Electric charging systems

Claim 1

IN A CHARGING APPARATUS FOR A CHARGED LOAD DEVICE SUCH AS A CAPACITANCE HAVING TWO OPPOSITE-POLARITY LOAD LEADS THROUGH WHICH IS TO BE MAINTAINED CHARGED WITH A DIRECT-CURRENT CHARGE AT A SELECTED DIRECT-CURRENT CHARGE LEVEL WITH ENERGY SUPPLIED BY AN ELECTRIC DIRECT-CURRENT SUPPLY SOURCE; A TRANSISTOR AMPLIFIER COMPRISING A TRANSISTOR HAVING A COMMON ELECTRODE, AN INPUT ELECTRODE AND AN OUTPUT ELECTRODE; AN INPUT CIRCUIT HAVING AN INPUT IMPEDANCE CONNECTED BETWEEN SAID COMMON ELECTRODE AND SAID INPUT ELECTRODE; AND AN OUTPUT TRANSFORMER HAVING A MAGNETIC CORE AND PRIMARY AND SECONDARY WINDINGS INTERLINKED WITH SAID CORE; SAID PRIMARY WINDINGS BEING CONNECTED BETWEEN SAID COMMON ELECTRODE AND SAID OUTPUT ELECTRODE; CIRCUIT MEANS FOR SERIALLY CONNECTING SAID SUPPLY SOURCE BETWEEN SAID COMMON ELECTRODE AND SAID PRIMARY WINDINGS FOR SUPPLYING DIRECT-CURRENT TO THE TRANSISTOR CIRCUITS; AND A FEEDBACK CIRCUIT INCLUDING SAID SECONDARY WINDINGS, JUNCTION RECTIFIER MEANS AND SAID OPPOSITE-POLARITY LOAD LEADS AND BEING CONNECTED ACROSS AT LEAST A PART OF SAID INPUT IMPEDANCE FOR FEEDING BACK AMPLIFIED SIGNALS FROM SAID SECONDARY WINDINGS TO SAID INPUT CIRCUIT AND THEREBY MAINTAINING SUSTAINED OSCILLATIONS IN SAID TRANSISTOR CIRCUITS AND FOR SUPPLYING RECTIFIED OSCILLATION CHARGES FROM SAID SECONDARY WINDINGS TO SAID LOAD LEADS; SAID SECONDARY WINDINGS HAVING AT LEAST ONE CONDUCTIVE CONNECTION TO SAID INPUT ELECTRODE; SAID FEEDBACK CIRCUIT BEING RESPONSIVE TO FLOW OF RECTIFIED OSCILLATION CHARGES FROM SAID SECONDARY WINDING TO SAID LOAD LEADS FOR MAINTAINING SAID SUSTAINED OSCILLATIONS WHILE RECTIFIED CHARGES FLOW THROUGH SAID LOAD LEADS AND TO STOP SAID SUSTAINED OSCILLATIONS IN RESPONSE TO RECTIFIED CHARGES CEASING TO FLOW THROUGH SAID LOAD LEADS UPON THE VOLTAGE BETWEEN SAID LOAD LEADS REACHING A SELECTED VOLTAGE LEVEL.