Description
根据PLC控制系统中电磁干扰干扰模式的不同,可分为共模干扰和差模干扰。共模干扰是信号对地的电位差,在采用隔离性能差的配电器供电时,共模电压会比较大,有的甚至可以高达130V以上。共模电压与差模电压的转换可通过不对称电路,对其测控信号直接产生了影响
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