Overload protection method and controller

Abstract

The invention provides an overload protection method and a controller. Line current in a target line is compared with a first preset current threshold value and a second preset current threshold value; the first preset current threshold value is smaller than the second preset current threshold value, and the first preset current threshold value is larger than zero; if the line current is larger than a first preset current threshold value and smaller than a second preset current threshold value, whether approximate processing is carried out on the line current or not is judged; and if it is determined that the approximate processing is performed on the line current, generating a turn-off control signal when an accumulated power value obtained according to the approximate processing current reaches a preset power threshold value, so that the target line becomes an open circuit state. The protection effect can be improved, and the working reliability of the electronic equipment is improved.

Description

Technical Field

[0001] The present application relates to the field of automotive electronic technology, and in particular to an overload protection method and a controller. Background Art

[0002] Electronic devices usually have a rated current when they are working. In order to protect the normal operation of the electronic devices, it is necessary to cut off the circuit when the current exceeds the rated value of the electronic devices. The device that performs this protection function is the fuse.

[0003] The operating temperature of the fuse will increase as the line current increases, and it will melt when it reaches its own melting point, thereby achieving a protective function. However, the protection effect is poor, which affects the reliability of the electronic equipment. Summary of the invention

[0004] The embodiments of the present application provide an overload protection method and a controller to improve the protection effect and the reliability of the operation of electronic equipment.

[0005] In a first aspect, an embodiment of the present application provides a controller, the controller comprising: A comparison module, configured to compare the line current flowing through the target line with a first preset current threshold and a second preset current threshold; the first preset current threshold is smaller than the second preset current threshold, and the first preset current threshold is greater than zero; A judgment module, used for judging whether to perform approximation processing on the line current if the line current is greater than a first preset current threshold and less than a second preset current threshold; The processing module is used for generating a shutdown control signal when it is determined to perform approximate processing on the line current and when the accumulated power value obtained according to the approximate processing current reaches a preset power threshold, so that the target line becomes an open circuit state.

[0006] In some embodiments, the processing module is further used to generate a shutdown control signal when it is determined that the line current is not to be approximated and when the cumulative power value obtained according to the line current reaches a preset power threshold, so that the target line becomes an open circuit state.

[0007] In some embodiments, the processing module is further configured to generate the shutdown control signal if the line current is greater than the second preset current threshold, so that the target line becomes an open circuit state.

[0008] In some embodiments, the processing module includes: A comparison unit, used to compare the line current with a set value; the set value is equal to n times the first preset current threshold, where n is a positive number greater than 1 and less than 2; A determination unit is used to determine not to perform approximate processing on the line current if the line current is greater than the set value and less than the second preset current threshold; if the line current is less than the set value, determine to perform approximate processing on the line current.

[0009] In some embodiments, the processing module further includes: The approximate processing unit is used to determine whether the approximate processing current is equal to the first preset current threshold.

[0010] In some embodiments, the controller further comprises: A configuration management module is used to receive a configuration parameter group and pass it to the comparison module and the processing module for parameter update, each of the configuration parameter groups includes multiple configuration parameters, and the multiple configuration parameters include the first preset current threshold, the second preset current threshold, the preset protection time, the preset power threshold and the preset adjustment factor.

[0011] In a second aspect, the present application also provides an overload protection method, comprising: Comparing the line current in the target line with a first preset current threshold and a second preset current threshold; the first preset current threshold is less than the second preset current threshold, and the first preset current threshold is greater than zero; If the line current is greater than a first preset current threshold and less than a second preset current threshold, determining whether to perform approximation processing on the line current; If it is determined to perform approximate processing on the line current, a shutdown control signal is generated when the cumulative power value obtained according to the approximate processing current reaches a preset power threshold, so that the target line becomes an open circuit state.

[0012] In some implementations, after determining whether to perform approximation processing on the line current, the method further includes: If it is determined that the line current is not to be approximated, a shutdown control signal is generated when the accumulated power value obtained according to the line current reaches a preset power threshold, so that the target line becomes an open circuit state.

[0013] In some embodiments, after comparing the line current in the target line with the first preset current threshold and the second preset current threshold, the method further includes: If the line current is greater than the second preset current threshold, the shutdown control signal is generated to make the target line become an open circuit state.

