A self-latching drive circuit and apparatus

Abstract

The application belongs to the technical field of power electronics, and specifically discloses a self-locking driving circuit and equipment. The application adopts a modular design including a power module, a trigger module, a self-locking module and a voltage stabilizing output module. The trigger module outputs a self-locking indication signal when detecting an external trigger signal to ensure trigger reliability; the self-locking module enters self-locking based on the indication, adjusts and locks the voltage signal of the power module as a stable switching signal, thereby avoiding accidental fluctuations of the output level; and the voltage stabilizing output module switches from zero level to power voltage output according to the switching signal, realizing controlled conversion of the output level. Compared with the prior art, the technical scheme realizes clear signal flow logic through the synergistic effect of the self-locking mechanism and the voltage stabilizing output, effectively solves the problem of unstable output level state, and significantly improves the reliability of the entire driving system.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, specifically relating to a self-locking drive circuit and device. Background Technology

[0002] Self-locking drive circuits are a classic electrical control technology. Their core design goal is to maintain the circuit's current on or off state even after the trigger signal disappears, thus achieving state memory or retention. In early industrial automation and control systems, this type of circuit was fundamental for achieving continuous equipment operation or safety interlocking. Traditional self-locking circuits are typically built based on relays or contactors, utilizing a pair of normally open auxiliary contacts of the relay connected in parallel with the start button to form a self-holding current path. When the start button is pressed momentarily, the relay coil is energized, and its normally open auxiliary contacts close. Even after the start button is released, current continues to power the coil through this closed auxiliary contact until the stop button is pressed, cutting off the circuit. While this electromechanical solution is simple and reliable, it has inherent drawbacks such as large size, slow response speed, limited mechanical life, and susceptibility to arcing interference.

[0003] With the development of semiconductor technology, self-locking functions are increasingly being implemented using transistors, thyristors, or integrated logic chips. This not only significantly reduces circuit size, improves response speed and reliability, but also facilitates more complex logic control and status indication. However, current self-locking drive circuits suffer from unstable output voltage levels. Specifically, in the on-state, the high-level output often fails to reach the ideal power supply voltage, while in the off-state, the low-level output is difficult to stabilize at an absolute 0V. This imperfection directly reduces the system's noise immunity, potentially causing false triggering or incorrect status judgment when driving subsequent digital logic circuits. Furthermore, if used for precision control or analog signal processing, it introduces errors, severely impacting the reliability and performance of the entire system. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a self-locking drive circuit and device, which aims to solve the problem that the output level of the current self-locking drive circuit is not stable enough, resulting in poor reliability of the entire drive system.

[0005] The first aspect of this application relates to a self-locking drive circuit, comprising: a power supply module, a trigger module, a self-locking module, and a voltage regulator output module; the power supply module is connected to the first input terminal of the self-locking module and the first input terminal of the voltage regulator output module respectively; the input terminal of the trigger module is connected to an external signal source, and the output terminal of the trigger module is connected to the first input terminal of the self-locking module; the output terminal of the self-locking module is connected to the second input terminal of the voltage regulator output module; the output terminal of the voltage regulator output module is connected to the unit to be driven; the trigger module is used to output a self-locking indication signal to the self-locking module when a first trigger signal transmitted from an external signal source is detected; the self-locking module is used to enter a self-locking state based on the self-locking indication signal, adjust and lock the voltage signal of the power supply module to a first switching signal and transmit it to the voltage regulator output module; the voltage regulator output module is used to switch between outputting a zero-level signal to the unit to be driven and outputting the voltage signal of the power supply module to the unit to be driven according to the first switching signal.

[0006] In one embodiment, the circuit further includes: a self-locking clearing module; the input terminal of the self-locking clearing module is connected to an external signal source, and the output terminal of the self-locking clearing module is connected to a second input terminal of the self-locking module; the self-locking clearing module is used to output a release self-locking indication signal to the self-locking module when a second trigger signal transmitted by the external signal source is detected; the self-locking module is used to exit the self-locking state based on the release self-locking indication signal, and after the release self-locking indication signal ends, output the voltage signal of the power supply module to the regulated output module.

[0007] In one embodiment, the power module includes: a working power supply and a first resistor; the working power supply is connected to a first terminal of the first resistor; the second terminal of the first resistor is connected to a first input terminal of a self-locking module and a first input terminal of a voltage-regulated output module, respectively.

[0008] In one embodiment, the triggering module includes: a first diode; the anode of the first diode is connected to an external signal source, and the cathode of the first diode is connected to the second input terminal of the self-locking module.

