High power switching amplifier wherein energy is transferred to a tuned circuit during both half cycles

Claim 1

IN COMBINATION, A TUNED FREQUENCY SELECTIVE NETWORK PROVIDING A RELATIVELY LOW IMPEDANCE TO CURRENT FLOW AT PREDETERMINED FREQUENCIES WHILE PROVIDING A HIGH IMPEDANCE TO HARMONIC CURRENT FLOW; A PLURALITY OF SEMICONDUCTOR MEANS CONNECTED AT OPPOSITE ENDS OF SAID NETWORK FOR ALTERNATELY CHARGING SAID NETWORK TO A VOLTAGE IN ONE CURRENT DIRECTION DURING A FIRST PERIOD OF OPERATION AND THEN SUBSTANTIALLY DISCHARGING SAID VOLTAGE AND CHARGING TO ANOTHER VOLTAGE IN AN OPPOSITE CURRENT DIRECTION DURING A SECOND PERIOD OF OPERATION; DRIVER MEANS SUPPLYING AN INPUT CURRENT TO BOTH OF SAID PLURALITY OF SEMICONDUCTOR MEANS RENDERING EACH OF SAID SEMICONDUCTOR MEANS SELECTIVELY CONDUCTIVE DURING SAID FIRST AND SAID SECOND PERIOD OF OPERATION AT A RATE SUBSTANTIALLY EQUAL TO SAID PREDETERMINED FREQUENCIES IN A MANNER TO PROVIDE THE MINIMUM POSSIBLE INTERNAL RESISTIVE IMPEDANCE TO CURRENT FLOW DURING SAID FIRST AND SAID SECOND PERIOD OF OPERATION; AND LOAD MEANS COUPLED TO SAID NETWORK FOR PROVIDING AN OUTPUT SIGNAL IN ACCORDANCE WITH THE CHARGING AND DISCHARGING OF SAID TUNED FREQUENCY SELECTIVE NETWORK.