Modified valley fill high power factor electronic ballast for compact fluorescent lamps

A simple, lost cost, high power factor ballast, referred to as the modified valley fill circuit, for compact fluorescent lamps is introduced. This circuit peak charges the valley fill (electrolytic) capacitor from an auxiliary winding on the high frequency ballasting inductor to a fraction of the peak line voltage, where the input power factor is optimized at 0.95. A simple lamp current feedback scheme is employed to keep the lamp current crest factor near 1.7. The overall efficiency is in the range of 87-89%.<<ETX>>

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