Patents by Inventor Kiyoo Mitsui

Kiyoo Mitsui 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).

  • PWM power converter using mixed bipolar and static induction transistors
    Patent number: 5021936
    Abstract: This invention relates to a PWM power converter for switching a plurality of bridge-connected semiconductor switching elements based on PWM signals. As the semiconductor switching elements, elements with a low ON voltage and small conduction loss, and elements with a small switching loss and capable of high-speed switching are combined to improve power conversion efficiency.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: June 4, 1991
    Assignees: Zaidan Hojin Handotai Kenkyu Sinkokai, Tohoku Electric Power Company, Incorporated, Tsuken Electric Ind. Co., Ltd.
    Inventors: Jun-ichi Nishizawa, Takashige Tamamushi, Koichi Mitamura, Hiroo Takahashi, Kiyoo Mitsui, Mitsuo Ikehara, Toyota Wako, Sinpei Maruyama
  • Optically controlled power converting apparatus
    Patent number: 4719551
    Abstract: The present invention provides an optically controlled power converting apparatus using light trigger/light quench electrostatic induction thyristors, as switching elements, which can execute the switching operations at a high speed being when they are supplied with light trigger pulses and light quench pulses. By supplying the light trigger pulses and light quench pulses at the timings corresponding to the pulse width modulation, the light trigger/light quench electrostatic induction thyristors can perform predetermined power converting operations.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: January 12, 1988
    Assignees: Zaidan Hojin Handotai Kenkyu Sinkokai, Tohoku Electric Power Company, Incorporated
    Inventors: Junichi Nishizawa, Takashige Tamamushi, Kimio Miura, Kiyoo Mitsui, Koichi Mitamura