Patents by Inventor Minoru Banjo

Minoru Banjo 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).

  • Signal detecting circuit for digital controller
    Patent number: 5594350
    Abstract: An instantaneous value of alternating current signal from an instrument potential transformer 10 or an instrument current transformer 9 is processed with an analog filter 21, 22, the frequency to be used for correction being detected with a frequency detector 103, frequency correction of the gain of the detected signal being performed with a frequency corrector 104, 114 after detecting the root-mean-square value of the frequency, the corrected signal being supplied to a digital automatic voltage regulator 120. Thereby, it is possible to remove a direct current component and absorb a surge in a signal, and to correct the signal in coping with the fluctuation of the input signal to detect a stable signal.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: January 14, 1997
    Assignees: Hitachi, Ltd., Hitachi Electric System Company, Ltd.
    Inventors: Yutaka Koizumi, Minoru Banjo, Takeshi Wakugawa