Rectifier inverter circuits with controlled rectifiers and saturable inductance means

Claim 1

AN INVERTER CIRCUIT COMPRISING A POLYPHASE ALTERNATING CURRENT NETWORK FUNCTIONING AS A LOAD, A SOURCE OF DIRECT CIRCUIT, AT LEAST TWO GROUPS OF CONTROLLED SEMICONDUCTOR RECTIFIERS CONNECTED IN A SINGLE PATH ARRANGEMENT CONNECTING SAID POLYPHASE AND DIRECT CURRENT SOURCES, COMPENSATING INDUCTORS INCLUDING, COIL WINDINGS INTERCONNECTED BETWEEN SAID RECTIFIERS AND SAID POLYPHASE SOURCE, AND SATURABLE MAGNETIC COUPLING MEANS BETWEEN EACH OF SAID COIL WINDINGS OF ONE OF SAID GROUPS OF RECTIFIERS AND THE PARTICULAR COIL WINDING OF THE OTHER GROUP OF RECTIFIERS WHICH CORRESPONDS TO AMPERE-TURNS IN THE OPPOSITE SENSE IN SAID POLYPHASE SOURCE, THE DIRECTION OF SAID MAGNETIC COUPLING BEING ARRANGED SO THAT AN INCREASE IN THE NORMAL DIRECT CURRENT PASSING THROUGH THE COIL WINDING OF ONE OF SAID GROUPS OF RECTIFIERS INDUCES A VOLTAGE IN THE COUPLED COIL WINDING OF THE OTHER GROUP OF SAID RECTIFIERS WHICH TENDS TO CAUSE A CURRENT TO CIRCULATE IN IT IN THE OPPOSITE DIRECTION TO THAT OF ITS NORMAL DIRECT CURRENT, AND THE MUTUAL INDUCTANCE OF THE TWO COUPLED COIL WINDINGS BEING SUBSTANTIALLY EQUAL, FOR ZERO CURRENTS, TO THE MUTUAL INDUCTANCE BETWEEN THE INTERNAL INDUCTANCES OF THE TWO CORRESPONDING PHASES OF SAID POLYPHASE SOURCE.