输入电压115V400HZ 三次谐波6.8% THDA7.5% 如何降低三次谐波
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Hi
确认EMI电路,将MOS DS电压传上来看一下。
现在是三次谐波降下来了,但是15,17,19此谐波上去了,总THDA是6.16%
HI
其实相关的原因很多,EMI电路。变压器设计,layout等,甚至环路都有影响。
Hi
只能逐个排除变压器设计,layout等,甚至环路