detection system, characterized in that it includes a first loop and a level detection circuit, wherein the first loop includes a first DC module, a main positive relay, a second DC module and a main negative relay connected in sequence , the level detection circuit includes a first protection device, a detection device and a sampling circuit module, wherein,

   The first end of the first protection device is connected to the positive electrode of the first DC module and the first end of the main positive relay, and the second end of the first protection device is connected to the first end of the detection device, the sampling circuit module and the first end of the main negative relay, and the second end of the detection device is connected to the negative electrode of the first DC module and the second end of the main negative relay;

   The first protection device is used to prevent the circuit short circuit of the main negative relay working state detection system when the main negative relay is closed, the detection device is used to divide the voltage, and the sampling circuit module is used to collect the detection The first level signal at the first end of the device and the first driving signal of the main negative relay, and according to the difference between the first level signal, the first driving signal and the working state of the main negative relay The mapping relationship determines the working state of the main negative relay corresponding to the first level signal and the first driving signal, the working state includes a normal state and an abnormal state, and the abnormal state includes failure to close and sticking .
2. The main negative relay working state detection system according to claim 1, wherein the sampling circuit module comprises a micro-control processing module and an amplitude limiting circuit module, wherein,

   The positive pole of the first DC module is connected to the first terminal of the main positive relay, the second terminal of the main positive relay is connected to the positive pole of the second DC module, and the negative pole of the second DC module is connected to the main negative pole One end of the relay, the other end of the main negative relay is connected to the negative electrode of the first DC module;

   The first end of the first protection device is connected to the positive electrode of the first DC module and the first end of the main positive relay, and the second end of the first protection device is connected to the first end of the detection device, The first end of the limiting circuit module and the first end of the main negative relay, the second end of the detection device is connected to the negative electrode of the first DC module and the second end of the main negative relay, so the second end of the limiter circuit module is connected to the micro-control processing module;

   The first DC module is used to provide voltage for the circuit of the main negative relay working state detection system, and the main positive relay and the main negative relay are used to control the communication of the circuit of the main negative relay working state detection system. The limiter circuit module is used for overvoltage protection to avoid damage to the micro-control processing module, and the micro-control processing module is used to collect the first level signal at the first end of the detection device and the main negative The first drive signal of the relay, and according to the mapping relationship between the first level signal, the first drive signal and the working state of the main negative relay, the first level signal and the first level signal are determined. A working state of the main negative relay corresponding to a drive signal.
3. The main negative relay working state detection system according to claim 2, wherein the limiter circuit module comprises a second protection device, a first power supply, a first one-way conduction device and a first resistor, wherein,

   The first end of the second protection device is connected to the second end of the first protection device, the first end of the detection device and the first end of the main negative relay, and the second end of the second protection device The terminal is connected to the micro-control processing module and the first terminal of the first resistor, the second terminal of the first resistor is connected to the positive pole of the first one-way conduction device, and the negative pole of the first one-way conduction device Connect the first power source.
4. The main negative relay working state detection system according to claim 2, wherein the limiter circuit module comprises a third protection device, a second one-way conduction device, a third one-way conduction device, a second power supply, a third Three power sources, a first switch, a second switch, and a second resistor and a third resistor, wherein,

   The first end of the third protection device is connected to the second end of the first protection device, the first end of the detection device and the first end of the main negative relay, and the second end of the third protection device The terminal is connected to the micro-control processing module, the first terminal of the first switch and the first terminal of the second switch, and the second terminal of the first switch is connected to the first terminal of the second resistor, so The second end of the second resistor is connected to the negative electrode of the second unidirectional conduction device, the second switch is connected to the first end of the third resistor, and the second end of the third resistor is connected to the third resistor The anode of the one-way conduction device, the anode of the second one-way conduction device is connected to the cathode of the second power supply, the cathode of the third one-way conduction device is connected to the anode of the third power supply, and the second power supply The positive pole of the third power supply and the negative pole of the third power supply are connected to the second end of the detection device and the negative pole of the first DC module.
5. The main negative relay working state detection system according to claim 2, wherein the limiter circuit module comprises a fourth power supply, a fourth one-way conducting device and a fourth resistor, wherein,

   The fourth power supply, the fourth unidirectional conduction device and the fourth resistor are connected in series in sequence and then connected to the second end of the first protection device, the first end of the fourth protection device and the detection device The first end of the device, wherein the anode of the fourth unidirectional conduction device is connected to the fourth power supply;

   The fourth power supply is used for providing electrical energy, the fourth one-way conduction device is used for protecting the fourth power supply, and the fourth resistor is used for protecting the micro-control processing module and providing the micro-control processing module bias voltage.
6. The main negative relay working state detection system according to any one of claims 1-5, characterized in that, further comprising a signal detection module, wherein,

   the signal detection module is connected to the level detection circuit;

   The signal detection module is used to detect the first driving signal of the main negative relay and the second driving signal of the main positive relay, and send the first driving signal and the second driving signal to the microcomputer. Control processing module.
7. A method for detecting the working state of a main negative relay, characterized in that it is applied to the system for detecting the working state of the main negative relay according to any one of claims 1-6, comprising a first loop and a level detection circuit, the first loop It includes a first DC module, a main positive relay, a second DC module and a main negative relay connected in sequence, the level detection circuit includes a first protection device, a detection device and a sampling circuit module, and the method includes:

   Collect the first level signal of the first end of the detection device by the sampling circuit module;

   obtaining the first drive signal of the main negative relay;

   The working state of the main negative relay is determined according to the first level signal, the first drive signal and a preset relationship, wherein the preset relationship refers to the first level signal, the first drive signal and the preset relationship. The corresponding relationship between the working states of the main and negative relays, the working states include normal states and abnormal states, and the abnormal states include inability to close and sticking.
8. The method for detecting the working state of the main negative relay according to claim 7, characterized in that after collecting the first level signal of the first end of the detecting device through the sampling circuit module, the method further comprises:

   According to the mapping relationship between the first level signal and the opening and closing state of the main negative relay, the opening and closing state of the main negative relay corresponding to the first level signal is determined, and the opening and closing state includes open and close.
9. The method for detecting the working state of the main negative relay according to claim 7 or 8, wherein the sampling circuit module comprises a micro-control processing module and an amplitude limiting circuit module, and the acquiring the first driving signal of the main negative relay Before, also included:

   The first driving signal of the main negative relay is detected and the first driving signal is sent to the micro-control processing module.
10. The method for detecting the working state of the main negative relay according to claim 7, wherein the determining the working state of the main negative relay according to the first level signal, the first driving signal and a preset relationship, The preset relationship refers to the corresponding relationship between the first level signal, the first driving signal and the working state of the main negative relay, the working state includes a normal state and an abnormal state, and the abnormal state includes Inability to close and stick, including:

    When the first level signal is at a high level and the main negative relay has a first drive signal, it is determined that the main negative relay cannot be closed;

    When the first level signal is at a high level and the main negative relay has no first drive signal, it is determined that the main negative relay is normally disconnected;

    When the first level signal is at a low level and the main negative relay has a first drive signal, it is determined that the main negative relay is normally closed;

    When the first level signal is at a low level and the main negative relay has no first driving signal, it is determined that the main negative relay is stuck dead.

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