CN203690926U - Trigger circuit of direct light-activated thyristor - Google Patents

Abstract

The utility model discloses a trigger circuit for directly triggering a thyristor by light, which uses a laser trigger signal to trigger the thyristor. The trigger circuit includes a photoelectric conversion circuit connected in sequence, a pulse supply unit and a laser tube unit, and the pulse supply circuit is connected with the A photoelectric isolation circuit, and a voltage stabilization circuit for respectively stabilizing the input 24V DC voltage to 5V voltage and 2.5V voltage to provide corresponding voltages for each power consumption circuit. The trigger circuit of the direct light-triggered thyristor of the utility model can overcome the defects of poor stability, low reliability and short service life in the prior art, so as to realize the advantages of good stability, high reliability and long service life.

Description

A trigger circuit for direct light-triggered thyristor

technical field

The utility model relates to the technical field of electronic circuits, in particular to a trigger circuit for directly triggering a thyristor with light.

Background technique

The direct light-triggered thyristor integrates the light-triggered functional unit into the LTT silicon chip, and at the same time integrates the break over diode (Break Over Diode) for forward overvoltage protection (referred to as BOD protection) into the LTT silicon chip, so that the direct light-triggered The thyristor itself has a photosensitive trigger area and also has a BOD protection function. Together with ordinary ETT, LTT technology is applied to thyristor valve groups in high-voltage direct current transmission and static reactive power compensation devices, in which the trigger circuit of direct light-triggered thyristors is an important part of LTT thyristor valve groups, and it is also a technology The essential.

At present, the voltage level of the thyristor valve group used in China is below 35kV, and all of them are triggered by the electrical signal of the thyristor through the TE board of the thyristor electronic circuit, and each thyristor needs a TE board. For the triggering of the thyristor with a large voltage level, there are At the same time, the TE board needs to obtain energy through RC in the valve group, and the stability, reliability, and service life of the power system need to be further improved.

In the process of realizing the utility model, the inventors found that the prior art at least has defects such as poor stability, low reliability and short service life.

Utility model content

The purpose of this utility model is to propose a trigger circuit for direct light triggering thyristors to achieve the advantages of good stability, high reliability and long service life in view of the above problems.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a trigger circuit for directly triggering the thyristor by light, using a laser trigger signal to trigger the thyristor, and the trigger circuit includes a photoelectric conversion circuit connected in sequence, a pulse supply unit and a laser tube unit , a photoelectric isolation circuit connected to the pulse supply circuit, and a voltage stabilization circuit for respectively stabilizing the input 24V DC voltage to 5V voltage and 2.5V voltage to provide corresponding voltages for each power consumption circuit;

The photoelectric conversion circuit is used to perform photoelectric conversion based on the input optical trigger pulse signal, and then output to the pulse supply unit; the photoelectric isolation circuit is used to perform photoelectric isolation processing on the input control trigger pulse output signal, and then output to the A pulse supply unit; the laser tube unit is configured to output a strong laser trigger signal after processing the input laser tube breakdown signal and lost pulse signal.

Further, the pulse supply unit includes a 2uS pulse circuit and a 10uS pulse circuit arranged in parallel and respectively connected to the photoelectric conversion circuit, and a pulse circuit respectively connected to the 2uS pulse circuit, 10uS pulse circuit and the laser tube unit. synthetic circuit.

Further, the laser tube unit includes a laser tube breakdown detection circuit, a laser tube emission circuit, and a lost pulse detection circuit arranged in parallel and connected in sequence, and the laser tube emission circuit is connected to a pulse synthesis circuit;

The laser tube breakdown detection circuit is used to process the input laser tube breakdown signal and output it to the laser tube emission circuit; the lost pulse detection circuit is used to output the input pulse loss signal to the laser tube emission circuit after processing. circuit; the laser tube emitting circuit, used to output the laser tube intensity after processing based on the output signal of the laser tube breakdown detection circuit, the output signal of the lost pulse detection circuit and the output signal of the pulse synthesis circuit trigger signal.

Further, the laser tube emitting circuit includes a first amplifying module, a second amplifying module, and a laser tube emitting module sequentially connected to the output end of the pulse synthesis circuit, and the laser strong trigger signal emitted by the laser tube emitting module The light is transmitted through a laser fiber to directly trigger a thyristor.

Further, the laser tube emitting circuit further includes a current limiting module connected to the laser tube emitting module and then grounded.

Further, the current limiting module includes a second current limiting resistor R108 and a third current limiting resistor R109 sequentially connected between the laser tube emitting module and ground.

