Load overcurrent protection method and system and computer readable storage medium
By calculating the accumulated damage of overcurrent current in the load loop, the misjudgment and misjudgment of complex overcurrent scenarios in the prior art are solved, and more accurate overcurrent protection is achieved.
Patent Information
- Application Number
- CN202310961109.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-31
- Publication Date
- 2025-02-14
AI Technical Summary
When the prior art overcurrent protection of loads in the circuit, it is difficult to effectively deal with complex overcurrent scenarios, resulting in misjudgment and misjudgment, affecting the safety of electronic devices.
By obtaining the ratio of the accumulated time of overcurrent current in the load loop and the overcurrent failure time, the accumulated damage is calculated. When the accumulated damage reaches the preset threshold, the loop where the load is located is controlled.
It realizes a more accurate judgment on overcurrent damage failure of the load, avoids misjudgment and misjudgment, and ensures the safety of electronic devices.
Smart Images
Figure CN119448130A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of overcurrent protection, and specifically provides a load overcurrent protection method, system and computer-readable storage medium. Background Art
[0002] There is usually an overcurrent risk in the circuit, which affects the safety of various electronic devices in the circuit. For example, in the high-voltage circuit of a battery pack equipped with a relay, an overcurrent may occur, thus affecting the safety of the relay.
[0003] In the related art, for overcurrent situations, an overcurrent protection strategy for each electronic device in the circuit is usually implemented based on a single overcurrent threshold and cumulative time threshold. Specifically, it is determined whether the current loop current exceeds the overcurrent threshold and whether the duration of the overcurrent exceeds the cumulative time threshold. If so, it is determined that there is an overcurrent risk, and then the circuit is cut off. However, different overcurrent levels and durations of overcurrent cause different damage to electronic devices in the circuit. A single overcurrent threshold and cumulative time threshold are difficult to cover complex overcurrent scenarios, and it is easy to make incorrect judgments about overcurrent damage failure states. For example, in some overcurrent scenarios, a single overcurrent threshold is set relatively large, which is prone to missed judgments. In other scenarios, a single overcurrent threshold is set relatively small, which is easy to be judged as an overcurrent damage failure risk in a relatively safe situation that will not damage the electronic devices, and the circuit is cut off, resulting in misjudgment. Summary of the invention
[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that when performing overcurrent protection on loads in a circuit, accurate and effective overcurrent protection cannot be provided for complex overcurrent scenarios.
[0005] In a first aspect, the present invention provides a load overcurrent protection method, comprising:
[0006] When the current of the circuit where the load is located is greater than the rated current, obtaining the accumulated duration of at least one overcurrent;
[0007] Determining cumulative damage based on the accumulated duration of the at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in the at least one overcurrent;
[0008] When the accumulated damage is equal to a preset threshold, the circuit where the load is located is controlled to be cut off.
[0009] In some embodiments, obtaining the accumulated duration of at least one overcurrent includes:
[0010] The accumulated durations of a plurality of overcurrents are obtained, wherein the plurality of overcurrents are arranged at equal intervals or the difference between any two adjacent overcurrents among the plurality of overcurrents increases with the increase of the overcurrent.
[0011] In some embodiments, obtaining the accumulated duration of at least one overcurrent includes: Determining the accumulated duration of the current overcurrent based on the duration between the current overcurrent and the rated current; the current overcurrent being the smallest overcurrent among the at least one overcurrent; and / or,
[0012] The accumulated duration of the current overcurrent is determined based on the duration between the current overcurrent and a smaller overcurrent adjacent to the current overcurrent; the current overcurrent is greater than the smallest overcurrent of the at least one overcurrent.
[0013] In some embodiments, the method further includes acquiring at least one pre-set overcurrent, wherein at least part of the at least one overcurrent has a certain margin relative to an actually achievable overcurrent of the loop.
[0014] In some embodiments, the ratio of the accumulated duration of each overcurrent in the at least one overcurrent to the corresponding overcurrent failure duration is obtained, and the ratios corresponding to the at least one overcurrent are summed to obtain the accumulated damage.