[0009] In one embodiment, the voltage regulation output module includes: a second resistor, a third resistor, a first capacitor, and a first MOSFET; the first end of the second resistor is connected to the operating power supply, and the second end of the second resistor is connected to the driven unit and the drain of the first MOSFET respectively; the first end of the third resistor is connected to the power supply module, the first end of the first capacitor, and the gate of the first MOSFET respectively, and the second end of the third resistor is connected to the second end of the first capacitor and the source of the first MOSFET respectively; the source of the first MOSFET is also grounded.

[0010] In one embodiment, the self-locking clearing module includes: a fourth resistor, a second capacitor, and a second MOSFET; the first end of the fourth resistor is connected to the first end of the second capacitor, the gate of the second MOSFET, and an external signal source, respectively; the second end of the fourth resistor is connected to the second end of the second capacitor and the source of the second MOSFET, respectively; the drain of the second MOSFET is connected to the power supply module, and the source of the second MOSFET is grounded.

[0011] In one embodiment, the self-locking module includes: a first locking unit and a second locking unit; the first input terminal of the first locking unit is connected to the first input terminal of the second locking unit and the power module, the second input terminal of the first locking unit is connected to the output terminal of the second locking unit and the output terminal of the trigger module, and the output terminal of the first locking unit is connected to the second input terminal of the second locking unit; the first locking unit is used to output a first locking signal to the second locking unit after receiving a self-locking indication signal to make the second locking unit enter a locked state; the second locking unit is used to output a second locking signal to the first locking unit after receiving the first locking signal to make the first locking unit enter a locked state; the first locking unit and the second locking unit are also used to adjust and lock the voltage signal of the power module to a first switching signal and transmit it to the voltage regulator output module after entering the locked state.

[0012] In one embodiment, the first locking unit includes: a fifth resistor, a third capacitor, and a first transistor; the first end of the fifth resistor is connected to the power module and the first end of the third capacitor respectively, the second end of the fifth resistor is connected to the second end of the third capacitor, the collector of the first transistor, and the second input end of the second locking unit respectively; the base of the first transistor is connected to the output end of the second locking unit and the output end of the trigger module respectively, and the emitter of the first transistor is grounded.

[0013] In one embodiment, the second locking unit includes: a sixth resistor, a seventh resistor, and a second transistor; the first end of the sixth resistor is connected to the output terminal of the first locking unit, and the second end of the sixth resistor is connected to the base of the second transistor; the emitter of the second transistor is connected to the power supply module, and the collector of the second transistor is connected to the first end of the seventh resistor and the second input terminal of the first locking unit respectively; the second end of the seventh resistor is grounded.

[0014] The second aspect of this application relates to a self-locking drive device that uses the self-locking drive circuit of the first aspect. Therefore, the beneficial effects can be found in the relevant description of the first aspect above, and will not be repeated here.

[0015] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: This application employs a modular design that includes a power supply module, a trigger module, a self-locking module, and a voltage regulator output module. It also features a specific connection method where the power supply module is connected to the self-locking module and the voltage regulator output module, the trigger module is connected to the external signal source and the self-locking module, and the self-locking module is connected to the voltage regulator output module. This approach makes the signal flow logic clear and reduces external interference.

[0016] Specifically, the self-locking module is used to enter a self-locking state based on the self-locking indication signal, adjusting and locking the voltage signal of the power supply module to the first switching signal. Locking means that the output state of the self-locking module, i.e., the first switching signal, remains unchanged after being triggered, and this state is no longer affected by subsequent changes in the external trigger signal. This locked and stable first switching signal is provided to the voltage regulator output module, so that the switching action of the voltage regulator output module, from zero level to the output power supply voltage, is based on a stable control signal, rather than a signal that may change transiently. This directly ensures the stability of the output level state. Finally, because the working state of the driven unit depends on a definite level signal that will not change unexpectedly, the stability of the output level solves the problem of poor reliability of the drive system.

[0017] Compared with existing technologies, this technical solution effectively solves the problem of unstable output level through the synergistic effect of self-locking mechanism and regulated output, thereby significantly improving the reliability of the entire drive system. Attached Figure Description

[0018] Figure 1 This is one of the structural block diagrams of the self-locking drive circuit provided in the embodiments of this application; Figure 2 This is one of the circuit topologies of the self-locking drive circuit provided in the embodiments of this application; Figure 3 This is a second structural block diagram of the self-locking drive circuit provided in the embodiments of this application; Figure 4 This is the second circuit topology diagram of the self-locking drive circuit provided in the embodiments of this application; Figure 5 This is the third structural block diagram of the self-locking drive circuit provided in the embodiments of this application.

