CN111884638A - Thyristor interlocking control circuit - Google Patents
Thyristor interlocking control circuit Download PDFInfo
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- CN111884638A CN111884638A CN202010644669.XA CN202010644669A CN111884638A CN 111884638 A CN111884638 A CN 111884638A CN 202010644669 A CN202010644669 A CN 202010644669A CN 111884638 A CN111884638 A CN 111884638A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0824—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in thyristor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/785—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling field-effect transistor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/79—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar semiconductor switches with more than two PN-junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
Abstract
The invention discloses a thyristor interlock control circuit, which monitors the voltage at two ends of a thyristor by a photoelectric coupler, the photoelectric coupler adjusts a level signal and outputs the level signal to a photoelectric converter through a collector of a triode, the photoelectric converter sends out a light signal according to the voltage state of the thyristor, a control unit receives the light signal and judges the state of the thyristor and then sends out a control light signal, a photoelectric conversion circuit receives the light signal output by the control unit and converts the light signal into an analog electric signal, a waveform shaping circuit shapes the waveform of the analog electric signal into a square waveform, the waveform shaping circuit provides a driving signal for a push-pull circuit, the push-pull circuit provides a gate driving signal for a field effect transistor, a grid electrode of the field effect transistor is also butted with the ground by a voltage stabilizing tube, a source electrode of the field effect transistor is butted with the ground, the field effect transistor controls the conduction and the turn-off of a, the secondary side of the thyristor trigger transformer controls the on-off of the thyristor.
Description
Technical Field
The present invention relates to the field of thyristor (scr) applications, and more particularly to a device for controlling the on-off state of an event thyristor and controlling a response thyristor.
Background
The thyristor can control a large current of hundreds to thousands of amperes only by using a current of tens to hundreds of milliamperes, so that the control of weak current on strong current is realized. The thyristor is matched with other power electronic devices, and is widely applied to multiple fields of controllable rectification, inversion, motor speed regulation, motor excitation, contactless switching, automatic control and the like.
The thyristor short-circuit fault can be detected quickly and reliably, and the thyristor short-circuit fault detection and the switch on and off of the switch at the stage by using the fault obtained by judgment are urgent needs of the current market.
Disclosure of Invention
The invention aims to provide a thyristor interlock control circuit which can judge whether an event thyristor fails or not by monitoring the state of voltage at two ends of the event thyristor, convert a voltage switching value signal into an optical signal, further convert the optical signal into a digital signal and control the thyristor or a plurality of thyristors to be switched on and off by the digital signal.
In order to solve the above technical problem, the present invention provides a thyristor interlock control circuit, which comprises a thyristor response trigger circuit,
the thyristor response trigger circuit is provided with a photoelectric conversion circuit, a waveform shaping circuit, a push-pull circuit, a current-limiting resistor eight, a voltage-stabilizing tube four, a field-effect tube, a thyristor trigger transformer, a thyristor and a control unit, wherein the photoelectric conversion circuit receives an optical signal output by the control unit and converts the optical signal into an analog electrical signal, the output end of the photoelectric conversion circuit is connected with the input end of the waveform shaping circuit, the waveform shaping circuit shapes the waveform of the analog electrical signal into a square waveform, the output end of the waveform shaping circuit is connected with the input end of the push-pull circuit and provides a driving signal for the push-pull circuit, the output end of the push-pull circuit is connected with the grid electrode of the field-effect tube through the current-limiting resistor eight and provides a gate driving signal for the field-effect tube, the grid electrode of the field-effect tube is also in butt joint with the ground, the diode five is connected with a positive power supply through a first RC parallel circuit, the first RC parallel circuit is also connected with a voltage stabilizing diode six in parallel, the positive electrode and the negative electrode of the voltage stabilizing diode six are respectively butted with the positive power supply and the negative electrode of the diode five, the same-name end of a thyristor trigger transformer is connected in series between the positive power supply and the drain electrode of the field effect tube, the secondary side of the thyristor trigger transformer and the diode DT are connected in series between the control electrode and the negative electrode of the thyristor, the negative electrode of the diode DT is connected with the control electrode of the thyristor, and the positive electrode of the diode DT is connected.