[0015] In a second aspect, the present invention provides a load overcurrent protection system, which includes a circuit unit and a battery management unit;
[0016] The loop unit includes a power supply, a current sensor, an active fuse and a load arranged in series;
[0017] The battery management unit is used to obtain the current collected by the current sensor; when the current is greater than the rated current, obtain the accumulated duration of at least one overcurrent; determine the accumulated damage based on the accumulated duration of the at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in the at least one overcurrent; when the accumulated damage is equal to a preset threshold, control the active fuse to cut off the circuit where the load is located.
[0018] In some embodiments, the load comprises a relay.
[0019] In some embodiments, obtaining the accumulated duration of at least one overcurrent includes:
[0020] The accumulated durations of a plurality of overcurrents are obtained, wherein the plurality of overcurrents are arranged at equal intervals or the difference between any two adjacent overcurrents among the plurality of overcurrents increases with the increase of the overcurrent.
[0021] In some embodiments, obtaining the accumulated duration of at least one overcurrent includes:
[0022] Determining the accumulated duration of the current overcurrent based on the duration between the current overcurrent and the rated current; the current overcurrent being the smallest overcurrent among the at least one overcurrent;
[0023] and / or,
[0024] The accumulated duration of the current overcurrent is determined based on the duration between the current overcurrent and a smaller overcurrent adjacent to the current overcurrent; the current overcurrent is greater than the smallest overcurrent of the at least one overcurrent.
[0025] In some embodiments, the battery management unit is further used to obtain the at least one pre-set overcurrent, wherein at least part of the at least one overcurrent has a certain margin relative to an actually achievable overcurrent of the loop.
[0026] In some embodiments, the ratio of the accumulated duration of each overcurrent in the at least one overcurrent to the corresponding overcurrent failure duration is obtained, and the ratios corresponding to the at least one overcurrent are summed to obtain the accumulated damage.
[0027] In a third aspect, the present invention provides a computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the load overcurrent protection method described in any one of the above is implemented.
[0028] In the case of adopting the above technical solution, the present invention can obtain the cumulative duration of at least one overcurrent when the current of the circuit where the load is located is greater than the rated current; generalize and apply the Miner cumulative damage theory to load damage judgment, and determine the cumulative damage based on the cumulative duration of at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in at least one overcurrent; when the cumulative damage is equal to the preset threshold, control the disconnection of the circuit where the load is located. This method can distinguish and examine the degree of damage and cumulative duration of different overcurrent intervals, so as to achieve more accurate overcurrent damage failure judgment for the load, achieve more accurate and effective overcurrent protection for the load, avoid misjudgment, and reduce the probability of load failure caused by missed overcurrent damage. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:
[0030] Figure 1 It is a schematic flow chart of main steps of a load overcurrent protection method provided by an embodiment of the present invention;
[0031] Figure 2 It is a load pulse overcurrent current diagram provided by the present invention;
[0032] Figure 3 is a flow chart of a load overcurrent protection method provided by an optional embodiment of the present invention;
[0033] Figure 4 It is a schematic diagram of the structure of a load overcurrent protection system provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0034] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.
[0035] See also Figure 1 As shown, Figure 1 1 is a flow chart of main steps of a load overcurrent protection method provided by an embodiment of the present invention, which may include:
[0036] Step S11: when the current of the circuit where the load is located is greater than the rated current, obtaining the accumulated duration of at least one overcurrent;
[0037] Step S12: determining the accumulated damage based on the accumulated duration of at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in the at least one overcurrent;
[0038] Step S13: When the accumulated damage is equal to the preset threshold, the circuit where the load is located is cut off.
[0039] In an embodiment of the present invention, the rated current may be the maximum allowable current that the load can maintain in a safe state. The rated current corresponding to the load may be pre-stored. When the current in the loop is less than or equal to the rated current, the load can continue to work effectively and will not be damaged.
[0040] In some embodiments, step S11 may specifically be real-time acquisition of the accumulated duration of the overcurrent. This method is conducive to more effectively and accurately determining the accumulated damage, thereby being able to more timely determine the damage and accurately perform overcurrent protection on the load.
[0041] In some embodiments, step S11 may specifically be to obtain the accumulated duration of multiple overcurrents, wherein the multiple overcurrents are arranged at equal intervals or the difference between any two adjacent overcurrents in the multiple overcurrents increases with the increase of the overcurrent.
