Regulated transistor power supply for converting d. c. to a. c.

Claim 1

A REGULATED TRANSISTOR POWER SUPPLY CIRCUIT FOR CONVERTING A DIRECT INPUT VOLTAGE TO AN ALTERNATING OUTPUT VOLTAGE COMPRISING, IN COMBINATION: A THERMALLY CONDUCTIVE CASING; A FIRST INPUT TERMINAL GROUNDED TO SAID CASING; A SECOND INPUT TERMINAL FOR RECEIVING SAID DIRECT INPUT VOLTAGE; FIRST AND SECOND SWITCHING TRANSISTORS HAVING EMITTER, COLLECTOR, AND BASE TERMINALS, SAID COLLECTOR TERMINAL BEING COMMONLY GROUNDED TO SAID FIRST INPUT TERMINAL AND CASING THEREBY PROVIDING A HEAT SINK FOR SAID TRANSISTORS; A SATURABLE CORE TRANSFORMER HAVING SPLIT PRIMARY WINDING HALVES WITH A CENTER TAP THEREBETWEEN SAID SECOND INPUT TERMINAL CONNECTING TO SAID CENTER TAP, SAID EMITTER TERMINALS CONNECTING TO THE OPPOSITE ENDS OF SAID WINDING HALVES RESPECTIVELY; A PAIR OF FEED BACK COILS IN FLUX COUPLING RELATIONSHIP WITH SAID WINDING HALVES RESPECTIVELY; CONNECTING MEANS BETWEEN FIRST ENDS OF SAID FEED BACK COILS AND BASE TERMINALS FOR FEEDING BACK CURRENT TO SAID BASE TERMINALS RESPECTIVELY, THE OTHER ENDS OF SAID FEED BACK COILS CONNECTING TO SAID OPPOSITE ENDS OF SAID WINDING HALVES RESPECTIVELY; A COMMON JUNCTION POINT CONNECTED TO SAID BASE TERMINALS; A REGULATING ZENER DIODE CONNECT AT ONE END TO SAID CONNECTION OF SAID SECOND INPUT TERMINAL TO SAID CENTER TAP; A VARIABLE RESISTANCE CONNECTED IN SERIES WITH SAID ZENER DIODE BETWEEN THE OTHER END O/F SAID DIODE AND SAID JUNCTION POINT TO HOLD THE VOLTAGE DIFFERENCE BETWEEN SAID INPUT TERMINAL AND SAID JUNCTION POINT AT A CONSTANT VALVE DETERMINED BY THE SETTING OF SAID VARIABLE RESISTANCE AND THE VOLTAGE AT WHICH SAID ZENER DIODE CONDUTS, WHEREBY THE VOLTAGE AT WHICH ACROSS EACH SPLIT PRIMARY WINDING HALVE IS CONSTANT DURING CONDUCTION THROUGH THE CORRESPONDING EMITTER TERMINAL CONNECTED THERETO TO PROVIDE A REGULATED VOLTAGE AT SAID PRIMARY; A SECONDARY WINDING IN SAID TRANSFORMER; AND OUTPUT TERMINALS EXTENDING FROM SAID CASING AND CONNECTED TO SAID SECONDARY WINDING TO PROVIDE SAID ALTERNATING OUTPUT VOLTAGE.