Patents by Inventor Katsunori Chida

Katsunori Chida 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).

  • Semiconductor device having parallel-connected, self turn-off type semiconductor elements
    Patent number: 4884126
    Abstract: A semiconductor device is disclosed in which at least two semiconductor elements each having a self turn-off function are disposed in a package and connected in paralllel, and in which the semiconductor elements, terminals mounted on the package, and internal wirings for connecting the semiconductor elements to the terminals are arranged in geometrical symmetry, to eliminate the imbalance of current between the semiconductor elements.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: November 28, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Eiji Harada, Hitoshi Matsuzaki, Sigeo Tomita, Katsunori Chida
  • Direct parallel connection circuit of self-turn-off semiconductor elements
    Patent number: 4831288
    Abstract: A direct parallel connection circuit of gate turn-off thyristors wherein a plurality of GTO's having different current capacities are directly connected in parallel. A turn-on gate current and a turn-off gate current are passed to the gate of each of GTO's through a resistor and a reactor, respectively so as to substantially simultaneously turn-on and turn-off GTO'S, respectively.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: May 16, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Katsunori Chida, Sigeo Tomita, Kenji Koga