Regulated power supply

Claim 1

IN A POWER SUPPLY FOR SUPPLYING POWER TO A LOAD, A VOLTAGE REGULATING CIRCUIT HAVING A COMMON TERMINAL, AN UNREGULATED VOLTAGE TERMINAL AND A REGULATED VOLTAGE TERMINAL, COMPRISING A SERIES REGULATING ELEMENT HAVING A CONTROL INPUT; A CURRENT SENSOR, SAID SERIES REGULATING ELEMENT AND SAID CURRENT SENSOR BEING CONNECTED IN SERIES BETWEEN SAID UNREGULATED VOLTAGE TERMINAL AND SAID REGULATED VOLTAGE TERMINAL; MEANS FOR GENERATING A REFERENCE VOLTAGE ACROSS SAID COMMON TERMINAL AND SAID REGULATED VOLTAGE TERMINAL; MEANS FOR GENERATING AN ELECTRICAL DIFFERENCE SIGNAL IN ACCORDANCE WITH THE DIFFERENCE BETWEEN SAID REFERENCE VOLTAGE AND AT LEAST A PORTION OF THE VOLTAGE ACROSS SAID COMMON TERMINAL AND SAID REGULATED VOLTAGE TERMINAL; MEANS FOR APPLYING SAID ELECTRICAL DIFFERENCE SIGNAL TO SAID CONTROL INPUT OF SAID SERIES REGULATING ELEMENT, THEREBY REGULATING THE VOLTAGE BETWEEN SAID COMMON TERMINAL AND SAID REGULATED VOLTAGE TERMINAL; A FIRST VOLTAGE DIVIDER CONNECTED ACROSS SAID COMMON TERMINAL AND SAID UNREGULATED VOLTAGE TAERMINAL, SAID FIRST VOLTAGE DIVIDER INCLUDING FIRST, SECOND AND THIRD RESISTORS CONNECTED IN SERIES; A FIRST AMPLIFIER HAVING A FIRST INPUT CONNECTED TO THE JUNCTION OF SAID SECOND AND THIRD RESISTORS, A SECOND INPUT CONNECTED TO THE JUNCTION OF SAID CURRENT SENSOR AND SAID SERIES REGULATING ELEMENT AND OUTPUT CONNECTED TO THE JUNCTION OF SAID FIRST AND SECOND RESOSTORS AND RESISTIVELY CONNECTED TO SAID CONTROL INPUT OF SAID SERIES REGULATING ELEMENT, WHEREBY SAID SERIES REGULATING ELEMENT IS ISOLATED FROM VOLTAGE FLUCTUATIONS AT THE UNREGULATED VOLTAGE TERMINAL; A SECOND VOLTAGE DIVIDER COMPRISING FOURTH AND FIFTH RESITORS CONNECTED IN SERIES BETWEEN SAID COMMON TERMINAL AND SAID JUNCTION OF SAID CURRENT SENSOR AND SAID SERIES REGULATING ELEMENT; A SECOND AMPLIFIER HAVING A FIRST INPUT CONNECTED TO THE JUNCTION OF SAID FOURTH AND FIFTH RESISTORS, A SECOND INPUT CONNECTED TO SAID REGULATED VOLTAGE TERMINAL AND HAVING AN OUTPUT CONNECTED TO SAID CONTROL INPUT OF SAID SERIES REGULATING ELEMENT WHEREBY, DURING OVERLOAD, SAID SECOND AMPLIFIER OPERATES TO CUT OFF THE CONDUCTANCE OF SAID SERIES REGULATING ELEMENT.