Current mode thyristor drive circuit

Abstract

The application discloses a current mode thyristor driving circuit, which comprises an independent driving type push-pull triode circuit, an eighth resistor, a first MOS tube, a transformer and a fifth resistor; one end of the eighth resistor is connected with a control output end of the independent driving type push-pull triode circuit, and the other end of the eighth resistor is connected with a gate of the first MOS tube; a drain of the first MOS tube is connected with one end of a primary winding of the transformer, and a source of the first MOS tube is grounded; the other end of the primary winding of the transformer is connected with a power supply; one end of a secondary winding of the transformer is connected with one end of the fifth resistor and a gate of the thyristor, and the other end of the secondary winding of the transformer is connected with the other end of the fifth resistor and a cathode of the thyristor. The driving circuit uses the input differential signal with opposite high and low levels to adjust the opening time of the MOS tube and obtain different peak currents, thereby improving the flexibility and practicability of the driving circuit, avoiding additional power loss and reducing heat generation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of driving circuit, in particular to a current mode thyristor driving circuit. BACKGROUND

[0002] The common thyristor driving circuit is usually an optical coupling isolation voltage type driving circuit, but the driving circuit has some deficiencies in the application process; for example, the conventional driving circuit is greatly affected by power supply voltage fluctuation, when the power supply voltage is unstable, the amplitude of the trigger signal may change, affecting the triggering reliability of the thyristor; at the same time, there may be a large voltage drop on the current limiting resistor of the conventional driving circuit, resulting in unnecessary power loss. Therefore, the voltage type driving circuit of the prior art is greatly affected by the power supply voltage, and large power loss is easily generated, thereby the problem of poor driving control reliability exists. SUMMARY

[0003] The embodiment of the present application provides a current mode thyristor driving circuit, which aims to solve the problem of poor driving control reliability existing in the voltage type driving circuit of the prior art.

[0004] The embodiment of the present application discloses a current mode thyristor driving circuit, which comprises an independent driving type push-pull triode circuit, an eighth resistor, a first MOS tube, a transformer and a fifth resistor.

[0005] One end of the eighth resistor is connected to the control output end of the independent driving type push-pull triode circuit, and the other end of the eighth resistor is connected to the gate of the first MOS tube; the drain of the first MOS tube is connected to one end of the primary winding of the transformer, and the source of the first MOS tube is grounded; the other end of the primary winding of the transformer is connected to a power supply.

[0006] One end of the fifth resistor and the gate of a thyristor are connected to one end of the secondary winding of the transformer, and the other end of the fifth resistor and the cathode of the thyristor are connected to the other end of the secondary winding of the transformer.

[0007] Two signal input ends of the independent driving type push-pull triode circuit are used for inputting differential signals with opposite high and low levels, and a power supply end of the independent driving type push-pull triode circuit is connected to the power supply; and a grounding end of the independent driving type push-pull triode circuit is grounded.

[0008] The current mode thyristor driving circuit comprises a first triode circuit and a second triode circuit.

[0009] The first power supply end and the second power supply end of the first transistor circuit are electrically connected with the power supply, and the input end of the first transistor circuit is a signal input end of the independent driving type push-pull transistor circuit; the output end of the first transistor circuit is connected with the output end of the second transistor circuit, and the connecting point is a control output end of the independent driving type push-pull transistor circuit;

[0010] The input end of the second transistor circuit is another signal input end of the independent driving type push-pull transistor circuit; the ground connection end of the second transistor circuit is connected with the ground connection end of the first transistor circuit, and the connecting point is a ground end of the independent driving type push-pull transistor circuit.

[0011] The current type thyristor drive circuit, wherein the first transistor circuit comprises a seventh resistor, a first resistor, a first transistor and a second transistor;

[0012] One end of the seventh resistor is connected with the base of the second transistor, and the connecting point is an input end of the first transistor circuit; the other end of the seventh resistor is connected with the emitter of the second transistor, and the connecting point is a ground connection end of the first transistor circuit;

[0013] The collector of the second transistor is connected with one end of the first resistor and the base of the first transistor; the other end of the first resistor is a first power supply end of the first transistor circuit;

[0014] The collector of the first transistor is an output end of the first transistor circuit; and the emitter of the first transistor is a second power supply end of the first transistor circuit.

