Identifying the type of this circuit

Discussion in 'General Electronics Chat' started by Ermiya, Aug 10, 2015.

  1. Ermiya

    Thread Starter New Member

    Aug 10, 2015
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    Hello to everyone !
    I am trying to know what type of circuit this circuit is. More specifically, I wanted to know why this combination of components make a low to high voltage converter. I also wanted to know how to increase the output - I was thinking changing the capacitor but I'm not sure...
    Would be grateful if I got some useful answers.
    I have attached images of the PCB for further info.
    Some info :
    Input = 3v
    400V Cap
    For more info, just ask :)
    Best Of Luck
    - Ermiya

    811823356_97735.jpg 811840623_52129.jpg 812231225_23208.jpg 812239070_23522.jpg
     
  2. Jony130

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  3. Ermiya

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    Aug 10, 2015
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  4. Ermiya

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    Aug 10, 2015
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    EDIT : It might do ....
     
  5. blocco a spirale

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    Jun 18, 2008
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    Much has been written on the subject; no point repeating it all here. Google "flyback converter".
     
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  6. dl324

    Distinguished Member

    Mar 30, 2015
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    If you want an answer, trace the board and post the schematic.

    You didn't mention the output voltage, but increasing output voltage would likely require increasing the voltage rating of the cap. You have the board, do some experiments. Lower the voltage a bit and see if the output voltage changes.
     
  7. Ermiya

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    Aug 10, 2015
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    Thanks ... Will do
    What about my other questions ?
    EDIT : ANSWERED BY SOMEONE ELSE
     
    Last edited: Aug 10, 2015
  8. Ermiya

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    Aug 10, 2015
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    Thanks for the info ...
    If posting the schematic will help, will do that as soon as I finish tracing the board .
     
  9. Jony130

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    Try to goggle blocking oscillator or Joule thief. Because your circuit is a classic blocking oscillator. And changing the capacitor will not change the voltage. You need to change transformer turns ratio.
     
  10. Ermiya

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    Aug 10, 2015
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    Will post a schematic soon to make sure of that.
     
  11. Ermiya

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    Aug 10, 2015
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    So is it a flyback converter or a blocking oscillator ?
     
  12. Jony130

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    Your circuit is a self oscillating version of a flyback converter also known as a blocking oscillator.
     
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  13. Ermiya

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    Aug 10, 2015
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    Thanks to everyone who answered....
    The schematic is taking a while ....
     
  14. blocco a spirale

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    It looks like an inexpensive board with marginal room for improvement as it stands. You will probably find that doing anything to increase the output of that particular module will lead to its early demise, especially if you increase the input voltage.

    A larger value of capacitor will store more energy but will also take longer to charge and if you go as far as upgrading the inductor, you might as well start from scratch.
     
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  15. Ermiya

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    Aug 10, 2015
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    Thanks for the info. Realised this from the previous answer.
    Extracted that this circuit is a self oscillating version of a flyback converted and is not worth modifying. The only question which remains I think is that do you have a better schematic of this circuit?
     
    Last edited: Aug 11, 2015
  16. Ermiya

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    Aug 10, 2015
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