Static inverters

Claim 1

A STATIC INVERTER COMPRISING A TRANSFORMER INCLUDING A PRIMARY WINDING WITH A CENTER TAP AND TWO COMMUTATION WINDINGS, ONE OF THE COMMUTATION WINDINGS IN SERIES WITH ONE END OF THE PRIMARY WINDING AND THE OTHER COMMUTATION WINDING IN SERIES WITH THE OTHER END OF THE PRIMARY WINDING, TWO CAPACITORS FOR COMMUTATION, ONE IN SERIES WITH ONE OF THE TRANSFORMER COMMUTATION WINDINGS AND ONE IN SERIES WITH THE OTHER TRANSFORMER COMMUTATION WINDING, FOUR RESISTORS, ONE IN SERIES WITH EACH OF THE TWO COMMUTATION CAPACITORS FOR REDUCING PEAK CHARGING CURRENT AND ONE IN PARALLEL WITH EACH OF THE TWO COMMUTATION CAPACITORS FOR PROVIDING A DISCHARGE PART SO THAT EACH TIME THE DRIVE SIGNALS ARE APPLIED THE COMMUTATION CAPACITORS WILL BE IN THE DISCHARGED CONDITION, TWO DIODES, EACH ONE IN SERIES WITH ONE OF THE TWO COMMUTATION CAPACITORS FOR PREVENING DISCHARGE OF THE COMMUTATION CAPACITORS UNTIL THE STORED ENERGY IS NEEDED FOR COMMUTATION, THE RESISTORS AND DIODES IN SERIES WITH THE COMMUTATION CAPACITORS BEING INTERPOSED ELECTRICALLY IN THE CIRCUIT BETWEEN THE COMMUTATION CAPACITORS AND THE TRANSFORMER PRIMARY WINDING EXTENDING CENTER TAPE ON THE TRANSFORMER PRIMARY WINDING EXTENDING TO GROUND, TWO SILICON CONTROLLED RECTIFIERS TO ALTERNATELY CONDUCT DIRECT CURRENT POWER TO ONE-HALF OF THE TRANSFORMER PRIMARY WINDING AND THEN TO THE OTHER HALF, TWO SILICON CONTROLLED RECTIFIERS TO CUT OFF THE CONDUCTING SILICON CONTROLLED RECTIFIERS AT A PREDETERMINED TIME, SAID CUT OFF SILICON CONTROLLED RECTIFIERS HAVING THEIR CATHODE ELECTRODES CONNECTED TO THE CATHODE ELECTRODES OF THE CONDUCTING SILICON CONTROLLED RECTIFIERS WHICH THEY CUT OFF AND THEIR ANODE ELECTRODES CONNECTED TO ONE OF THE COMMUTATION CAPACITORS, AN INDUCTOR COIL CONNECTING THE UPPER AND LOWER ENDS OF THE TRANSFORMER PRIMARY WINDING TO A D.C. POWER SUPPLY THROUGH THE TWO CONDUCTING SILICON CONTROLLED RECTIFIERS, SAID INDUCTOR COIL SERVING CONPREVENT CURRENT SPIKES DURING TURN OFF OF THE SILICON CONTROLLED RECTIFIERS AND ALSO PROVIDING AN OSCILLATORY CIRCUIT WITH EACH COMMUTATION CAPACITOR, EACH COMMUTATION CAPACITOR BEING CONNECTED TO THE INDUCTOR COIL AND TO THE ANODE ELECTRODES OF A CONDUCTING SILICON CONTROLLED RECTIFIER AND ITS CUT OFF SILICON CONTROLLED RECTIFIER, AND MEANS PROVIDING A SEPARATE DRIVE PULSE TO TURN ON EACH SILICON CONTROLLED RECTIFIER, SAID DRIVE PULSE TO TURN ON EACH SILICON NECTED TO THE GATE ELECTRODE OF EACH SILICON CONTROLLED RECTIFIER AND TO THE ENDS OF THE PRIMARY WINDING THROUGH CONNECTIONS COMMON TO THE CATHODE ELECTRODE OF EACH CONDUCTING SILICON CONTROLLED RECTIFIER ND ITS CUT OFF SILICON CONTROLLED RECTIFIER.