Method and a controller to control power supply to a CCFL

Details Method and a controller to control power supply to a CCFL Method and a controller to control power supply to a CCFL

2008-01-22

2008-01-22

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S247000, C315S274000, C315S224000

Reexamination Certificate

active

07321205

ABSTRACT:
A CCFL (cold-cathode fluorescent lamp) driving system for digitally driving at least one CCFL, according to embodiments of the present invention, generally includes a transformer, a sense circuit and a CCFL controller. Through the transformer, a DC voltage is supplied to the CCFL load. The sense circuit is provided to sense the current flowing through the CCFL load, and generate a corresponding feedback signal as an input to the CCFL controller. In accordance with embodiments, the CCFL controller is provided to receive a triangular waveform signal and a sinusoidal waveform signal, where the sinusoidal waveform signal has an amplitude regulated by the feedback signal and generate an output signal, corresponding to a comparison of said triangular waveform signal and the amplitude-regulated sinusoidal waveform signal, thus the output signal can be utilized to regulate the voltage delivered to the CCFL load.

REFERENCES:
patent: 5349273 (1994-09-01), Pacholok
patent: 6239558 (2001-05-01), Fujimura et al.
patent: 6396722 (2002-05-01), Lin
patent: 6501234 (2002-12-01), Lin et al.
patent: 6642360 (2003-11-01), Filvaroff et al.
patent: 6946806 (2005-09-01), Choi
patent: 7054360 (2006-05-01), Joe et al.

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