反激式变换器的变压器线圈涡流损耗机制分析与新型损耗模型

反激变换器的变压器线圈涡流损耗为高频功率磁元件线圈技术的研究热点之一。在已有研究基础上，应用电磁场有限元仿真以及通过分解线圈电流分析了反激变换器的变压器线圈涡流损耗机制，发现其线圈窗口磁场兼有电感器和变压器磁场的特征。据此机制，研究了减小其线圈涡流损耗的方法，指出该方法的有效性取决于线圈窗口磁场的构成。通过研究其线圈窗口磁场的正交性，进一步提出一种新型反激变换器的变压器线圈损耗解析模型。有限元数值仿真验证了研究结果的正确性。

Mechanism Investigation and Analytical Modeling for Winding Loss of Flyback Transformer

Winding eddy current loss of the transformer in flyback converter is one of the research focus in winding techniques of high-frequency power magnetic components. Based on the reviewing for the previous researches, the winding loss mechanism of the transformer is analyzed deeply through decomposition of winding current and Finite Element field simulation. And it is found that the magnetic fields inducing the total winding loss have both behaviors with inductor’s and transformer’s field. With this understanding, the techniques for reducing the winding loss are researched to conclude that the effectiveness of the techniques depends on the magnetic field constitutes in winding window. Moreover, a new analytical model for the transformer winding loss in flyback converter is also proposed by utilizing the orthogonality of the two field components. The research results are approved by finite element simulation.