[0019] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 10 is the power supply module; 20 is the trigger module; 30 is the self-locking module; 31 is the first locking unit; 32 is the second locking unit; 40 is the voltage regulation output module; 50 is the self-locking clear module; R1 to R7 are the first to seventh resistors respectively; C1 to C3 are the first to third capacitors respectively; D1 is the first diode; Q1 is the first MOSFET; Q2 is the second MOSFET; T1 is the first transistor; T2 is the second transistor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] With the continuous advancement of semiconductor technology, self-locking functions are increasingly implemented using transistors, thyristors, or integrated logic chips, significantly optimizing circuit size, response speed, and overall reliability. This also facilitates the implementation of more complex logic control and status indication. However, current self-locking drive circuits still face the problem of unstable output levels in practical applications. Specifically, when on, the high output level often fails to reach the theoretical value of the power supply voltage; while when off, the low level is difficult to maintain at an absolute 0V level. This non-ideal level weakens the system's noise immunity, easily leading to false triggering or misjudgment when driving subsequent digital circuits. If applied to scenarios requiring high level accuracy, such as precision control or analog signal processing, it introduces additional errors, severely impacting system reliability and overall performance.

[0022] Based on this, this application proposes a self-locking drive circuit, please refer to... Figure 1 , Figure 1 This is one of the structural block diagrams of the self-locking drive circuit provided in the embodiments of this application.

[0023] In this embodiment, the self-locking drive circuit includes: a power supply module 10, a trigger module 20, a self-locking module 30, and a voltage regulator output module 40. The power supply module 10 is connected to both the first input terminal of the self-locking module 30 and the first input terminal of the voltage regulator output module 40. The input terminal of the trigger module 20 is connected to an external signal source, and its output terminal is connected to the first input terminal of the self-locking module 30. The output terminal of the self-locking module 30 is connected to the second input terminal of the voltage regulator output module 40. The output terminal of the voltage regulator output module 40 is connected to the unit to be driven.

[0024] It should be noted that the above content illustrates the electrical connections between the modules in the self-locking drive circuit, and the connection between the input and output terminals indicates that the signal flows from the input to the output. This connection can physically or logically connect the input / output terminals of two modules through wires, PCB traces, or signal lines.

[0025] It should be noted that the trigger module 20 is used to output a self-locking indication signal to the self-locking module 30 when it detects the first trigger signal transmitted from an external signal source.

[0026] It is understandable that the trigger module 20 implements a process that triggers a self-locking action based on changes in the state of an external signal. The state change is determined by a first trigger signal transmitted from an external signal source. Therefore, there is some flexibility in the design of the external signal source. For example, the change in the state of the first trigger signal can be a level transition, a pulse edge, or a frequency change. Different devices can be selected to implement this based on different state changes, such as the closing / opening of a mechanical switch, high / low level changes caused by signal comparison, changes in sensor output, or specific timing signals generated by a timer or pulse generator.

[0027] Understandably, all four components mentioned above can achieve manual triggering and self-locking, but the latter three provide convenience for automated control, such as automatic detection, timed tasks, and conditional triggering. Specific implementation can be achieved through hardware, such as filtering circuits and level conversion chips, or software, such as microcontroller programming, to process the original signal to match the input requirements of the trigger module 20. Specific scenarios could include overcurrent detection or overvoltage detection.

[0028] It should be noted that the self-locking indication signal can be any signal that any component in the self-locking module 30 can respond to, and is intended to control the self-locking module 30 to enter the self-locking state, that is, as soon as the self-locking module 30 receives the self-locking indication signal, it immediately enters the self-locking state. Specifically, it can be a high or low level, a pulse change, etc.

[0029] It should be noted that the self-locking module 30 is used to enter the self-locking state based on the self-locking indication signal, adjust and lock the voltage signal of the power supply module 10 as the first switching signal and transmit it to the voltage regulation output module 40.

[0030] It is understandable that the core of the self-locking state lies in its ability to maintain a stable state on its own after receiving an external trigger signal through an internal feedback mechanism, without relying on continuous external intervention. Since the self-locking logic requires energy to maintain, most self-locking states can be released by removing the energy supply. For example, in this embodiment, if the power module 10 is disconnected during the self-locking state, the self-locking module 30 will not work and the self-locking will be released.

