開關電源功率因素校正（PFC）及其工作原理

摘要：從分析高次諧波與功率因數校正的關系入手，說明提高功率因數的基本原理。針對應用廣泛的單相高頻開關電源，著重分析對比單相功率因數校正實現的方法以及控制方案。最后給出功率因數校正技術的發展方向。 敘詞：開關電源 功率因數校正 高次諧波 Abstract：The article explains the basic principles of improving power factor, following the analysis of the relationship between higher harmonic and power factor correction. The focus is on the ways of realizing single-phase PFC and relevant control schemes, targeting the widely-used single-phase switch power supply. Finally the right direction for PFC technology is provided.Key words: Switch power supply, Power factor correction, High harmonic. Keyword：Switch power supply, Power factor correction, High harmonic