Patents by Inventor Shigekazu Zemba

Shigekazu Zemba 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 supply with uninterruptible function
    Patent number: 7053502
    Abstract: A power supply provided with: an AC/DC converter which receives AC power, converts the AC power into DC power, and outputs the DC power; a DC/DC converter which receives the DC power from the AC/DC converter, and controls a level of an output voltage of the DC/DC converter to be equal to a level of a voltage to be used by a load while the DC/DC converter supplies the output voltage to the load; a DC converter which is connected to an input of the DC/DC converter; and a DC power storage means which supplies electric power to the DC/DC converter through the DC converter.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: May 30, 2006
    Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.
    Inventors: Nobuyuki Aihara, Takeshi Onaka, Norikazu Tokunaga, Kenichi Onda, Satoru Masuyama, Shigekazu Zemba
  • Power supply with uninterruptible function
    Publication number: 20050078494
    Abstract: A power supply provided with: an AC/DC converter which receives AC power, converts the AC power into DC power, and outputs the DC power; a DC/DC converter which receives the DC power from the AC/DC converter, and controls a level of an output voltage of the DC/DC converter to be equal to a level of a voltage to be used by a load while the DC/DC converter supplies the output voltage to the load; a DC converter which is connected to an input of the DC/DC converter; and a DC power storage means which supplies electric power to the DC/DC converter through the DC converter.
    Type: Application
    Filed: March 26, 2004
    Publication date: April 14, 2005
    Inventors: Nobuyuki Aihara, Takeshi Onaka, Norikazu Tokunaga, Kenichi Onda, Satoru Masuyama, Shigekazu Zemba
  • Power supply with uninterruptible function
    Patent number: 6795322
    Abstract: A power supply provided with: an AC/DC converter which receives AC power, converts the AC power into DC power, and outputs the DC power; a DC/DC converter which receives the DC power from the AC/DC converter, and controls a level of an output voltage of the DC/DC converter to be equal to a level of a voltage to be used by a load while the DC/DC converter supplies the output voltage to the load; a DC converter which is connected to an input of the DC/DC converter; and a DC power storage device which supplies electric power to the DC/DC converter through the DC converter.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: September 21, 2004
    Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.
    Inventors: Nobuyuki Aihara, Takeshi Onaka, Norikazu Tokunaga, Kenichi Onda, Satoru Masuyama, Shigekazu Zemba
  • Power Supply With Uninterrupted Function
    Publication number: 20020071292
    Abstract: A power supply provided with: an AC/DC converter which receives AC power, converts the AC power into DC power, and outputs the DC power; a DC/DC converter which receives the DC power from the AC/DC converter, and controls a level of an output voltage of the DC/DC converter to be equal to a level of a voltage to be used by a load while the DC/DC converter supplies the output voltage to the load; a DC converter which is connected to an input of the DC/DC converter; and a DC power storage means which supplies electric power to the DC/DC converter through the DC converter.
    Type: Application
    Filed: December 22, 1999
    Publication date: June 13, 2002
    Inventors: NOBUYUKI AIHARA, TAKESHI ONAKA, NORIKAZU TOKUNAGA, KENICHI ONDA, SATORU MASUYAMA, SHIGEKAZU ZEMBA