一种兼顾效率和电磁兼容的反激变压器设计

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摘要三明治绕法通常用来增大变压器初、次级绕组之间的耦合系数,减小漏感,提高电源整体效率。但该方法往往会恶化共模传导电磁干扰。本文基于次级绕组净感应电荷的理论模型,深入分析了屏蔽体接地点位置及屏蔽高度对变压器共模传导EMI的影响。提出在反激变压器采用三明治绕法的同时,调节屏蔽层与次级绕组之间间距的方法来兼顾整个系统的效率和电磁兼容问题。采用优化设计的反激变压器使得系统的效率提高2.31%,共模传导EMI改善了15dB。实验结果验证了理论分析的正确性和实际有效性。

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	曾智强
	郑心城
	陈为

关键词 ：反激变压器, 效率, 共模传导EMI, 优化设计

Abstract：Sandwich winding is often used to reduce the transformer losses because of increasing the coupling coefficient transformer between primary winding and secondary winding and reducing the leakage inductance. But it tends to worsen common-mode electromagnetic interference. This paper analyzes the common-mode electromagnetic interference characteristics of the transformer by changing the height of Shield and the location of grounding point based on the model of induced charge in the secondary side. Sandwich winding is used, while using some shielding and adjusting spacing between shield and the secondary winding to improve transformer common-mode electromagnetic interference characteristics are proposed. By means of optimization design of common-mode electromagnetic interference and efficiency of the Fly-back transformer, the prototype is manufactured and tests are carried. The results show that the efficiency is improved by 2.31%, and common-mode electromagnetic interference is reduced by 15 dB. Finally, the model is verified with experimental results.

Key words： fly-back transformer efficiency common-mode electromagnetic interference optimization design

出版日期: 2015-10-28

作者简介: 曾智强（1990-）,男,福建省泉州市人,硕士研究生,主要从事电力电子功率变换及高频磁技术的研究。

引用本文:

曾智强, 郑心城, 陈为. 一种兼顾效率和电磁兼容的反激变压器设计[J]. 电气技术, 2015, 16(10): 8-12. Zeng Zhiqiang, Zheng Xincheng, Chen Wei. The Balanced of Efficiency and Electromagnetic Compatibility for Fly-back Transformer Design. Electrical Engineering, 2015, 16(10): 8-12.

链接本文:

http://dqjs.cesmedia.cn/CN/Y2015/V16/I10/8

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