本論文提出一可驅動多盞冷陰極螢光燈(Cold-Cathode Fluorescent Lamp, CCFL)之可調光半橋諧振驅動電路。半橋換流器之諧振迴路串接多組隔離變壓器，以驅動多盞冷陰極螢光燈。隔離變壓器一次側與諧振換流器串接，二次側分別驅動多盞冷陰極螢光燈。諧振迴路操作於電感性，使半橋換流器之主動功率開關操作於零電壓切換導通。控制換流器操作頻率可改變諧振電流，同時調整所有燈組之輸出功\\\率。另可於變壓器一次側並聯調光開關，透過整數波調光控制，獨立調節燈管之輸出功率，並將調光開關操作於零電流切換導通，減少切換損失。當調光開關切換時，可藉由諧振迴路中所加入補償電容以降低諧振電流的變化。本文分析電路操作原理，推演設計方程式，並據以實際製作五盞10 W冷陰極螢光燈驅動電路。經實驗量測，證實此多組輸出電路可同時調光與個別調光，並具有高轉換效率。個別調光時，諧振電流變化在10%以下；額定輸出時效率為96.15%。

A high-frequency half-bridge series resonant inverter with multiple output transformers is developed for driving multiple cold-cathode fluorescent lamps (CCFLs) with dimming feature. The primary sides of the transformers are connected in series with the resonant inverter to have an identical current, while the secondary sides are loaded by CCFLs with galvanic isolation to each other. To ensure a high circuit efficiency, the active power switches of the inverter are designed to be switched on at zero voltage. The resonant current of the inverter can be regulated by controlling the switching frequency of the inverter, so that all CCFLs can be dimmed simultaneously. On the other hand, the primary sides of the output transformers are associated with parallel switches to dim the CCFLs individually. These dimming switches are operated at a low frequency by integral cycle control with zero current switching (ZCS) to reduce the switching losses. The resonant circuit is tactfully designed to alleviate the variation of the resonant current caused by the switching of dimming switches. A laboratory circuit is built for driving 5 CCFLs. The intended circuit performances are confirmed by test results. The variation of the resonant current is less than 10% when the dimming switches are switching, and the measured efficiency for the circuit is 96.15% under the rated powers.

目錄
中文摘要 i
英文摘要 ii
目錄 iii
圖目錄 v
表目錄 vii
第一章 簡介 1
1-1 研究背景與動機 1
1-2 論文大綱 3
第二章 CCFL特性與驅動電路 4
2-1 CCFL簡介 4
2-2 CCFL特性分析 4
2-3 CCFL常見驅動電路 5
2-3-1 單燈管驅動電路 5
2-3-2 多燈管驅動電路 7
第三章 多盞CCFL之可調光驅動電路 9
3-1 驅動電路架構 9
3-2 工作模式分析 10
3-3 整數波調光控制 13
第四章 電路參數推導與實驗量測 15
4-1 電路分析 15
4-2 設計流程 20
4-3 設計實例 21
4-4 實驗量測 24
4-4-1 電路波形 24
4-4-2 變頻調光 25
4-4-3 整數波調光 27
4-4-4 電路效率 47
第五章 結論與未來研究方向 49
5-1 結論 49
5-2 未來研究方向 49
參考文獻 50

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