Regulated power supply systems

Claim 1

A REGULATED POWER SUPPLY SYSTEM COMPRISING A SOURCE OF RECTIFIED DIRECT CURRENT, VARIABLE IMPEDANCE MEANS IN SERIES WITH ONE LINE OF THE SYSTEM EXTENDING FROM THE SOURCE INCLUDING RESISTORS AND TRANSISTORS IN SHUNT WITH SAID RESISTORS TO CONTROL THE NET IMPEDANCE PRESENTED BY SAID VARIABLE IMPEDANCE MEANS, VOLTAGE ERROR DETECTOR MEANS RESPONSIVE TO THE SYSTEM OUTPUT VOLTAGE FOR PROVIDING A CONTROL SIGNAL IN ACCORDANCE WITH THE OUTPUT VOLTAGE DEIVATION FROM THE PRESET VALUE, CIRCUIT MEANS APPLYING SAID CONTROL SIGANL TO OPERATE SAID TRANSISTORS FOR CONTROLLING SAID NET IMPEDANCE TO MAINTAIN SAID PRESET OUTPUT VOLTAGE, AND CONTROL CIRCUITRY HAVING A SUBSTANTIAL RESISTANCE IN SERIES WITH SAID MEANS, SAID CONTROL CIRCUITRY CONTAINING ELECTRONIC MEANS IN SHUNT WITH SAID RESISTANCE AND BIASED FOR SUBSTANTIALLY NORMALLY SHUNTING OUT SAID RESISTANCE DURING SYSTEM OPERATION AND FAULT-DETECTION MEANS FOR PROMPTLY BACK-BIASING SAID TRANSISTORS TO AVOID THEIR UNLOADING AND TO ALTER THE BIAS ON SAID ELECTRONIC MEANS TO REESTABLISH SAID RESISTANCE IN SERIES ACTION UPON A PREDETERMINED FAULT IN THE SYSTEM TO CURTAIL THE SYSTEM CURRENT OUTPUT.