Further, the first amplification module includes a first triode V11, a first resistor R17, a second resistor R18 and a first capacitor C25, wherein:

The base of the first triode V11 is connected to the output terminal of the pulse synthesis circuit, the collector of the first triode V11 is connected to a 24V DC voltage after the first resistor R17, and the collector of the first triode V11 The electrode is also connected to the positive pole of the first capacitor C25, the negative pole of the first capacitor C25 is grounded, the emitter of the first triode V11 is grounded after passing through the second resistor R18, and the emitter of the first triode V11 is connected to the second amplifying module input connection.

Further, the second amplification module includes a second transistor V12, a third resistor R19, a first diode D13 and a second capacitor C26, wherein:

The base of the second triode V12 is connected to the emitter of the first triode V11, the base of the second triode V12 is also connected to the cathode of the first diode D13, and the second triode V12 The collector of the second transistor V12 is connected to the 24V DC voltage through the third resistor R19, the collector of the second transistor V12 is also connected to the positive pole of the second capacitor C26, the negative pole of the second capacitor C26 is grounded, and the emitter of the second transistor V12 is connected to the positive pole of the second capacitor C26. The anode of the first diode D13 is connected, and the emitter of the second triode V12 is also connected with the laser tube emitting module.

Further, the laser tube emission module includes a first current limiting resistor R100 connected to the emitter of the second triode V12, and a One end of the emitter is connected to a plurality of laser tube emitting sub-modules connected in series.

Further, the multiple laser tube modules have the same structure; wherein, the first laser tube module includes an anode connected to the end of the first current limiting resistor R100 away from the emitter of the second triode V12, and a cathode connected to the second laser diode V12. The tube module is connected to the first laser tube V101, and the first equalizing resistor R101 is connected in parallel between the anode of the first laser tube V101 and the cathode of the first laser tube V101.

The trigger circuit of the direct light-triggered thyristor in each embodiment of the present invention adopts laser trigger signal to trigger the thyristor. Photoelectric isolation circuit, and a voltage stabilization circuit used to stabilize the input 24V DC voltage to 5V voltage and 2.5V voltage to provide corresponding voltages for each power consumption circuit; the signal that can pass through the photoelectric isolation circuit when controlling the trigger pulse output signal Under the control, the synthesized pulse signal is sent to the laser tube emission circuit, and the laser strong trigger signal is output to the direct light trigger thyristor; thus, the defects of poor stability, low reliability and short service life in the prior art can be overcome to achieve good stability , high reliability and long service life.

Other features and advantages of the present invention will be set forth in the following description, and, in part, will be apparent from the description, or can be learned by practicing the present invention.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is the schematic diagram of the working principle of the trigger circuit of the direct light-triggered thyristor of the present invention;

Fig. 2 is a schematic diagram of the electrical principle of the laser tube emitting circuit in the trigger circuit of the direct light trigger thyristor of the present invention.

Detailed ways

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model.

In order to solve the problems existing in the prior art, according to the embodiment of the present invention, as shown in Figure 1 and Figure 2, a trigger circuit for direct light-triggered thyristors is provided, specifically related to a trigger circuit for direct light-triggered thyristors, which is applied to 66KV In light-controlled SVC compensation devices with voltage levels above and above. The trigger circuit of the direct light-triggered thyristor, its output signal is a modulated pulse signal with strong trigger, which is directly transmitted to the photosensitive area of the thyristor through the laser trigger optical fiber, triggers the thyristor, improves the anti-interference ability of the thyristor trigger signal, and further improves the Reliability of SVC compensation device.

The trigger circuit of the direct light-triggered thyristor in this embodiment uses a laser trigger signal to trigger the thyristor, including a photoelectric conversion circuit, a 2uS pulse circuit, a 10uS pulse circuit, a pulse synthesis circuit, a laser tube emission circuit, a laser tube breakdown detection circuit, and a photoelectric isolation circuit. circuit, lost pulse detection circuit and voltage stabilizing circuit, the optical trigger pulse signal passes through the photoelectric conversion circuit to convert the optical signal into an electrical signal, one way passes through the 2uS pulse circuit, and the other passes through the 10uS pulse circuit, and the two circuits pass through the pulse synthesis circuit at the same time , under the signal control of the control trigger pulse output signal through the photoelectric isolation circuit, the synthesized pulse signal is sent to the laser tube emission circuit, and the output laser strong trigger signal is sent to the direct light-triggered thyristor; in the laser emission circuit, through the breakdown detection of the laser tube The circuit and the pulse loss detection circuit respectively output the laser tube breakdown signal and the pulse loss signal, and send them to the pulse control cabinet. The voltage stabilizing circuit stabilizes the input 24V DC voltage to 5V and 2.5V voltages, and provides corresponding voltages for each circuit.

