This video shows how I build a ZVS driver to power a small induction heater than can make pieces of metal weighing ~1 gram or less glow red hot. The circuit takes in 10-16V and the final variant shown in this video oscillates at about 160 kHz. I also show how this circuit can be used to drive a flyback transformer.
This is a very modestly powered circuit, but the advantage of a ZVS driver is that it can be scaled up to tens of kW without much of a problem. The voltage on the coil (and the MOSFET V-DS) is about 3 times the input voltage, so to use higher voltages of say, 36 or 48V, I would need MOSFETs rated for a higher V-DS like an IRF250 or IRF460.
NOTE: My statement about inductance not changing is inaccurate. Inserting a ferromagnetic object into the coil *does- increase the inductance and reduce the frequency.
Hardware used:
IRF44 Mosfet
1N4148 Diode
5.6V Zener Diodes
400 Ohm Gate Resistor
10k Gate pulldown resistor
1 uF 630V Polypropylene film capacitor
Music:
Kevin MacLeod - George Street Shuffle
Serge Pavkin - Fractal