Self-oscillating single-stage power-factor-correction electronic ballast with duty-ratio and frequency modulation

This paper presents the analysis and design of self-oscillating single-stage power-factor-correction electronic ballast with duty-ratio and frequency modulation. The proposed ballast integrates a boost converter with a self-oscillating half-bridge inverter. A near unity power factor as well as low bus voltage, low lamp current crest factor, and constant lamp power is achieved by the proposed novel duty-ratio and frequency modulation scheme. Experimental results are provided for verification.