HF Trafo Core Selection
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 21st March 2010, 04:28 PM #1 kall   diyAudio Member   Join Date: Feb 2010 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....
 21st March 2010, 11:31 PM #2 Sch3mat1c   diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI Who cares about current, what's voltage? Flux is Wb == V.s, nothing to do with amps. Tim __________________ Seven Transistor Labs, LLC Projects and Resources / Electronic Design and Consultation
 22nd March 2010, 04:20 AM #3 sawreyrw   diyAudio Member   Join Date: Apr 2006 Location: Minnesota Tim, The transformer current is important, because that sets the wire size. Yes, the number of turns depends on the applied volt seconds. kall, 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). Rick
 22nd March 2010, 05:58 AM #4 kall   diyAudio Member   Join Date: Feb 2010 well, N1 = (Vd*D*Ts )/(Ae*B) Vd = 400V

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