Fluorescent lamp ballast design circuit diagram

Photocoupler

The figure below shows a schematic diagram of a compact fluorescent lamp ballast design. The ballast includes an AC input stage with an EMI filter, a passive PFC stage, a ballast control stage using the International Rectifier IR2520D adaptive ballast control IC, a half-bridge inverter and resonant output. level. Compared to existing CFL circuits, this design is improved by using a valley-filled passive PFC circuit and a lamp current crest factor control circuit to achieve higher power factor, lower total harmonic distortion (THD) and Acceptable lamp current crest factor.
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