Over-current protection circuit, over-current protection control method and electronic equipment

Abstract

The invention relates to the technical field of electrical automation, in particular to an overcurrent protection circuit and electronic equipment. The circuit comprises a sampling module, a comparison module and an execution module. Wherein the sampling module is arranged in a power supply loop between a power receiving load and a power supply, and the sampling module is used for collecting power supply current in the power supply loop to obtain a sampling signal; the comparison module is connected with the sampling module and used for receiving the sampling signal and comparing the sampling signal with a preset reference value to obtain a comparison signal; the execution module is connected with the sampling module, the execution module is further connected into a power supply loop, and the execution module is used for receiving the comparison signal and controlling the power supply loop to be switched on and switched off according to the comparison signal; and the execution module comprises a memory trigger unit, and the memory trigger unit is used for latching the comparison signal representing the abnormity and maintaining the turn-off of the power supply loop. The circuit can thoroughly cut off a power supply loop in an overcurrent scene, and the safety of overcurrent protection is improved.

Description

Technical Field

[0001] The present application relates to the field of electrical automation technology, and in particular to an overcurrent protection circuit, an overcurrent protection control method, and an electronic device. Background Art

[0002] In electrical automation systems, overcurrent protection circuits are a crucial safety mechanism, preventing equipment damage, system failures, and even accidents caused by abnormally high currents. During operation, electrical equipment may generate overcurrent due to factors such as short circuits, sudden load changes, component failure, or external interference. Failure to promptly limit or cut off the fault current can lead to wire overheating, insulation damage, component burnout, and, in severe cases, fire. Therefore, overcurrent protection circuits are widely used in industrial control, power electronics, household appliances, and new energy equipment (such as photovoltaic inverters and electric vehicle charging stations) to ensure system reliability and safety.

[0003] Currently, common overcurrent protection technologies are primarily based on analog circuits or digital control. Their core principle is to monitor the load current in real time and trigger protection when the current exceeds a set threshold. Traditional overcurrent protection schemes typically use fuses, mechanical relays, or electronic switches (such as thyristors and MOSFETs) as actuators, combined with current sensors (such as shunt resistors and Hall effect sensors) and comparator circuits to form a protection circuit. For example, a typical analog overcurrent protection circuit uses a shunt resistor to collect the current signal, amplify it, and compare it with a reference voltage. When the detection signal exceeds the threshold, it drives a relay or switch to disconnect the circuit. Another more basic overcurrent protection solution uses a resettable fuse (such as a PPTC device). Its impedance increases sharply when an overcurrent occurs to limit the current, and it automatically recovers after the fault is eliminated. In more complex systems, overcurrent protection may be integrated into the motor driver or power management chip, for example, using PWM control to adjust the output current, or using a digital signal processor (DSP) to calculate the effective current value in real time and trigger protection.

[0004] However, the current overcurrent protection technology has the following technical problems:

[0005] Existing overcurrent protection technology is difficult to completely cut off the power-load circuit, and its safety needs to be optimized. Summary of the Invention

[0006] Based on this, it is necessary to provide an overcurrent protection circuit, an overcurrent protection control method and an electronic device that can achieve more thorough circuit disconnection processing and enhance the safety of overcurrent protection.

[0007] In a first aspect, the present application provides an overcurrent protection circuit, comprising:

[0008] A sampling module is provided in the power supply circuit between the powered load and the power supply, and is used to collect the power supply current in the power supply circuit to obtain a sampling signal;

[0009] a comparison module, connected to the sampling module, configured to receive the sampling signal and compare the sampling signal with a preset reference value to obtain a comparison signal;

[0010] an execution module connected to the sampling module, the execution module being further connected to the power supply circuit, the execution module being configured to receive the comparison signal and control the on and off of the power supply circuit according to the comparison signal;

[0011] The execution module includes a memory trigger unit, which is used to latch the comparison signal representing the abnormality and maintain the shutdown of the power supply circuit.

