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Thread: How to decide what smps I need for project hybrid amp.

  1. #41
    .... Silvio's Avatar
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    @ Kees54, Try this Resonant smps design it may help you out. This is only designed for smps up to 700w

    Link https://www.nxp.com/products/power-m...n-tool:LLC-DST

    Regards Silvio

  2. #42
    kees57
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    Quote Originally Posted by Silvio View Post
    @ Kees54, Try this Resonant smps design it may help you out. This is only designed for smps up to 700w

    Link https://www.nxp.com/products/power-m...n-tool:LLC-DST

    Regards Silvio
    Thanks for link, however I have already xls sheets for calculating the resoant, I have however no calculator for multiply voltages like 12, 320, 120 + 120 volts.

    I go just follow the simulation and use the simulated inductions. Calculate the needed copper wires and scin effect, this can be help. Now I need a supplyer
    for the transformers because what I have now is from pc supply's but with unkwown specs, I have wind 10 windings and measure it getting 125 uH so this
    way it works also, however when using multtply windings it wil not always be working to get the right induction s.

    The program you linking here is not usable, becasue for resonant and the Q and K we need really the right power and voltage specs. For the resoant I have here there is
    no need for a pfc, it is just max 250 a 300 watts.

    regards
    Last edited by kees54; 11-19-2019 at 12:19 PM.

  3. #43
    diysmps Senior Member res_smps's Avatar
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    Quote Originally Posted by kees54 View Post
    Hi All

    Do somebody now how to calculate the transformer itselfs? I have done this with a excel sheet who is used for a sudden chip I not use But I think it will work
    also because resonance is resonance right? I have imput that in a simulator and it was quite good and close. I see the resulting induction was quite low
    that is a result of how I does make the Q factor of the system with the k.

    Here is a test winded transformer, I did make a slotted bobine for it, measurement did let see a leak of 40 uH on 120uH primairy coil inductance.

    Because I do need more voltages I do not know what happens, I have a old ferrite from a pc supply, I think it is better buy new ones, these are not so expenseive
    anymore. For the resonant coil, do I need a version with the same spec,s? because to prevent things co wrong like saturation.

    I have received now some controllers for the system, one has a direct mosfet drive capabillity without a drive transformer, for bigger power I like a transformer more.

    So I can experiment.

    Attachment 7161

    see pic, Transformer is winded with wire, not the real one because I need to use strains of wire, this is just a test,

    thanks.
    have you checked this?

    Quote Originally Posted by res_smps View Post
    I think you can use the formula in Infineon (international rectifier) application note AN-1160 page 13 and put it in Excel
    The primary turn can be calculated using the formula on page 13,
    Secondary turn can be calculated from the turn ratio obtained on page 9

    if the inductance is too large you can grind the center leg of the ferrite core
    Attached Files Attached Files

  4. #44
    kees57
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    Quote Originally Posted by res_smps View Post
    have you checked this?


    The primary turn can be calculated using the formula on page 13,
    Secondary turn can be calculated from the turn ratio obtained on page 9

    if the inductance is too large you can grind the center leg of the ferrite core
    Thanks for the note, I didm read that, the chip I have also now.

    Mine concern was the multiply voltages I need 300 volts output, and 2 x 120 and 1 x 15 volts 10 amps.

    I have some sheets to calculate also with other chips, it is the resonant frequ and such, what is the same for all.

    I have now make a splitted bobine transformer, I wait now for the inductionmeter who is not yet here and go use that
    for the prper windings becase I do not now the core specs, do 10 windings and measure it, but I did read somewhere that
    this is not correct to use, it is never for example 1 uH per winding make it 10 uH with 100 windings it is not accurate anymore.

    But oke, then I go order some transformer cores, these are not expensive. Like ETD39

    DSCN3901.JPG

    regards[
    Attached Images Attached Images
    Last edited by kees54; 11-26-2019 at 11:10 PM.

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