A driving circuit capable of maintaining driving ability after power failure

Abstract

This utility model discloses a drive circuit that maintains driving capability after power failure. The drive circuit includes a switching signal circuit unit and a thyristor drive circuit unit. The switching signal circuit unit is a signal triggering circuit that triggers a drive signal to the thyristor drive circuit unit. The switching signal circuit unit includes a power failure sustaining module, a switching module, a voltage regulation and filtering module, and a switching signal module. The power failure sustaining module is connected to the voltage regulation and filtering module and the switching signal module through the switching module, and the voltage regulation and filtering module is connected to the switching signal module. The switching signal module is connected to the thyristor drive circuit unit, and the thyristor drive circuit unit receives the drive signal from the switching signal module to drive the circuit. The power failure sustaining module includes a capacitor sustaining unit, which sustains discharge of the circuit after power failure.

Description

Technical Field

[0001] This application belongs to the field of thyristor drive circuit technology, specifically referring to a drive circuit that maintains drive capability after power failure. Background Technology

[0002] In current power grid equipment, most devices are driven by the opening and closing of solenoid valves, primarily using thyristor drive circuits. Currently, there is a type of device in the power grid powered by a capacitor, where a thyristor outputs a large current to drive a coil, controlling the opening and closing of the circuit. However, the interface circuits used in these devices on the market often experience false triggering, leading to power outages. The thyristor drive circuits are all traditional push-pull circuits, which lose their driving capability after a power outage. Current devices lack driving capability after a power failure, posing a safety risk if an unexpected situation occurs, as the equipment may fail directly. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this application provides a drive circuit that maintains driving capability after power failure, which can maintain the driving capability of the circuit for a short period of time after the power is cut off.

[0004] This utility model provides a drive circuit that maintains driving capability after power failure. The drive circuit includes a switch signal circuit unit and a thyristor drive circuit unit. The switch signal circuit unit is a signal triggering circuit that provides a trigger drive signal to the thyristor drive circuit unit.

[0005] The switching signal circuit unit includes a power-down sustaining module, a switching module, a voltage regulator and filter module, and a switching signal module; the power-down sustaining module is connected to the voltage regulator and filter module and the switching signal module through the switching module, and the voltage regulator and filter module is connected to the switching signal module; the switching signal module is connected to the thyristor driving circuit unit, and the thyristor driving circuit unit receives the driving signal from the switching signal module to drive the circuit;

[0006] The power-down sustaining module includes a capacitor sustaining unit, which sustains discharge after the circuit is powered down.

[0007] Furthermore, according to the drive circuit that maintains driving capability after power failure provided in this application, the capacitor maintenance unit includes a single capacitor or a group of capacitors.

[0008] Further according to the drive circuit that maintains driving capability after power failure provided in this application, the power failure maintenance module further includes a diode D1; the positive terminal of the diode D1 is connected to the power supply, the negative terminal of the diode D1 is connected to the capacitor maintenance unit and the switching module, and the other end of the capacitor maintenance unit is connected to the ground terminal AGND of the drive circuit.

[0009] Further, according to the drive circuit that maintains driving capability after power failure provided in this application, the voltage stabilizing filter module includes inductor L3, resistor R12, resistor R9, resistor R10, capacitor C10, capacitor C11, capacitor C12, capacitor C13, and Zener diode ZD1.

[0010] The inductor L3 and the resistor R12 are connected in series. The resistor R10, the capacitor C11, the capacitor C12 and the capacitor C13 are connected in parallel and connected to the inductor L3 and the resistor R12. The resistor R9, the capacitor C10 and the Zener diode ZD1 are directly connected in parallel and connected to the inductor L3 and the resistor R12.

[0011] Further, according to the drive circuit that maintains driving capability after power failure provided in this application, the switching signal module includes a resistor R11 and a transistor Q5; the base of the transistor Q5 is connected to the resistor R11, and the other end of the resistor R11 is connected to the Zener diode ZD1; the collector of the transistor Q5 is externally connected to a drive signal, and the emitter of the transistor Q5 is connected to the thyristor drive circuit unit.

