Abstract
Comparisons and examinations among self-excited parallel resonant, series resonant and current-fed push-pull electronic ballasts for fluorescent lamps in the aspects of soft starting, component stress, suitability of multi-lamp connection, variation of lumen under the operational condition of partial lamps extinguishment and/or removal, effect of lamp life time, inherence of short-/open-circuited protection, future expansion, double hot spots, lamp current crest factor and cost are presented in this paper.