SU133946A1 - Semiconductor converter of direct current to three-phase current - Google Patents

Description

Semiconductor converters of direct current to three-phase current are known, made on switching transistors. The latter are electrically interconnected by means of additional windings on the output transformers in the ring crossover circuit and are synchronized from the common master oscillator.

The proposed converter differs from the known ones in that transistors are connected in a three-phase bridge circuit, and the synchronization voltage from the master oscillator is fed in one polarity to the bases of three transistors with combined emitters and in opposite polarity to the bases of the other three transistors with combined collectors through winding sections positive feedback and the winding of the communication between the cascades connected in opposite with them.

Such an embodiment of the converter makes it possible to apply it at a supply voltage close to the maximum voltage of the transistors.

The proposed invention makes it possible to reduce the weight and overall dimensions of the converter due to the better use of the transformer active materials.

The transformer of the converter is made three-phase and, together with transistors, forms a generator with a three-phase voltage system at the output. This makes it possible to further reduce the size and weight of the converter.

The drawing shows a diagram of the proposed Converter.

The six triodes of the TI-Ge converter are connected via a three-phase bridge circuit. The converter contains transformers Tpi, Tpz, Грз, the primary windings W of which are connected to the output terminals of the bridge. In addition, the transformer has on each phase an output number 133946-2 for the coil Wz, the winding Ws and the positive feedback and the winding Wf, and We for the connection between the stages.

The windings, 6 connections between the cascades and the output windings W, Ws, Wg, of the transformer Trp of the master oscillator form a matching circuit. One transformer phase and two transistors connected to the primary phase winding constitute a cascade. The three stages of the converter are connected by means of the windings of the connection Ws and We are connected to a scaling ring.

Thus, the converter is a three-stage regenerative system containing three interconnected generators.

The necessary switching of the transistors is carried out in the sequence TI-Ge-T-T2-T -T -Y. This creates a symmetrical system of three voltages, since the bases of three transistors with combined emitters are connected through sections of the feedback windings and the diodes with the beginnings of connection windings between cascades, and the bases of three transistors with combined collectors are connected through similar elements with the ends of the connection windings. The bases of three transistors with combined emitters receive a synchronizing voltage from a master oscillator of one polarity, and a synchronizing voltage of opposite polarity arrives at the bases of transistors with combined collectors.

The impulse from the master oscillator switches in one of the stages, as a result of which an open transistor is locked, to the base of which is supplied plus the total voltage of the communication winding and the output winding of the master oscillator. In this case, the frequency of the output voltage of the converter is one third of the frequency of the master oscillator. The windings and the feedback winding sections connected in series have the same number of turns. The voltage on the output winding of the master oscillator is equal to the voltage on the communication winding between the stages.

Subject invention

Claims (2)

1. Semiconductor converter of direct current to three-phase current, made on switching transistors, electrically connected to each other by means of additional windings on output transformers in a ring scaling circuit and synchronized from a common master oscillator, characterized by the fact that for the purpose of applying a converter with voltage supply network, close to the maximum voltage of transistors, and reducing the weight and overall dimensions of the converter due to the better use of active materials transformer catches, transistors are connected in a three-phase bridge circuit, and the synchronization voltage from the master oscillator is supplied in one polarity to the bases of three transistors with combined emitters and in opposite polarity to the bases of the other three transistors with combined collectors through positive winding sections and communication windings between cascades connected in opposite to it. 2. The converter according to claim 1, characterized in that, in order to further reduce the size and weight of the converter, its transformer is made three-phase and, together with transistors, forms a generator with a three-phase voltage system at the output. Tr, 00+ l / urllll / hr tr I C) (-1 p J U L