[0042] In some embodiments, it can be set that the difference between two adjacent overcurrents increases with the increase of overcurrent, and the difference between any two adjacent overcurrents is greater than the difference between the smallest overcurrent among multiple overcurrents and the rated current. This method can reduce the amount of collected data and save computing resources by obtaining the cumulative duration of different overcurrents based on a certain current interval. In addition, considering that the probability of an overcurrent state with a smaller overcurrent is greater than the probability of an overcurrent state with a larger overcurrent, by setting the difference between two adjacent overcurrents to increase with the increase of overcurrent, and the difference between any two adjacent overcurrents is greater than the difference between the smallest overcurrent among multiple overcurrents and the rated current, the cumulative duration of different overcurrents can be obtained at a relatively small current interval when the overcurrent is small, and the cumulative duration of different overcurrents can be obtained at a relatively large current interval when the overcurrent is large, so that relatively more overcurrent and cumulative duration data can be obtained in the small overcurrent stage, and while saving computing resources, the cumulative damage can be determined more effectively and accurately, and overcurrent protection can be effectively performed. As an example, see Figure 2 As shown, Figure 2 The load pulse overcurrent diagram provided by the present invention, wherein the rated current can be expressed as I _limit It means that the overcurrent can be I3, I2 and I1, where I3<I2<I1, and I1-I2>I2-I3>I3-I _limit .
[0043] In some embodiments, obtaining the cumulative duration of at least one overcurrent in step S11 may include: determining the cumulative duration of the current overcurrent based on the duration between the current overcurrent and the rated current; the current overcurrent is the smallest overcurrent among at least one overcurrent; and / or determining the cumulative duration of the current overcurrent based on the duration between the current overcurrent and a smaller overcurrent adjacent to the current overcurrent; the current overcurrent is greater than the smallest overcurrent among at least one overcurrent.
[0044] When there is only one overcurrent, step S11 can be specifically to determine the cumulative duration of the current overcurrent based on the duration between the current overcurrent and the rated current. By upwardly equating the duration between the rated current and the current overcurrent to the cumulative duration of the current overcurrent, a certain safety margin is provided, which can ensure that the control cut-off circuit is carried out before the load is damaged and fails, and effective overcurrent protection is performed. Figure 2 For example, when there is only overcurrent I1, the accumulated time can be t 31+t 21 +t1+t 22 +t 32 , where t 31 and t 32 is the cumulative duration of I3, t 21 and t 22 is the accumulated time of I2, and t1 is the accumulated time of I1. In addition, this method performs load overcurrent protection by combining overcurrent with accumulated time, which can effectively avoid misjudgment.
[0045] When there are multiple overcurrents, step S11 can be specifically: when the current overcurrent is the smallest overcurrent among the multiple overcurrents, the cumulative duration of the current overcurrent is determined based on the duration between the current overcurrent and the rated current; when the current overcurrent is greater than the smallest overcurrent among the multiple overcurrents, the cumulative duration of the current overcurrent is determined based on the duration between the current overcurrent and the smaller overcurrent adjacent to the current overcurrent. By taking the duration between the adjacent smaller overcurrent and the current overcurrent as the cumulative duration of the current overcurrent, a certain safety margin is provided, which can ensure that the control cut-off circuit is carried out before the load is damaged and fails, and effective overcurrent protection is performed. Figure 2 For example, the cumulative duration corresponding to I3 can be t 31 +t 32 , the cumulative duration corresponding to I2 can be t 21 +t 22 , the accumulated time corresponding to I1 can be t1. In addition, the method can effectively avoid misjudgment by combining the overcurrent current with the accumulated time, and can also avoid missed judgment by setting multiple overcurrent currents.
[0046] In some embodiments, step S12 may specifically include: obtaining a ratio of a cumulative duration of each overcurrent in at least one overcurrent to a corresponding overcurrent failure duration, and summing the ratios corresponding to at least one overcurrent to obtain cumulative damage.
