本文研製一LED燈管，能夠在不置換現有燈具的情況下，以LED燈管取代T8/18W螢光燈管。此LED燈管包含一驅動電路及一LED模組，可直接串聯於傳統式電磁安定器或預熱啟動電子安定器之輸出端。驅動電路包含一阻抗匹配電容、橋式整流器與限流電路，限流電路可限制輸出電流之峰值，進而穩定輸出功率。本驅動電路之優點為體積小、壽命長，且無EMI之問題。最後實作一12 W之LED驅動電路，在相同光輸出的條件下，以LED燈管取代螢光燈大約節能21.2%。當LED燈管接至傳統式電磁安定器時，最高效率為93.5 %；當LED燈管接至預熱啟動電子安定器時，平均效率為93%。

A retrofit LED lamp for T8/18W fluorescent lamp without replacing the lighting fixture is presented. The fluorescent lamp can be driven by the electromagnetic or pre-heating start electronic ballasts. The retrofit LED lamp including a driving circuit and a LED module can be directly connected to the ballasts, and the proposed driving circuit converts the AC output voltage of original ballast into DC voltage. A capacitor for impedance matching, a full-bridge rectifier, and a current limiting circuit to regulate LED current are integrated into the proposed LED driver. There are advantages of small size, long lifetime and no EMI problem in the proposed driving circuit. To insure light output is the same with fluorescent lamp, a 12W LED module is used. The highest efficiency of the driving circuit is 93.5% when the LED lamp is connected to the electromagnetic ballast, and the average efficiency is 93% while the LED lamp is connected to the pre-heating start electronic ballast.

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