[0015] The current type thyristor drive circuit, wherein the first transistor circuit further comprises a sixth resistor and a third resistor;

[0016] One end of the sixth resistor is connected with one end of the seventh resistor and the base of the second transistor; and the other end of the sixth resistor is an input end of the first transistor circuit;

[0017] One end of the third resistor is connected with one end of the first resistor and the collector of the second transistor, and the other end of the third resistor is connected with the base of the first transistor.

[0018] The current type thyristor drive circuit, wherein the second transistor circuit comprises an eleventh resistor and a third transistor;

[0019] One end of the eleventh resistor is connected to the base of the third triode, and the connecting point is used as the input terminal of the second triode circuit; the other end of the eleventh resistor is connected to the emitter of the third triode, and the connecting point is used as the ground connection terminal of the second triode circuit; the collector of the third triode is used as the output terminal of the second triode circuit.

[0020] The current-mode thyristor driving circuit, wherein the second triode circuit further comprises a tenth resistor, one end of the tenth resistor is connected to one end of the eleventh resistor and the base of the third triode, and the other end of the tenth resistor is used as the input terminal of the second triode circuit.

[0021] The current-mode thyristor driving circuit, wherein the current-mode thyristor driving circuit further comprises a second diode, a second resistor and a first capacitor.

[0022] The anode of the second diode is connected to the drain of the first MOS tube and one end of the primary winding of the transformer; the cathode of the second diode is connected to one end of the second resistor and one end of the first capacitor; the other end of the first capacitor is connected to the other end of the second resistor and the other end of the primary winding of the transformer.

[0023] The current-mode thyristor driving circuit, wherein the current-mode thyristor driving circuit further comprises a fourth resistor, a second capacitor and a third capacitor.

[0024] One end of the second capacitor is connected to one end of the secondary winding of the transformer, one end of the fifth resistor and one end of the third capacitor; the other end of the second capacitor is connected to one end of the fourth resistor; the other end of the fourth resistor is connected to the other end of the secondary winding of the transformer, the other end of the fifth resistor and the other end of the third capacitor.

[0025] The current-mode thyristor driving circuit, wherein the current-mode thyristor driving circuit further comprises a first diode.

[0026] The anode of the first diode is connected to the other end of the fourth resistor, and the cathode of the first diode is connected to the other end of the fifth resistor and the other end of the third capacitor.

[0027] The current-mode thyristor driving circuit, wherein the current-mode thyristor driving circuit further comprises a ninth resistor.

[0028] One end of the ninth resistor is connected to the gate of the first MOS tube, and the other end of the ninth resistor is connected to the source of the first MOS tube.

[0029] The embodiment of the present application discloses a current mode thyristor drive circuit, which comprises an independent drive type push-pull triode circuit, an eighth resistor, a first MOS tube, a transformer and a fifth resistor; one end of the eighth resistor is connected to the control output end of the independent drive type push-pull triode circuit, and the other end of the eighth resistor is connected to the gate of the first MOS tube; the drain of the first MOS tube is connected to one end of the primary winding of the transformer, and the source of the first MOS tube is grounded; the other end of the primary winding of the transformer is connected to a power supply; one end of the secondary winding of the transformer is connected to one end of the fifth resistor and the gate of the thyristor, and the other end of the secondary winding of the transformer is connected to the other end of the fifth resistor and the cathode of the thyristor. The above-mentioned drive circuit uses the input differential signal with opposite high and low levels and outputs a conduction control signal to adjust the opening time of the MOS tube and obtain different peak currents, thereby improving the flexibility and practicability of the drive circuit, avoiding unnecessary power loss and reducing the heating of the board. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The circuit structure diagram of the current mode thyristor drive circuit provided by the embodiment of the present application is shown in the figure.

