Mini Induction Heater

151121 Like and subscribe. This is an archive, check the link in the end if you are. 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
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