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Thread: 1000w smps based on LUDO3232

  1. #21
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    hi silvio , good work . congratulations man, nice build.

  2. #22
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    1000 watt SMPS based on LUDO 3232

    Hi Villenjak,, I am posting the data you need for winding the transformer. I guess you have to alter the tracks for the pcb regarding the aux outputs as for the 5volts you need 5amps of output current and output diodes have to be changed with something more powerful. however I selected a double winding so that you need to put a common anode dual diode (with 3 legs) you can find these in old ATX psu. For the 12volts you can use 1 diode 1/2 wave rectification and smoothing cap for fan and soft start relay
    You need to change also the main output diodes for something more powerful ex 20 amp ( mine are rated at 8amp so I put them in parallel.
    I am posting again the pdf as I had some mistakes in pcb which i corrected

    1) if the supply intended for SSB only or you need for FM as well. ( SSB you need only 50% duty cycle) current density of wire selected for SSB ok
    2)In case you need it for FM what is the power rating of the amplifier for FM. (Fm 100% duty cycle) You can use it for FM but do not take long speeches ok
    3) SMPS tends to be noisy at radio frequency and good filtering is needed


    1000w smps Silvio.pdf IMG_0437[1].jpg
    Last edited by Silvio; 01-11-2017 at 11:03 PM. Reason: pic too small to see

  3. #23
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    Thanks Man it took me a lot of time and thinking but I succeeded. The heatsink is a bit of overkill I guess and till 700 watts of power the fan is not needed

  4. #24
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    Hi Villenjak there is a small mistake in the wire gauge of the 12volt winding this had to be 0.6mm like the other only use 1 wire to wind your turns needed.

  5. #25
    Hi Silvio,
    I apologize for my response, I got sick and I'll get back to you soon. Thank you so much already me much help.
    Greeting

    P.S.
    I use only SSB

  6. #26
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    Hi Silvio, I am sorry to say this at this very late stage but I only just noticed this thread, I am afraid I don't think your PCB meets the creepage and clearance requirements of CE, In fact as far as I can see the primary and secondary circuits are only separated by normal track gaps and if so this is presents a shock and potential fire hazard. Please correct me if I am wrong ?
    Otherwise a beautiful job, I like your thermal solution and of course your Litz wire

    Regards

    John

  7. #27
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    Hi John, I knew that from the start and I tried to be generous in the space between tracks regarding high voltage. The reason for all this was that I did not want a wide pcb keeping in mind that the heat sink if it had to be attached in the conventional way also occupy space. I wanted the pcb to be longish rather than wide. I have in mind to put the amp pcbs on each side of the power supply. The CPU heat sink gives the best compact design with the needed surface area thus this being small in the bottom surface area. This in turn brings the switching fets and the diodes close to each other. I also wanted the breeze from the heat sink fan to blow at the trafo at the same time. I had to compromise somewhere. The Pcb is generously lacquered not to let any humidity and dirt stick to it. The design also caters for a different PWM driver if comes the need of changes as this is detectable.

    PS Thanks for your help and your patience with me. I will not post long posts just not let you time out

    Regards,

    Silvio
    Last edited by Silvio; 01-27-2017 at 01:44 PM.

  8. #28
    Hi Silvio,

    VERY NICE WORK! CONGRATULATIONS!

    How do you wind the two output inductors L2 & L3? I am wondering can these share a single toroid like a common mode choke.

    I am planning my first half bridge smps. And I bought both IR2153 and KA3525, but cannot decide which is better in terms of stability and scalability. I opt for a 800w +/-58v 120khz as a start. As it is for hifi uses, low EMI and ripples are highly desired. I cannot decide whether it should have a output inductor.

  9. #29
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    Quote Originally Posted by jazzclassics View Post
    Hi Silvio,

    VERY NICE WORK! CONGRATULATIONS!

    How do you wind the two output inductors L2 & L3? I am wondering can these share a single toroid like a common mode choke.

    I am planning my first half bridge smps. And I bought both IR2153 and KA3525, but cannot decide which is better in terms of stability and scalability. I opt for a 800w +/-58v 120khz as a start. As it is for hifi uses, low EMI and ripples are highly desired. I cannot decide whether it should have a output inductor.
    Hello JazzClassics,

    Regarding the output inductors I included them not to let the trafo struggle at high load but these tend to drop the output voltage. I made my output inductors from a piece of ferrite rod of around 10mm dia. the final arrangement was with 5 turns of 1.5mm ECW. Without them the smps will trip on overload on start up due to it seeing a dead short when charging the secondary caps being 8000 Uf in all. My smps has no feedback and thus not regulated. I suggest you keep below 100 Khz as switching losses will be quite considerable. Mine works at 60 Khz. Regarding the peak output voltage you will expect the voltage to drop around 15 to 19% at full load 1100 watts. Keep in mind that audio does not draw full power continuously and usually it varies between 30 and 60%.

    I made another smps which uses an IR2153 and a couple of irf740 this peaked at 730 watts. Its peaked design voltage was 45-0-45. It uses an ETD39. if you want to take a look maybe this will suit your need. There is also a video of winding the trafo the proper way. There is a lot of information in it.

    Link http://www.diysmps.com/forums/showth...4144#post14144.

    Regards

    Silvio

  10. #30
    Hi Silvio,

    thank you very much for your reply. Your posts makes me think that this topology and schematic is absolutely doable. I will make my own half bridge smps soon. I may have questions and will come back to you.

    ps. I cannot see your video cos youtube is blocked from my contry.

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