Patents Assigned to Interballast Inc.
  • Patent number: 5936356
    Abstract: A fluorescent lamp flashing circuit is comprised of a fluorescent lamp to which an alternating supply voltage source is connected through a series connected loading reactance device which provides current limiting. The heaters of the fluorescent lamp are independently fed. A switching device disconnects and reconnects the alternating supply voltage at a predetermined frequency rate which is determined by a control circuit which controls a switching device. When the switching device is closed, the fluorescent lamp is bypassed through a full wave rectifier bridge and the reactance device is connected in parallel with the supply voltage source and with a bleeding resistance to load the bridge and to form a resonant circuit to maintain the loading reactance device constant and permitting an energy exchange between the supply voltage source and the loading reactance device in a resonant mode thereby maintaining a sine wave form and minimizing loss.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: August 10, 1999
    Assignee: Interballast Inc.
    Inventor: Pierre Brault