[0012] Further, according to the drive circuit that maintains driving capability after power failure provided in this application, the thyristor drive circuit unit includes at least two drive circuit sub-units, the drive circuit sub-units have the same structure, and the number of drive circuit sub-units is the same as the number of drive signals; each drive circuit sub-unit is connected to the switch signal circuit unit, and the number of switch signal circuit units is the same as the number of drive circuit sub-units.

[0013] Further, according to the drive circuit that maintains driving capability after power failure provided in this application, the drive circuit subunit includes a capacitor sustaining module, a switch driving module, and a thyristor gate module; the capacitor sustaining module is connected to the switch driving module and the thyristor gate module, the switch driving module is connected to the thyristor gate module, and the thyristor gate module receives signals from the switch driving module for driving.

[0014] Further, according to the drive circuit for maintaining driving capability after power failure provided in this application, the capacitor sustaining module includes a diode D3, a capacitor C3, a resistor R3, and a capacitor C7; the positive terminal of the diode D3 is connected to an external power supply, and the negative terminal of the diode D3 is connected to one end of the resistor R3; the capacitor C3 is connected to the negative terminal of the diode D3, and the other end of the capacitor C3 is connected to the ground terminal AGND of the drive circuit; one end of the capacitor C7 is connected to the other end of the resistor R3, and the other end of the capacitor C7 is connected to the ground terminal AGND of the drive circuit; the external power supply charges the capacitor C7 after passing through the diode D3, the capacitor C3, and the resistor R3.

[0015] Further, according to the drive circuit for maintaining drive capability after power failure provided in this application, the switch drive module includes a resistor R6, a switch Q3, a switch Q4, and a resistor R2; one end of the resistor R2 is connected to a drive signal, and the other end of the resistor R2 is connected to the switch Q3 and the switch Q4; the gate of the switch Q4 is connected to the drive signal through the resistor R2, and the gate of the switch Q3 is connected to the drive signal through the resistor R2; the gates of the switch Q4 and the switch Q3 are both connected to the capacitor sustaining module through the resistor R6; the drains of the switch Q4 and the switch Q3 are both connected to the thyristor gate module;

[0016] The switching levels of the switching transistor Q4 and the switching transistor Q3 are opposite.

[0017] Furthermore, according to the drive circuit that maintains driving capability after power failure provided in this application, the drive circuit further includes a thyristor and its external load circuit, the thyristor and its external load circuit being connected to the thyristor drive circuit unit and receiving the drive signal from the thyristor drive circuit unit.

[0018] The beneficial effects of this utility model are as follows: The drive circuit that maintains driving capability after power failure provided in this application incorporates a power failure maintenance module in both the switch signal circuit unit and the thyristor drive circuit unit. When the power is off, the power failure maintenance module provides power, ensuring that the drive circuit retains its driving capability for up to 5 seconds after power failure. It can also be used in conjunction with external device signals or manual switches to continue maintaining driving capability after power failure. Attached Figure Description

[0019] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the drive circuit structure that maintains driving capability after power failure, as provided in this embodiment.

[0021] Figure 2 This is a schematic diagram of the circuit structure of the switch signal circuit unit provided in this embodiment.

[0022] Figure 3 This is a schematic diagram of the circuit structure of the thyristor drive circuit unit provided in this embodiment.

[0023] Figure 4 This is a schematic diagram of the circuit structure of the thyristor and its external load circuit provided in this embodiment. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] The embodiments of this application will now be further described in conjunction with the accompanying drawings and specific implementation details.

[0028] Figure 1 This is a schematic diagram of the drive circuit structure that maintains driving capability after power failure, as provided in this embodiment.

[0029] like Figure 1 As shown, in this embodiment, the driving circuit includes a switching signal circuit unit and a thyristor driving circuit unit; the switching signal circuit unit is a signal triggering circuit that triggers a driving signal to the thyristor driving circuit unit; the thyristor driving circuit unit drives the thyristor to work according to the driving signal.

