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HF Trafo Core Selection
HF Trafo Core Selection
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Old 21st March 2010, 04:28 PM   #1
kall is offline kall  Sweden
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Default HF Trafo Core Selection

i really hope u guys and girls have a solution to my problem....i hope its okey.

i want to build a transformer but i cant find a suitable core for my calculated values....

here is some data:
n: 20/1
P: 2.5kW
f: 100kHz
I1rms ~ 7A
I2rms: ~ 115A

the thing is, i want to use a UU, UI core, and with U93 from ferroxcube i get a flux at 10mT .... im basically not using the core at all

if i go down in size, the windings wont fit because i need atleast n1 to be 40 turns due to the large turnsratio of 20 to 1 ....

am i thinking wrong??, i think u experienced builders have a solution to this....
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Old 21st March 2010, 11:31 PM   #2
Sch3mat1c is offline Sch3mat1c  United States
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Who cares about current, what's voltage? Flux is Wb == V.s, nothing to do with amps.

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Old 22nd March 2010, 04:20 AM   #3
sawreyrw is offline sawreyrw  United States
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Location: Minnesota

The transformer current is important, because that sets the wire size. Yes, the number of turns depends on the applied volt seconds.


I can't remember the exact formula for the number of turns, but it is given by E=N*d(B*Ac)/dt or N=E/(d(B*A)/dt).

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Old 22nd March 2010, 05:58 AM   #4
kall is offline kall  Sweden
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well, N1 = (Vd*D*Ts )/(Ae*B)

Vd = 400V
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