Controller and driver architecture for double-ended...

Details Controller and driver architecture for double-ended... Controller and driver architecture for double-ended...

2006-07-11

2006-07-11

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S2090SC, C315S194000

Reexamination Certificate

active

07075247

ABSTRACT:
A distributed controller and DC voltage switch-driver system supplies AC power to a cold cathode fluorescent lamp of the type used to backlight a liquid crystal display. The system includes a local controller and lamp operation-monitoring subsystem, which generates two pairs of low voltage drive signals. These drive signals are distributed over low voltage wires to respective pairs of step-up transformer-driving switches installed at opposite ends of the lamp. The high voltage AC outputs of the two transformers have the same frequency, but opposite phase, to reduce the voltage ratings of the components that are installed at the opposite ends of the lamp. The use of low voltage connections from the local controller to driver circuitry at the far end of the lamp serves to reduce the cost of the components, and results in lower emitted noise and lower energy lost to capacitive coupling.

REFERENCES:
patent: 6936975 (2005-08-01), Lin et al.
patent: 6954364 (2005-10-01), Min
patent: 2003/0099122 (2003-05-01), Cho
patent: 2004/0232853 (2004-11-01), Hur et al.

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