Self-locking circuit, electronic fuse circuit and chip

Abstract

The invention relates to the technical field of electronic science, in particular to a self-locking circuit, an electronic fuse circuit and a chip, in the self-locking circuit, a reset pin controls a circuit to enter a power supply maintaining state by responding to a self-locking signal of a controller, and a control pin sends a first control signal to the input end of a trigger by responding to the self-locking signal, so that the electronic fuse circuit enters the power supply maintaining state; and the trigger feeds back a second control signal with the same level to the input end through the output end so as to maintain the level state of the output end. Thus, even if the controller loses clear signal control, the trigger in the embodiment of the invention can still maintain the previous output level through the feedback path, so that the circuit can still maintain the level output state at the previous moment in the software reset process, power supply continuity during reset is realized, loss of the power supply state is avoided, and the reliability of the circuit is improved. The requirement of equipment on continuous power supply is met, so that the stability of an automobile electrical system is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic science and technology, and in particular to a self-locking circuit, an electronic fuse circuit and a chip. Background Art

[0002] With the rapid development of automotive electrical systems, electronic fuses (E-fuse), as core components to protect the next generation of vehicle architecture circuits, are becoming an important part of automotive electrical systems.

[0003] However, the external circuit of the existing E-fuse chip can only maintain a specific state during reset, that is, output a high-level or low-level signal, and cannot maintain the power supply state at the previous moment. For example, during software reset, no matter what level the high-side driver (HSD) is in before reset, it will output a fixed high or low level, and cannot maintain the previous power supply state, resulting in power supply state loss. Discontinuous power supply during reset may cause system misoperation or unstable power supply, and cannot meet the continuous power supply requirements of some devices, thereby reducing the stability of the vehicle electrical system. Summary of the invention

[0004] The present invention provides a self-locking circuit and a control method, device, medium and chip thereof, which are used to maintain the power supply state at the last moment and improve the stability of the automobile electrical system.

[0005] In a first aspect, the present application provides a self-locking circuit, the circuit comprising:

[0006] A reset pin, used to control the circuit to enter a power-holding state in response to a self-locking signal of the controller;

[0007] A control pin, for sending a first control signal to an input terminal of a trigger in response to a self-locking signal of a controller, so that the trigger outputs a second control signal of the same level;

[0008] The trigger is used to receive the first control signal through the input end, and feed back a second control signal of the same level to the input end through the output end to maintain the level state of the output end.

[0009] Optionally, the self-locking circuit further includes a feedback subcircuit, the feedback subcircuit includes a feedback diode and a feedback resistor, and the feedback subcircuit is configured between the input terminal and the output terminal of the trigger, then

[0010] The trigger is further used to feed back the high-level signal to the input end through the feedback subcircuit when the second control signal is a high-level signal, so as to form a self-locking loop so that the output end maintains a high-level output state.

[0011] Optionally, the self-locking circuit further includes a reset transistor, the base of the reset transistor is connected to the reset pin, and the collector of the reset transistor is connected to a pull-down resistor.

[0012] The reset pin is also used to respond to the pull-up operation of the controller, output a high-level signal, and conduct the reset transistor;

[0013] The reset transistor is used to transmit current to the ground through the pull-down resistor to control the self-locking circuit to release the power supply holding state.

[0014] Optionally, the self-locking circuit further includes a filter capacitor, and the filter capacitor is configured between the input terminal of the trigger and ground.

[0015] Optionally, the control pin is further used to send an input signal of input level to the trigger;

[0016] The trigger is further configured to output an output signal of a system power level in response to the input signal and based on a connected system power supply, wherein the system power level is different from the input level.

[0017] In a second aspect, the present application provides an electronic fuse circuit, the electronic fuse circuit comprising a controller, a self-locking circuit and a driver.

[0018] The controller is used to send a self-locking signal to the self-locking circuit to make the self-locking circuit enter a power supply holding state;

[0019] The self-locking circuit is used to continuously output an output signal of the same level state to the driver in response to the self-locking signal;

[0020] The driver is used to maintain the signal output at the same level based on the level of the output signal of the self-locking circuit.

[0021] Optionally, the self-locking circuit includes a reset pin, a control pin and a trigger, the reset pin and the control pin are connected to the controller, and the output end of the trigger is connected to the input end of the driver.

