multiple layers = high leakage inductance?

Hello,

We are planning to wind a full-bridge transformer for isolated 90-265VAC use.

It has PSP winding:


-First primary section = 3 layers of 19 turns

-Secondary section = 4 layers of 18 turns

-Second primary section = 3 layers of 19 turns

All layers are wound right across the whole bobbin window length.

Due to the multiple layering, will this mean the transformer has higher than normal leakage inductance?

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sebas___ says:

No, interleaved winding schemes will have lower leakage inductance and lower winding capacitance. 

Published: 1 month ago

sebas___ said:

No, interleaved winding schemes will have lower leakage inductance and lower winding capacitance. 
dwerk0x says:

Yes, I appreciate that but what I mean is as the secondary itself is made of multiple layers... Would that affect in a negative way increasing leakage of the transformer? 
 
So, maybe if I had used a bigger core and had done a single secondary layer surrounded by two single primary layers that would have reduced the leakage in compare. 

I'm a little bit confused :$

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Hi dwerk0x,

Even if you have sandwitched secondary in primary, multiple layers will have large leakage due to the poor N X I cancellation. So if you want to reduce the leakage, you can sandwitch your secondary at each layer (p-s-p-s-p-s-p), this will give you the best results and very low leakage. 

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