Control circuits for static inverters

Claim 1

IN A SYSTEM FOR PRODUCING AN ALTERNATING CURRENT OUTPUT AND WHICH INCLUDES: GENERATING MEANS FOR PRODUCING A PAIR OF OPPOSITELY PHASED GATE SIGNALS, AND FIRST AND SECOND MAIN SWITCHING DEVICES COUPLED TO SAID GENERATING MEANS TO BE SEQUENTIALLY ACTUATED BY SAID OPPOSITELY PHASED GATE SIGNALS IN A SUCCESSION OF RECURRENT OPERATING CYCLES, THE COMBINATION OF: A TRANSFORMER INCLUDING A PRIMARY WINDING HAVING FIRST AND SECOND SIDES RESPECTIVELY CONNECTED TO SAID FIRST AND SECOND MAIN SWITCHING DEVICES, SAID PRIMARY WINDING FURTHER HAVING A CENTER TAP AND FIRST AND SECOND INTERMEDIATE TAP DISPOSED ON OPPOSITE SIDES OF SAID CENTER TAP, SAID TRANSFORMER FURTHER INCLUDING A SECONDARY WINDING ACROSS WHICH AN ALTERNATING CURRENT SECONDARY VOLTAGE IS PRODUCED, POTENTIAL SUPPLYING MEANS CONNECTED TO SAID CENTER TAP ON SAID PRIMARY WINDING FOR INTRODUCING AN EXCITING POTENTIAL THERETO, CIRCUIT MEANS COUPLED TO SAID TRANSFORMER FOR DERIVING A REGULATING SIGNAL REPRESENTATIVE OF SAID AMPLITUDE OF SAID ALTERNATING CURRENT SECONDARY VOLTAGE, FIRST AND SECOND AUXILIARY SWITCHING DEVICES CONNECTED RESPECTIVELY TO SAID FIRST AND SECOND MAIN SWITCHING DEVICES AND TO SAID FIRST AND SECOND INTERMEDIATE TAPS ON SAID PRIMARY WINDING, AND A CONTROL CIRCUIT COUPLED TO