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  1. #1
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    How to wind dual output flyback transformer?

    I am doing 230VAC, isolated flyback. (43W)

    It has a 16V rail
    -and a 5.8V rail.

    They are autotransformer wound, and weighted feedback is taken from each rail.

    (70% TO 5.8V rail; 30% to 16V rail)

    In order to get best cross-coupling, should i ............

    wind the whole winding in one layer.?

    or....

    should i wind the first 5.8V windings over one whole layer...........and then wind the remaining turns fully filling the next layer?

    (i.e. the secondary is a split winding, with the 5V8 rail being tapped off)

    •   Alt20th May 2011, 20:46

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  2. #2
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    Re: How to wind dual output flyback transformer?

    its always better if you split the winding to achieve good cross coupling.It also reduces the leakage inductance.


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    •   Alt23rd May 2011, 05:19

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  3. #3
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    Re: How to wind dual output flyback transformer?

    There's a detailed discussion of leak inductance and self capacitances involved with different windings geometries in Snelling, Soft Ferrites, Chapter 11 Properties of Windings. Unfortunately I'm not aware of any presently available text book of similar quality.

    P.S.: Some good stuff can be found in the TI (former Unitrode) Magnetic Design Handbook:
    2001 Magnetics Design Handbook - MAG100A



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