[0031] It should be noted that the voltage signal of the power module 10 is the output of the power module 10, which is usually a stable level or a preset pulse. If it is an adjustable power module 10, it is also a stable level or a preset pulse before or after adjustment. Therefore, when the self-locking module 30 enters the self-locking state, the voltage signal of the power module 10 can be directly adjusted to the first switching signal to continuously maintain the output of the first switching signal.

[0032] Understandably, the design of the first switching signal should not only consider the need to differentiate it from the voltage signal of the power module 10, but also take into account the safety limits or optimal recognition range of subsequent modules receiving the first switching signal. Therefore, it is necessary to adjust the voltage signal of the power module 10 to the first switching signal.

[0033] It should be noted that the voltage regulation output module 40 is used to switch between outputting a zero-level signal to the unit to be driven and outputting the voltage signal of the power module 10 to the unit to be driven according to the first switching signal.

[0034] It is understandable that the voltage signals of the two power modules 10 in the circuit can reuse the same power supply to achieve a compact structure; or they can be different power outputs to meet different voltage requirements. Different power outputs can be achieved by multiple power supplies or by a single power supply and transformer circuit.

[0035] Understandably, the voltage regulator output module 40 can switch between outputting a zero-level signal and the voltage signal of the power supply module 10 after receiving the first switching signal. Specifically, whether the switch from a zero-level signal to the voltage signal of the power supply module 10 or vice versa depends on whether the self-locking state in the circuit design maintains a zero-level output or maintains the voltage signal output of the power supply module 10. The former aims to achieve a protection function, disconnecting the driven unit from the connection by outputting a zero-level signal regardless of whether overvoltage, overcurrent, or overheating is detected in the driving unit; the latter aims to achieve a stable output, such as not requiring continuous operation after pressing the button to start.

[0036] Furthermore, this application provides a specific implementation of this embodiment. Please refer to... Figure 2 , Figure 2 This is one of the circuit topologies of the self-locking drive circuit provided in the embodiments of this application.

[0037] In this embodiment, combined with Figure 2 It can be seen that the power module 10 includes: a working power supply and a first resistor R1; the working power supply is connected to the first end of the first resistor R1; the second end of the first resistor R1 is connected to the first input end of the self-locking module 30 and the first input end of the voltage regulation output module 40 respectively.

[0038] Understandably, the first resistor R1 here limits the current flowing from the operating power supply to the subsequent modules, thus providing protection. This allows the power module 10 to simultaneously distribute the power signal from one operating power supply to both the self-locking module 30 and the voltage regulator output module 40 via a single resistor R1.

[0039] Combination Figure 2It is known that the self-locking module 30 includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, a first transistor T1, and a second transistor T2. The fifth resistor R5 and the third capacitor C3 are connected in parallel; one end of the parallel connection is connected to the output terminal of the power supply module 10, the emitter of the second transistor T2, and the voltage regulator output module 40, respectively; the other end of the parallel connection is connected to the first terminal of the sixth resistor R6 and the collector of the first transistor T1, respectively; the second terminal of the sixth resistor R6 is connected to the base of the second transistor T2; the emitter of the first transistor T1 is grounded; the base of the first transistor T1 is connected to the output terminal of the trigger module 20, the first terminal of the seventh resistor R7, and the collector of the second transistor T2, respectively; the second terminal of the seventh resistor R7 is grounded.

[0040] It is understood that in this embodiment, the device that receives the self-locking indication signal is the first transistor T1, that is, the Vbe voltage of the first transistor determines whether it enters the self-locking state.

[0041] Understandably, when no self-locking indication signal is received, i.e., the self-locking module 30 has not entered the self-locking state, the first transistor T1 is not turned on, and the second transistor T2 is also not turned on. Therefore, the voltage signal of the power supply module 10 will be directly input to the voltage regulator output module 40.

[0042] Understandably, upon receiving the self-locking indication signal, the self-locking module 30 enters the self-locking state. The first transistor T1 turns on, generating a voltage drop across the sixth resistor R6, thus turning on the second transistor T2. At this time, regardless of the presence of the self-locking indication signal, due to the voltage drop across the seventh resistor R7, the Vbe voltage remains greater than the conduction value, causing the first transistor T1 to remain on and enter the self-locking state. At this time, due to the voltage division effect, the voltage at one node in parallel is lower than the voltage signal of the power supply module 10, meaning the voltage signal of the power supply module 10 is adjusted to a lower first switching signal.

