Patents by Inventor Kazuaki Kitaga

Kazuaki Kitaga 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).

  • Driving current generation circuit, LED power supply module and LED lamp
    Patent number: 9888538
    Abstract: A driving current generation circuit includes a semiconductor device configured to operate with a variable voltage as a reference voltage, a driving current generator configured to generate a driving current for driving an LED (Light Emitting Diode) based on an instruction received from the semiconductor device, and a dimming voltage converter configured to generate a second dimming voltage set based on the variable voltage from a first dimming voltage set based on a ground voltage, wherein the semiconductor device performs a driving control of the driving current generator based on the second dimming voltage.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: February 6, 2018
    Assignee: Rohm Co., Ltd.
    Inventors: Eiichiro Niikura, Kazuaki Kitaga, Satoshi Yamada, Masamichi Iwaki
  • DRIVING CURRENT GENERATION CIRCUIT, LED POWER SUPPLY MODULE AND LED LAMP
    Publication number: 20160073463
    Abstract: A driving current generation circuit includes a semiconductor device configured to operate with a variable voltage as a reference voltage, a driving current generator configured to generate a driving current for driving an LED (Light Emitting Diode) based on an instruction received from the semiconductor device, and a dimming voltage converter configured to generate a second dimming voltage set based on the variable voltage from a first dimming voltage set based on a ground voltage, wherein the semiconductor device performs a driving control of the driving current generator based on the second dimming voltage.
    Type: Application
    Filed: November 17, 2015
    Publication date: March 10, 2016
    Inventors: Eiichiro Niikura, Kazuaki Kitaga, Satoshi Yamada, Masamichi Iwaki
  • Driving current generation circuit, LED power supply module and LED lamp
    Patent number: 9220134
    Abstract: A driving current generation circuit includes a semiconductor device configured to operate with a variable voltage as a reference voltage, a driving current generator configured to generate a driving current for driving an LED (Light Emitting Diode) based on an instruction received from the semiconductor device, and a dimming voltage converter configured to generate a second dimming voltage set based on the variable voltage from a first dimming voltage set based on a ground voltage, wherein the semiconductor device performs a driving control of the driving current generator based on the second dimming voltage.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: December 22, 2015
    Assignee: Rohm Co., Ltd.
    Inventors: Eiichiro Niikura, Kazuaki Kitaga, Satoshi Yamada, Masamichi Iwaki
  • DRIVING CURRENT GENERATION CIRCUIT, LED POWER SUPPLY MODULE AND LED LAMP
    Publication number: 20130009559
    Abstract: A driving current generation circuit includes a semiconductor device configured to operate with a variable voltage as a reference voltage, a driving current generator configured to generate a driving current for driving an LED (Light Emitting Diode) based on an instruction received from the semiconductor device, and a dimming voltage converter configured to generate a second dimming voltage set based on the variable voltage from a first dimming voltage set based on a ground voltage, wherein the semiconductor device performs a driving control of the driving current generator based on the second dimming voltage.
    Type: Application
    Filed: July 3, 2012
    Publication date: January 10, 2013
    Applicant: ROHM CO., LTD.
    Inventors: Eiichiro NIIKURA, Kazuaki KITAGA, Satoshi YAMADA, Masamichi IWAKI
  • Driving device for providing light dimming control of light-emitting element
    Patent number: 7952297
    Abstract: A driving device includes a first switch element to switch between applying or not applying to a light-emitting element a voltage directed to setting the light-emitting element in an ON state, and a constant current control circuit to adjust a current flowing through the light-emitting element when the light-emitting element is in an ON state to a predetermined current value.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: May 31, 2011
    Assignee: Rohm Co., Ltd.
    Inventors: Hiroyuki Fukui, Kazuaki Kitaga
  • Driving Device for Providing Light Dimming Control of Light-Emitting Element
    Publication number: 20090058318
    Abstract: A driving device includes a first switch element to switch between applying or not applying to a light-emitting element a voltage directed to setting the light-emitting element in an ON state, and a constant current control circuit to adjust a current flowing through the light-emitting element when the light-emitting element is in an ON state to a predetermined current value.
    Type: Application
    Filed: July 25, 2008
    Publication date: March 5, 2009
    Applicant: Rohm Co., Ltd
    Inventors: Hiroyuki Fukui, Kazuaki Kitaga