Patents Assigned to Helvar Oy
  • Electronic mains connection device for a gas discharge lamp
    Patent number: 4719390
    Abstract: An inverter circuit electrically connecting a gas discharge lamp to a source of direct current voltage whereby the impedance of said lamp is resistive. Current measuring means for measuring the lamp high frequency current flow and in electrical communication with control means for controlling the on/off ratio of said inverter for maximum lamp current.
    Type: Grant
    Filed: November 1, 1984
    Date of Patent: January 12, 1988
    Assignee: Helvar Oy
    Inventor: Martti Sairanen