臺灣博碩士論文加值系統

　　本論文主要研製與比較主動前位順向式與非對稱半橋交流/直流電源供應器，電源轉換器為雙級架構，前級為主動式功因修正電路，而後級則具有同步整流功能之直流/直流轉換器。其中直流/直流轉換器分別採用主動箝位順向式架構與非對稱半橋架構，並分析與比較電路架構，此二種電路架構操作特性相似，且都具有零電壓切換良好之特性。另外，為減少電源轉換器的空載損失，當轉換器空載時，中斷功因修正器與同步整流電路以減少功率消耗，並使用脈波省略技術降低直流/直流轉換器在空載時的損失。最後，經由實作完成輸出直流12V/8A，滿載效率87%以上，功率因數0.95 以上之二種電源轉換器之原型機作為理論分析之驗證。

　This thesis mainly studies and implements two two-stage AC/DC power converters. The front-stage is a power factor correction circuit and the second-stage is a soft-switching DC/DC converter with synchronous rectifier. The DC/DC converter applies active clamp forward converter and asymmetrical half-bridge converter individually. These two circuits have similar zero-voltage-switching operating features, and the main circuit has the same number of components. A comparison between the two topologies is made in this thesis. The power consumption at no load condition can be reduced by disabling the power factor correction circuit and synchronous rectifier. In addition, the pulse skip scheme is used to reduce the losses of the converter at no load condition. Experimental results show that both these two prototypes can achieve 87% efficiency and 0.95 power factor at DC 12V/8A output condition.

中文摘要　Ⅰ
英文摘要　Ⅱ
誌 謝　Ⅲ
目 錄　Ⅳ
圖目錄　Ⅵ
表目錄　Ⅸ
符號表　Ⅹ
第一章　緒論　1
　1.1　研究背景　1
　1.2　研究目的與方向　2
　1.3　論文大綱　4
第二章　功因修正電路之分析　5
　2.1　前言　5
　2.2　功因修正電路介紹　6
第三章　主動箝位順向式轉換器與非對稱半橋轉換器　11
　3.1　前言　11
　3.2　順向式轉換器　13
　3.3　主動箝位順向式轉換器　16
　　3.3.1　主動箝位順向式轉換器動作原理　17
　　3.3.2　主動箝位順向式轉換器穩態特性分析　27
　3.4　非對稱半橋轉換器　29
　　3.4.1　非對稱半橋轉換器動作原理　30
　　3.4.2　非對稱半橋轉換器穩態特性分析　41
第四章　同步整流電路與空載損耗分析　45
　4.1　前言　45
　4.2　同步整流電路之驅動與應用　46
　4.3　空載損失來源與改善對策　51
第五章　電路設計與實驗結果分析　54
　5.1　前言　54
　5.2　功因修正電路設計　56
　5.3　主動箝位順向式轉換器電路設計　58
　5.4　非對稱半橋轉換器電路設計　60
　5.5　降低空載損耗控制電路　63
　5.6　實驗結果與分析　67
　　5.6.1　實測波形　69
　　5.6.2　功率因數與電流總諧波失真測量　75
　　5.6.3　效率分析　78
　　5.6.4　空載損失實測結果　80
第六章　結論及未來研究方向　81
　6.1　結論　81
　6.2　未來研究方向　82
參考文獻　83

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