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Uninterruptible power supply and ferroresonant transformer for use therewith

  • US 6,218,744 B1
  • Filed: 03/22/2000
  • Issued: 04/17/2001
  • Est. Priority Date: 03/22/1999
  • Status: Expired due to Fees
First Claim
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1. 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; and

    a 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.

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