An Improved Buck PFC Converter With High Power Factor
An Improved Buck PFC Converter With High Power Factor
复制标题
一种改进的高功率因数降压PFC变换器
DOI：
10.1109/tpel.2012.2214060
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发表时间：
2013-05-01
影响因子：
6.7
通讯作者：
Liu, Shirong
中科院分区：
文献类型：
--
作者：
Xie, Xiaogao;Zhao, Chen;Liu, Shirong
提出了一种改进的降压功率因数校正（PFC）变换器拓扑结构。通过增加一个辅助开关和两个二极管，可以消除传统降压型PFC变换器交流输入电流中的死区。提出了一种改进的恒导通控制方法，并将其应用于改进的降压型PFC变换器，使其工作在临界导通模式（CRM）。通过优化控制参数，在通用输入电压范围内，可以实现接近单位功率因数，输入电流谐波满足IEC61000-3-2 C类标准。此外，与传统的降压变换器相比，该变换器的效率没有下降。对所提出的变换器进行了详细的理论分析和优化设计考虑，并通过一个100w的实验室样机进行了验证。
An improved buck power factor correction (PFC) converter topology is proposed in this paper. By adding an auxiliary switch and two diodes, the dead zones in ac input current of traditional buck PFC converter can be eliminated. An improved constant ON-time control is proposed and utilized in this improved buck PFC converter to force it that operates in critical conduction mode (CRM). With optimal control parameters, nearly unit power factor can be achieved and the input current harmonics can meet the IEC61000-3-2 class C standard within the universal input voltage range. Moreover, the efficiency of the proposed converter is not deteriorated compared to the conventional buck converter. Detailed theoretical analysis and optimal design considerations for the proposed converter are presented and verified by a 100-W lab-made prototype.