A Novel Single-Stage High-Power- Factor Electronic Ballast for High-Pressure Sodium (HPS) Lamps in Streetlight Applications

This paper proposes a novel single-stage high-power-factor electronic ballast for high-pressure sodium (HPS) lamps suitable for streetlight applications; this ballast integrates an interleaved buck-boost converter with coupled inductors and a full-bridge inverter for supplying low-frequency square-wave sources to the HPS lamp without incurring acoustic resonance. A 250W-rated prototype HPS lamp ballast circuit operating with 110V-rms input utility-line voltage has been successfully implemented and tested. The functionalities of the presented ballast are demonstrated through satisfactory experimental results in terms of high power factor (>0.99), low utility-line current total harmonic distortion <;3%), and high circuit efficiency (>89
^%
).