單級高功因LLC諧振電源轉換器之研製

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姓名

賴慶明(Ching-Ming Lai) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

單級高功因LLC諧振電源轉換器之研製
(Analysis and Implementation of a Single-Stage LLC Resonant Converter with High Power Factor)

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摘要(中)

本文主要為研製一單級高功因LLC諧振電源轉換器，電路拓樸中包含升壓型功因校正單元以及對稱半橋式LLC諧振直流/直流轉換單元。升壓型功因校正單元將升壓電感操作在不連續導通模式來達到自發性功因校正之功能。而轉換器之切換頻率是操作於L-L-C所構成的諧振頻率以上使得一次側開關達到零電壓切換、二次側整流二極體達到零電流切換，可提高轉換效率。此外，本文採用變頻控制以維持輸出電壓穩定並有效減少儲能電容電壓所造成的開關應力。除了轉換器之工作原理分析與討論之外，本文以電腦模擬與實驗結果來驗證理論之正確性。實驗證明轉換器擁有最高效率91%，在所有負載範圍內功因皆達到0.99以上並且符合IEC 1000-3-2 Class-D之諧波規範。本文所提單級高功因LLC諧振電源轉換器具有架構簡單、低成本、變頻控制、高功因、高轉換效率等特點。

摘要(英)

A single-stage LLC resonant converter with high power factor is proposed in this thesis. The proposed converter consists of a boost-PFC cell and a symmetrical half-bridge LLC resonant dc/dc cell. The boost- PFC cell works in discontinuous conduction mode (DCM) functions for achieving self-PFC. The switching frequency of the proposed converter is designed to be higher than the L-L-C resonant frequency, resulting in zero voltage switching (ZVS) on primary power switches and zero current switching (ZCS) on secondary rectifier; hence one can improve the conversion efficiency. Furthermore, a variable frequency controller is adopted for achieving output voltage regulation of the proposed single-stage LLC resonant converter and suppressing the voltage of bulk capacitor. Besides, the operating modes and dc characteristics are discussed for designing the proposed converter. Finally, the computer simulations and experimental results verify the performance as theory prediction. The proposed converter successfully meets IEC 1000-3-2 Class-D requirements and the conversion efficiency can be achieved up to 91% under rated condition. The proposed single-stage LLC resonant converter has the features of simple structure, low component count, variable-frequency control, high power factor, and high efficiency.

關鍵字(中)

★ 變頻控制
★ 零電流切換
★ 不連續導通
★ 單級
★ LLC諧振
★ 零電壓切換

關鍵字(英)

★ DCM
★ ZVS
★ ZCS
★ variable-frequency control
★ LLC resonant
★ single-stage

論文目次

中文摘要 I
英文摘要 II
目錄 III
圖目錄 VI
表目錄 X
第一章緒論 01
1.1 研究背景 01
1.2 研究目的與方向 02
1.3 論文大綱 05
第二章主動式功率因數校正技術 06
2.1 功率因數校正問題與定義 06
2.2 主動式功因校正電路之控制方法 11
2.3 升壓式電源轉換器功因校正之分析 17
第三章諧振電源轉換器分析 22
3.1 柔性切換技術 22
3.2 諧振電源轉換器分類 24
3.3 基本波分析 25
3.4 串聯諧振轉換器 27
3.5 並聯諧振轉換器 29
3.6 串並聯諧振轉換器 31
3.7 LLC諧振轉換器 34
第四章單級高功因LLC諧振電源轉換器 48
4.1 系統架構 48
4.2 電路說明 50
4.3 電路動作原理分析 51
4.4 電源轉換器控制方式 78
第五章實驗與模擬 79
5.1 電路規格以及實作電路架構 79
5.2 模擬波形與實驗波形 80
5.3 實測與模擬結果討論 97
5.4 轉換器性能分析 99
5.5 負載調整率 102
5.6 實作電路照片 103
第六章結論與未來研究方向 104
6.1 結論 104
6.2 未來研究方向 105
參考文獻 107
發表著作 113
作者簡歷 116

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指導教授

徐國鎧(Kuo-Kai Shyu)

審核日期

2006-6-30

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