Patents by Inventor Hideki Okui

Hideki Okui 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).

  • Load driving device and electrical apparatus using the same
    Patent number: 7609015
    Abstract: A load driving device includes a driver that supplies drive current to a load having an inductance component, a current sensing resistor that generates sensed voltage corresponding to switching current that flows in the driver, a switch circuit that delivers one of the sensed voltage and a predetermined bias voltage selectively, a comparator that compares a selected voltage of the switch circuit with a predetermined reference voltage, and a logic circuit that generates a drive control signal for the driver based on a comparison output signal of the comparator, so as to perform constant-current chopping control of the drive current with improved stability of the constant-current chopping control while avoiding malfunction due to noise.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: October 27, 2009
    Assignee: Rohm Co., Ltd.
    Inventor: Hideki Okui
  • LOAD DRIVING DEVICE AND ELECTRICAL APPARATUS USING THE SAME
    Publication number: 20080036407
    Abstract: A load driving device includes a driver that supplies drive current to a load having an inductance component, a current sensing resistor that generates sensed voltage corresponding to switching current that flows in the driver, a switch circuit that delivers one of the sensed voltage and a predetermined bias voltage selectively, a comparator that compares a selected voltage of the switch circuit with a predetermined reference voltage, and a logic circuit that generates a drive control signal for the driver based on a comparison output signal of the comparator, so as to perform constant-current chopping control of the drive current with improved stability of the constant-current chopping control while avoiding malfunction due to noise.
    Type: Application
    Filed: August 9, 2007
    Publication date: February 14, 2008
    Applicant: ROHM CO., LTD.
    Inventor: Hideki Okui