Abstract
An electronic ballast for multiple tubular fluorescent lamps is presented in this paper. The proposed structure features high power factor, dimming capability, and soft-switching to the semiconductor devices operated in high frequencies. A zero-current-switching-pulse-width-modulated (ZCS-PWM) SEPIC converter composes the rectifying stage, controlled by the instantaneous average input current technique, performing soft-commutations and high input power factor. Regarding the inverting stage, it is composed by a classical resonant half-bridge converter, associated to series parallel-loaded resonant (SPLR) filters. The dimming control technique employed in this half-bridge inverter is based on the phase-shift in the current processed through the sets of filter + lamp. In addition, experimental results are shown in order to validate the developed analysis.
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