[0043] Understandably, if the power supply is removed, the voltage drop across the seventh resistor R7 gradually decreases, and the Vbe voltage becomes less than the conduction value. This causes the first transistor to turn off, and eventually the second transistor will also turn off, releasing the latch-up state. It should be noted that the sixth resistor R6 limits the current flowing into the base of the second transistor T2, restricting it to a safe value that allows T2 to saturate and conduct properly. Its resistance value determines the magnitude of the base current of the second transistor T2. The base-emitter junction (BE junction) of the transistor is equivalent to a diode, and its current-carrying capacity is limited. Without the sixth resistor R6, excessive current would instantly burn out the second transistor T2.

[0044] It should be noted that the parallel connection of the fifth resistor R5 and the third capacitor C3 is to prevent a sudden change in the voltage of the third capacitor C3 when the first transistor T1 is turned on or off, causing a jump in its collector voltage. This prevents the voltage of the third capacitor C3 from changing abruptly, thus coupling these jumps to the base of the second transistor T2. The rapid rise or fall of the voltage is equivalent to providing a momentary overdrive current or reverse pump current to the base of the second transistor T2, forcing the second transistor T2 to quickly move past the amplification region and enter the saturation or cutoff state. This greatly shortens the circuit state transition time, making the switching action more crisp and decisive.

[0045] During the stabilization phase after the state transition is complete, the third capacitor C3 is fully charged, which is equivalent to an open circuit. At this time, the fifth resistor R5 acts as a bias resistor, working together with the sixth resistor R6 to provide a stable static operating current to the base of the second transistor T2, ensuring that the second transistor T2 can stably remain in saturation when it needs to be turned on.

[0046] Combination Figure 2 It is known that the voltage regulation output module 40 includes: a second resistor R2, a third resistor R3, a first capacitor C1, and a first MOSFET Q1; the first end of the second resistor R2 is connected to the operating power supply, and the second end of the second resistor R2 is connected to the unit to be driven and the drain of the first MOSFET Q1 respectively; the first end of the third resistor R3 is connected to the power supply module 10, the first end of the first capacitor C1, and the gate of the first MOSFET Q1 respectively, and the second end of the third resistor R3 is connected to the second end of the first capacitor C1 and the source of the first MOSFET Q1 respectively; the source of the first MOSFET Q1 is also grounded.

[0047] Understandably, the gate of the first MOSFET Q1 is used to receive the voltage signal from the power module 10 or the first switching signal. Therefore, it can be clearly seen that when not in the latch-up state, the gate of the first MOSFET Q1 receives the voltage signal from the power module 10, which is higher than the level of the first switching signal. At this time, the first MOSFET Q1 is turned on, causing the voltage regulator output module 40 to output a 0 level to the unit to be driven. However, when in the latch-up state, the gate of the first MOSFET Q1 receives the first switching signal, preventing the first MOSFET Q1 from turning on and causing the voltage regulator output module 40 to output the voltage signal from the power module 10 to the unit to be driven.

[0048] Among them, the second resistor R2 is used for current limiting protection circuit devices, and the third resistor R3 and the first capacitor C1 are connected in parallel to avoid voltage sudden change and current impact on the MOSFET.

[0049] Combination Figure 2 It can be seen that the trigger module 20 includes: a first diode D1; the anode of the first diode is connected to an external signal source, and the cathode of the first diode is connected to the second input terminal of the self-locking module 30.

[0050] It should be noted that the first diode D1 is mainly used to prevent voltage reverse flow. After the self-locking module 30 is activated, there is always a voltage at the base of the first transistor. If the first diode D1 is missing, reverse flow will occur when the trigger signal is lower than the base level of the first transistor. In fact, the selection of components in the trigger module 20 mainly considers the design of the signal source, such as a signal comparison circuit, a sensor, or a timer / pulse generator. The trigger module should be selected based on how to accurately acquire the required signal or protection circuit under these signal sources.

[0051] In this embodiment, due to the modular design including a power supply module, a trigger module, a self-locking module, and a voltage regulator output module, and the specific connection method of connecting the power supply module to the self-locking module and the voltage regulator output module, the trigger module to the external signal source and the self-locking module, and the self-locking module to the voltage regulator output module, the signal flow logic is clear and external interference is reduced.

