A single-stage electronic ballast with unity power factor is proposed. A saturable transformer constituting the self-oscillating drive limits the lamp current and dominates the switching frequency of the ballast. The proposed ballast has high energy efficiency, low cost and high reliability compared to conventional high-power-factor (HPF) electronic ballasts. Experimental results obtained on two 40 W fluorescent lamps are discussed.
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Do et al. (2001) studied this question.
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