Patents by Inventor Toshio Sekine

Toshio Sekine 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 converter and power converter of rolling stock
    Patent number: 8963456
    Abstract: A power converter includes a first electric power conversion unit having an inverter for converting a first DC electric power to an AC electric power, an AC circuit connected to the first electric power conversion means; a second electric power conversion unit for receiving the first DC electric power and converting the same to a second DC electric power having a voltage level that differs from the voltage level of the first DC electric power, a power storage unit for storing the second DC electric power of the second electric power conversion unit; and a ripple suppressor having a first inductance for guiding the second DC electric power of the second electric power conversion unit to the power storage means and a second inductance for suppressing the ripple component included in the second DC electric power arranged between the second electric power conversion unit and the power storage unit.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: February 24, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Tetsu Sugiura, Masahiro Nagasu, Motomi Shimada, Ryoichi Oishi, Tadanori Sato, Toshio Sekine
  • POWER CONVERTER AND POWER CONVERTER OF ROLLING STOCK
    Publication number: 20120229055
    Abstract: A power converter includes a first electric power conversion unit having an inverter for converting a first DC electric power to an AC electric power, an AC circuit connected to the first electric power conversion means; a second electric power conversion unit for receiving the first DC electric power and converting the same to a second DC electric power having a voltage level that differs from the voltage level of the first DC electric power, a power storage unit for storing the second DC electric power of the second electric power conversion unit; and a ripple suppressor having a first inductance for guiding the second DC electric power of the second electric power conversion unit to the power storage means and a second inductance for suppressing the ripple component included in the second DC electric power arranged between the second electric power conversion unit and the power storage unit.
    Type: Application
    Filed: February 9, 2012
    Publication date: September 13, 2012
    Inventors: Tetsu SUGIURA, Masahiro Nagasu, Motomi Shimada, Ryoichi Oishi, Tadanori Sato, Toshio Sekine