Hello.
I have two toroidal cores scavanged from 50Hz applications:
**broken link removed**
The little one is:
Hight(h) = 30mm.
Outer diameter(Od) = 94mm.
Inner diameter(Id) = 52mm.
Effective length(le) ≈ 222mm
Effective area(Ae) ≈ 630mm²
12turns = 700µH @ 100Hz.
AL = 4861.1
the big one is:
Hight(h) = 38.5mm.
Outer diameter(Od) = 98mm.
Inner diameter(Id) = 60mm.
Effective length(le) ≈ 243mm
Effective area(Ae) ≈ 731mm²
10turns = 250µH @ 100Hz.
AL = 2500
I used:
le ≈ pi(Od - Id) / ln(Od / Id)
Ae ≈ h * (Od - Id) / 2
Though I don't know where to go from here, one problem is the winding configuration.
Reading online I find some people saying that one should use two equal single windings but some say I should use some kind of of center-tap connected to PE-earth?
Is there anyone here that does know how I should wind a isolation transformer, and I am searching but have not jet found any hint on how to figure out the number of turns.
I have seen some design that used 2x 300 turns but I want to know how many turns and why.
I can't really give any absolute power requirement but the main use will be to drive ether a digital oscilloscope or a function generator, I'll look up how much current my equipment require, oh its for 230Vrms.
Any thoughts are very welcome.
Regards