应用于开关电源的有源共模EMI滤波器
An Active Common Mode EMI Filter for Switching Mode Power Supply
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20 dB。
关键字 开关电源,电磁干扰,共模噪声,有源滤波器
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.
Key words SMPS, EMI,CM noise, Active EMI filter
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