Full-wave differential control circuit employing single saturable core transformer

Claim 1

A DIFFERENTIAL CONTROL CIRCUIT OF THE TYPE PRODUCING FIRST AND SECOND OUTPUT SIGNALS DIFFERNTIALLY REFERENCED TO A COMMON OUTPUT TERMINAL COMPRISING FIRST AND SECOND CONTROL CIRCUITS EACH COMPRISING A LIKE-WOUND CONTROL WINDING ON A SATURABLE CORE MEMBER COMMON TO EACH OF SAID CONTROL WINDINGS; A LOAD CIRCUIT COMPRISING A COMMON DIRECT CURRENT VOLTAGE SOURCE INCLUDING A COMMON TERMINAL, FIRST AND SECOND LIKE-WOUND LOAD WINDINGS WOUND ON SAID SATURABLE CORE MEMBER, SAID LOAD WINDINGS BEING OPPOSITELY POLARIZED WITH RESPECT TO SAID CONTROL WINDINGS, MEANS CONNECTING FIRST ENDS OF SAID LOCAL WINDINGS THROUGH SAID DIRECT CURRENT VOLTAGE SOURCE TO SAID COMMON OUTPUT TERMINAL, THE OTHER ENDS OF EACH OF SAID LOAD WINDINGS BEING RESPECTIVELY CONNECTED TO THE EMITTER ELEMENTS OF FIRST AND SECOND TRANSISTORS, THE BASE ELEMENTS OF SAID FIRST AND SECOND TRANSISTORS BEING RESPECTIVELY CONNECTED TO OPPOSITELY POLARIZED ENDS OF SAID FIRST AND SECOND CONTROL WINDINGS, THE OTHER ENDS OF SAID CONTROLS WINDINGS BEING CONNECTED THROUGH FIRST AND SECOND CONTROL RESISTANCE MEMBERS TO THE JUNCTION BETWEEN SAID OUTPUT WINDINGS, THIRD AND FOURTH TRANSISTORS, THE EMITTER-COLLECTOR JUNCTIONS OF SAID THIRD AND FOURTH TRANSISTOR RESPECTIVELY SHUNTING SAID FIRST AND SECOND CONTROL RESISTANCE MEMBERS, AND MEANS CONTROLLING TRANSISTORS IN A DIFFERENTIAL MANNER TO VARY THE EMITTER-COLLECTOR IMPEDANCE THEREOF.