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Hi all,
I add a valley fill circuit (2 nos 47mf caps and 3 nos diodes) in 30w SMPS. it workout > 0.9PF.
But in 230VAC range only it consumes more (>30%) means Very low efficiency. I also tried different mf caps but no use.I donot know the reasion, Please anybody explain the reasion and...
1) Audible noise means, inbetween 20 to 20KHZ frequency ocilated in tr, winding through mosfet or transi ter. (To avoid this change the fr, range)
2) One or more parts are viabrate as per frequency, like a speaker cone, Most chance is transformer core due to pour lamination.(Bound...
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