[0030] Figure 2 This is a schematic diagram of the circuit structure of the switch signal circuit unit provided in this embodiment.

[0031] like Figure 2 As shown, the switching signal circuit unit includes a power-down sustaining module, a switching module, a voltage regulator and filter module, and a switching signal module. The power-down sustaining module is connected to the voltage regulator and filter module and the switching signal module through the switching module, and the voltage regulator and filter module is connected to the switching signal module. The switching signal module is connected to the thyristor driving circuit unit, and the thyristor driving circuit unit receives the driving signal from the switching signal module to drive the circuit. The power-down sustaining module includes a capacitor sustaining unit, which sustains discharge after the circuit is powered down.

[0032] The capacitor maintenance unit includes a single capacitor or a group of capacitors. In this embodiment, a single capacitor is used as an example; in this embodiment, the capacitor maintenance unit is capacitor C1.

[0033] like Figure 2 As shown, the power-down sustaining module also includes a diode D1; the positive terminal of the diode D1 is connected to the power supply, the negative terminal of the diode D1 is connected to the capacitor sustaining unit and the switching module, and the other end of the capacitor sustaining unit is connected to the ground terminal AGND of the driving circuit.

[0034] Specifically, the anode of diode D1 is connected to a +12V power supply, the cathode of diode D1 is connected to one end of capacitor C1, and the other end of capacitor C1 is connected to the ground terminal AGND of the drive circuit. The cathode of diode D1 is also connected to switch SW1 of the switching module.

[0035] After the drive circuit is powered on, the A+12V power supply charges the capacitor C1 through the diode D1, and simultaneously provides 12V power to the entire drive circuit for triggering subsequent circuits. Meanwhile, with switch SW1 open, all subsequent circuits can remain in standby mode without power, waiting for a subsequent trigger signal to operate.

[0036] After power is cut off, the voltage on capacitor C1 can be latched and maintained due to the action of diode D1, and slowly decays over time. For example, if the voltage here remains above 10V for a short time, the driving capability can be maintained for up to 5 seconds.

[0037] like Figure 2 As shown, the voltage stabilizing and filtering module includes inductor L3, resistor R12, resistor R9, resistor R10, capacitor C10, capacitor C11, capacitor C12, capacitor C13, and Zener diode ZD1.

[0038] The inductor L3 and the resistor R12 are connected in series. The resistor R10, the capacitor C11, the capacitor C12 and the capacitor C13 are connected in parallel and connected to the inductor L3 and the resistor R12. The resistor R9, the capacitor C10 and the Zener diode ZD1 are directly connected in parallel and connected to the inductor L3 and the resistor R12.

[0039] The switching signal module includes a resistor R11 and a transistor Q5; the base of the transistor Q5 is connected to the resistor R11, and the other end of the resistor R11 is connected to the Zener diode ZD1; the collector of the transistor Q5 is externally connected to the drive signal CF_controls, and the emitter of the transistor Q5 is connected to the thyristor drive circuit unit. The transistor Q5 is an NPN transistor.

[0040] When the switch SW1 is closed, the current flows through the inductor L3, the resistor R12, the Zener diode ZD1, and the resistor R11 to the transistor Q5, driving the transistor Q5 to conduct. After the transistor Q5 conducts, the external drive signal CF_controls will be pulled low, thereby driving the subsequent circuit to work.

[0041] In this embodiment, the operation of the switch signal circuit unit includes: when the switch SW1 is closed, if the drive circuit is suddenly de-energized, the electrical energy stored in the capacitor C1 passes through the inductor L3 and the resistor R12, and then through the resistors R10 and R12 using the principle of voltage division to suppress interference such as static electricity; the resistor R10 also serves as a partial discharge mechanism, and if there is static electricity or other interference at the interface, the instantaneous trigger voltage can be stabilized through the resistor R10. Then, the current passes through the three-electrode capacitor filter circuit composed of capacitors C11, C12, and C13, triggering the Zener diode ZD1. If the trigger voltage is an effective voltage (the magnitude of the effective voltage can be set according to the voltage regulator model of Zener diode ZD1), Zener diode ZD1 breaks down and conducts, and the current reaches the capacitor C10. After being filtered by capacitor C10, the current flows through resistor R11 (which is the base protection resistor for the transistor) to the base of transistor Q5, driving transistor Q5 to conduct. Resistor R9 provides a stable voltage level, ensuring that transistor Q5 is normally in the off state.

