We use TL431 to make high-power with technology of power source of Wei accept electron adjustable regulated power supply in one article (the following abbreviation " benefit " ) place is with transformer exemple, one pace guides everybody to complete the whole process that this transformer designs.
In this article, we do not go the application related derivation is formulary, just hope the reader designs the result that draw inferences about other cases from one instance achieves in example from this.
1. Computation is sub output power (P2)
" benefit " voltage of the biggest output is 24V in article, hypothesis is rated 1A of output electric current, adjust tubal K790 tubal pressing falls 3V, times press rectification circuit power comsumption to ignor, criterion:
P2=(24 3)x1=27W
2. Computation primary power (P1)
Assume =0.75 of transformer efficiency η , criterion P1=27W/0.75=36W
Note: The efficiency of transformer differs according to outputting the size of power and change somewhat, it is in the transformer η under 100W to the capacity normally between 0.7-0.8, 1000W comes under 100W, between 0.8-0.9, when be being applied actually, output power is low person take small cost.
3. At the beginning of computation, the line means of secondary coil (D)
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In type, I -- winding job electric current, j -- current density (normally J takes 3-3.5A/mm2)
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I1=36/220=0.164(A) of primary winding electric current
Means of 3.1 primary winding line
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Means of line of 3.2 sub winding:
I2=1x1.17=1.17A of sub winding electric current
In type 1.17 it is transformer the rectification coefficient of sub alternating current.
