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同步控制双向LLC谐振变换器

, PP. 87-96

Keywords: 双向,谐振变换器,电压增益,软开关,高效率

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Abstract:

本文提出了一种同步控制的双向LLC谐振变换器.为使变换器在正向,反向工作时拓扑结构相同,在电路中增加了一个辅助电感.该辅助电感除了可以使双向LLC谐振变换器的双向工作特性完全对称外,还可以帮助开关管实现软开关.文章提出的双向LLC谐振变换器结构简单,控制方法易于实现.当变换器开关频率小于谐振频率时,所有开关管均可以实现零电压开通(ZVS);当变换器开关频率大于等于谐振频率时,软开关特性与传统LLC谐振变换器相同.因此变换器具有较高的效率,很适合应用于能量双向流动的场合.同步控制的双向LLC谐振变换器与传统二极管整流的单向LLC谐振变换器的工作特性存在差别,为了精确分析,文章提出了新的等效电路模型,并给出了同步控制双向LLC谐振变换器的电压增益公式和软开关条件.最后通过实验验证了理论分析的结果.

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