Inverter with tuned circuit frequency control

Claim 1

A STATIC INVERTER CIRCUIT COMPRISING: AT LEAST ONE PAIR OF SUBSTANTIALLY UNIDIRECTIONAL CURRENT CONDUCTING DEVICES EACH HAVING AT LEAST ONE ELEMENT FOR CONTROLLING THE MAGNITUDE OF THE CURRENT FLOW THROUGH IT; AN OUTPUT TRANSFORMER HAVING PRIMARY AND SECONDARY WINDINGS; CIRCUIT MEANS FOR ALTERNATELY ENERGIZING SAID PRIMARY WINDING OF SAID OUTPUT TRANSFORMER WITH CURRENT IN A FIRST DIRECTION FROM ONE OF SAID DEVICES AND WITH CURRENT IN THE OPPOSITE DIRECTION FROM THE OTHER OF SAID DEVICES; LOAD MEANS CONNECTED TO SAID SECONDARY WINDING OF SAID OUTPUT TRANSFORMER; A RESONANT CIRCUIT; MEANS FOR ELECTROMAGNETICALLY COUPLING EXCITATION CURRENT FROM SAID PRIMARY WINDING OF SAID OUTPUT TRANSFORMER INTO SAID RESONANT CIRCUIT, SAID COUPLING MEANS COMPRISING AT LEAST ONE WINDING ON SAID OUTPUT TRANSFORMER, WITH THE NUMBER OF TURNS ON BOTH SAID COUPLING MEANS WINDING AND THE SECONDARY WINDING OF SAID OUTPUT TRANSFORMER PROVIDING A VOLTAGE STEP-DOWN FOR PREVENTING THE REFLECTION OF LOAD VARIATIONS INTO SAID RESONANT CIRCUIT; AND MEANS FOR COUPLING THE SIGNALS GENERATED BY SAID RESONANT CIRCUIT TO SAID CONTROL ELEMENTS OF SAID DEVICES FOR ALTERNATELY CONTROLLING THE CURRENT CONDUCTION AND NONCONDUCTION OF SAID DEVICES WHEREBY THE VOLTAGE APPEARING AT SAID LOAD MEANS WILL RECUR AT THE SAME FREQUENCY AS THE RESONANT FREQUENCY OF SAID RESONANT CIRCUIT.