Cold-cathode fluorescent lamp (CCFL) current control circuit

Details Cold-cathode fluorescent lamp (CCFL) current control circuit Cold-cathode fluorescent lamp (CCFL) current control circuit

2011-07-19

2011-07-19

Tran, Anh Q (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S310000, C315S311000

Reexamination Certificate

active

07982408

ABSTRACT:
A circuit to control an AC lamp current provided by an input AC voltage supply to a cold-cathode fluorescent lamp (CCFL). The circuit includes a capacitor connected in series between the AC voltage supply and one terminal of the CCFL, the capacitor biasing the CCFL with the AC lamp current; a switch having first, second, and control terminals, the first terminal being connected to the CCFL and the second terminal being connected to the other side of the supply; a diode connected in parallel to the switch; and a resistor connected in parallel to the diode, wherein the AC lamp current is controlled by controlling the switch to add and remove resistance in series with the CCFL.

REFERENCES:
patent: 6420839 (2002-07-01), Chiang et al.
patent: 7268501 (2007-09-01), Chen

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