[0022] The reset pin is used to control the self-locking circuit to enter a power holding state in response to the self-locking signal;

[0023] The control pin is used to send a first control signal to the input end of the trigger in response to the self-locking signal, so that the trigger outputs a second control signal of the same level;

[0024] The trigger is used to receive the first control signal through the input end, and feed back a second control signal of the same level to the input end through the output end to maintain the level state of the output end;

[0025] The driver is used to maintain the signal output in the same level state based on the level state of the output terminal of the trigger.

[0026] Optionally, the self-locking circuit further includes a reset transistor, the base of the reset transistor is connected to the reset pin, and the collector of the reset transistor is connected to a pull-down resistor.

[0027] The controller is further used to perform a pull-up operation on the reset pin so that the reset pin outputs a high level signal;

[0028] The reset pin is further used to output a high level signal and turn on the reset transistor in response to the pull-up operation;

[0029] The reset transistor is used to transmit current to the ground through the pull-down resistor to control the self-locking circuit to release the power supply holding state.

[0030] Optionally, the self-locking circuit further includes a feedback subcircuit, the feedback subcircuit includes a feedback diode and a feedback resistor, and the feedback subcircuit is configured between the input terminal and the output terminal of the trigger, then

[0031] The trigger is further used to feed back the high-level signal to the input end through the feedback subcircuit when the second control signal is a high-level signal, so as to form a self-locking loop so that the output end maintains a high-level output state.

[0032] In a third aspect, the present application provides a chip, comprising the self-locking circuit in the first aspect and / or the electronic fuse circuit in the second aspect.

[0033] The beneficial effects of the present invention are as follows:

[0034] The embodiment of the present application provides a self-locking circuit, an electronic fuse circuit and a chip. In the self-locking circuit, the controller controls the circuit to enter a power holding state through a reset pin, and sends a first control signal to the input end of the trigger through a control pin, so that the trigger feeds back a second control signal of the same level to its input end through the output end to maintain the level state of the output end. In this way, even when the controller loses clear signal control, the trigger in the embodiment of the present application can still maintain the previous output level through the feedback path, so that the E-fuse chip circuit can still maintain the effect of the level output state at the previous moment during the software reset process, realize the power supply continuity during reset, avoid the loss of power supply state, meet the equipment's demand for continuous power supply, and thus improve the stability of the automotive electrical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0036] Figure 1 A schematic diagram of an electronic fuse circuit of a related technology provided by an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a self-locking circuit provided in an embodiment of the present application;

[0038] Figure 3 A schematic structural diagram of another electronic fuse circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other. In addition, although the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in an order different from that here.

[0040] The terms "first" and "second" in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the term "comprising" and any of their variations are intended to cover non-exclusive protection. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices. "Multiple" in the present application can mean at least two, for example, can be two, three or more, and the embodiments of the present application are not limited.

[0041] The term "and / or" in the embodiments of the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] The following is a brief introduction to the design concept of the embodiments of the present application.

[0043] With the rapid development of automotive electrical systems, electronic fuses (E-fuse) are becoming an important part of automotive electrical systems as core components to protect the next generation of vehicle architecture circuits. E-fuse is often installed on the zone control unit (ZCU) of the regional architecture to replace fuses and relays to power other controllers at the back end. Compared with traditional mechanical fuses, electronic fuses not only have higher precision and controllability, but can also be programmed and controlled by software, greatly improving the flexibility and response speed of the power distribution system.

[0044] However, the E-fuse chip circuits in related technologies, such as IFX's BTSxx series, TI's Tpsxx series, and ST's VN9xx series, can only maintain a specific state (such as outputting a high level or a low level) when the reset or control signal is switched, but cannot maintain the last power supply state. Figure 1Shown is a circuit diagram of an E-fuse in a related art provided by an embodiment of the present application. In the circuit, when the I / O of the microcontroller unit (MCU) is pulled high, the HSD outputs a high level. When the input / output (I / O) terminal of the MCU is pulled low, the HSD outputs a low level. When the software is reset, the I / O terminal of the MCU will enter a high-impedance state, which means that the I / O port does not provide a clear high / low level signal. At this time, the R1 resistor determines the output state of the HSD. If R1 is selected, the HSD will output a high-level signal. If R1 is not selected, the HSD will output a low-level signal. This means that if the HSD output is a high or low-level signal before the reset, it cannot be ensured that the level state remains unchanged during the reset process, but is limited by the logic of the external circuit design (i.e., whether R1 is selected or not). Obviously, during software reset, the E-fuse chip circuit in the related technology will output a fixed high level or low level no matter what level state the HSD is in before reset, and will not be able to maintain the previous power supply state, resulting in discontinuous power supply during reset, which may cause system misoperation or unstable power supply, and cannot meet the continuous power supply requirements of certain devices, thereby affecting the stability of the vehicle's electrical system.

