阅读说明：本技术 主负继电器工作状态检测系统和检测方法 (System and method for detecting working state of main and negative relays ) 是由 刘鹏飞 罗乐 吴壬华 于 2020-10-21 设计创作，主要内容包括：一种主负继电器工作状态检测系统和检测方法,包括第一回路和电平检测电路(500),所述第一回路包括依次连接的第一DC模块(100)、主正继电器(300)、第二DC模块(200)和主负继电器(400),所述电平检测电路(500)包括第一保护器件(510)、检测器件(520)和采样电路模块(530),其中,所述第一保护器件(510)的第一端连接所述第一DC模块(100)的正极和所述主正继电器(300)的第一端,所述第一保护器件(510)的第二端连接所述检测器件(520)的第一端、所述采样电路模块(530)和所述主负继电器(400)的第一端,所述检测器件(520)的第二端连接所述第一DC模块(100)的负极和所述主负继电器(400)的第二端。通过采样电路模块(530)采集电平信号确定所述主负继电器(400)的工作状态,以便于所述检测系统及时上报故障信息,提高故障判断准确度。(A system and a method for detecting the working state of a main relay and a negative relay comprise a first loop and a level detection circuit (500), the first loop comprises 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, the level detection circuit (500) comprises a first protection device (510), a detection device (520) and a sampling circuit module (530), wherein a first terminal of the first protection device (510) is connected to a positive terminal of the first DC module (100) and a first terminal of the main positive relay (300), a second terminal of the first protection device (510) is connected to a first terminal of the detection device (520), the sampling circuit module (530), and a first terminal of the main negative relay (400), a second terminal of the detection device (520) is connected to a negative terminal of the first DC module (100) and a second terminal of the main negative relay (400). Level signals are collected through a sampling circuit module (530) to determine the working state of the main and negative relays (400), so that the detection system can report fault information in time, and the fault judgment accuracy is improved.)

1. The working state detection system of the main negative relay is characterized by comprising a first loop and a level detection circuit, wherein the first loop comprises a first DC module, a main positive relay, a second DC module and a main negative relay which are sequentially connected, the level detection circuit comprises a first protection device, a detection device and a sampling circuit module, wherein,

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

the first protection device is used for preventing cause when main negative relay is closed main negative relay operating condition detecting system's circuit short circuit, the detection device is used for the partial pressure, the sampling circuit module is used for gathering the first level signal of the first end of detection device with the first drive signal of main negative relay, and according to first level signal first drive signal with mapping relation between the operating condition of main negative relay confirms first level signal with first drive signal corresponds the operating condition of main negative relay, operating condition includes normal condition and abnormal state, abnormal state includes unable closure and adhesion.

2. The system for detecting the working state of a main relay and a negative relay as claimed in claim 1, wherein the sampling circuit module comprises a micro-control processing module and a limiting circuit module, wherein,

the positive pole of the first DC module is connected with the first end of the main positive relay, the second end of the main positive relay is connected with the positive pole of the second DC module, the negative pole of the second DC module is connected with one end of the main negative relay, and the other end of the main negative relay is connected with the negative pole of the first DC module;

the first end of the first protection device is connected with 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 with the first end of the detection device, the first end of the amplitude limiting circuit module and the first end of the main negative relay, the second end of the detection device is connected with the negative electrode of the first DC module and the second end of the main negative relay, and the second end of the amplitude limiting circuit module is connected with the micro-control processing module;

the first DC module is used for providing voltage for a circuit of the working state detection system of the main negative relay, the main positive relay and the main negative relay are used for controlling the on-off of the circuit of the working state detection system of the main negative relay, the amplitude limiting circuit module is used for overvoltage protection and avoiding the damage of the micro-control processing module, the micro-control processing module is used for collecting a first level signal of a first end of the detection device and a first driving signal of the main negative relay and determining the working state of the main negative relay corresponding to the first level signal and the first driving signal according to the mapping relation among the first level signal, the first driving signal and the working state of the main negative relay.