[0014] In some implementations, the determining whether to perform approximation processing on the line current includes: Compare the line current with a set value; the set value is equal to n times the first preset current threshold, where n is a positive number greater than 1 and less than 2; If the line current is greater than the set value and less than the second preset current threshold, determine not to perform approximation processing on the line current; If the line current is less than the set value, it is determined to perform approximate processing on the line current.

[0015] In some implementations, the approximating the line current includes: It is determined that the approximate process current is equal to the first preset current threshold.

[0016] In some embodiments, it further comprises: Receive configuration parameter groups, each of the configuration parameter groups includes a plurality of configuration parameters, the plurality of configuration parameters including the first preset current threshold, the second preset current threshold, a preset protection time, the preset power threshold, and a preset adjustment factor; The stored configuration parameter group is replaced with the received new configuration parameter group.

[0017] An overload protection method and controller provided by an embodiment of the present application compares the line current in the target line with a first preset current threshold and a second preset current threshold; the first preset current threshold is less than the second preset current threshold, and the first preset current threshold is greater than zero; if the line current is greater than the first preset current threshold and less than the second preset current threshold, it is determined whether to perform approximate processing on the line current; if it is determined that the line current is to be approximate processed, a shutdown control signal is generated when the cumulative power value obtained according to the approximate processing current reaches the preset power threshold, so that the target line becomes an open circuit state. The present application can improve the protection effect and improve the reliability of the operation of electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of some exemplary controllers is shown; Figure 2 Another schematic diagram of the structure of some exemplary controllers is shown; Figure 3A schematic diagram showing some exemplary relationships between protection time and line current; Figure 4 Another schematic diagram showing some exemplary relationships between protection time and line current; Figure 5 A schematic flow chart of some exemplary overload protection methods is shown; Figure 6 A schematic diagram showing the effects of some exemplary overload protection methods; Figure 7 A flowchart diagram of some exemplary overload protection methods is shown. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0021] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "exemplarily" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0023] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0024] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0025] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0026] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0027] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0028] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0029] The cumulative power value is calculated based on the current and time. The calculation of the cumulative power value involves the power accumulated over a certain period of time. Assuming that the current I and voltage V remain unchanged over time t, the cumulative power E can be calculated using the following formula: E = P × t = (I × V) × t = I 2 ×R×t; Where E is the accumulated power value (unit: joule, J), t is the time the current passes through (unit: second, s), I is the current passing through the conductor, unit is ampere (A), and R is the resistance of the conductor, unit is ohm (Ω).

[0030] Electronic fuses are usually designed as low-resistance switches, connected in series or in series on the line and controlled by logic circuits. It can not only detect overcurrent and overvoltage conditions, but also provide fast cut-off and self-reset functions. In addition, electronic fuses can also integrate multiple protection functions, such as overvoltage, overcurrent and overtemperature protection, which simplifies circuit design. The emergence of electronic fuses is to solve the problem of low flexibility of traditional fuses. It samples the current in the line, calculates the power, and turns off the power switch device connected in series in the line after reaching the set threshold to achieve the purpose of protection. However, electronic fuses may find it difficult to quickly implement protection functions when the current is small, and cannot meet complex and intelligent application scenarios such as automotive electronics.

[0031] In order to solve the above problems, the present application proposes an overload protection method and a controller.

[0032] Figure 1 Schematic diagrams of some exemplary controller structures are shown. Figure 1 As shown, the controller 1 includes: The comparison module 10 is used to compare the line current I flowing through the target line o and the first preset current threshold I P and the second preset current threshold I S The first preset current threshold I P is less than the second preset current threshold I S , and the first preset current threshold I P greater than zero; The judging module 20 is used to determine if the line current I o Greater than the first preset current threshold I P and is less than the second preset current threshold I S , determine whether the line current I o Perform approximate processing; The processing module 30 is used to determine the line current I o An approximate process is performed, and when the accumulated power value obtained according to the approximate process current reaches a preset power threshold value P0, a shutdown control signal Single-off is generated to make the target line become an open circuit state.

[0033] Specifically, the upstream input of the controller 1 is the line current I flowing through the target line oThat is, the input end of the controller 1 can be connected to the ADC sampling module. The ADC sampling module (Analog-to-Digital Converter) can convert the current signal collected in the target line at the current moment into an analog voltage signal, and convert the analog voltage signal into a digital signal. After further processing (such as filtering and calibration), the digital signal can calculate the actual current value flowing through the target line at the current moment as the line current I at the current moment. o The downstream output of the controller 1 is a control switch connected in series to the target line, and the control switch can be a power switch such as a MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor) or a triode.

