Patents Assigned to Top Union Globaltek Inc.
  • LED driving circuit
    Patent number: 7138770
    Abstract: An LED driving circuit that is directly activated by an AC power supply is disclosed. A driving circuit has a first and second pair of opposite branches. The first pair of opposite branches operates in a positive half cycle of the AC power supply and the second pair of branches operates in a negative half cycle of the AC power supply, so the lighting time for each LED is less than a half cycle time, in other words, the time for heat dissipation is prolonged.
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: November 21, 2006
    Assignee: Top Union Globaltek Inc.
    Inventors: Chii-Maw Uang, Wen-Gong Chen
  • LED driving circuit
    Publication number: 20060138971
    Abstract: An LED driving circuit that is directly activated by an AC power supply is disclosed. A driving circuit has a first and second pair of opposite branches. The first pair of opposite branches operates in a positive half cycle of the AC power supply and the second pair of branches operates in a negative half cycle of the AC power supply, so the lighting time for each LED is less than a half cycle time, in other words, the time for heat dissipation is prolonged.
    Type: Application
    Filed: December 27, 2004
    Publication date: June 29, 2006
    Applicant: TOP UNION GLOBALTEK INC
    Inventors: Chii-Maw Uang, Wen-Gong Chen