本論文呈現一應用於複金屬燈電子安定器之準確調光控制方法，並以三級架構為基礎，系統架構由主動功因修正電路、功率控制電路、低頻方波驅動電路、高壓點火電路及調光控制器所組成。本論文之可調光電子安定器可以藉由外部之類比訊號或數位可定址照明介面訊號平滑地調整光強度，而且調光過程中不會發生音頻共振現象。本論文之準確調光控制方法包含定功率控制及調光修正控制兩部份。定功率控制結合電壓負回授控制於定電流控制迴路中，可以避免因不同燈管電壓-電流特性差異或者燈管老化所造成之功率漂移問題；同時，整合調光修正控制，可以準確地輸出預設之調光功率值。本論文所提之控制方法不需要進行電壓及電流之乘法運算，控制簡單、成本低，可以應用於各種複金屬燈管之調光控制實驗，最後實作一150 W雛型電路去驗證本論文之控制方法。
實測結果證實本論文設計之安定器，輸入電流諧波失真可符合IEC 61000-3-2 Class C之規範，轉換效率高於89 %，調光範圍可達50 ~ 100 %，燈管功率平均變化率低於2.12 %。

In this dissertation, an accurate dimming control method for Metal-Halide (MH) lamp electronic ballasts based on a three-stage structure is proposed. The topology structure of the ballast includes AC/DC active power factor corrector, DC/DC power control converter, DC/AC low-frequency square waveform inverter, high-voltage igniter, and dimming controller that can be applied in many kinds of MH lamps. The presented dimmable electronic ballast can dim smoothly by analog signal or digital addressable lighting interface (DALI) signal without acoustic resonance. The accurate dimming control method includes the constant power control and dimming correction control is also presented. The constant power control method combines the voltage negative feedback control within the constant current control loop to solve the power drifting problem resulting from the V-I characteristic variations between lamps or caused by the aging of lamp. The proposed method is simple and requires no multiplication of voltage and current. Moreover, the accurate dimming control method can integrate with dimming correction control to dim the MH lamps under various lamp equivalent impedance conditions. Finally, a 150 W MH lamp ballast prototype is built to verify the feasibility of the proposed methods.
The experimental results show that the harmonic distortion of the input current satisfies the requirements of the IEC 61000-3-2 Class C standard. The overall conversion efficiency is higher than 89 %, the dimming range is between 100 % and 50 %, the average lamp power variation is lower than 2.12 %.

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