zvs induction heater issue

Discussion in 'The Projects Forum' started by lokeycmos, Dec 9, 2009.

  1. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    432
    7
    i built this circuit http://kipdev.nl/labs/wp-content/images/zvs_driver.png for a flyback driver and it works great! i can pull some wicked arcs with it. the mosfets dont even get remotely warm. ive been researching online about using the same circuit for an induction heater. i tried it for about a 10 second run as induction heater. the screwdriver got to hot to touch, but the MOSFETs got smoking hot. I tried it from 4+4 turns upto 7+7 turns. am i missing something or is there something i can do to modify the circuit so the FETs dont burn up?does the guage of the wire matter? thank you in advance
     
  2. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    432
    7
    anyone have any ideas?
     
  3. ams-laser

    New Member

    Feb 27, 2009
    2
    0
    i hope we get some answers i have same question as the tread starter

    any answers

    Regards
     
  4. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    Induction heaters use VAST amounts of current. Your flyback device is a high VOLTAGE system.....great for DIELECTRIC heating, not induction heating!

    YOu need a stepdown transformer at the very least....to a mere fraction of an ohm.

    eric
     
  5. ams-laser

    New Member

    Feb 27, 2009
    2
    0
    im using a zvs flyback DRIVER not driving a flyback but instead just the primary coil and as core the pice to be induction heated.

    please advice
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Perhaps you could post the circuit.
     
  7. wolf08

    New Member

    Dec 14, 2009
    14
    0
    you need to take the core from a flyback wrap a 5+5 winding on it and then wrap about 5 to 8 turns of think gage wire on the other side. that gives you AC at a low voltage but at high amp
     
  8. AfdhalAtiffTan

    Active Member

    Nov 20, 2010
    117
    11
    Maybe it's caused by your diodes... :p
    At least, that what's happened to me before. :rolleyes:

    Use a faster diode... :D
     
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