臺灣博碩士論文加值系統

切換式電源供應器中之交直流轉換器電路，大多由功率因數改善與直流對直流轉換兩級電路串聯而成。此雙重電源轉換過程，導致整體效率降低。有鑑於此，本文乃企圖發展一高功因高效率之並聯型交直流轉換器，來改善目前轉換器之缺點。首先，本文使用直接能量轉換方式的boost-flyback功率因數改善電路，將一部分輸入能量直接傳遞給負載，達到提高系統整體效率之功用。其餘的能量則由順向式轉換器轉換，以穩定輸出電壓。此外，亦針對單開關架構之整體效率問題，提出雙開關法來加以取代，以進一步提升整體轉換器效率。所提出之轉換器電路，經由特性分析、模擬與實驗測試，證明其確實可以達到高功因(99%以上)及高效率(80%以上)之要求。同時，輸入電流總諧波失真因數在15%以下，輸出電壓調整率在1%以內，顯示所完成之轉換器雛型具有可行性。

The ac/dc power converter circuit of a conventional switching mode power supply is a two-stage cascade combination of a power factor corrector and a dc/dc converter. The main drawback of this configuration is the low efficiency since the power conversion is processed twice. Therefore, The main objective of this thesis is to design and implement a parallel ac/dc power converter with high power factor and high efficiency. First, The boost-flyback power factor corrector is used for the direct power transformation to increase the efficiency of the whole system, and the remaining power is processed by a Forward converter to maintain tight output regulation. Furthermore, to increase conversion efficiency, the single-switch system is replaced by a two-switch system. IsSpice simulation and experimental test results of the proposed circuit show that the ac/dc converter can achieve high power factor (better than 0.99), and high efficiency (more than 80%). Besides, the THD of the ac input current is less than 15%, and the output voltage regulation is under 1%. These results validate the feasibility of the proposed system.

目 錄
頁次
中文摘要……………………………………………………………………………..….i
英文摘要……………………………………………………………………………..…ii
誌謝…………………………………………………………………………………....iv
目錄………………………………………………………………………………….....v
表目錄………………………………………………………………………………..viii
圖目錄………………………………………………………………………………... ix
第一章 緒論………………………………………………………………………......1
1-1 研究背景與動機……………………………………………………………..1
1-2 國內外相關研究概況………………………………………………………..2
1-3 研究貢獻……………………………………………………………………..5
1-4 論文架構……………………………………………………………………..6
第二章 切換式電源功應器………………………………………………………......7
2-1 簡介…………………………………………………………………………...7
2-1-1 線性電源供應器…………………………………………………....7
2-1-2 切換式電源供應器………………………………………………....8
2-2 昇壓式轉換器……………………………………………………………....10
2-3 返馳式轉換器……………………………………………………………....15
2-4 順向式轉換器……………………………………………………………....20
第三章 轉換器功因及效率之提升……………………………………………….....26
3-1 前言………………………………………………………………………...26
3-2 功率因數改善方法………………………………………………………...26
3-2-1 功率因數…………………………………………………………..26
3-2-2 主動功率因數改善電路之控制方法……………………………..28
3-2-3 昇壓式轉換器功率因數特性……………………………………..29
3-2-4 返馳式轉換器功率因數特性……………………………………..31
3-3 Boost-flyback功率因數改善電路…………………………………….34
3-4 順向式轉換器之功率因數改善電路…………………………………...34
3-4-1 工作原理…………………………………………………………..36
3-4-2 穩態特性分析……………………………………………………..46
3-5 Boost-flyback與順向混合式轉換器效率之改善……………………..48
3-5-1 能量轉換效率…………………………………………………...48
3-5-2 雙開關架構特性分析…………………………………………...57
第四章 轉換器電路設計、模擬與試驗……………………………………………....62
4-1 電路元件設計……………………………………………………………....62
4-2 電路模擬…………………………………………………………………....66
4-3 硬體雛型製作與試驗……………………………………………………....72
4-4 模擬及試驗結果比較……………………………………………………....81
第五章 結論與未來展望……………………………………………………………....83
5-1 結論………………………………………………………………………....83
5-2 未來展望…………………………………………………………………....83
參考文獻…………………………………………………………………………….....85
附錄A…………….................................................94
附錄B…........................................................98

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