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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 5, Iss. 5 — May. 1, 2009
  • pp: 152–161

Low Frequency Architecture for Multi-Lamp CCFL Systems With Capacitive Ignition

Montu Doshi, Regan Zane, and Francisco J. Azcondo

Journal of Display Technology, Vol. 5, Issue 5, pp. 152-161 (2009)


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Abstract

A low frequency architecture is proposed for driving parallel cold cathode fluorescent lamps (CCFLs) in large screen liquid crystal display (LCD) TV backlighting applications. Key to the architecture is a proposed capacitive coupling approach for aiding lamp ignition. A dc voltage is applied to the lamp electrodes while an ac voltage is applied to an external plate for capacitive coupling. The result is reliable, simultaneous ignition of parallel lamps with a required applied dc voltage near the lamp steady-state operating voltage. The complete system architecture includes a single high voltage converter, a pulse lamp ignition circuit, current control circuits and a single backlight controller. The topology is capable of driving a large number of parallel lamps with independent lamp current regulation, while avoiding ac coupling losses in steady-state operation and achieving significant reduction in reactive components when compared to typical high frequency ac ballast designs. Experimental results are presented for a system of four parallel 250 mm length lamps, demonstrating simultaneous parallel lamp ignition and dc current regulation.

© 2009 IEEE

Citation
Montu Doshi, Regan Zane, and Francisco J. Azcondo, "Low Frequency Architecture for Multi-Lamp CCFL Systems With Capacitive Ignition," J. Display Technol. 5, 152-161 (2009)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-5-5-152


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