Insulation detection circuit, detection method, equipment and storage medium
By calculating the difference between the positive and negative currents of the component under test and combining it with the grounding capacitor voltage to determine the status, the problem of low insulation testing efficiency in new energy vehicles is solved, and insulation testing of faulty components can be quickly and accurately located.
Patent Information
- Application Number
- CN202511522610.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-23
- Publication Date
- 2025-12-12
AI Technical Summary
Existing insulation testing methods for new energy vehicles have low testing efficiency and cannot accurately locate fault points, requiring on-site inspection of each high-voltage component.
By acquiring the positive and negative DC currents of the component under test, calculating the current difference, determining the insulation information based on the leakage current, and combining the voltage of the grounding capacitor to judge the status of the component under test, real-time insulation detection is achieved.
It improves the efficiency and accuracy of insulation testing, enables precise location of faulty components, and reduces the workload of on-site inspection.
Smart Images
Figure CN121114701A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of insulation detection, in particular to an insulation detection circuit, a detection method, equipment and a storage medium. BACKGROUND
[0002] The existing insulation detection method of new energy vehicles mainly indirectly measures and calculates insulation resistance through a BMS (Battery Management System), mainly using an unbalanced bridge method and a low-frequency signal injection method to calculate real-time insulation resistance value, and then determining whether the calculated resistance value meets the condition by setting a standard. However, the measurement object of the BMS is usually the high-voltage loop of the vehicle as a whole, which cannot accurately locate the fault point, and when a fault occurs, it is often necessary to use an insulation meter and other equipment to check each high-voltage component one by one on site, so the detection efficiency is low. SUMMARY
[0003] Therefore, the purpose of the present application is to provide an insulation detection circuit, a detection method, equipment and a storage medium to solve the problem of low detection efficiency of the existing insulation detection method.
[0004] In order to achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows: In a first aspect, the embodiments of the present application provide an insulation detection circuit, comprising: an insulation detection device, a current sensor and a to-be-detected component, the negative pole of the direct current side of the to-be-detected component is connected to one end of the insulation detection device through the current sensor, and the positive pole of the direct current side of the to-be-detected component is connected to the other end of the insulation detection device through the current sensor; the insulation detection device is configured to acquire the positive pole current and the negative pole current of the direct current side of the to-be-detected component; calculate the current difference value of the positive pole current and the negative pole current; calculate the leakage current of the to-be-detected component according to the current difference value and a standard value, and determine the insulation information of the to-be-detected component according to the leakage current.
[0005] In an optional embodiment, the number of to-be-detected components is multiple, the negative pole of the direct current side of each to-be-detected component is connected to one end of the insulation detection device through the current sensor, and the positive pole of the direct current side of each to-be-detected component is connected to the other end of the insulation detection device through the current sensor.
[0006] In an optional embodiment, each to-be-detected component is configured with a corresponding grounding capacitor, and each to-be-detected component is grounded through the corresponding grounding capacitor.
[0007] In a second aspect, embodiments of the present invention provide an insulation detection method, applied to the insulation detection circuit described in the first aspect, the method comprising: Obtain the positive and negative currents on the DC side of the component under test; Calculate the current difference between the positive current and the negative current; The leakage current of the component under test is calculated based on the current difference and the standard value, and the insulation information of the component under test is determined based on the leakage current.
[0008] In an optional implementation, the method further includes: Each component to be tested is assigned a corresponding identification identifier; The insulation information of each component under test is determined based on its identification identifier and leakage current.
[0009] In an optional implementation, the method further includes: Obtain the voltage value of each grounding capacitor connected to the component under test, and determine whether the component under test corresponding to the grounding capacitor is in a charging or discharging state based on the voltage value.
[0010] In an optional implementation, the step of determining whether the component under test corresponding to the grounding capacitor is in a charging or discharging state based on the voltage value includes: If the voltage value of the grounding capacitor is greater than or equal to the first preset voltage value, then the component under test corresponding to the grounding capacitor is determined to be in a charging state. If the voltage value of the grounding capacitor is less than or equal to the second preset voltage value, then the component under test corresponding to the grounding capacitor is determined to be in a discharge state, and the first preset voltage value is greater than the second preset voltage value.
[0011] Thirdly, embodiments of the present invention provide an electronic device, including a processor and a memory, wherein the memory stores machine-executable instructions that can be executed by the processor, and the processor can execute the machine-executable instructions to implement the insulation detection method described in the second aspect.
[0012] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the insulation detection method described in the second aspect.
[0013] The present invention provides an insulation detection circuit, detection method, device and storage medium, which acquires the positive and negative currents on the DC side of the component under test, calculates whether there is leakage current in the component under test based on the positive and negative currents, and obtains insulation information based on the leakage current, thereby realizing real-time inspection of insulation information and improving insulation detection efficiency.
