Winding ferrite core transformer

I'm doing a DC DC converter, and after doing some calculations my winding using an etd49 transformer has 1 primary turn and 34 secondary turn. 

The current on the primary is around 50 ampere, and the frequency is 50KHz, so i decided to use few strands of 23awg wire to make a litz wire. The problem is if i wind the primary turn, the 90% space of the bobbin is still empty, which i think is not good(correct me if i am wrong). 
want to know, how can I wind this transformer effectively if primary turns are too low? 

Edited by zhihao sun on 8 months before

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User_2626 says:

You need more than a "few strands" AWG23 for a reasonable 50 A winding. In terms of skin depth, AWG 23 strands are already less than optimal. Good stranding is required anyway to share the current uniformly between all wires.

Referring to ETD49 power capacity numbers, 30 to 50% winding area utilization would be expected at least for 500 or 600 VA push-pull transformer.

Published: 8 months ago

User_2626 said:

You need more than a "few strands" AWG23 for a reasonable 50 A winding. In terms of skin depth, AWG 23 strands are already less than optimal. Good stranding is required anyway to share the current uniformly between all wires. Referring to ETD49 power capacity numbers, 30 to 50% winding area utilization would be expected at least for 500 or 600 VA push-pull transformer.

i've changed the number of strands and i have reduced the empty space at the core. I see it reduces losses and i filled part of the empty space

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Published: 8 months ago

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