Furthermore, the thyristor interlocking control circuit also comprises a thyristor fault detection circuit which is provided with a photoelectric coupler, a triode I and a photoelectric converter, wherein an input pin of the photoelectric coupler monitors the voltage at the two ends of the cathode and the anode of the thyristor, a first diode is connected between the cathode and the anode of the thyristor in parallel, an output pin of the photoelectric coupler outputs a level signal to a base electrode of a first triode after voltage division adjustment, an emitting electrode of the first triode is grounded, the collector is connected to the pin of the photoelectric converter, so that the photoelectric converter emits optical signals according to the voltage state of the thyristor, the control unit collects optical signals from the photoelectric converter and judges whether the thyristor has a fault or not, and sending an optical signal to the photoelectric conversion circuit according to the fault state to control the turn-off and the turn-on of the thyristor.
Further, the homonymous terminal of at least one group of thyristor trigger transformers is connected between the positive power supply and the positive electrode of the diode V in parallel.
Furthermore, a resistor twelve is connected in series between the dotted terminal of the thyristor trigger transformer and the anode of the diode five, the drain of the field effect transistor is also connected in parallel with an RC series circuit, the other end of the RC series circuit is butted with the ground, a resistor eleven in the RC series circuit is connected in parallel with a diode seven, the anode of the diode seven is connected with the drain of the field effect transistor, and the cathode of the diode seven is connected with a capacitor six in the RC series circuit.
Further, a second RC parallel circuit is connected in series between one end of the resistor twelve, which is far away from the dotted end of the thyristor-triggered transformer, and the anode of the diode five.
Furthermore, a first current limiting resistor is connected in series between the cathode of the first diode and an input pin of the photoelectric coupler.
Furthermore, a second divider resistor is connected in series between an output pin of the photoelectric coupler and the base of the first triode.
Furthermore, one end of the second divider resistor, which is connected with the output pin of the photoelectric coupler, is grounded through a third resistor.
Furthermore, the base electrode of the first triode is grounded through a first capacitor and a fourth resistor.
Further, the photoelectric converter comprises an optical fiber emitter, the cathode of the optical fiber emitter is connected in parallel with a resistor five and a diode two, the other end of the resistor five is connected with the collector of the triode one, and the cathode of the diode two is connected with the anode of the optical fiber emitter through a light emitting diode LED 1.
According to the invention, the thyristor is subjected to half-wave rectification through the diode I, then enters the photoelectric coupler through the current resistor I, is subjected to level conversion through the photoelectric coupler, and then is subjected to voltage division through the resistor to adjust the base input voltage value of the triode I, so that the on and off of the photoelectric converter are controlled by controlling the on and off of the triode I.
The two ends of the thyristor have no voltage when being normally switched on, and the two ends recover the voltage after being normally switched off. When the photoelectric converter is switched on, the thyristor is not switched on, and the thyristor has input, so that the photoelectric converter has light signals to be transmitted. The switch-off is not carried out, the thyristor has no voltage input, and the photoelectric converter has no signal output. Therefore, whether the thyristor fails or not can be judged by monitoring the voltage states at the two ends of the thyristor, the photoelectric converter outputs an optical electrical signal to the control unit for judgment, and the control unit sends out the optical signal to control the conduction and the closing of the thyristor, so that the photoelectric isolation and the optical signal isolation can be realized.
The thyristor response trigger circuit selects HFBR-2412T as an input type optical module, and converts an optical signal into an electric signal by receiving an optical signal input by the control unit. By connecting to the input end of the Schmitt trigger CD40106, the Schmitt trigger can filter noise waves of an input signal and provide driving signals for a second triode and a third triode of a rear-end push-pull circuit. And the second triode and the third triode are symmetrically arranged to form a group of push-pull circuits to improve the driving capability again and provide a gate-level driving signal for the rear-end field effect transistor. The current limiting resistor eight is used for limiting current and the voltage stabilizing tube four is used for providing overvoltage protection.
The on and off of the field effect transistor are controlled through the digital signal, when the field effect transistor is not switched on, no current flows through the same-name end of the thyristor trigger transformer, and the same-name end of the thyristor trigger transformer is in a suspended voltage state and is the voltage of a positive power supply; when the field effect tube is switched on, the current flows through from a positive power supply, the dotted terminal of the thyristor trigger transformer and the field effect, when the field effect tube is switched off, the thyristor trigger transformer generates counter potential, the system voltage can be raised by superposing the counter potential and the positive power supply, the redundant peak can be absorbed by the first RC parallel circuit, in the switching-on and switching-off processes of the field effect tube, the secondary side of the thyristor trigger transformer generates induction current, the secondary side of the thyristor trigger transformer is connected with the control electrode and the cathode of the thyristor, and the light-operated switching-on and switching-off of the thyristor is realized by the electromagnetic conversion mode.