[0052] Specifically, the self-locking module is used to enter a self-locking state based on the self-locking indication signal, adjusting and locking the voltage signal of the power supply module to the first switching signal. Locking means that the output state of the self-locking module, i.e., the first switching signal, remains unchanged after being triggered, and this state is no longer affected by subsequent changes in the external trigger signal. This locked and stable first switching signal is provided to the voltage regulator output module, so that the switching action of the voltage regulator output module, from zero level to the output power supply voltage, is based on a stable control signal, rather than a signal that may change transiently. This directly ensures the stability of the output level state. Finally, because the working state of the driven unit depends on a definite level signal that will not change unexpectedly, the stability of the output level solves the problem of poor reliability of the drive system.

[0053] Compared with existing technologies, this technical solution effectively solves the problem of unstable output level through the synergistic effect of self-locking mechanism and regulated output, thereby significantly improving the reliability of the entire drive system.

[0054] Furthermore, based on the above embodiments, an unlocking method is provided. Please refer to... Figure 3 , Figure 3 This is the second structural block diagram of the self-locking drive circuit provided in the embodiments of this application.

[0055] In one embodiment, the circuit further includes a self-locking clearing module 50; the input terminal of the self-locking clearing module 50 is connected to an external signal source, and the output terminal of the self-locking clearing module 50 is connected to the second input terminal of the self-locking module 30.

[0056] It should be noted that the self-locking clearing module 50 is used to output a self-locking release indication signal to the self-locking module 30 when a second trigger signal transmitted from an external signal source is detected.

[0057] Understandably, the second trigger signal can be issued by human intervention to activate the self-locking mechanism, such as pressing a reset button; or it can be an automatically triggered signal after an anomaly is detected and resolved. Essentially, it is an external instruction or condition used to initiate the cleanup process. The self-lock release indication signal, on the other hand, is a direct command to the self-locking module 30 to immediately release its self-locking state, resetting the system to its initial ready state.

[0058] It should be noted that the self-locking module 30 is used to exit the self-locking state based on the self-locking release indication signal, and after the self-locking release indication signal ends, it outputs the voltage signal of the power supply module to the voltage regulator output module.

[0059] Understandably, after exiting the self-locking state, the self-locking module 30 will be in a non-self-locking state and will not adjust the voltage signal of the power supply module 10 because it has not received a new self-locking indication signal.

[0060] Furthermore, this application provides a specific implementation of this embodiment. Please refer to... Figure 4 , Figure 4 This is the second circuit topology diagram of the self-locking drive circuit provided in the embodiments of this application.

[0061] In this embodiment, the self-locking clearing module 50 includes: a fourth resistor R4, a second capacitor C2, and a second MOSFET Q2; the first end of the fourth resistor R4 is connected to the first end of the second capacitor C2, the gate of the second MOSFET Q2, and an external signal source, respectively; the second end of the fourth resistor R4 is connected to the second end of the second capacitor C2 and the source of the second MOSFET Q2, respectively; the drain of the second MOSFET Q2 is connected to the power supply module 10, and the source of the second MOSFET Q2 is grounded.

[0062] Understandably, the gate of the second MOSFET Q2 will receive the second trigger signal. When the second trigger signal turns on the second MOSFET Q2, the second terminal of the first resistor R1 will be grounded. At this time, the input to the self-locking module 30 is no longer the voltage signal from the power supply module 10, but a ground signal, i.e., the self-lock release indication signal. At this time, the first transistor T1 and the second transistor T2 are off, and the gate of the first MOSFET Q1 is at a 0 level and not conducting. When the second trigger signal ends, the second MOSFET Q2 is not conducting, the self-lock release indication signal ends, and the input to the self-locking module 30 becomes the voltage signal from the power supply module 10.

[0063] It is understood that by introducing the self-lock release module 50, this embodiment effectively expands the functional flexibility and application scenarios of the self-lock drive circuit, and realizes more intelligent and reliable management of the system reset process.

[0064] Furthermore, based on the above embodiments, please refer to... Figure 5 , Figure 5 This is the third structural block diagram of the self-locking drive circuit provided in the embodiments of this application.

[0065] In this embodiment, the self-locking module 30 is further subdivided. Specifically, the self-locking module 30 includes: a first locking unit 31 and a second locking unit 32. The first input terminal of the first locking unit 31 is connected to the first input terminal of the second locking unit 32 and the power module 10, respectively. The second input terminal of the first locking unit 31 is connected to the output terminal of the second locking unit 32 and the output terminal of the trigger module 20, respectively. The output terminal of the first locking unit 31 is connected to the second input terminal of the second locking unit 32.

[0066] It should be noted that the first locking unit 31 is used to output a first locking signal to the second locking unit 32 after receiving the self-locking indication signal, so that the second locking unit 32 enters the self-locking state.

