220V输入,27V,12V两路输出,加电以后输出电压正常,27,12V,但是不能带负载,一带负载就掉到0V,TL494,一脚是基准2.5V,2脚是电压反馈,16,15是电流检测,现在问题是不能带负载,请大家支招。
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如果是维修,则检查一下494的供电电路。如果是新电源刚加电的,则重点检查是否保护。输出为零时你测量一下你的保护电路是否已动作,也可慢慢增加负载,看看啥时候掉电再来判断找问题。