1746-OB32
1746-OB32
1746-OB32
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分析完电路结构并确定信号输出与PE有连接关系后,如何确定是隔离输入与隔离输出之间的走线间距不满足耐压要求导致的打火拉弧现象?此处有两个方法: 其一,通过PCB布局找出图2中两个隔离电源隔离输入与隔离输出之间的走线间距(一般打火拉弧处),寻找最小间距处并将此处断开。如果断开之后发现不存在打火拉弧的现象,基本可以确定是隔离输入与隔离输出之间的走线间距不能满足耐压要求导致的。 其二,可以将隔离电源的输入地与输出地连接在一起变成非隔离,由于都是等电位,即不会出现打火拉弧现象。 通过以上两种方法,均可以确定是否是由于隔离电源输入与输出之间的走线间距问题导致打火拉弧。
三、整改过程: 通过分析确定是隔离电源输入与输出之间走线间距不足,共模浪涌导致两端高压差问题。为此将打火处的走线断开,此处便不会再出现打火。同时如果其他地方有同样的问题,在断开前面的打火处后,则共模路径为转移到下一个间距不够的地方,因此需要将这些隔离间距都断开,并满足共模电压间距要求。
四、总结:
1.分析方法:如确定是上述提到的系统结构导致共模浪涌时,隔离输入与隔离输出隔离间距不够导致打火的现象,可以采取两种方法进行验证:其一,将打火处的间距断开或增长;其二,将隔离变成非隔离,形成等电位。
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