- 學位論文
半橋單級電力轉換器之研製
Design and Implementation of Half-Bridge Single-Stage Power Converter
摘要
一般轉換器為了要達到高功率因數，通常在電路輸入端加入主動式功因校正電路，也因為加入主動式功因校正電路，所以需要兩組控制電路，造成元件數量增加與電路體積變大，且能量經由兩級轉換器消耗，造成效率較低等缺點。 本論文所提半橋單級電力轉換器主要是整合半橋式功因校正電路與半橋式直流/直流轉換器，利用整合開關技術，合併成半橋單級電力轉換器，以減少控制電路與開關元件數。當所提半橋單級電力轉換器操作在不連續電流模式時，電路自然擁有良好的功因校正性能，基於控制電路簡化之原則，控制策略採用固定切換頻率與責任週期之方式，將電路操作在不連續模式，使轉換器達到高功因的效能。透過電路原理分析發現可將二次側輸出電感移除，相較於先前所提之單級電力轉換器，更具有節省輸出濾波電感器、降低成本之優勢。 本論文首先介紹電壓饋入式轉換器之整併過程，然後說明半橋單級電力轉換器之動作及設計，最後製作一百瓦電路以驗證電路動作原理與理論相符合。
並列摘要
A novel current-fed half-bridge single-stage power converter is proposed in this thesis, which is a combination of one half-bridge PFC and one half-bridge dc/dc converter to reduce control structure and the number of switches. When PFC operating in discontinuous conduction mode and fixed switching frequency, there is power factor correction in nature, and the control process is simplified. Further, compared to voltage-fed single-stage power converter, the proposed current-fed converter is advantageous to eliminate the output filter inductor. First, this thesis recommends the differences between the voltage-fed converter and the current-fed converter, then the operation of the current-fed single-stage power converter is analyzed. Finally, make a circuit of 100 watts in order to prove the principle and theory accord.