Electronic Ballast for Fluorescent Lamps Operated by Constant Current Type Push-Pull Inverter

Abstract

Partly smoothing circuit suitable for a constant current type push-pull inverter has been developed for input high power factor and for increasing overall efficiency. The relation between the PF voltage ratio (partly smoothing DC voltage/inverter input peak voltage) and the luminous efficacy of fluorescent lamp was examined. The optimum PF voltage ratio is 50-60% to satisfy input high power factor and high luminous efficacy. The electronic ballast reduces power in 2×40 type (36 W) fluorescent luminaire by 28%, comparing with conventional core-coil ballast.