Self-controlled inverter with series connected condenser in load circuit

Claim 1

IN A SELF-CONTROLLED INVERTER FOR INVERTING A DIRECT CURRENT INPUT TO AN ALTERNATING CURRENT OUTPUT AT AN INTERMEDIATE FREQUENCY, THE COMBINATION COMPRISING A PLURALITY OF GRID-CONTROLLED VALVES OF THE MERCURY VAPOR TYPE CONNECTED TO A DIRECT CURRENT INPUT CIRCUIT AND TO AN INCLUDING TYPE ALTERNATING CURRENT OUTPUT LOAD CIRCUIT INCLUDING A CONDENSER AND A CURRENT TRANSFORMER IN SERIES THEREWITH, UNCONTROLLED VALVES SUCH AS GAS DISCHARGE VALVES, SEMI-CONDUCTOR VALVES OR THE LIKE INDIVIDUAL TO SAID GRID-CONTROLLED VALVES AND CONNECTED ANTI-PARALLEL THEREWITH, THE INDUCTIVE AND CAPACITATIVE RECTANCE VALUES OF SAID SERIES CONNECTED LOAD AND CONDENSER RESPECTIVELY BEING SUCH AS TO ESTABLISH A SERIES RESONANT OSCILLATORY CIRCUIT HAVING AN ATTENUATION BELOW THE APERIODIC DAMPING AND WHICH POSSESSES AN OSCILLATION PERIOD SMALLER THAN THAT OF THE ALTERNATING CURRENT OUTPUT AND A CONTROL DEVICE FOR PRODUCING PERIODIC VOLTAGE IMPULSES TRANSMITTED OVER CIRCUIT MEANS TO THE GRIDS OF SAID GRID CONTROLLED VALVES IN SEQUENCE AND AT A FREQUENCY CORRESPONDING TO THE INTERMEDIATE FREQUENCY DESIRED FOR THE ALTERNATING CURRENT OUTPUT TO EFFECT A CORRESPONDING PERIODIC REVERSAL OF THE CURRENT FLOW THROUGH SAID LOAD CIRCUIT, SAID SECONDARY OF SAID CURRENT TRANSFORMER BEING CONNECTED TO AND CONTROLLING THE OPERATION OF SAID CONTROL DEVICE SUCH THAT ONLY THE INSTANT OF PASSAGE THROUGH ZERO OF SAID LOAD CURRENT OF EACH HALF PERIOD OF LOAD CURRENT FLOW THROUGH ONE OF SAID GRID CONTROL VALVES DETERMINES THE INSTANT AT WHICH SAID CONTROL VALVES PRODUCES ITS NEXT VOLTAGE IMPULSE OUTPUT TO ANOTHER GRID CONTROLLED VALVE WHICH IS NEXT TO CONDUCT.