This paper proposes a balanced feedforward current-sense current-compensation (CSCC) common-mode (CM) active electromagnetic interference (EMI) filter (AEF). The advantages of the feedforward CSCC-type AEF are theoretically demonstrated. The operation of the proposed AEF is completely analyzed, and practical design guidelines are developed regarding performance and stability. The proposed AEF is applied to an L–C–L EMI filter for a 2.2 kW resonant inverter, and CM noises are further reduced by 3 to 18 dB from 150 kHz to 10 MHz. The problem of CM-to-differential mode noise transformation due to an unbalanced AEF structure is also investigated by the measurements using a vector network analyzer.

中文翻译：

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用于降低共模噪声的平衡前馈电流检测电流补偿有源 EMI 滤波器

本文提出了一种平衡前馈电流检测电流补偿 (CSCC) 共模 (CM) 有源电磁干扰 (EMI) 滤波器 (AEF)。从理论上证明了前馈 CSCC 型 AEF 的优点。对提议的 AEF 的操作进行了全面分析，并制定了有关性能和稳定性的实用设计指南。建议的 AEF 应用于 2.2 kW 谐振逆变器的 L–C–L EMI 滤波器，并且 CM 噪声从 150 kHz 到 10 MHz 进一步降低了 3 到 18 dB。还通过使用矢量网络分析仪的测量来研究由于不平衡 AEF 结构导致的 CM 到差模噪声转换的问题。