[0012] In one embodiment, the overcurrent protection circuit further includes:

[0013] The power operational amplifier module is provided in the power supply circuit and is used for controlling the power supply to the powered load.

[0014] In one embodiment, the execution module includes:

[0015] a first switch unit connected to both the memory trigger unit and the power amplifier module, the first switch unit being controlled by the memory trigger unit and configured to drive the power amplifier module to realize power supply control;

[0016] The second switch unit is connected to both the memory trigger unit and the power amplifier module. The second switch unit is controlled by the memory trigger unit and is used to drive the power amplifier module to achieve power supply control.

[0017] In one embodiment, the first switch unit includes a first switch tube, the first switch tube having an input terminal, an output terminal, and a control terminal, the input terminal of the first switch tube being coupled to the positive power supply terminal of the power supply, the output terminal of the first switch tube being coupled to the positive input terminal of the power operational amplifier module, and the control terminal of the first switch tube being coupled to the output terminal of the memory trigger unit;

[0018] The second switch unit includes a second switch tube, which has an input end, an output end and a control end. The input end of the second switch tube is coupled to the negative power supply end of the power supply, the output end of the second switch tube is coupled to the negative input end of the power operational amplifier module, and the control end of the second switch tube is coupled to the output end of the memory trigger unit.

[0019] In one embodiment, the sampling module includes:

[0020] a sampling resistor having a first end and a second end, wherein the first end of the sampling resistor is coupled to the output end of the power operational amplifier module, and the second end of the sampling resistor is coupled to the input end of the powered load;

[0021] The amplifier has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the amplifier is coupled to the first terminal of the sampling resistor, the second input terminal of the amplifier is coupled to the second terminal of the sampling resistor, and the output terminal of the amplifier is coupled to the input terminal of the comparison module.

[0022] In one embodiment, the memory trigger unit includes a reset terminal, and the reset terminal is used to receive a reset signal provided by a signal source to reset the state of the memory trigger unit.

[0023] In one embodiment, the memory trigger unit includes a first trigger, the first trigger having an input end, an output end, a reset end and a clear end, the input end of the first trigger is coupled to the output end of the comparison module, the output end of the first trigger is coupled to the control end of the first switch tube and the control end of the second switch tube, the reset end of the first trigger is coupled to the signal source, and the clear end of the first trigger is coupled to the output end of the comparison module.

[0024] In one embodiment, a first gating unit is provided between the clear terminal of the first trigger and the output terminal of the comparison module, the first gating unit having an input terminal and an output terminal, the input terminal of the first gating unit being coupled to the output terminal of the comparison module, and the output terminal of the first gating unit being coupled to the clear terminal of the first trigger.

[0025] In one embodiment, a second gating unit is provided between the output end of the first trigger and the control end of the first switch tube and the control end of the second switch tube. The second gating unit has an input end and an output end. The input end of the second gating unit is coupled to the output end of the first trigger, and the output end of the second gating unit is coupled to the control end of the first switch tube and the control end of the second switch tube.

[0026] In a second aspect, the present application further provides an overcurrent protection circuit control method, the method comprising the following steps:

[0027] Acquire a sampling signal, where the sampling signal is a power supply current signal collected in a power supply circuit between the powered load and the power supply;

[0028] Processing the sampled signal based on a preset preprocessing process, and comparing the processed sampled signal with a preset reference value;

[0029] If the sampled signal exceeds the constraint range of the reference value, generating and outputting a comparison signal;

[0030] An execution module is driven based on the comparison signal to switch the power supply circuit to an off state.

[0031] In one embodiment, the method further comprises:

[0032] In response to obtaining a reset signal, the reset signal is used to reset the memory flip-flop state;

[0033] The execution module is driven based on the reset signal to restore the power supply circuit to a conductive state.

[0034] In a third aspect, the present application further provides an electronic device, characterized in that it comprises an overcurrent protection circuit according to any one of the first aspects.