[0032] The drawings are as follows: S1, first triode circuit; S2, second triode circuit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; Q1, first triode; Q2, second triode; Q3, third triode; M1, first MOS tube; D1, first diode; D2, second diode; T1, transformer; C1, first capacitor; C2, second capacitor; C3, third capacitor. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0034] It should be understood that the terms "comprises" and "comprising," when used in this specification and the following claims, indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0035] It should also be understood that the terms used in the specification and the following claims are intended to describe particular embodiments and do not intend to limit the present application. As used in the specification and the following claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should be further understood that the term "and / or" used in the specification and the following claims indicates one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0037] The embodiment of the present application discloses a current mode thyristor driving circuit, which comprises an independent driving push-pull triode circuit, an eighth resistor R8, a first MOS tube M1, a transformer T1 and a fifth resistor R5; one end of the eighth resistor R8 is connected to the control output end of the independent driving push-pull triode circuit, and the other end of the eighth resistor R8 is connected to the gate of the first MOS tube M1; one end of the primary winding of the transformer T1 is connected to the drain of the first MOS tube M1, and the source of the first MOS tube M1 is grounded; the other end of the primary winding of the transformer T1 is connected to a power supply; one end of the secondary winding of the transformer T1 is connected to one end of the fifth resistor R5 and the gate of a thyristor, and the other end of the secondary winding of the transformer T1 is connected to the other end of the fifth resistor R5 and the cathode of the thyristor; two signal input ends of the independent driving push-pull triode circuit are used for inputting differential signals with opposite high and low levels, a power supply end of the independent driving push-pull triode circuit is connected to the power supply, and a grounding end of the independent driving push-pull triode circuit is grounded.

[0038] The current mode thyristor driving circuit is used for driving and controlling the thyristor, wherein the gate of the thyristor is T_G in Figure 1 , the cathode of the thyristor is T_K in Figure 1 , the secondary winding of the transformer T1 is connected to the gate of the thyristor, the primary winding of the transformer T1 is arranged in series between the drain of the first MOS tube M1 and the power supply, and the voltage of the power supply is +15V. The front stage of the first MOS tube M1 is the independent driving push-pull triode circuit, which is used for controlling the turn-on and turn-off of the first MOS tube M1.

[0039] In a more specific embodiment, the independent drive type push-pull triode circuit comprises a first triode Q1 circuit S1 and a second triode Q2 circuit S2; the first power supply end and the second power supply end of the first triode Q1 circuit S1 are electrically connected with the power supply, the input end of the first triode Q1 circuit S1 serves as one signal input end of the independent drive type push-pull triode circuit; the output end of the first triode Q1 circuit S1 is connected with the output end of the second triode Q2 circuit S2, and the connection point serves as a control output end of the independent drive type push-pull triode circuit; the input end of the second triode Q2 circuit S2 serves as another signal input end of the independent drive type push-pull triode circuit; the ground connection end of the second triode Q2 circuit S2 is connected with the ground connection end of the first triode Q1 circuit S1, and the connection point serves as a ground end of the independent drive type push-pull triode circuit.

[0040] Specifically, the independent drive type push-pull triode circuit is composed of a first triode Q1 circuit S1 and a second triode Q2 circuit S2. The first power supply end and the second power supply end of the first triode Q1 circuit S1 are electrically connected with the power supply.

[0041] The input end of the first triode Q1 circuit S1 and the input end of the second triode Q2 circuit S2 respectively serve as two signal input ends (such as the PWMA and PWMB ports in FIG. 1) of the independent drive type push-pull triode circuit; the two signal input ends are used for inputting differential signals with opposite high and low levels, so as to realize on-off control of the first MOS tube M1 and finally realize drive control of the thyristor. Figure 1

[0042] ​Specifically, the first transistor Q1 circuit S1 includes a seventh resistor R7, a first resistor R1, a first transistor Q1 and a second transistor Q2; one end of the seventh resistor R7 is connected to the base of the second transistor Q2, and the connection point serves as the input terminal of the first transistor Q1 circuit S1; the other end of the seventh resistor R7 is connected to the emitter of the second transistor Q2, and the connection point serves as the ground connection terminal of the first transistor Q1 circuit S1; the collector of the second transistor Q2 is connected to one end of the first resistor R1 and the base of the first transistor Q1; the other end of the first resistor R1 serves as the first power supply terminal of the first transistor Q1 circuit S1; the collector of the first transistor Q1 serves as the output terminal of the first transistor Q1 circuit S1; the emitter of the first transistor Q1 serves as the second power supply terminal of the first transistor Q1 circuit S1. Wherein, the first transistor Q1 circuit S1 further includes a sixth resistor R6 and a third resistor R3; one end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the base of the second transistor Q2; the other end of the sixth resistor R6 serves as the input terminal of the first transistor Q1 circuit S1; one end of the third resistor R3 is connected to one end of the first resistor R1 and the collector of the second transistor Q2, and the other end of the third resistor R3 is connected to the base of the first transistor Q1.

