Digital Lamp Balance System With Individual Lamp Current Control Capability for an LCD TV

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A digital lamp balance system that equalizes lamp current of liquid crystal display (LCD) backlight is implemented in this letter. The proposed digital balance circuit consists of a balance switch which is in series with the lamp and a dc-blocking capacitor which also acts as a ballast capacitor for parallel lighting. The parasitic capacitance of the balance switch is used as parallel impedance which makes the lamp current decrease. Microcontroller unit controls each lamp current by changing the pulsewidth modulation duty ratio of a balance switch. The specified circuit, analysis, balance principles, and experimental results of the proposed system will be presented for a 46-in LCD TV.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2012-02
Language
English
Article Type
Article
Keywords

CATHODE FLUORESCENT LAMPS; CCFL

Citation

IEEE TRANSACTIONS ON POWER ELECTRONICS, v.27, no.2, pp.637 - 641

ISSN
0885-8993
DOI
10.1109/TPEL.2011.2172819
URI
http://hdl.handle.net/10203/96018
Appears in Collection
EE-Journal Papers(저널논문)
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