Patents by Inventor Li-Wen Mao

Li-Wen Mao 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).

  • Light-emitting system having a luminous flux control device
    Patent number: 8669719
    Abstract: A light-emitting system includes first and second solid-state light-emitting components, a current source providing a constant current through the second solid-state light-emitting component, a first instrumentation amplifier detecting a second forward voltage across the second solid-state light-emitting component so as to generate a first detection voltage having a magnitude dependent on the second forward voltage, a compensation voltage module operable to generate a compensation voltage having a magnitude related to the second forward voltage according to the first detection voltage and two reference voltages, and a power control module detecting a first forward voltage across the first solid-state light-emitting component and providing a driving current therethrough that is dependent on the compensation voltage and the first forward voltage and that varies according to ambient temperature.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: March 11, 2014
    Assignee: National Chi Nan University
    Inventors: Tai-Ping Sun, Chia-Hung Wang, Li-Wen Mao
  • LIGHT-EMITTING SYSTEM HAVING A LUMINOUS FLUX CONTROL DEVICE
    Publication number: 20130076260
    Abstract: A light-emitting system includes first and second solid-state light-emitting components, a current source providing a constant current through the second solid-state light-emitting component, a first instrumentation amplifier detecting a second forward voltage across the second solid-state light-emitting component so as to generate a first detection voltage having a magnitude dependent on the second forward voltage, a compensation voltage module operable to generate a compensation voltage having a magnitude related to the second forward voltage according to the first detection voltage and two reference voltages, and a power control module detecting a first forward voltage across the first solid-state light-emitting component and providing a driving current therethrough that is dependent on the compensation voltage and the first forward voltage and that varies according to ambient temperature.
    Type: Application
    Filed: March 29, 2012
    Publication date: March 28, 2013
    Applicant: NATIONAL CHI NAN UNIVERSITY
    Inventors: Tai-Ping Sun, Chia-Hung Wang, Li-Wen Mao