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With the widespread application of wide-bandgap semiconductor devices, the electromagnetic interference (EMI) problem in power converters has become severer, thus imposing more rigorous demands on the filtering capabilities of EMI filters. Compared with passive EMI filter, active EMI filter (AEF) features a more compact structure and reduced weight. To further enhance the AEF’s insertion loss and align with the growing trend of high-power density in power converters, a dual feedback type current-sensing current-injecting (CSCI) AEF with cascaded structure for common mode (CM) EMI attenuation is designed in this paper. The principle of the cascaded AEF is described in detail. Meanwhile, experimental verification is conducted, and the results show that within the conducted EMI range, the cascaded CSCI AEF in this paper exhibit better filtering effects compared with the single-stage CSCI AEF.

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A Dual-Feedback Active CM EMI Filter with Cascaded Structure

  • 会议论文

  • 发表日期：

    2026年

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  • Weijun Wu,
  • Chengchao Hua,
  • Dong Deng,
  • Yechi Zhang

摘要

With the widespread application of wide-bandgap semiconductor devices, the electromagnetic interference (EMI) problem in power converters has become severer, thus imposing more rigorous demands on the filtering capabilities of EMI filters. Compared with passive EMI filter, active EMI filter (AEF) features a more compact structure and reduced weight. To further enhance the AEF’s insertion loss and align with the growing trend of high-power density in power converters, a dual feedback type current-sensing current-injecting (CSCI) AEF with cascaded structure for common mode (CM) EMI attenuation is designed in this paper. The principle of the cascaded AEF is described in detail. Meanwhile, experimental verification is conducted, and the results show that within the conducted EMI range, the cascaded CSCI AEF in this paper exhibit better filtering effects compared with the single-stage CSCI AEF.