Driving apparatus for cold cathode fluorescent lamps

Details Driving apparatus for cold cathode fluorescent lamps Driving apparatus for cold cathode fluorescent lamps

2006-08-15

2006-08-15

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Plural load device regulation

C315S151000, C315S159000

Reexamination Certificate

active

07091675

ABSTRACT:
A driving apparatus (2) for cold cathode fluorescent lamps (CCFLs) includes a primary and a secondary driving circuits (22, 21), a primary and a secondary light tubes (24, 23), a primary and a secondary feedback circuits (26, 27), and two photosensitive elements (25) corresponding to the primary and the secondary light tubes, respectively. The primary and the secondary driving circuits provide power to drive the primary and the secondary light tubes, respectively. The primary feedback circuit receives photoelectric current of a corresponding photosensitive element and provides an output signal to the primary driving circuit. The secondary feedback circuit receives currents of both photosensitive elements, and provides an output signal to the secondary driving circuit to keep a brightness of the secondary light tube the same as the brightness of the primary light tube.

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Coaton and Marsden, © Arnold and Contributors 1997, Lamps and Lighting 4thedition, p. 212, 213, 107.

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