Induction heating

Discussion in 'The Projects Forum' started by Experimentonomen, Mar 29, 2011.

  1. Experimentonomen

    Thread Starter Member

    Feb 16, 2011
    331
    46
    Heres a project i've worked on on and off for the last 4-5 years.

    A 2-3kW induction heating machine.

    A video of the current prototype: http://www.youtube.com/watch?v=Y_nxQapTmQU

    Some specs: Resonant frequency around 30kHz, PLL control with a CD4046 pll ic.
    power control with a buck converter feeding the DC bus, not yet hooked up, series resonant tank circuit with transformer from old 3kW smps.
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Nice! Would that work for aluminum? A fantasy (and it is just a fantasy) is to melt aluminum cans and make sheet stock. The stuff is expensive, hugely so.

    How are you powering it? It isn't exactly house current.
     
  3. magnet18

    Senior Member

    Dec 22, 2010
    1,232
    124
    That is a LOT of capacitors. :D

    Does it really turn purple IRL, or is that a trick of the camera and uv filters?
     
  4. Experimentonomen

    Thread Starter Member

    Feb 16, 2011
    331
    46
    I run it off the 230V 10A outlet in the kitchen, living room only has a 6A breaker.

    No its not purple irl, thats just the crappy cheap camera with no uv filter.

    140pcs of cheap 150nF 1000V capacitors from TME in parallel to share the current, some hundred amps total.

    And yes it can melt aluminum no problem.
     
  5. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    Where do you live that you have 6A breakers?
     
  6. Experimentonomen

    Thread Starter Member

    Feb 16, 2011
    331
    46
    I live in sweden in an old apartment.
     
  7. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
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    Aah, I just re-read some of your posts. Your outlet standard is 230V. That explains it. By the way, I loved the video. It is very impressive! ;)
     
  8. Experimentonomen

    Thread Starter Member

    Feb 16, 2011
    331
    46
  9. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
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    Be aware that repeated trips will eventually damage the breaker where it will trip below its current rating. Also, have you asked your neighbors if they're experiencing any TV, radio or other interference? It's always best to not make your neighbors despise your work. ;)
     
  10. Experimentonomen

    Thread Starter Member

    Feb 16, 2011
    331
    46
    This think only runs at 30kHz = nowhere near enuf to cause radio/tv disturbance. And we have digital tv here = almost immune to disturbance.

    The kinda breakers we have here are round ceramic ones with a melt wire inside.
     
  11. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
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    When I was watching the video I thought I saw something throwing a large arc, hence the reference to RFI. Probably an illusion. BTW, that's not a breaker, it's a fuse.
     
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