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Switching mode power supply (SMPS) causes electromagnetic interference (EMI) as side effect. In practical applications, traditional passive EMI filter is a good solution for EMI attenuation but the size increase is obvious and the high frequency performance of passive EMI filter is not ideal considering parasitic components. Active EMI filter (AEF) is another kind of EMI filter which attenuates EMI with compensation signal. When the compensation signal is set with same magnitude and reverse phase compared with initial EMI noise, the noise attenuation achieved by AEF is decent. During the usage of AEF, the noise attenuation achieved is about 25 dB, and this is not sufficient enough considering size reduction for EMI filter. To cope with this problem, this paper proposes multi-stage AEF topologies to improve total noise attenuation ability. The noise attenuation improvement based on different topologies is calculated and an optimized topology is proposed. Experimental verification shows that the optimized topology could achieve a decent noise attenuation improvement and the total size is also tiny.

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Multi-stage AEF Topology Investigation with Improved Noise Attenuation Ability

  • 会议论文

  • 发表日期：

    2026年

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  • Yongxing Zhou,
  • Liang Shu,
  • Yigang Lin,
  • Yingmin You,
  • Ziran Wu,
  • Wei Chen,
  • Ruru Zheng,
  • Xiao Han

摘要

Switching mode power supply (SMPS) causes electromagnetic interference (EMI) as side effect. In practical applications, traditional passive EMI filter is a good solution for EMI attenuation but the size increase is obvious and the high frequency performance of passive EMI filter is not ideal considering parasitic components. Active EMI filter (AEF) is another kind of EMI filter which attenuates EMI with compensation signal. When the compensation signal is set with same magnitude and reverse phase compared with initial EMI noise, the noise attenuation achieved by AEF is decent. During the usage of AEF, the noise attenuation achieved is about 25 dB, and this is not sufficient enough considering size reduction for EMI filter. To cope with this problem, this paper proposes multi-stage AEF topologies to improve total noise attenuation ability. The noise attenuation improvement based on different topologies is calculated and an optimized topology is proposed. Experimental verification shows that the optimized topology could achieve a decent noise attenuation improvement and the total size is also tiny.