3. The system for detecting the working state of a main relay and a negative relay as claimed in claim 2, wherein the amplitude limiting 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 second protection device is connected the second end of first protection device the first end of detection device with the first end of main negative relay, the second end of second protection device is connected little control processing module with the first end of first resistance, the second end of first resistance is connected the positive pole of first one-way conduction device, the negative pole of first one-way conduction device is connected first power.

4. The system for detecting the working state of a main relay and a negative relay as claimed in claim 2, wherein the amplitude limiting 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 power supply, a first switch, a second resistor and a third resistor, wherein,

the first end of the third protection device is connected with the second end of the first protection device, the first end of the detection device and the first end of the main negative relay, the second end of the third protection device is connected with the micro-control processing module, the first end of the first switch and the first end of the second switch, the second end of the first switch is connected with the first end of the second resistor, the second end of the second resistor is connected with the cathode of the second unidirectional conducting device, the second switch is connected with the first end of the third resistor, the second end of the third resistor is connected with the anode of the third unidirectional conducting device, the anode of the second unidirectional conducting device is connected with the cathode of the second power supply, the cathode of the third unidirectional conducting device is connected with the anode of the third power supply, the anode of the second power supply and the cathode of the third power supply are connected to the second end of the detection device and the cathode of the first DC module.

5. The system for detecting the working state of a main relay and a negative relay as claimed in claim 2, wherein the amplitude limiting circuit module comprises a fourth power supply, a fourth one-way conduction device and a fourth resistor, wherein,

the fourth power supply, the fourth unidirectional conducting device and the fourth resistor are sequentially connected in series and then connected with the second end of the first protection device, the first end of the fourth protection device and the first end of the detection device, wherein the anode of the fourth unidirectional conducting device is connected with the fourth power supply;

the fourth power supply is used for providing electric 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 bias voltage for the micro-control processing module.

6. The system for detecting the working state of a main relay and a negative relay according to any one of claims 1 to 5, further comprising a signal detection module, wherein,

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

the signal detection module is used for detecting a first driving signal of the main negative relay and a second driving signal of the main positive relay and sending the first driving signal and the second driving signal to the micro-control processing module.

7. A method for detecting the working state of a main negative relay is applied to a system for detecting the working state of the main negative relay, which comprises a first loop and a level detection circuit, wherein the first loop comprises a first DC module, a main positive relay, a second DC module and a main negative relay which are sequentially connected, the level detection circuit comprises a first protection device, a detection device and a sampling circuit module, and the method comprises the following steps:

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

acquiring a first driving signal of the main and negative relays;

and determining the working state of the main and negative relay according to the first level signal, the first driving signal and a preset relation, wherein the preset relation refers to the corresponding relation among the first level signal, the first driving signal and the working state of the main and negative relay, the working state comprises a normal state and an abnormal state, and the abnormal state comprises the conditions of incapability of closing and sticking.

8. The method for detecting the working state of the main relay and the negative relay as claimed in claim 7, further comprising, after the sampling circuit module collects the first level signal of the first terminal of the detection device:

and determining the opening and closing states of the main and negative relays corresponding to the first level signal according to the mapping relation between the first level signal and the opening and closing states of the main and negative relays, wherein the opening and closing states comprise opening and closing.

9. The method for detecting the working state of the main relay and the negative relay as claimed in claim 7 or 8, wherein the sampling circuit module comprises a micro-control processing module and a limiting circuit module, and before acquiring the first driving signal of the main relay and the negative relay, the method further comprises:

and detecting a first driving signal of the main and negative relays and sending the first driving signal to the micro-control processing module.

10. The method for detecting the working state of the main and negative relays according to claim 7, wherein the determining the working state of the main and negative relays according to the first level signal, the first driving signal and a preset relationship, wherein the preset relationship refers to a corresponding relationship between the first level signal, the first driving signal and the working state of the main and negative relays, the working state includes a normal state and an abnormal state, and the abnormal state includes a failure to close and a sticking state, includes:

when the first level signal is at a high level and the main and negative relays have first driving signals, determining that the main and negative relays cannot be closed;

when the first level signal is at a high level and the main and negative relays do not have a first driving signal, determining that the main and negative relays are normally switched off;

when the first level signal is at a low level and the main and negative relays have a first driving signal, determining that the main and negative relays are normally closed;

and when the first level signal is at a low level and the main and negative relays have no first driving signal, determining that the main and negative relays are stuck.

