Core Size

[smazhar]

helo
i want to build a smps supply 24v dc to 320v dc 3000va.
i am new in smps and don't know about core size. how can i calculate core size and turn ratio. i already have some cores but with out iduntification.
many thanks

 

[MicrosiM]

helo
i want to build a smps supply 24v dc to 320v dc 3000va.
i am new in smps and don't know about core size. how can i calculate core size and turn ratio. i already have some cores but with out iduntification.
many thanks

What cores do you have?

What topology you are planing to use?