THREE-PHASE REGULATED CONVERTER OF ALTERNATING VOLTAGE INTO DIRECT VOLTAGE Russian patent published in 2008 - IPC H02M7/10 

FIELD: electricity.

SUBSTANCE: invention resolves the problem of producing three-phase alternating voltage converter into direct voltage being characterised by wide voltage control capabilities in contact circuits as well as high energy indicators at relatively simple design. To resolve this problem, three-phase regulated converter of alternating voltage into direct voltage includes converting transformer with three-phase primary winding coupled in star shape with ends linked to input leads designed to connect supply network, and two three-phase secondary windings, at least, one of them being coupled in star shape. The first valve rectifier and booster transformer having one three-phase primary and two three-phase secondary windings are connected in series in each phase with corresponding secondary windings of converting transformer. Booster transformer secondary winding is connected to each phase of star-coupled secondary winding of converting transformer. Controlled reactor is coupled in series with booster transformer secondary winding. Together with booster transformer secondary winding controlled reactor forms a circuit, non-controlled reactor being parallel to the said circuit. Non-controlled reactor winding ends form common points together with ends of circuits containing serial connection of booster transformer secondary winding and controlled reactor winding. According to the invention, it is proposed to introduce another valve rectifier similar to the first one and being in serial connection with it, the both valve rectifiers being designed to connect load. The second secondary winding of booster transformer is to be connected in zigzag pattern and linked with the second secondary winding of converting transformer coupled in triangular manner; each of the two valve rectifiers should be made in the form three-phase bridge. Common connection points of controlled and non-controlled reactors should be coupled with one of bridges; ends of each zigzag coupled secondary winding phase in booster transformer should be linked with controlled reactors while non-controlled reactors should be connected in parallel to circuit of zigzag coupled booster transformer secondary winding and in series to it by controlled reactor winding. In each phase, winding ends of controlled and non-controlled reactors form common point connected with the second valve bridge rectifier.

EFFECT: simplification and improvement of energy indicators.

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