摘要
大功率LLC谐振变换器的谐振电感磁路结构大多采用单气隙结构,存在局部过热、温升过高等问题。针对这些问题,文章提出了一种三气隙磁路结构的谐振电感,并采用有限元分析法,基于Ansys分别建立了单气隙和三气隙谐振电感的三维非线性数学模型,分别进行了电磁热场耦合模拟,计算出了各谐振电感的磁场和温度场矢量曲线。对比单气隙和三气隙的仿真结果,得出了三气隙的谐振电感具有降低温升、避免局部过热和减少损耗的优点。此外,通过多次仿真模拟,给出了三气隙位置的优化曲线,为谐振电感的优化设计提供了参考。
Single air-gap structure has been commonly used in resonant inductor for high power LLC resonant converter, which may cause some problems such as local overheating, high temperature rise, etc.. Aiming at these problems, a resonant inductor with three-air- gap magnetic structure was presented. Based on the finite element theory and Ansys, three-dimensional （3D） mathematic models of single air-gap resonant inductor and three-air-gap resonant inductor were respectively built and the magnetic-thermal coupling simulations were completed to obtain the vector curves of electromagnetic field and thermal field. Besides, compared with the simulation results of single air-gap and three-air-gap resonant inductor, it shows that three-air-gap resonant inductor has the advantages of reducing temperature rise, preventing local overheating and decreasing loss. Through many simulations, the optimal curves of three-air-gap location were given, which had important significance to the optimization design of resonant inductor.
出处
《大功率变流技术》
2015年第4期80-84,共5页
HIGH POWER CONVERTER TECHNOLOGY
关键词
LLC谐振变换器
谐振电感
分段气隙
电磁热场模拟
优化设计
LLC resonant converter
resonant inductor
tapped air-gap
magnetic-thermal coupling simulation
optimization design
