Page 39 of 40 FirstFirst ... 92937383940 LastLast
Results 381 to 390 of 394

Thread: 1000w smps based on LUDO3232

  1. #381
    .... Silvio's Avatar
    Join Date
    Apr 2015
    Location
    Malta
    Posts
    675
    Blog Entries
    9
    Hello Behrad how are you?

  2. #382
    diysmps Member*
    Join Date
    Feb 2017
    Location
    iran
    Posts
    31
    thanks.im fine
    my hdd destroyed in last year and i lost all of files about electronic circuit
    i made 2*apex sr-150 and 1*subwoofer ampli and s/c protect for ampli and vu meter and sub-filter circuit and etc... but i dont have power supply so i back and decided build this smps for my 2.1 channel ampli project

  3. #383
    diysmps Member*
    Join Date
    Feb 2017
    Location
    iran
    Posts
    31
    mr silvio
    u have 2 transformer winding instruction!
    http://www.diysmps.com/forums/showth...ll=1#post14542
    http://www.diysmps.com/forums/showth...ll=1#post14756
    which one is correct(or better)?
    i need 50-0-50 volt so i think first instruction is better for me

  4. #384
    .... Silvio's Avatar
    Join Date
    Apr 2015
    Location
    Malta
    Posts
    675
    Blog Entries
    9
    Hello Behrad, the instruction for you will be different due to the output voltage needed is 50-0-50

    Winding turns for you are primary 18 turns and secondary 6-0-6 turns. (volts per turn = 8.6v)

    with these turns you will get around 52v peak on the output at around 230vac input.

    Winding instruction for ETD49 N87 core

    The primary and secondary should be made with 2 bundles of 4 wires each twisted together (8 wires total divided in 2 bundles) copper wire diameter is 0.5mm and frequency of operation is 65Khz

    Put heat shrink tubing at the ends of the wire bundles when coming out with the wire from the bobbin.

    1) Wind 9 turns of primary winding (2 bundles together)leave the rest out this should cover one layer leaving 3 mm margin at the ends of the bobbin. leave the rest of the wire out so that you wind the second part of the primary after the secondary.
    2) Put 3 layers of mylar or capton tape to insulate.
    3) Prepare 2 bundles of 4 wires each and wind half the secondary starting from the center tap and finish on the pins of the bobbin at one end.

    Note put the winding in the center of the bobbin and fill the gap on the sides with a piece of tape cut to size to fill the gap between winding and the bobbin cheek so that you have enough to come level with the winding.

    4) wind the second part of the secondary starting also from the center tap as in instruction 3. fill also the sides to get an even surface for the last part of the primary. Put 3 layers of tape to insulate.

    5) Take the remaining wire left from the first half primary and wind the last half of the primary(9turns) and finish at the pins. insulate with 3 layers of tape.

    Lastly you can wind the auxiliary windings as needed and calculate at 8.6v per turn ( example for 15-0-15 volts you need 3 turns bifilar (25v) then regulate with 7815 and 7915 for the preamplifier voltage. for 12 for fan motor supply you need 2 turns (17v) and regulate at 12v.

    I suggest you take a look at this video so that you understand more of what am I saying in the instructions.

    https://www.youtube.com/watch?v=_K3ixhcTYFg&t=5s

    good luck. Silvio

  5. #385

    First Time DIY on SMPS 600W

    Hi Everybody

    First time i have doing my DIY on SMPS. I followed attached schematic. Time of testing PWM board alone it is fine and waves are very good. After connecting to main PCB( Now i am using general purpose board) first time it burnt IR2110 and SG3525. IRFP400 also shut. Second time there is a big explosion and again IR2110,Sg3525 and IRFP400 also shut. I am totally disappointed with this result. Please guide me.

    Thanks & Regards

    Samarendra Das600W SMPS V2.4.pdf

  6. #386
    .... Silvio's Avatar
    Join Date
    Apr 2015
    Location
    Malta
    Posts
    675
    Blog Entries
    9
    Hello mituadas, I am sorry for what happened. The circuit has been built by a lot of diyers and it works. I am sure you have something wired wrong. I also see that you do not use a series lamp with the mains as a current limiter. You must use a 100w lamp so that if something is not right it will save the circuit. I also see that you have a lot of wires running around and it is not good especially from the drive circuit board to the mosfets. Long runs may pick up stray signals and will arrive distorted to the gates of the fets. You must mount the fets and heatsink on the testboard together with the drive circuit. The paths here should be short as possible.

