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Analysis of a High-Power-Factor Electronics Ballast for Electrodeless Fluorescent Lamp using SEPIC Topology

The Lighting systems based on fluorescent lamps (FLs) became popular due to their well-known features. The proposed topology of Electronic Ballast is composed of a single-ended primary-inductance converter, used as powerfactor (PF) correction stage, integrated with a resonant half-bridge inverter, used as lamp-power control stage. To eliminate the harmonic components generated by the high frequency switching of the PF correction (PFC) stage, because otherwise, high-frequency harmonics can decrease the system PF and cause interference problems with other equipment. An integrated converter that incorporates both the PFC and the PC stages is proposed. A method for achieving luminous flux control in this type of integrated converters is also investigated. The power factor achieved is 0.962 and efficiency is 88.7% and the total harmonic distortion in input current is 8.29%.