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Thread: 1000w smps based on LUDO3232

  1. #51
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    Mr silvio
    What is instruction for wire winding etd49 core?
    Please explain fully
    Thanks
    Last edited by behrad; 09-23-2017 at 04:16 PM.

  2. #52
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    1) What is the peak (Maximum) voltage your amplifier can take?
    2) What is your mains input voltage?
    3) What is the core material of your trafo example ferrox cube 3C90, Epcos N27 or 87 etc

    Answer me on the questions above and I will tell you what number of turns and wire gauge you need and also the sequence how to wind it

    Regards Silvio
    Last edited by Silvio; 09-23-2017 at 11:27 PM.

  3. #53
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    mr silvio
    1:maximum voltage is +/-52v for my amplis
    2:input voltage is 230-240v ac
    3:i have edt49 but i dont know its core material
    this is my trafo pics:
    IMAG0031.jpg
    IMAG0032.jpg

  4. #54
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    what is these?and what is these value?
    can i remove these?
    smps2.jpg

  5. #55
    Quote Originally Posted by behrad View Post
    what is these?and what is these value?
    can i remove these?
    smps2.jpg
    Those are snubber components they work as frequency compensation, I believe it was stated in the pdf documentation. I do think the SMPS will work without them.

  6. #56
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    Those are snubbers and they are used to suppress any ringing during switch off of the fets while in operation

  7. #57
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    Transformer winding sequence

    Transformer calculations

    frequency 60Khz B= 1400 guass input voltage 230v AC transformer ETD49
    copper wire 0.5mm

    Primary 22 turns Secondary 7 turns (7.2v per turn)
    Peak output voltage 50.9 volts each rail at 230 volts
    Output capacitance 4000 uf per rail (4 X 1000uf)
    output inductor 1.5 uH per rail ( 5.5 turns enameled copper wire 1.5mm dia on 10mm ferrite rod 30mm long)
    Maximum current at output 12A @ 84volts = 1000W

    Copper wire primary:---5 wires 0.5mm twisted together (2.8 meters long) approx
    copper wire secondary:---8 wires 0.5mm (2 bundles 4wires twisted together ) (3.5mts long) approx
    Margin tape = 5mm on each side for primary and secondary

    Winding sequence

    make 5mm wide margin tape on each side of bobbin (about 2mm high)

    1/2 primary 11 turns ( leave the extra wire on the side to wind the second half with it)
    3 layers of Mylar tape (cover the whole width of the bobbin with tape)

    Make 5mm margin tape on each side of bobbin
    1/2 secondary 7 turns ( start from center tap and leave around 100mm of wire outside bobbin) put 2 bundles of 4 twisted wires side by side and wind together.
    2 layers of mylar tape
    make 5mm margin
    1/2 secondary 7 turns ( same as above)
    3 layers of mylar tape to cover whole width of bobbin
    make 5mm margin tape
    Half Primary Take the rest of the wire of the primary and wind the rest of the 11 turns.
    3 layers of mylar tape

    Auxiliary windings
    calculate at 7volts per turn so for 21volts = 3turns and for 14volts = 2 turns,
    If you want a double winding then put 2 wires 0.5mm together and start from center tap and wind the turns needed then put the ends on each pin.
    3 layers of Mylar tape

    IMPORTANT Please follow the instructions carefully and use suitable tapes suggested for a safe transformer
    You have to put sleeving at the ends of each wire.
    Take a look at the video on youtube and follow the instructions there The video is called winding small transformers for smps (By Silvio) you will take good advice how to wind a good transformer.

    Regards Silvio

    IMG_0780[1].JPGIMG_0781[1].JPGIMG_0783[1].JPG

  8. #58
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    wowwwwwwwwww!!!
    your description is very excellent and clear and perfect
    very very thanks mr silvio

  9. #59
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    @ Behrad

    Please make a small correction to the data above.

    wire for primary is to be 2 bundles 0.5mm X 3 wires (2 bundles of 3 wires each twisted) 6 wires in all

    Margin width is to be 3mm on each side

    This will be better for current handling in the primary winding. Also 3 wires place themselves better when twisted together

    Regards, Silvio

  10. #60
    hi silvio.
    i am using ee55 core.
    input 220v.
    can u tell me how many turns for 150vdc dual supply ?
    what gauge wire?
    in ur video u wound primary twisted, and secondary not twisted. in 57 post u mention primary and secondary twisted. why?

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