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Proteus 7 - Transformer

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gogetax1

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hey guys, im working on a new circuit of power supply, now, im not rly sure how to setup the transformer right~

what to type in primery inductance, Secondary Inductance, and so on..

i need, 220V to 12V drop.
 

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Primary inductance must be big enough to keep shunt current (or ripple in a switcher) down to a tolerable level, but low enough to prevent an oversized part physically. Tight coupling is especially important in a switcher, but makes achieving high voltage isolation more difficult. Winding resistance is a matter of IsquaredR loss vs. physical size of the finished transformer!
 
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