[0067] It should be noted that the second locking unit 32 is used to output a second locking signal to the first locking unit 31 after receiving the first locking signal, so that the first locking unit 31 enters a self-locking state.

[0068] It is understandable that the unique function of the first locking unit 31 is to be triggered by a self-locking indication signal from an external signal source, thereby controlling the second locking unit 32 to enter the locked state through the first locking signal; and after the second locking unit 32 enters the locked state, it can trigger the second locking signal to replace the self-locking indication signal to control the first locking unit 31 to enter the locked state. This locked state means that the locking unit maintains its current state.

[0069] It should be noted that the first locking unit 31 and the second locking unit 32 are also used to adjust and lock the voltage signal of the power module 10 into the first switching signal and transmit it to the voltage regulator output module 40 after entering the self-locking state.

[0070] Specifically, such as Figure 2 and Figure 4 As shown, the first locking unit 31 may include: a fifth resistor R5, a third capacitor C3, and a first transistor T1; the first end of the fifth resistor R5 is connected to the power module 10 and the first end of the third capacitor C3, respectively; the second end of the fifth resistor R5 is connected to the second end of the third capacitor C3, the collector of the first transistor T1, and the second input terminal of the second locking unit 32, respectively; the base of the first transistor T1 is connected to the output terminal of the second locking unit 32 and the output terminal of the trigger module 20, respectively; and the emitter of the first transistor T1 is grounded. The specific process is as described in the above embodiment and will not be repeated here.

[0071] Specifically, such as Figure 2 and Figure 4As shown, the second locking unit 32 may include: a sixth resistor R6, a seventh resistor R7, and a second transistor T2; the first end of the sixth resistor R6 is connected to the output terminal of the first locking unit 31, and the second end of the sixth resistor R6 is connected to the base of the second transistor T2; the emitter of the second transistor T2 is connected to the power module 10, and the collector of the second transistor T2 is connected to the first end of the seventh resistor R7 and the second input terminal of the first locking unit 31, respectively; the second end of the seventh resistor R7 is grounded. The specific process is as described in the above embodiment and will not be repeated here.

[0072] Understandably, splitting the self-locking module 30 into two locking units provides more possibilities for functional implementation. After splitting, the first locking unit 31 and the second locking unit 32 become relatively independent control nodes. This allows designers to: differentiate triggering / clearing: set slightly different triggering or clearing conditions for the two units, such as different delays, different voltage thresholds, etc., thereby achieving more complex logic control. Simultaneously, status signals can be extracted separately from each unit for system diagnostics. For example, by monitoring the outputs of the two units, it is possible to more accurately determine whether the circuit is in a normal state, establishing a self-lock, or a stable self-lock state.

[0073] In addition to the above embodiments, this application also provides a self-locking drive device. By employing the self-locking drive circuit in the above embodiments, it can solve the problem that the output level of the current self-locking drive circuit is not stable enough, resulting in poor reliability of the entire drive system. Compared with the prior art, the beneficial effects of the self-locking drive device provided by this application are the same as those of the self-locking drive circuit provided in the above embodiments, and other technical features in the self-locking drive device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0074] Specifically, it should be clarified that any device, apparatus, or system that includes the self-locking drive circuit disclosed in this application, regardless of its specific application, should fall within the scope of the "self-locking drive device" described in this application. This includes, but is not limited to: various power control and management devices, digital or analog signal state latching devices, and any device that utilizes the circuit to implement protection or state retention functions. In particular, in the field of semiconductor testing, any semiconductor aging test equipment or test system that employs the self-locking drive circuit of this application to achieve abnormal detection and self-locking protection such as overcurrent, overvoltage, or overtemperature is a typical embodiment of such equipment and should be covered.

[0075] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0076] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0077] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the two parts can rotate relative to each other after connection. "Sliding connection" refers to a connection where the two parts can slide relative to each other after connection.

[0078] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A self-locking drive circuit, characterized in that, include: Power supply module, trigger module, self-locking module, and voltage regulation output module; The power supply module is connected to the first input terminal of the self-locking module and the first input terminal of the voltage regulator output module, respectively; the input terminal of the trigger module is connected to an external signal source, and the output terminal of the trigger module is connected to the first input terminal of the self-locking module; the output terminal of the self-locking module is connected to the second input terminal of the voltage regulator output module; the output terminal of the voltage regulator output module is connected to the unit to be driven. The triggering module is used to output a self-locking indication signal to the self-locking module when a first triggering signal transmitted from an external signal source is detected; The self-locking module is used to enter the self-locking state based on the self-locking indication signal, adjust and lock the voltage signal of the power supply module to the first switching signal and transmit it to the voltage regulator output module; The voltage regulator output module is used to switch between outputting a zero-level signal to the unit to be driven and outputting the voltage signal of the power supply module to the unit to be driven, according to the first switching signal.