The RC series circuit and the diode seven realize resistance-capacitance absorption protection of the field effect transistor, when the source voltage of the field effect transistor is too high, the diode seven quickly charges the capacitor six in the RC series circuit, and when the field effect transistor is switched on, the diode seven prevents the capacitor seven in the RC series circuit from reversely discharging. And a capacitor seven in the RC series circuit is slowly discharged through a resistor eleven connected in series, so that the capacitor six is prevented from being damaged due to overhigh charge.
The resistor twelve realizes current limiting, the second RC parallel circuit is charged when the field effect tube is switched on, the switching-on circuit of the field effect tube is reduced, and the current is stable when the second RC parallel circuit is not charged any more.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a circuit schematic diagram of a thyristor responsive trigger circuit portion of the thyristor interlock control circuit of the present invention;
FIG. 2 is a schematic diagram of a thyristor response trigger circuit in the thyristor interlock control circuit of the present invention;
FIG. 3 is a schematic circuit diagram of a thyristor fault detection arrangement in the thyristor interlock control circuit of the present invention;
fig. 4 is a block diagram of the thyristor interlock control circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, 2, 3 and 4, a thyristor interlock control circuit includes a thyristor fault detection circuit and a thyristor response trigger circuit,
the thyristor fault detection circuit comprises a first thyristor, a second thyristor, a first diode D1, a photoelectric coupler N1, a first triode Q1, a photoelectric converter 9, a first thyristor and a second thyristor, wherein the anode and the cathode of the first thyristor and the second thyristor are in butt joint with a plug J1, a control electrode G1 and a cathode K1 of the first thyristor are also in butt joint with a plug J3, a control electrode G2 and a cathode K2 of the second thyristor are also in butt joint with a plug J4, a first diode D1 is connected between the positive pin and the negative pin of the plug J1 in series, the anode and the cathode of the first diode D1 are respectively connected to an input terminal pin 2 and a pin 1 of the photoelectric coupler N1, an output terminal 4 of the photoelectric coupler N1 is connected to a base B of the first triode Q1, an emitter E of the first triode Q1 is grounded, and. A current-limiting resistor I R1 is also connected in series between the cathode of the diode I D1 and the input pin 1 of the photocoupler N1, a voltage-dividing resistor II R2 is connected in series between the output pin 4 of the photocoupler N1 and the base B of the triode I Q1, one end of the voltage-dividing resistor II R2 connected with the output pin 1 of the photocoupler N1 is also grounded through a resistor III R3, the base B of the triode I Q1 is also grounded through a capacitor I C1 and a resistor IV R4, the photoelectric converter 9 comprises an optical fiber emitter HFBR-1414T, the cathode 3 of the optical fiber emitter HFBR-1414T is connected in parallel with a resistor V R5 and a diode II D2, the other end of the resistor V R5 is connected with the collector C of the triode I Q1, and the cathode of the diode II D2 is connected with the anode pins 2, 6 and 7 of the optical fiber emitter HFBR-1414T through a. The photoelectric converter 9 and the photoelectric coupler N1 are powered by a standard power supply Vp, the diode I D1 adopts IN5407, the diode II D2 adopts IN4148, the photoelectric coupler N1 adopts 4N25, and the triode I Q1 adopts an NPN triode BCY-59. The control unit 10 collects an optical signal from the photoelectric converter 9 through the external photoelectric receiver 11, judges whether the thyristor one and the thyristor two have a fault, and sends an optical signal to the photoelectric conversion circuit 1 according to the fault state to control the on and off of the thyristor one and the thyristor two.
