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MOSFET输出电容对CLLLC谐振变换器特性影响分析

, PP. 26-35

Keywords: 双向变换器,LLC谐振变换器,软开关,MOSFET输出电容,间歇模式

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Abstract:

在详细分析MOSFET输出电容对CLLLC谐振变换器运行原理和工作特性影响的基础上,针对MOSFET输出电容在续流阶段会产生振荡的问题,提出一种优化的参数设计方法,可在保持自然软开关特性的同时减轻振荡;针对由输出电容引起的变换器轻空载工作时输出电压漂高的问题,采取电压滞环间歇模式控制,可有效将输出电压调节至额定值,同时降低变换器轻空载工作时的损耗;最后,搭建了一台1kW、400V/48V的实验样机,实验结果证明了所提优化设计和控制策略的正确性和可行性。

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