[0043] More specifically, the second transistor Q2 circuit S2 includes an eleventh resistor R11 and a third transistor Q3; one end of the eleventh resistor R11 is connected to the base of the third transistor Q3, and the connection point serves as the input terminal of the second transistor Q2 circuit S2; the other end of the eleventh resistor R11 is connected to the emitter of the third transistor Q3, and the connection point serves as the ground connection terminal of the second transistor Q2 circuit S2; the collector of the third transistor Q3 serves as the output terminal of the second transistor Q2 circuit S2. Wherein, the second transistor Q2 circuit S2 further includes a tenth resistor R10, one end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and the base of the third transistor Q3, and the other end of the tenth resistor R10 serves as the input terminal of the second transistor Q2 circuit S2.

[0044] The seventh resistor R7 and the eleventh resistor R11 are pull-down resistors, which ensure that the second transistor Q2 and the third transistor Q3 are in the off state when no driving signal is input. When initially powered on, the PWMB signal input end is set to input a high level, and the PWMA signal input end is set to input a low level, so that the base (B electrode) of the third transistor Q3 is at a high level at this time. The third transistor Q3 is turned on, the gate (G electrode) of the first MOS tube M1 is at a low level, the first MOS tube M1 remains in the off state, the primary side of the transformer T1 does not store energy, the secondary side winding has no energy release, and the thyristor cannot be opened and remains in a safe off state. When the PWMA signal input end inputs a high level and the PWMB signal input end inputs a low level, the emitter and the collector (CE electrode) of the second transistor Q2 are turned on, so that the base (B electrode) of the first transistor Q1 is at a low level, and the emitter and the collector (CE electrode) of the first transistor Q1 are turned on. At this time, the emitter and the collector (CE electrode) of the third transistor Q3 are disconnected, the gate (G electrode) of the first MOS tube M1 is pulled high, the source and the drain (DS) of the first MOS tube M1 are connected, so that by reasonably controlling the high and low levels of the two signal input ends of the PWMA and the PWMB, the conduction and the off of the first MOS tube M1 can be controlled.

[0045] The transformer T1 can be a flyback transformer T1, and the voltage of the power supply connected to the primary side winding of the flyback transformer T1 is +15V. When the first MOS tube M1 is turned on, the current of the primary side winding of the transformer T1 linearly rises, the primary side winding stores energy, and when it is turned off, the secondary side winding releases energy to the gate of the thyristor. The current of the secondary side of the transformer T1 rapidly rises to a peak value and then linearly decreases. Only the peak current of the secondary side reaches the current threshold of the gate of the thyristor, and the thyristor can be reliably turned on. For example, the switching frequency of the first MOS tube M1 used in the embodiment is 10KHz, and the switching period is 100us (1 / 10KHz). The primary side inductance of the transformer T1 is 600uH, the secondary side inductance is 150uH, and the primary and secondary side turns ratio is 2. When the first MOS tube M1 is turned on for 20us, the peak current Ip of the primary side is 15Vx20us / 600uH=0.5A, and the peak current of the secondary side can reach 0.5x2=1A, which can ensure that the thyristor is reliably turned on. In actual application process, the turn-on time of the first MOS tube M1 can be adjusted to obtain different peak currents, which has higher flexibility and practicality, and at the same time avoids unnecessary power loss and reduces the heating of the board. If it is applied to three-phase alternating current, three groups of current type thyristor driving circuits can be set at the same time, that is, the RST three-phase hardware driving circuits in the three-phase alternating current are the same.