    Please check the following

    1) See that the high side drive is going to the high side fet and not the other way round. See also that the half bridge wiring between the mosfets is correct according to the schematic.

    2) Check the wave forms arriving at the fets by only switching on the auxiliary supply. Some SG3525 bought from China have a deformed wave form when driven more than 12vdc. (put a few series diodes with the aux line to bring down to 12v and check waveforms with an oscilloscope.)

    3) Are you sure the transformer has no shorted turns in the winding. Try a transformer from an old computer smps
    I did not see it in any of the pictures you sent me.

    4) For the time being use smaller value capacitance on the bulk side like 330uf x 200v instead of 1200uf. The energy stored in these capacitors is large and if something is wrong they will still blow your circuit even if you have a current limiter (100w lamp). Use small capacitance (1000uf) on the secondary output until you get smps working.

    5) Did you check the soft start circuit alone? Does it has a 2 second delay before the relay latches?

    6) Did you check the protect circuit alone and see that it works?

    7) Change the dead time resistor from 100 ohms to around 150 ohms for the time being so that you will be sure that the mosfets are not switching on together.

    8) Make sure that the mosfets have good insulation between them and are properly isolated. I do not see any mica insulators under the mosfets.

    9) Put a 4.7K resistor between gate and source of each mosfet to prevent false triggering

    Lastly be careful in what you do mains voltage is deadly if you get electrocuted. You are doing this at your own risk.
    Last edited by Silvio; 04-21-2019 at 07:43 AM.

  7. #387
    Many many thanks to you Mr Silvio. I will follow all the guide lines given by you. My SMPS is in basic stage. I do not have Main PCB also. I am testing this using general purpose PCB board. I have made transformer as per your guide lines from a reputed Transformer manufacturer. I am suspecting your Point no 7 may be the culprit. How to check both signals(HI/LO) at a time? I have tested only LO side wave forms. Today I will prepare new PWM board and let you know.

    Thanks

  8. #388
    One issue I identified that as per schematic SG 14 pin connected to IR 12 and 11 to 10. But my PWM PCB which i made is SG 14 to IR 10 and 11 to 12. Will it make any difference??

  9. #389
    This picture is wave of my PWM board. only SG3525 IR2110 not connected.
    Last edited by mituadas; 04-21-2019 at 03:27 PM.

  10. #390
    .... Silvio's Avatar
    Join Date
    Apr 2015
    Location
    Malta
    Posts
    675
    Blog Entries
    9
    Quote Originally Posted by mituadas View Post
    One issue I identified that as per schematic SG 14 pin connected to IR 12 and 11 to 10. But my PWM PCB which i made is SG 14 to IR 10 and 11 to 12. Will it make any difference??
    It is important that the low side switch on first, this will charge up the bootstrap capacitor. Be careful and check the datasheets of the sg3525 and also of the IR 2110. Low out of SG must go to low in of the IR. Also for the High side Hi out of sg with high in of IR.

    Check the wave form out of the IR 2110 This is what the gates are getting. Hook up a couple of 1K resistors from the output of the IR. one from low out to ground and the other from high out to VS if i remember correctly. You will power up only the auxiliary and not the mains. They should be both working. You can check the wave form there on both channels.

Similar Threads

  1. 1000W mosfet amplifers
    By MicrosiM in forum Mosfets
    Replies: 7
    Last Post: 09-23-2015, 11:22 AM
  2. Replies: 8
    Last Post: 11-17-2014, 01:53 PM
  3. IRS2092 2x500W/1000W BTL
    By b_force in forum Class D
    Replies: 11
    Last Post: 05-13-2013, 04:54 AM
  4. PiC based flyback SMPS
    By nigelwright in forum diysmps
    Replies: 0
    Last Post: 10-29-2012, 02:03 PM
  5. Quasar 1000w smps
    By tvicol in forum diysmps
    Replies: 21
    Last Post: 02-17-2011, 03:08 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •