Patents by Inventor Edwin W. Rowand, Jr.

Edwin W. Rowand, Jr. 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).

  • Method and apparatus for harmonic distortion correction
    Patent number: 5377092
    Abstract: There is described a method and apparatus for substantially cancelling harmonic distortion from the output voltage signal of a power supply. The system samples the output of the power supply and detects the harmonic distortion within the output signal. After the harmonic distortion is detected, the amplitude of the real and imaginary components of the harmonic distortion are determined. The amplitude components are applied to a PI compensator to generate the harmonic distortion correction signal necessary to substantially cancel harmonic distortion from the output voltage signal. The harmonic distortion correction signal is then applied to the power supply.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: December 27, 1994
    Assignee: International Power Machines
    Inventors: Edwin W. Rowand, Jr., Donald J. Lucas