Technical Field

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

Background

With the progress of society and the development of science and technology, environmental and energy problems are increasingly prominent, the demand for the development and popularization of electric vehicles is increasing, and the mass production and sale of electric vehicles are started at home and abroad. The vehicle-mounted power battery system is used as a core component of the electric automobile, and the performance of the vehicle-mounted power battery system directly influences the performance and safety of the electric automobile. In order to ensure the safety and performance of the vehicle-mounted power battery system, the closed state information of the relay needs to be monitored in real time.

Disclosure of Invention

The embodiment of the application provides a system and a method for detecting the working state of a main negative relay.

The first aspect of the embodiment of the application provides a working state detection system of a main negative relay, which comprises a first loop and a level detection circuit, wherein the first loop comprises a first DC module, a main positive relay, a second DC module and a main negative relay which are sequentially connected, the level detection circuit comprises a first protection device, a detection device and a sampling circuit module, wherein,

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

the first protection device is used for preventing cause when main negative relay is closed main negative relay operating condition detecting system's circuit short circuit, the detection device is used for the partial pressure, the sampling circuit module is used for gathering the first level signal of the first end of detection device with the first drive signal of main negative relay, and according to first level signal first drive signal with mapping relation between the operating condition of main negative relay confirms first level signal with first drive signal corresponds the operating condition of main negative relay, operating condition includes normal condition and abnormal state, abnormal state includes unable closure and adhesion.

In one embodiment, the sampling circuit module comprises a micro-control processing module and a clipping circuit module, wherein,

the positive pole of the first DC module is connected with the first end of the main positive relay, the second end of the main positive relay is connected with the positive pole of the second DC module, the negative pole of the second DC module is connected with one end of the main negative relay, and the other end of the main negative relay is connected with the negative pole of the first DC module;

the first end of the first protection device is connected with 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 with the first end of the detection device, the first end of the amplitude limiting circuit module and the first end of the main negative relay, the second end of the detection device is connected with the negative electrode of the first DC module and the second end of the main negative relay, and the second end of the amplitude limiting circuit module is connected with the micro-control processing module;

the first DC module is used for providing voltage for a circuit of the working state detection system of the main negative relay, the main positive relay and the main negative relay are used for controlling the on-off of the circuit of the working state detection system of the main negative relay, the amplitude limiting circuit module is used for overvoltage protection and avoiding the damage of the micro-control processing module, the micro-control processing module is used for collecting a first level signal of a first end of the detection device and a first driving signal of the main negative relay and determining the working state of the main negative relay corresponding to the first level signal and the first driving signal according to the mapping relation among the first level signal, the first driving signal and the working state of the main negative relay.

In one embodiment, the clipping circuit block includes a second protection device, a first power supply, a first unidirectional conducting device, and a first resistor, wherein,

the first end of second protection device is connected the second end of first protection device the first end of detection device with the first end of main negative relay, the second end of second protection device is connected little control processing module with the first end of first resistance, the second end of first resistance is connected the positive pole of first one-way conduction device, the negative pole of first one-way conduction device is connected first power.

In one embodiment, the clipping circuit module includes a third protection device, a second unidirectional conducting device, a third unidirectional conducting device, a second power supply, a third power supply, a first switch, a second resistor, and a third resistor, wherein,

the first end of the third protection device is connected with the second end of the first protection device, the first end of the detection device and the first end of the main negative relay, the second end of the third protection device is connected with the micro-control processing module, the first end of the first switch and the first end of the second switch, the second end of the first switch is connected with the first end of the second resistor, the second end of the second resistor is connected with the cathode of the second unidirectional conducting device, the second switch is connected with the first end of the third resistor, the second end of the third resistor is connected with the anode of the third unidirectional conducting device, the anode of the second unidirectional conducting device is connected with the cathode of the second power supply, the cathode of the third unidirectional conducting device is connected with the anode of the third power supply, the anode of the second power supply and the cathode of the third power supply are connected to the second end of the detection device and the cathode of the first DC module.

