Patents by Inventor Xiaming Zeng

Xiaming Zeng 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).

  • DC-AC converter for igniting and supplying a gas discharge lamp
    Patent number: 5345148
    Abstract: A DC-AC converter for igniting and supplying a gas discharge lamp comprises a converter control circuit including a starter circuit containing first, second and third switching elements; a load circuit including at least one gas discharge lamp; and an igniting circuit including a fourth switching element, wherein the converter control circuit controls a current through the lamp via a current sensor resistor during a pre-heating stage; the igniting circuit disenables the third switching element and thereby isolates the converter control circuit during an igniting stage; and the converter control circuit controls the current through the lamp via the current sensor resistor during normal operation.
    Type: Grant
    Filed: February 17, 1993
    Date of Patent: September 6, 1994
    Assignee: Singapore Institute of Standards and Industrial Research
    Inventors: Xiaming Zeng, Che L. Chia