Patents by Inventor Katsumi SHIOKAWA

Katsumi SHIOKAWA 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).

  • Regenerative current detection circuit, charge current detection circuit, and motor current detection system
    Patent number: 10365679
    Abstract: A regenerative current detection circuit includes a first power MOS transistor that is configured as a current mirror to a second power MOS transistor connected to drive a motor winding, a first feedback amplifier that compares a first regenerative current that flows in the first power MOS transistor with a second regenerative current that flows in the second power MOS transistor and outputs a comparison result, the first regenerative current being obtained by multiplying the second regenerative current by a current mirror ratio, and a current detection circuit that outputs a detection current based on the comparison result.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: July 30, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Daisuke Arai, Tooru Asakawa, Masahiro Shimozono, Katsumi Shiokawa
  • REGENERATIVE CURRENT DETECTION CIRCUIT, CHARGE CURRENT DETECTION CIRCUIT, AND MOTOR CURRENT DETECTION SYSTEM
    Publication number: 20180196457
    Abstract: A regenerative current detection circuit includes a first power MOS transistor that is configured as a current mirror to a second power MOS transistor connected to drive a motor winding, a first feedback amplifier that compares a first regenerative current that flows in the first power MOS transistor with a second regenerative current that flows in the second power MOS transistor and outputs a comparison result, the first regenerative current being obtained by multiplying the second regenerative current by a current mirror ratio, and a current detection circuit that outputs a detection current based on the comparison result.
    Type: Application
    Filed: August 29, 2017
    Publication date: July 12, 2018
    Inventors: Daisuke ARAI, Tooru ASAKAWA, Masahiro SHIMOZONO, Katsumi SHIOKAWA