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  1. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    Hi Res, I was taught that Power factor is not...

    Hi Res, I was taught that Power factor is not measured by the watt meter when I was getting my A electrical licence. But still the extra current drawn from an appliance due to bad power factor will...
  2. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    @ Res, Yes it could be that input capacitance...

    @ Res,
    Yes it could be that input capacitance can be smaller and it is also true that there is another high frequency noise source. This chap is building a 4Kw smps. Only one thing is concerning...
  3. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    @ Res, Yes it could be that input capacitance...

    @ Res,
    Yes it could be that input capacitance can be smaller and it is also true that there is another high frequency noise source. This chap is building a 4Kw smps. Only one thing is concerning...
  4. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    @ Rinchz, Regarding the PCB you can design...

    @ Rinchz,

    Regarding the PCB you can design your own if you want and make one in single sided version. Take care of the spacing between traces when it comes to the high voltage ones. 3mm in the...
  5. Replies
    0
    Views
    191

    Best heat transfer insulator

    I encuntered a dilemma what to choose as an insulator behind a power transistor. Is it a silicone pad, a mica pad or a ceramic pad.
    Which of these deliver the best heat transfer to the heat sink? ...
  6. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    Hi Michelle, I forgot to mention something else. ...

    Hi Michelle, I forgot to mention something else. If the smps is to be a 2Kw one then the input capacitance shall be larger. A couple of 680uF or better still 1000 uF at 450v will be a better...
  7. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    Hi Michelle, Do not be mislead the video in the...

    Hi Michelle, Do not be mislead the video in the first post shows a full bridge smps while you are building a half bridge smps. As I can see the pcb takes two kinds of transformer. It either takes...
  8. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    Hi Michelle, The main transformer detail is all...

    Hi Michelle, The main transformer detail is all in the video. What other problem you have just let me know.
    I also wanted to tell you that the chip you asked me about last time it could also be...
  9. Replies
    10
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    678

    Hi Res I see you found a solution at last without...

    Hi Res I see you found a solution at last without burning the table LOL. Those immersion heaters seem a good idea. Regarding the RF power resistors well I found a video on youtube using these but...
  10. Replies
    441
    Views
    80,919

    Sticky: Can you show the feedback arrangement that you...

    Can you show the feedback arrangement that you are using? IF you are using feedback for output voltage regulation than you must have an output inductor around 20uH otherwise it will not work. You...
  11. Replies
    37
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    2,591

    Well done Res the regulation seems rock solid and...

    Well done Res the regulation seems rock solid and the efficiency is very good at over 90%
  12. Replies
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    728

    @ Scarface I agree with my friend Res, Smps is...

    @ Scarface

    I agree with my friend Res, Smps is no joke especially when they blow. Trying to create a brute for a first time is quite a task without experience.

    Some other considerations for...
  13. Replies
    10
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    678

    Hi Res here are some ideas where to source some...

    Hi Res here are some ideas where to source some heating elements, Old electric oven, old water boiler heater this can be dipped in water. electric kettle, electric iron, old microwave oven with...
  14. Replies
    441
    Views
    80,919

    Sticky: Check the voltage across the transformer winding...

    Check the voltage across the transformer winding during load and see if it is dropping from the half bridge. You can check also the input voltage AC and see if it is dropping there.

    voltage...
  15. Replies
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    678

    @ Res Hi Res, No I never tried a salt water...

    @ Res


    Hi Res, No I never tried a salt water dummy load, if that is worked for a long period it will tend to emit chlorine gas which is very poisonous.

    I had a dummy load which I made with one...
  16. Replies
    10
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    678

    Hi Res although I am a radio amature I never...

    Hi Res although I am a radio amature I never operated at microwave frequencies. I also never come by these kind of resistors.
    I made an electronic DC load but due to the low voltage capability of...
  17. Replies
    10
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    678

    Hi Res although I am a radio amature I never...

    Hi Res although I am a radio amature I never operated at microwave frequencies. I also never come by these kind of resistors.
    I made an electronic DC load but due to the low voltage capability of...
  18. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    I guess that is the PFC control chip NCP1653. ...

    I guess that is the PFC control chip NCP1653.

    Regarding Upik I sent him a message and gave him the link, now its up to him.
  19. Replies
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    128

    Hi Bogdan, I seen a lot of coverters like yours...

    Hi Bogdan, I seen a lot of coverters like yours and they all have some kind of snubber on the drain. Ringing is inevitable when the fet switches off and this must be suppresed somehow to a safe...
  20. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    I see you played quite a lot with amplifiers and...

    I see you played quite a lot with amplifiers and power supplies. I guess you have enough experience to go through this build.

    Regarding Upik yes he comes to this forum every now and then. I will...
  21. Replies
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    299

    @museatex See if you can get hold of a...

    @museatex

    See if you can get hold of a schematic otherwise I will not fully understand what you are saying. You are seeing things in front of you and I cannot see anything. Google up and search...
  22. Thread: SMPS with PFC

    by Silvio
    Replies
    29
    Views
    1,749

    Ok Michelle so you have an idea at least. Please...

    Ok Michelle so you have an idea at least. Please read the smps warnings on the top of the page. For the Pcb are you going to order it or you are going to make it yourself? Our friend Upik can help...
  23. Replies
    37
    Views
    2,591

    @ Res For loads you can get some heating...

    @ Res

    For loads you can get some heating elements from old microwave ovens. These may have grill function and usually they have a couple of heating elements rated 450w at 120v. They are usually...
  24. Replies
    37
    Views
    2,591

    Hi' Res i see you got a good result. From what I...

    Hi' Res i see you got a good result. From what I see you are loading around 1140w and input sees 1760w that is around 60% eff. This may not be true as bad power factor tend to draw more current than...
  25. Replies
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    299

    @museatex Regarding the dead time it is ok...

    @museatex

    Regarding the dead time it is ok usually it is between 1 and 1.2uS well if its just under 1uS like 960nS it does not matter it is still good. The IR2153 has a fixed dead time and does...
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