ZVS Induction Heater Doubts

Discussion in 'General Electronics Chat' started by Gabriel35, Jun 29, 2009.

  1. Gabriel35

    Thread Starter New Member

    Jun 28, 2009
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    Hi All!
    i've builded a ZVS Induction Heater, based on the following circuit:
    http://diymania.hv4all.com/zvs%20ih.PNG
    so , i got it working once, but now i can't make it work anymore, the think just kep doing a noise like "bzzz" and the toroidal inductor heats like crazy...i don't know whats happening, maybe it can be insulation problem due to high frequencies , i dont know...
    for a few moments it worked once, but now it's not working anymore, i've revised all the circuit and i think that the problem is os the work Coil or the wires that are connected to it....
    anybody have a suggestion?

    Thank you!
     
    Last edited by a moderator: Jun 29, 2009
  2. Gabriel35

    Thread Starter New Member

    Jun 28, 2009
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    0
    no, the mosfet is working normally ive tested it
     
  3. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Is the 0.1 - 1 uF capacitor in working order?
    If the capacity is to low the frequency will go up and probably giving trouble with swiching speed.

    Greetings,
    Bertus
     
  4. Gabriel35

    Thread Starter New Member

    Jun 28, 2009
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    that means that the value that can be used is fron 100nF to 1 uF, i'm using two 330nF 630v in parallel, what ones do you recomend?
     
  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    In the schematic is atated MKP or MKT type capacitors.
    The value (0,1 - 1 uF) stated is to optimize the oscillator frequency.
    What type of capacitors do you use?

    Greetings,
    Bertus
     
  6. Gabriel35

    Thread Starter New Member

    Jun 28, 2009
    4
    0
  7. bertus

    Administrator

    Apr 5, 2008
    15,638
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    Hello,

    The type of capacitor is not specified in your picture.
    Here is a page from WIMA on capacitor applications.
    http://www.wima.com/EN/applicguide.htm
    For a kind of flyback circuits they use the MKP10 series. (see attached PDF).

    Greetings,
    Bertus
     
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