Patents by Inventor Xiachua Hou

Xiachua Hou 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).

  • Highly efficient driving of photoflash diodes using low and fixed voltage drop-out current sink
    Patent number: 7375472
    Abstract: A circuit according to the present invention is used for driving a photoflash diode and comprises a current sink, a feedback circuit, and a DC-DC converter. The current sink is coupled to the photoflash diode for controlling the current through the photoflash diode. The feedback circuit receives a feedback signal indicative of the electrical condition of said first current regulator. The DC-DC converter is coupled to an external power source and the feedback circuit for powering the photoflash diode so as to control the electrical condition of the current sink to a predetermined value.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: May 20, 2008
    Assignee: 02Micro International Limited
    Inventors: Footshen Wong, Vlad Popescu-Stanesti, Mingkwong Han, Xiachua Hou, ChunHsi Lin
  • Highly efficient driving of photoflash diodes using low and fixed voltage drop-out current sink
    Publication number: 20060114954
    Abstract: A circuit according to the present invention is used for driving a photoflash diode and comprises a current sink, a feedback circuit, and a DC-DC converter. The current sink is coupled to the photoflash diode for controlling the current through the photoflash diode. The feedback circuit receives a feedback signal indicative of the electrical condition of said first current regulator. The DC-DC converter is coupled to an external power source and the feedback circuit for powering the photoflash diode so as to control the electrical condition of the current sink to a predetermined value.
    Type: Application
    Filed: June 8, 2005
    Publication date: June 1, 2006
    Inventors: Footshen Wong, Vlad Popescu-Stanesti, Mingkwong Han, Xiachua Hou, ChunHsi Lin