Resonant inverter drive circuit with precharging means

Claim 1

IN AN INVERTER NETWORK, A PAIR OF TERMINALS ADAPTED TO BE ENERGIZED FROM A SOURCE OF DIRECT POTENTIAL ENERGY, A PAIR OF LOAD SUPPLYING TERMINALS ADAPTED TO BE CONNECTED TO AN ALTERNATING POTENTIAL LOAD, SWITCHING MEANS HAVING A MAIN CURRENT CIRCUIT AND AN ELECTRICALLY ENERGIZABLE CONTROL CIRCUIT FOR CONTROLLING THE INITIATION OF CURRENT FLOW THROUGH ITS SAID MAIN CURRENT CIRCUIT, AN ELECTRICAL ENERGY CONDUCTING NETWORK CONNECTING SAID PAIRS OF TERMINALS FOR FLOW OF ENERGY BETWEEN SAID PAIRS OF TERMINALS AND INCLUDING SAID MAIN CURRENT CIRCUIT OF SAID SWITCHING MEANS, CONDUCTION OF SAID MAIN CURRENT CIRCUIT OF SAID SWITCHING MEANS INITIATING ENERGY FLOW THROUGH SAID ENERGY CONDUCTING NETWORK, A PAIR OF CONTROL-POTENTIAL TERMINALS, MEANS COUPLING SAID CONTOL TERMINALS TO SAID ENERGY CONDUCTING NETWORK FOR ENERGIZATION AS A CONSEQUENCE OF SAID ENERGY FLOW THROUGH SAID ENERGY CONDUCTING NETWORK, A SELF-OSCILLATING OSCILLATORY CIRCUIT INCLUDING INDUCTANCE AND CAPACITANCE INTERCONNECTED TOGETHER FOR RESONANT FLOW OF ENERGY THEREBETWEEN AT A FREQUENCY PRIMARILY DETERMINED BY SAID INDUCTANCE AND SAID CAPACITANCE, SAID OSCILLATORY CIRCUIT HAVING OUTPUT CONNECTIONS WHICH ARE PULSATINGLY ENERGIZED AT THE FREQUENCY OF SAID RESONANT FLOW OF ENERGY, MEANS CONNECTING SAID OUTPUT CONNECTIONS TO SAID CONTROL CIRCUIT OF SAID SWITCHING MEANS TO INITIATE CURRENT FLOW IN SAID MAIN CURRENT CIRCUIT OF SAID SWITCHING MEANS TO ENERGIZE SAID LOAD SUPPLYING TERMINALS AT THE RESONANT FREQUENCY OF SAID OSCILLATORY CIRCUIT, MEANS CONNECTING SAID OSCILLATORY CIRCUIT TO SAID CONTROL-POTENTIAL TERMINALS FOR SUPPLYING ENERGY THERETO, AND ENERGY SUPPLYING MEANS PRECHARGING AT LEAST A PORTION OF SAID CAPACITANCE TO A PREDETERMINED POTENTIAL DURING THE NON-RESONANT CONDITION OF SAID OSCILLATORY CIRCUIT, SAID PRECHARGING MEANS BEING SEPARATE FROM SAID MEANS WHICH CONNECTS SAID OSCILLATORY CIRCUIT TO SAID CONTROLPOTENTIAL TERMINALS.