Patents by Inventor K. Kit Sum

K. Kit Sum 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).

  • Valley-fill power factor correction circuit
    Patent number: 6141230
    Abstract: A valley-fill power factor correction circuit includes a rectifying circuit connected to a charge storage circuit. There is a voltage doubler circuit disposed between the rectifying circuit and the charge storage circuit. The voltage doubler circuit performs the function of filling the normally truncated input current waveform. As arranged, the input current waveform can be substantially maintained with less distortion resulting in a Fourier transform in compliance with the IEC specifications. The valley-fill circuit of the invention is capable of achieving a high power factor.
    Type: Grant
    Filed: July 13, 1998
    Date of Patent: October 31, 2000
    Assignee: Broadband Telcom Power, Inc.
    Inventor: K. Kit Sum