臺灣博碩士論文加值系統

本論文設計與研製一個前級為主動式功因修正電路、後級為近定頻LLC諧振式轉換器，具高功率因數與高效率之兩級式AC-DC電源轉換器。
本文首先探討功因修正電路主要架構與控制方式，然後分析LLC諧振式轉換器等效模型，決定轉換器的重要電路元件參數，接著設計一可變頻率的諧振槽，使諧振頻率能自動隨著負載改變，以達近定頻工作並具有高效率之目的，最後本論文實際完成一190W之 AC-DC電源轉換器電路原型，除具有傳統LLC之優點外，其輕載轉換效率更獲得改善提升，並具高功因與近定頻操作特性。
由實驗結果得知，在極輕載(9.5 W)下效率最高為81 %，電路最高效率為88 %，19 W~190 W操作頻率變化為0.4 kHz(AC 110 V)與0.3 kHz(AC 220 V)。

In this thesis, a two-stage AC-DC converter with high efficiency and high power factor is designed and implemented, which consists of an active power factor correction circuit and an LLC resonant converter with near constant-frequency.
This study firstly discusses the circuit topologies of active power factor correctors and different types of control modes. Then, the analysis of the LLC resonant converter is conducted; and the design of the key circuit element parameters of the converter is created. Furthermore, in order to achieve the functions of near constant-frequency and high conversion efficiency, a variable-frequency resonant tank is designed to vary the resonant frequencies when load changes. Eventually, a 190W LLC based AC/DC converter with high conversion efficiency and high power factor is implemented.
The experimental results of the AC/DC 190 W converter show that the efficiency of the ultra-light load 9.5 W is 81 %, the maximum efficiency of the circuit presents 88 %, and the changes of the operation frequencies for 19 W to 190 W appear 0.4 kHz (AC 110 V) and 0.3 kHz (AC 220 V).

致謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 VI
表目錄 X
第一章 緒論 1
1.1 研究動機及目的 1
1.2 章節概述 2
第二章 功率因數修正 4
2.1 主動式功率因數修正簡介 4
2.2 功率因數修正之架構 8
2.3 昇壓式轉換器功率因數修正方法 14
2.4 固定截止時間控制模式 16
第三章 LLC諧振式轉換器 24
3.1 LLC諧振式轉換器簡介 25
3.1.1 Region 2電路動作分析 29
3.1.2 諧振元件設計 41
3.2 近定頻諧振式轉換器 48
3.2.1 可變諧振槽之原理 49
3.2.2 可變諧振電感值設計 50
第四章 設計實例 52
4.1 功率因數修正轉換器參數設計 53
4.2 近定頻LLC諧振式轉換器參數設計 57
4.3 量測與討論 63
第五章 結論與未來展望 71
5.1 結論 71
5.2 未來展望 71
參考文獻 73

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