Dual control dimming ballast

Details Dual control dimming ballast Dual control dimming ballast

2000-02-25

2002-11-26

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC, C315SDIG004

Reexamination Certificate

active

06486616

ABSTRACT:

TECHNICAL FIELD
The present invention relates to dimmable ballast systems.
BACKGROUND OF THE INVENTION
In existing ballast circuits for powering fluorescent lamps at an adjustable illumination level, a number of different methods are used for dimming control. One popular method for dimming control employs a phase-control device, such as a triac. The phase-control device is used to modify a firing phase angle of an alternating current (AC) powering signal. A dimming ballast circuit, in turn, controllably dims a fluorescent lamp based on the firing phase angle.
Another popular method for dimming control is based on a direct current (DC) input, such as a 0 to 10 Volt DC input, distinct from an AC powering signal. In this method, an inverter circuit controllably dims a fluorescent lamp based on the magnitude of the DC input.


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