考虑气隙边缘效应的高频变压器绕组结构优化

Winding Structure Optimization of High Frequency Transformer to Reduce the Effect of Air Gap Edge Field

为了降低高频变压器气隙边缘效应对绕组损耗的影响,以传统绕组结构为基础,提出了两种绕组优化结构,优化结构Ⅰ是将气隙附近的原边绕组移开,优化结构Ⅱ是将辅助绕组替换布置在气隙附近的原边绕组。采用有限元法,针对两种优化结构的高频变压器进行了计算,得到了绕组最大损耗密度,与传统结构的比较表明,工作频率越高,两种优化结构在降低气隙边缘效应的影响上的优势更加明显。搭建了反激式变换器联合仿真电路,计算得到了在相同条件下三种结构的绕组损耗,验证了两种优化结构在高频变压器工作频率范围内降低绕组损耗的可行性。在两种优化结构的基础上,采用交叉换位技术进一步降低了绕组损耗。上述措施为降低高频变压器绕组损耗提供了参考。

In order to reduce the effect of air gap edge field effect on winding loss in high frequency transformer, based on the traditional winding structure, two kinds of optimal winding structures are proposed. The optimized structure I removed the primary winding near the air gap. The optimized structure Ⅱ replaced the primary windings near the air gap with auxiliary windings. The finite element method wa used to calculate two kinds of high frequency transformers with optimized structure, and the maximum loss density of the windings was obtained, the comparison with the traditional structure shows that the higher the working frequency is, the more obvious the advantages of the two optimized structures in reducing the effect of gap edge field are. The combined simulation circuit of flyback converter was built, the windings losses of three structures were calculated under the same conditions, and the effectiveness of the two optimized structures was verified. Based on the two optimized structures, the cross-transposition technique was used to further reduce the winding loss. These measures provide a reference for reducing the windings loss of high frequency transformer.