[0042] In this embodiment, the switching signal circuit unit has strong anti-interference capability, which can effectively prevent interface mis-triggering. After power failure, it can have driving capability for a short time. The holding time of the driving capability after power failure can be extended by adjusting the capacitance of capacitor C1 as needed.

[0043] Figure 3 This is a schematic diagram of the circuit structure of the thyristor drive circuit unit provided in this embodiment.

[0044] like Figure 3 As shown, in this embodiment, the thyristor driving circuit unit includes at least two driving circuit sub-units. The driving circuit sub-units have the same structure, and the number of driving circuit sub-units is the same as the number of driving signals. The driving circuit sub-units are all connected to the switching signal circuit unit, and the number of switching signal circuit units is the same as the number of driving circuit sub-units.

[0045] In this embodiment, the driving circuit subunit is described as two paths, wherein the driving input signal of the first driving circuit subunit is CF_controls and the driving input signal of the second driving circuit subunit is CH_controls.

[0046] This embodiment uses the first driving circuit subunit as an example for explanation.

[0047] like Figure 3 As shown, the driving circuit subunit includes a capacitor sustaining module, a switch driving module, and a thyristor gate module; the capacitor sustaining module is connected to the switch driving module and the thyristor gate module, the switch driving module is connected to the thyristor gate module, and the thyristor gate module receives signals from the switch driving module for driving.

[0048] The capacitor sustaining module includes a diode D3, a capacitor C3, a resistor R3, and a capacitor C7. The positive terminal of the diode D3 is connected to an external A+12V power supply, and the negative terminal of the diode D3 is connected to one end of the resistor R3. The capacitor C3 is connected to the negative terminal of the diode D3, and the other end of the capacitor C3 is connected to the ground terminal AGND of the driving circuit. One end of the capacitor C7 is connected to the other end of the resistor R3, and the other end of the capacitor C7 is connected to the ground terminal AGND of the driving circuit. The external power supply charges the capacitor C7 after passing through the diode D3, the capacitor C3, and the resistor R3.

[0049] The switch driving module includes a resistor R6, a switch Q3, a switch Q4, and a resistor R2. One end of the resistor R2 is connected to a drive signal, and the other end of the resistor R2 is connected to the switch Q3 and the switch Q4. The gate of the switch Q4 is connected to the drive signal through the resistor R2, and the gate of the switch Q3 is also connected to the drive signal through the resistor R2. The gates of both the switch Q4 and the switch Q3 are connected to the capacitor sustaining module through the resistor R6. The drains of both the switch Q4 and the switch Q3 are connected to the thyristor gate module.

[0050] The switching levels of the switching transistor Q4 and the switching transistor Q3 are opposite.

[0051] Specifically, in this embodiment, the switch Q3 is an NMOS transistor and the switch Q4 is a PMOS transistor.

[0052] The gate of the switching transistor Q3 receives the drive input signal CF_controls, the source of the switching transistor Q3 is connected to the ground terminal AGND of the drive circuit, and the drain of the switching transistor Q3 is connected to the thyristor gate module; the gate of the switching transistor Q4 receives the drive input signal CF_controls, the source of the switching transistor Q4 is connected to the A+12V power supply, and the drain of the switching transistor Q3 is connected to the thyristor gate module.

[0053] The switch driving module further includes a capacitor C8, a resistor R8, and a diode D6. One end of the capacitor C8 is connected to the ground terminal AGND of the driving circuit, and the other end is connected to the drain of the switching transistor Q4 and the drain node of the switching transistor Q3; one end of the resistor R8 is connected to the ground terminal AGND of the driving circuit, and the other end is connected to the drain of the switching transistor Q4 and the drain node of the switching transistor Q3; the anode of the diode D6 is connected to the ground terminal AGND of the driving circuit, and the cathode is connected to the drain of the switching transistor Q4 and the drain node of the switching transistor Q3.

