SU1365284A1 - Apparatus for separate control of reversible thyristor converter - Google Patents

Abstract

This invention relates to electrical engineering and can be used in thyristor converters. The purpose of the invention is to increase reliability. The invention provides improved reliability of control of reverse thyristor converters, since it eliminates the possibility of simultaneously supplying control pulses to the thyristors of the Forward and Back groups and also simplifies the device by eliminating power transistors for pulse amplifiers. 1 il. with $

Description

The invention relates to electrical engineering, namely to converter technology, and can be used to separately control a reversible thyristor converter.

The purpose of the invention is to increase the reliability of separate control of the thyristor converter.

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The dyes of the first 16 and third 17 optocoupler thyristors are interconnected and. are intended to be connected through the protective disconnecting unit 21 to the positive pole of the second power source 22, the cathode of the first optocoupler thyristor 16 is connected to the anode of the fourth optocoupler thyristor 20, the cathode

The drawing shows the circuit of the device of the second shunt diode 15 and the department.

A device for separate control of a reverse thyristor converter 1, containing by number

thyristors separation transformer-} f thyristor 19, the cathode of the first shuntitor 2-5, the ends of the primary windings of which are connected to the collectors of transistors 6-9, the emitters of which are connected to the common power supply bus, and the bases to the outputs of blocks 10 and 11 of phase shifting windings of isolation transformers are interconnected respectively for the Forward and Back groups and connected to the power source via an electronic switch 12, the control inputs of which are connected to the outputs of the unit 13 of the separate work of thyristor groups , additionally equipped with the first 14 and second 15 shunt diodes, the anodes (cathodes) of which are connected to the emitters of transistors 6-9 of the type pnp (rnp), and the cathodes (anodes) are connected respectively to the beginnings of the primary windings of the isolation transformers 2-5, and the electronic switch 12 is designed as a reverse bridge switch, the anodes of the LEDs of the first 16 and third 17 optocoupler thyristors are interconnected and intended to be connected to the positive pole of the power supply 18, the cathode of the first optocoupler LED thyristor 16 is connected to the anode of the led of the second optocoupler thyristor 19, the cathode of the led of which is connected to the first output of block 13 of the separate work of the thyristor groups, and the cathode of the led of the third optocoupler thyristor 17 is connected to the anode of the led of the fourth optocoupler thyristor 20, the cathode of the led of which is connected to the second the output of the separate operation unit 13 of the thyristor groups, a) the third output of which is connected to the common bus of the power supply source 18 and is intended to be connected to the negative pole of the first power supply, the anols of the primary windings of the dividing transformers of the Forward group, the cathode of the third optocoupler thyristor 17 is connected to the anode of the second optocoupler

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of the driving diode 14 and the beginnings of the primary windings of isolating transformers of the group Back. The cathodes of the second and fourth optocoupler thyristors are interconnected and are intended to be connected to the negative pole of the power source.

The device works as follows.

The transistors 6-9 are controlled by the program of the units 10 and 11 of the phase shift. The unit of separate operation of the thyristor groups 13 forms commands permitting the supply of control pulses.

0 to the thyristors of either the Forward group or the Back group so that when the thyristors of one group are unlocked, the thyristors of the other are locked. Moreover, the reverse program provides for the off state of all the thyristors of the converter 1 for the time of the dead time when switching. Simultaneous supply of control pulses to thyristors of different groups is not permissible. During the dead time, the optocoupler thyristors .16, -17, 19, and 20 are locked, and their control LEDs are de-energized. Control pulse shapers,

The gs made on transistors 6-9 and separation transformers 2-5 are not powered, and control pulses are not generated. When the thyristor research institutes are turned on, for example, the Forward group, the separate operation unit 13 connects the power to the control LEDs of the optocoupler thyristors 16 and 19. The latter are unlocked and connect the power source 22 to the pulse units of the Forward group along the circuit: positive pole of the source 22, protective shutdown unit 21, optical thyristor 16, primary windings of isolation transformers 2 and 4,

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transistors 6 and 8, the first shunt diode 14, the thyristor optocoupler 19, the negative pole of the power source 22.

The group of pulse shapers back at this time are shunted by diode I4 and do not receive power. During a dead pause, the control LEDs are de-energized, the transistors of the pulse shapers are locked and cause the optocoupler thyristors 16 and 19 to be locked. The control pulses on the thyristors of the Back are similarly locked . If at the time of unlocking the optocoupler thyristors 1 7 and 20 of the Back group, at least one of the optocoupler I6 or 19 of the BV-switch group is open, due to the failure of block 13, or the output of the transistor, thyristor, and the like, the short circuit of the source 22, as a result, control pulses are not generated either by the Forward group or by the Back group.

To break the contour of the short trap, use the protective shutdown unit 21.

Thus, the invention makes it possible to increase the reliability of separate control of a reversible thyristor converter, completely excluding the possibility of simultaneously supplying control pulses to the thyristors of the Forward and Back groups.

Claims (1)

Formula of invention 40 25 A device for separate control of a reversible thyristor converter containing separation transformers and transistors according to the number of thyristors, the ends of the primary windings of transformers are connected to the collectors of the corresponding transistors, whose emitters are connected to the common power supply busbar, and the bases to the outputs of the phase shifters, the beginning of the primary windings isolation transformers are interconnected respectively for the Forward and Back groups and connected to the power supply nickname via an electronic switch five 0 0 The tator, whose control inputs are connected to the outputs of the separate operation unit of the thyristor groups, is about the fact that, in order to ensure reliability, it is equipped with the first and second shunt diodes, the anodes (cathodes) of which are connected to the emitters of n-type transistors pp (ppp), and the cathodes (anodes) are connected respectively with the beginnings of the primary windings of isolation transformers, and the electronic switch is designed as a reversible bridge switch, with the anodes of the first and third LEDs of the optocoupler thyristors Nena each other and are intended for connection to the positive pole of the first power source, a cathode of the LED of the first optocoupler is connected to the anode of the thyristor si; and the second optocoupler thyristor, the cathode of which the LED is connected to the first output 5 of the thyristor groups separate operation unit, and the cathode of the LED of the third optocoupler optocoupler is connected to the anode of the LED of the fourth optocoupler thyristor, the cathode of which the diode is connected to the second output of the separate unit of the thyristor groups, the third output of which is connected to the common power supply bus and is intended for connection to the negative pole the first power source, the anodes of the first and third optocoupler thyristors are interconnected and are intended to be connected through the protective trip unit to the field zhitelnomu second pole of the power source, a cathode of the first photocouple SCR is connected to the anode of a fourth thyristor photocouple, Ka Tod second shunt diode and 5 beginnings of the primary windings of separation transformers of the Forward group, the cathode of the third optocoupler thyristor is connected to the anode of the second optocoupler thyristor, the cathode of the first shunt diode and the beginnings of the primary windings of the isolating transformers of the Back group; nutrition 0 five 0 five Forward