Patents by Inventor Hiroyuki Kumasaka

Hiroyuki Kumasaka 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).

  • Digital control power circuit, control circuit thereof, control method, and electronic device using the same
    Patent number: 9935543
    Abstract: A control circuit of a digital control power circuit is provided. The control circuit includes a feedback controller configured to generate a digital duty command value such that a digital feedback value corresponding to an output voltage of the digital control power circuit is close to a target value thereof, a pulse generator configured to generate a pulse signal having a duty ratio corresponding to the digital duty command value, a non-linear controller configured to correct a pulse width of the pulse signal when a variation in the output voltage is detected, and a driver configured to drive a switching device of the digital control power circuit depending on the pulse signal.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: April 3, 2018
    Assignee: ROHM CO., LTD.
    Inventors: Hiroyuki Kumasaka, Nobuyuki Suzukawa, Yoshihisa Sakano, Sachito Horiuchi
  • Power control device, system, and method using switches for fast stabilization of a power source
    Patent number: 9684289
    Abstract: A power control device includes a control circuit configured to control a power source as a control target; and a control calculation unit configured to calculate a manipulation amount by which the control circuit controls the power source, wherein when a disturbance occurs in the power source, the control calculation unit adjusts the manipulation amount based on a predetermined parameter in the manipulation amount during a disturbance occurrence period.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: June 20, 2017
    Assignee: ROHM CO., LTD.
    Inventor: Hiroyuki Kumasaka
  • DIGITAL CONTROL POWER CIRCUIT, CONTROL CIRCUIT THEREOF, CONTROL METHOD, AND ELECTRONIC DEVICE USING THE SAME
    Publication number: 20160359410
    Abstract: A control circuit of a digital control power circuit is provided. The control circuit includes a feedback controller configured to generate a digital duty command value such that a digital feedback value corresponding to an output voltage of the digital control power circuit is close to a target value thereof, a pulse generator configured to generate a pulse signal having a duty ratio corresponding to the digital duty command value, a non-linear controller configured to correct a pulse width of the pulse signal when a variation in the output voltage is detected, and a driver configured to drive a switching device of the digital control power circuit depending on the pulse signal.
    Type: Application
    Filed: June 3, 2016
    Publication date: December 8, 2016
    Inventors: Hiroyuki KUMASAKA, Nobuyuki SUZUKAWA, Yoshihisa SAKANO, Sachito HORIUCHI
  • POWER CONTROL DEVICE, POWER CONTROL SYSTEM, AND POWER CONTROL METHOD
    Publication number: 20140088786
    Abstract: A power control device includes a control circuit configured to control a power source as a control target; and a control calculation unit configured to calculate a manipulation amount by which the control circuit controls the power source, wherein when a disturbance occurs in the power source, the control calculation unit adjusts the manipulation amount based on a predetermined parameter in the manipulation amount during a disturbance occurrence period.
    Type: Application
    Filed: September 26, 2013
    Publication date: March 27, 2014
    Applicant: Rohm Co., Ltd.
    Inventor: Hiroyuki KUMASAKA
  • Driving circuit for light emitting diode
    Patent number: 8552971
    Abstract: An LED driving circuit drives multiple channels of light emitting units which provide a function as a backlight for a liquid crystal panel. An interface unit receives a luminance setting signal that specifies the luminance for each channel. The LED driving circuit drives each of the multiple channels of light emitting units with a luminance that corresponds to the luminance setting signal.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: October 8, 2013
    Assignee: Rohm Co., Ltd.
    Inventors: Hiroyuki Ishikawa, Hiroyuki Kumasaka
  • DRIVING CIRCUIT FOR LIGHT EMITTING DIODE
    Publication number: 20110018914
    Abstract: An LED driving circuit drives multiple channels of light emitting units which provide a function as a backlight for a liquid crystal panel. An interface unit receives a luminance setting signal that specifies the luminance for each channel. The LED driving circuit drives each of the multiple channels of light emitting units with a luminance that corresponds to the luminance setting signal.
    Type: Application
    Filed: March 24, 2009
    Publication date: January 27, 2011
    Applicant: ROHM CO., LTD.
    Inventors: Hiroyuki Ishikawa, Hiroyuki Kumasaka