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Design Methodology of LLC Resonant Converters for Single-stage Power Factor Correction Application
Journal of Electrical Engineering & Technology ( IF 1.9 ) Pub Date : 2021-06-04 , DOI: 10.1007/s42835-021-00766-w
Yufei Zhou , Shuai Liu , Jiaqi Ren , Qibin Wu , Feng Hong , Ang Shen , Wei Xu

This paper proposes a new design methodology for LLC resonant converter with single-stage power factor correction (PFC) function. By designing the achievable gain of resonant tank at a certain point of the AC voltage higher than the required gain, its gain will satisfy the requirement of the whole AC line voltage cycle and lead to a good single-stage PFC design. By adjusting switching frequency and changing voltage gain along with the AC voltage, the converter can realize PFC with high efficiency. The proposed converter inherits the advantages of the traditional LLC resonant converter, including soft switching of power switches across the whole load range, buck-boost power conversion ability which benefits the optimization of the down-stream DC-DC converter. Gain characteristic and design consideration for PFC purpose are analyzed in detail. Experimental results are presented to show its validity and feasibility.



中文翻译:

用于单级功率因数校正应用的 LLC 谐振转换器的设计方法

本文提出了一种具有单级功率因数校正 (PFC) 功能的 LLC 谐振转换器的新设计方法。通过设计在高于所需增益的交流电压某一点上谐振回路的可实现增益,其增益将满足整个交流线电压周期的要求,并导致良好的单级 PFC 设计。通过调整开关频率和随着交流电压改变电压增益,转换器可以实现高效率的 PFC。所提出的转换器继承了传统 LLC 谐振转换器的优点,包括在整个负载范围内功率开关的软开关、升降压功率转换能力,有利于下游 DC-DC 转换器的优化。详细分析了 PFC 目的的增益特性和设计考虑。

更新日期:2021-06-04
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