交错并联磁集成双向LLC谐振变换器的高轻载效率控制方法  

High Light-load Efficiency Control Method for Interleaved Magnetic Integrated Bidirectional LLC Resonant Converter

作　　者：杨玉岗[1] 李恒 孙晓钰 YANG Yugang;LI Heng;SUN Xiaoyu(Faculty of Electrical and Control Engineering,Liaoning Technical University,Huludao 125105,China)

机构地区：[1]辽宁工程技术大学电气与控制工程学院,葫芦岛125105

出　　处：《电源学报》2022年第1期20-27,共8页Journal of Power Supply

基　　金：国家自然科学基金资助项目(U1510128);辽宁省教育厅重点实验室基础研究资助项目(LZ2015045)。

摘　　要：应用交错并联技术,可以有效扩充LLC谐振变换器的容量,但增多的通道数会造成变换器轻载效率低的问题。针对这一问题,以交错并联磁集成双向LLC谐振变换器为研究对象,在采用谐振电感反向耦合实现两相变换器自动均流的基础上,分析了变换器的工作原理和工作特性,提出了一种移相控制+变频控制+相屏蔽控制的控制策略,并给出了具体的实现方法。最后,制作了输出功率1000 W、48 V/400 V的实验样机。通过对比实验,验证了所提方案的有效性。The capacity of an LLC resonant converter can be effectively expanded using the interleaved technique.However,the added channels will cause the low light-load efficiency of the converter.To solve this problem,an interleaved magnetic integrated bidirectional LLC resonant converter is taken as the research object in this paper.On the basis of realizing the automatic current sharing of a two-phase converter by means of reverse coupling between resonant inductors,the operation principle and characteristics of the converter are analyzed.Moreover,a control strategy of phase shift+variable frequency+phase shielding is proposed,and the implementation method is given in detail.Finally,an experimental prototype with output power of 1000 W and 48 V/400 V was built,and the result of a comparative experiment verified the effectiveness of the proposed scheme.

关 键 词：交错并联磁集成 双向LLC谐振变换器 移相+变频+相屏蔽控制 自动均流 

分 类 号：TM46[电气工程—电器]