[0046] In a more specific embodiment, the current mode thyristor drive circuit further comprises a second diode D2, a second resistor R2 and a first capacitor C1; the positive electrode of the second diode D2 is connected to the drain of the first MOS tube M1 and one end of the primary winding of the transformer T1; the negative electrode of the second diode D2 is connected to one end of the second resistor R2 and one end of the first capacitor C1; the other end of the first capacitor C1 is connected to the other end of the second resistor R2 and the other end of the primary winding of the transformer T1. Specifically, the current mode thyristor drive circuit further comprises a fourth resistor R4, a second capacitor C2 and a third capacitor C3; one end of the second capacitor C2 is connected to one end of the secondary winding of the transformer T1, one end of the fifth resistor R5 and one end of the third capacitor C3; the other end of the second capacitor C2 is connected to one end of the fourth resistor R4; the other end of the fourth resistor R4 is connected to the other end of the secondary winding of the transformer T1, the other end of the fifth resistor R5 and the other end of the third capacitor C3. Wherein, the current mode thyristor drive circuit further comprises a first diode D1; the positive electrode of the first diode D1 is connected to the other end of the fourth resistor R4, and the negative electrode of the first diode D1 is connected to the other end of the fifth resistor R5 and the other end of the third capacitor C3.

[0047] The second diode D2, the second resistor R2 and the first capacitor C1 can be provided to form a primary power consumption circuit; the second diode D2 defines the current conduction direction of the primary winding side of the transformer T1, and the second resistor R2 is used to slowly consume the current flowing through, so as to realize the linear rise and fall of the current of the primary winding and improve the stability of the drive control process.

[0048] In order to realize the protection of the secondary winding of the transformer T1 and improve the reliability of the drive control of the thyristor, the fourth resistor R4, the second capacitor C2 and the third capacitor C3 can be provided on the side of the secondary winding, and corresponding components are provided to improve the isolation degree between the two ends of the secondary winding, thereby improving the stability of the drive control of the thyristor.

[0049] Further, the first diode D1 can be connected in series between the other end of the fourth resistor R4 and the other end of the fifth resistor R5, so that the first diode D1 can define the one-way conduction of the signal output to the gate of the thyristor, thereby improving the reliability of the drive control.

[0050] In a more specific embodiment, the current mode thyristor drive circuit further comprises a ninth resistor R9; one end of the ninth resistor R9 is connected to the gate of the first MOS tube M1, and the other end of the ninth resistor R9 is connected to the source of the first MOS tube M1.

[0051] The ninth resistor R9 can be arranged in series between the gate and the source of the first MOS transistor M1, and the ninth resistor R9 can be used as a pull-down resistor to ensure that the first MOS transistor M1 is in an off state when no driving signal is input, thereby improving the stability and reliability of the driving control.

[0052] The application discloses a current-mode thyristor driving circuit, which comprises an independent driving push-pull triode circuit, an eighth resistor, a first MOS transistor, a transformer and a fifth resistor. The control output end of the independent driving push-pull triode circuit is connected with one end of the eighth resistor, and the other end of the eighth resistor is connected with the gate of the first MOS transistor. The drain of the first MOS transistor is connected with one end of the primary winding of the transformer, and the source of the first MOS transistor is grounded. The other end of the primary winding of the transformer is connected with a power supply. One end of the secondary winding of the transformer is connected with one end of the fifth resistor and the gate of the thyristor, and the other end of the secondary winding of the transformer is connected with the other end of the fifth resistor and the cathode of the thyristor. The driving circuit uses the input differential signal with opposite high and low levels to output a conduction control signal, so that the opening time of the MOS transistor is adjusted and different peak currents are obtained, the flexibility and practicability of the driving circuit are improved, unnecessary power loss is avoided, and the heat generation of the board is reduced.

[0053] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the application, and these modifications or replacements should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A current mode thyristor drive circuit, characterized by The current mode thyristor drive circuit comprises an independent drive type push-pull triode circuit, an eighth resistor, a first MOS tube, a transformer and a fifth resistor; One end of the control output end of the independent drive type push-pull triode circuit is connected with one end of the eighth resistor, and the other end of the eighth resistor is connected with the gate of the first MOS tube; the drain of the first MOS tube is connected with one end of the primary winding of the transformer, and the source of the first MOS tube is grounded; The other end of the primary winding of the transformer is connected with a power supply; One end of the secondary winding of the transformer is connected with one end of the fifth resistor and the gate of the thyristor, and the other end of the secondary winding of the transformer is connected with the other end of the fifth resistor and the cathode of the thyristor; The two signal input ends of the independent drive type push-pull triode circuit are used for inputting differential signals with opposite high and low levels, and the power supply end of the independent drive type push-pull triode circuit is connected with the power supply; The ground connection end of the independent drive type push-pull triode circuit is grounded.

