Patents by Inventor John Kyle Earle

John Kyle Earle has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Uninterruptible power supply systems, voltage regulators and operating methods employing controlled ferroresonant transformer circuits
    Patent number: 6348782
    Abstract: An uninterruptable power supply system for producing an AC voltage from at least one of a DC power source or an AC power source includes an input terminal configured to receive an AC voltage from an AC power source, and an inverter operative to produce an AC voltage at an output thereof from a DC power source. A ferroresonant transformer circuit includes a transformer having an input winding, a output winding, and a third winding that forms part of a resonant circuit that produces saturation in the output winding when an AC voltage on the input winding exceeds a predetermined amplitude. A transformer input control circuit is coupled to the input terminal and to the inverter output and is operative to couple at least one of the input terminal and the inverter output to the input winding.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: February 19, 2002
    Assignee: Powerware Corporation
    Inventors: George W. Oughton, Jr., John Kyle Earle