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Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
I had to cancel the heating proces becuase the washer started to give off too much smoke. Also i'm alittle scared to actually go up to melting since i don't have any good stuff to protect wooden table from hot metal.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
HFsstc-freak what type of capacitor are you useing and do you have any recomondations. I want to do what kizmo is doing in his last thread because I cannot find any ceramic induction capacitors. any recomendations from any body my buget is about 100$
Registered Member #1223
Joined: Thu Jan 10 2008, 04:32PM
Location:
Posts: 133
Teravolt: Ceramic capacitors are used mainly in vacuumtube type induction heaters. Most solidstate types are using polypropylene- or similar cap or caps. Im not sure about construction details of celem caps but i think those are not ceramic. Just take a look for good quality polypropylene film-foil capacitors from Wima, Rifa etc. dv/dt is critical value so try to find caps that has high dv/dt value. It should be several kilovolts / µs. Im using 12 x 220nF plessey KP capacitors in parallel configuration (polypropylene foil) and they are just fine for 1..2kW.
It has still same driver board as previously but new halfbridge PCB is from MIG-welder. IGBT module is Semikron SKM150GB (150Amps) and it is faster than my previous one(Risetime 80ns/falltime 70ns, on/off times 160 and 40ns). Tank res. frequency is about 60kHz. And here, inverter current waveform: http://www.elisanet.fi/tonskulus/ssih/v2_current.jpg Inverter voltage (measured from lowside igbt's D-S): http://www.elisanet.fi/tonskulus/ssih/v2_voltage.jpg
It is working good, so far 230V and 15Amps input has been tested. But im still worried about self-oscillating schmitt trigger. The resistor beetween i/o of trigger requires lots of care and finetuning. Mistuned resistor may lead excessive current drawn and may cause igbt failure. No matter if it's adjusted too high or too low, bad things may occur. i think that trigger is trying to mix these two signals and it messes everything up, it just cant be stable for reliable operation. So maybe it is time to go back to 4046 VCO..?
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OMG Induction Heater