[0034] like Figure 1 As shown, the controller 1 includes a comparison module 10, a judgment module 20 and a processing module 30. The ADC sampling module is connected to the comparison module 10 of the controller 1, and the ADC sampling module is connected to the judgment switch. The comparison module 10 is connected to the judgment module 20, and the processing module 30 is connected to the judgment module 20 and the ADC sampling module. In addition, the comparison module 10 is also connected to the configuration management module 40 in the following embodiment to receive the configuration parameter group Single-set in the following embodiment from the configuration management module 40 and update it. In this way, the comparison module 10 can receive the new first preset current threshold I in the received configuration parameter group Single-set. P and the new second preset current threshold I S respectively replace the previous first preset current threshold I P and the old second preset current threshold I S In addition, the processing module 30 is also connected to the configuration management module 40 in the following embodiment to receive and update the configuration parameter group Single-set in the following embodiment from the configuration management module 40, so that the processing module 30 can replace the previous old preset power threshold value P0 with the new preset power threshold value P0 in the received configuration parameter group Single-set and store it.

[0035] The comparison module 10 receives the line current I transmitted by the ADC sampling module o The comparison module 10 stores the first preset current threshold I P and the second preset current threshold I S The line current I obtained from the ADC sampling module o A comparison is performed to obtain a comparison result. If the comparison result is that the line current Io is greater than the first preset current threshold I P and is less than the second preset current threshold I S, that is, the first preset current threshold I P <Line current I o <The second preset current threshold I S , then, the comparison module 10 transmits the comparison result to the judgment module 20. The judgment module 20 is connected to the ADC sampling module to receive the line current I obtained by the ADC sampling module. o , and the judgment module 20 receives the first preset current threshold I P <Line current I o <The second preset current threshold I S When the comparison result is obtained, it will be determined whether the line current I o The judgment module 20 sends the judgment result to the processing module 30. If the judgment result received by the processing module 30 is that the line current I o Then, the processing module 30 processes the line current I collected by the ADC sampling module. o Approximate processing is performed to obtain an approximate processing current, and then the processing module 30 calculates the approximate processing current to obtain an accumulated power value. The processing module 30 compares the stored preset power threshold value P0 with the accumulated power value. Once the accumulated power value reaches (is greater than or equal to) the preset power threshold value P0, a shutdown control signal Single-off is generated. The processing module 30 transmits the generated shutdown control signal Single-off to the control switch. The control switch immediately switches to a disconnected or closed state upon receiving the shutdown control signal Single-off, so that the target line changes from a connected state to an open state. In this way, the present application can o Switching the target line to the disconnected state in time can effectively protect the circuit or electronic equipment equipped with the controller 1, avoid damage to the circuit or electronic equipment, and increase the service life, which can meet the complex and intelligent application scenarios such as automotive electronics.

[0036] In some embodiments, the processing module 30 is further configured to: if it is determined that the line current I o According to the line current I o When the accumulated power value obtained reaches the preset power threshold value P0, a shutdown control signal Single-off is generated to make the target line become an open circuit state.

[0037] Specifically, if the judgment result received by the processing module 30 is that the line current I o The processing module 30 directly processes the line current I collected by the ADC sampling module. oThe accumulated power value is calculated, and the processing module 30 compares the stored preset power threshold value P0 with the accumulated power value. Once the accumulated power value reaches (is greater than or equal to) the preset power threshold value P0, a shutdown control signal Single-off is generated. The processing module 30 transmits the generated shutdown control signal Single-off to the control switch. The control switch immediately switches to a disconnected or closed state upon receiving the shutdown control signal Single-off, so that the target line changes from a connected state to an open state. In this way, the present application can o When the voltage is relatively small, the target line can be switched to an open circuit state in time, which can effectively protect the circuit or electronic equipment equipped with the controller 1, avoid damage to the circuit or electronic equipment, and increase the service life, which can meet the complex and intelligent application scenarios such as automotive electronics.

[0038] In some embodiments, the processing module 30 is further configured to: o Greater than the second preset current threshold I S The shutdown control signal Single-off is generated when the target line is changed to an open circuit state.

