Page 36 of 36 FirstFirst ... 626343536
Results 351 to 353 of 353

Thread: 1000w smps based on LUDO3232

  1. #351
    .... Silvio's Avatar
    Join Date
    Apr 2015
    Location
    Malta
    Posts
    574
    Blog Entries
    9
    Hi Upik, Please tell me what
    1) IGBTs or Mosfets are you using?
    2) Fast output diodes?
    I need the part numbers to check out your calculations
    3) why are you using such high frequency? getting down a bit say at 65Khz you can do with thicker wire like 0.5 mm this will bring less number of strands for the same current. However IGBTs carry less than the rated current at higher frequencies. Check this out on the data sheets
    4) Do you really need 6Kw of power?
    5) Have you considered that the traces need to carry a lot of current and the copper clad must be at least a 4 ounce and traces have to rather wide.
    6) I think you are going to use a PFC or some kind of boost converter in the input. Have you tried this part alone at 6Kw load? Around 25A at 230v ac.
    7) Input capacitance need to be adequate as the output will suffer a lot of ripple
    8) Usually such high current smps are divided in two power supplies rather than a large one. It will make life easier and they will perform better.

    Regards Silvio
    Last edited by Silvio; 10-26-2018 at 09:09 PM.

  2. #352
    diysmps Senior Member
    Join Date
    Mar 2018
    Posts
    118
    Quote Originally Posted by Silvio View Post
    Hi Upik, Please tell me what
    1) IGBTs or Mosfets are you using?
    2) Fast output diodes?
    I need the part numbers to check out your calculations
    3) why are you using such high frequency? getting down a bit say at 65Khz you can do with thicker wire like 0.5 mm this will bring less number of strands for the same current. However IGBTs carry less than the rated current at higher frequencies. Check this out on the data sheets
    4) Do you really need 6Kw of power?
    5) Have you considered that the traces need to carry a lot of current and the copper clad must be at least a 4 ounce and traces have to rather wide.
    6) I think you are going to use a PFC or some kind of boost converter in the input. Have you tried this part alone at 6Kw load? Around 25A at 230v ac.
    7) Input capacitance need to be adequate as the output will suffer a lot of ripple
    8) Usually such high current smps are divided in two power supplies rather than a large one. It will make life easier and they will perform better.

    Regards Silvio
    1. I use mosfet 47n60 ,, 2. in rurg 5060, 3, I only follow the components on the pcb, 4. at least 5kw, I use pfc ..

  3. #353
    .... Silvio's Avatar
    Join Date
    Apr 2015
    Location
    Malta
    Posts
    574
    Blog Entries
    9
    Quote Originally Posted by Upik View Post
    1. I use mosfet 47n60 ,, 2. in rurg 5060, 3, I only follow the components on the pcb, 4. at least 5kw, I use pfc ..
    1) You must include RDS on for 47n60 in the software 0.07 Ohms (from datasheet) and not U sat in this case

    2) Diode forward voltage drop for RURG5060 according to datasheet at 30 amps is around 1v

    3) if you still want to use 85Khz then correct the copper wire thickness from 0.5 to 0.4mm for the primary as it is too thick for this frequency

    Plug the values and see what you get.
    When you press calculate then move the mouse on the output voltage result and it will be displayed the peak output voltage. If your smps is not regulated this is what you will get in the output as the result shown will give you the result at load with an output inductor included.
    You will get 3 results according to the input voltage (min, Mean and max)

    Some hints

    Make a bundle of wire with the required number of strands and see how they fit in the transformer try to cover one whole layer. you need to sandwich your secondary between the primary for good coupling. try to avoid partial coverage of the bobbin with each winding as this will bring a lot of leakage inductance and asymmetry. You can lessen some strands if this is the case so that you will have a good fit. You can use 2 or more bundles instead of a single bundle for each winding ( Ex. 2 bundles of 20 wires each will bring 40 strands or 3 bundles of 13 each will bring 39 strands etc)
    Use adequate tape (Mylar) to avoid any danger of primary leaking with secondary. 3 layers between pri and sec. 1 layer tape between layers of the same winding. Try to leave some margin space with the windings at the cheeks of the bobbin. 2-3mm on each end.

    Good luck Silvio

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
  •