Patents by Inventor Wueichan Liu

Wueichan Liu 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).

  • Patent number: 5901054
    Abstract: A PWM controlling circuit includes a signal generator and two PWM controllers. The signal generator comprises an oscillator, a plurality of inverters, and two RC delay networks. The oscillator and the inverters are composed of elementary elements, respectively, such as diodes, resistors, inverters and capacitors. The PWM controlling circuit in accordance with the present invention can be implemented with low cost, and the duty cycles thereof are not limited to 50%.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: May 4, 1999
    Assignee: Chun-Shan Institute of Science and Technology
    Inventors: Ching-Shan Leu, Jeang Hwang, Wueichan Liu