Low-loss voltage control circuit

Claim 1

A POWER SUPPLY DEVICE FOR DERIVING A STABILIZED DIRECT VOLTAGE FROM A VOLTAGE SOURCE, COMPRISING IN COMBINATION: AN OUTPUT CIRCUIT CONNECTING THE VOLTAGE SOURCE WITH OUTPUT TERMINALS FOR CONNECTING A LOAD TO THE DEVICE, A TRANSISTOR HAVING A FIRST AND A SECOND ELECTRODE CONNECTED IN SERIES WITH SAID OUTPUT CIRCUIT, MEANS CONNECTED ACROSS SAID OUTPUT TERMINALS AND RESPONSIVE TO CHANGES IN THE VOLTAGE ACROSS SAID TERMINALS TO CONTROL THE CURRENT THROUGH SAID TRANSISTOR IN A SENSE TO COUNTERACT SAID CHANGES IN VOLTAGE, SWITCHING MEANS CONNECTED IN SERIES WITH SAID OUTPUT CIRCUIT AND RESPONSIVE TO A VOLTAGE OF ONE POLARITY TO CUT OFF SAID OUTPUT CIRCUIT AND RESPONSIVE TO A VOLTAGE OF THE OPPOSITE POLARITY TO OPEN SAID CIRCUIT, A SOURCE OF REFERENCE VOLTAGE, MEANS FOR PRODUCING A UNIDIRECTIONAL VOLTAGE OF PERIODICALLY VARYING MAGNITUDE, MEANS FOR COMBINING THE VOLTAGE BETWEEN SAID FIRST AND SECOND ELECTRODES OF THE TRANSISTOR WITH SAID UNIDIRECTIONAL VOLTAGE OF VARYING MAGNITUDE AND WITH THE VOLTAGE FROM SAID REFERENCE VOLTAGE SOURCE TO PRODUCE A RESULTING CONTROL VOLTAGE OF PERIODICALLY CHANGING POLARITY, AND MEANS FOR APPLYING SAID CONTROL VOLTAGE TO CONTROL SAID SWITCHING MEANS.