Patents by Inventor David F. Witt

David F. Witt 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).

  • AC to AC power converter for electronic devices having substantially different output voltage/current characteristics
    Patent number: 6703818
    Abstract: A method for performing power conversion provides a converter output AC waveform from a converter input AC waveform, the convertor input waveform having an input power level, an input frequency, an input waveform shape, and an input voltage/current characteristic. The converter input AC waveform is applied to a converter switch with a switch frequency and the switch is operated at the switch frequency to provide a switched waveform having a plurality of switched waveform notches with a notch repetition rate substantially equal to the switch frequency. A filter performs filtering of the switched waveform to provide the converter output AC waveform with an output power level substantially equal to the input power level, an output frequency substantially equal to the input frequency, an output waveform shape substantially similar to the input wave form shape, and an output voltage/current characteristic substantially different from the input voltage/current characteristic.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: March 9, 2004
    Assignee: D/E Associates, Inc.
    Inventors: David Anthony Amels, George A. DeLellis, III, David F. Witt, Edward J. Linkus, Jr.
  • AC TO DC POWER CONVERTER FOR ELECTRONIC DEVICES HAVING SUBSTANTIALLY DIFFERENT OUTPUT VOLTAGTE/CURRENT CHARACTERISTICS
    Publication number: 20030117821
    Abstract: A method for performing power conversion provides a converter output AC waveform from a converter input AC waveform, the convertor input waveform having an input power level, an input frequency, an input waveform shape, and an input voltage/current characteristic. The converter input AC waveform is applied to a converter switch with a switch frequency and the switch is operated at the switch frequency to provide a switched waveform having a plurality of switched waveform notches with a notch repetition rate substantially equal to the switch frequency. A filter performs filtering of the switched waveform to provide the converter output AC waveform with an output power level substantially equal to the input power level, an output frequency substantially equal to the input frequency, an output waveform shape substantially similar to the input wave form shape, and an output voltage/current characteristic substantially different from the input voltage/current characteristic.
    Type: Application
    Filed: December 26, 2001
    Publication date: June 26, 2003
    Inventors: David Anthony Amels, George A. DeLellis, David F. Witt, Edward J. Linkus