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Published on Dec 30, 2007
Due to scepticism about my home made induction heater by some people. I thought I would add another video. This updated power supply uses a normal half bridge igbt inverter with a conventional induction heating setup. The heater melts a 50p coin and a crome vanadium steel allen-key socket. For those interested...The frequency lock is achieved using work coil current feedback to a free running oscillator which drived the two hgtg20n60a4d igbts through an ir2184 drive chip. The secret to melting steel at low power is to use less turns on the work coil. Molten steel has a much higher resistance than cold steel and requires less turns to couple energy to efficiently. The current used here was 13 amps at 240v (3.1kw). Peak igbt current was 50 amps at 120 khz. The capacitors are the only critical component- i used celem csp150/200 's 2 x 1.6uf