Patents by Inventor Heng-Yi Li

Heng-Yi Li 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).

  • High power-factor AC/DC converter with parallel power processing
    Patent number: 7535734
    Abstract: The present invention is an AC/DC (alternating current to direct current) converter. The converter contains two semi-stages. One is the boost-flyback semi-stage that has excellent self-PFC property when operating in DCM even though the boost output is close to the peak value of the line voltage. Moreover, it allows part input power transferred to load directly through the flyback path so the power conversion efficiency is improved. The other one is the D/DC semi-stage that provides another parallel power flow path and improves the regulation speed.
    Type: Grant
    Filed: October 19, 2006
    Date of Patent: May 19, 2009
    Inventors: Heng-Yi Li, Chin-Ching Tzeng
  • High power-factor AC/DC converter with parallel power processing
    Publication number: 20080094862
    Abstract: The present invention is an AC/DC (alternating current to direct current) converter. The converter contains two semi-stages. One is the boost-flyback semi-stage that has excellent self-PFC property when operating in DCM even though the boost output is close to the peak value of the line voltage. Moreover, it allows part input power transferred to load directly through the flyback path so the power conversion efficiency is improved. The other one is the D/DC semi-stage that provides another parallel power flow path and improves the regulation speed.
    Type: Application
    Filed: October 19, 2006
    Publication date: April 24, 2008
    Applicant: High Power-Factor AC/DC Converter with Parallel Power Processing
    Inventors: Heng-Yi Li, Chin-Ching Tzeng