Bridge controlled power supply

Claim 1

A REGULATED OUTPUT VOLTAGE POWER SUPPLY COMPRISING, IN COMBINATION, A SOURCE OF UNREGULATED POTENTIAL; A REFERENCE NETWORK INCLUDING PLURAL BRANCHES CONNECTED BETWEEN FIRST AND SECOND JUNCTION POINTS; A PASS TRANSISTOR CONNECTED BETWEEN ONE TERMINAL OF SAID SOURCE AND SAID FIRST JUNCTION POINT; A FIRST LOAD TERMINAL CONNECTED TO SAID FIRST JUNCTION POINT; A BALANCING CONTROL AMPLIFIER HAVING ITS INPUT CONSTITUTING ONE OF SAID BRANCHES AND HAVING ITS OUTPUT CONNECTED IN BIAS CONTROLLING RELATION TO SAID TRANSISTOR; POTENTIAL SOURCE MEANS AND RESISTOR MEANS CONNECTED IN SERIES IN ANOTHER OF SAID BRANCHES AND EFFECTIVE, UPON UNBALANCING OF THE NETWORK, TO PROVIDE A VOLTAGE DROP BETWEEN SAID JUNCTION POINTS; RESISTANCE MEANS CONNECTED BETWEEN SAID SECOND JUNCTION POINT AND A THIRD JUNCTION POINT CONNECTED TO THE OTHER TERMINAL OF SAID SOURCE OF UNREGULATED POTENTIAL AND TO THE OTHER LOAD TERMINAL; ONE OF SAID MEANS BEING ADJUSTABLE TO PRESET A FIXED DESIRED VALUE OF OUTPUT VOLTAGE; SAID NETWORK, WHEN THE SOURCE OF POTENTIAL IS AT A PRESET VALUE AND THE POTENTIAL BETWEEN SAID LOAD TERMINALS IS AT SUCH FIXED DESIRED VALUE OF OUTPUT VOLTAGE, BEING BALANCED TO THE EXTENT THAT SAID FIRST AND SECOND JUNCTION POINTS ARE AT THE SAME RELATIVE POTENTIALS; SAID NETWORK, WHEN THE OUTPUT VOLTAGE VARIES FROM ITS PRESET VALUE DUE TO VARIATION IN EITHER THE SOURCE POTENTIAL OR THE LOAD, BECOMING UNBALANCED SO THAT THERE IS AN OPERATIONALLY EFFECTIVE POTENTIAL DIFFERENCE, BETWEEN SAID FIRST AND SECOND JUNCTION POINTS, OF A RELATIVE POLARITY DEPENDING UPON THE DIRECTION OF SUCH VARIATION FROM THE RESPECTIVE PRESET VALUE; SAID POTENTIAL DIFFERENCE CONDITIONING SAID CONTROL AMPLIFIER TO VARY THE BIAS OF SAID TRANSISTOR IN AN OUTPUT VOLTAGE CORRECTING DIRECTION; AND INCLUDING LIGHT MEANS CONNECTED TO SAID LOAD TERMINALS, LIGHT RESPONSIVE MEANS FOR PROVIDING A POTENTIAL RESPONSIVE TO LIGHT FROM SAID LIGHT MEANS, AND INCLUDING AN ADDITIONAL BRANCH CONNECTED BETWEEN SAID FIRST AND SECOND JUNCTION POINTS INCLUDING AT LEAST OF THE POTENTIAL FROM SAID POTENTIAL RESPONSIVE MEANS AND A CURRENT LIMITING RESISTOR FOR MODIFYING THE OUTPUT VOLTAGE REQUIRED TO BALANCE SAID NETWORK IN ACCORDANCE WITH LIGHT FROM SAID LIGHT SOURCE.