Patents by Inventor Katsuro Ito

Katsuro Ito 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).

  • Bypass-pair control apparatus for thyristor bridge
    Patent number: 5170334
    Abstract: In a control apparatus for controlling the firing timing of each of thyristor valves constituting a thryistor bridge by use of at least two series of control systems, a bypass-pair control circuit for thyristor bridge includes a circuit for detecting the conduction states of the thyristor valves, and a circuit for determining a conductive valve at the time of bypass-pair operation in accordance with a result of detection of the conduction state of each thyristor valve.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: December 8, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuro Ito, Teruo Yoshino
  • Thyristor converter protection method and apparatus
    Patent number: 5155673
    Abstract: A method and apparatus for protecting thyristors in a power converter from overvoltages. Voltage detectors determine if the forward voltage of each thyristor has increased in the converter. If such an overvoltage occurs during a predetermined period after the conduction of the thyristor, forced triggering of all the thyristors prevent damage to the thyristors.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: October 13, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tadashi Takahashi, Katsuro Ito