I will be more specific.
I would like to build an induction melting furnace 3.5kW.
Any as full-bridge LLC resonant inverter, see picture
Here Lcoil is largely variable depending on the content of the fused material in the crucible
I do not dare to estimate the properties of the transformer.
I do not know how to realize it yet
I built a fully insulated mosfet driver for full bridge with 9A peac current for each channel.
3,3V logic digital input , digital insulating barrier 3kV and 9A MOSFET driver on 12V.
For control I want to use fully digital control, for example STM32F334.
DC source is relized two big 400V capacitor charged directli from 230V over high current diode bridge..
Cp is 200A 1uF PP capacitor Lcooil is approx 10 turn 8mm Cu pipe 100mm diameter (wather cooled)
Now I'm solving the MOSFET transistors.
I prefer to use separate modules that I can screw directly onto the radiator without PCBs
it means SOT227 rather than TO-xxx
because of the prices something I can buy in China.
On Aliexpres in not problem buy 500V NMOSFET 50mOhm 80A on SOT227 for 9$/pcs IXYS.
In TO--xx case I find more modern MOSFET , for example
STW70N60DM2 600V 66A 37mOhm TO247 3$/pcs but not ideal for mouting without PCB.