SU1591149A1

SU1591149A1 - Shaper of thyristor control pulses

Info

Publication number: SU1591149A1
Application number: SU874206504A
Authority: SU
Inventors: Aleksandr L Barannikov; Mikhail V Bajkalov; Aleksandr A Gabrielyants; Vladimir V Gordeev; Aleksandr S Gladnikov; Aleksandr N Valyuk
Original assignee: Aleksandr L Barannikov; Mikhail V Bajkalov; Aleksandr A Gabrielyants; Vladimir V Gordeev; Aleksandr S Gladnikov; Aleksandr N Valyuk
Priority date: 1987-03-06
Filing date: 1987-03-06
Publication date: 1990-09-07

Description

The invention relates to electrical engineering and. can be used in thyristor converters. The purpose of the invention is to reduce losses when turning on the thyristor. The pulse shaper contains a generator 2, an output transformer 3, a bridge rectifier 4, a differentiating transformer 13, a coaxial cable 15. An optimally shaped unloading pulse is formed by cutting the coaxial cable 15 through a transistor 14, a diode 7, resistors 10 and 9. 1 Il.

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The invention relates to electrical engineering and can be used in converter control devices for switching on · high-speed thyristors with pulses of optimal shape.

The purpose of the invention is to reduce losses when turning on the thyristor.

The drawing shows a schematic diagram of a thyristor control pulse shaper.

The thyristor control pulse driver 1 contains a controlled oscillator 2 of bipolar rectangular-shaped pulses 15, an output transformer 3, a bridge rectifier 4, a capacitor 5, first 6, second 7 and third 8 diodes, first 9, second 10, third 11 and fourth 12 - 20 zistors, a differentiating transformer 13, a transistor 14 and a coaxial cable 15.

Managed generator 2 bipolar rectangular pulses, 25 inputs of which are designed to connect to a source of triggering signals and connected to the primary winding of the differentiating transformer 13, the outputs connected to the primary 39 winding of the output transformer 3, to the secondary winding of which is connected to the AC inputs of a bridge rectifier 4. Outputs DC bridge rectifier 4 shun- $$ tirovanyi capacitor 5. The positive output of the rectifier 4 is connected through a serially connected first diode 6 and the first resistor 9 with the control electrode of the thyristor 1, and the negative terminal is connected to the cathode of the thyristor 1 and the coaxial braid

cable 15. Parallel to the thyristor 1, the third 11 and fourth 12 resistors 45 are connected in series. The connection point of the third 11 and fourth 12 resistors is connected to the core of the coaxial cable 15, the collector of the transistor 14 and the cathode of the third diode 8, the anode of this diode is connected to the base of the transistor 14. The emitter of the transistor 14 is connected in series with the second diode 7 and the second resistor 10 is connected to the point the connections of the first diode 6 and the first resistor 9,

The thyristor control pulse driver operates as follows.

When the thyristor 1 is closed, the coaxial cable 15, which is a discharge line, is charged to a voltage determined by the voltage on the closed thyristor 1 taking into account the voltage divider made on the third 11 and fourth 12 resistors. When applying a triggering pulse of positive polarity to the inputs of a controlled generator 2 bipolar pulses of rectangular shape is formed on the secondary winding of the block of the differentiating transformer 13 a pulse unlocking the transistor 14.

When this coaxial cable 15 is discharged through the transistor 14, the second diode 7, the second resistor 10, the first resistor 9 and the control transition of the thyristor 1 and thereby a rectangular pulse is formed, the shape of which is determined by the characteristic impedance of the discharge circuit equal to the characteristic impedance of the discharge circuit), the amplitude is determined by the voltage on the locked transistor 14 and the voltage divider on the third 11 and fourth 12 resistors and exceeds the amplitude of the passport About long voltage several times, and the duration is determined by the length of the coaxial cable. Simultaneously with the unlocking of the transistor 14, a controlled oscillator 2 is started, forming a rectangular alternating voltage on the secondary winding of the output transformer 3, which, after being rectified by a bridge rectifier 4 • and filtered by a capacitor 5, is supplied to the control transition of the thyristor 1 through the first diode 6 and after the end of the pulse of the discharge circuit, since before the end of this pulse, the first diode 6 is locked, which is due to the over-amplitude of the discharge pulse lsa voltage amplitude of the voltage at the output of the bridge rectifier. The magnitude of the resistance of the first resistor 9 sets the current of the “supporting part” of the switching pulse, and the magnitude of the second resistor 10 coordinates the wave resistance of the coaxial cable 15 and the wave resistance of the discharge circuit.

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The shaper of the control pulse generator of the thyristor reduces the resorption time of the blocking diode of the control transition of the thyristor due to the fact that the shape of the current of the "shaping part" (discharge pulse) of the control pulse is almost rectangular, while in a known formulator the body is close to triangular. Thus, the thyristor is turned on in a shorter time and less energy of losses is dissipated in it.

Claims

Claims hell

A thyristor control pulse generator containing a controlled rectangular-shaped bipolar pulse generator whose inputs 20 are intended for connection to a source of triggering signals, an output transformer whose primary winding is connected to the outputs of a controlled bipolar rectangular-pulse generator, the first second and third resistors, characterized in that, in order to reduce losses when the thyristor is turned on, it is equipped with a coaxial cable, a fourth resistor, a bridge rectifier and a differentiating transformer, the bridge rectifier being connected by alternating current leads to the secondary winding of the output transformer, a capacitor is connected to the DC terminals of the bridge rectifier, and the positive lead of the bridge rectifier is connected to the control electrode of the thyristor through the series-connected the output is to the thyristor cathode, to which the coaxial cable braid is also connected, the primary winding of the differentiating transformer is soy dinene with inputs of a bipolar rectangular pulse generator, and the secondary winding is connected to the base-emitter junction of the transistor, the emitter of the transistor is connected via a second diode and the second resistor connected in series to the junction point of the first diode and the first resistor in a non-conducting direction, parallel to the thyristor are connected in series the third and fourth resistors, the connection point of the third and fourth cut tors connected to a coaxial cable of residential and collector of the transistor.