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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
The schmitt trigger has a voltage limit. You are just trading one problem for another. The mosfet has a 30v gate limit. The schmitt probably has a smaller limit, so I don't think this is the answer you are looking for.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Hm. Well, no, because i was planning on sort of...making a smaller, less amplitude of the rectified sine wave, at the appropriate voltage limit, and feed that into the schmitt trigger, which feeds into a gate drive IC, to the fet's gates.
Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
Inducktion wrote ...
haxor5354 wrote ...
i just tried it out with 2 IRFP260 and used 2 lead acid batteries to power it up and the power cable "exploded". almost gave a heart attack. but i didnt even put a work piece inside the coil yet :(
Did you make sure the fet's were facing the right way, i.e the source and drain aren't mixed up? Are all the wire connections correct? Also, your work coil needs to be litz wire or copper piping, thick gauge will work but will heat up a bit too much for me. The Mosfets need to be decently well heatsinked as well. I don't know why your power cable exploded, but make sure that everything is connected correctly.
im pretty sure i soldered everything correctly. infact i even tested it out on a 12v ATX power supply and it works well. since my 1.3 - 26v variable PSU can't supply much current, i just used 2 lead acids to get 24 volts and BOOOM the cable exploded. :(
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Hm. Well, maybe it ISNT current limited then...
Alright. Try adding around a 100 uH inductor in series with the + voltage input, and see if that possibly solves the problem... Unfortunately I can't really try this myself, batteries being bad and whatnot. Post back and tell me if it works right?
Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
well, i have to try this when my fets arrive from china, gonna take 3 weeks or so. just used my last 2 fets for a 12v to 200v DC-DC converter for my Xenon strobe light
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
This circuit is terrible. It will destroy your FETs from gate overvoltage as many people already pointed out. The exploding power cable is exactly what I'd expect, as the FETs melt into lumps and short out the battery. Adding an inductor will only make the gate voltage spikes worse.
Don't waste your good transistors, build the Mazzilli/ZVS instead.
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Inducktion Heater!
