数字PCB传导干扰信号的虚拟仪器测量

Virtual Instrument Measuring of Conduction Interference Signal in Digital PCB

基于短时分形维数的模糊控制滤波方法,对数字印制电路板(PCB)电磁干扰(EMI)信号中的噪声进行滤波。该方法提出了网络分形维数和短时分形维数的新算法,并讨论了模糊控制滤波方法中的模糊控制参数的选取算法。基于虚拟仪器(VI)LabVIEW6.i平台上对数字印制电路板传导干扰信号进行实时检测。经过信号处理,该系统还具有信噪分离、测量传导干扰信号的功率谱等功能。结果表明,该方法滤波效果良好。

Based on the method of short time divided form numbers fuzzy control filter, to noise in electromagnetic interference （EMI） signal in digital PCB is calculated. That method bring upped new algorithm of network divided form numbers and short time divided form numbers, and fuzzy control parameter is discussed. In virtual instrument（VI） LabVIEW 6.i software workbench, combined with virtual instrument processing,which realizes real-time detection system of the conduction interference signal in digital PCB. By signal processing ,the system has measurement functions as follow：signal-noise to be separated,the measured the power spectrum of conduction interference signal ,etc. Result shows that the method is feasible and effective.