FBMSVH

描述

FBMSVH

室外使用的单片机系统或电源线、信号线从室外架空引入室内的，要考虑系统的防雷击问题。常用的防雷击器件有：气体放电管，TVS(Transient Voltage Supervention)等，气体放电管是当电源电压大于某一值时，通常为数十伏或数百伏，气体击穿放电，将电源线上强冲击脉冲导入大地，TVS可以看成两个并联且方向相反的齐纳二极管，当电两端电压高于某一额定值时导通。其特点是可以瞬态通过数百乃至上千安培的电流。这类元器件要和抗共模和抗差模干扰的电感配合使用以提高抗干扰效果。
提高单片机系统抗干扰能力的主要手段接地
这里的接地指接大地，也称作保护地。为单片机系统提供良好的地线，对提高系统的抗干扰能力极为有益。特别是对有防雷击要求的系统，良好的接地至关重要。上面提到的一系列抗干扰元件，意在将雷击、浪涌式干扰以及快脉冲群干扰去除，而去除的方法都是将干扰引入大地，如果系统不接地，或虽有地线但接地电阻过大，则这些元件都不能发挥作用。为单片机供电的电源的地俗称逻辑地，它们和大地的地的关系可以相通、浮空、或接一电阻，要视应用场合而定。不能把地线随便接在暖气管子上。绝对不能把接地线与动力线的火线、零线中的零线混淆。

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主营DCS系统配件
机器人系统配件
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