臺灣博碩士論文加值系統

本文提出一整合升壓式和降壓式轉換器之高性能LED驅動器，採用兩個功率電晶體作為主動開關。無需使用任何減震電路或輔助開關，兩個轉換器的電感器電流續流經主動開關內部的二極體，使其皆可工作在零電壓切換導通（ZVS）。升壓式轉換器工作在不連續導通模式（DCM），以執行功率因數修正（PFC）的功能，確保在輸入端功率因數幾乎為1。降壓轉換器將升壓轉換器的輸出直流鏈電壓降壓，用於驅動LED。經由詳細的電路操作和分析，設計與製作60W LED驅動器雛形。實驗結果證明，藉由主動開關的ZVS操作可以有效地減小開關損耗，輸入電流追隨輸入電壓呈正弦波，電路效率為95.6％。

This thesis proposes a novel LED driver consisting of a boost converter and a buck converter. Each converter adopts a power MOSFET as the active switch. Without useing any lossless snubber circuit and/or auxiliary switch, both active switches can operate at zero-voltage switching (ZVS) on by freewheeling the inductor currents of the converters to flow through the intrinsic diodes of the MOSFETs. The boost converter is operated at discontinuous-conduction mode (DCM) to perform the function of power-factor correction (PFC) to ensure almost unity power factor at the input line.
The detailed circuit operations and analysis are provided. A prototype 60-W LED driver was built and tested. Experimental results show that the switching losses can be effectively reduced by operating the active switches at ZVS. The measured power factor and circuit efficiency are as high as 0.99 and 95.6%, respectively.

中文摘要i
英文摘要ii
致謝iii
目錄iv
圖目錄vi
表目錄viii
第一章 簡介1
1-1研究動機1
1-2論文大綱3
第二章 功率因數修正電路4
2-1 功率因數修正器之原理4
2-2 功率因數修正器之架構6
2-2-1 被動式功率因數修正器6
2-2-2 主動式功率因數修正器7
第三章 新型高性能LED調光驅動器10
3-1 電路架構10
3-2 控制電路11
3-2-1 閉迴路控制電路11
3-2-2 低頻PWM調光12
3-3 電路動作分析13
第四章 電路參數設計19
4-1 升壓式功率因數修正電路19
4-2 降壓式轉換器24
4-3 參數設計26
第五章 電路模擬與實驗結果29
5-1 電路模擬波形與實作量測波形29
5-2 調光量測波形36
5-2-1 低頻PWM訊號導通週期為90%36
5-2-2 低頻PWM訊號導通週期為80%39
5-2-3 低頻PWM訊號導通週期為70%41
5-2-4 低頻PWM訊號導通週期為60%43
5-2-5 低頻PWM訊號導通週期為50%45
5-2-6 LED調光實驗結果47
第六章 結論與未來研究方向49
6-1 結論49
6-2 未來研究方向50
參考文獻51
圖目錄
圖2-1 輸入電壓與電流及電流基頻成分波形示意圖4
圖2-2 功率因數修正電路分類6
圖2-3 具被動式濾波器之傳統電源轉換器7
圖2-4 常見的主動式功率因數修正電路8
圖3-1 雙級LED驅動器10
圖3-2 新型高性能LED驅動器11
圖3-3 高頻開關驅動訊號控制圖12
圖3-4 L6599 IC之內部控制方塊圖12
圖3-5 低頻開關驅動訊號控制圖13
圖3-6 輸入整流電壓Vrec於峰值時的理論波形圖14
圖3-7 LED驅動器的工作模式16
圖4-1 電感電流ip操作於DCM示意波形23
圖4-2 電感電流與輸入電流示意圖23
圖4-3 電感電流ib操作於DCM的示意波形24
圖5-1 LED驅動器之IsSpice模擬電路圖29
圖5-2 輸入電壓vin、輸入電流iin及電感電流ip波形30
圖5-3 電感電流ip及ib波形31
圖5-4 主動功率開關S1與S2之電壓、電流波形(vrec為峰值)32
圖5-5 主動功率開關S1與S2之電壓、電流波形(vrec接近零點)33
圖5-6 輸出電壓VCo、輸出電流Io波形34
圖5-7 輸出電容電壓漣波Vr、輸出電流漣波Ir35
圖5-8 低頻PWM訊號導通週期為90%之實測波形36
圖5-9 低頻PWM訊號導通週期為80%之實測波形39
圖5-10 低頻PWM訊號導通週期為70%之實測波形42
圖5-11 低頻PWM訊號導通週期為60%之實測波形44
圖5-12 低頻PWM訊號導通週期為50%之實測波形46
表目錄
表4-1 電氣規格表26
表4-2 LED模組規格表26
表4-3 電路元件參數表28
表5-1 電路滿載之實際量測結果47
表5-2 電路調光之實際量測結果48

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