摘要：傳統有源功率因數校正電路中導通器件多，通態損耗大，不適于中大功率場合應用。新穎的單相功率因數校正電路——無橋Boost拓撲，其結構簡單，效率高。本文基于無橋Boost電路，提出一種單周期控制方法，它不需要檢測輸入電壓信號且不需使用乘法器就能實現功率因數校正。單周期控制電路簡單可靠，又降低了成本。本文分析了無橋Boost電路及單周期控制的工作原理，并導出了控制系統的穩定性條件。 敘詞：功率因數校正 無橋Boost 單周期控制 Abstract：This paper presents a new power factor correction (PFC) method for Bridgeless Boost converter based on one-cycle control.　The proposed topology has fewer semiconductor components compared to the conventional Boost-type rectifier with input power factor correction.　The control circuit of one-cycle control is simple and reliable without multipliers and input voltage sensor.　The concept of Bridgeless Boost PFC and one-cycle control is described.　Stability analysis is also detailed in this paper. Keyword：PFC Bridgeless Boost One-Cycle Control