The figure shows the design diagram of compact fluorescent lamp ballast. The ballast includes an AC input stage with EMI filter, a passive PFC stage, a ballast control stage using ir2520d adaptive ballast control IC of International Rectifier company, a half bridge inverter and resonant output stage. Compared with the existing CFL circuit, the improvement of this design is to use valley filling passive PFC circuit and lamp current crest factor control circuit to achieve higher power factor, lower total harmonic distortion (THD) and acceptable lamp current crest factor.

Low cost compact fluorescent lamp ballast design circuit diagram

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