The thyristor response trigger circuit is provided with a photoelectric conversion circuit 1, a waveform shaping circuit 2, a push-pull circuit 3, a current-limiting resistor eight R8, a voltage-stabilizing tube four D4, a field effect tube Q4, a thyristor trigger transformer T1, a thyristor trigger transformer T2, a plug J3, a plug J4, a first thyristor and a second thyristor which are plugged in the plug J3 and the plug J4, wherein in the embodiment, a positive power supply V is arranged+The same-name ends of two groups of thyristor-triggered transformers (T1/T2) are connected in parallel with the anode of the diode five D5, or one or more groups of thyristor-triggered transformers T1 are connected in parallel, for example:
the photoelectric conversion circuit 1 receives an optical signal output by the control unit 10 through the external photoelectric converter 12, converts the optical signal into an analog electrical signal, the output end of the photoelectric conversion circuit 1 is connected with the input end of the waveform shaping circuit 2, the waveform shaping circuit 2 shapes the analog electrical signal into a square wave waveform, the output end of the waveform shaping circuit 2 is connected with the input end of the push-pull circuit 3 to provide a driving signal for the push-pull circuit 3, the output end of the push-pull circuit 3 is connected with the grid of a field-effect tube Q4 through a current-limiting resistor eight R8 and is a field-effect tube Q4 providing a gate driving signal, the grid of the field effect transistor Q4 is also butted with the ground through a regulator tube four D4, the source of the field effect transistor Q4 is butted with the ground, the drain of the field effect transistor Q4 is connected with the anode of a diode five D5, and a diode five D5 is connected with a positive power supply V through a first RC parallel circuit+The first RC parallel circuit is also connected with a voltage stabilizing diode six D6 in parallel, and the anode and the cathode of the voltage stabilizing diode six D6 are respectively connected with the positive power supply V+Connected with the cathode of the diode five D5, and a positive power supply V+The same name end of a thyristor trigger transformer T1 is connected in series between the drain electrode of a field effect transistor Q4, the secondary side of a thyristor trigger transformer T1 and a diode DT1 are connected in series between a control electrode G1 and a cathode K1 of a first thyristor, the negative electrode of the diode DT1 is connected with the control electrode G1 of the first thyristor, and the positive electrode of the diode DT1 is connected with the secondary side of the thyristor trigger transformer T1.
Preferably, the voltage-regulator diode six D6 is IN4750A, the diode five D5 is MUR460, the field-effect tube Q4 is IRF840, the source of the field-effect tube Q4 is butted with the ground through a resistor ten R10,
a resistor twelve R12 is connected in series between the dotted terminal of the thyristor trigger transformer T1 and the anode of the diode five D5, another resistor fourteen R14 is connected in series between the dotted terminal of the thyristor trigger transformer T2 and the anode of the diode five D5, the drain of the field effect transistor Q4 is also connected in parallel with an RC series circuit, the other end of the RC series circuit is butted with the ground, the RC series circuit comprises a resistor eleven R11 and a capacitor six C6 which are connected in series, a resistor eleven R11 is also connected in parallel with the diode seven D7, the cathode of the diode seven D7 is connected with the capacitor six C6, and the anode is connected with the drain of the field effect transistor Q4.
When the voltage of the S electrode of the field effect transistor Q4 is too high, the diode seven D7 is used for rapidly charging the capacitor six C6, and when the field effect transistor Q4 is switched on, the capacitor C6 is prevented from reversely discharging. When the field effect transistor Q4 is turned on, the capacitor C6 discharges slowly through the resistor R11, and the capacitor C6 is prevented from being damaged due to too high charging.
A second RC parallel circuit is connected in series between one end of the resistor twelve R12/(R13) far away from the dotted end of the thyristor-triggered transformer T1/(T2) and the anode of the diode five D5, and the second RC parallel circuit comprises a capacitor and a resistor connected in parallel, such as a capacitor seven C7 and a resistor thirteen R13, a capacitor eight C8 and a resistor fifteen R15 in fig. 1.
The photoelectric conversion circuit 1 comprises an optical fiber receiver module, and the waveform shaping circuit comprises a Schmitt trigger. The optical fiber receiver module is HFBR-2412T, the Schmidt trigger is CD40106, pins 7 and 3 of the optical fiber receiver module are connected with the ground, pins 2 and 6 of the optical fiber receiver module are respectively connected with the cathode of a voltage stabilizing diode three D3 and the pin 1 of the Schmidt trigger, the cathode of a voltage stabilizing diode three D3 is connected between a capacitor two C2 and a resistor six R6, the other ends of the capacitor two C2 and the resistor six R6 are grounded and connected with a power supply Vp, the pin 1 of the Schmidt trigger is connected between a capacitor three C3 and a resistor seven R7, the other ends of the capacitor three C3 and the resistor seven R7 are grounded and connected with the power supply Vp, the pin 2 of the Schmidt trigger is connected with the input end of a push-pull circuit 3, the pins 3, 6, 14, 12 and 11 of the Schmidt trigger are connected between the capacitor sixteen C16 and the power supply Vp, and the other end of the capacitor sixteen C16 is grounded, the push-pull circuit is an output circuit connected between two transistors BCY59 and BCY79 with different polarities, exists in the circuit in a push-pull mode, and is respectively responsible for positive and negative half-cycle waveform amplification tasks.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. A thyristor interlock control circuit comprising a thyristor responsive trigger circuit,
