【摘要】 在开关电源中,高速的开关造成了严重的共模噪声干扰。介绍了一种应用于开关电源的有源共模EMI滤波器。该有源滤波器基于电流检测、电流补偿的原理,以高速运放为核心。试验证明,该有源滤波器对共模噪声的抑制能力比无源器件高20dB。更多还原

【Abstract】 SMPS, due to their high speed switching operation, draw a substantial amount of Common Mode (CM) noise. This paper presents the design of an Active CM EMI Filter (ACEF) for SMPS. The proposed filter is based on the current sensing and compensation circuit and it utilizes a fast amplifier for the current compensation. The proposed circuit can provide 20 dB more CM noise attenuation compared to passive LC filter, which is verified by experimental results.更多还原