[0039] Specifically, the processing module 30 is also connected to the comparison module 10. If the comparison result received by the processing module 30 from the comparison module 10 is that the line current I o Greater than the second preset current threshold I S , then, the processing module 30 directly generates a shutdown control signal Single-off, and the processing module 30 transmits the generated shutdown control signal Single-off to the control switch. The control switch immediately switches to a disconnected or closed state upon receiving the shutdown control signal Single-off, so that the target line changes from a connected state to an open state. In this way, the present application can o When the voltage is large, the target line is immediately switched to an open circuit state, which can effectively protect the circuit or electronic equipment equipped with the controller 1, avoid damage to the circuit or electronic equipment, and increase the service life, which can meet the complex and intelligent application scenarios such as automotive electronics.

[0040] Of course, it should be noted that after the target line is switched to the disconnected state, it is automatically detected whether the overload is eliminated. After the overload is detected to be eliminated, an opening control signal is generated to switch the target line to the connected state so that the circuit can quickly return to normal working state. Wherein, overload elimination means that the line current Io is lower than the first preset current threshold I P Determine that overload clearance is detected.

[0041] In some embodiments, the processing module 30 includes: A comparison unit is used to compare the line current Io with a set value; the set value is equal to the first preset current threshold I P n times, where n is a positive number greater than 1 and less than 2; A determination unit is used to determine if the line current Io is greater than the set value and less than the second preset current threshold I S , determine not to perform approximate processing on the line current Io; if the line current Io is less than the set value, determine to perform approximate processing on the line current Io.

[0042] Specifically, the value is set to be equal to the first preset current threshold I P n times, that is, set the value S=n×I P , n is a positive number, and 1<n<2, that is, the range of the set value is (I P , 2×I P ), for example, you can set the setting value to 1.01×I P , 1.1×I P , 1.15×I P , 1.2×I P The processing module 30 includes a comparison unit and a determination unit. The comparison unit is connected to the ADC sampling module and the configuration management module 40 to respectively obtain the line current I collected by the ADC sampling module. o , and the first preset current threshold I stored in the configuration management module 40 P The comparison unit converts the line current I transmitted by the ADC sampling module into o The first preset current threshold I P n times of the line current I o Greater than the set value and less than the second preset current threshold I S , make sure that the line current I o After approximation processing, the processing module 30 directly calculates the line current I o The corresponding cumulative power value is calculated. Of course, if the comparison result is the line current I o Greater than the first preset current threshold I P and is less than the set value, determine the line current I o To perform approximate processing, the processing module 30 first processes the line current I o After approximate processing, according to the line current I o The corresponding cumulative power value is calculated.

[0043] The present application generates a shutdown control signal to make the target line become disconnected, which is actually divided into three situations: the line current I oReaching (greater than or equal to) the second preset current threshold I S Directly shut down when the line current I o reaches (is greater than or equal to) a set value (for example, 1.1×the first preset current threshold I P ) and is less than the second preset current threshold I S When the line current I o Reaching (greater than or equal to) the first preset current threshold I P Less than a set value (e.g. 1.1×first preset current threshold I P ), according to the first preset current threshold I on the protection curve corresponding to the configuration parameter group P The corresponding preset protection time T SET Shut down.

[0044] In some embodiments, the processing module 30 further includes: An approximate processing unit, configured to determine that the approximate processing current is equal to the first preset current threshold I P .

[0045] Specifically, the line current I is approximated and calculated. o The approximate processing current value is the first preset current threshold I P For example, suppose the value S is set to 1.2×I P , if the line current I o is 1.2 times the first preset current threshold I P , then the line current I o The approximate processing current is the first preset current threshold I P . Assume that the set value S=1.9×I P , if the line current I o is 1.9 times the first preset current threshold I P , then the line current I o The approximate processing current is the first preset current threshold I P The approximate calculation is that the current is within the first preset current threshold I P The first preset current threshold I P . refer to Figures 3 to 5 If the curve is not approximate, the line current I o In a smaller section (slightly larger than the first preset current threshold I P ) corresponding to the protection time T i will be very large, that is, it cannot act in time. The present application uses approximate processing to process the current in a smaller segment (slightly larger than the first preset current threshold I P ) protection time T iConstrained to be the first preset current threshold I P The corresponding preset protection time T SET , in fact, shortens the smaller segment (slightly larger than the first preset current threshold I P ) protection time T i .

