差共模噪声相互转化机理及在平面EMI滤波器设计中的应用

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摘要 EMI滤波器是抑制传导干扰的重要元件。论文对差、共模混合噪声电路在“阻抗失配”的基础上,可以分离为两部分独立的等效通道。对两个通道各自加载差模和共模噪声,求解电路网络,在负载端可以得到差、共模干扰噪声。由此,可以得到由于支路阻抗的不对称而引起的差、共模噪声之间的相互转化。基于环形结构的平面EMI滤波器是本课题组提出的一种新型结构,但是仍然存在对应支路阻抗不对称问题引起噪声相互转化的问题。为此,本文提出一种单面完全覆金属的“感容”集成模块(LC单元),与双面均为螺旋型LC单元进行比较表明,所提出的模块具有良好对称性,能更好地抑制平面滤波器差、共模噪声之间的相互转化。

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	王世山
	龚敏
	虞振洋

关键词 ：平面EMI滤波器, 差模噪声, 共模噪声, 噪声转化, 有限元

Abstract：EMI filter is an important component to suppress the conducted EMI noise. Based on “impedance mismatch”, the DM and CM circuit can be separated into two independent equivalent channels. Applying DM and CM noise for each channel, the DM and CM interference noise can be achieved in the load by solving the circuit network. Thus, the transformation between the DM and CM noise can be obtained, which caused by the asymmetric branch impedance. The important conclusions are achieved, that is, inhibiting the “CM noise from the DM excitations” is more difficult. Annular planar EMI filter is a new structure proposed by our research group, but there are still existing the transformation problems, which caused by the asymmetric branch impedance. Therefore, in this paper, a new kind of “LC” integrated module with one side fully covered with metal(LC unit) is proposed. Meantime, it is compared with the LC unit which has spiral on both sides. Research shows that, the proposed model has a good symmetry and can effectively reduce the transformation between the DM and CM noise.

Key words： Planar EMI filter differential noise(DM) common noise(CM) noise transformation finite element method(FEM)

收稿日期: 2013-09-22 出版日期: 2014-06-18

PACS:	TM133
	TM713

基金资助:国家自然科学基金(51177071)、台达环境与教育基金会《电力电子科教发展计划》(DREK2013004)和江苏省高校优秀科技创新团队项目资助

作者简介: 王世山男,1967年生,博士,副教授,研究方向为电力电子系统的电磁兼容,电气设备的多物理仿真技术。龚敏女,1989年生,硕士研究生,研究方向为电力电子系统的电磁兼容。

引用本文:

王世山, 龚敏, 虞振洋. 差共模噪声相互转化机理及在平面EMI滤波器设计中的应用[J]. 电工技术学报, 2014, 29(2): 239-246. Wang Shishan, Gong Min, Yu Zhenyang. Theoretical Investigation of Mutual Transformation between Differential Mode and Common Mode Noise and Its Implementation in the Design of Planar EMI Filter. Transactions of China Electrotechnical Society, 2014, 29(2): 239-246.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I2/239

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