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Thread: 1kW smps project (based on MicrosiM design)

  1. #1321
    diysmps Member CDJKuznec's Avatar
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    Silvio, wery big thanks for the help to me and time spent for me!

    I don't know material of my transformer now. I think that N87.
    Why you have on the picture a working frequency = 65kHz?
    There can be 75?

    Resistance of rds channel = 0.2 Om for w20nm50.

    My stpr1520D diodes.

  2. #1322
    diysmps Member CDJKuznec's Avatar
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    My smps v2.1 by Ludo

    Silvio, tell me that it isn't correct on my picture for calculation of the transformer?
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    Last edited by CDJKuznec; 07-13-2018 at 08:22 AM.

  3. #1323
    .... Silvio's Avatar
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    Quote Originally Posted by CDJKuznec View Post
    Silvio, wery big thanks for the help to me and time spent for me!

    I don't know material of my transformer now. I think that N87.
    Why you have on the picture a working frequency = 65kHz?
    There can be 75?

    Resistance of rds channel = 0.2 Om for w20nm50.

    My stpr1520D diodes.
    Transformer Material PC40 or N87 are more or less the same.

    Copper wire 0.5mm cannot be operated more than 68Khz due to skin depth. I chose frequency of 65Khz because of that.

    I calculated the transformer for you for 1200 watts, because the switching transistors w20nm50 are only 20 amps. At this power you do not operate transistors with more than 12 amps 60% rated power.

    The input capacitor need to be larger for more power. You will need min 1uf per watt across 320v with the capacitors you have you have a total of 1000uf across 320v (1000uf x 200v X 2 = 2000 in series with 1000uf x200v X 2 = 2000uf for a total of 1000uf X 400v.) For more power you need more capacitance in input.

    regarding RDS ON this will make little difference in power output. The dead time must not be less than 1uS

    My calculation for you for peak voltage because the amplifier will be working with that maximum voltage most of the time and smps is not regulated

    The calculation in Excellent IT software is for output voltage at continuous full load and also with output inductor included. The output voltage will however decrease with full load. In an amplifier the load is not constant and will be between 30% and 60% duty cycle.

    If you want more power from SMPS you have to put more capacitance on input and also change switching transistors with higher amperage like W45NM50FD .then you can get 2.5 or 3Kw, You will need to make more wire strands for more current in winding of transformer.

    Regards Silvio
    Last edited by Silvio; 07-13-2018 at 09:46 AM.

  4. #1324
    diysmps Member CDJKuznec's Avatar
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    Silvio, many thanks for the clear and developed answers for me.
    As there will be free time, i will be continue work on this project.
    Very big thanks!

  5. #1325
    I will to begin this project right now. Thanks a lot for post.

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