[0035] The above-mentioned overcurrent protection circuit and electronic device, through deduction of the technical features in the claims, can achieve the following beneficial effects corresponding to the technical problems raised in the background technology:

[0036] The present application provides an overcurrent protection circuit, comprising a sampling module, a comparison module and an execution module. The sampling module is provided in a power supply circuit between a powered load and a power supply, and the sampling module is used to collect the power supply current in the power supply circuit and obtain a sampling signal; the comparison module is connected to the sampling module and is used to receive the sampling signal and compare the sampling signal with a preset reference value to obtain a comparison signal; the execution module is connected to the sampling module and is also connected to the power supply circuit, and is used to receive the comparison signal and control the conduction and shutdown of the power supply circuit according to the comparison signal; the execution module includes a memory trigger unit, and the memory trigger unit is used to latch the comparison signal representing an abnormality and maintain the shutdown of the power supply circuit. In implementation, the sampling module can detect the power supply current flowing to the load in the power supply circuit and obtain a sampling signal. Then, the comparison module compares the sampling signal based on a preset reference value. If the sampling signal exceeds the range indicated by the reference value, it can be determined that the current sampling signal represents an abnormality in the power supply current. If no corresponding treatment is performed, it may cause damage to the load or power supply. At this time, the comparison module can output a corresponding comparison signal, which triggers the execution module through the comparison signal, so that the execution module shuts down the power supply circuit when triggered by the comparison signal that represents the abnormality, thereby cutting off the power supply current. At this time, due to the memory trigger unit in the execution module, the fault state is latched, maintaining the off state of the power supply circuit. In this way, it is possible to avoid the temporary disappearance of faults caused by instantaneous overcurrent and other situations, and to avoid the current continuing to flow to the load in the fault scenario, causing load failure, which helps to improve the safety of overcurrent protection, achieve a more thorough circuit disconnection, and prevent the current from continuing to flow to the load, thereby providing a more stable safety guarantee for the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 Schematic diagram of a circuit structure of an overcurrent protection circuit in an embodiment of the present application;

[0039] Figure 2 This is a circuit connection diagram of an overcurrent protection circuit in an embodiment of the present application;

[0040] Figure 3 This is a first flow chart of an overcurrent protection control method in one embodiment of the present application;

[0041] Figure 4 This is a second flow chart of an overcurrent protection control method in one embodiment of the present application.

[0042] Explanation of the accompanying drawings: 100, sampling module; 110, sampling resistor; 120, amplifier; 200, comparison module; 300, execution module; 310, memory trigger unit; 320, first switch unit; 330, second switch unit; 400, power amplifier module; 500, first gating unit; 600, second gating unit; 700, power supply; 800, powered load. DETAILED DESCRIPTION

[0043] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0045] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0046] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0047] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0048] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0049] This application is made by the inventor based on his understanding and research of the following issues:

[0050] Currently, common overcurrent protection technologies are primarily based on analog circuits or digital control. Their core principle is to monitor the load current in real time and trigger protection when the current exceeds a set threshold. Traditional overcurrent protection schemes typically use fuses, mechanical relays, or electronic switches (such as thyristors and MOSFETs) as actuators, combined with current sensors (such as shunt resistors and Hall effect sensors) and comparator circuits to form a protection circuit. For example, a typical analog overcurrent protection circuit uses a shunt resistor to collect the current signal, amplify it, and compare it with a reference voltage. When the detection signal exceeds the threshold, it drives a relay or switch to disconnect the circuit. Another more basic overcurrent protection solution uses a resettable fuse (such as a PPTC device). Its impedance increases sharply when an overcurrent occurs to limit the current, and it automatically recovers after the fault is eliminated. In more complex systems, overcurrent protection may be integrated into the motor driver or power management chip, for example, using PWM control to adjust the output current, or using a digital signal processor (DSP) to calculate the effective current value in real time and trigger protection.

[0051] However, the current overcurrent protection technology has the following technical problems:

[0052] Existing overcurrent protection technology is difficult to completely cut off the power-load circuit, and its safety needs to be optimized.

[0053] Based on the above problems, embodiments of the present application provide an overcurrent protection circuit and an electronic device.

[0054] In one embodiment, an overcurrent protection circuit provided by the embodiment of the present application can be as follows Figure 1 As shown, it includes a sampling module 100 , a comparison module 200 and an execution module 300 .

[0055] The sampling module 100 is provided in the power supply circuit between the powered load 800 and the power supply 700 . The sampling module 100 is used to collect the power supply current in the power supply circuit to obtain a sampling signal.

[0056] Exemplarily, the sampling module 100 may refer to a module for monitoring and collecting current signals in a power supply circuit. The sampling module 100 may also convert the current signal into other processable electrical signals, such as converting the current signal into a voltage signal.

[0057] The comparison module 200 is connected to the sampling module 100 and is configured to receive the sampling signal and compare the sampling signal with a preset reference value to obtain a comparison signal.

[0058] Exemplarily, the comparison module 200 may refer to a module for determining whether a sampled signal exceeds a safe range and outputting a comparison signal to trigger a protective action. The comparison module 200 may be implemented based on a comparator, such as a combination of a dual comparator and a logic gate circuit, a window comparator, or the like. In implementation, the window comparator can be used to set high and low threshold values, respectively, thereby enabling monitoring and response in undercurrent scenarios while providing overcurrent protection for the sampled signal. In scenarios using a window comparator, the window voltages V1 and V2 can be pre-set by a technician.

[0059] The execution module 300 is connected to the sampling module 100 and is also connected to the power supply circuit. The execution module 300 is used to receive the comparison signal and control the conduction and shutdown of the power supply circuit based on the comparison signal. The execution module 300 includes a memory trigger unit 310, which is used to latch the comparison signal indicating an abnormality and maintain the shutdown of the power supply circuit.

[0060] Exemplarily, the execution module 300 may refer to an action execution unit of the overcurrent protection circuit, which can quickly and reliably control the shutdown of the power supply circuit according to the comparison signal output by the comparison module 200. The execution module 300 may include a memory trigger unit 310 and a related switch unit. Among them, the memory trigger unit 310 can latch the fault state, thereby maintaining the protection action of the switch unit. In this way, constructing the execution module 300 based on the memory trigger unit 310 can prevent the power supply from being automatically re-connected after the current is restored in a transient overcurrent scenario. If the fault is not corrected, it may cause damage to the load or power supply. Exemplarily, the memory trigger unit 310 can be implemented based on a D trigger, an RS trigger, an analog latch, an integrated logic circuit, etc. It only needs to be able to realize the functions of fault state latching and manual reset, which will not be elaborated here.

[0061] By implementing the above-mentioned overcurrent protection circuit, the following beneficial effects can be achieved:

[0062] The present application provides an overcurrent protection circuit, comprising a sampling module 100, a comparison module 200, and an execution module 300. The sampling module 100 is provided in a power supply circuit between a powered load 800 and a power supply 700, and is used to collect the power supply current in the power supply circuit to obtain a sampling signal; the comparison module 200 is connected to the sampling module 100, and is used to receive the sampling signal and compare the sampling signal with a preset reference value to obtain a comparison signal; the execution module 300 is connected to the sampling module 100, and is also connected to the power supply circuit, and is used to receive the comparison signal and control the conduction and shutdown of the power supply circuit according to the comparison signal; the execution module 300 includes a memory trigger unit 310, and the memory trigger unit 310 is used to latch the comparison signal representing an abnormality and maintain the shutdown of the power supply circuit. In practice, the sampling module 100 can detect the power supply current flowing to the load in the power supply circuit and obtain a sampling signal. The comparison module 200 then compares the sampling signal based on a preset reference value. If the sampling signal exceeds the range indicated by the reference value, it can be determined that the current sampling signal indicates that there is an abnormality in the power supply current. If no corresponding treatment is taken, it may cause damage to the load or power supply. At this time, the comparison module 200 can output a corresponding comparison signal, which triggers the execution module 300 through the comparison signal, so that the execution module 300 shuts down the power supply circuit under the trigger of the comparison signal indicating the abnormality, thereby cutting off the power supply current. At this time, due to the memory trigger unit 310 in the execution module 300, the fault state is latched, maintaining the shutdown state of the power supply circuit. In this way, it can avoid the temporary disappearance of faults caused by transient overcurrent and other situations, and prevent current from continuing to flow to the load in the fault scenario, causing load failure, which helps to improve the safety of overcurrent protection, achieve more complete circuit disconnection, and prevent current from continuing to flow to the load, thereby providing more stable safety protection for the system.

