Patents by Inventor Gyu-Hycong Cho

Gyu-Hycong Cho 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).

  • Precommutated current source inverter
    Patent number: 4707777
    Abstract: In an auto-sequential commutated current source inverter (ASCI) system, an auxiliary bridge of thyristors is connected between auxiliary terminals, and a capacitor is charged and discharged resonantly by controlling a corresponding auxiliary thyristor of the bridge to connect the capacitor between the DC terminals and the AC terminals through the bridge in order to charge the capacitor at a precommutation level, whereby commutation of a main thyristor is effected at a reduced peak voltage, and no voltage clamp measure is necessary.
    Type: Grant
    Filed: June 5, 1986
    Date of Patent: November 17, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Gyu-Hycong Cho