the thyristor response trigger circuit is provided with a photoelectric conversion circuit, a waveform shaping circuit, a push-pull circuit, a current-limiting resistor eight, a voltage-stabilizing tube four, a field-effect tube, a thyristor trigger transformer, a thyristor and a control unit, wherein the photoelectric conversion circuit receives an optical signal output by the control unit and converts the optical signal into an analog electrical signal, the output end of the photoelectric conversion circuit is connected with the input end of the waveform shaping circuit, the waveform shaping circuit shapes the waveform of the analog electrical signal into a square waveform, the output end of the waveform shaping circuit is connected with the input end of the push-pull circuit and provides a driving signal for the push-pull circuit, the output end of the push-pull circuit is connected with the grid electrode of the field-effect tube through the current-limiting resistor eight and provides a gate driving signal for the field-effect tube, the grid electrode of the field-effect tube is also in butt joint with the ground, the diode five is connected with a positive power supply through a first RC parallel circuit, the first RC parallel circuit is also connected with a voltage stabilizing diode six in parallel, the positive electrode and the negative electrode of the voltage stabilizing diode six are respectively butted with the positive power supply and the negative electrode of the diode five, the same-name end of a thyristor trigger transformer is connected in series between the positive power supply and the drain electrode of the field effect tube, the secondary side of the thyristor trigger transformer and the diode DT are connected in series between the control electrode and the negative electrode of the thyristor, the negative electrode of the diode DT is connected with the control electrode of the thyristor, and the positive electrode of the diode DT is connected.
2. The thyristor interlock control circuit according to claim 1, further comprising a thyristor failure detection circuit, wherein the thyristor failure detection circuit is provided with a photo coupler, a first triode, and a photo-electric converter, an input pin of the photo coupler monitors voltages at two ends of a cathode and an anode of the thyristor, a first diode is further connected in parallel between the cathode and the anode of the thyristor, an output pin of the photo coupler outputs a level signal to a base of the first triode after voltage division adjustment, an emitter of the first triode is grounded, and a collector is connected to a pin of the photo-electric converter, so that the photo-electric converter emits a light signal according to a voltage state of the thyristor, the control unit collects the light signal from the photo-electric converter, judges whether the thyristor is failed, and emits the light signal to the photo-electric conversion circuit according to the failure state, and controlling the turn-off and the turn-on of the thyristor.
3. A thyristor interlock control circuit as claimed in claim 1, wherein the positive power supply is connected in parallel with the dotted terminals of at least one group of thyristor-triggered transformers between the positive supply and the positive pole of diode five.
4. The thyristor interlock control circuit of claim 1, wherein a resistor twelve is connected in series between the dotted terminal of the thyristor-triggered transformer and the anode of the diode five, the drain of the fet is also connected in parallel with an RC series circuit, the other end of the RC series circuit is connected to ground, a resistor eleven in the RC series circuit is connected in parallel with a diode seven, the anode of the diode seven is connected to the drain of the fet, and the cathode of the diode seven is connected to a capacitor six in the RC series circuit.
5. A thyristor interlock control circuit as claimed in claim 4, wherein a second RC parallel circuit is connected in series between the end of the resistor twelve remote from the dotted terminal of the thyristor-triggered transformer and the anode of the diode five.
6. The thyristor interlock control circuit of claim 2, wherein a first current limiting resistor is further connected in series between the cathode of the first diode and the input pin of the optocoupler.
7. The thyristor interlock control circuit according to claim 2, wherein a second divider resistor is connected in series between the output pin of the photocoupler and the base of the first triode.
8. The thyristor interlock control circuit of claim 2, wherein the one end of the second divider resistor connected to the output pin of the optocoupler is further grounded via a third resistor.
9. The thyristor interlock control circuit of claim 8, wherein the base of the first transistor is further coupled to ground through a first capacitor and a fourth resistor.
10. A thyristor interlock control circuit as claimed in claim 2, wherein the opto-electronic converter comprises an optical fibre transmitter having a cathode connected in parallel with a resistor five and a diode two, the other end of the resistor five being connected to the collector of the transistor one, the cathode of the diode two being connected to the anode of the optical fibre transmitter via a light emitting diode LED 1.
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| CN202010644669.XA CN111884638A (en) | 2020-07-07 | 2020-07-07 | Thyristor interlocking control circuit |
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| US4039866A (en) * | 1975-03-07 | 1977-08-02 | Hitachi, Ltd. | Thyristor control apparatus |
| US4682278A (en) * | 1984-09-18 | 1987-07-21 | Siemens Aktiengesellschaft | Procedure and device for detecting the non-conducting state of turn-off thyristors |
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