[0054] Specifically, in this embodiment, when the circuit is powered on, the A+12V power supply, after passing through diode D3, is filtered by capacitor C3 and resistor R3 before charging capacitor C7. Simultaneously, a stable high level is supplied to switching transistors Q4 and Q3 through resistor R6, triggering Q3 to conduct and Q4 to turn off. Switch Q3 outputs a low-level signal, preventing the thyristor gate module from being triggered. When a trigger signal is received, the drive input signal CF_controls is pulled low. The gates of switching transistors Q4 and Q3 are directly pulled low by the drive input signal CF_controls, turning Q4 on and Q3 off. Switch Q4 outputs a high level, driving the thyristor gate module.

[0055] After power failure, the voltage on capacitor C7 is latched due to the reverse cutoff of diode D3. Under normal conditions, switch Q3 is still driven by the voltage of capacitor C7, causing switch Q3 to conduct while switch Q4 is turned off. Switch Q3 outputs a low-level signal, preventing the thyristor gate module from being triggered. When a trigger signal is received, the drive input signal CF_controls is pulled low. The gates of both switch Q4 and switch Q3 are directly pulled low by the drive input signal CF_controls, causing switch Q4 to conduct while switch Q3 is turned off. At this time, switch Q4 conducts and outputs the voltage stored in capacitor C7, driving the thyristor gate module.

[0056] The receiving end of the driving circuit provided in this embodiment can be driven by a low-level signal with a small current, and converted into a high-level signal with high energy. It has level conversion function and trigger signal energy amplification function. At the same time, it has driving capability (for a short time) after power failure. The retention time of the driving capability after power failure can be extended by adjusting the capacitance of the capacitor C1 as needed.

[0057] Figure 4 This is a schematic diagram of the circuit structure of the thyristor and its external load circuit provided in this embodiment.

[0058] like Figure 4 As shown, the driving circuit also includes a thyristor and its external load circuit. The thyristor and its external load circuit are connected to the thyristor driving circuit unit and receive the driving signal from the thyristor driving circuit unit.

[0059] The thyristor and its external load circuit include thyristor D4, energy storage capacitor C4, and coil L1. Pins 1 and 2 of thyristor D4 are connected in series with energy storage capacitor C4 and coil L1, respectively. Pins 1 and 2 of thyristor D4 are also connected to the thyristor gate module.

[0060] Under normal conditions, pins 1 and 2 of the thyristor D4 are open circuits, and the energy storage capacitor C4 carries high-voltage energy. After pin 4 of the thyristor gate module is driven by a high level, pins 1 and 2 of the thyristor D4 are in a conducting state. The energy on the energy storage capacitor C4 is discharged through the coil L1, and at the same time, the coil L1 generates a magnetic field to drive the external solenoid valve.

[0061] The drive circuit provided in this application, which maintains driving capability after power failure, incorporates a power-down sustaining module in both the switching signal circuit unit and the thyristor drive circuit unit. When power is lost, the module provides power, ensuring the drive circuit retains its driving capability for up to 5 seconds after power failure. It can also be used in conjunction with external device signals or manual switches to maintain driving capability after power loss.

[0062] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0063] The driving circuit that maintains driving capability after power failure provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A drive circuit that maintains driving capability after power failure, characterized in that, The driving circuit includes a switching signal circuit unit and a thyristor driving circuit unit; the switching signal circuit unit is a signal triggering circuit that provides a trigger driving signal to the thyristor driving circuit unit. The switching signal circuit unit includes a power-down sustaining module, a switching module, a voltage regulator and filter module, and a switching signal module; the power-down sustaining module is connected to the voltage regulator and filter module and the switching signal module through the switching module, and the voltage regulator and filter module is connected to the switching signal module; the switching signal module is connected to the thyristor driving circuit unit, and the thyristor driving circuit unit receives the driving signal from the switching signal module to drive the circuit; The power-down sustaining module includes a capacitor sustaining unit, which sustains discharge after the circuit is powered down.

