Patents by Inventor Tsu-ming Yu

Tsu-ming Yu 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).

  • Publication number: 20060186833
    Abstract: A fluorescent tube driver circuit system of pulse-width modulation control and an operating method thereof are provided. The fluorescent tube driver circuit system of pulse-width modulation control comprises a fixed-frequency generator and a pulse-width modulator. The fixed-frequency generator receives a turn-on detecting signal for indicating a turn-on state of the fluorescent tube and decides to output a pulse signal with a first frequency or a second frequency. The pulse-width modulator can receive a feedback signal for indicating the current passing through the fluorescent tube and the pulse signal with the first frequency or the second frequency, and operate the feedback signal and the pulse signal to output a first and a second control signals.
    Type: Application
    Filed: February 23, 2005
    Publication date: August 24, 2006
    Inventors: Chung-che Yu, Tsu-ming Yu