Patents by Inventor Toshiaki KIKUMA

Toshiaki KIKUMA 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).

  • Power conversion device
    Patent number: 8649198
    Abstract: Disclosed is a power conversion device which achieves reductions in switching loss due to a reverse recovery current and heat generation loss. Specifically disclosed is a power conversion device provided with a cascode element configured by electrically connecting a normally-on switching element and a normally-off switching element in series and connecting a gate terminal of the normally-on switching element and a source terminal of the normally-off switching element via a cascode connection diode, and a high-speed diode electrically connected in parallel with the cascode element and having a cathode region connected to a positive electrode terminal and an anode region connected to a negative electrode terminal.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: February 11, 2014
    Assignees: Kabushiki Kaisha Toshiba, Central Research Institute of Electric Power Industry
    Inventors: Atsuhiko Kuzumaki, Hiroshi Mochikawa, Takeru Murao, Masahiro Takasaki, Tadao Ishikawa, Toshiaki Kikuma
  • POWER CONVERSION DEVICE
    Publication number: 20120087167
    Abstract: Disclosed is a power conversion device which achieves reductions in switching loss due to a reverse recovery current and heat generation loss. Specifically disclosed is a power conversion device provided with a cascode element configured by electrically connecting a normally-on switching element and a normally-off switching element in series and connecting a gate terminal of the normally-on switching element and a source terminal of the normally-off switching element via a cascode connection diode, and a high-speed diode electrically connected in parallel with the cascode element and having a cathode region connected to a positive electrode terminal and an anode region connected to a negative electrode terminal.
    Type: Application
    Filed: December 20, 2011
    Publication date: April 12, 2012
    Applicants: Central Research Institute of Electric Power Ind., KABUSHIKI KAISHA TOSHIBA
    Inventors: Atsuhiko KUZUMAKI, Hiroshi MOCHIKAWA, Takeru MURAO, Masahiro TAKASAKI, Tadao ISHIKAWA, Toshiaki KIKUMA