EMI滤波器和开关电源防护设计
Prevention Design of EMI Filters and Power Converters
摘要 本文介绍了开关电源共模、差模噪声源等效电路及电路模型;EMI滤波器的设计方法以及在实际应用中对源和负载阻抗的要求;EMC诊断的一般方法等。
关键词 电磁干扰滤波器 噪声源等效电路 电磁兼容诊断
Abstract Equivalent circuit has been empirically developed for the CM and DM noise
sources characteristic of power converters, and these models provide useful estimation
for noise level of power converters. The difference of EMI filters and normal filters are
described and these function of insertion loss has been developed for the EMI filters.
Specially analyse the filter insertion loss performance which is very dependent upon
the impedance characteristics of the noise source and load. Finally, provide useful
method of EMC diagnosis.
Keywords EMI filter, noise sources equivalent circuit, EMC diagnosis