Patents by Inventor Bruce Ashcraft

Bruce Ashcraft 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).

  • Loosely coupled parallel resonant converter
    Patent number: 6934165
    Abstract: A new power supply topology is described consisting of an input h-bridge or half-h-bridge, a low coupling coefficient transformer such as an air core transformer, a secondary resonant circuit, and a voltage multiplier which includes a series output capacitance. The topology is advantageous for high voltages since the reduced coupling leads to large spacings reduced insulation requirements.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: August 23, 2005
    Assignee: North Star Power Engineering, Inc.
    Inventors: Richard John Adler, Bruce Ashcraft, Robert J Richter-Sand
  • Loosely coupled parallel resonant converter
    Publication number: 20040208025
    Abstract: A new power supply topology is described consisting of an input h-bridge or half-h-bridge, a coupling coefficient transformer such as an air core transformer, a secondary resonant and a voltage multiplier which includes a series output capacitance. The topology is advantageous for high voltages since the reduced coupling leads to large spacings reduced insulation requirements.
    Type: Application
    Filed: February 4, 2003
    Publication date: October 21, 2004
    Inventors: Richard John Adler, Bruce Ashcraft, Robert J. Richter-Sand