Kapanadze Cousin - DALLY FREE ENERGY

[AlienGrey]

Nick Hi had a look at your Scop shot of your yoke photo, If that's your device I would say your transistors are in an 'not on or off but in a resistive mode if I were you I would go for a different winding to try and minimise the effect or get a better 'core' you want the ringing in the transistor off time or dead time, I sincerely hope this helps you.

PS I had this problem my self.

Allen

[NickZ]

  I don't know what you're talking about. My fets and yoke are working fine.

[Hoppy]

Nick,

Although your dead time control on the PWM is OK, the 'effective dead time' may not be and this can be checked with drain to source current waveforms as suggested by Itsu.

[Hoppy]

   Hoppy: There is no problem with the dead time controls. I can raise or lower the duty cycle as needed. And there is always the minimum dead time between cycles.
   Adding another load by connecting up the feed back path is not going to lower the heating, but raises it instead. Just like it does when I place any more bulbs on the output. In any case we'll see what happens, soon enough.
   I'll show better scope shots when I get the chance.

OK, so you have now tried feeding back. Did your lamp get brighter?

[NickZ]

   Itsu: just how should I test for the current wave form?

    Hoppy: No, I have not connected the feed back circuit up, yet.
   There is no point in connecting the feed back circuit until I resolve the snubber heating issue. The induction circuit need to be able to work well by itself, first.

  Itsu: Is it possible to show in a short video of your induction circuit lighting 400 watts worth of bulbs, for a few minutes run time? As well as showing the lumin output at your bulbs, and the temperature of the snubber resistors?