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

the fourth power supply, the fourth unidirectional conducting device and the fourth resistor are sequentially connected in series and then connected with the second end of the first protection device, the first end of the fourth protection device and the first end of the detection device, wherein the anode of the fourth unidirectional conducting device is connected with the fourth power supply;

the fourth power supply is used for providing electric 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 bias voltage for the micro-control processing module.

In one embodiment, the system further comprises a signal detection module, wherein,

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

the signal detection module is used for detecting a first driving signal of the main negative relay and a second driving signal of the main positive relay and sending the first driving signal and the second driving signal to the micro-control processing module.

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

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

acquiring a first driving signal of the main and negative relays;

and determining the working state of the main and negative relay according to the first level signal, the first driving signal and a preset relation, wherein the preset relation refers to the corresponding relation among the first level signal, the first driving signal and the working state of the main and negative relay, the working state comprises a normal state and an abnormal state, and the abnormal state comprises the conditions of incapability of closing and sticking.

In one embodiment, after the sampling circuit module collects the first level signal of the first terminal of the detection device, the method further includes:

and determining the opening and closing states of the main and negative relays corresponding to the first level signal according to the mapping relation between the first level signal and the opening and closing states of the main and negative relays, wherein the opening and closing states comprise opening and closing.

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

and detecting a first driving signal of the main and negative relays and sending the first driving signal to the micro-control processing module.

In one embodiment, the determining the working state of the main and negative relays according to the first level signal, the first driving signal and a preset relationship, where the preset relationship refers to a corresponding relationship between the first level signal, the first driving signal and the working state of the main and negative relays, the working state includes a normal state and an abnormal state, and the abnormal state includes a state that cannot be closed and is stuck, includes:

when the first level signal is at a high level and the main and negative relays have a first driving signal, judging that the main and negative relays cannot be closed;

when the first level signal is at a high level and the main and negative relays do not have a first driving signal, judging that the main and negative relays are normally switched off;

when the first level signal is at a low level and the main and negative relays have a first driving signal, judging that the main and negative relays are normally closed;

and when the first level signal is at a low level and the main and negative relays do not have the first driving signal, judging that the main and negative relays are stuck.

In the application, the working state detection system of the main negative relay comprises a first loop and a level detection circuit, wherein the first loop comprises a first DC module, a main positive relay, a second DC module and a main negative relay which are sequentially connected, the level detection circuit comprises a first protection device, a detection device and a sampling circuit module, wherein the first end of the first protection device is connected with 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 with 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 with the negative electrode of the first DC module and the second end of the main negative relay; the first protection device is used for preventing a short circuit is caused when the main and negative relays are closed, the detection device is used for dividing voltage, the sampling circuit module is used for collecting a first level signal of a first end of the detection device and a first driving signal of the main and negative relays, and determining the working state of the main and negative relays corresponding to the first level signal according to the mapping relation among the first level signal, the first driving signal and the working state of the main and negative relays, and the working state comprises a normal state and an abnormal state. Therefore, the working state detection system of the main and negative relays determines the working state of the main and negative relays according to the first level signal of the first end of the detection device, the first driving signal of the main and negative relays and the mapping relation between the first level signal and the first driving signal and the working state of the main and negative relays, so that the detection system can report fault information in time and the fault judgment accuracy is improved.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings referred to in the embodiments or the background art of the present application will be briefly described below.