2. The self-locking drive circuit as described in claim 1, characterized in that, The circuit also includes: a self-locking clearing module; The input terminal of the self-locking clearing module is connected to an external signal source, and the output terminal of the self-locking clearing module is connected to the second input terminal of the self-locking module. The self-locking clearing module is used to output a self-locking release indication signal to the self-locking module when a second trigger signal transmitted from an external signal source is detected; The self-locking module is used to exit the self-locking state based on the self-locking release indication signal, and after the self-locking release indication signal ends, it outputs the voltage signal of the power supply module to the voltage regulator output module.

3. The self-locking drive circuit as described in claim 1, characterized in that, The power module includes: a working power supply and a first resistor; The power supply is connected to the first end of the first resistor; the second end of the first resistor is connected to the first input end of the self-locking module and the first input end of the voltage regulator output module, respectively.

4. The self-locking drive circuit as described in claim 1, characterized in that, The triggering module includes: a first diode; The anode of the first diode is connected to an external signal source, and the cathode of the first diode is connected to the second input terminal of the self-locking module.

5. The self-locking drive circuit as described in claim 1, characterized in that, The voltage regulation output module includes: a second resistor, a third resistor, a first capacitor, and a first MOSFET; The first end of the second resistor is connected to the operating power supply, and the second end of the second resistor is connected to the unit to be driven and the drain of the first MOS transistor, respectively. The first end of the third resistor is connected to the power module, the first end of the first capacitor, and the gate of the first MOS transistor, respectively. The second end of the third resistor is connected to the second end of the first capacitor and the source of the first MOS transistor, respectively. The source of the first MOS transistor is also grounded.

6. The self-locking drive circuit as described in claim 2, characterized in that, The self-locking clearing module includes: a fourth resistor, a second capacitor, and a second MOSFET; The first end of the fourth resistor is connected to the first end of the second capacitor, the gate of the second MOS transistor, and an external signal source, respectively; the second end of the fourth resistor is connected to the second end of the second capacitor and the source of the second MOS transistor, respectively. The drain of the second MOSFET is connected to the power module, and the source of the second MOSFET is grounded.

7. The self-locking drive circuit as described in claim 1, characterized in that, The self-locking module includes: a first locking unit and a second locking unit; The first input terminal of the first locking unit is connected to the first input terminal of the second locking unit and the power module, the second input terminal of the first locking unit is connected to the output terminal of the second locking unit and the output terminal of the trigger module, and the output terminal of the first locking unit is connected to the second input terminal of the second locking unit. The first locking unit is used to output a first locking signal to the second locking unit after receiving a self-locking indication signal, so that the second locking unit enters a locked state; The second locking unit is used to output a second locking signal to the first locking unit after receiving the first locking signal, so that the first locking unit enters a locked state; The first locking unit and the second locking unit are further configured to, after entering the locked state, adjust and lock the voltage signal of the power module as the first switching signal and transmit it to the regulated output module.

8. The self-locking drive circuit as described in claim 7, characterized in that, The first locking unit includes: a fifth resistor, a third capacitor, and a first transistor; The first end of the fifth resistor is connected to the power module and the first end of the third capacitor, respectively, and the second end of the fifth resistor is connected to the second end of the third capacitor, the collector of the first transistor, and the second input end of the second locking unit, respectively. The base of the first transistor is connected to the output terminal of the second locking unit and the output terminal of the trigger module, respectively, and the emitter of the first transistor is grounded.

9. The self-locking drive circuit as described in claim 7, characterized in that, The second locking unit includes: a sixth resistor, a seventh resistor, and a second transistor; The first end of the sixth resistor is connected to the output terminal of the first locking unit, and the second end of the sixth resistor is connected to the base of the second transistor. The emitter of the second transistor is connected to the power module, and the collector of the second transistor is connected to the first terminal of the seventh resistor and the second input terminal of the first locking unit, respectively. The second terminal of the seventh resistor is grounded.

10. A self-locking drive device, characterized in that, The self-locking drive device uses the self-locking drive circuit as described in any one of claims 1 to 9.

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