[0046] In some embodiments, Figure 2 As shown, the controller 1 also includes: The configuration management module 40 is used to receive the configuration parameter group Single-set and pass it to the comparison module 10 and the processing module 30 for parameter update, each of the configuration parameter groups Single-set includes multiple configuration parameters, and the multiple configuration parameters include the first preset current threshold I P The second preset current threshold I S , the preset protection time T SET , the preset power threshold P0 and the preset adjustment factor K.

[0047] Specifically, Figure 2 As shown, the controller 1 also includes a configuration management module 40, and the configuration management module 40 can establish a communication connection with the management end. The management end is installed and running a script program or application software for managing the controller 1. The operating data of each controller 1 can be obtained through software (the script or application software for managing the controller 1). The operating data includes the configuration parameter group Single-set and the working status of the controller 1, etc. Of course, the user can initiate a request instruction to adjust the configuration parameter group Single-set of the controller 1 through the client. The request instruction includes the device identity information and operating data of the controller 1 to which the user belongs or is used. The client sends the request instruction to the management end, and the client can output a more suitable new configuration parameter group Single-set through a pre-trained configuration parameter model, and return the new configuration parameter group Single-set to the controller 1 corresponding to the device identity information, so that the controller 1 is updated according to the new configuration parameter group Single-set to obtain a new protection curve, such as Figure 3 to Figure 4 , the example shows a plurality of protection curves corresponding to different configuration parameter groups Single-set, so that the comparison module 10 can be based on the updated first preset current threshold I P and the updated second preset current threshold I S With line current I o For comparison, the processing module 30 can compare the updated preset power threshold P0 with the calculated cumulative power threshold, so that the circuit can be flexibly protected with high configurability to meet complex and intelligent application scenarios such as automotive electronics.

[0048] The controller 1 contains configuration registers that accept software configuration to implement the setting of different configuration parameter groups. The controller 1 contains two judgment conditions. The first is the line current I o Reaching the second preset current threshold I S Then directly output the shutdown control signal Single-off; the second is based on the line current I o Calculate the accumulated power value in the circuit, and output the shutdown control signal Single-off after the accumulated power value reaches the preset power threshold P0. The first is a faster protection for the circuit under higher current conditions, and the second is heat accumulation protection, which is an inverse time protection. The protection time T i The current approximation module is used to calculate the power value of the line current I o When the value is slightly greater than the set value, a constant protection time T is generated. i , to avoid pure negative correlation inverse time protection at the first preset current threshold I P The corresponding protection time T when near i Bigger problem.

[0049] Assume that the client user thinks that the configuration parameter group Single-set is not appropriate, for example, S ,I P and T SET If the value is too small, a request instruction can be initiated. After receiving the request instruction, the management end can query the preset configuration parameter relationship table. The configuration parameter relationship table includes multiple configuration parameters, and there are multiple mapping relationships between the multiple configuration parameters.

[0050] For example, Figure 3 As shown, there may be a first preset current threshold I P , a second preset current threshold I S Corresponding to a preset adjustment factor K, wherein the first preset current threshold I P1 , the second preset current threshold I S1 Corresponding to a protection curve L with a curvature of the preset adjustment factor K1 K1 , the first preset current threshold I P2 , the second preset current threshold I S2 Corresponding to a protection curve L with a curvature of the preset adjustment factor K2 K2 , the first preset current threshold I P3 , the second preset current threshold I S3 Corresponding to a protection curve L with a curvature of the preset adjustment factor K3 K3 .

[0051] For example, Figure 4 As shown, it is also possible that a first preset current threshold I P, a second preset current threshold I S Corresponding to a plurality of preset adjustment factors K, wherein the first preset current threshold I P1 , the second preset current threshold I S1 A protection curve L corresponding to the curvature of the preset adjustment factor K1 K1 , and another protection curve L with a curvature of the preset adjustment factor K2 K2 , the first preset current threshold I P3 , the second preset current threshold I S3 A protection curve L corresponding to the curvature of the preset adjustment factor K3 K3 .

