Electrical power supply and battery charges

Claim 1

IN AN ELECTRICAL POWER SUPPLY HAVING A NORMAL AND A STANDBY CONDITION, THE COMBINATION OF A SOURCE OF ALTERNATING CURRENT POWER FOR SUPPLYING POWER UNDER THE NORMAL CONDITION, MEANS FOR CONVERTING THE ALTERNATING CURRENT POWER INTO DIRECT CURRENT POWER HAVING AN INPUT CONNECTED TO SAID SOURCE AND HAVING AN OUTPUT, MEANS PROVIDING A VARIABLE RESISTANCE, A RECHARGEABLE BATTERY HAVING A PREDETERMINED VOLTAGE WHEN FULLY CHARGED FOR SUPPLYING POWER UNDER THE STANDBY CONDITION UPON FAILURE OF SAID ALTERNATING CURRENT SOURCE, SAID BATTERY BEING CONNECTED IN SERIES WITH SAID VARIABLE RESISTANCE MEANS ACROSS THE OUTPUT OF SAID CONVERTING MEANS, A REFERENCE VOLTAGE DEVICE, CIRCUIT MEANS CONNECTING SAID DEVICE ACROSS SAID BATTERY TO PRODUCE A REFERENCE VOLTAGE OUTPUT, A VOLTAGE REGULATING CIRCUIT CONNECTED ACROSS SAID BATTERY AND CONNECTED TO SAID REFERENCE VOLTAGE DEVICE TO BE CONTROLLED BY SAID REFERENCE VOLTAGE OUTPUT FOR SUPPLYING CONSTANT VOLTAGE DIRECT CURRENT POWER TO A LOAD, SAID CONSTANT VOLTAGE BEING LESS THAN SAID PREDETERMINED BATTERY VOLTAGE SO THAT SAID REGULATING CIRCUIT IS EFFECTIVE IN BOTH NORMAL AND STANDBY CONDITIONS, CIRCUITRY CONNECTED TO SAID REFERENCE VOLTAGE DEVICE AND TO SAID BATTERY FOR COMPARING THE BATTERY VOLTAGE WITH SAID CONSTANT VOLTAGE AND CONNECTED TO SAID VARIABLE RESISTANCE MEANS FOR CONTROLLING SAID VARIABLE RESISTANCE MEANS TO VARY THE CURRENT FLOWING THROUGH SAID BATTERY FROM SAID CONVERTING MEANS INVERSELY TO CHANGES IN THE CHARGE STORED IN SAID BATTERY.