FIG. 1 is a schematic diagram of a system for detecting the working state of a main relay and a negative relay according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a second system for detecting the working state of a main relay and a negative relay provided in the embodiment of the present application;

FIG. 3 is a schematic diagram of a third system for detecting the working state of a main negative relay according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a fourth system for detecting an operating state of a main negative relay according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a fifth system for detecting an operating state of a main and negative relay according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a sixth system for detecting an operating state of a main and negative relay according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a seventh system for detecting an operating state of a main and negative relay according to an embodiment of the present disclosure;

fig. 8 is a schematic flowchart of a method for detecting an operating state of a main relay and a negative relay according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The following are detailed below.

The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

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

The vehicle-mounted power battery system is used as a core component of the electric automobile, and the performance of the vehicle-mounted power battery system directly influences the performance and safety of the electric automobile. In order to ensure the safety and performance of a vehicle-mounted power battery system and reduce the potential safety hazard of an automobile, when an automobile relay breaks down, the state and fault position information of the relay need to be judged in time, and the conventional relay detection equipment has low fault positioning efficiency and accuracy and cannot report fault information in time.

In order to solve the above problems, an embodiment of the present application provides a system and a method for detecting a working state of a main negative relay, where the system for detecting a working state of a main negative relay 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, which are sequentially connected, the level detection circuit includes a first protection device, a detection device and a sampling circuit module, where a first end of the first protection device is connected to a positive electrode of the first DC module and a first end of the main positive relay, a second end of the first protection device is connected to a first end of the detection device, the sampling circuit module and a first end of the main negative relay, and a second end of the detection device is connected to a negative electrode of the first DC module and a second end of the main negative relay; the first protection device is used for preventing cause when main negative relay is closed main negative relay operating condition detecting system's circuit short circuit, the detection device is used for the partial pressure, the sampling circuit module is used for gathering the first level signal of the first end of detection device with the first drive signal of main negative relay, and according to first level signal first drive signal with mapping relation between the operating condition of main negative relay confirms first level signal first drive signal corresponds the operating condition of main negative relay, operating condition includes normal condition and abnormal state, abnormal state includes unable closure and adhesion. Therefore, the working state detection system of the main and negative relays determines the working state of the main and negative relays according to the first level signal of the first end of the detection device, the first driving signal of the main and negative relays and the mapping relation between the first level signal and the first driving signal and the working state of the main and negative relays, so that the detection system can report fault information in time and the fault judgment accuracy is improved.

Embodiments of the present application will be described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic diagram of a main negative relay operating state detection system according to an embodiment of the present disclosure, the main negative relay operating state detection system includes a first loop and a level detection circuit 500, the first loop includes 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, the level detection circuit 500 includes 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 the 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 the negative electrode of the first DC module 100 and a second end of the main negative relay 400;

the first protection device 510 is used for preventing the main and negative relay 400 from being closed to cause a short circuit of the working state detection system of the main and negative relay, the detection device 520 is used for dividing voltage, the sampling circuit module 530 is used for collecting a first level signal at the first end of the detection device 520 and a first driving signal of the main and negative relay 400, and determining the working state of the main and negative relay 400 corresponding to the first level signal and the first driving signal according to the mapping relation between the first level signal, the first driving signal and the working state of the main and negative relay 400, wherein the working state comprises a normal state and an abnormal state, and the abnormal state comprises a state which cannot be closed and a state which cannot be stuck.

In a specific implementation, the first DC module 100 may include a power battery, a storage battery, a parking distance control system, an integrated motor control, and the like, and the second DC module 200 may include a vehicle-mounted charger, a vehicle controller, a fast charging interface, a heater, a DC-DC converter, and the like; the first protection device 510 may be a voltage dividing and current limiting device; the sensing device 520 is capable of voltage division, and the sensing device 520 may be a voltage divider or the like.