[0052] like Figure 5 As shown, and the overload protection scheme L3 provided by this application (corresponding protection time T i Compared with the first scheme L1, the second preset current threshold I S Set direct protection, protection time T at higher current i At the same time, because there is no first preset current threshold I P The current value near the current is approximated, and compared with the solution provided in the present application, when the current is slightly greater than the first preset current threshold I P In case of protection time T i Greater than the preset protection time T SET . Figure 5 The second scheme L2 for segmented protection based on current value is also compared. In the second scheme L2, the protection time T of different current values ​​in the same segment is i The same, but the protection time T of the overload protection scheme provided by this application is i It decreases continuously with the current value, so it is a more accurate protection.

[0053] This application proposes an overload protection method. Figure 6 Schematic diagrams of some exemplary overload protection methods are shown. Figure 6 The process shown includes the following steps: S100, the line current I in the target line o and the first preset current threshold I P and the second preset current threshold I S The first preset current threshold I P is less than the second preset current threshold I S , and the first preset current threshold I P greater than zero; S200, if the line current I o Greater than the first preset current threshold I P and is less than the second preset current threshold IS , determine whether the line current I o Perform approximate processing; S300: If it is determined that the line current I o Approximate processing is performed, and when the accumulated power value obtained according to the approximate processing current reaches a preset power threshold value P0, a shutdown control signal Single-off is generated to make the target line become an open circuit state.

[0054] Specifically, Figure 1 As shown, the controller 1 includes a comparison module 10, a judgment module 20 and a processing module 30. The ADC sampling module is connected to the comparison module 10 of the controller 1, and the ADC sampling module is connected to the judgment switch. The comparison module 10 is connected to the judgment module 20, and the processing module 30 is connected to the judgment module 20 and the ADC sampling module. In addition, the comparison module 10 is also connected to the configuration management module 40 in the following embodiment to receive the configuration parameter group Single-set in the following embodiment from the configuration management module 40 and update it. In this way, the comparison module 10 can receive the new first preset current threshold I in the received configuration parameter group Single-set. P and the new second preset current threshold value replace the previous old first preset current threshold value I P In addition, the processing module 30 is also connected to the configuration management module 40 in the following embodiment to receive and update the configuration parameter group Single-set in the following embodiment from the configuration management module 40, so that the processing module 30 can replace the previous old preset power threshold value P0 with the new preset power threshold value P0 in the received configuration parameter group Single-set and store it.

[0055] The comparison module 10 receives the line current I transmitted by the ADC sampling module o The comparison module 10 stores the first preset current threshold I P and the second preset current threshold are respectively related to the line current I obtained from the ADC sampling module o Compare the size to get the comparison result. If the comparison result is the line current I o Greater than the first preset current threshold I P and is less than the second preset current threshold, that is, the first preset current threshold I P <Line current IoI<Second preset current threshold I S , then, the comparison module 10 transmits the comparison result to the judgment module 20. The judgment module 20 is connected to the ADC sampling module to receive the line current Io acquired by the ADC sampling module, and the judgment module 20 receives the first preset current threshold I P <Line current I o<The second preset current threshold I S When the comparison result is obtained, it will be determined whether the line current I o The judgment module 20 sends the judgment result to the processing module 30. If the judgment result received by the processing module 30 is that the line current I o Then, the processing module 30 processes the line current I collected by the ADC sampling module. o Approximate processing is performed to obtain an approximate processing current, and then the processing module 30 calculates the approximate processing current to obtain an accumulated power value. The processing module 30 compares the stored preset power threshold value P0 with the accumulated power value. Once the accumulated power value reaches (is greater than or equal to) the preset power threshold value P0, a shutdown control signal Single-off is generated. The processing module 30 transmits the generated shutdown control signal Single-off to the control switch. The control switch immediately switches to a disconnected or closed state upon receiving the shutdown control signal Single-off, so that the target line changes from a connected state to an open state. In this way, the present application can o When the voltage is relatively small, the target line can be switched to an open circuit state in time, which can effectively protect the circuit or electronic equipment equipped with the controller 1, avoid damage to the circuit or electronic equipment, and increase the service life, which can meet the complex and intelligent application scenarios such as automotive electronics.

[0056] In some embodiments, the determination of whether the line current I o After approximation, it also includes: If it is determined that the line current I o According to the line current I o When the accumulated power value obtained reaches the preset power threshold value P0, a shutdown control signal Single-off is generated to make the target line become an open circuit state.

