SU661712A1 - Six-cycle pulse shaper - Google Patents

Description

one

The invention relates to electrical engineering and can be used to control three-phase thyristor converters.

Pulse drivers for controlling three-phase bridge converters with narrow twin pulses are known 1. Of the known drivers, the six-stroke pulse generator containing accumulative capacitors with charging resistors connected via keys to pulse transformers with pairs of secondary windings is the closest to the technical essence of the invention. provided with cut-off diodes 2.

This driver has six storage capacitors and six impulse transformers, which, along with the biasing of the transformer cores, leads to an overestimated installed powerful capacity of these elements.

The aim of the invention is to simplify the device by reducing the number of pulse transformers and storage capacitors.

The goal is achieved by the fact that a six-cycle pulse shaper, containing storage capacitors with charging resistors, connected via keys to pulse transformers with pairs of secondary windings having cut-off diodes, is equipped with two additional transistor switches, a reference diode and, according to the number of primary windings of pulse transformers, separation diodes, moreover, pulse transformers are made with two groups of windings wound in the opposite direction, each of which contains the first The primary windings, and the pairs of secondary windings, winding groups of pulse transformers of the same winding direction, form two identical circuits in which the primary windings are connected to a storage capacitor through switches and through shunted diodes through switches. an additional transistor switch, and the control inputs of the additional transistor switches of both circuits are connected to the reference diode.

The drawing shows a schematic diagram of a six-stroke shaper.

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It contains storage capacitors 1, 2 with charging resistors 3, 4, switches 5-10, pulse transformers 11-13, in the secondary windings of which cut-off diodes 14-17 are turned on, and primary windings are shunted by additional switches 8-23, each of which contains two transistors 24, 25 and 26, 27, as well as a reference diode 28.

Shaper works as follows.

In the initial state, in the absence of control signals at the inputs of the keys 5-10, the storage capacitors 1, 2 are charged to the maximum voltage, and the additional transistor switches from the onion diode 28 receive a connecting voltage so that they do not have a shunting effect on the primary windings pulse transformers. When input to one of the keys 5 :: - 10 of the control signal, the corresponding storage capacitor begins to discharge through this key and the primary winding of the impulse transformer. The bias voltage coming from the onion diode to the additional transistor switch connected to the discharge voltage1; the capacitor ceases to be blocking, but this switch does not shunt the primary winding, since this prevents the corresponding separation diode 18-23. After the discharge of the storage capacitor in the windings of the pulse transformer is completed, the ED C is induced with a polarity opposite to that during the discharge of the decondenser, which is caused by relaxation processes in the core of the transformer. In this case, the isolation diode is shifted in the right direction, and the primary winding of the pulse transformer is shunted by the included additional transistor switch. After the storage capacitor is fully charged, the shunting effect of the additional transistor switch is terminated. In this way, the possibility of the occurrence of a signal on the secondary

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windings of pulse transformers at the end of the remagnetization processes of their cores.

The control signals are fed to the key inputs in such a sequence that the storage capacitors are discharged alternately and the cores of the pulse transformers alternately reversal in opposite directions. Along with a reduction in the number of storage capacitors and pulse transformers, an additional reduction in their installed capacity is achieved.

Claims (2)

Invention Formula 5 Six-pulse pulse shaper, contents of accumulative capacitors with charging resistors, connected via keys to pulse transformers with a pair of secondary windings having cut-off diodes, characterized in that, in order to improve the device by saving the number of pulse transformers and accumulative capacitors, it is equipped with two additional transistor Switches, a reference diode and 25 each for the number of primary windings of the pulse transformers - separation diodes, with the pulse The informators are made with two groups of windings, which are self-locking in the opposite direction, each of which contains a primary winding and a pair of secondary windings; the winding groups of pulse transformers of the same winding pattern form two identical circuits, in which the primary windings connect the accumulator JJ capacitor and through dividing diodes they are shunted by a additional transistor switch, and the control inputs of additional transistor switches of both circuits are connected to an on-diode. Source of Information Accepted Externally . USSR Author's Certificate No. 349063, cl. H 02 M 1/02, 1963. 2. Sitnik.N. X. Silova semiconductor technology. M., “Energie, 1968, p. 199, rice 4-28. five