Patent ID: 6218744
Filing Date: 2001-04-17
Classification: G05F,G06Q,G16H,H02J,H02M

Abstract:
An uninterruptable power supply (UPS), comprising:a ferroresonant transformer having a first input winding adapted to be coupled to an external primary source of power, a second input winding, and an output winding, said first input winding containing at least two winding taps;an output tank capacitor coupled across said output winding;a secondary power source coupled to said second input winding;at least two tap-switching relays interposed between said at least two winding taps and the external primary source of power, each of said tap-switching relays selectively coupling the external source of power to one of said winding taps; anda controller in sensory communication with a voltage of the external source of power, said controller selectively commanding said tap-switching relays to open and close based on said sensed voltage.