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Registered Member #2310
Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169
Hey folks, how are you?
I was searching on the net and found this website:
And the last circuit of this page made me wonder how would it be to make an "Mains-Powered Induction Heater" based on this circuit:
Perhaps someone with better knowledge about the subject can give us clues about the possible values of:
- Base resistors of the IGBTs (Probably something around 6.8 Ohm) - Diodes D1 and D2 - Value of "Dr" - Value of C2 (Probably a ressonant bank of capacitors if used for Induction Heating)
Probably changing "Tr" with the work-coil of IH it will start heating some bolts, what do you think?
Now wonder how nice would it be... A simple Mains-Powered IH with a few kW of power =D
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
the main problem with this is trying to get IGBTs or MOSFETS with high enough voltage (4x320 = 1280v) and the switching speed would probibly be a fair bit slower + a probible greater RDSon
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Vladi Mazzilli's original ZVS did just this, it ran off 230V mains using 1200V IGBTs. BUP314s if I remember right, pretty old slow devices. Google search should turn up the schematic.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Running this driver from 230 volts AC, with 1200V IGBTs, is a really messy thing to do. During random line voltage transients, overvoltages, due to improper design of magnetics or during load transients (breaking of the arc), the collector voltage can easily exceed 1200 volts.
Try these devices instead: (they are really IGBTs)
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Dr. Dark Current wrote ...
Running this driver from 230 volts AC, with 1200V IGBTs, is a really messy thing to do. During random line voltage transients, overvoltages, due to improper design of magnetics or during load transients (breaking of the arc), the collector voltage can easily exceed 1200 volts.
You get the same problems when 'hacking' inverter microwave power supplies. One solution is an 'isolation transformer' which is ferro-resonant (A conventional microwave oven transformer can be re-wound for this). This 'smoothes' the supply, and prevents transients from getting through.
I think there is another word for it, but I forget.
Registered Member #2310
Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169
If you have a VARIAC you can play with it too...
I've found some usefull information about the first schematic here:
The values of the components are there...
Suggestion from Dr. Dark Current are good. For sure isn't a good idea using 1200v devices unless you have a VARIAC...
What about the current limiting on this circuit?
Do you guys think that is a good idea trying to make a IH with this, or the Half-Bridges are still better choices (Thinking about reliability and simplicity)
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What about a Mains-Powered ZVS Driver?