Specifically, as shown in Figure 1, the trigger circuit of the thyristor directly triggered by light uses a laser trigger signal to trigger the thyristor, including a photoelectric conversion circuit, a 2uS pulse circuit, a 10uS pulse circuit, a pulse synthesis circuit, a laser tube emission circuit, and a laser tube breakdown circuit. Detection circuit, photoelectric isolation circuit, lost pulse detection circuit and voltage stabilization circuit, the optical trigger pulse signal passes through the photoelectric conversion circuit to convert the optical signal into an electrical signal, one path passes through the 2uS pulse circuit, and the other path passes through the 10uS pulse circuit, these two circuits At the same time, through the pulse synthesis circuit, under the control of the trigger pulse output signal through the photoelectric isolation circuit, the synthesized pulse signal is sent to the laser tube emission circuit, and the laser strong trigger signal is output to the direct light trigger thyristor; in the laser emission circuit, through The laser tube breakdown detection circuit and the lost pulse detection circuit respectively output the laser tube breakdown signal and the lost pulse signal, and send them to the pulse control cabinet. The stabilized voltage circuit is to stabilize the input 24V DC voltage to 5V and 2.5V voltages, and provide corresponding voltages for each circuit.

As shown in Figure 2, the laser tube emission circuit includes two triodes V11 and V12, diode D13, capacitors C25 and C26, resistors R17, R18, R19 and R100~R109, laser tubes V101~V107, and the pulse signal output by the pulse synthesis circuit , after the amplification of transistors V11 and V12, the filtering of capacitors C25 and C26, the protection of diode D13, the current limiting of resistors R100, R108 and R109, and the voltage equalization of resistors R101~R107, a strong laser trigger signal is sent out through laser tubes V101~V107 , transmitted through a laser fiber to a direct light-triggered thyristor.

In the above embodiments, the working principle of the trigger circuit of the direct light trigger thyristor is that the control cabinet sends out a trigger pulse signal, which is sent to the pulse receiving board in the trigger box through the optical fiber, and the trigger circuit of the direct light trigger thyristor becomes a strong laser trigger signal , through the special optical fiber triggered, the laser strong trigger signal is sent to the gate of the light-controlled thyristor, the conduction angle of the thyristor is controlled, and then the current of the TCR reactor is controlled, that is, the reactive power compensation is adjusted. With FC capacitive reactive power, reactive power compensation is finally realized, which improves the reliability of triggering and prolongs the working life of the system.

In the above embodiment, the trigger circuit of the direct light-triggered thyristor is located in the trigger box in the middle of the lower part of the two light-controlled thyristor valve group units in the valve group chamber, thus greatly reducing the amount of trigger optical fiber and making the installation of the system simple. It is easy to maintain and has strong anti-interference ability, which improves the reliability of the system and reduces the cost of the system.

The trigger circuit of the direct light-triggered thyristor of the above-mentioned embodiments of the utility model is applied to a light-controlled SVC compensation device with a voltage level of 66kV and above. The trigger circuit of the direct light-triggered thyristor includes a photoelectric conversion circuit, a 2uS pulse circuit, and a 10uS pulse Circuit, pulse synthesis circuit, laser tube emission circuit, laser tube breakdown detection circuit, photoelectric isolation circuit, lost pulse detection circuit and voltage stabilization circuit, the light trigger pulse signal passes through the photoelectric conversion circuit to convert the optical signal into an electrical signal, all the way through 2uS pulse circuit, the other through the 10uS pulse circuit, the two circuits pass through the pulse synthesis circuit at the same time, under the control of the trigger pulse output signal through the photoelectric isolation circuit, the synthesized pulse signal is sent to the laser tube emission circuit, and the output laser intensity The trigger signal is directly light-triggered thyristor, which has high trigger reliability, strong anti-interference, long working life and low working power consumption.

Compared with the prior art, at least the beneficial effects that can be achieved by the trigger circuit of the direct light-triggered thyristor in the above embodiments of the present invention are:

(1) The trigger pulse input signal is synthesized into a strong trigger signal through the trigger circuit of the direct light trigger thyristor to ensure that the thyristors with inconsistent parameters can be turned on reliably and at the same time. The laser trigger signal and optical fiber transmission are used to complete the triggering of the direct light trigger thyristor, and the anti-interference ability powerful;

⑵Meet the triggering requirements of different types of direct light-triggered thyristors;

(3) It has the functions of laser tube breakdown detection and lost pulse detection; ensures the reliable operation of the trigger circuit of the direct light trigger thyristor, avoids the failure of the thyristor valve group of the SVC compensation device, and can promptly notify the control cabinet to output the control trigger pulse when the trigger circuit fails output signal to block the output of the laser trigger signal to ensure that every part of the system can operate reliably.