[0063] In one embodiment, Figure 2 As shown, the overcurrent protection circuit further includes: a power operational amplifier module 400 .

[0064] The power amplifier module 400 is provided in the power supply circuit and is used to control the power supply to the powered load 800 .

[0065] In this embodiment, a power operational amplifier module 400 is provided in the overcurrent protection circuit. Controlling the conduction of the power supply circuit through the power operational amplifier module 400 helps to completely cut off the power by controlling the power operational amplifier, so that the output stage has no current path. Compared with switching devices, the circuit is disconnected more thoroughly, thereby enhancing the safety of overcurrent protection.

[0066] In one embodiment, Figure 2As shown, the execution module 300 includes: a first switch unit 320 and a second switch unit 330 .

[0067] The first switch unit 320 is connected to both the memory trigger unit 310 and the power amplifier module 400 . The first switch unit 320 is controlled by the memory trigger unit 310 and is used to drive the power amplifier module 400 to achieve power supply control.

[0068] The second switch unit 330 is connected to both the memory trigger unit 310 and the power amplifier module 400 . The second switch unit 330 is controlled by the memory trigger unit 310 and is used to drive the power amplifier module 400 to achieve power supply control.

[0069] Exemplarily, the first switch unit 320 and the second switch unit 330 can be implemented based on various switching devices, such as mechanical switches, such as relays; semiconductor switches, such as MOSFETs (metal oxide semiconductor field effect transistors) and IGBTs (insulated gate bipolar transistors); and intelligent integrated switches, such as load switch ICs. The first switch unit 320 and the second switch unit 330 can be any one of the aforementioned exemplary embodiments, or a combination of multiple of the aforementioned exemplary embodiments.

[0070] In this embodiment, the execution module 300 includes a first switch unit 320 and a second switch unit 330. By setting the switch units respectively distributed at the positive power supply end and the negative power supply end, it helps to avoid the negative input end of the power operational amplifier module 400 from forming a loop through the load or the internal loop, causing leakage and other faults, and helps to further improve the safety of overcurrent protection.

[0071] In one embodiment, Figure 1 and Figure 2 As shown, the first switch unit 320 includes a first switch tube, which has an input end, an output end and a control end. The input end of the first switch tube is coupled to the positive power supply end of the power supply 700, the output end of the first switch tube is coupled to the positive input end of the power operational amplifier module 400, and the control end of the first switch tube is coupled to the output end of the memory trigger unit 310.

[0072] In one embodiment, the first switch transistor may be a P-channel field-effect transistor (PMOS), which has a gate terminal G, a source terminal S, and a drain terminal D. In this embodiment, the input terminal of the first switch transistor is the source, the control terminal is the gate, and the output terminal is the drain. In another embodiment, the first switch transistor may be an N-channel field-effect transistor (NMOS). In this embodiment, the input terminal of the first switch transistor is the source, the control terminal is the gate, and the output terminal is the drain.

