Patents by Inventor Masahiko Shinotsuka

Masahiko Shinotsuka 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).

  • Charging or discharging apparatus for electrically charging or discharging a capacitor storage type power source adapted to store electric energy in electric double layer capacitors
    Patent number: 7622898
    Abstract: A charging apparatus for electrically charging a capacitor storage type power source comprises a switching circuit for turning on/off the charge current, a current detection circuit for detecting the charge current, a voltage detection circuit for detecting the voltage of power source, a constant current control circuit for outputting an error amplifying signal according to the current value, a power control circuit for outputting an error amplifying signal according to the current value, the voltage value-and a power reference value, a constant voltage control circuit for outputting an error amplifying signal according to the voltage value and a voltage reference value, an OR circuit for selecting one of the error amplifying signals and a control circuit for generating a pulse width modulation signal according to the error amplifying signal output from the OR circuit to turn on/off the switching circuit and control the charge current.
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: November 24, 2009
    Assignee: Power Systems Co., Ltd.
    Inventors: Masaaki Shimizu, Katsuji Mitsui, Masahiko Shimizu, Shinichi Yamamoto, Atsushi Shimizu, Masahiko Shinotsuka, Masaaki Yamagishi, Hiroshi Tsuji
  • Charging apparatus for capacitor storage type power source and discharging apparatus for capacitor storage type power source
    Publication number: 20070194759
    Abstract: A charging apparatus for electrically charging a capacitor storage type power source comprises a switching circuit for turning on/off the charge current, a current detection circuit for detecting the charge current, a voltage detection circuit for detecting the voltage of power source, a constant current control circuit for outputting an error amplifying signal according to the current value, a power control circuit for outputting an error amplifying signal according to the current value, the voltage value-and a power reference value, a constant voltage control circuit for outputting an error amplifying signal according to the voltage value and a voltage reference value, an OR circuit for selecting one of the error amplifying signals and a control circuit for generating a pulse width modulation signal according to the error amplifying signal output from the OR circuit to turn on/off the switching circuit and control the charge current.
    Type: Application
    Filed: February 16, 2007
    Publication date: August 23, 2007
    Applicant: Power Systems Co., Ltd.
    Inventors: Masaaki Shimizu, Katsuji Mitsui, Masahiko Shimizu, Shinichi Yamamoto, Atsushi Shimizu, Masahiko Shinotsuka, Masaaki Yamagishi, Hiroshi Tsuji