Patents by Inventor Tomotsugu Ishizuka

Tomotsugu Ishizuka 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).

  • Control apparatus for semiconductor power converter
    Patent number: 7480161
    Abstract: A control apparatus for controlling a three- or single-phase semiconductor power converter employing fixed-pulse switching patterns superposes a DC component on an AC output voltage, to suppress asymmetrical magnetization of a transformer connected to the power converter. The three-phase semiconductor power converter 1 provides an AC output. The voltage of the AC output is changed by the transformer 12.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: January 20, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akihisa Kataoka, Tomotsugu Ishizuka, Koichi Hidese, Shigeru Tanaka
  • CONTROL APPARATUS FOR SEMICONDUCTOR POWER CONVERTER
    Publication number: 20080037300
    Abstract: A control apparatus for controlling a three- or single-phase semiconductor power converter employing fixed-pulse switching patterns superposes a DC component on an AC output voltage, to suppress asymmetrical magnetization of a transformer connected to the power converter. The three-phase semiconductor power converter 1 provides an AC output. The voltage of the AC output is changed by the transformer 12.
    Type: Application
    Filed: July 24, 2007
    Publication date: February 14, 2008
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Akihisa Kataoka, Tomotsugu Ishizuka, Koichi Hidese, Shigeru Tanaka
  • Power control device with electric double layer capacitor unit cells
    Patent number: 6812591
    Abstract: A power control device includes an electric power storage device connected across a power supply line for a load and including at least one electric double layer capacitor (EDLC) bank and a secondary battery combined with the EDLC bank, the EDLC bank including a plurality of parallel-connected rows of EDLC unit cells, each of the rows including a plurality of series-connected EDLC unit cells, and a control device controlling the electric power storage device so that when an input power to the electric power storage device is interrupted, the EDLC bank supplies electric power to the load for an initial period of the power interrupt and subsequently, the secondary battery supplies electric power to the load.
    Type: Grant
    Filed: July 13, 2001
    Date of Patent: November 2, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tokihiro Umemura, Noriko Kawakami, Tomotsugu Ishizuka, Kazuhiro Nakajima
  • Power control device with electric double layer capacitor unit cells
    Publication number: 20020017822
    Abstract: A power control device includes an electric power storage device connected across a power supply line for a load. The electric power storage device includes an electric double layer capacitor (EDLC) bank including a plurality of parallel-connected rows of EDLC unit cells, each of which rows includes a plurality of series-connected EDLC unit cells.
    Type: Application
    Filed: July 13, 2001
    Publication date: February 14, 2002
    Inventors: Tokihiro Umemura, Noriko Kawakami, Tomotsugu Ishizuka, Kazuhiro Nakajima