D.c. to a.c. inverter arrangement

Claim 1

IN A POWER CONVERSION SYSTEM COMPRISING A PLURALITY OF BRIDGE INVERTERS, EACH OF SAID INVERTERS COMPRISING FIRST AND SECOND PARALLEL ARRANGED CIRCUIT LEGS ADAPTED TO BE CONNECTED ACROSS A UNIDIRECTIONAL POTENTIAL SOURCE HAVING A POSITIVE AND NEGATIVE TERMINAL, EACH OF SAID FIRST AND SECOND LEGS COMPRISING A SERIES ARRANGEMENT OF A PLURALITY OF GATE CONTROLLED RECTIFIERS HAVING RESPECTIVE FIRST AND SECOND JUNCTIONS THEREBETWEEN, THE ANODE OF A FIRST GATE CONTROLLED RECTIFIER IN A LEG BEING ADAPTED TO BE CONNECTED TO SAID POSITIVE TERMINAL, THE CATHODE OF A SECOND GATE CONTROLLED RECTIFIER IN A LEG BEING ADAPTED TO BE CONNECTED TO SAID NEGATIVE TERMINAL AND OSCILLATING MEANS FOR ALTERNATELY GATING INTO CONDUCTIVITY COMBINATIONS OF A FIRST AND SECOND GATE CONTROLLED RECTIFIERS OF DIFFERENT LEGS IN AN INVERTER; AN OUTPUT TRANSFORMER FOR PROVIDING THE COMBINED OUTPUTS OF SAID INVERTERS COMPRISING A FIRST PRIMARY WINDING COUPLING SAID FIRST JUNCTIONS, A SECOND PRIMARY WINDING COUPLING SAID SECOND JUNCTIONS, SAID FIRST AND SECOND PRIMARY WINDINGS BEING SO POLED WHEREBY THE OUTPUTS APPEARING THEREIN ARE IN PHASE.