Patents by Inventor Che Lock Chia

Che Lock Chia 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 circuit for igniting, supplying and dimming a gas discharge lamp
    Patent number: 5925985
    Abstract: An electronic ballast circuit for igniting, supplying and dimming a gas discharge lamp which comprises an oscillation control circuit, an IR2155 self-oscillating half-bridge driver, a dimming control circuit, a load circuit including at least one gas discharge lamp and an over-current protection circuit, wherein the oscillation control circuit controls a current through the lamp by pulse width modulation of a drive signal during a pre-heating stage and the normal operation to control the dimming of the gas discharge lamp.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: July 20, 1999
    Assignee: Singapore Productivity and Standards Board
    Inventors: Xiaoming Zeng, Kia Tong Tan, Che Lock Chia