1756-L72

描述

1756-L72

　在计算机控制系统的现场往往有许多强电设备，它们在起动和生产过程中将产生干扰电磁场，另外还有来自空间传播的电磁波和雷电干扰，以及高压输电线周围交变磁场的影响等。干扰传播途径主要有：电场耦合、磁场耦合、公共阻抗耦合。

电场耦合：又称静电耦合，是通过电容耦合窜入其它线路的。两根导线之间会构成分布电容，印制电路板上各印制电线之间、变压器线匝之间和绕线之间都会构成分布电容。这些分布电容的存在可以为干扰信号提供干扰电抗通道，电场干扰就可以由该通道窜入系统，形成干扰。

磁场耦合：在任何载流导体周围都会产生磁场，当电流变化时会产生交变磁场，该磁场必然会在其周围的闭合回路中产生感应电势引起干扰，它是通过导体间互感耦合进来的。在设备内部，线圈或变压器的漏磁也会引起干扰；在设备外部，平行架设的两根导线也会产生干扰。电磁辐射会造成磁场耦合干扰，如高频电流流过导体时，在该导体周围便产生了向空间传播的电磁波。这些干扰极易通过电源线和长信号线耦合到计算机中。另外，长线干扰具有天线效应，即能够辐射干扰波和接受干扰波。

公共阻抗耦合：是由于电流流过回路间公共阻抗，使得一个回路的电流所产生的电压降影响到另一回路。在计算机控制系统中，普遍存在公共耦合阻抗，例如，电源引线、印刷电路板上的地和公共电源线、汇流排等。这些汇流排都都具有一定的阻抗，对于多回路来讲，就是公共耦合阻抗。当流过较大的数字信号电流时，其作用就像是一根天线，将干扰引入到各回路中。同时，各回流条之间具有电容，数字脉冲可以通过这个电容耦合过来。印制板上的地，实质上就是公共回流线，由于它仍然具有一定的电阻，各电路之间就通过它产生信号耦合。

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