[0057] Specifically, if the judgment result received by the processing module 30 is that the line current I o The processing module 30 directly processes the line current I collected by the ADC sampling module. o The accumulated power value is calculated, and the processing module 30 compares the stored preset power threshold value P0 with the accumulated power value. Once the accumulated power value reaches (is greater than or equal to) the preset power threshold value P0, a shutdown control signal Single-off is generated. The processing module 30 transmits the generated shutdown control signal Single-off to the control switch. The control switch immediately switches to a disconnected or closed state upon receiving the shutdown control signal Single-off, so that the target line changes from a connected state to an open state. In this way, the present application can oWhen the voltage is relatively small, the target line can be switched to an open circuit state in time, which can effectively protect the circuit or electronic equipment equipped with the controller 1, avoid damage to the circuit or electronic equipment, and increase the service life, which can meet the complex and intelligent application scenarios such as automotive electronics.

[0058] In some embodiments, the line current I o and the first preset current threshold I P After comparing the current with the second preset current threshold, the following steps are further included: If the line current I o When the current is greater than the second preset current threshold, the shutdown control signal Single-off is generated to make the target line become an open circuit state.

[0059] In some embodiments, the determination of whether the line current I o Approximate processing includes: The line current I o Compare the value with the set value; the set value is equal to the first preset current threshold I P n times, where n is a positive number greater than 1 and less than 2; If the line current I o is greater than the set value and less than the second preset current threshold, determining not to apply the line current I o Perform approximate processing; If the line current I o is less than the set value, determining the line current I o Approximate processing.

[0060] In some embodiments, the line current I o Approximate processing includes: Determine that the approximate processing current is equal to the first preset current threshold I P .

[0061] In some embodiments, it also includes: Receive a configuration parameter group Single-set, each of the configuration parameter groups Single-set includes a plurality of configuration parameters, the plurality of configuration parameters including the first preset current threshold I P , the second preset current threshold, the preset protection time T SET , the preset power threshold P0 and the preset adjustment factor; The stored configuration parameter group Single-set is replaced with the received new configuration parameter group Single-set.

[0062] For example, Figure 7As shown, firstly, the configuration parameter group Single-set required under this working condition is set by software to achieve the corresponding precise protection. The configuration parameter group Single-set includes the preset protection time T SET , the first preset current threshold I P , the second preset current threshold I S , a preset adjustment factor K and a preset power threshold P0. A second preset current threshold I S It is the protection current threshold for directly disconnecting the line. o When the second preset current threshold is reached, the controller 1 directly outputs the shutdown control signal Single-off. P is the thermal protection current threshold, the line current I o Reaching the first preset current threshold I P Net heat accumulation will begin. Preset protection time T SET is the line current I o At the first preset current threshold I P The corresponding protection time T i , determines the time starting point of the protection curve. K is used to adjust the position of the protection curve on the time axis to achieve more flexible protection to adapt to a wider range of working environments. Figure 3 and Figure 4 After the configuration is completed, the sampled line current I o Whether the second preset current threshold I is reached S , if it is greater than the second preset current threshold I S It will directly output the shutdown control signal Single-off to complete the protection. Figures 3 to 5 From the protection curve, that is, the sampled line current I o Greater than the second preset current threshold I S The corresponding protection time T i is zero.

[0063] Line current I o If the second preset current threshold I is not reached S , the controller 1 will determine whether the first preset current threshold I P If the sampled line current I o Reaching the first preset current threshold I P , indicating that the heat in the target circuit needs to be accumulated net, and then the aforementioned Figure 1 The processing module 30 in the circuit will o The size of the line current I o Approximate processing is performed. Approximate processing refers to cutting the current value down to the first preset current threshold value I P , which makes Figure 3 and Figure 4 The protection curve shown has an initial short horizontal line corresponding to a constant protection time T. i , that is, the line current Io is (I P , n×I P ) range, the protection time T i Equal to the preset protection time T SET Then, according to the sampled line current I o The accumulated heat is calculated to obtain the accumulated power value. If the sampled line current I o The first preset current threshold I is not reached P , indicating that the heat in the line needs to be released net, according to the sampled line current I o The dissipation calculation is performed. The cumulative power value calculated by the processing module 30 is compared with the configured preset power threshold P0, so that when the cumulative power value reaches the preset power threshold P0, the shutdown control signal Single-off is output.

