Inverter circuits for producing an a. c. output from a d.c. source using semiconductor controlled rectifiers

Claim 1

AN INVERTER COMPRISING IN COMBINATION A D.C. SOURCE, FIRST AND SECOND TERMINALS CONNECTED TO THE D.C. SOURCE, A SATURABLE CORE, FIRST AND SECOND WINDINGS ON THE CORE AND HAVING A POINTS INTERMEDIATE THEIR ENDS CONNECTED TO THE FIRST AND SECOND TERMINALS RESPECTIVELY, A PAIR OF SWITCHABLE RECTIFIERS THROUGH THE ANODES AND CATHODES OF WHICH THE ENDS OF SAID FIRST WINDING ARE CONNECTED TO THE SECOND TERMINAL RESPECTIVELY, EACH OF SAID SWITCHABLE RECTIFIERS BEING SWITCHED ON BY A POSITIVE PULSE APPLIED BETWEEN ITS GATE AND CATHODE, AND BEING SWITCHED OFF BY A NEGATIVE PULSE APPLIED BETWEEN ITS GATE AND CATHODE, A PAIR OF CAPACITORS THROUGH WHICH THE ENDS OF THE SECOND WINDING ARE CONNECTED TO THE GATES OF THE SWITCHABLE RECTIFIERS RESPECTIVELY, A PAIR OF RESISTORS THROUGH WHICH THE GATES OF THE SWITCHABLE RECTIFIERS ARE CONNECTED TO THE SECOND TERMINAL RESPECTIVELY AND AN OUTPUT WINDING ASSOCIATED WITH SAID CORE, CONDUCTION OF ONE OF SAID SWITCHABLE RECTIFIERS SERVING TO MAGNETISE THE CORE IN ONE DIRECTION AND MAINTAIN THE OTHER SWITCHABLE RECTIFIER NON-CONDUCTIVE, AND SATURATION OF SAID CORE RESULTING IN REVERSING THE CONDUCTIVITIES OF SAID SWITCHABLE RECTIFIERS SO THAT THE CORE IS MAGNETISED IN THE OPPOSITE DIRECTION, AN A.C. SIGNAL BEING PRODUCED IN SAID OUTPUT WINDING.