[0014] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 A block diagram of an electronic device provided by an embodiment of the present invention is shown; Figure 2 This diagram illustrates the structure of an insulation detection circuit according to an embodiment of the present invention. Figure 3 This diagram illustrates another insulation detection circuit provided in an embodiment of the present invention. Figure 4 The diagram shows a flow chart of an insulation testing method provided by an embodiment of the present invention.
[0017] icon: 100 - Electronic equipment; 110 - Memory; 120 - Processor; 130 - Communication module; 200 - Insulation testing equipment; 300 - Component under test; 400 - Negative current sensor; 410 - Positive current sensor. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0020] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0021] Please refer to Figure 1 This is a block diagram of an electronic device 100. The electronic device 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, processor 120, and communication module 130 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines.
[0022] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.
[0023] The processor 120 is used to read / write data or programs stored in the memory 110 and to perform corresponding functions.
[0024] The communication module 130 is used to establish a communication connection between the electronic device 100 and other communication terminals through the network, and to send and receive data through the network.
[0025] It should be understood that, Figure 1 The structure shown is only a schematic diagram of the electronic device 100. The electronic device 100 may also include components that are larger than... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown. Figure 1 The components shown can be implemented using hardware, software, or a combination thereof.
[0026] Please refer to Figure 2 , Figure 2 This is a schematic diagram of an insulation detection circuit provided in this embodiment. The insulation detection circuit includes: The device includes an insulation testing device 200, a current sensor, and a component under test 300. The negative terminal of the DC side of the component under test 300 is connected to one end of the insulation testing device 200 through a negative current sensor 400, and the positive terminal of the DC side of the component under test 300 is connected to the other end of the insulation testing device 200 through a positive current sensor 410. The insulation testing device 200 may be a battery management system.
[0027] The insulation testing device 200 is used to acquire the positive and negative currents on the DC side of the component under test 300. Calculate the current difference between the positive current and the negative current; The leakage current of the component under test 300 is calculated based on the current difference and the standard value, and the insulation information of the component under test 300 is determined based on the leakage current.
[0028] Based on the vehicle's insulation requirements, the leakage current for a 250-500V high-voltage platform should be less than 0.5mA, and for a 500-1000V high-voltage platform, it should be less than 1mA. Therefore, the battery management system can be configured with a current sensor of corresponding accuracy, which should be in the 0.1mA range.
[0029] This embodiment obtains the positive and negative currents on the DC side of the component under test, then calculates whether there is leakage current in the component under test based on the positive and negative currents, and uses the leakage current to obtain insulation information, which can realize real-time inspection of insulation information and improve insulation detection efficiency.
[0030] In one embodiment, there are multiple components to be tested. The negative terminal of the DC side of each component to be tested is connected to one end of the insulation testing device through a negative current sensor 400, and the positive terminal of the DC side of each component to be tested is connected to the other end of the insulation testing device through a positive current sensor 410.
[0031] In one embodiment, each component under test is equipped with a corresponding grounding capacitor, and each component under test is grounded through the corresponding grounding capacitor.
[0032] like Figure 2 As shown, one end of the component under test (DUT) is grounded through a grounding capacitor. The grounding capacitor primarily utilizes the characteristics of capacitance to achieve functions such as filtering, decoupling, and surge suppression. Furthermore, during the charging or discharging process of the DUT, the voltage of the grounding capacitor will change accordingly. The insulation testing equipment uses the magnitude of the voltage of each grounding capacitor, or the voltage change, to determine whether the DUT connected to the grounding capacitor is in a charging or discharging state. Alternatively, the voltage of the grounding capacitor can be compared with the voltage of the DUT, or the DUT can send its current status to the insulation testing equipment via the CAN bus.
[0033] If the component under test is in a charging or discharging state, insulation testing will not be performed on the component under test to avoid detection deviation. Insulation testing will be performed on the component under test when it is in a normal working state.
[0034] This embodiment detects the voltage of the grounding capacitor connected to each component under test, determines the state of the component under test based on the voltage detection results, and does not perform insulation testing on the component under test when it is in a charging or discharging state, thereby avoiding the influence of the charging and discharging of the component under test on the insulation test results and improving the accuracy of insulation testing.
[0035] Please refer to Figure 3 , Figure 3 This is a schematic diagram of another insulation detection circuit provided in this embodiment.
[0036] Each component under test is considered as an insulation testing unit, and the calculated leakage current of component 1 under test is set as follows: Then the calculated leakage current of the nth component under test is: The leakage current of each component under test can be calculated separately using insulation testing equipment, and an alarm message can be issued when the leakage current is abnormal, so that users can quickly locate the faulty component under test.