[0045] In view of the above problems, an embodiment of the present application provides a self-locking circuit, in which the reset pin controls the circuit to enter a power holding state by responding to a self-locking signal of a controller, and the control pin sends a first control signal to the input end of the trigger by responding to the self-locking signal, so that the trigger feeds back a second control signal of the same level to its input end through the output end to maintain the level state of the output end. In this way, even when the controller loses clear signal control, the trigger in the embodiment of the present application can still maintain the previous output level through the feedback path, so that the circuit can still maintain the effect of the level output state at the previous moment during the software reset process, realize the power supply continuity during reset, avoid the loss of power supply state, meet the equipment's demand for continuous power supply, and thus improve the stability of the automotive electrical system.

[0046] The following briefly introduces the application scenarios to which the technical solutions of the embodiments of the present application can be applied. It should be noted that the application scenarios introduced below are only used to illustrate the embodiments of the present application and are not limited. In the specific implementation process, the technical solutions provided by the embodiments of the present application can be flexibly applied according to actual needs.

[0047] The solution provided by the embodiment of the present application can be applied to most power distribution systems, especially to application scenarios that need to maintain the last power supply status, and is used to improve the stability and safety of load control. For example, in a vehicle operation scenario, when a controller or power supply fails, the working state of the load can continue to be maintained to avoid a complete loss of load control; for example, in a smart medical scenario, when a control unit of a medical device fails, certain key devices can maintain their previous working state to ensure patient safety; for another example, in a safety control scenario of industrial automation equipment, it is ensured that certain important equipment or safety equipment can still work normally when a controller or power supply fails.

[0048] Of course, the method provided in the embodiment of the present application is not limited to the above application scenarios, but can also be used in other possible application scenarios, which are not limited by the embodiment of the present application. The functions that can be realized by each device in the above application scenarios will be described in the subsequent method embodiments, and no further details will be given here.

[0049] Below, in combination with the application scenarios described above, the system and method provided by the exemplary embodiments of the present application are described with reference to the accompanying drawings. It should be noted that the above application scenarios are only shown to facilitate understanding of the spirit and principles of the present application, and the embodiments of the present application are not limited in this regard.

[0050] refer to Figure 2 As shown, Figure 2 A schematic diagram of a self-locking circuit provided in an embodiment of the present application is provided. The self-locking circuit in an embodiment of the present application includes:

[0051] (1) A reset pin (MCU_Reset) is used to control the circuit to enter a power hold state in response to a self-locking signal from the controller.

[0052] (2) A control pin (MCU_Control), used to send a first control signal to an input terminal A of the trigger (U1) in response to a self-locking signal of the controller, so that the trigger (U1) outputs a second control signal of the same level.

[0053] (3) A trigger (U1) is used to receive a first control signal from a controller through an input terminal A and to feed back a second control signal of the same level to the input terminal A through an output terminal Y, thereby forming a self-locking loop to maintain the level state of the output terminal Y.

[0054] In a possible implementation manner, the self-locking circuit of the embodiment of the present application may further include a feedback subcircuit, that is, Figure 2 The feedback diode D1 and the feedback resistor R1 shown in FIG. 1 are provided in FIG. 1 , and the feedback sub-circuit is configured between the input terminal A and the output terminal Y of the trigger U1 .

[0055] Specifically, the feedback resistor R1 can be used to limit the current in the feedback subcircuit, ensuring that the circuit can achieve the self-locking function without destroying the logic level, providing a stable feedback path, and avoiding fluctuations in the output state. The feedback diode D1 can maintain the self-locking state by allowing unidirectional current to flow, that is, when U1 outputs a high level, it can be fed back to the input terminal A through the feedback diode D1 to maintain the output locked state, so that the circuit maintains a stable output after being triggered.

[0056] In a possible implementation, the self-locking circuit of the embodiment of the present application may further include a reset transistor Q1, the base of which is connected to the reset pin (MCU_Reset), and the collector of which is connected to the pull-down resistor R3.

