单片机电磁干扰噪声抑制及优化方案

摘要

以矿用多功能控制驱动器为例,提出了一种抑制单片机传导电磁干扰噪声的优化方案.该方案根据传导电磁干扰噪声产生机理对设备的传导电磁干扰问题进行诊断与抑制:提取单片机传导电磁干扰噪声的模态,得到该噪声的共模分量和差模分量;同时测定该噪声源的内阻抗,并与相应噪声模态结合,设计出相应的EMI滤波器,用以抑制单片机的传导电磁干扰噪声.实际应用表明,该方案可有效抑制单片机传导电磁干扰总噪声.%Taking mine-used multi-function control driver as an example, the paper proposed an optimization scheme to suppress conducted EMI noise of single-chip microcomputer. The scheme can diagnose and suppress conducted EMI of device according to generating mechanism of conducted EMI noise. It gets common-mode component and differential-mode component through extracting modal of conducted EMI noise of single-chip microcomputer. Meanwhile, it detects internal impedance of noise source to design corresponding EMI filter to suppress conducted EMI noise of the single-chip microcomputer combining with corresponding noise modal. The practical application indicated that the scheme can suppress total conducted EMI noise of single-chip microcomputer effectively.