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基于开关电源的三相电磁干扰滤波器

, PP. 216-221

Keywords: 电气工程,电磁兼容,三相EMI滤波器,开关电源,共模电感

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Abstract:

为了抑制三相开关电源注入电网的电磁干扰(EMI),提出了三相EMI滤波器的设计方法。构建了三相共模、差模滤波器的理想等效电路,并分析了高频对理想等效电路的影响;确定了基于参数矩阵的插入损耗表达式,并在理想和高频情况下,分别推导出共模、差模滤波器的参数矩阵。根据电网侧负载阻抗和开关电源侧源阻抗的特性,分析了插入损耗与频率的关系;由于高导软磁铁氧体具有旋磁频率极限和非线性磁滞回线,分析了二者对共模电感的抑制作用和共模插入损耗的影响。根据相关标准及抑制效果要求,确定三相EMI滤波器的参数。实验结果表明:插入三相EMI滤波器后,开关电源的噪声峰值得到约21dB的抑制。

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