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first of all, I´m not engineer, not physics and not "math-man", so you know this, I can afford explain my problem, I´m building an induction heater following the instructions found in net (I understand the schematic and I have builded another one and it works!!-with IRFZ44N).

enter image description here

Now I´m using a

  • IRFP260N (2x) as MOSFET,
  • UF4007 (x2) as ultrafast diodes,
  • 1N4742A (x2)as zener (12V),
  • 10Kohm (x2) resistors,
  • 470ohm 2W (x2) resistors,
  • MKP 1.08 uF (0.27x4) capacitors non polarized,
  • and (ATENTION) one inductor from another chinese induction heater (I do not know the value of inductance), the main coil has 4.603 uH.

The problem is that when I apply 12 V only the MOSFETs get overheating without another effects, I think that´s not a short circuit and i think it´s because

  • a) same frequency oscillation,
  • b) because of the inductor.

I do not know how afront this, lot of thanks and sorry for my english

I add the link to the schematic: https://spaco.org/Blacksmithing/ZVSInductionHeater/1000WattZVSInductionHeaterNotes.htm

In future I will add my own schematica but it´s very similar except the inductor

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    \$\begingroup\$ I have tidied up your post for you. We need the schematic diagram so we can see how it is supposed to work. Click the "edit" link below your post and add one from the original article (and a link to the article) or draw one using the CircuitLab button on the editor toolbar. \$\endgroup\$ – Transistor Dec 24 '18 at 18:28
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    \$\begingroup\$ The reason why it would be good to provide a circuit is so that we can see what components you have connected... \$\endgroup\$ – KingDuken Dec 24 '18 at 18:32
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    \$\begingroup\$ All other problems aside, how long do you expect the solder and the plastic clamp survive? The induction coil gets warm, too. \$\endgroup\$ – Janka Dec 24 '18 at 18:59
  • \$\begingroup\$ Lot of thanks Sparky256 but I do not know how to make that, I have done another induction heater with IRFZ44N with the same schematic and it works fine. \$\endgroup\$ – Doc_Physics Dec 25 '18 at 22:51
  • \$\begingroup\$ @Sparky256 While it is a 'joke' it is also the low cost well established standard circuit for vastly vast numbers of such devices. Stability is 'good enough' when they work. In this case he may have Q/coupling/drive level/Murphy/... issues. Once sorted it's liable to work 'well enough'. \$\endgroup\$ – Russell McMahon Dec 26 '18 at 2:37

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