Patents by Inventor Sampat Singh Shekhawat

Sampat Singh Shekhawat 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: 6275093
    Abstract: An IGBT gate driver circuit includes means for detecting when the collector-to-emitter voltage (Vce) of a turned-on IGBT, intended to be operated in the saturation region, increases above a preset level, indicative of a fault condition, such as a short circuit. In response to such an increase in the Vce of a turned on IGBT, the IGBT is turned-off in two steps. First, the turn-on gate drive is decreased to a level that is still above the threshold (turn-on) voltage of the IGBT in order to decrease the current flowing through the IGBT and hence, the peak power dissipation. This decrease in the current through the IGBT and the peak power dissipation increases the length of time the IGBT can withstand a fault condition such as a short circuit. Then, after decreasing the gate drive to the IGBT, the gate drive is gradually decreased until the IGBT is completely turned off.
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: August 14, 2001
    Assignee: Intersil Corporation
    Inventors: Sampat Singh Shekhawat, Jon Gladish, Anup Bhalla