CONVERTER OF THREE-PHASE AC VOLTAGE (VERSIONS) Russian patent published in 2010 - IPC H02M7/162 

FIELD: electricity.

SUBSTANCE: invention relates to conversion equipment and may be used for transformer-free conversion of three-phase AC voltage into 12-pulse voltage, and also transformer conversion into 12-pulse or three-phase AC voltage with quality harmonic composition. According to the first version, converter comprises zero and phased input terminals, three-phase controlled valve bridge, two additional valves. Each pole of specified bridge is connected to extreme terminal of winding of according equalising reactor, another extreme terminal of which is connected to electrode of according additional valve. Additional valves and valves of specified bridge are connected to extreme terminals of one and the same equalising reactor by identical electrodes. Between common point of free electrodes of additional valves and zero input terminal there is a short-circuited connecting circuit arranged. Intermediate terminals of equalising reactor windings form output terminals of specified bridge. Windings of additional three-phase transformer are connected as "star" and are connected by common point of identical terminals to zero input terminal; their free terminals and phase input terminals are connected to input terminals of specified bridge, and intermediate terminal of winding in each equalising reactors divides its number of turns into parts by ratio equal to 1:√3, least of which is calculated from specified additional valves, which when connected at the output of smoothing reactor may be arranged as uncontrolled. According to the second version, converter comprises transformer, tops of delta winding of which are connected to three-phase load, diode bridge or three-phase of power supply source. Its other phased windings are connected by the first group of identical terminals to input terminals of controlled valve bridge, and by the second one - to three-phase source of power supply or zero input terminal.

EFFECT: simplification and improvement of transformation quality.

8 cl, 7 dwg