基于Maxwell 3D的LLC谐振变换器仿真分析  

Simulation analysis on LLC resonant converter based on Maxwell 3D

作　　者：崔倩 周洁敏[1] 汪洋 郑罡[1] 李少凡 CUI Qian;ZHOU Jie-min;WANG Yang;ZHENG Gang;LI Shao-fan(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学民航学院,江苏南京210016

出　　处：《磁性材料及器件》2022年第2期31-38,共8页Journal of Magnetic Materials and Devices

摘　　要：对半桥LLC谐振变换器的主电路和变压器进行了设计,利用基波近似法分析了半桥LLC谐振变换器的增益幅频特性,在变压器的设计上,首先采用AP法进行粗略设计,其次采用与传统查表法不同的仿真分析法对变压器的损耗进行分析。利用Maxwell 3D软件,通过改变变压器磁芯的气隙大小、不同的磁芯材料以及磁芯形状进行损耗仿真和效率比较,选择效率最高TDK公司的PC95材料ETD39型号中柱开气隙的设计方案进行原理样机的制作。实验表明,与之前的变压器相比,新方法所设计的变压器使整机效率提升至94.57%左右,且样机实现了LLC谐振变换器的软开关特性,输出电压稳定性较好,证明了设计的有效性。The main circuit and transformer of the half bridge LLC resonant converter are designed in this paper. The gain amplitude frequency characteristics of the half bridge LLC resonant converter are analyzed by using the First Harmonic Approximation method. In the design of the transformer, the AP method is first used for rough design, and then the simulation analysis method which is different from the traditional look-up table method is used to analyze the loss of the transformer. By using Maxwell 3D software, through changing the size of the air gap of the transformer core, different core materials and core shape, the loss simulation and efficiency comparison are carried out, and the design scheme of open air gap in the center pillar of ETD39, the PC95 material of TDK company with the highest efficiency, is selected to make the prototype. The experimental results show that, compared with the previous transformer, the efficiency of whole machine whose transformer is designed by the new method is improved to 94.57 %, and the prototype realizes the soft switching characteristics of LLC resonant converter, and the output voltage has good stability, which proves the effectiveness of the design.

关 键 词：变压器 LLC谐振变换器 仿真 

分 类 号：TM41[电气工程—电器]