Abstract
A
methodological study of an electronic
ballast for electrodeless fluorescent lamps (EFL) including design and development issues is presented in this paper. The ballast is intended to feed a
100 W EFL at 250 kHz with dimming feature. The proposed topology is composed of a Single-Ended
Primary Inductance Converter (SEPIC), used as power factor correction (PFC) stage,
integrated with a resonant half-bridge inverter,
used as lamp power
control (PC) stage. The integration of both stages is proposed in this paper, in order to
reduce the number of active switches, as well as to
simplify the required driving and control circuitry for this application. Experimental results demonstrate the
feasibility of the proposed solution that achieves
54% lamp power dimming
(46 W). The implemented topology attained very high power factor (0.989), and low line current total harmonic distortion (THD)
(14.929%), without using electromagnetic interference (EMI) filter, while the
measured efficiency was 87% at nominal lamp power.
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