Patents by Inventor Ryo OHIRA

Ryo OHIRA 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).

  • Matrix converter
    Patent number: 8848410
    Abstract: A matrix converter includes input terminals, output terminals, a power conversion circuit, and a snubber circuit. The power conversion circuit includes bidirectional switches of which each includes antiparallel connection circuits connected serially. The snubber circuit is connected to the bidirectional switches. The snubber circuit includes first diodes, a capacitor, a second diode, and third diodes. The first diodes are respectively corresponded to the bidirectional switches. A first connecting point of each the first diode is connected to a connection point between the two unidirectional switching elements constituting the bidirectional switch. A first connecting point of the capacitor is connected to a second connecting point of each the first diode. First and second connecting points of the second diode are connected to a second connecting point of the capacitor and the corresponding output terminal. The bidirectional switches, the first diodes, and the second diode are arranged in one power module.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: September 30, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Takahiro Uchino, Ryo Ohira
  • MATRIX CONVERTER
    Publication number: 20140159698
    Abstract: A matrix converter includes input terminals, output terminals, a power conversion circuit, and a snubber circuit. The power conversion circuit includes bidirectional switches of which each includes antiparallel connection circuits connected serially. The snubber circuit is connected to the bidirectional switches. The snubber circuit includes first diodes, a capacitor, a second diode, and third diodes. The first diodes are respectively corresponded to the bidirectional switches. A first connecting point of each the first diode is connected to a connection point between the two unidirectional switching elements constituting the bidirectional switch. A first connecting point of the capacitor is connected to a second connecting point of each the first diode. First and second connecting points of the second diode are connected to a second connecting point of the capacitor and the corresponding output terminal. The bidirectional switches, the first diodes, and the second diode are arranged in one power module.
    Type: Application
    Filed: October 21, 2013
    Publication date: June 12, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Takahiro UCHINO, Ryo OHIRA