When the main and negative relays 400 are closed, the first level signal collected by the sampling circuit module 530 is at a low level, and when the main and negative relays 400 are opened, the first level signal collected by the sampling circuit module 530 is at a high level. The first level signal collected by the sampling circuit module 530 is a low level, and when the first driving signal does not exist, the main and negative relays 400 are in an abnormal state, i.e., a stuck state; the first level signal acquired by the sampling circuit module 530 is a low level, and when the first driving signal exists, the main and negative relays 400 are normal, that is, normally closed; the first level signal collected by the sampling circuit module 530 is a high level, and when the first driving signal does not exist, the main and negative relays 400 are normal, that is, normally turned off; the first level signal collected by the sampling circuit module 530 is at a high level, and when the first driving signal exists, the main and negative relays 400 are abnormal, that is, cannot be normally closed.

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, and determines the working state of the main and negative relays 400 according to the first level signal and the first driving signal of the main and negative relays 400, so as to detect the abnormal state of the main and negative relays 400 in time and improve the fault determination accuracy.

As a possible implementation, referring to fig. 2, the sampling circuit module 530 includes a micro-control processing module 532 and a clipping circuit module 531, wherein,

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

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

the first DC module 100 is configured to provide voltage for a circuit of the working state detection system of the main negative relay, the main positive relay 300 and the main negative relay 400 are configured to control on/off of the circuit, the amplitude limiting circuit module 531 is configured to protect against overvoltage, so as to prevent the micro-control processing module 532 from being damaged, and the micro-control processing module 532 is configured to collect a first level signal of a first end of the detection device 520 and a first driving signal of the main negative relay 400, and determine a working state of the main negative relay 400 corresponding to the first level signal and the first driving signal according to a mapping relationship among the first level signal, the first driving signal, and the working state of the main negative relay 400.

The Micro Control processing module 532 may be an MCU _ SMP, a Micro Control Unit (MCU) is a Micro Control Unit, and a CPU, an RAM, a ROM, a timing counter, and various I/O interfaces of a computer are integrated on one chip to form a chip-level computer, which is controlled in different combinations for different applications. SMP refers to the collection of a set of processors on one computer. The limiter circuit module 531 may be formed of only a limiter device, or may be formed of a limiter circuit.

The micro control processing module 532 may be connected to the first end of the detection device 520 through an I/O interface to acquire a first level signal, and determine the on/off state of the main and negative relay 400 according to a mapping relationship between the first level signal and the working state of the main and negative relay 400, for example, the first level signal is a high level, and the main and negative relay 400 is in an off state.

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

As a possible implementation manner, please refer to fig. 3, the limiter circuit module includes a second protection device 5311, a first power supply 5312, a first unidirectional conducting device 5313, and a first resistor 5314, wherein a first end of the second protection device 5311 is connected to a second end of the first protection device 510, a first end of the detection device 520, and a first end of the main negative relay 400, a second end of the second protection device 5311 is connected to the micro-control processing module 532 and a first end of the first resistor 5314, a second end of the first resistor 5314 is connected to a positive electrode of the first unidirectional conducting device 5313, and a negative electrode of the first unidirectional conducting device 5313 is connected to the first power supply 5312.

The amplitude limiting circuit module includes a second protection device 5311, a first one-way conduction device 5313, and a first power supply 5312, where the second protection device 5311 may be a current limiting resistor, and the first one-way conduction device 5313 may be a 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 serves as a pull-up resistor, so that the circuit is prevented from being damaged, and the safety of the circuit is ensured.

In this example, it can be seen that, the sampling chip in the micro-control processing module can be prevented from being damaged due to the fact that the first DC module 100 or the second DC module 200 is reversely connected due to the overhigh voltage through the amplitude limiting circuit module, and the circuit is simple.

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

a 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, a second end of the third protection 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, a second end of the first switch 5320 is connected to the first end of the second resistor 5322, a second end of the second resistor 5322 is connected to the negative electrode of the second one-way conduction device 5316, the second switch 5321 is connected to the first end of the third resistor 5323, a second end of the third resistor 5323 is connected to the positive electrode of the third one-way conduction device 5317, the positive electrode of the second one-way conduction device 5316 is connected to the negative electrode of the second power supply 5318, and the negative electrode of the third one-way conduction device 5317 is connected to the positive electrode of the third power supply 5319, the anode of the second power supply 5318 and the cathode of the third power supply 5319 are connected to the second terminal of the detection device 520 and the cathode of the first DC module 100.

