How wrap transformer...

MaXiZ

Member
2003-06-29 12:21 pm
Italy
Hi to all..
I'm build some SMPS Push-pull topology. BUt i've the following doubt...
How I should wrap the tranformer?
Case 1)
---------------
SECONDARY2
SECONDARY1
---------------
PRIMARY2
PRIMARY1
---------------
CORE

Case 2)
-----------------
SECONDARY2
-----------------
PRIMARY2
-----------------
SECONDARY1
-----------------
PRIMARY1
-----------------
CORE

What's the correct one?
 
Interleaving is only good for transformers driven by H bridge. If the topology is of the centre tapped primary type, there will be small mismatches between the two primary windings causing gradual shift towards saturation. If the centre tapped primary type is to be used you should wind bifilar, i.e. two runs of wire wound at same time.