[0037] This embodiment connects multiple components to the insulation testing equipment, enabling the equipment to perform insulation testing on multiple components simultaneously and accurately locate the equipment with insulation faults, thus improving the efficiency of insulation testing.
[0038] To perform the corresponding steps in the above embodiments and various possible methods, an implementation of the insulation detection method is given below. Please refer to [link / reference]. Figure 4 , Figure 4 This is a flowchart illustrating an insulation testing method provided in an embodiment of the present invention. It should be noted that the basic principle and technical effects of the insulation testing method provided in this embodiment are the same as those in the above embodiments. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the above embodiments. The insulation testing method includes: S401. Obtain the positive and negative currents on the DC side of the component under test.
[0039] S402. Calculate the current difference between the positive current and the negative current.
[0040] S403. Calculate the leakage current of the component under test based on the current difference and the standard value, and determine the insulation information of the component under test based on the leakage current.
[0041] In one embodiment, the method further includes: Each component to be tested is assigned a corresponding identification identifier; The insulation information of each component under test is determined based on its identification identifier and leakage current.
[0042] In one embodiment, the method further includes: Obtain the voltage value of each grounding capacitor connected to the component under test, and determine whether the component under test corresponding to the grounding capacitor is in a charging or discharging state based on the voltage value.
[0043] In an optional implementation, the step of determining whether the component under test corresponding to the grounding capacitor is in a charging or discharging state based on the voltage value includes: If the voltage value of the grounding capacitor is greater than or equal to the first preset voltage value, then the component under test corresponding to the grounding capacitor is determined to be in a charging state. If the voltage value of the grounding capacitor is less than or equal to the second preset voltage value, then the component under test corresponding to the grounding capacitor is determined to be in a discharge state, and the first preset voltage value is greater than the second preset voltage value.
[0044] Optionally, the above method can be stored in Figure 1The memory shown is either in or embedded in Figure 1 The operating system (OS) of the electronic device shown can be... Figure 1 The processor executes the commands. Meanwhile, the data and program code required to execute these modules can be stored in memory.
[0045] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.
[0046] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.
[0047] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. An insulation detection circuit, characterized in that, include: The insulation testing equipment, the current sensor, and the component under test are provided. The negative terminal of the DC side of the component under test is connected to one end of the insulation testing equipment through the current sensor, and the positive terminal of the DC side of the component under test is connected to the other end of the insulation testing equipment through the current sensor. The insulation testing device is used to acquire the positive and negative currents on the DC side of the component under test; Calculate the current difference between the positive current and the negative current; The leakage current of the component under test is calculated based on the current difference and the standard value, and the insulation information of the component under test is determined based on the leakage current.
2. The insulation detection circuit according to claim 1, characterized in that, The number of components to be tested is multiple. The negative terminal of the DC side of each component to be tested is connected to one end of the insulation testing device through the current sensor, and the positive terminal of the DC side of each component to be tested is connected to the other end of the insulation testing device through the current sensor.
3. The insulation detection circuit according to claim 1, characterized in that, Each component under test is equipped with a corresponding grounding capacitor, and each component under test is grounded through the corresponding grounding capacitor.
4. An insulation testing method, characterized in that, The method, applied to the insulation detection circuit as described in any one of claims 1-3, comprises: Obtain the positive and negative currents on the DC side of the component under test; Calculate the current difference between the positive current and the negative current; The leakage current of the component under test is calculated based on the current difference and the standard value, and the insulation information of the component under test is determined based on the leakage current.
5. The insulation testing method according to claim 4, characterized in that, The method further includes: Each component to be tested is assigned a corresponding identification identifier; The insulation information of each component under test is determined based on its identification identifier and leakage current.
6. The insulation testing method according to claim 4, characterized in that, The method further includes: Obtain the voltage value of each grounding capacitor connected to the component under test, and determine whether the component under test corresponding to the grounding capacitor is in a charging or discharging state based on the voltage value.
7. The insulation testing method according to claim 6, characterized in that, The step of determining whether the component under test corresponding to the grounding capacitor is in a charging or discharging state based on the voltage value includes: If the voltage value of the grounding capacitor is greater than or equal to the first preset voltage value, then the component under test corresponding to the grounding capacitor is determined to be in a charging state. If the voltage value of the grounding capacitor is less than or equal to the second preset voltage value, then the component under test corresponding to the grounding capacitor is determined to be in a discharge state, and the first preset voltage value is greater than the second preset voltage value.
8. An electronic device, characterized in that, It includes a processor and a memory, the memory storing machine-executable instructions that can be executed by the processor to implement the insulation detection method according to any one of claims 4-7.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the insulation detection method as described in any one of claims 4-7.