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With the rise of digital control technology, digital controllers have also been used to suppress Electromagnetic Interference (EMI). In this paper, a digital active EMI filter (DAEF) circuit and method based on analytical reconstruction of switching spectrum is proposed, which can realize the simultaneous suppression of common-mode and differential -mode noise with good EMI suppression effect on the basis of fewer circuit links, lower cost, and smaller size for periodic noise. The simulation results show that two iterations can achieve 20–30 dB common-mode EMI attenuation and 30–40 dB differential-mode EMI attenuation in the low and medium frequency bands. And EMI suppression can be improved through continuous iteration.

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A Digital Active EMI Filter Circuit and Method Based on Analytical Reconstruction of Switching Spectrum

  • 会议论文

  • 发表日期：

    2026年

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  • Yongqi Huo,
  • Wenjie Chen,
  • Hongpeng Wang,
  • Chufan Zhou,
  • Huibin Wu,
  • Wenjie Du,
  • Shimin Lian

摘要

With the rise of digital control technology, digital controllers have also been used to suppress Electromagnetic Interference (EMI). In this paper, a digital active EMI filter (DAEF) circuit and method based on analytical reconstruction of switching spectrum is proposed, which can realize the simultaneous suppression of common-mode and differential -mode noise with good EMI suppression effect on the basis of fewer circuit links, lower cost, and smaller size for periodic noise. The simulation results show that two iterations can achieve 20–30 dB common-mode EMI attenuation and 30–40 dB differential-mode EMI attenuation in the low and medium frequency bands. And EMI suppression can be improved through continuous iteration.