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Thread: 1000w smps based on LUDO3232

  1. #441
    .... Silvio's Avatar
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    Can you show the feedback arrangement that you are using? IF you are using feedback for output voltage regulation than you must have an output inductor around 20uH otherwise it will not work. You must also have a minimum load attached at least 5 or 10w.

    If you have a peak voltage of 80-0-80 then your regulated voltage must be around 60-0-60. You need headroom for the smps to compensate for the voltage drop during load.
    Last edited by Silvio; 09-08-2019 at 11:02 PM.

  2. #442
    Thanks Silvio for your advise. It works for me. My Feedback connection was before the Inductor. I rectified it and now it is working.

  3. #443
    silvio sir,
    i want to make your version of 1kw SMPS for my 2x b215 project and i want to ask if this 12v psu can be suitable as aux. on your design,
    i planned to use AWG#30 for primary and AWG#28 for secondary, please see attached
    thank youSMPS pre-amp type.jpg

  4. #444
    pls tell me which version will you recommend too...

    regards

  5. #445
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    Quote Originally Posted by rinchz View Post
    silvio sir,
    i want to make your version of 1kw SMPS for my 2x b215 project and i want to ask if this 12v psu can be suitable as aux. on your design,
    i planned to use AWG#30 for primary and AWG#28 for secondary, please see attached
    thank youSMPS pre-amp type.jpg
    Hi I must tell you that I adopted a small smps as an auxiliary which was using the top221 chip. This psu was fed strait from the bus voltage (320v)so no input filter and rectification and smoothing was needed at the input. This small psu I found on an AC PCB.

    However the schematic you showed could also work. and you have written down on the schematic how to calculate the output voltage. By that you can add a few turns to the secondary and get to the needed 15v. You can put a 7815 instead to regulate the output voltage for the auxiliary supply. You can make the pcb for it so that it fits on my smps.

    As far as the wire gauge is concerned I think that AWG34 (0.16mm) will be more suitable for the primary winding of the auxiliary as the trafo EE16 is a small core and AWG30 may not fit in the bobbin. As far as the secondary winding well I guess that AWG26 (0.4mm) is more suitable. This all depend how it will fit in the bobbin of the EE16. You can always try with the gauges of wire you have available and see how things will fit for you.

    Lastly the auxiliary psu must be capable of delivering at least 8watts. That is 15v @ 500mA more or less. You need a good drive current for the mosfets.

    If you want to try another type of auxiliary smps I posted one here on this website. It has all the needed information in it.

    Link https://www.diysmps.com/forums/showt...xiliary+supply.

    This small aux will not fit on my 1000w smps version and alteration to the traces of the pcb has to be done to suit the new aux psu

    Main PCB smps. This I built with what I had in hand and it could be that you may not find the parts exactly. However regarding the heatsink being from an old computer cpu makes it a very efficient one. This smps is intended for an audio amplifier and it is not regulated at the output. I even omitted the output inductors finally and got better performance. Please tell me what Peak output voltage you will be needing so that I can give you the winding data according to the transformer core used,

    Regards, Silvio

  6. #446
    [QUOTE=Silvio;[/QUOTE]

    hi sir thank you for the reply i did not noticed it immediately until i visited this site, coz it did not reflect to my email. my setting might be changed.
    once again thank you for your reply on the aux supply, i will try both. i just did not had a work on my hobby due to some high intensity earthquake in my area and my kid was in a little trauma in which i worked out for 2weeks now but still aftershock will be felt any moment since that big one so my family first.
    this project using irs20957 from B215D can be supplied safely 75vDC upto 90vDC for IRFB4227. i have ETD49 N97 at hand and F12c20 diodes from ATX.

    regards
    rinchz

  7. #447
    .... Silvio's Avatar
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    Hello rinchz, I am assuming you are using IRFP460 for switching the half bridge and the calculation is for 80-0-80 peak at 240v input.
    With the mosfets mentioned you will get a peak power of 1200w. Do not force them more then this as they might blow. At this power they will be seeing around 12 or 13 amps of current.

    The winding data is as follows

    For primary you need 18 turns (9+9) for a switching frequency of 60 to 68Khz (leave 3 to 4mm margin at the bobbin cheeks)

    copper wire 0.5mm. You need 2 bundle of 4 wires twisted together (8wires)

    For secondary it is the same as the primary 9+9 turns and with 2 bundle of 4 wires twisted together (8 wires)make center tap at 9 turns.

    Volts per turn = 155v / 18 = 8.6v. This will let you calculate for your auxiliary voltages.

    Wind half primary of 9 turns then secondary 9+9 turns center tap then wind remaining half primary 9 turns.

    Other auxiliary windings you can make last for fan and preamp.

    You can take a look at the video link so that you learn some good practice how to wind transformers for smps

    link https://www.youtube.com/watch?v=_K3ixhcTYFg
    You can adjust the settings on youtube to make the subtitles in your language.

    Regards,

    Silvio
    Last edited by Silvio; 10-27-2019 at 02:25 AM.

  8. #448
    [QUOTE=Silvio[/QUOTE]

    Noted sir, you are right, for a kilowatt i will use 2xIRFP460, igbt's are twice the price however for bigger projects i will use those. i am waiting for some parts to arrive so i can start.
    thank you, God Bless...

    regardz
    rinchz.

  9. #449
    i would like also to ask about the fix value of resistors instead of VR for frequency setting,
    thank you...

  10. #450
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    Quote Originally Posted by rinchz View Post
    i would like also to ask about the fix value of resistors instead of VR for frequency setting,
    thank you...
    RT resistor for timing should be in the region between 8k and 12k However it also depend on the exact value of the timing capacitor. The frequency may vary a little. You can solder a variable resistor to set the timing then put a fixed resistor instead according to the value found.

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