[0057] Specifically, the self-locking circuit can control the state of the self-locking circuit by controlling the conduction or cutoff of the reset transistor Q1. For example, when the output Latch_OUT pin of the circuit is required to output a pulse width modulation signal (Pulse Width Modulation, PWM) of a certain frequency to drive and control other circuits or components, the reset pin can turn on the reset transistor Q1 in response to the pull-up operation of the controller, and the reset transistor Q1 that is turned on can transmit current to the ground by pulling down the resistor R3 to control the self-locking circuit to release the power supply holding state. When the reset pin (MCU_Reset) maintains a low level state, the transistor Q1 is cut off, and the self-locking circuit can enter the self-locking state, so that the circuit maintains the power supply state of the previous moment.

[0058] In a possible implementation, the self-locking circuit of the embodiment of the present application can also send an input signal of input level to the trigger U1 through the control pin (MCU_Control). The trigger U1 responds to the input signal and outputs an output signal of system power supply size different from the input level through the system power supply connected to it, thereby realizing level conversion.

[0059] Specifically, when the input level of the controller's control pin MCU_Control is 3.3V, the trigger U1 detects the input signal and responds. When the system power supply voltage (Voltage Common Collector, VCC) connected to the trigger is 5V, the trigger will output a 5V output signal, that is, converting the 3.3V MCU signal into a 5V HSD chip input signal to achieve level conversion.

[0060] In a possible implementation manner, the self-locking circuit of the embodiment of the present application may further include a filter capacitor C1 , which is configured between the input terminal A of the trigger U1 and the ground.

[0061] Specifically, the filter capacitor C1 can eliminate clutter, filter out high-frequency noise signals, ensure the stability of the input signal, and prevent external electromagnetic interference from affecting the operation of the trigger U1.

[0062] In a possible implementation, the self-locking circuit of the embodiment of the present application may further include a filter resistor R5 connected in series with the filter capacitor, which is used to input a stable level signal to the trigger U1 to prevent it from being suspended.

[0063] In a possible implementation, the self-locking circuit of the embodiment of the present application further includes a resistor R2 configured between the base of the reset transistor Q1 and the reset pin (MCU_Reset), and the resistor R2 is used to limit the current of the reset signal passing through Q1, ensuring that the base current of Q1 is within a safe range, and avoiding damage to the circuit due to excessive current. Similarly, the self-locking circuit may also include a resistor R4 connected to the input terminal A of the trigger U1, which is used to limit the signal current entering the trigger U1, thereby stabilizing its input current signal and preventing false triggering due to interference signals.

[0064] In a possible implementation, due to the need to maintain the last power supply state in the related art, it is necessary to use an I / O expansion chip with a latching function, such as the NCA9539-Q100 chip, but the chip integrates multiple channels and cannot support the control of frequencies of 30Khz and above. In view of the above problems, the response time of the trigger U1 in the embodiment of the present application can be configured to a response time of ns level or higher, so that it can support a maximum PWM frequency of 500kHz to control the power supply state of the electronic fuse. In this way, the output of the self-locking circuit can be supported, that is, the input port IN of the HSD realizes frequency control above 30Khz, so that the E-fuse chip supports entering the capacitor charging mode (Capacitor Charging Mode, CLS).

[0065] In a possible implementation, in the self-locking circuit provided in the embodiment of the present application, the trigger U1 may adopt the SN74LVC1G17 model, the transistor Q1 may adopt the BC817-25 model, and the diode D1 may adopt the BAS40HY model, but the specific types of the components are not limited in the embodiment of the present application, and each component can be replaced with other types or other devices with similar functions. In addition, the various resistors in the embodiment of the present application, such as R4 and R5, may adopt 100k, R2 and R3 may adopt 22k, R1 may adopt a 10k resistance value, and C1 may adopt a 1n capacitance value, but the specific resistance values ​​and capacitance values ​​are not limited in the embodiment of the present application.

[0066] In a possible implementation, the embodiment of the present application further provides an electronic fuse circuit, which may include a controller, a self-locking circuit, and a driver, wherein:

[0067] The controller is used to send a self-locking signal to the self-locking circuit so that the self-locking circuit enters a power supply holding state.

[0068] A self-locking circuit, used for continuously outputting an output signal of the same level state to the driver in response to a self-locking signal of the controller;

[0069] The driver is used to maintain the signal output at the same level state according to the level state of the output signal of the self-locking circuit.

[0070] In this way, the electronic fuse circuit provided in the embodiment of the present application can send a self-locking signal to the self-locking circuit through the controller when the circuit needs to maintain the level output state of the previous moment, so that the self-locking circuit enters the power supply holding state and continuously outputs the output signal of the same level state to the driver connected thereto, so that the driver can maintain the signal output of the same level state according to the level state of the output signal of the self-locking circuit.

