隔离变换器屏蔽优化共模EMI降噪技术

2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC) Pub Date : 2016-05-17 DOI:10.1109/APEMC.2016.7522816

Shijun Yang, Qingbin Chen, Wei Chen

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引用次数: 3

摘要

在绝缘变流器中，夹层绕组通常用于低导通损耗和低漏感。但由于初级和次级绕组之间较大的寄生电容，它也容易恶化共模(CM) EMI噪声。本文分析了典型隔离式变换器的CM噪声传递路径。研究了屏蔽装置不同接地点对CM噪声的影响。提出了一种通过优化屏蔽与绕组间距来降低CM噪声的新方法。所提出的概念和策略的优点在一个反激变换器上得到了验证和验证。实现了20dB CM以上的噪声衰减。

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Common mode EMI noise reduction technique by shielding optimization in isolated converters

Sandwich winding is usually used for low conduction loss and low leakage inductance in insolated converters. But it also tends to deteriorate the common mode (CM) EMI noise because of the bigger parasitic capacitances between primary and secondary windings. This paper analyzes the CM noise transferring path for typical isolated converters. Influence of different ground point location of the shielding on CM noise is investigated. A novel CM noise reduction method by optimizing the spacing between shielding and windings is proposed. The advantages of the proposed concepts and strategies are verified and demonstrated on a Fly-back converter. More than 20dB CM noise attenuation is achieved.

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2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)

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