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Registered Member #2310
Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169
Hi all! I was a little away from the forum and electronics for a while, but now I have more time again, and my wish of making a decent Induction Heater for me is "calling" me again... xD
So i was looking for a nice circuit for me, and I saw Eirik Taylor's one, and with it, Jab's variant of the Driver... I've already tried Danyk's one, thats manually tuned and is pretty strong too, and i got it to work well but when applying 300vDC, some misterious IGBT failures occured, taking the IR2153 Driver with them. I've tryied mazzili's driver too, and its pretty boring. So now I think it's time to try some PLL driven thing. =) The schematics of Eirik and Jab's variant are here:
Occording to them, i've made some changes to the revised version of the schematic agreeing to the components that I had acess. And the schematic took this face:
Now, I need to ask some questions... Mostly about the red noted parts of the schematic...I just want to know if the components that I've changed can affect the whole thing in something? About the BC547 Transistor... And about where the Tank voltage reference goes? between the inductor and capacitor or after them?
I ave some doubts about the IGBT too... This is the only one that i have here at home... and it's rated 1200v @ 35A (The datasheet is on the end of topic) Can I use more than only 2 ? this pack is a 3 phase pack, including 6 IGBTs, can I parallel 2 or 3 for high side and low side? What abou the gate capacitance and resistance? I'm asking that because I've played with some 20A devices and they fried when I applied more that 170v on the bridge and started taking off L-match inductor's turns of wire. I took some scope tracings of the waves too, but that was when I powered the bridge with only 50vDC, and I think that it was too low for the comparators to have feedback...
The last quaestion... When Eirik first posted the schematic on his website, he posted a calculator too... for that Current and voltage limiters... does that parameters keep the same with those modifications on the comparators of voltage and current? That Min 130 and max 550v is a range? or the minimum resistance of the trimpot means 130v and the max 550v? i'm a little confused about that.
The promised pics of the scope tracings...
Gate driver unloaded(bridge with no power and GDT not coneted to the IGBTs)
Gate driver circuit conected to IGBTs and running with low voltage on the bridge.
The whole circuit is working but I still have those doubts about the components... I've managed to get a screwdriver pretty hot using it, but i took out more turns of the inductor and changed the wire (the other was heating a lot) and the 20A IGBTs fried...
I've tryed to take a photo of the inverter output but no sucess...I'm not familiar to a scope yet.
Thank you! PS: Sorry for my english, I'm brazilian.
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Experiencing the PLL Induction Heater
