Ballast with filament heating control circuit

Details Ballast with filament heating control circuit Ballast with filament heating control circuit

2007-03-06

2007-03-06

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

C315S2090SC, C315S307000, C315SDIG002, C315SDIG002

Reexamination Certificate

active

11095088

ABSTRACT:
A ballast (10) for powering at least one gas discharge lamp (20) having lamp filaments (22,24) comprises an inverter (200), an output circuit (300), a filament heating control circuit (400), and a dimming control circuit (500). Filament heating control circuit (400) is coupled to the dimming control circuit and at least one of the inverter and the output circuit. During operation, filament heating control circuit (400) controls the inverter and output circuit such that heating of the lamp filaments is provided during a preheat mode that occurs prior to ignition of the lamp, and during a dimming mode that optionally occurs after ignition of the lamp and that includes operating the lamp at a current level that is substantially less than a rated normal operating current of the lamp. No heating of the lamp filaments is provided during a full-light mode that occurs after ignition of the lamp and that includes operating the lamp at a current level that is substantially equal to the rated normal operating current of the lamp.

REFERENCES:
patent: 6348769 (2002-02-01), Pinchuk et al.
patent: 6483256 (2002-11-01), Heckmann
patent: 6531831 (2003-03-01), Chou et al.

Affiliated with

Also associated with

Rating

Ballast with filament heating control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ballast with filament heating control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ballast with filament heating control circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3750874