螢光燈通常以交流弦波電流驅動，因此燈管功率會以兩倍頻率變化，使光輸出亦隨之波動。針對不容許光輸出波動的特殊應用場合，本文提出以直流電流驅動螢光燈的方式，消除光輸出的波動現象。直流電子安定器整合降升壓轉換器與半橋共振式換流器為單級高功因電子式安定器，提供燈管所需的穩定電流，並採用非對稱脈波寬度調變的控制方式，進行燈管調光；再將換流器之交流輸出，經整流與濾波後，輸出直流電流驅動螢光燈。
螢光燈以直流電流的驅動方式雖可減少光輸出波動的現象，但因為陰極燈絲長時間單方面發射電子，導致燈絲壽命快速終結。為解決此問題，本研究以全橋式換流器作為換向電路，讓燈管兩端互換操作，使燈絲電極交替發射電子。此外，另加一預熱控制電路，避免熾光電流的產生。最後以OSRAM T5-80W螢光燈為例，實際設計製作雛型電路，進行實驗量測，探討螢光燈直流操作對光輸出波動、啟動暫態、光譜能量分佈及色溫的影響。實驗結果證實本文所提出的電子安定器具有高功因、可調光、無光輸出波動與零熾光電流預熱之功能。

Fluorescent lamps are in general driven by ac ballasting currents. The cyclic variation in arc discharging power results in light fluctuation at twice the frequency of the ac current. Light fluctuation may be intolerable when a steady light output is required in some particular applications. To eliminate light fluctuation, an electronic ballast with dc current is proposed to operate the fluorescent lamp at a constant power.
The main power conversion of the electronic ballast employs the single-stage high-power-factor inverter, which is originated from a combination of the half-bridge resonant inverter and the buck-boost converter. With such a circuit configuration, the output power can be regulated by asymmetrical pulse-width-modulation. The ac output of the inverter is then rectified and filtered to provide the dc ballasting current. Driven by dc current, however, the fluorescent lamp emits electrons unilaterally from one end leading to wearing out of emission material on the cathode filament. To solve this problem, an inverter is integrated for commutation of the lamp electrodes. Furthermore, a preheating control is included to start the fluorescent lamps with zero glow-current.
A prototype is designed and built for the OSRAM T5-80W fluorescent lamp. The dc operating characteristics of starting transient, light fluctuation, lighting spectra, color temperature as well as the light fluctuation are investigated from experiments. Experimental results also show that the electronic ballast is capable of high-power-factor, dimming capability and zero glow-current preheating.

中文摘要 I
英文摘要 II
目錄 III
圖目錄 VI
表目錄 IX
第一章 簡介 1
1-1 研究動機 1
1-2 本文大綱 3
第二章 螢光燈放電特性與光輸出波動 5
2-1 光學基本知識 5
2-2 螢光燈放電特性 6
2-3 光輸出波動現象探討 7
2-4 光輸出波動程度偵測 10
第三章 直流電流驅動之電子安定器 13
3-1單級高功因電子安定器 13
3-1-1 功因修正電路 15
3-1-2 共振式換流器 17
3-2 直流換向電路 21
3-3 零熾光電流預熱電路 23
3-4 直流電流驅動之電子安定器與控制電路整合 24


第四章 安定器之參數設計與電路模擬 26
4-1 建立燈管等效電路模型 26
4-2 參數設計 30
4-2-1 降昇壓轉換器電感Lp 30
4-2-2 並聯電容Cf 30
4-2-3 直流鏈電壓Vdc、共振電感Ls與共振電容Cs
31
4-2-4 直流換向電路之濾波器設計 32
4-2-5 預熱電流與預熱時間 34
4-3 電路模擬 36
第五章 直流電子安定器操作特性量測與分析 38
5-1 啟動暫態 39
5-1-1 直流電流驅動之啟動暫態 39
5-1-2 未經預熱之方波電流驅動啟動暫態 39
5-1-3 經預熱之方波電流驅動啟動暫態 40
5-2 穩態操作 42
5-2-1 功因修正操作 42
5-2-2 換向操作 42
5-2-3 調光操作 44
5-3 光輸出波動程度量測與距離對光輸出的影響 46
5-4 直流電流驅動之燈絲壽命探討 49
5-5 光譜能量分佈、輝度與色溫比較 51
5-5-1 光譜能量分佈 51
5-5-2 輝度 53
5-5-3 色溫 54
第六章 結論與未來研究方向 56
參考文獻 59

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