Patents by Inventor Rumi Nakai

Rumi Nakai 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).

  • Step-up power supply device
    Patent number: 7567069
    Abstract: A step-up power supply device includes: a step-up converter; a startup circuit which controls the on/off operation of a switch element of the step-up converter when an output voltage of the device is smaller than a reference voltage; and a control circuit which operates in substitution for the startup circuit when the output voltage is higher than the reference voltage to control the on/off operation of the switch element such that the output voltage reaches a target value.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: July 28, 2009
    Assignee: Panasonic Corporation
    Inventors: Takashi Ryu, Takuya Ishii, Mikio Motomori, Kazuhito Kimura, Satoshi Wada, Rumi Nakai
  • Step-up power supply device
    Publication number: 20080074158
    Abstract: A step-up power supply device includes: a step-up converter; a startup circuit which controls the on/off operation of a switch element of the step-up converter when an output voltage of the device is smaller than a reference voltage; and a control circuit which operates in substitution for the startup circuit when the output voltage is higher than the reference voltage to control the on/off operation of the switch element such that the output voltage reaches a target value.
    Type: Application
    Filed: September 14, 2007
    Publication date: March 27, 2008
    Inventors: Takashi Ryu, Takuya Ishii, Mikio Motomori, Kazuhito Kimura, Satoshi Wada, Rumi Nakai