Patents by Inventor John M. Neilson

John M. Neilson 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).

  • Double sided IGBT phase leg architecture and clocking method for reduced turn on loss
    Patent number: 6856520
    Abstract: A double-side IGBT (DIGBT) phase leg architecture that uses the DIGBT as a substitute for a free wheeling diode to achieve reduced turn-on loss and reduced reverse recovery peak current during turn-on is described and characterized. Approximately a 50% reduction in reverse recovery peak current and an 80% reduction in recovery charge are achieved. In addition, low power dissipation (?1 A current level) protection circuitry is described that can be incorporated into the DIGBT phase leg architecture to allow the flow of reverse current even if the gate driver circuit is disabled so that conventional high current free wheeling diodes are not required to provide protection.
    Type: Grant
    Filed: May 20, 2003
    Date of Patent: February 15, 2005
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John M. Neilson, Francis J. Kub, Karl D. Hobart
  • Double sided IGBT phase leg architecture and clocking method for reduced turn on loss
    Publication number: 20040070027
    Abstract: A double-side IGBT (DIGBT) phase leg architecture that uses the DIGBT as a substitute for a free wheeling diode to achieve reduced turn-on loss and reduced reverse recovery peak current during turn-on is described and characterized. Approximately a 50% reduction in reverse recovery peak current and an 80% reduction in recovery charge are achieved. In addition, low power dissipation (≈1 A current level) protection circuitry is described that can be incorporated into the DIGBT phase leg architecture to allow the flow of reverse current even if the gate driver circuit is disabled so that conventional high current free wheeling diodes are not required to provide protection.
    Type: Application
    Filed: May 20, 2003
    Publication date: April 15, 2004
    Inventors: John M. Neilson, Francis J. Kub, Karl D. Hobart