2. The current-mode thyristor drive circuit of claim 1, wherein, The independent drive type push-pull triode circuit comprises a first triode circuit and a second triode circuit; The first power supply end and the second power supply end of the first triode circuit are electrically connected with the power supply, the input end of the first triode circuit serves as one signal input end of the independent drive type push-pull triode circuit, the output end of the first triode circuit is connected with the output end of the second triode circuit, and the connection point serves as a control output end of the independent drive type push-pull triode circuit; The input end of the second triode circuit serves as another signal input end of the independent drive type push-pull triode circuit, and the ground connection end of the second triode circuit is connected with the ground connection end of the first triode circuit, and the connection point serves as a ground end of the independent drive type push-pull triode circuit.

3. The current-mode thyristor drive circuit of claim 2, wherein, The first triode circuit comprises a seventh resistor, a first resistor, a first triode and a second triode; One end of the seventh resistor is connected with the base of the second triode, and the connection point serves as an input end of the first triode circuit; the other end of the seventh resistor is connected with the emitter of the second triode, and the connection point serves as a ground connection end of the first triode circuit; The collector of the second triode is connected with one end of the first resistor and the base of the first triode; the other end of the first resistor serves as a first power supply end of the first triode circuit; The collector of the first triode serves as an output end of the first triode circuit, and the emitter of the first triode serves as a second power supply end of the first triode circuit.

4. The current-mode thyristor drive circuit of claim 3, wherein, The first triode circuit further comprises a sixth resistor and a third resistor; One end of the sixth resistor is connected with one end of the seventh resistor and the base of the second triode; the other end of the sixth resistor serves as an input end of the first triode circuit; One end of the third resistor is connected with one end of the first resistor and the collector of the second triode, and the other end of the third resistor is connected with the base of the first triode.

5. The current-mode thyristor drive circuit of claim 2, wherein, The second triode circuit comprises an eleventh resistor and a third triode; One end of the eleventh resistor is connected to the base of the third triode, and the connecting point serves as the input terminal of the second triode circuit; the other end of the eleventh resistor is connected to the emitter of the third triode, and the connecting point serves as the ground connection terminal of the second triode circuit; the collector of the third triode serves as the output terminal of the second triode circuit.

6. The current-mode thyristor drive circuit of claim 5, wherein, The second triode circuit further comprises a tenth resistor, one end of the tenth resistor being connected to one end of the eleventh resistor and the base of the third triode, and the other end of the tenth resistor serving as the input terminal of the second triode circuit.

7. The triac drive circuit according to any one of claims 1 to 6, wherein The current-type thyristor drive circuit further comprises a second diode, a second resistor and a first capacitor; The anode of the second diode is connected to the drain of the first MOS tube and one end of the primary winding of the transformer; the cathode of the second diode is connected to one end of the second resistor and one end of the first capacitor; the other end of the first capacitor is connected to the other end of the second resistor and the other end of the primary winding of the transformer.

8. The current-mode thyristor drive circuit of claim 7, wherein, The current-type thyristor drive circuit further comprises a fourth resistor, a second capacitor and a third capacitor; One end of the second capacitor is connected to one end of the secondary winding of the transformer, one end of the fifth resistor and one end of the third capacitor; the other end of the second capacitor is connected to one end of the fourth resistor; the other end of the fourth resistor is connected to the other end of the secondary winding of the transformer, the other end of the fifth resistor and the other end of the third capacitor.

9. The current-mode thyristor drive circuit of claim 8, wherein, The current-type thyristor drive circuit further comprises a first diode; The anode of the first diode is connected to the other end of the fourth resistor, and the cathode of the first diode is connected to the other end of the fifth resistor and the other end of the third capacitor.

10. The silicon controlled rectifier drive circuit of claim 8, wherein, The current-type thyristor drive circuit further comprises a ninth resistor; One end of the ninth resistor is connected to the gate of the first MOS tube, and the other end of the ninth resistor is connected to the source of the first MOS tube.

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