nickskethisniks Senior Member
Joined: 17/10/2017 Location: Belgium Posts: 190 
Posted: 01:00pm 21 Jan 2020 



So you don't see it as a problem the way I wound the inductor?
I know the core will saturate @ those current levels. I used an etd59 for more than a year now, considering the size (cross section) that will saturate @ half the current.
You motivated me to do some more research, so I found a site where I could do some calculation.
This morning I looked back at the bobbin and it "looks" more like 22 turns then 25.
So I found this website to calculate saturation of an inductor.
http://pigeonsnest.co.uk/stuff/coresaturation.html
Datasheet of the core is found here: https://www.ferroxcube.com/upload/media/product/file/Pr_ds/U100_57_25.pdf
It doesn't matter one or 2 core halves for the calculation?
So if I derrive some information: For a certain airgap with one bobbin I could measure 60uH.
AL= L/n² =60uH/22²= 123.97nH/n²
If I use the tool and use the following data as reference:
AL=123.97nH/n² Bsat= 0.32T (datasheet) L = 60µH Ae = 645mm²
Then I get 75A for the saturation current.
If I do this for my ETD59 core I get about 30.6A for 320mT and 38A for 400mT, if I remember right it was somewhere between 30 and 40A. So these look the right numbers.
I could parallel 2 inductors in series to reach my goal. 