Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

As promised, another yoke with mica insulators in between the both splits.
Both primary and secondary coils cover the whole yoke, the splits are half way underneath both coils.

That's not mica.  Mica is the brittle transparent stuff from which the insulators between power transistors and heat sinks are made of.

Both primary and secondary coils cover the whole yoke, the splits are half way underneath both coils.

I think this is advantageous for the normal transformer mode but not for the "special" mode.
I realize that GeoFusion did it this way and you're just replicating his design without other considerations.

Primary is 2x 21 turns of 2.5mm2 solid copper wire, 2x 59uH
secondary is 60 turns of 1.5mm2 solid copper wire, 478uH

Always good to have this data.
The yellow current waveform bothers me because a current spike like this cannot happen in an inductor.  Perhaps this spike is not real and the scope probe is just picking it up by induction (not from the CSR). Try moving its cable around.

Input 337W...

How did you calculate that?

I tried several combinations again of caps (also my stacked caps), chokes, loads and voltage (24/12V).

Did you try to make the frequency of the current in the primary winding equal to ½ of the fundamental acoustic standing wave frequency?

[verpies]

Last version. Dual heatsinks with bigger ceramic resistors 2 kohms...

[NickZ]

Why is this resistor bad. Don't many induction heater circuits use them? Are you sure?

[verpies]

Why is this resistor bad.

Because it is wirewound and inductive and does not act as a true resistor.  It limits current rise-times and can form parasitic LC oscillations with capacitances. If connected to gates of MOSFETs (capacitances) the switching transients will cause HV inductive spikes and punch through gate oxides.

[itsu]

verpies,

How did you calculate that?

I calculated the input by using the "mean" voltage and current values as can be seen on the scope at around 2:40 minute in the video.
The mean values where 21.52V and 15.7A.

Did you try to make the frequency of the current in the primary winding equal to ½ of the fundamental acoustic standing wave frequency?

No, as i do not know the "fundamental acoustic standing wave frequency".

I will dismantel the first yoke, and try something similar like Grumage is doing with the piezo speakers to see if i can find this "fundamental acoustic standing wave frequency"

Regards Itsu