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Uninterruptible power supply systems, voltage regulators and operating methods employing controlled ferroresonant transformer circuits

  • US 6,348,782 B1
  • Filed: 10/02/1998
  • Issued: 02/19/2002
  • Est. Priority Date: 10/02/1998
  • Status: Expired due to Term
First Claim
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1. An uninterruptible power supply system for producing an AC voltage from at least one of a DC power source and an AC power source, the system comprising:

  • an input terminal configured to receive an AC voltage from an AC power source;

    an inverter operative to produce an AC voltage at an output thereof from a DC power source;

    a ferroresonant transformer circuit including a transformer having an input winding, an output winding, and a third winding that forms part of a resonant circuit that produces saturation in said output winding when an AC voltage on the input winding exceeds a predetermined amplitude; and

    a transformer input control circuit coupled to said input terminal and to said inverter output and operative to couple said input terminal and/or said inverter output to said input winding, said transformer input control circuit operative to regulate a circulating current in said resonant circuit by variably coupling said input terminal to said input winding responsive to a control input.

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