Patents by Inventor KUO-HSIEM HUANG

KUO-HSIEM HUANG 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).

  • Method and apparatus for a LED driver with high power factor
    Patent number: 8432109
    Abstract: A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: April 30, 2013
    Assignee: System General Corp.
    Inventors: Ta-Yung Yang, Li Lin, Chih-Hsien Hsieh, Chuh-Ching Li, Chi-Yin Lo, Kuo-Hsiem Huang
  • METHOD AND APPARATUS FOR A LED DRIVER WITH HIGH POWER FACTOR
    Publication number: 20120081039
    Abstract: A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.
    Type: Application
    Filed: March 28, 2011
    Publication date: April 5, 2012
    Applicant: SYSTEM GENERAL CORP.
    Inventors: TA-YUNG YANG, LI LIN, CHIH-HSIEN HSIEH, CHUH-CHING LI, CHI-YIN LO, KUO-HSIEM HUANG