Patents Assigned to Harvard Engineering PLC
  • HID ballast
    Patent number: 8053999
    Abstract: A method and apparatus are disclosed for providing current to a load. The apparatus includes a full or half bridge switching circuit, including at least one switching element for supplying power to a load when switched on and means for switching a state of the switching element only at a time when a substantially zero voltage is applied across the switching element.
    Type: Grant
    Filed: December 2, 2005
    Date of Patent: November 8, 2011
    Assignee: Harvard Engineering PLC
    Inventor: Christopher John Smethurst
  • Hid Ballast
    Publication number: 20080252228
    Abstract: A method and apparatus are disclosed for providing current to a load. The apparatus includes a full or half bridge switching circuit, including at least one switching element for supplying power to a load when switched on and means for switching a state of the switching element only at a time when a substantially zero voltage is applied across the switching element.
    Type: Application
    Filed: December 2, 2005
    Publication date: October 16, 2008
    Applicant: HARVARD ENGINEERING PLC
    Inventor: Christopher John Smethurst