Inverters using controlled semiconductor rectifiers

Claim 1

AN INVERTER COMPRISING: AT LEAST ONE PAIR OF PUSHPULL CONNECTED, CONTROLLED SEMICONDUCTOR RECTIFIERS EACH HAVING A MAIN CURRENT CIRCUIT AND A CONTROL ELECTRODE, THE MAIN CURRENT CIRCUITS BEING CONNECTED TO A D.C. SUPPLY CIRCUIT IN SERIES WITH A RESONANT CIRCUIT WITH A AND CAPACITIVE PORTIONS AND HAVING SERIES RESONANCE PROPERTIES, MEANS FOR COUPLING SAID RESONANT CIRCUIT WITH A LOAD CIRCUIT, A SEPARATE PULSE GENERATOR HAVING AT LEAST TWO OUTPUTS RESPECTIVELY CONNECTED TO THE CONTROL ELECTRODES OF THE RECTIFIERS FOR ALTERNATELY APPLYING CONTROL PULSES TO SAID CONTROL ELECTRODES TO RENDER THE RECTIFIERS ALTERNATELY CONDUCTING WITH A REPETITION FREQUENCY OF LESS THAN TWICE THE RESONANCE FREQUENCY OF THE RESONANT CIRCUIT, THE INDUCTIVE PORTION OF THE RESONANT CIRCUIT CONSISTING OF AN INDUCTOR CONNECTED IN SAID COMMON SUPPLY CIRCUIT OF THE TWO RECTIFIERS AND OF A TRANSFORMER HAVING TWO IDENTICAL WINDINGS, EACH WINDING BEING CONNECTED IN THE MAIN CURRENT CIRCUIT OF ONE OF THE RECTIFIERS AND HAVING AN INDUCTANCE SUBSTANTIALLY EQUAL TO AND NO GREATER THAN HALF THE TOTAL INDUCTANCE OF THE RESONANT CIRCUIT, THE VOLTAGE PULSES PRODUCED ACROSS THE INDUCTOR AT THE IGNITION AND AT THE CUT-OFF OF ONE OF THE RECTIFIERS AND EFFECTIVE IN THE MAIN CURRENT CIRCUIT OF THE OTHER RECTIFIER BEING SUBSTANTIALLY COMPENSATED BY CORRESPONDING VOLTAGE PULSES INDUCED IN THE ASSOCIATED WINDING OF THE TRANSFORMER.