[0047] When the accumulated duration of an overcurrent is obtained, the accumulated damage is determined according to the ratio of the accumulated duration to the overcurrent failure duration corresponding to the overcurrent;
[0048] When the accumulated durations of multiple overcurrents are obtained, the ratio of the accumulated duration of each overcurrent in the multiple overcurrents to the corresponding overcurrent failure duration is obtained, and the ratios corresponding to the multiple overcurrents are summed to obtain the accumulated damage.
[0049] In the embodiment of the present invention, the Miner cumulative damage theory is extended and applied to load damage judgment, and the cumulative damage can be calculated by the following expression:
[0050] Where i can be a positive integer greater than or equal to 1, D i represents the cumulative damage corresponding to i overcurrents, t i Represents the cumulative duration corresponding to the i-th overcurrent, T i Represents the overcurrent failure duration corresponding to the i-th overcurrent current. This method can distinguish the damage degree and cumulative duration of different overcurrent intervals, which is conducive to more accurate overcurrent damage failure judgment of the load and more accurate and effective overcurrent protection of the load.
[0051] by Figure 2 For example, the accumulated durations corresponding to the three overcurrents I1, I2, and I3 are t1, t2 = t 21 +t 22 t3=t 31 +t 32 The corresponding over-current failure durations are T1, T2, and T3, respectively, and the cumulative damage
[0052] In the embodiment of the present invention, the overcurrent failure duration may also be obtained in advance by the following steps:
[0053] When the current flowing through the load is greater than the rated current, the working duration of the load from the effective state to the complete failure state in the test circuit under at least one overcurrent current is obtained, and the working duration is determined as the overcurrent failure duration of the corresponding overcurrent current.
[0054] In some embodiments, for the overcurrent that may occur in the circuit where the load is located, the duration of the load's operation from the effective state to the complete failure state in the test circuit under each constant overcurrent can be obtained respectively.
[0055] In some embodiments, the test loop may include a test power supply, a test current sensor, and a test load having the same model as the load, and the test power supply, the test current sensor, and the test load are connected in series.
[0056] In some embodiments, the load overcurrent protection method provided by the present invention can be applied to overcurrent protection of relays, and accordingly, the overcurrent failure duration of the relay under at least one overcurrent current can be obtained in advance, wherein, whether the relay is in an effective state can be determined by judging whether it can be opened or closed normally. If it cannot be opened or closed normally, and the relay contacts are blown or stuck, it can be determined that the relay is in a failure state.
[0057] In some embodiments, the preset threshold in step S13 may be 1. i=1, the circuit where the load is located is controlled to be cut off. In other embodiments, a preset threshold value may also be set according to actual needs. For example, the preset threshold value may be a value less than 1.
[0058] In the embodiment of the present invention, whether there is an overcurrent damage failure risk can be determined by judging whether the accumulated damage reaches a preset threshold.
[0059] In some embodiments, an active fuse may also be provided in the circuit where the load is located, and step S13 may specifically control the active fuse to cut off the circuit where the load is located when the cumulative damage is equal to a preset threshold. Among them, an active fuse such as a pyrofuse may be detonated in response to an instruction that the cumulative damage is equal to a preset threshold, i.e., it is determined to have an overcurrent damage failure risk, to cut off the circuit. The active fuse can actively cut off the circuit in response to an instruction determined to have an overcurrent damage failure risk. Compared with traditional thermal fuses, it can be applied to a variety of situations with overcurrent damage failure risks, can be cut off quickly, and achieve precise protection.
[0060] The above is a load overcurrent protection method provided by an embodiment of the present invention. When the current in the circuit where the load is located is greater than the rated current, the cumulative duration of at least one overcurrent is obtained; the Miner cumulative damage theory is extended and applied to load damage judgment, and the cumulative damage is determined based on the cumulative duration of at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in at least one overcurrent; when the cumulative damage is equal to the preset threshold, the circuit where the load is located is controlled to be cut off. This method can distinguish between the degree of damage and the cumulative duration in different overcurrent intervals, so as to achieve more accurate overcurrent damage failure judgment for the load, achieve more accurate and effective overcurrent protection for the load, avoid misjudgment, and reduce the probability of load failure due to missed overcurrent damage.