2. The drive circuit according to claim 1, wherein The capacitor maintenance unit includes a single capacitor or a group of capacitors.

3. The drive circuit according to claim 2, wherein The power-down sustaining module also includes a diode D1; the positive terminal of the diode D1 is connected to the power supply, the negative terminal of the diode D1 is connected to the capacitor sustaining unit and the switching module, and the other end of the capacitor sustaining unit is connected to the ground terminal AGND of the driving circuit.

4. The drive circuit according to claim 3, wherein The voltage stabilizing and filtering module includes inductor L3, resistor R12, resistor R9, resistor R10, capacitor C10, capacitor C11, capacitor C12, capacitor C13, and Zener diode ZD1. The inductor L3 and the resistor R12 are connected in series. The resistor R10, the capacitor C11, the capacitor C12 and the capacitor C13 are connected in parallel and connected to the inductor L3 and the resistor R12. The resistor R9, the capacitor C10 and the Zener diode ZD1 are directly connected in parallel and connected to the inductor L3 and the resistor R12.

5. The drive circuit according to claim 4, wherein The switching signal module includes a resistor R11 and a transistor Q5; the base of the transistor Q5 is connected to the resistor R11, and the other end of the resistor R11 is connected to the Zener diode ZD1; the collector of the transistor Q5 is externally connected to a drive signal, and the emitter of the transistor Q5 is connected to the thyristor drive circuit unit.

6. The drive circuit that maintains driving capability after power failure according to claim 1, characterized in that, The thyristor driving circuit unit includes at least two driving circuit sub-units. The driving circuit sub-units have the same structure, and the number of driving circuit sub-units is the same as the number of driving signals. The driving circuit sub-units are all connected to the switching signal circuit unit, and the number of switching signal circuit units is the same as the number of driving circuit sub-units.

7. The drive circuit that maintains driving capability after power failure according to claim 6, characterized in that, The driving circuit subunit includes a capacitor sustaining module, a switch driving module, and a thyristor gate module; the capacitor sustaining module is connected to the switch driving module and the thyristor gate module, the switch driving module is connected to the thyristor gate module, and the thyristor gate module receives signals from the switch driving module for driving.

8. The drive circuit that maintains driving capability after power failure according to claim 7, characterized in that, The capacitor sustaining module includes a diode D3, a capacitor C3, a resistor R3, and a capacitor C7. The positive terminal of the diode D3 is connected to an external power supply, and the negative terminal of the diode D3 is connected to one end of the resistor R3. The capacitor C3 is connected to the negative terminal of the diode D3, and the other end of the capacitor C3 is connected to the ground terminal AGND of the driving circuit. One end of the capacitor C7 is connected to the other end of the resistor R3, and the other end of the capacitor C7 is connected to the ground terminal AGND of the driving circuit. The external power supply charges the capacitor C7 after passing through the diode D3, the capacitor C3, and the resistor R3.

9. The drive circuit that maintains driving capability after power failure according to claim 8, characterized in that, The switch driving module includes a resistor R6, a switch Q3, a switch Q4, and a resistor R2. One end of the resistor R2 is connected to a drive signal, and the other end of the resistor R2 is connected to the switch Q3 and the switch Q4. The gate of the switch Q4 is connected to the drive signal through the resistor R2, and the gate of the switch Q3 is also connected to the drive signal through the resistor R2. The gates of both the switch Q4 and the switch Q3 are connected to the capacitor sustaining module through the resistor R6. The drains of both the switch Q4 and the switch Q3 are connected to the thyristor gate module. The switching levels of the switching transistor Q4 and the switching transistor Q3 are opposite.

10. The drive circuit that maintains driving capability after power failure according to claim 1, characterized in that, The driving circuit also includes a thyristor and its external load circuit unit, which is connected to the thyristor driving circuit unit and receives the driving signal from the thyristor driving circuit unit.

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