[0073] The second switch unit 330 includes a second switch tube, which has an input end, an output end and a control end. The input end of the second switch tube is coupled to the negative power supply end of the power supply 700, the output end of the second switch tube is coupled to the negative input end of the power operational amplifier module 400, and the control end of the second switch tube is coupled to the output end of the memory trigger unit 310.

[0074] In one embodiment, the second switch transistor may be an N-channel field-effect transistor (NMOS), which has a gate terminal G, a source terminal S, and a drain terminal D. In this embodiment, the input terminal of the second switch transistor is the source, the control terminal is the gate, and the output terminal is the drain. In one embodiment, the second switch transistor may be an N-channel field-effect transistor (NMOS), which has a source terminal, a gate terminal, and a drain terminal.

[0075] In one embodiment, the sampling module 100 includes a sampling resistor 110 and an amplifier 120 .

[0076] The sampling resistor 110 has a first end and a second end. The first end of the sampling resistor 110 is coupled to the output end of the power amplifier module 400 , and the second end of the sampling resistor 110 is coupled to the input end of the powered load 800 .

[0077] The amplifier 120 has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the amplifier 120 is coupled to the first terminal of the sampling resistor 110, the second input terminal of the amplifier 120 is coupled to the second terminal of the sampling resistor 110, and the output terminal of the amplifier 120 is coupled to the input terminal of the comparison module 200.

[0078] In this embodiment, the sampling module 100 includes a sampling resistor 110 and an amplifier 120 . The amplifier 120 performs a gain on the sampling voltage so that the sampling voltage meets the output requirement of the comparator, which helps to improve the sensitivity of the overcurrent protection.

[0079] In one embodiment, Figure 1 and Figure 2 As shown, the memory trigger unit 310 includes a reset terminal, which is used to receive a reset signal provided by a signal source to reset the state of the memory trigger unit 310.

[0080] In one embodiment, the memory trigger unit 310 includes a first trigger, which has an input end, an output end, a reset end, and a clear end. The input end of the first trigger is coupled to the output end of the comparison module 200, the output end of the first trigger is coupled to the control end of the first switch tube and the control end of the second switch tube, the reset end of the first trigger is coupled to the signal source, and the clear end of the first trigger is coupled to the output end of the comparison module 200.

[0081] In one embodiment, the first flip-flop may be a D flip-flop having a D terminal, a CLK terminal, a Q terminal, and an RST terminal. In this embodiment, the first flip-flop has an input terminal of the D terminal, an output terminal of the Q terminal, a clear terminal of the CLK terminal, and a reset terminal of the RST terminal.

[0082] In this embodiment, the memory trigger unit 310 includes a reset terminal, and intervention reset of the memory trigger unit 310 is achieved through the reset terminal, which helps to improve the flexibility of using the overcurrent protection circuit.

[0083] In one embodiment, Figure 1 and Figure 2 As shown, a first gating unit 500 is provided between the clear terminal of the first trigger and the output terminal of the comparison module 200. The first gating unit 500 has an input terminal and an output terminal. The input terminal of the first gating unit 500 is coupled to the output terminal of the comparison module 200, and the output terminal of the first gating unit 500 is coupled to the clear terminal of the first trigger.

[0084] In one embodiment, Figure 1 and Figure 2 As shown, a second gating unit 600 is provided between the output end of the first trigger and the control end of the first switch tube and the control end of the second switch tube. The second gating unit 600 has an input end and an output end. The input end of the second gating unit 600 is coupled to the output end of the first trigger, and the output end of the second gating unit 600 is coupled to the control end of the first switch tube and the control end of the second switch tube.

[0085] Exemplarily, an input logic conversion unit, an output logic conversion unit, and a clock control logic unit may be included in the first gating unit 500 and the second gating unit 600. The input logic conversion unit is connected to the input end of the first gating unit 500 or the second gating unit 600, the output logic conversion unit is connected to the output end of the first gating unit 500 or the second gating unit 600, and the clock control logic unit is connected to the input end of the output logic conversion unit. In implementation, the input logic conversion unit and the clock control logic unit respectively serve as the input end of the output logic conversion unit. The clock control logic unit provides a clock signal based on a preset timing sequence to control the states of the first gating unit 500 and the second gating unit 600.

