I am interested in finding a design for the electronic/electrical components of an induction heater for a small shop using a 220V 60Hz input.
I do not need designs for the coils and cooling system, I can handle that.
There is an interesting web page describing a simple design for a small induction heater. In another question on this SE a reader complains about getting this design to work. From the discussion there it is evident that getting a good quality induction heater design is a non-trivial problem. The circuit on this page is advertised as being 300 watts.
I have the book "High-Frequency Induction Heating" by Frank Curtis (1944), but this book mostly focuses on coils and only has one sample circuit which is old has a lot of tubes. I also have the circuit in the Encyclopedia of Electronic Circuits vol III. The key component of that circuit is the MTM15N45 power FET, but it appears that component is still being made so this might be a viable circuit since it can be with a 220V line. This circuit is advertised as being 500 watts.
(Also, according to my initial calculations my types of applications would require a 20,000 watt system, so that would be 90 Amps at 220V. Basically I would have to divert the entire power of the house to the heater while it was in use. So, the Encyclopedia circuit may be too low power.)
Is there a better circuit than this, or a more detailed resource that would be appropriate?
Maybe this is too complex and I should just buy one?