本論文主要是研製操作於邊界導通模式之SEPIC LED驅動器，輸出二極體具有零電流切換，並利用輸出疊接Inverse-Buck轉換器，設計輸出電壓可調整，改善傳統輸出可調壓電路易有系統不穩定、與單級電路輸出電壓漣波較大的問題。在調光電路的部份，額外增加感光元件及紅外線人體感測器，以偵測日照明暗與有無人影。最後，此LED驅動器可運用在不同的LED顆數上，其外加智能調光系統，讓此驅動器的運用範圍更廣，且更具有節約能源之效能。藉由模擬和理論分析，本文實作一台126 W輸出可調壓SEPIC轉換器，輸入交流電壓由90 Vac至130 Vac，輸出電壓調整範圍可由25 V至45 V，滿載效率可達到87%。

This thesis presents the study and implementation of an LED driver of which the topology is a SEPIC operated under boundary conduction mode (BCM). The output diode features zero-current switching (ZCS). An inverse-buck converter is cascaded at the output for the design of an adjustable output voltage. The stability, efficiency and output ripple of a traditional single-stage converter with wide range of output voltage can be improved. For the dimming circuit, the light sensor and IR sensor are additionally used to detect the brightness and presence of human beings. The studied LED driver can be applied for different numbers of LEDs in a string. And the intelligent dimming system can save the energy and extend the applications. Finally, a 126-W laboratory prototype is implemented and verified with the simulations and theoretical analysis. The input voltage ranges from 90Vac to 130Vac and the output voltage can be changed from 25 V to 45 V. The efficiency can achieve 87% at full load condition.

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