SU1077042A1 - Device for separate control of rectifier converter - Google Patents

Abstract

A DEVICE FOR SEPARATE CONTROL OF A VENTILAL TRANSFORMATION containing a phase control unit, the outputs of which are connected through control pulse drivers with terminals for connection to the converter valves and voltage sensors on the groups of valves that are related. so that, with the aim of increasing reliability, IHO is equipped with logical blocks according to the number of valve groups, each of which contains three AND-NOT elements, an NOT element and an R5 trigger, and the first inputs of the first and second AND-NOT elements are connected to the sensor outputs voltages, the second inputs through the element are NOT connected to the R-input of the R5-trigger and the output of the driver control j л pulses, the outputs of the first and second (L AND-NOT elements through the third element AND-NOT connected to the S-RS input of the trigger, the outputs of which are connected to the inputs of the phase control unit.

Description

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The invention relates to a converter technique, ai specifically to control devices of static semiconductor converters.

A device for separate control of a reversible valve transducer is known, which comprises phase control units and voltage sensors tl 3 with phase control units.

A disadvantage of this device is the low reliability of operation when switching valve groups.

The closest to the technical essence of the invention is a device for separate control, | 5 containing a phase control unit, the outputs of which are connected to the terminals for connecting to the valves through the control pulse drivers and to the ventilator groups G-2Q.

The disadvantage of this device is low reliability.

The purpose of the invention is to increase the reliability of 25

The goal is achieved by the fact that the device that contains the phase control unit, the outputs of which are connected via control pulse shapers with leads for connecting to the valves, and the voltage sensors on the valve groups, is supplied with logic blocks according to the number of groups valve, each of which contains three elements AND-NOT, element NOT and P5-trigger, the first inputs of the first and second elements AND-NOT connected to the outputs of the voltage sensors, the second inputs through the element are NOT connected to R. - RS-trigger input and exiting formiro Atel 40 control pulses, the outputs of the first and second AND-NO elements are connected via the third AND-NO element with E-R5-trigger input, outputs of which are connected to the inputs of phase block. 45 th control.

The drawing shows a functional diagram of the device for separate control of converter fans .. 50

The device contains voltage sensors 1 connected to groups of counter-parallel 1 connected valves 2 and 3, logic blocks 4 and actuators 5 and 6 of control pulses. Each of the sensors of the voltage 1 is made on a transistor key 7 connected through a resistive divider on resistors 8 and 9 of the parallel valves 2 and 3. Basic 60 Transistor transistor 7 is bridged and iodine 10 for protection against reverse voltage. The transition emitter-collector of the transistor 7 is included in the diago: ngl constant nog. Trka diode my- 5

Ta 11, in the diagonal of the alternating current of which the series-connected windings of the supply transformer 12 and the isolation transformer 13 are connected. The primary winding of the supply transformer 12 is connected to a high-frequency alternating voltage generator. To the secondary windings of transformers through an diode bridge 14 and a resistive divider resistors 15 and 16 are connected to intermediate transistors 17, in the collector circuit of which resistors 18 are connected. The collector of transistor 17 is connected to p. input element 19 is NOT. Elements 20 and 21 of the NAND are connected to the outputs of the voltage sensor 1, the closures of which are connected to the adjusting input R5 of the trigger 24 through the element 22 AND-NOT. The other inputs of the elements 20 and 21 are connected to the output of the imaging unit 5 t6}. Moreover, to the same outputs of the formers 5 and b, another setup input of the trigger 24 is connected.

The device works as follows.

When the valves 2 and 3 are turned on and the polarity indicated in the drawing is, the voltage across the valve group at the output of the upper channel of the sensor 1 is equal to one. The latter occurs because the key 7 opens and the high-frequency signal from the secondary current of the transformer 12 passes through the diode bridge 11, the key 7 and the primary winding of the isolation transformer 13. The signal from the secondary winding of the transformer 13 is rectified by the bridge 14 and is connected to the intermediate transistor 1 17, including the latter. As a result, a signal equal to one appears at the output of element 19, indicating the presence of voltage at the valve group with polarity accepted in the drawing. When the voltage is reversed at the valve group, a signal equal to one appears on the element 19 of the lower channel.

If there is at least one of the signals at the outputs of sensor 1 and the absence of signals at the outputs of the formers 5 and b, the triggers 24 of the upper and lower channels by the signal from the elements 22 are set to Unit, which corresponds to the off state of fans 2 and 3.

When a control pulse is applied to turn on the thyristor 2 from the output of the imager 5, a signal arrives at the input of block 4 and sets the trigger 24 of the upper channel to the Zero state. At the same time, the control signal through the element 23 enters the inputs of the elements 20 and 21, blocking sensors on

prine If during the existence of a pulse on. the control electrode of the valve 2 is turned on, the signal Zero appears at the outputs of sensor 1, and after removing the control pulse, the upper channel trigger 24 remains in the zero position. which corresponds to the on state of the valve 2. The signal at the output of the trigger 24 of the lower kanggsha remains equal to one.

If 13a exists for them). The pulse control valve 2 is not turned on then by. termination of the control signal trigger 24 upper ka-,

It returns to one, indicating that the valve 2 is turned off.

The circuit works similarly when the thyristor 3 is turned on.

The use of a device for separate control of a valve converter allows the converter control systems to be simplified, where this valve connection is used, by using the following principle of formulating (control signals of the valve control, which increases the overhead converter converters).

Claims (1)

DEVICE FOR SEPARATE CONTROL OF THE VENTAL CONVERTER LEM containing a phase control unit, the outputs of which are connected via control pulse shapers with outputs for * connecting to converter valves and voltage sensors on valve groups, which is due to the fact that, in order to increase reliability,> it is equipped with logic blocks according to the number of groups gates, each of which contains three AND-NOT elements, an NOT element and an R5 trigger, with the first inputs of the first and second AND elements NOT connected to the outputs of the voltage sensors, the second inputs through the element NOT connected to the R input of the R5 trigger and the output of the driver of the control g pulses, the outputs of the first and second elements AND-NOT through the third element AND-NOT connected to the S-input of the RS-trigger, the outputs of which are connected to the \ inputs of the phase control unit.