A new and simple procedure has been developed which allows for rapid design and component selection for the output stage of high-frequency electronic ballasts. The procedure predicts pre-heat, ignition and running conditions based on fluorescent lamp manufacturer's specifications. This approach has been used to design commercial high-frequency electronic ballasts.
-A new model has been developed which describes the non-linear resistance of fluorescent lamps operating at high-frequency. A parabolic fit has been performed on actual lamp data which allows for simplified solutions to non-linear differential equations describing various fluorescent lamp output stages. A lamp waveform analysis has also been done using the model which shows an elliptical lamp current to be optimal.
The result is a high-performance dimming solution with a significant cost reduction. A complete dimmable ballast has been built that incorporates a new integrated circuit verifying all of these features.
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