| 摘要 |
An electronic drive for fluorescent lamps that includes a feedback loop arrangement where a lumen or intensity setting is compared to the lamp current and the frequency of an inverter is changed to bring the lumen output of the lamp to a level that matches the setting. The bandwidth of the feedback loop is great enough such that the time delay around the feedback loop is faster than prior art designs, and is preferably about 50 microseconds. This fast feedback loop provides the advantage that fluorescent lamps, and especially the more non-linear fluorescent lamps, can to be dimmed down to 10-30% of normal full scale lumen output without extinguishing. The faster feedback loop also prevents flicker when as the lamp is dimmed.
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