Patents by Inventor Kwok Tai Philip Mok

Kwok Tai Philip Mok 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).

  • Phase-controlled dimmable ballast
    Patent number: 6172466
    Abstract: A method and apparatus are disclosed for the dimming control of a fluorescent lamp driven by an electronic ballast. A small portion (eg less than 15°) of the phase of the input supply voltage is removed, and the precise amount of the phase removed is used to generate a switching signal that controls the switching frequency of the electronic ballast and hence the light power output. The switching frequency is generated by producing pulses of a width proportional to the amount of phase removed, integrating the pulses to produce a voltage proportional to the phase removed, converting that voltage to a current that varies with a frequency depending on the voltage, and using that varying current to generate the switching frequency.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: January 9, 2001
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Wing Hung Ki, Kwok Tai Philip Mok, Kin On Johnny Sin