断开交流输入开关电源死机无输出,机房设备全部掉电,是什么原因!

2025-03-16 06:50:41
推荐回答(1个)
回答1:

  这是交流接触器动作产生电弧高压脉冲反馈到开关电源所致。

  一、工作过程。开关电源输出5伏电源供给单片机工作,单片机根据设定程序输出信号触发晶体管导通,集电极回路继电器闭合,接点接通220伏交流电源至交流接触器线圈,交流接触器动作,三组常开触片闭合。
  二、故障现象。当接通交流接触器时并无影响,断开交流接触器时才造成单片机死机,自动复位,可见故障是在断开瞬间发生的。
  三、可能原因。交流接触器的线圈,电感量较大。电感的特性是:总是反对线圈中电流的变化。接通瞬间,线圈中电流为零,电感反对电流增加对单片机没有影响。而断开时,线圈中电流从有电流到无电流的变化,电感反对这种变化,将存储的磁能转化为电能追加在电路上,造成交流接触器触点因极高电压而产生电弧,这一高压脉冲沿着电源线送到了开关电源的输入端,开关电源检测到这个脉冲,认为电网电压升高了,立即缩小空占比,试图降低输出电压而维持电压稳定。过度的缩小造成单片机5伏电压短暂中断,相当于断电。所以死机,复位。
  四、解决办法:
  1、在开关电源输入端增加一个压敏电阻,电压值选择300伏左右,超过300伏的高压脉冲被削去。
  2、重新计算5伏电源输出滤波电解电容的容量,在计算值基础上增加约10%。
  3、检查驱动晶体管集电极回路并接在继电器线圈的二极管、小电容性能。
  4、在继电器控制交流接触器的两接触片上并接一个0.1微法,耐压630伏的无极性电容灭弧。
  至此,故障应当排除。

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