SU731550A1 - Single-channel device for control of multiphase power-diode converter - Google Patents

Description

one

The invention relates to electrical engineering and is intended for use in thyristor power supply devices.

A device for controlling a valve converter is known, comprising 5 synchronizing units, an adder, delay elements and power amplifiers 1.

The disadvantage of this device is complexity.

The closest to the technical essence of the present invention is a single-channel device for controlling a multiphase valve converter containing a phase-matching unit made in series of 15 connected synchronization pulse generator connected to the appropriate voltage supply of the converter and phase control unit, delay elements , pulse distributor, 20 pulses, executed on coincidence elements, synchronizing phase matching unit, control drivers Transducer valves 2.

The arrival of pulses produced by 25 at the outputs of the phase-shifting unit and the delay elements, to the outputs of the corresponding control driver formers, is provided by a pulse distributor made on the same elements as 30

deni The inputs of the coincidence elements receive pulses from the phase-shifting block of the delay elements, and the other inputs of these elements are fed by a terminal from the synchronous matching block. Such a construction of the system complicates it as a whole, reduces its reliability, increases the weight and dimensions and cost due to the large number of components.

The purpose of the invention is to simplify the health and increase its reliability in operation.

This is achieved by the fact that in a single-drop device for controlling a multiphase valve converter containing a phase-shifting unit, the output of which is connected to the inputs of the first delay element, the output connected to the input of the second delay element, the phase-shifting unit is designed as a series-connected phase shifter and a slower edge, whose output , h also the outputs of the delay devices and the switches to the inputs of the corresponding control driver drivers.

Soldering the phase-shifting unit in the form of successively connected phase shifters and a snoozer is limited. It allows, using delay elements, repeating the output pattern in the form of a nair

the amplifier limiter, exclude the pulse distributor and the phase matching module.

FIG. 1 is a block diagram of a single-channel device for controlling a converter; in fig. 2 - time diagrams of operation of the control device.

The control device comprises a phase shifter 1, consisting of a phase shifter 2 and the amplifier-limiter 3, a voltage of the phase shifter, delay elements 4 and 5, a driver 6-I of the control pulses of the converter valves.

The valve converter is powered by a three-phase voltage system 12, the lithium voltage 13 (L / iz) of which is fed to the input of the phase shifter 2. The output sinusoidal voltage 14 of the phase shifter may change the phase relative to the voltage 13 depending on the control voltage value (Uy) at the required angle (a). The voltage 14 is fed to the input of the amplifier-limiter 3, which converts it to a rectangular voltage 15, the fronts of which correspond to the moments of transition through a zero voltage 14. The voltage 15 is fed simultaneously to the inputs of the formers 6 and 7 of control pulses and to the input delay element 4, the output of which is connected to the input of a similar delay element 5. The outputs of the formers 6 and 7 produce control pulses of the gates of the same phase of the converter. The delay element 4 provides a voltage delay of 15 at an angle

- (voltage 16) and delay element 5 3

provides a voltage delay of 16 at the same angle (voltage 17). Voltage 16 is fed to the inputs of the formers 8 and 9 of the controllers of impellers of the 3rd phase, and voltage 17 is supplied to the inputs of the formers 10, AND of the control pulses of the 2nd phase converters of the converter. The formers 6, 8 and 10 produce control emulsions for the valves of the transformer in momeites, corresponding to the leading fronts of voltages 15-17.

5 The formers 7, 9, and 11 produce control pulses for the converter valves at times corresponding to the leading edges of voltages 15-17. The time diagrams and dashed lines show the voltage 15-17 at the control angle a 0.

Using current circuit solutions based on modern elemental base allowed us to perform the proposed one-channel device for controlling a valve converter, which is simpler due to the exclusion of a device for distributing pulses and a synchronizing device for phase matching.

0 to increase the reliability and mass-dimensional indicators.

Claims (2)

1. USSR Author's Certificate No. 272423, cl. H 02 P 13/16, 1967. 2. Yesterday V.P. Odnokaialiye control systems of multiphase valve converters. Electrical Industry. Seri "Converting technique, vol. 7, 1970. to valve g preo5 vue 7 /R / 2 / 1-. FIG. 2