本論文主要研製「雙燈管複金屬燈電子式安定器」，電路為三級式架構。第一級返馳式轉換器用於功率因數修正，第二級降壓式轉換器控制燈管功率，第三級共臂橋式換流器以交流低頻方波驅動燈管。此架構亦可衍伸應用於多燈管複金屬燈驅動。論文中首先說明傳統三級式電子式安定器電路架構，並分析本文採用之電路架構特性與動作原理。最後實作一70 W複金屬燈電子式安定器，驅動兩個35 W複金屬燈，驗證架構之可行性與電路特性。實驗結果顯示安定器整體效率為80 %，且輸入功率因數為0.98，輸入電流總諧波失真率為11 %。

This thesis proposes a three-stage electronic ballast to drive two metal halide lamps. The first stage is a flyback converter that achieves high power factor and provides constant DC-bus voltage. The second stage is a buck converter that controls the lamp power. The third stage is a common-leg bridge inverter to drive the lamp with a low-frequency square waveform. Also, the proposed topology can be used for multiple-lamp applications. The conventional three-stage electronic ballast is discussed in this thesis. Furthermore, the characteristics and operation principles of the proposed electronic ballast are analyzed. Finally, a laboratory prototype of the 70 W electronic ballast is implemented to drive dual 35 W metal halide lamps; this prototype verifies the feasibility of the proposed circuit topology. The measured results show that the efficiency of the proposed ballast is 80 %, the input power factor is 0.98, and the total current harmonic distortion is 11 %.

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