Auxiliary alternating current structure

Claim 1

AUXILIARY ALTERNATING CURRENT POWER SUPPLY APPARATUS FOR USE DURING FAILURE OF A MAIN ALTERNATING CURRENT SOURCE, SAID APPARATUS COMPRISING: A PAIR OF LOAD TERMINALS ADAPTED FOR COUPLING WITH AN ALTERNTING CURRENT OPERATED LOAD; ELECTRICAL CONDUCTOR MEANS ADAPTED FOR COUPLING WITH SAID MAIN SOURCE AND COUPLED WITH SAID TERMINALS FOR SUPPLYING ALTERNATING CURRENT ELECTRICAL ENERGY THERETO WHEN THE MAIN SOURVE IS OPERATIVE; TRANSFORMER MEANS INCLUDING AT LEAST A PAIR OF WINDINGS AND MEANS OPERABLY INTERCOUPLING SAID WINDINGS, ONE OF THE LATTER BEING COUPLED WITH SAID TERMINALS; A RECHARGEABLE BATTERY; CIRCUIT MEANS INTERCOUPLING THE OTHER WINDING OF SAID TRANSFORMER MEANS WITH SAID BATTERY AND HAVING A PAIR OF OPERATIONAL CONDITIONS, SAID CIRCUIT MEANS IN ONE OF SAID CONDITIONS BEING OPERABLE TO CONVERT ALTERNATING CURRENT FROM SAID OTHER WINDING INTO UNIDIRECTIONAL CURRENT TO CHARGE SAID BATTERY, AND BEING OPERABLE IN THE OTHER CONDITION TO CONVERT DIRECT CURRENT FROM SAID BATTERY INTO A TIME-VARYING ELECTRICAL CURRENT AND EXCITE SAID OTHER WINDING WITH SAID TIMEVARYING CURRENT, SAID CIRCUIT MEANS COMPRISING AN INVERTER NETWORK HAVING A TRANSISTOR PRESENTING AT LEAST A PAIR OF ELECTRICAL CONNECTION POINTS BETWEEN WHICH SUBSTANTIAL ELECTRICAL CURRENT NORMALLY FLOWS IN ONLY ONE DIRECTION, AND CIRCUITRY COUPLING SAID TRANSISTOR WITH SAID OTHER WINDING TO PRESENT A RECTIFIER STAGE FOR CHARGING SAID BATTERY; AND CONTROL MEANS COUPLED WITH SAID CIRCUIT MEANS AND RESPONSIVE TO ALTERNATING CURRENT ELECTRICAL ENERGY FROM SAID MAIN SOURCE FOR MAINTAINING SAID CIRCUIT MEANS IN SAID ONE CONDITION, DURING OPERATION OF SAID MAIN SOURCE, AND PLACING FAILURE OF THE MAIN SOURCE, WHEREBY CONDITION UPON FAILURE OF THE MAIN SOURCE, WHEREBY SAID LOAD IS CONTINUOUSLY SUPPLIED WITH ELECTRICAL ENERGY, SAID CONTROL MEANS INCLUDING SWITCHING MEANS COUPLED WITH SAID NETWORK AND SAID CIRCUITRY FOR RENDERING THE LATTER OPERATIVE DURING OPERATION OF SAID MAIN SOURCE, AND FOR RENDERING THE NETWORK OPERATIVE UPON FAILURE OF THE MAIN SOURCE.