[0086] Exemplarily, the first trigger unit may further be provided with a preset value unit, which is connected to the associated clock control logic unit through the preset value unit, and the start control of the first trigger unit is achieved through the clock signal output by the clock control logic unit.

[0087] Exemplarily, in implementation, the clock control logic units in the first trigger unit, the first gating unit 500, and the second gating unit 600 sequentially control the second gating unit 600, the first trigger unit, and the first gating unit 500 to be adjusted to the start state.

[0088] In this embodiment, a gating unit is preposed at the clear end and the control end of the switch tube. By setting the gating unit, it helps to avoid the mis-triggering scenario caused by jitter, thereby improving the stability of the over-current protection circuit.

[0089] In implementation, the sampling module 100 obtains a sampling signal through the sampling resistor 110. The sampling signal is a sampling voltage value. After being amplified by the amplifier 120, an amplified sampling signal VR is obtained, and the amplified sampling signal VR is transmitted to the comparison module 200. Window voltages V1 and V2 are set in the comparison module 200, where V1 is the lower limit reference value and V2 is the upper limit reference value. In the comparison, when V1 < VR < V2, at this time, the sampling signal VR is within the range of the window voltage, that is, in the normal state. At this time, the memory flip-flop outputs a high level, and then drives the gate circuit to output a high level, thereby conducting the PMOS / NMOS. At this time, the PP voltage and the PN voltage normally supply power to the power op-amp, and the power supply loop is normally conducted. In the comparison, when VR < V1 or V2 < VR, the memory flip-flop outputs a low level, and then drives the gate circuit to output a low level, thereby disconnecting the PMOS / NMOS, so that the PP voltage and the PN voltage are disconnected from the power op-amp, and the output of the power op-amp is 0, truncating the power supply loop.

[0090] Based on the same inventive concept, the embodiment of the present application further provides an overcurrent protection circuit control method, which can be implemented based on an overcurrent protection circuit described in any of the above embodiments. Figure 3 As shown, including:

[0091] Step 302: Acquire a sampling signal, where the sampling signal is a power supply current signal collected in a power supply loop between a powered load and a power supply.

[0092] Step 304: Process the sampled signal based on a preset preprocessing process, and compare the processed sampled signal with a preset reference value.

[0093] Step 306: If the sampled signal exceeds the constraint range of the reference value, generate and output a comparison signal.

[0094] Step 308: Drive an execution module based on the comparison signal to switch the power supply circuit to an off state.

[0095] In one embodiment, the method further comprises:

[0096] Step 402: In response to obtaining a reset signal, the reset signal is used to reset the state of the memory trigger;

[0097] Step 404: driving the execution module based on the reset signal to restore the power supply circuit to a conductive state.

[0098] Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes an overcurrent protection circuit as described in any of the above embodiments.

[0099] It can be understood that the above-mentioned overcurrent protection circuit and electronic device can also adopt other forms, and are not limited to the forms mentioned in the above embodiments, as long as they can achieve the function of completely cutting off the power supply circuit in an overcurrent scenario and improving the safety of overcurrent protection.

[0100] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0101] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An overcurrent protection circuit, characterized in that: include: A sampling module is provided in the power supply circuit between the powered load and the power supply, and is used to collect the power supply current in the power supply circuit to obtain a sampling signal; a comparison module, connected to the sampling module, configured to receive the sampling signal and compare the sampling signal with a preset reference value to obtain a comparison signal; an execution module connected to the sampling module, the execution module being further connected to the power supply circuit, the execution module being configured to receive the comparison signal and control the on and off of the power supply circuit according to the comparison signal; The execution module includes a memory trigger unit, which is used to latch the comparison signal representing the abnormality and maintain the shutdown of the power supply circuit.

