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This paper presents a two-stage, high-power-factor electronic ballast for high-intensity-discharging (HID) lamps. The presented ballast is composed of a boundary-conduction-mode (BCM)-operated buck-boost-flyback converter to achieve input current shaping, and a high-frequency (20 kHz) combined with low-frequency (200 Hz) square-wave-driven half-bridge-type inverter to supply the lamp with low-frequency...
This paper presents a single-stage, low-frequency, square-wave-driven electronic ballast for supplying high-intensity-discharge (HID) lamps with interleaved power-factor-corrections (PFC) features and a constant lamp-power control scheme. The proposed ballast integrates into a single stage an interleaved PFC converter with a high-frequency interleaving low-frequency square-wave-driven full-bridge...
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