A study on the multiple cold cathode fluorescent lamp drive with capacitive coupling

This paper presents an architecture for driving multiple parallel cold cathode fluorescent lamps(CCFLs) for back lighting applications. The key in this architecture is a proposed capacitive coupling approach for lamp ignition. This system consists of a flyback converter, a single inverter to drive multiple lamps and conductive floating reflector. This topology is capable of driving a number of parallel lamps with independent accurate lamp current regulation, and improving cost effectiveness with significant reduction in size and weight, compared to typical high frequency ac ballast. Experimental demonstration gets result for ten of parallel CCFLs with simultaneous ignition.