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变压器出现噪音

2009-02-27 09:28:02| 分类：【电感器件】 | 标签： |举报 |字号大中小订阅

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一款开关电源,发现有这么一个现象,刚上电加载时一切正常,波形也很正常,但是过半个小时以后,发现变压器出现噪音,而且波形也夹杂了振荡波形,并且漏感变大了.问题解决:把变压器次级线圈减少两圈,然后在tl431的调整端在一个334电容的基础上再并上10k电阻和104电容,现在室温下老化了一天没有噪音.

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