Patents Examined by Jeffray Sterrett
  • False recovery detection circuit for parallel or serial strings of thyristors
    Patent number: 4527227
    Abstract: A thyristor converter control system comprising a voltage detector for detecting the thyristor voltage and a detector output suppressing circuit provided at the output of the voltage detector. The detector output suppressing circuit operates to detect an erroneous output of the voltage detector that it provides a voltage-presence signal while it must provide a voltage-absence signal, and cuts off the output of the voltage detector upon detecting the erroneous output from the voltage detector.
    Type: Grant
    Filed: July 13, 1983
    Date of Patent: July 2, 1985
    Assignee: Hitachi, Ltd.
    Inventor: Shoichiro Koseki