Patents by Inventor Yutaro IHARA

Yutaro IHARA 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).

  • Electric power converter and control method for electric power converter
    Patent number: 9712079
    Abstract: An electric power converter according to an embodiment includes a switching unit, a controller, and a second bidirectional switch. The switching unit includes a plurality of first bidirectional switches disposed between a DC power source and an AC load or between a DC load and an AC power source. The controller controls the switching unit to perform power conversion between DC power and AC power. When turning off the second bidirectional switch disposed on a path between one pole of the DC power source or the DC load and the switching unit, the controller turns on the first bidirectional switch connected between the other pole of the DC power source and the AC load or between the other pole of the DC load and the AC power source.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: July 18, 2017
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sadao Ishii, Katsutoshi Yamanaka, Tsuyoshi Higuchi, Takashi Kuboyama, Yutaro Ihara
  • ELECTRIC POWER CONVERTER AND CONTROL METHOD FOR ELECTRIC POWER CONVERTER
    Publication number: 20150070952
    Abstract: An electric power converter according to an embodiment includes a switching unit, a controller, and a second bidirectional switch. The switching unit includes a plurality of first bidirectional switches disposed between a DC power source and an AC load or between a DC load and an AC power source. The controller controls the switching unit to perform power conversion between DC power and AC power. When turning off the second bidirectional switch disposed on a path between one pole of the DC power source or the DC load and the switching unit, the controller turns on the first bidirectional switch connected between the other pole of the DC power source and the AC load or between the other pole of the DC load and the AC power source.
    Type: Application
    Filed: November 13, 2014
    Publication date: March 12, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sadao ISHII, Katsutoshi YAMANAKA, Tsuyoshi HIGUCHI, Takashi KUBOYAMA, Yutaro IHARA