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首页> 外文期刊>IEEE Transactions on Electromagnetic Compatibility >Determination of the Width of Shielding Foil in Sandwiched Winding Transformer for Minimizing Common Mode EMI of Flyback Converters
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Determination of the Width of Shielding Foil in Sandwiched Winding Transformer for Minimizing Common Mode EMI of Flyback Converters

机译：夹层绕组变压器中屏蔽箔宽度最小化反激式转换器的共模EMI的宽度

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摘要

Sandwiched winding is widely used in transformer design due to its low AC resistance and small leakage inductance. However, the expansion of winding coupling area causes the increasing of common mode (CM) electromagnetic interference (EMI). Shielding method is the most effective way to reduce coupling inside the isolated transformer. Yet the foil shielding design of sandwiched winding transformer has rarely been involved, for purpose of suppressing the CM EMI in flyback converter. In this work, we propose a method to determine the optimal width of a double-layer foil shielding in the primary-secondary-primary sandwiched winding transformer, for minimizing the conducted CM EMI of flyback converters. The equipotential distribution and the structural capacitance are analyzed, and the model of equivalent CM capacitance is established to calculate the minimum CM current flowing through the sandwiched winding transformer. The proposed method is validated through comparison of calculated and measured results.
机译：由于其低交流电阻和小漏电感，夹层绕组广泛用于变压器设计。然而，绕组耦合区域的扩展导致常用模式（CM）电磁干扰（EMI）的增加。屏蔽方法是减少隔离变压器内部耦合的最有效方法。然而，夹层绕组变压器的箔屏蔽设计很少参与，目的是在反激式转换器中抑制CM EMI。在这项工作中，我们提出了一种方法来确定初级 - 次级初级夹层绕组变压器中的双层箔屏蔽的最佳宽度，以最小化反激式转换器的导电CM EMI。分析等电位分布和结构电容，并且建立了等效CM电容的模型以计算流过夹层绕组变压器的最小CM电流。通过比较计算和测量结果来验证所提出的方法。

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