Patents by Inventor Xiaohui Qu

Xiaohui Qu 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).

  • Multi-string LED driver with current balancing
    Patent number: 9655174
    Abstract: The present invention discloses a current-source-output light-emitting-diode (LED) driver based on LCLC circuit to provide a constant output current regardless of variations in LED parameters. In the LCLC circuit, the number of additional capacitors is scalable with the number of LED strings for current balancing. Moreover, the input impedance of the improved LCLC circuit is designed to be resistive at the operating frequency to minimize reactive power. The conventional duty cycle control can easily incorporate zero-voltage-switching (ZVS).
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: May 16, 2017
    Assignee: The Hong Kong Polytechnic University
    Inventors: Xiaohui Qu, Siu-Chung Wong, Chi Kong Tse
  • MULTI-STRING LED DRIVER WITH CURRENT BALANCING
    Publication number: 20170019960
    Abstract: The present invention discloses a current-source-output light-emitting-diode (LED) driver based on LCLC circuit to provide a constant output current regardless of variations in LED parameters. In the LCLC circuit, the number of additional capacitors is scalable with the number of LED strings for current balancing. Moreover, the input impedance of the improved LCLC circuit is designed to be resistive at the operating frequency to minimize reactive power. The conventional duty cycle control can easily incorporate zero-voltage-switching (ZVS).
    Type: Application
    Filed: July 14, 2015
    Publication date: January 19, 2017
    Inventors: Xiaohui Qu, Siu-Chung Wong, Chi Kong Tse