臺灣博碩士論文加值系統

本論文主要在討論具均流全橋相移式冷陰極螢光燈管驅動電路，由於傳統多燈管系統中，燈管阻抗不一定相同，使流經各燈管的電流差異很大，造成亮度不均勻。本文的目的就是使用平衡變壓器，讓流經各燈管的電流差異變小，使各燈管亮度均勻。本文使用之電路架構為全橋相移式換流器，使用全橋相移式脈波寬度調變控制，使換流器在切換過程達到零電壓切換，降低切換過程的損耗，並詳細說明其動作原理、最後綜合以上的方式實作一台冷陰極螢光燈管驅動電路，以實驗結果驗證理論分析。

The aim of this thesis is to study and implement a full-bridge phase-shifted driving circuit with current balancing for cold cathode fluorescent lamps. Because the impedance of each lamp in a traditional multi-lamp system is not necessarily the same, the current through each lamp would be dramatically different. Therefore, the brightness of the system is not uniformly distributed. The aim of this thesis is to utilize balancing transformers to reduce the current differences between each lamp such that the brightness of each lamp maintains uniform. The circuit architecture in the thesis is full-bridge phase-shifted inverter. It utilizes full-bridge phase-shifted pulse width modulation to achieve zero voltage switching and reduce the switching loss. In the end, a driving circuit for cold cathode fluorescent lamp is demonstrated and the experimental results can verify the theoretical analysis.

第一章 緒論
1.1 簡介............................................1
1.2 內容介紹........................................2
第二章 螢光燈介紹
2.1 螢光燈的構造....................................3
2.2 螢光燈的發光原理................................5
2.3 螢光燈的電氣特性................................7
第三章 換流器及諧振網路
3.1 換流器..........................................9
3.1.1 Class-E諧振換流器............................9
3.1.2 半橋式換流器................................10
3.1.3 推挽式換流器................................10
3.1.4 全橋式換流器................................11
3.2 諧振網路.......................................12
3.2.1 串聯諧振串聯負載............................12
3.2.2 串聯諧振並聯負載............................14
3.2.3 串聯諧振串並聯負載..........................15
第四章 全橋相移式換流器
4.1 全橋相移式換流器電路架構.......................18
4.2 柔性切換.......................................21
4.3 全橋相移式換流器動作原理.......................23
第五章 電路設計及實作
5.1 控制電路.......................................33
5.2 燈管電流平衡電路...............................39
5.3 零件選擇.......................................42
5.4 實驗波形.......................................43
第六章 結論與未來展望
6.1 結論...........................................51
6.2 未來展望.......................................51
參考文獻..............................................53

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