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Type: Posts; User: Silvio

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    Sticky: You're Wellcome :)

    You're Wellcome :)
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    Yes i can also see that the pulses are not...

    Yes i can also see that the pulses are not symmetrical.
    This could be the highside i guess. Try to change the capacitor feeding the gate to correct. Try a different value and see for any changes....
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    Sticky: I have seen a circuit that uses a 100uF capacitor...

    I have seen a circuit that uses a 100uF capacitor with a 150K parallel resistor to it. I don't know how this works or does it really stretch the soft start timing. It will be worth a try. On the...
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    Hi FIFI, good to hear that you are making...

    Hi FIFI, good to hear that you are making progress. Regarding voltage drop it is inevitable especially this is due to some more factors that have to be considered.

    1 Voltage drop at the input...
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    Sticky: Ok give me some time I post a video. Do you have...

    Ok give me some time I post a video. Do you have whatsup I can post it there. Though the video is short is still to big to mail it.
    You can send me your number by mail and I post on whatsup.
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    Sticky: Here is a pic the size is small on purpose it is...

    Here is a pic the size is small on purpose it is 113kB png file

    I am trying to use the insert image icon on the top menu bar but to no avail. The problem is still there.

    I sent you the pic via...
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    Sticky: I am using google Chrome ever since as a browser...

    I am using google Chrome ever since as a browser and the same problem persists. When you hit the upload button simply there is nothing uploaded.
    My internet connection is with 5G and at 100Mb/sec...
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    Sticky: Regarding the bridge you made from pin 2 to pin 8...

    Regarding the bridge you made from pin 2 to pin 8 on the 555 timer is not the issue, You probably have a ground loop on the protect board. Try to ground the pcb at two points. Pin 2 should be...
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    Simple when you try to upload a pic or file it...

    Simple when you try to upload a pic or file it simply would not upload. I tried one earlier today it was a jpg file (pic)of 700Kb
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    Hi FIFI please note that the voltage at the half...

    Hi FIFI please note that the voltage at the half bridge is 155v and not 320. The current has to be calculated at 155v so for 250w out (taking into account that the smps is 80% efficient) so 250 /...
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    Hi FIFI, so now you know that its not that simple...

    Hi FIFI, so now you know that its not that simple to make a variable regulated power supply as these issues will crop up at times. Please note that due to different operating frequency the number of...
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    Sticky: 1) Well for the better temperature control by...

    1) Well for the better temperature control by shortening and thickening the wire is a good result at 53 degrees Celsius.

    2) The efficiency is a bit not real to my believe. One of your meters is...
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    Are you convinced now that I have been having...

    Are you convinced now that I have been having problems uploading? :)
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    Hi Steven, regarding the rise in output voltage...

    Hi Steven, regarding the rise in output voltage could be due to the pfc section. If I understand correctly you have a pfc stage in your smps. Please remember that smps especially when they have...
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    Sticky: Hi Marcel, your work looks nice and the control...

    Hi Marcel, your work looks nice and the control board looks cool also. Regarding forced cooling I suggest that it would be temperature sensed so that it gains revs as heat is increased. This will...
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    Sticky: Hi Marcel, regarding the transformer temperature...

    Hi Marcel, regarding the transformer temperature check both the copper and core temperature. If the copper temperature is getting hot it means it is not withstanding the current. Copper wire when...
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    Sticky: Hi Marcel, I am glad you got good results, all I...

    Hi Marcel, I am glad you got good results, all I said to you is with past experience and my own discoveries :)
    I also had problems posting pictures lately on this site
    A few tips for you.
    download...
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    Sticky: From what I can see that you got 81% efficiency...

    From what I can see that you got 81% efficiency with the figures you gave. It is quite normal to have that kind of efficiency. if you want to increase the efficiency then you have to go for a...
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    Sticky: As far as the input winding turns then I agree...

    As far as the input winding turns then I agree with you. In my version I had epcos N87 core and my primary turns where 18. I guess PC40 material may even be a turn less. I tested at 1200w and...
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    Sticky: To see what are you really drawing from the smps...

    To see what are you really drawing from the smps you have to use an ampere meter and a voltmeter at the output. You will measure the power from them by multiplying the voltage by the current.
    ...
  21. The constant 4 is used for square wave while the...

    The constant 4 is used for square wave while the constant 4.44 is used for sine wave. In smps which is hard switched is square wave.
    Regards Silvio
  22. I just re-worked the sum and in fact is 50turns ...

    I just re-worked the sum and in fact is 50turns 155x10^8 = 155,000,000,00

    4 x 33,000 x 1.3 x 1800 = 308,880,000

    If you divide the first number by the second using a calculator the sum comes to...
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    One of these things will make the transistors...

    One of these things will make the transistors heat up.
    1) Transistors are not genuine and cannot withstand the load
    2) Dead time too short and one transistor is switching on before the other had...
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    Sticky: CF139 is a little bit better core material than...

    CF139 is a little bit better core material than N87 TDK.

    Your primary winding can be 28 turns instead of 30 turns. (input 230vac)
    Using this formula then 155v/ 28t = 5.53 volts per turn ...
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    Sticky: Primary winding 30 turns. (15T +15T) ECW 4...

    Primary winding 30 turns. (15T +15T) ECW 4 wires 0.5mm twisted together. Leave 4mm margin space at bobbin cheeks on each side.

    Secondary 10 turns. for single winding if you want double...
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