Current regulated power supply with compensating means for extraneous shunting current paths across the load

Claim 1

IN A VOLTAGE/CURRENT REGULATED POWER SUPPLY, THE COMBINATION OF, A SOURCE OF DIRECT CURRENT, SIGNAL RESPONSIVE CONTROL MEANS CONNECTED IN SERIES WITH SAID SOURCE AND A PAIR OF OUTPUT TERMINALS, A FOUR ARM CLOSED LOOP VOLTAGE CONTROL BRIDGE INCLUDING A SOURCE OF REFERENCE VOLTAGE, A VOLTAGE BRIDGE CURRENT CONTROL REFERENCE RESISTOR, A VARIABLE VOLTAGE CONTROL RESISTOR AND SAID OUTPUT TERMINALS, A D.C. AMPLIFIER INCLUDING INPUT AND OUTPUT CIRCUITS, MEANS COUPLING SAID INPUT CIRCUIT TO SAID VOLTAGE BRIDGE FOR AMPLIFYING UNBALANCE SIGNALS THEREFROM, AN OR CIRCUIT COUPLED BETWEEN SAID OUTPUT CIRCUIT AND SAID CONTROL MEANS IN SIGNAL CONTROLLING RELATIONSHIP THERETO, A FOUR ARM CLOSED LOOP CURRENT CONTROL BRIDGE INCLUDING AT LEAST A CURRENT SENSING RESISTOR CONNECTED BETWEEN SAID CURRENT CONTROL MEANS AND ONE OF SAID OUTPUT TERMINALS, A SOURCE OF REFERENCE VOLTAGE, A CURRENT BRIDGE CURRENT CONTROL REFERENCE RESISTOR AND A VARIABLE CURRENT CONTROL RESISTOR, A SECOND D.C. AMPLIFIER INCLUDING INPUT AND OUTPUT CIRCUITS, MEANS COUPLING THE LAST SAID INPUT CIRCUIT TO SAID CURRENT BRIDGE FOR AMPLIFYING UNBALANCE SIGNALS THEREFROM, MEANS COUPLING THE LAST SAID OUTPUT CIRCUIT TO SAID OR CIRCUIT, AND MEANS FOR COMPENSATING EXTRANEOUS CURRENT PATH SHUNTS ACROSS SAID OUTPUT TERMINALS INCLUDING A RESISTOR IN SERIES WITH SAID CURRENT CONTROL RESISTOR OF SAID CURRENT CONTROL BRIDGE AND MEANS FOR PASSING CURRENT THROUGH SAID SERIES RESISTOR SUBSTANTIALLY PROPORTIONAL TO THE VOLTAGE ACROSS SAID OUTPUT TERMINALS, WHEREBY TO PROVIDE A VOLTAGE WITHIN SAID CLOSED LOOP OF SAID CURRENT CONTROL BRIDGE AT LEAST PARTIALLY COMPENSATING THE CURRENT IN SAID EXTRANEOUS PATHS.