Patents by Inventor Satoru Chikai

Satoru Chikai 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).

  • Insulated gate transistor drive circuit
    Patent number: 5808504
    Abstract: The cutoff process of a collector current of an insulated gate transistor is divided into an emitter-to-collector voltage recovery period and a collector current cutoff period. During the emitter-to-collector voltage recovery period the resistance of a gate resistor of the transistor is reduced, and during the collector current cutoff period the resistance of the gate resistor is increased. With this arrangement, the cutoff time is shortened, thereby reducing switching loss and suppressing surge voltage.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: September 15, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Satoru Chikai, Haruyoshi Mori, Tomohiro Kobayashi