Hi,

I want to design transformer to step down from 120 V @ 60 Hz on primary to 15 V and max 1 A of current on secondary . To make winding easy for me I am going with EI core.
I hope to utilize Kgfe (core geometrical constant) method how to determine core size but even if I had spent countless hours looking into datasheets of different manufacturers (I don't want to break any anti-advertisement rule here, but one of them is mentioned in linked pdf about Kgfe method in the beginning of example #1. ), I wasn't able to convert provided specs into Kfe (core loss coefficient) and Beta coefficient.
Given that core loss Pfe = Kfe*(dB^{Beta})*Ac*lm
Can you point me out as how to use this method with data which are actually available?

Thanks.

 

I don't know much about transformer design, but maybe this will be useful.

http://www.giangrandi.ch/electronics/trafo/trafo.shtml

 

Can you point me out as how to use this method with data which are actually available?

Thanks.

It has been my experience so far that there is virtually no definitive transformer design criteria out there.
Max.

 

Have you seen these? http://ludens.cl/Electron/trafos/trafos.html http://ludens.cl/Electron/Magnet.html
http://ludens.cl/Electron/Magnet.html

 

Thats a 8:1 turns ratio, just select the size of wire that will give you the secondary current.

 

I don't know much about transformer design, but maybe this will be useful.

http://www.giangrandi.ch/electronics/trafo/trafo.shtml

Thanks,
although it doesn't seem to be related to Kgfe method. I will go through it and post back if I am able to put it in any relation with the theory I am already familiar to.
M

I don't know much about transformer design, but maybe this will be useful.

http://www.giangrandi.ch/electronics/trafo/trafo.shtml

I'll check - thanks.

 

Thats a 8:1 turns ratio, just select the size of wire that will give you the secondary current.

Thanks, but I wanted to compute size of the core with that particular method which I've mentioned. I don't have troubles with turn ratio.

 

Have you seen these? http://ludens.cl/Electron/trafos/trafos.html
http://ludens.cl/Electron/Magnet.html

Yes, I have already been on that site.