Why do you have a 3000uF capacitor on the secondary of the 10 VAC transformer?
It should be on the other side of the rectifier. Or is it just misdrawn?
What's the purpose of the 3600 Ohm resistor?
there's a chart on the data sheet for the MOSFET that's labeled "Safe Operating Area" for DC and pulsed operation, the SOA is roughly triangular. since the duty cycle of the MOSFETs are roughly 50%, the SOA will be somewhat larger, and the SOA curve looks like a box with a corner cut off, but still if the devices go outside the SOA curve, they will likely self destruct.Mosfets explode at 35 amps even though they are rated 55 amps.
Um. Induction heating works at high frequency. High frequency conducts through skin-effect. Larger diameter wire, more 'skin', more current, more heat.12 wire is rated 20a and #10 wire is rated 30a, I thought #10 wire will run cooler but it runs hotter. This is crazy??????
Is this a lesson on skin effect?
I'd say it's more a lesson on convection. Why would you even use insulated wire? The induction heater I've seen that did have insulated coils had ceramic insulation, not PVC. And most are made from copper tube with cooling water running through them.