An improved novel driving scheme of synchronous rectifiers for LLC resonant converters

An improved novel driving scheme of synchronous rectifiers for LLC resonant converters
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DOI：
10.1109/apec.2008.4522769
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发表时间：
2008-05
期刊：
2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition
影响因子：
--
通讯作者：
D. Fu;Ya Liu;F. Lee;Ming Xu
D. Fu;Ya Liu;F. Lee;Ming Xu
中科院分区：
其他
文献类型：
--
作者：
D. Fu;Ya Liu;F. Lee;Ming Xu

文献摘要

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提出了一种改进的新型谐振变换器同步整流器驱动方案。它非常适用于高频、高效率、高功率密度的谐振变换器。设计并分析了一种同步整流LLC谐振变换器。与建议的驱动方案，SR体二极管导通几乎减少到零。消除了SR的反向恢复问题。电流和电压应力都大大降低。SR的导通损耗和开关损耗大大降低。实验结果表明，所提出的LLC谐振变换器与SR可以实现低应力，高效率和高功率密度。
This paper proposes an improved novel synchronous rectifier (SR) driving scheme for resonant converters. It is very suitable for high frequency, high efficiency and high power density dc-dc resonant converters with SRs. An LLC resonant converter with proposed synchronous rectification is designed and analyzed. With proposed driving scheme, SR body diode conduction is almost reduced to none. The reverse recovery problem of SRs is eliminated. Both current and voltage stress are greatly decreased. Conduction loss and switching loss of SRs are considerably reduced. The experimental results show that the proposed LLC resonant converter with SR can achieve low stresses, high efficiency and high power density.