Inverter commutating capacitor charging system

Claim 1

IN A PULSE WIDTH MODULATED INVERTER HAVING A PAIR OF CONTROLLED RECTIFIERS ADAPTED TO BE CONTROLLED BY A THIRD RECTIFIER AND MEANS FOR CYCLICALLY AND ALTERNATELY FIRING SAID CONTROLLED RECTIFIERS, THE IM PROVEMENT COMPRISING: A SOURCE OF DIRECT CURRENT HAVING AN ACTIVE TERMINAL AND A RETURN TERMINAL, A TRANSFORMER HAVING A SECONDARY AND A PRIMARY WINDING, SAID PRIMARY WINDING SPLIT INTO A FIRST PRIMARY WINDING PORTION AND A SECOND PRIMARY WINDING PORTION, SAID WINDING PORTIONS HAVING A COMMON CENTER POINT, A FIRST CONTROLLED RECTIFIER CONNECTED IN A SERIES CIRCUIT RELATIONSHIP BETWEEN SAID FIRST WINDING PORTION AND SAID RETURN TERMINAL, A SECOND CONTROLLED RECTIFIER CONNECTED IN A SERIES CIRCUIT RELATIONSHIP BETWEEN SAID SECOND WINDING PORTION AND SAID RETURN TERMINAL, A FIRST INDUCTOR ELECTRICALLY CONNECTED TO SAID COMMON CENTER POINT AND SAID ACTIVE TERMINAL, A COMUTATOR CAPACITOR COMBINATION HAVING A FIRST AND SECOND CAPACITOR CONNECTED IN SERIES CIRCUIT RELATIONSHIP, SAID CAPACITOR COMBINATION ELECTRICALLY CONNECTED ACROSS SAID TRANSFORMER PRIMARY WINDING, A THIRD CONTROLLED RECTIFIER ELECTRICALLY CONNECTED TO SAID RETURN TERMINAL AND THE POINT ELECTRICALLY COMMON TO SAID FIRST AND SECOND CAPACITORS, A SERIES CIRCUIT COMBINATION COMPRISING A DIODE AND AN IMPEDANCE ELECTRICALLY CONNECTED IN SERIES, AND SAID SERIES CIRCUIT COMBINATION ELECTRICALLY CONNECTED TO SAID RETURN TERMINAL AND SAID POINT COMMON TO SAID FIRST AND SECOND CAPACITORS.