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  1. Replies
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    I think you are referring for the snubber across...

    I think you are referring for the snubber across the primary winding. This is there to suppress any spikes generated during switch off of every cycle. Through my experience When a transformer does...
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    At the current of 20A these effects will surely...

    At the current of 20A these effects will surely come out and that is the reason of the extreme heat. I suggest you wrap 4 wires at a time and make 6 bundles. If you have a copper sheet it will be...
  3. Thread: SMPS with PFC

    by Silvio
    Replies
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    I guess you want to check the schematic for any...

    I guess you want to check the schematic for any errors correct? If that is so please post a larger image of the schematic as it is too small to see it
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    The wire for secondary with 22 wires 0.55mm can...

    The wire for secondary with 22 wires 0.55mm can surely carry the 20 amps needed. I am assuming that the winding get hot during a load of 20 amps. I do not know if you want this smps to work 100%...
  5. This is a two switch converter to my believe it...

    This is a two switch converter to my believe it is very immune to shoot trough. Your problem is very odd. It would be of much help if you could post some oscilloscope shots at least at idle. without...
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    Sticky: To check the dead time you need to take out the...

    To check the dead time you need to take out the cursors and put the waves on top of each other. You will notice that one wave has a shorter pulse width than the other. You need to measure that...
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    Sticky: @ Marshall. The wave forms look good I guess...

    @ Marshall. The wave forms look good I guess these are the low and high side being read together.
  8. @ Kees54, Try this Resonant smps design it may...

    @ Kees54, Try this Resonant smps design it may help you out. This is only designed for smps up to 700w

    Link ...
  9. Have you tried Elektrotanya? Try this link ...

    Have you tried Elektrotanya?

    Try this link ...
  10. [QUOTE=nhatspkt;16244]Can you give me some advice...

    [QUOTE=nhatspkt;16244]Can you give me some advice how to calculate flyback tranformer and select Bmax, D ?[/LinQUOTE]

    Here is some software that you can download and this will calculate...
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    Have you tried a larger output capacitor? For...

    Have you tried a larger output capacitor? For the output you need to put a light load for the output voltage to settle quicker.
  12. From what I am assuming is that not everybody has...

    From what I am assuming is that not everybody has the means of making a gap in a standard non gap core. From what I am thinking is that he is preferring to use a standard gapped core with the...
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    Sticky: Here you have a link and you find all the details...

    Here you have a link and you find all the details you want. If you want a lower voltage other than 12v just change the zener diode to the required voltage.
    ...
  14. So sorry I did not notice you already posted them...

    So sorry I did not notice you already posted them :D :D
  15. Hi Stewin could you post a PDF file so that we...

    Hi Stewin could you post a PDF file so that we have a more clear schematic and pcb layout?

    Thanks and regards Silvio
  16. Replies
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    Sticky: RT resistor for timing should be in the region...

    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...
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    Sticky: Hello rinchz, I am assuming you are using...

    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....
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    Hello xisto, regarding repairs on amplifiers it...

    Hello xisto, regarding repairs on amplifiers it is always a must to put a series 100w lamp at least if you have a short circuit somewhere it will limit the current. At times a fuse is found after...
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    It is best to acquire a schematic diagram. If...

    It is best to acquire a schematic diagram. If the amplifier is from LD systems then you can contact Adam Hall in Germany and ask for a schematic diagram. You will have to sign a declaration that...
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    Sticky: Hi I must tell you that I adopted a small smps as...

    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...
  21. Thread: Car amp smps

    by Silvio
    Replies
    7
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    356

    Usually we regulate at around 0,707 of the peak...

    Usually we regulate at around 0,707 of the peak value. So if you have a peak voltage of say 45v then we multiply that by 0.707 and we get around 32v. This holds true for an off line smps because we...
  22. For protection we usually use a voltage...

    For protection we usually use a voltage comparator sensing the half bridge through a current trafo or an external inductor, then this feeds a 555 timer which eventually operates the shutdown pin on...
  23. Have you start with some hardware? Try to build...

    Have you start with some hardware? Try to build something and then put what you are simulating in practice. You will see if your simulations is correct or not.
  24. Thread: SMPS with PFC

    by Silvio
    Replies
    45
    Views
    9,383

    *for the same power, the higher the output...

    *for the same power, the higher the output voltage the smaller the capacitor needs

    In the pfc circuit to my believe the value of the capacitor determines the hold time at load.

    Check this ( I...
  25. Thread: Car amp smps

    by Silvio
    Replies
    7
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    356

    EI 33 can give you 200-300w 17wires X 0.5mm...

    EI 33 can give you 200-300w

    17wires X 0.5mm get you 3.33mm˛ of copper wire. This can handle 20A or more for audio purpose

    250w / 12v = 20A

    Your switching frequency with 0.5mm wire can go up...
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