开关电源变压器传导共模EMI磁电综合模型

发布时间：2018-06-11 15:59

本文选题：变压器模型 + 漏磁场　；参考：《中国电机工程学报》2017年08期

【摘要】：传统的变压器电磁干扰(electromagnetic interference,EMI)模型仅考虑了电场耦合的容性效应,在低频段能准确评估变压器的电磁干扰特性,但在高频段,模型的理论分析与实测存在较大偏差。通过对变压器内部分布电场、漏磁场的磁电效应机理分析,指出变压器的传导EMI特性受到磁、电效应的综合影响,漏磁场对变压器高频段共模传输路径阻抗有较大影响。在此基础上,建立综合考虑分布电场、漏磁场影响的变压器传导共模EMI磁电综合模型,模型分析表明,漏磁场、分布电场的感性、容性等效参数的谐振是影响变压器高频段电磁干扰特性的关键因素。最后通过插入损耗测试验证新模型改善了EMI高频段的预测精度和EMI特性的评估效果。
[Abstract]:The traditional electromagnetic interference (EMI) model of transformer only considers the capacitive effect of electric field coupling, and can accurately evaluate the electromagnetic interference characteristics of transformer in low frequency band. However, there is a big deviation between the theoretical analysis and the actual measurement in high frequency band. Based on the analysis of the magnetoelectric effect mechanism of the internal distribution electric field and leakage magnetic field of the transformer, it is pointed out that the conduction EMI characteristics of the transformer are comprehensively affected by the magnetic and electric effects, and the leakage magnetic field has a great influence on the common mode transmission path impedance of the transformer in the high frequency band. On this basis, a transformer conduction common mode EMI magnetoelectric synthesis model considering the influence of distributed electric field and leakage magnetic field is established. The model analysis shows that the inductance of leakage magnetic field and distributed electric field is obtained. The resonance of capacitive equivalent parameters is the key factor to influence the electromagnetic interference characteristics of transformer in high frequency band. Finally, the new model is verified by insertion loss test to improve the accuracy of EMI prediction in high frequency band and the evaluation effect of EMI characteristics.
【作者单位】：福州大学电气工程与自动化学院;
【基金】：国家自然科学基金项目(51277032) 高等学校博士学科点专项科研基金(20133514120009) 福建省自然科学基金项目(2014J01178)~~
【分类号】：TM41

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