An Improved Semi-theoretical Fluorescent Lamp Model for Dimmable Applications

Due to the energy-saving and environmentally friendly features, dimmable magnetic ballasts will be paid more attention in the future. This make a more accurate fluorescent lamp model at different dimming levels necessary at low operating frequency. This paper presents a new method that considers the effect of tube temperature at different dimming levels in the process of the analysis of the fluorescent lamp model. The model is verified favorably by the comparison between the simulation results and experimental results. It´s clear that after the effect of tube temperature at different dimming levels is considered, the model becomes more accurate and reliable than before. This model can be used to design dimmable magnetic ballast. Hence, the proposed model shows a good degree of accuracy for a large dimming range at different operating frequencies.