The rapid-start lamp has total of three discharge conditions until it comes to a continuous lighting condition, (1)(stathing mode, (2)weak discharge mode, 30steady-state discharge mode, and it is very difficult to design an optimum ballast for each discharge condition through a cut and try method. It is very important to obtain the accurate waveforms of input/output voltage and current in order to design and estimate the efficiency and the power factor of a lamp. Therefore, it is useful to estimate dynamic characteristics through an analytical approach. We have performed a dynamic performance analysis using a 2-D finite element method taking account of external circuit. But, it is difficult that the analyzed results of dynamic performances agree well with the measured results, because leakage magnetic flux, distributed three-dimensionally, cannot be considered by 2-D analysis.This paper describes a 3-D dynamic performance analysis of ballast for a rapid start lamp, and verifies its acceptability through a comparison with 2-D analysis results and experimental results.
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