THREE-PHASE AC-TO-DC VOLTAGE TRANSDUCER (VERSIONS) Russian patent published in 2008 - IPC H02M7/162 

FIELD: electricity.

SUBSTANCE: transducer contains neutral input pin, main three-phase controlled gate bridge, main paralleling reactors, main additional isolators, main two-terminal network, three-phase transformer, primary phase windings of which are connected by one terminals to input pins of this bridge, and by the others to phase input pins, secondary winding is star connected to neutral pin and connected by phase terminals to input pins of secondary gate bridge with blank input pin poles of which form its output pins. Additionally transducer contains N-1 (where N=2,3,4,…) pin groups of three-phase transformer primary winding connected i-th from specified N-1 pin groups from winding with turn number w_i counted from phase input pins to input pins i-th from N-1 additional three-phase controlled gate bridges similarly connected to N-1 pairs of paralleling reactor and additional gates, to input pins N-1 of additional two-terminal networks with common point of output pins connected to output pin of main two-terminal network. Input pin of the latter is connected to common point of main additional isolators. All additional isolators connected to two-terminal networks are diodes. Coupling chain on secondary side of three-phase transformer is short-circuited and on primary one contains winding connected as open delta with turn number less than turn number of the greatest segment of primary winding between its adjacent pin groups. Turn number of primary winding, from which i-th tap is provided, is equal to w_i And intermediate pin of paralleling reactor winding of each bridge divides its turn number to parts in ratio where: i=1,2,3,…, N is bridge sequence number; k=f(i)=2i-1,…,2N-1 is coefficient. If N=1, main two-terminal network is short-circuited, loading is connected between output pins of primary or/and secondary gate bridge, and blank output pins are short-circuited.

EFFECT: easy-to-control and high-quality transformation of three-phase AC-to-DC voltage with constant harmonic composition and inverse relationship of consumption current high harmonic amplitudes and thyristor activation angle.

6 cl, 12 dwg