Patents by Inventor Chou John

Chou John 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).

  • Electronic ballast with crest factor correction
    Patent number: 6781323
    Abstract: Low cost electronic ballast does not have a function of crest factor correction in those conventional arts, and so a life span of a fluorescent lamp using the electronic ballast decreases due to a high crest factor correction. In the present invention, it provides a low cost electronic ballast controller that varies an operating frequency according to a voltage feedback to control a lamp current for achieving an objective of crest factor correction.
    Type: Grant
    Filed: June 6, 2003
    Date of Patent: August 24, 2004
    Assignee: Delta Electronics, Inc.
    Inventors: Chou Ching-Ho, Weng Zin-Chi, Chou John