Abstract
This paper presents a new model for electrodes of fluorescent lamps with constant RMS voltage heating, in order to predict the electrodes' characteristic ratio of hot-to-cold resistance (R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</sub> /R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> ) during the preheating phase, which is related to both the preheating time and the RMS value of voltage across the lamp electrodes. In developing this model, we first analyzed a simple test platform, to obtain a functional fit to the measured data, and then verified the model using a prototype laboratory ballast. The experimental results presented here demonstrate the validity of the analysis and confirm its potential as an effective tool for the design of electronic ballasts.
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