[0061] In some embodiments, at least one overcurrent current whose cumulative duration needs to be obtained can be pre-set, and at least one overcurrent current can be used as a detection point to determine whether the load has a risk of overcurrent damage failure and perform overcurrent protection based on the judgment result. For details, please refer to the description of the following embodiments.
[0062] See also Figure 3 As shown, Figure 3 : is a flow chart of a load overcurrent protection method provided by an optional embodiment of the present invention, which may include:
[0063] Step S31: obtaining at least one preset overcurrent, wherein at least part of the at least one overcurrent has a certain margin relative to an actual achievable overcurrent of the loop;
[0064] Step S32: when the current of the circuit where the load is located is greater than the rated current, obtaining the accumulated duration of at least one preset overcurrent;
[0065] Step S33: determining the accumulated damage based on the accumulated duration of at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in the at least one overcurrent;
[0066] Step S34: When the accumulated damage is equal to the preset threshold, the circuit where the load is located is controlled to be cut off.
[0067] Among them, steps S33 and S34 can be implemented in the same manner as steps S12 and S13, and will not be described here for the sake of brevity. For details, please refer to the description above.
[0068] In some embodiments, step S31 may specifically include:
[0069] Get a preset overcurrent, which is greater than the actual current of the load in the loop. Figure 2 For example, the preset overcurrent may be I1, which is greater than the actual current of the load in the loop, that is, I1 is an overcurrent that cannot actually be reached when an overcurrent occurs in the loop.
[0070] In some other embodiments, step S31 may specifically include: obtaining a plurality of preset overcurrents, which may be equal to or at least partially greater than the actual current of the load in the loop. Figure 2 For example, the pre-set overcurrents may be I1, I2, and I3, I1 is greater than the actual current of the load in the loop, that is, I1 is the overcurrent that cannot be actually reached when the load has an overcurrent in the loop, I2 and I3 are equal to the actual current of the load in the loop, that is, I2 and I3 are the overcurrent that can actually be reached when the load has an overcurrent in the loop. By setting at least part of the overcurrent to be greater than the actual current of the load in the loop, a certain current safety margin can be provided, which can ensure that the loop is controlled and cut off before the load is damaged and fails, and effective overcurrent protection can be performed.
[0071] In some embodiments, the pre-set multiple overcurrents may be multiple overcurrents set at equal intervals; in other embodiments, the difference between two adjacent overcurrents in the pre-set multiple overcurrents increases with the increase of the overcurrent, and the difference between any two adjacent overcurrents is greater than the difference between the minimum overcurrent and the rated current among the multiple overcurrents.
[0072] The method can reduce the amount of collected data and save computing resources by obtaining the accumulated duration of different overcurrents at intervals. In addition, considering that the probability of an overcurrent state with a smaller overcurrent is greater than the probability of an overcurrent state with a larger overcurrent, by setting the difference between two adjacent overcurrents to increase as the overcurrent increases, and the difference between any two adjacent overcurrents is greater than the difference between the minimum overcurrent and the rated current among multiple overcurrents, the accumulated duration of different overcurrents can be obtained at a relatively small current interval when the overcurrent is small, and the accumulated duration of different overcurrents can be obtained at a relatively large current interval when the overcurrent is large, so that relatively more overcurrent and accumulated duration data can be obtained in the stage of smaller overcurrent, and the accumulated damage can be determined more effectively and accurately while saving computing resources, and overcurrent protection can be effectively performed.
[0073] In some embodiments, obtaining the cumulative duration of at least one pre-set overcurrent in step S32 may include: determining the cumulative duration of the current overcurrent based on the duration between the current overcurrent and the rated current; the current overcurrent is the smallest overcurrent among at least one overcurrent; and / or determining the cumulative duration of the current overcurrent based on the duration between the current overcurrent and a smaller overcurrent adjacent to the current overcurrent; the current overcurrent is greater than the smallest overcurrent among at least one overcurrent.
[0074] In some embodiments, when an overcurrent is preset, step S32 may be specifically to determine the cumulative duration of the current overcurrent based on the duration between the current overcurrent and the rated current. By upwardly equating the duration between the rated current and the current overcurrent to the cumulative duration of the current overcurrent, a certain safety margin is provided, which can ensure that the control cut-off circuit is carried out before the load is damaged and fails, and effective overcurrent protection is performed.
