Patents by Inventor Hoa H. Nguyen

Hoa H. Nguyen 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).

  • Gate drive circuit with feedback-controlled active resistance
    Publication number: 20020070772
    Abstract: An active resistance is controlled to modify a drive signal provided to a gated device such as an insulated gate bipolar transistor (IGBT). The active resistance is between an input lead that receives an input drive signal, such as from a conventional gate driver IC, and an output lead at which an output drive signal is provided to the device's gate. The active resistance is controlled in response to a feedback signal that includes information about the output drive signal, so that the output drive signal is a modified version of the input drive signal. To reduce di/dt and hence control EMI emission, the output drive signal can include turn-on and turn-off transitions where the input drive signal includes steps.
    Type: Application
    Filed: October 23, 2001
    Publication date: June 13, 2002
    Applicant: International Rectifier Corporation
    Inventors: Dorin O. Neacsu, Hoa H. Nguyen