| 摘要 |
An efficient power conversion circuit for driving a fluorescent lamp uses a pre-regulator to generate a regulated voltage with a relatively high level of ripple voltage. The regulated voltage can be varied to provide dimming of the fluorescent lamp. The regulated voltage is provided to a direct drive inverter. The direct drive inverter uses driving signals of fixed pulse widths to generate an output voltage to drive the fluorescent lamp. The output voltage has relatively long on-time durations so that the difference between the peak lamp current and the average lamp current is reduced, thus reducing a lamp current crest factor for improved lamp lighting efficiency.
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