[0071] In a possible implementation, the electronic fuse circuit in the embodiment of the present application may adopt the self-locking circuit protected by the aforementioned embodiment, and the self-locking circuit includes a reset pin, a control pin and a trigger, and the reset pin and the control pin are connected to the controller, and the output end of the trigger is connected to the input end of the driver. In this way, the reset pin can respond to the self-locking signal of the controller to control the self-locking circuit to enter the power holding state, and the control pin responds to the self-locking signal to send a first control signal to the input end of the trigger so that the trigger outputs a second control signal of the same level. The trigger receives the first control signal through the input end, and feeds back the second control signal of the same level to the input end through the output end to maintain the level state of the output end of the trigger, so that the driver can maintain the signal output of the same level state according to the level state of the output end of the trigger.

[0072] Specifically, as above Figure 2 As shown, the electronic fuse circuit provided in the embodiment of the present application can send a self-locking signal to the reset pin and the control pin of the self-locking circuit through the controller when the circuit needs to maintain the level output at the previous moment, such as pulling down or not controlling the reset pin (MCU_Reset), so that the circuit enters the power supply holding state. And send a high or low level first control signal to the trigger U1 through the control pin (MCU_Control). After the input terminal A of the trigger U1 receives the first control signal of the control pin (MCU_Control), the output terminal Y is triggered to output the control signal of the same level, so that the driver HSD connected to its output terminal can maintain the signal output of the same level state according to the level state of its output.

[0073] For example, when the control pin (MCU_Control) inputs a high-level first control signal, the input terminal A of the trigger U1 is triggered by a rising edge, and the output terminal Y outputs the same high-level signal, and is fed back to the input terminal A through the feedback diode D1, forming a self-locking loop, locking the output terminal Y to maintain the output of the high-level signal. When the input terminal A of the trigger U1 receives a low-level signal, the output terminal outputs a low-level signal. At this time, the feedback subcircuit does not participate in the process of maintaining the low-level state, because the low-level signal cannot pass through the unidirectional feedback diode D1, but the logic characteristics inside the trigger are sufficient to maintain the low-level output. This is because once the trigger outputs a low level in the logic circuit, unless there is an external intervention signal (such as a high level triggered by a rising edge), the trigger U1 will continue to maintain its current low-level state, so that the driver connected to its output terminal can maintain the signal output of the same level state according to the level state of its output, so that the circuit maintains the low-level output at the previous moment, which will not change even after the MCU is reset.

[0074] In one possible implementation, please refer to Figure 3The schematic diagram of the structure of the electronic fuse (E-fuse) circuit provided by the embodiment of the present application. The circuit is mainly composed of a ZCU including a controller MCU, a high-side driver HSD and a self-locking circuit. Wherein, VBAT represents the power input of the ZCU, and in an automotive electronic system, VBAT is usually a battery voltage of 12V or 24V. MCU is the main control device of the circuit, and is connected to the control pin and reset pin of the self-locking circuit through an input / output interface (Input / Output, I / O) interface, so that the control pin and reset pin of the self-locking circuit are pulled up / low, so that the self-locking circuit enters or releases the power supply holding state. HSD is the core part of the electronic fuse circuit, which is commonly used in the control of the high-side current switch, wherein the IN pin is the control input, the VS pin is the power input, and the OUT pin is the interface of the output current. The IN pin of HSD is connected to the output end of the trigger U1 of the self-locking circuit as an input end, and the OUT pin is connected to the output end of the electronic fuse output (EFUSE OUT, Electronic Fuse Output), i.e., the output end of the electronic fuse. The electronic fuse is mainly used to protect the circuit from overcurrent or short circuit. Once the HSD detects an abnormal current, it will limit or cut off the current to protect the circuit. GND represents the common ground of the circuit. Through the electronic fuse circuit and self-locking circuit provided in the embodiment of the present application, the MCU sends a self-locking signal to the control pin and reset pin of the self-locking circuit through the I / O interface. The self-locking circuit locks or releases the state of the trigger according to the signal sent by the MCU to control the level state of the input terminal IN of the HSD. The HSD controls the output of OUT according to the IN input signal and is connected to the electronic fuse module to realize power supply or power-off protection for the load, so that when the HSD output state is low before the software reset, the HSD still maintains a low level output during the reset process. Similarly, the HSD output state is high before the reset, and during the reset process, the HSD still maintains a high level output, thereby realizing the actual demand of the E-fuse circuit to maintain the last power supply state, and making the output of the self-locking circuit, that is, the input port IN of the HSD realize a frequency control of more than 30Khz, so that it supports entering the CLS mode.

