Patents by Inventor Kung-Hui Fang

Kung-Hui Fang 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).

  • Soft-switched power converters
    Patent number: 6987675
    Abstract: A soft-switched boost converter includes an active snubber to provide soft switching of all semiconductor components. Specifically, the current (“turn-off current”) in the rectifier is switched off at a controlled rate, the main switch is closed under zero-voltage switching (ZVS) condition, and the auxiliary switch in the active snubber is opened under zero-current switching (ZCS) condition. As a result, switching losses are reduced with beneficial effects on conversion efficiency and EMC performance.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: January 17, 2006
    Assignee: Delta Electronics, Inc.
    Inventors: Milan M. Jovanovic, Yungtaek Jang, Yu-ming Chang, Kung-Hui Fang
  • Soft-switched power converters
    Publication number: 20050226012
    Abstract: A soft-switched boost converter includes an active snubber to provide soft switching of all semiconductor components. Specifically, the current (“turn-off current”) in the rectifier is switched off at a controlled rate, the main switch is closed under zero-voltage switching (ZVS) condition, and the auxiliary switch in the active snubber is opened under zero-current switching (ZCS) condition. As a result, switching losses are reduced with beneficial effects on conversion efficiency and EMC performance.
    Type: Application
    Filed: May 23, 2003
    Publication date: October 13, 2005
    Inventors: Milan Jovanovic, Yungtaek Jang, Yu-Ming Chang, Kung-Hui Fang