2. The overcurrent protection circuit according to claim 1, characterized in that: The overcurrent protection circuit further includes: The power operational amplifier module is provided in the power supply circuit and is used for controlling the power supply to the powered load.

3. The overcurrent protection circuit according to claim 2, characterized in that: The execution module includes: a first switch unit connected to both the memory trigger unit and the power amplifier module, the first switch unit being controlled by the memory trigger unit and configured to drive the power amplifier module to realize power supply control; The second switch unit is connected to both the memory trigger unit and the power amplifier module. The second switch unit is controlled by the memory trigger unit and is used to drive the power amplifier module to achieve power supply control.

4. The overcurrent protection circuit according to claim 3, wherein: The first switch unit includes a first switch tube, the first switch tube having an input end, an output end, and a control end, the input end of the first switch tube being coupled to the positive power supply end of the power supply, the output end of the first switch tube being coupled to the positive input end of the power operational amplifier module, and the control end of the first switch tube being coupled to the output end of the memory trigger unit; The second switch unit includes a second switch tube, which has an input end, an output end and a control end. The input end of the second switch tube is coupled to the negative power supply end of the power supply, the output end of the second switch tube is coupled to the negative input end of the power operational amplifier module, and the control end of the second switch tube is coupled to the output end of the memory trigger unit.

5. The overcurrent protection circuit according to claim 2, characterized in that: The sampling module includes: a sampling resistor having a first end and a second end, wherein the first end of the sampling resistor is coupled to the output end of the power operational amplifier module, and the second end of the sampling resistor is coupled to the input end of the powered load; The amplifier has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the amplifier is coupled to the first terminal of the sampling resistor, the second input terminal of the amplifier is coupled to the second terminal of the sampling resistor, and the output terminal of the amplifier is coupled to the input terminal of the comparison module.

6. The overcurrent protection circuit according to claim 3, wherein: The memory trigger unit includes a reset terminal, wherein the reset terminal is used to receive a reset signal provided by a signal source to reset the state of the memory trigger unit; The memory trigger unit includes a first trigger, which has an input end, an output end, a reset end and a clear end. The input end of the first trigger is coupled to the output end of the comparison module, the output end of the first trigger is coupled to the control end of the first switch tube and the control end of the second switch tube, the reset end of the first trigger is coupled to the signal source, and the clear end of the first trigger is coupled to the output end of the comparison module.

7. The overcurrent protection circuit according to claim 6, characterized in that: A first gating unit is provided between the clear terminal of the first trigger and the output terminal of the comparison module, the first gating unit having an input terminal and an output terminal, the input terminal of the first gating unit being coupled to the output terminal of the comparison module, and the output terminal of the first gating unit being coupled to the clear terminal of the first trigger; A second gating unit is provided between the output end of the first trigger and the control end of the first switch tube and the control end of the second switch tube. The second gating unit has an input end and an output end. The input end of the second gating unit is coupled to the output end of the first trigger, and the output end of the second gating unit is coupled to the control end of the first switch tube and the control end of the second switch tube.

8. A method for controlling an overcurrent protection circuit, characterized in that: The method comprises the following steps: Acquire a sampling signal, where the sampling signal is a power supply current signal collected in a power supply circuit between the powered load and the power supply; Processing the sampled signal based on a preset preprocessing process, and comparing the processed sampled signal with a preset reference value; If the sampled signal exceeds the constraint range of the reference value, generating and outputting a comparison signal; An execution module is driven based on the comparison signal to switch the power supply circuit to an off state.

9. The overcurrent protection circuit control method according to claim 8, characterized in that: The method further comprises: In response to obtaining a reset signal, the reset signal is used to reset the memory flip-flop state; The execution module is driven based on the reset signal to restore the power supply circuit to a conductive state.

10. An electronic device, characterized in that: The invention comprises an overcurrent protection circuit according to any one of claims 1 to 9.

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