[0064] The above specific implementations further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above is only a specific implementation of the present application and is not limited to the protection scope of the present application. Without departing from the purpose of the basic characteristics of the present application, the present application can be embodied in various forms. Therefore, the implementation forms in the present application are used for explanation rather than limitation. Since the scope of the present application is limited by the claims rather than the specification, and all changes within the scope defined by the claims or within the equivalent scope of the scope defined by the claims should be understood to be included in the claims. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A controller, characterized in that: The controller comprises: a comparison module, configured to compare the line current flowing through the target line with a first preset current threshold and a second preset current threshold; the first preset current threshold is less than the second preset current threshold, and the first preset current threshold is greater than zero; the line current is an actual current value flowing through the target line; A judgment module, configured to judge whether to perform approximate processing on the line current if the line current is greater than a first preset current threshold and less than a second preset current threshold; the approximate processing on the line current comprises: determining that the approximate processing current is equal to the first preset current threshold; The processing module is used for generating a shutdown control signal when it is determined to perform approximate processing on the line current and when the accumulated power value obtained according to the approximate processing current reaches a preset power threshold, so that the target line becomes an open circuit state.

2. The controller according to claim 1, characterized in that: The processing module is further configured to generate a shutdown control signal when it is determined that the line current is not to be approximated and when the accumulated power value obtained according to the line current reaches a preset power threshold, so that the target line becomes an open circuit state.

3. The controller according to claim 1, characterized in that: The processing module is further configured to generate the shutdown control signal if the line current is greater than the second preset current threshold, so that the target line becomes an open circuit state.

4. The controller according to claim 1, characterized in that: The processing module comprises: A comparison unit, used to compare the line current with a set value; the set value is equal to n times the first preset current threshold, where n is a positive number greater than 1 and less than 2; A determination unit is used to determine not to perform approximate processing on the line current if the line current is greater than the set value and less than the second preset current threshold; if the line current is less than the set value, determine to perform approximate processing on the line current.

5. The controller according to any one of claims 1 to 4, characterized in that: The controller further comprises: A configuration management module is used to receive a configuration parameter group and pass it to the comparison module and the processing module for parameter update, each of the configuration parameter groups includes multiple configuration parameters, and the multiple configuration parameters include the first preset current threshold, the second preset current threshold, the preset protection time, the preset power threshold and the preset adjustment factor.

6. An overload protection method, characterized in that: include: Comparing the line current in the target line with the first preset current threshold and the second preset current threshold; The first preset current threshold is less than the second preset current threshold, and the first preset current threshold is greater than zero; The line current is the actual current value flowing through the target line; If the line current is greater than a first preset current threshold and less than a second preset current threshold, determining whether to perform approximation processing on the line current; The approximating the line current comprises: determining that the approximated current is equal to the first preset current threshold; If it is determined to perform approximate processing on the line current, a shutdown control signal is generated when the cumulative power value obtained according to the approximate processing current reaches a preset power threshold, so that the target line becomes an open circuit state.

7. The overload protection method according to claim 6, characterized in that: After determining whether to perform approximate processing on the line current, the method further includes: If it is determined that the line current is not to be approximated, a shutdown control signal is generated when the accumulated power value obtained according to the line current reaches a preset power threshold, so that the target line becomes an open circuit state.

8. The overload protection method according to claim 6, characterized in that: After comparing the line current in the target line with the first preset current threshold and the second preset current threshold, the following step further comprises: If the line current is greater than the second preset current threshold, the shutdown control signal is generated to make the target line become an open circuit state.

9. The overload protection method according to claim 6, characterized in that: The determining whether to perform approximate processing on the line current comprises: Compare the line current with a set value; the set value is equal to n times the first preset current threshold, where n is a positive number greater than 1 and less than 2; If the line current is greater than the set value and less than the second preset current threshold, determine not to perform approximation processing on the line current; If the line current is less than the set value, it is determined to perform approximate processing on the line current.

10. The overload protection method according to any one of claims 6 to 9, characterized in that: Also includes: Receive configuration parameter groups, each of the configuration parameter groups includes a plurality of configuration parameters, the plurality of configuration parameters including the first preset current threshold, the second preset current threshold, a preset protection time, the preset power threshold, and a preset adjustment factor; The stored configuration parameter group is replaced with the received new configuration parameter group.

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