The third protection device 5314 may be a current limiting resistor, the second unidirectional conducting device 5316 and the third unidirectional conducting device 5317 may be diodes, the second power supply 5318 and the third power supply 5319 may be direct current power supplies, and when neither the first DC module 100 nor the second DC module 200 can supply power, the second resistor 5322 and the third resistor 5323 may be pull-up resistors, which can ensure circuit safety and improve circuit stability, and the first switch 5320 and the second switch 5321 may switch power supplies, so as to obtain detection results under multiple power supplies, and improve accuracy of the detection system.

In this example, it can be seen that, the sampling chip in the micro-control processing module can be prevented from being damaged due to the fact that the first DC module 100 or the second DC module 200 is reversely connected due to the overhigh voltage through the amplitude limiting circuit module, and the circuit is simple.

As a possible implementation manner, please refer to fig. 5, fig. 5 is a schematic diagram of another system for detecting an operating state of a main relay and a negative relay provided in an embodiment of the present application, in which the limiter circuit module includes a fourth power supply 5327, a fourth one-way conducting device 5326, and a fourth resistor 5325, wherein,

the fourth power supply 5327, the fourth unidirectional conducting device 5326 and the fourth resistor 5325 are sequentially connected in series and then connected to the second end of the first protection device 510, 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 conducting device 5326 is connected to the fourth power supply 5327;

the fourth power supply 5327 is configured to provide power, the fourth unidirectional conducting device 5326 is configured to protect the fourth power supply, and the fourth resistor 5325 is configured to protect the micro-control processing module 532 and provide bias voltage for the micro-control processing module 532.

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

It can be seen that, in this example, the working state detection system of the main negative relay provides the power supply voltage for the detection system circuit by setting the fourth power supply 5327, and determines the working state of the main negative relay 400 and improves the fault determination accuracy by detecting the system circuit voltage.

As a possible implementation manner, please refer to fig. 6, fig. 6 is a schematic diagram of another system for detecting working states of a main relay and a negative relay provided in an embodiment of the present application, in which 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 unidirectional conducting device 5330, and a fifth power supply 5331, wherein,

a fifth power supply 5331 is connected to a first end of a fifth unidirectional conducting device 5330, a second end of the fifth unidirectional conducting device 5330 is connected to a first end of a fifth resistor 5329, a second end of the fifth resistor 5329 is connected to a fifth protection device 5328, the detection device 520 and a first end of a sixth resistor 5332, a second end of the fifth protection device 5328 is connected to the micro-control processing module 532, 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, and a second end of the sixth resistor 5332 is connected to a negative electrode of the second DC module 200 and a first end of the main negative relay 400.

The fifth resistor 5329 is used as a pull-up resistor, the sixth resistor 5332 is used as a protection resistor, and is configured to stabilize a circuit of the detection system for detecting the working state of the main negative relay when the main negative relay 400 is closed, the detection device 520 is used for voltage division, the micro-control processing module 532 is configured to collect a first level signal at a first end of the detection device 520 and a first driving signal of the main negative relay 400, and determine the working state of the main negative relay 400 corresponding to the first level signal and the first driving signal according to a mapping relationship among the first level signal, the first driving signal, and the working state of the main negative relay 400, where the working state includes a normal state and an abnormal state, and the abnormal state includes a state that the main negative relay cannot be closed and stuck.

As can be seen, in the present example, the working state detection system of the main negative relay can determine the working state of the main negative relay 400 and improve the fault determination accuracy by providing the fifth power supply 5331.

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

Wherein when a first driving signal of the main negative relay 400 and a 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 can be 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, the signals are detected by the signal detection module 540 and then sent to the micro-control processing module 532.

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

In this example, the signal detection module 540 may detect the first driving signal and the second driving signal under various conditions, so as to determine the working state of the main and negative relays 400 in combination with the first level signal, and improve the accuracy of the relay fault determination.

