Inverter circuitry using controlled rectifiers

Claim 1

IN AN ELECTRICAL INVERTER SYSTEM, A SOURCE OF UNIDIRECTTIONAL INPUT VOLTAGE; A PLURALITY OF CONTROLLED RECTIFIERS; A NONLINEAR TRANSFORMER HAVING FIRST AND SECOND MAGNETIC PATHS OF PREDETERMINED HYSTERESIS-LOOP CHARACTERISTICS; MEANS FOR CYCLICALLY SWITCHING ON AND OFF THE CONTROLLED RECTIFIERS SO AS TO CYCLICALLY CONNECTED SAID SOURCE OF UNIDIRECTIONAL INPUT VOLTAGE ACROSS THE PRIMARY SIDE OF SAID NONLINEAR TRANSFORMER WHEREBY TO CAUSE THE DIRECTION OF FLUX MOVEMENT WITH SAID TRANSFORMER TO ALTERNATE; MEANS FOR TURNING OF EACH CONDUCTING RECTIFIER AFTER A PREDETERMINED INTERVAL OF CONDUCTION SUCH THAT DURING ANY HALF CYCLE ANY CONDUCTING CONTROLLED RECTIFIER IS RETURNED TO THE NONCONDUCTING STATE WITHOUT DEPENDENCE UPON THE TURNING ON OF ANY OTHER CONTROLLED RECTIFIER, SAID MEANS FOR TURNING OFF THE CONTROLLED RECTIFIERS MAKING USE OF SAID FIRST AND SECOND MAGNETIC PATHS WITHIN SAID NONLINEAR TRANSFORMER; PRIMARY WINDING MEANS ENCIRCLING BOTH OF SAID MANGETIC PATHS AND LOAD WINDING MEANS ENCIRCLING BOTH OF SAID MAGNETIC PATHS SUCH THAT BOTH CURRENTS FLOWING IN SAID PRIMARY WINDING MEANS AND CURRENTS FLOWING IN SAID LOADING WINDING MEANS APPLY A MAGNETOMOTIVE FORCE TO EACH OF SAID PATHS WHEREBY DURING EACH HALF CYCLE IN FLUX CHANGE IS CAUSED TO OCCUR, SAID FLUX CHANGE OCCURRING PREDOMINATELY IN SAID FIRST MAGNETIC PATH UNTIL SAID FIRST PATH BECOMES SATURATED AND THEREAFTER OCCURRING PREDOMINATELY IN SAID SECOND MAGNETIC PATH; AUXILIARY WINDING MEANS EQUAL IN NUMBER TO THE NUMBER OF CONTROLLED RECTIFIERS AND ONE SUCH AUXILIARY WINDING MEANS BEING ASSOCIATED WITH EACH CONTROLLED RECTIFIER, SAID AXUILIARY WINDING MEANS ENCIRCLING ONLY SAID SECOND PATH; A CAPACITOR CONNECTED IN SERIES CIRCUIT WITH EACH SAID AUXILIARY WINDING MEANS AND ONE SUCH SERIES CIRCUIT BEING USED WITH EACH CONTROLLED RECTIFIER TO FORM AN ELECTRICAL PATH IN PARALLEL WITH THE ANODE-CATHODE PATH OF THE CONTROLLED RECTIFIER, SAID SERIES CIRCUITS BEING ARRANGED AND OPERTIVE TO TRANSIENTLY APPLY A NEGATIVE TURN-OFF VOLTAGE ACROSS ANY CONTROLLED RECTIFER WHICH IS IN THE CONDUCTING STATE AT THE BEGINNING OF SAID SECOND PATH FLUX CHANGE WHEREBY SUCH CONDUCTING CONTROLLED RECTIFIER WILL BE RETURNED TO THE NONCONDUCTING STATE; SAID INVERTER SYSTEM BEING OPERATIVE TO ACCEPT ELECTRICAL ENERGY FROM A DIRECT-VOLTAGE SOURCE AND TO SUPPLY ELECTRICAL ENERGY FROM SAID LOAD WINDING IN THE FORM OF ALTERNATING CURRENT AND VOLTAGE AT A FREQUENCY WHICH MAY BE PREDETERMINED BY VERTER ARE TURNED ON AND OFF.