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    SMPS Transformer winding bifiliar or center tap

    Hi guys

    A newbie question

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    need to wire this transformer, both primaries and both secondaries respectfully have the same number of windings, can I wind them bifiliar (simultaneously) or single wire with a center tap.

    Thank you in advance for your quick reply -

    Theunis

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    Re: SMPS Transformer winding bifiliar or center tap

    smps transformer are winded in different method



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    Re: SMPS Transformer winding bifiliar or center tap

    Hi pradeep.g.belchada

    Can you please give me more details, on how the windings are done, (I did say I am newbie)

    Thank you

    Theunis



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    Re: SMPS Transformer winding bifiliar or center tap

    primary 4t> insulate 3layertape> secondary 30t> insulate 3layer tape> primary 4t> insulate3l tape> secondary 4t> insulate 3l tape


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    Re: SMPS Transformer winding bifiliar or center tap

    Hi pradeep.g.belchada

    Thank you for the prompt feedback, I get the picture so you layer the different layers and insulate each layer properly, so there is no centre tapping, each winding/layer on its own,

    Click image for larger version. 

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    I have added the turns into the above image that I calculated is necessary to achieve, the flowing
    Vin (Nom) =11v
    f= 50kHz
    Vout= ±580v
    EDT39 former

    I would appreciate if you are willing to suggests how I wind the layers for this transformer,

    thank you

    Theunis



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    Re: SMPS Transformer winding bifiliar or center tap

    what i said is wind primary half then secondary half then primary full & finally secondary full join the wire for center tapping



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    Re: SMPS Transformer winding bifiliar or center tap

    Hi pradeep.g.belchada

    Ok thanks I get that thank you very much.

    the pri-winding do you wind them close to each other (side by side) or do you space then over the core/former width?

    Does the number of turns look OK for me to achieve ±580v at the secondary.?

    Theunis



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    Re: SMPS Transformer winding bifiliar or center tap

    the turns are winded on former width. it can be winded close to each other.
    what is the dc voltage on your primary side
    give me core size frequency of switching, o/p current required , wire gauge
    Last edited by pradeep.g.belchada; 20th September 2013 at 14:52.



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    Re: SMPS Transformer winding bifiliar or center tap

    Hi pradeep.g.belchada

    Thank you for taking time to help me, I don't have all the information but I can give you what I have,

    Input voltage is 12v dc,

    I am not sure of the core size as I don't know the size of wire to use or the output currant required.

    I have 1mm, 0.5mm, 0.36mm and 0.25 mm wire that I can use.

    Maybe you can suggest were to start, I need ±525v (not critical) on the secondary output, to charge a capacitor of 2uF or 4uF, the capacitor will be discharged max at 300 Hz,

    I have 2 cores/formers that I can use, ETD39 and ETD29,

    The switching frequency will be ±47 Khz,

    I am building Tahmid's SG3525 circuit to drive this and is almost finish with the PC board design.

    http://tahmidmc.blogspot.com/2013/01...planation.html

    ( I hope he does not mind me putting this link here)

    Thank you very mutch for your advice.

    Theunis



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    Re: SMPS Transformer winding bifiliar or center tap

    Hi guys

    have wound the transformer as per pradeep.g.belchada recommendation, the sloppiness is my ten thumbs ( nothing to do with pradeep.g.belchada recommendation ) as this is my 3 rd try at it.

    now I can test and see were I am with this.

    Click image for larger version. 

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    2 Primaries = 3 turns each of (3 x .5 mm litz)

    2 secondaries = 125 turns each of (2 x .35 mm litz)

    Theunis
    Last edited by Theunis Prinsloo; 21st September 2013 at 20:20. Reason: wrong wire size corrected



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