Referring to fig. 8, fig. 8 is a schematic flowchart of a method for detecting a working state of a main negative relay, which is applied to a system for detecting a working state of a main negative relay, and includes a first loop and a level detection circuit, where the first loop includes a first DC module, a main positive relay, a second DC module, and a main negative relay, which are sequentially connected, the level detection circuit includes a first protection device, a detection device, and a sampling circuit module, and the method includes:

s801, acquiring a first level signal of a first end of the detection device through the sampling circuit module;

s802, acquiring a first driving signal of the main and negative relays;

and S803, determining the working state of the main and negative relays according to the first level signal, the first driving signal and a preset relation, wherein the preset relation refers to a mapping relation among the first level signal, the first driving signal and the working state of the main and negative relays, the working state comprises a normal state and an abnormal state, and the abnormal state comprises the condition that the main and negative relays cannot be closed and stuck.

The first level signal is used as an inquiry identifier, and the mapping relation between the first level signal and the opening and closing states of the main and negative relays is inquired, wherein the mapping relation comprises the corresponding relation between the first level signal and the opening and closing states of the main and negative relays; and determining the opening and closing state of the main and negative relays according to the mapping relation, and judging whether the main and negative relays are in a normal working state or not according to the opening and closing state and the first driving signal of the main and negative relays.

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 judges the working state of the main and negative relays according to the first level signal and the first driving signal of the main and negative relays, so that the abnormal state of the main and negative relays can be detected in time, and the accuracy of determining the fault of the main and negative relays can be improved.

As a possible implementation manner, after the sampling circuit module collects the first level signal of the first terminal of the detection device, the method further includes: and determining the opening and closing states of the main and negative relays corresponding to the first level signal according to the mapping relation between the first level signal and the opening and closing states of the main and negative relays, wherein the opening and closing states comprise opening and closing.

When the first level signal is detected to be at a high level, the working state of the main and negative relays is judged to be off; and when the first level signal is detected to be at a low level, judging that the working state of the main and negative relays is closed.

In this example, it can be seen that, the sampling circuit module is used to collect a first level signal at the first end of the detection device, and according to a mapping relationship between the first level signal and the open-close state of the main and negative relays, the open-close state of the main and negative relays corresponding to the first level signal is obtained, so as to determine whether the working state of the main and negative relays is normal.

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

Therefore, the working state of the main and negative relays is judged according to the first level signal and the first driving signal of the main and negative relays, so that the abnormal state of the main and negative relays can be detected in time, fault information can be reported in time, and the accuracy of determining the faults of the main and negative relays is improved.

As a possible implementation manner, the determining, according to the first level signal, the first driving signal, and a preset relationship, the working state of the main and negative relays, where the preset relationship refers to a corresponding relationship between the first level signal, the first driving signal, and the working state of the main and negative relays, the working state includes a normal state and an abnormal state, and the abnormal state includes a state that cannot be closed and is stuck, includes: when the first level signal is at a high level and the main and negative relays have first driving signals, determining that the main and negative relays cannot be closed; when the first level signal is at a high level and the main and negative relays do not have a first driving signal, determining that the main and negative relays are normally switched off; when the first level signal is at a low level and the main and negative relays have a first driving signal, determining that the main and negative relays are normally closed; and when the first level signal is at a low level and the main and negative relays have no first driving signal, determining that the main and negative relays are stuck.

Wherein, the first level signal, the on-off 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

In this example, the detection system determines the working state of the main and negative relays according to the first level signal and the first driving signal, so as to improve the timeliness of detecting the abnormal state of the main and negative relays and the accuracy of determining the fault of the main and negative relays.

It should be noted that, for the sake of simplicity, the embodiments of the present application are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The foregoing has outlined rather broadly the principles and features of the present invention and the advantages thereof that the present general inventive concept, and the detailed description of the embodiments that follow, when read in conjunction with the accompanying drawings, in which like reference numerals refer to like elements throughout; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific implementation and application scope, and in view of the above, the content of the present specification should not be construed as a limitation to the present application.