[0075] For the convenience of description, the above parts are divided into each unit module (or module) according to the function and described separately. Of course, when implementing the present application, the functions of each unit (or module) can be implemented in the same one or more software or hardware. It can be understood by those skilled in the art that various aspects of the present application can be implemented as a system, method or program product. Therefore, various aspects of the present application can be specifically implemented in the following forms, namely: a complete hardware implementation method, a complete software implementation method (including firmware, microcode, etc.), or an implementation method combining hardware and software, which can be collectively referred to as "circuit", "module" or "system" here.

[0076] It should be noted that, although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided into multiple units to be embodied.

[0077] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A self-locking circuit, characterized in that: The self-locking circuit comprises: A reset pin, used to control the circuit to enter a power-holding state in response to a self-locking signal of the controller; A control pin, for sending a first control signal to an input terminal of a trigger in response to a self-locking signal of a controller, so that the trigger outputs a second control signal of the same level; The trigger is used to receive the first control signal through the input end, and feed back a second control signal of the same level to the input end through the output end to maintain the level state of the output end.

2. The circuit according to claim 1, characterized in that The self-locking circuit further includes a feedback subcircuit, the feedback subcircuit includes a feedback diode and a feedback resistor, and the feedback subcircuit is configured between the input terminal and the output terminal of the trigger. The trigger is further used to feed back the high-level signal to the input end through the feedback subcircuit when the second control signal is a high-level signal, so as to form a self-locking loop so that the output end maintains a high-level output state.

3. The circuit according to claim 1, characterized in that The self-locking circuit also includes a reset transistor, the base of which is connected to the reset pin, and the collector of which is connected to a pull-down resistor. The reset pin is also used to respond to the pull-up operation of the controller, output a high-level signal and turn on the reset transistor; The reset transistor is used to transmit current to the ground through the pull-down resistor to control the circuit to release the power supply holding state.

4. The circuit according to claim 1, characterized in that The self-locking circuit further includes a filter capacitor, which is configured between the input terminal of the trigger and the ground.

5. The circuit according to claim 1, characterized in that The control pin is also used to send an input signal of input level to the trigger; The trigger is further configured to output an output signal of a system power level in response to the input signal and based on a connected system power supply, wherein the system power level is different from the input level.

6. An electronic fuse circuit, characterized in that: The electronic fuse circuit includes a controller, a self-locking circuit and a driver. The controller is used to send a self-locking signal to the self-locking circuit to make the self-locking circuit enter a power supply holding state; The self-locking circuit is used to continuously output an output signal of the same level state to the driver in response to the self-locking signal; The driver is used to maintain the signal output at the same level based on the level of the output signal of the self-locking circuit.

7. The circuit according to claim 6, characterized in that The self-locking circuit includes a reset pin, a control pin and a trigger, wherein the reset pin and the control pin are connected to the controller, and the output end of the trigger is connected to the input end of the driver. The reset pin is used to control the self-locking circuit to enter a power holding state in response to the self-locking signal; The control pin is used to send a first control signal to the input end of the trigger in response to the self-locking signal, so that the trigger outputs a second control signal of the same level; The trigger is used to receive the first control signal through the input end, and feed back a second control signal of the same level to the input end through the output end to maintain the level state of the output end; The driver is used to maintain the signal output in the same level state based on the level state of the output terminal of the trigger.

8. The circuit according to claim 7, characterized in that The self-locking circuit also includes a reset transistor, the base of which is connected to the reset pin, and the collector of which is connected to a pull-down resistor. The controller is further used to perform a pull-up operation on the reset pin so that the reset pin outputs a high level signal; The reset pin is further used to output a high level signal and turn on the reset transistor in response to the pull-up operation; The reset transistor is used to transmit current to the ground through the pull-down resistor to control the self-locking circuit to release the power supply holding state.

9. The circuit according to claim 7, characterized in that The self-locking circuit further includes a feedback subcircuit, the feedback subcircuit includes a feedback diode and a feedback resistor, and the feedback subcircuit is configured between the input terminal and the output terminal of the trigger. The trigger is further used to feed back the high-level signal to the input end through the feedback subcircuit when the second control signal is a high-level signal, so as to form a self-locking loop so that the output end maintains a high-level output state.

10. A chip, characterized in that: The chip includes the self-locking circuit as described in any one of claims 1 to 5, and / or the electronic fuse circuit as described in any one of claims 6-9.

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