Patents Assigned to Lighting Device Technologies Corp.
  • Bi-direction constant current device
    Patent number: 8072162
    Abstract: An LED lamp includes a bi-direction constant current device coupled between a power supply and a LED load to provide stable positive and negative currents to the LED load. The bi-direction constant current device includes a pair of current sources face-to-face or back-to-back connected in series between the power supply and the LED load, and two protective elements shunt to the pair of current sources, respectively.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: December 6, 2011
    Assignee: Lighting Device Technologies Corp.
    Inventors: Yung Ming Tsao, Li-Hsuan Huang