[0075] In some embodiments, when multiple overcurrents are preset, step S32 can be specifically to determine the cumulative duration of the current overcurrent based on the duration between the current overcurrent and the rated current when the current overcurrent is the smallest overcurrent among the multiple overcurrents; and to determine the cumulative duration of the current overcurrent based on the duration between the current overcurrent and the smaller overcurrent adjacent to the current overcurrent when the current overcurrent is greater than the smallest overcurrent among the multiple overcurrents. By taking the duration between the adjacent smaller overcurrent and the current overcurrent as the cumulative duration of the current overcurrent, a certain safety margin is provided, which can ensure that the control cut-off circuit is carried out before the load is damaged and fails, and effective overcurrent protection is performed.
[0076] The above is a load overcurrent protection method provided by another embodiment of the present invention, which can achieve the same Figure 1The same beneficial effects as those of the corresponding embodiments are achieved, and overcurrent detection can be performed based on at least one pre-set overcurrent current, which is conducive to flexibly obtaining the overcurrent current according to actual needs.
[0077] Another aspect of the present invention provides a load overcurrent protection system. Figure 4 As shown, Figure 4 It is a structural schematic diagram of a load overcurrent protection system provided by an embodiment of the present invention, which may include a circuit unit 41 and a battery management unit 42. The circuit unit 41 includes a power supply 411, a current sensor 412, an active fuse 413 and a load 414 arranged in series. The battery management unit 42 is used to obtain the current collected by the current sensor 412; when the current is greater than the rated current, the accumulated duration of at least one overcurrent is obtained; based on the accumulated duration of at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in at least one overcurrent, the accumulated damage is determined; when the accumulated damage is equal to a preset threshold, the active fuse 413 is controlled to cut off the circuit where the load 414 is located.
[0078] In some embodiments, the load 414 may include a relay, and the battery management unit 42 may be a battery management system (BMS).
[0079] In some embodiments, obtaining the accumulated duration of at least one overcurrent current may include real-time collection of the accumulated duration of the overcurrent current; or, obtaining the accumulated duration of multiple overcurrent currents, wherein the multiple overcurrent currents are arranged at equal intervals or the difference between any two adjacent overcurrent currents in the multiple overcurrent currents increases with the increase of the overcurrent current.
[0080] In some embodiments, obtaining the cumulative duration of at least one overcurrent may include: determining the cumulative duration of the current overcurrent based on the duration between the current overcurrent and the rated current; the current overcurrent is the smallest overcurrent among at least one overcurrent; and / or, determining the cumulative duration of the current overcurrent based on the duration between the current overcurrent and a smaller overcurrent adjacent to the current overcurrent; the current overcurrent is greater than the smallest overcurrent among at least one overcurrent.
[0081] In some embodiments, the battery management unit 42 is further used to obtain at least one preset overcurrent, wherein at least part of the at least one overcurrent has a certain margin relative to an actual achievable overcurrent of the loop.
[0082] In some embodiments, when the accumulated duration of an overcurrent is obtained, the accumulated damage is determined based on the ratio of the accumulated duration to the overcurrent failure duration corresponding to the overcurrent; when the accumulated durations of multiple overcurrents are obtained, the ratio of the accumulated duration of each overcurrent in the multiple overcurrents to the corresponding overcurrent failure duration is obtained, and the ratios corresponding to the multiple overcurrents are summed to obtain the accumulated damage.
[0083] In some embodiments, the load overcurrent protection system may also include a test circuit unit 43, which may include a test power supply 431, a test current sensor 432, a test load 433 of the same model as the load 414, and a test battery management unit 434. The test power supply 431, the test current sensor 432 and the test load 433 are connected in series.
[0084] The test battery management unit 434 is used to obtain the working duration of the test load 433 from the effective state to the complete failure state in the loop under at least one overcurrent current, and determine the working duration as the overcurrent failure duration of the corresponding overcurrent current.
[0085] It should be noted that the battery management unit 42 may be used as the test battery management unit 434 , or the battery management unit 42 and the test battery management unit 434 may be different, and data may be exchanged between the battery management unit 42 and the test management unit 434 .
