传导性电磁兼容干扰信号自动处理研究

Research on automatic processing of conductive electromagnetic compatibility interference signal

文中在传导性电磁干扰的产生机理和耦合方式的基础上,分析了线性阻抗稳定网络这一干扰测量电路的工作原理,提出了线性阻抗稳定网络输出为共模和差模混合噪声这一问题后,给出了Paul、See和Guo 3种噪声分离网络来实现从总噪声中分离出差模噪声和共模噪声。根据干扰三要素着重介绍了屏蔽、接地和滤波3种重要的干扰抑制措施,最后利用改进的软件算法来对噪声信号进行诊断和处理,结果表明所采用的算法能够更好的去除共模噪声和差模噪声。

Based on the formation mechanism and coupled modes of conductive electromagnetic interference,the paper analyzes the working principle of the linear impedance stable network,which is attached to the interference measurement circuit.Then it puts forward an issue that the output of linear impedance stable network focuses on the common mode noise and differential mode noise,and three networks of noise discrimination,including Paul,See and Guo,are introduced to separate common mode noise and differential mode noise from the total noise.According to the three elements of interference principle,three kinds of important methods of interference suppression are introduced,such as shielding,grounding and filtering.Finally an improved software algorithm is designed to diagnose and process for the noise signal.The results indicate that the adopted algorithm shows a better effect to remove the common mode noise and differential mode noise compared to the original algorithm.