Patents by Inventor Richard Gibson Hoft

Richard Gibson Hoft 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).

  • Patent number: 5689164
    Abstract: An inductor-capacitor series resonant circuit is connected in series with a thyristor or other unidirectionally conductive semiconductor switch to form a resonant network, one resonant network for each stator phase winding of a switched reluctance motor to be connected in parallel to the stator phase winding. Zero current switching is achieved by selecting the resonant frequency such that the inductor and capacitor resonate in a time period during both turn-on and turn-off of the semiconductor switches. A C-dump circuit is included in one embodiment for increased power transfer efficiency.
    Type: Grant
    Filed: December 8, 1995
    Date of Patent: November 18, 1997
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Richard Gibson Hoft, Tatsuya Uematsu