臺灣博碩士論文加值系統

本論文提出一「應用於LED驅動交流-直流轉換器之研製」，此轉換器於變壓器二次側加另一電感當作儲能之作用。此外，變壓器之剩磁能量在無需第三繞組下，可回收至輸出。本轉換器架構簡單並採用簡單脈波寬度調變(Pules-Width-Modulation)PWM，功率因數修正電路在不連續導通模式下，可獲得幾近單位功率因數及低輸入電流總諧波失真。此外，對本轉換器之原理架構與穩態特性詳細討論。最後實作一輸入交流90~264 V、輸出直流39 V ~ 46 V、輸出功率65 W之雛形電路應用於LED驅動，以驗證本轉換器之可行性。

In this thesis, a AC-DC converter is proposed applied to the LED. The converter increase the inductance of the transformer secondary side as energy storage. Energy does not need the third winding transformer remanence, recovery to output. The pulse width modulation control strategy is used to control the active switches. This circuit Power factor correction is operated in discontinous coduction mode. Can be achieved near unity power factor and low input current total harmonic distortion. The operating principle and steady-state analysis are discussed in detail. Finally, AC input 90 ~ 264 V , DC output 39 ~ 46 V and output power 65 W is implemented to verify the performance of the proposed converter.

誌謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1研究背景目的 1
1.2論文大綱 2
第二章 發光二極體特性與驅動電路簡介 3
2.1 發光二極體簡介 3
2.2 功率因數修正電路介紹 7
2.3 發光二極體驅動電路 12
2.3.1降壓型轉換器(Buck Converter) 12
2.3.2昇壓型轉換器(Boost Converter) 14
2.3.3降昇壓型轉換器(Buck-boost Converter) 16
2.3.4返馳式轉換器(Flyback Converter) 18
2.3.5 Cuk型轉換器(Cuk Converter) 20
2.3.6 SEPIC型轉換器(SEPIC Converter) [27],[28] 22
第三章 應用於LED驅動交流-直流轉換器之研製 24
3.1 主電路架構 24
3.2 電路動作原理分析 25
模式一[kTs, tk1]： 28
模式二[tk1, tk2]： 29
模式三[tk2, (k+1)Ts]： 30
3.3 穩態分析 31
3.3.1 電壓增益比 31
3.3.2 邊界操作條件 32
第四章 電路設計與實驗結果 35
4.1 實體電路及電氣規格 35
4.2.1 電感參數設計 36
4.2.2 主動開關元件設計 37
4.3 電路規格與儀器型號表 37
4.4 相關測量波形 39
第五章 未來展望 48
5.1 結論 48
5.2 未來研究方向 48
參考文獻 49

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