摘要
本論文主旨在於討論無橋式功率因數修正器之設計，首先針對各種升壓型功率因數修正器及控制策略進行分析與比較，最後以雙開關無橋式作為主電力電路架構，採用固定切換頻率及平均電流控制模式，以降低輸入電流諧波，並使輸入電流與電壓同相，達到單一功率因數與提高轉換效率的目的。
在實作上係以L4981做為控制IC，研製一500W之功率因數修正器。實驗結果驗證了所採控制技術之正確性與可行性，同時也提及後續可能的研究方向，以期更為提高功率規格及效率，並解決散熱之問題。

關鍵字 : 無橋式功率因數修正器、功率因數

Abstract
In this thesis, a bridgeless power factor corrector (PFC) is studied and implemented. Various topologies and control methods for PFC are analyzed and compared. The presented power circuit is a two-switch bridgeless boost PFC which utilizes fixed switching frequency and average-current mode control to reduce input current harmonics and allow input current to be in phase with the input voltage. And therefore, unity power factor and higher efficiency can be resulted.
For comparisons, two 500-W PFCs, conventional single-switch and bridgeless topologies, are implemented with the same control IC L4981. The experimental results verify the validity and feasibility of the adopted control technique.

Keywords: Bridgeless power factor corrector, power factor.

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