本論文提出兩種不同額定功率的交流發光二極體驅動電路以提高交流發光二極體的性能，且保持其優點，並以較少元件組成此兩種交流發光二極體驅動電路。其一為橋式整流型式的發光二極體串聯濾波電感與一串發光二極體，此串發光二極體被一開關分成可控制與不可控制部份。脈衝寬度調變為採用固定截止時間型式。論文首先討論在橋式整流裡的發光二極體數量與其反向峰值電壓與輸入電流命令的影響，並詳細分析電感和最大輸入電流漣波之間的關係，且針對開關額定電壓、輸入功率因數、諧波電流和轉換效率與發光二極體的串聯數量間的關係進行研究。其二為以高頻交流方波電流驅動交流發光二極體，其擁有高功率因數特性，符合IEC 61000-3-2 Class C電流諧波標準，具有好的輸出電流調節及高效率優點。電路架構採用圖騰柱無橋升壓式功率因數修正器與半橋逆變器的單級整合，具有較少的元件數量和較簡易的控制方式。
兩種被提出的交流發光二極體驅動電路的模擬和實驗結果被展示以證明其可行性。它們的功率損耗亦被計算，並與它們的實驗結果印證。最後，兩種提出的驅動電路與傳統的交流發光二極體燈之間做出一些比較，以驗證其實用性和突出的性能改進。

This dissertation proposes two AC-LED drivers for different power ratings with minimal additional components in order to improve the performance of the AC-LED lamp while maintaining the benefits. Method I consists of an AC-LED bridge rectifier, a filter inductor and an LED string which is divided into controlled and uncontrolled parts by a MOSFET. The fixed off-time pulse-width modulation (FOT-PWM) is adopted. The influences of the number of LEDs in a bridge rectifier on the peak reverse voltage of the LED and the input current command are investigated. The relationship between the inductance and the maximum input-current ripple is studied. In addition, the effects of the number of LEDs in a series string on the switch voltage rating, input PF, current harmonics, and conversion efficiency are presented.
Method II is a high-frequency square-wave current driver. The high PF, meeting requirements of the harmonic current standard IEC 61000-3-2 Class C, accurate output-current regulation, and high efficiency are achieved. The topology is a single-stage, which can be considered as a totem-pole bridgeless PFC boost rectifier combined with a half-bridge inverter. A single-stage topology is proposed for reducing quantity of components and simplifying the control method.
The simulation and experimental results of the two proposed AC-LED drivers are demonstrated. The estimated power losses of both methods are then calculated and confirmed with experimental results. Finally, contrast among the two methods and the conventional AC-LED lamp will be stated to verify the practicality of each approach and highlight the improved nuances of each design.

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