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  1. Replies
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    Sticky: Regarding the threshold voltage which the over...

    Regarding the threshold voltage which the over current protection triggers is around 2.5v. As you can see the rail voltage to the opamp is 5v, this is divided by 2 with R123 and R118. (22K) creating...
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    Sticky: Hi Ravs, I see no detail in schematic for the...

    Hi Ravs, I see no detail in schematic for the current transformer however in my version I used a ratio of 22:1. I suggest you select a green core instead and the diameter of this core may also be...
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    The compensation and feedback is all there in the...

    The compensation and feedback is all there in the schematic.

    Regards, Silvio
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    I just realized that our friend is using an...

    I just realized that our friend is using an IR2153 chip however the chip cannot be regulated. The output inductor is not really needed and maybe only a small one is necessary such as 6uH to block...
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    @ norazmi I think there is a little error...

    @ norazmi
    I think there is a little error regarding the transformer details. An ER35 has a center core diameter of 1.1cm^2 and not 1.3cm. Regarding the formula itself I guess the voltage at the...
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    As far as I can see the pulse is not right on all...

    As far as I can see the pulse is not right on all the scope shots. The pulse should show more like a square wave rather than a spike.
    The configuration of the TL494 is rather odd, to my believe...
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    Well this is up to you if you are to abandon the...

    Well this is up to you if you are to abandon the simple circuit. All i can tell you be aware of fake chips, my experiance with this is hell when i was building my first smps. If you like to know...
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    @FiFi 22 Hello fifi I had just seen your post...

    @FiFi 22

    Hello fifi I had just seen your post and I am going to try to help you solve your problem.
    A few things to consider.
    A transistor in an smps is usually switched hard in each duty cycle...
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    I read the same thing while reading Tahmid's blog...

    I read the same thing while reading Tahmid's blog way back a few years ago when I was learning about smps. This guy used 1K resistors, which I think now its a bit too much and will waste energy...
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    I guess you did not understand our friend Deltor,...

    I guess you did not understand our friend Deltor, If you intend to use a pull down resistor this is there so that any build up charge on the gates will be discharged. This will only help in the...
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    Sticky: Hello again, I made some calculations and found...

    Hello again, I made some calculations and found out that one core can give the power needed. I would rather go for full bridge at this power. I cannot read Russian and do not know exactly the...
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    Hello Steven, I was just looking at the...

    Hello Steven, I was just looking at the schematic and these are a few of my taughts.

    1) Why is the PFC voltage set so low? Usually we start at around 360 to 380vdc. Do not forget that the mains...
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    I sent you email with spreadsheet of NCP1653 pfc...

    I sent you email with spreadsheet of NCP1653 pfc chip
  14. My setup powering an 8w lamp 12v. The supply...

    My setup powering an 8w lamp 12v. The supply input was 16v
    7236
  15. Hi Steven, I do not think CAT 5 wire is siutable...

    Hi Steven, I do not think CAT 5 wire is siutable to fit in a ee16 trafo. Each wire has a dia of 1mm and the copper inside is 0.5mm. The reason I used this kind is to have more security regarding...
  16. Here are some test that I have been conducting. ...

    Here are some test that I have been conducting. I made myself a GDT for a full bridge smps and I was trying to find the best way to get a good waveform.

    The schematic below of my setup. You...
  17. Dear Sukdeb, You can see that when using a pulse...

    Dear Sukdeb, You can see that when using a pulse transformer the wave shape will not always be so pretty. This depends on how well this GDT is made. Noticing also the pulse arriving to the gate it...
  18. Well ok about the switching frequency. What I...

    Well ok about the switching frequency. What I suggest for you is that you put a series lamp (100W) in the input of the high voltage rail. This will prevent the stored energy in the capacitors...
  19. What I can see for the moment is that in both...

    What I can see for the moment is that in both shots of your scope your running frequency is different one is 37 Khz and the other is around 50khz. According to the timing capacitor and resistor used...
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    Tell us more about your project maybe a schematic...

    Tell us more about your project maybe a schematic will help us more to understand .
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    That is quite normal and the reason is that the...

    That is quite normal and the reason is that the high side is charged from the capacitor and not from direct dc. In circuit it would behave differently and do not worry the voltage at the high side...
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    @Bogdan 2011, With the video that I saw and...

    @Bogdan 2011,

    With the video that I saw and also the changes you have made it seems that there could be something wrong somewhere. It also could be the case that there may be a shorted turn in...
  23. Thread: SMPS Repair

    by Silvio
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    Hi I can see it is an smps with power factor...

    Hi I can see it is an smps with power factor correction at the input. As MicorsiM said a picture which can show the oscillator and also the pfc chip will greatly help. If you can state where this...
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    @ Steven Quote @ silvio what core may i use...

    @ Steven

    Quote
    @ silvio what core may i use and how many turns should i turn? i have lots of iron powder cores t130-10(black core) t130-26(white yellow core) and t130-52(blue green core)
    which...
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    This is a very basic circuit that I see. What is...

    This is a very basic circuit that I see. What is not appropriate is that the gate resistors should not be less than 22 ohms I guess 27 ohms will be better not to load unnecessarily the IR2153. You...
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