LLC谐振变换器中“Y”型磁集成变压器设计

Design of "Y" type magnetic integrated transformer in LLC resonant converter

为解决三相LLC谐振变换器体积占比较大问题,提高变换器的功率密度,采用三相“Y-Y”型交错LLC谐振变换器拓扑结构,分析工作原理,建立谐振网络基波等效模型.根据变压器磁集成原理,设计一种新的“Y”型磁芯结构,并通过建立磁路模型,进行变压器参数设计.利用ANSYS软件对新型变压器进行建模和磁通分析,搭建输出功率为600 W,电压为400 V/48 V的实验样机.研究结果表明:设计的磁芯结构使变换器体积显著降低,工作效率提高,拓扑结构的均流效果较好,“Y”型磁芯结构设计更简便、变压器参数设计合理.

In order to solve the problem that the volume of the three-phase LLC resonant converter is relatively large and improve the power density of the converter,the topology of the three-phase Y-Y interleaved LLC resonant converter is adopted,the working principle is analyzed,and the equivalent model of the fundamental wave of the resonant network is established.Based on the principle of transformer magnetic integration,a new"Y"-shaped magnetic core structure is designed.By establishing a magnetic circuit model,the parameters of the transformer are designed.The ANSYS software is used to model and analyze the magnetic flux of the new transformer.An experimental prototype with output power of 600 W and voltage of 400 V/48 V is designed.The research results show that the designed magnetic core structure can significantly reduce the volume of the converter,improve the working efficiency,and the current sharing effect of the topology structure is better.The design of transformer parameters is reasonable.