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. the circuits for triggering of a direct light triggered thyristor, it is characterized in that, adopt laser trigger signal to trigger thyristor, described circuits for triggering comprise that the photoelectric switching circuit, the pulse that connect successively provide unit and laser tube unit, the photoelectric isolating circuit that provides circuit to be connected with described pulse, and for the 24V direct voltage of input respectively voltage stabilizing provide the voltage stabilizing circuit of corresponding voltage to 5V voltage and 2.5V voltage for each power circuit;

Described photoelectric switching circuit, carries out, after opto-electronic conversion, exporting pulse to unit being provided for the light trigger pulse signal based on input; Described photoelectric isolating circuit, carries out, after photoelectricity isolation processing, exporting pulse to unit being provided for the control trigger impulse output signal based on input; Described laser tube unit, for the laser tube breakdown signal based on input with after losing pulse signal and processing, the strong triggering signal of Output of laser.

2. the circuits for triggering of direct light triggered thyristor according to claim 1, it is characterized in that, described pulse provides unit, comprise parallel 2uS impulse circuit and the 10uS impulse circuit that arranges and be connected with described photoelectric switching circuit respectively, and the pulse combiner circuit being connected with described 2uS impulse circuit, 10uS impulse circuit and laser tube unit respectively.

3. the circuits for triggering of direct light triggered thyristor according to claim 2, it is characterized in that, described laser tube unit, comprise that the parallel laser tube arranging and connect successively punctures testing circuit, laser tube radiating circuit and loses pulse-detecting circuit, described laser tube radiating circuit is connected with pulse combiner circuit;

Described laser tube punctures testing circuit, after processing, exports laser tube radiating circuit to for the laser tube breakdown signal based on input; The described pulse-detecting circuit of losing, for exporting laser tube radiating circuit to based on losing after pulse signal is processed of input; Described laser tube radiating circuit, for puncture based on described laser tube testing circuit output signal, described in lose after the output signal of pulse-detecting circuit and the output signal of described pulse combiner circuit process, the strong triggering signal of Output of laser pipe.

4. the circuits for triggering of direct light triggered thyristor according to claim 3, it is characterized in that, described laser tube radiating circuit, comprise the first amplification module, the second amplification module and the laser tube transmitter module that are connected with the output of described pulse combiner circuit successively, the strong triggering signal of laser that described laser tube transmitter module sends is transferred to direct light triggered thyristor by laser fiber.

5. the circuits for triggering of direct light triggered thyristor according to claim 4, is characterized in that, described laser tube radiating circuit also comprises the current limliting module that is connected rear ground connection with described laser tube transmitter module.

6. the circuits for triggering of direct light triggered thyristor according to claim 5, is characterized in that, described current limliting module comprises the second current-limiting resistance R108 and the 3rd current-limiting resistance R109 that are connected in turn between described laser tube transmitter module and ground.

7. according to the circuits for triggering of the direct light triggered thyristor described in any one in claim 4-6, it is characterized in that, described the first amplification module, comprises the first triode V11, the first resistance R 17, the second resistance R 18 and the first capacitor C 25, wherein:

The base stage of described the first triode V11 is connected with the output of described pulse combiner circuit, the collector electrode that the collector electrode of the first triode V11 meets 24V direct voltage, the first triode V11 after the first resistance R 17 is also connected with the positive pole of the first capacitor C 25, the minus earth of the first capacitor C 25, the emitter of the first triode V11 is ground connection after the second resistance R 18, and the emitter of the first triode V11 is connected with the input of the second amplification module.

8. the circuits for triggering of direct light triggered thyristor according to claim 7, is characterized in that, described the second amplification module comprises the second triode V12, the 3rd resistance R 19, the first diode D13 and the second capacitor C 26, wherein:

The base stage of described the second triode V12 is connected with the emitter of the first triode V11, the base stage of the second triode V12 is also connected with the negative electrode of the first diode D13, the collector electrode that the collector electrode of the second triode V12 meets 24V direct voltage, the second triode V12 through the 3rd resistance R 19 is also connected with the positive pole of the second capacitor C 26, the minus earth of the second capacitor C 26, the emitter of the second triode V12 is also connected with laser tube transmitter module with the anodic bonding of the first diode D13, the emitter of the second triode V12.

9. the circuits for triggering of direct light triggered thyristor according to claim 8, it is characterized in that, described laser tube transmitter module, comprise the first current-limiting resistance R100 being connected with the emitter of described the second triode V12, and the multiple laser tube transmitting submodules that are connected away from one end of the emitter of the second triode V12 with described the first current-limiting resistance R100 and connect.

10. the circuits for triggering of direct light triggered thyristor according to claim 9, is characterized in that, the structure of described multiple laser tube submodules is identical; Wherein, the first laser tube submodule, comprise anode with the first current-limiting resistance R100 away from the first laser tube V101 that one end of the emitter of the second triode V12 is connected, negative electrode is connected with the second laser tube submodule, and be connected in parallel on the first grading resistor R101 between the anode of described the first laser tube V101 and the negative electrode of the first laser tube V101.

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