[0086] The above is a load overcurrent protection system provided by an embodiment of the present invention, which can achieve the same beneficial effects as any of the above method embodiments when running.
[0087] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiments of the present invention can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of each of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.
[0088] In another aspect of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, and when the computer program is executed by a processor, the load overcurrent protection method described in any of the above embodiments is implemented. The computer-readable storage medium may be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present invention is a non-temporary computer-readable storage medium.
[0089] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims
1. A load overcurrent protection method, characterized in that: include: When the current of the circuit where the load is located is greater than the rated current, obtaining the accumulated duration of at least one overcurrent; Determining cumulative damage based on the accumulated duration of the at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in the at least one overcurrent; When the accumulated damage is equal to a preset threshold, the circuit where the load is located is controlled to be cut off.
2. The method according to claim 1, characterized in that The obtaining of the accumulated duration of at least one overcurrent includes: The accumulated durations of a plurality of overcurrents are obtained, wherein the plurality of overcurrents are arranged at equal intervals or the difference between any two adjacent overcurrents among the plurality of overcurrents increases as the overcurrent increases.
3. The method according to claim 1, characterized in that The step of obtaining the accumulated duration of at least one overcurrent includes: Determining the accumulated duration of the current overcurrent based on the duration between the current overcurrent and the rated current; the current overcurrent being the smallest overcurrent among the at least one overcurrent; and / or, The accumulated duration of the current overcurrent is determined based on the duration between the current overcurrent and a smaller overcurrent adjacent to the current overcurrent; the current overcurrent is greater than the smallest overcurrent of the at least one overcurrent.
4. The method according to any one of claims 1 to 3, characterized in that The method further comprises acquiring the at least one pre-set overcurrent, wherein at least part of the at least one overcurrent has a certain margin relative to an actually achievable overcurrent of the loop.
5. The method according to any one of claims 1 to 3, characterized in that The ratio of the accumulated duration of each overcurrent in the at least one overcurrent to the corresponding overcurrent failure duration is obtained, and the ratios corresponding to the at least one overcurrent are summed to obtain the accumulated damage.
6. A load overcurrent protection system, characterized in that: Including a circuit unit and a battery management unit; The loop unit includes a power supply, a current sensor, an active fuse and a load arranged in series; The battery management unit is used to obtain the current collected by the current sensor; when the current is greater than the rated current, obtain the accumulated duration of at least one overcurrent; Based on the accumulated duration of at least one overcurrent and the overcurrent failure duration corresponding to each overcurrent in the at least one overcurrent, the accumulated damage is determined; when the accumulated damage is equal to a preset threshold, the active fuse is controlled to cut off the circuit where the load is located.
7. The load overcurrent protection system according to claim 6, characterized in that: The load includes a relay.
8. The load overcurrent protection system according to claim 6 or 7, characterized in that: The obtaining of the accumulated duration of at least one overcurrent includes: The accumulated durations of a plurality of overcurrents are obtained, wherein the plurality of overcurrents are arranged at equal intervals or the difference between any two adjacent overcurrents among the plurality of overcurrents increases as the overcurrent increases.
9. The load overcurrent protection system according to claim 6 or 7, characterized in that: The step of obtaining the accumulated duration of at least one overcurrent includes: Determining the accumulated duration of the current overcurrent based on the duration between the current overcurrent and the rated current; the current overcurrent being the smallest overcurrent among the at least one overcurrent; and / or, The accumulated duration of the current overcurrent is determined based on the duration between the current overcurrent and a smaller overcurrent adjacent to the current overcurrent; the current overcurrent is greater than the smallest overcurrent of the at least one overcurrent.
10. The load overcurrent protection system according to claim 6 or 7, characterized in that: The battery management unit is further used to obtain the at least one pre-set overcurrent, wherein at least part of the at least one overcurrent has a certain margin relative to an actually achievable overcurrent of the loop.
11. The load overcurrent protection system according to claim 6 or 7, characterized in that: The ratio of the accumulated duration of each overcurrent in the at least one overcurrent to the corresponding overcurrent failure duration is obtained, and the ratios corresponding to the at least one overcurrent are summed to obtain the accumulated damage.
12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the load overcurrent protection method according to any one of claims 1 to 5 is implemented.