开关管用13003,
计算得到
I1p=0.394a
Lp=4.47mh
变压器Np=203,Ns=20,Nb=5.
通电几秒炸开关管,调整过变压器参数,
最好的时候轻载正常,满载时输出电压跌落到6v.然后调反馈电阻使输出电压升到12v,数秒后又炸!!
请大侠指点指点,不胜感激!!
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