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Registered Member #2721
Joined: Fri Mar 05 2010, 04:09PM
Location: Guadalajara, Jalisco
Posts: 28
Hi,
i have constructed some ZVS drivers first using IRFP460's worked great at 12v but only 3 to 5 secconds using 24v50A psu, swhitched to IGBT's and now works for about 10secs before the IGBT dies, im using 12v zener diodes with 10k paralell resistors, the main divider is 2x 270ohm 5wat resistors, i want to use this circuit as an induction heater to solder tungsten tips for lathe tooling, is there a way to wind the 5+5 turn coil so it is balanced (metal partially inserted into coil)
i build a SMT version one and this died at 24volt also look here
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
It is hard to tell what is going wrong from your description. Post pictures and a schematic of exactly what you have built. ZVS drivers are very robust and you should not be destroying any 460's with only 24v. Are the parts overheating? Are your 5+5 turns on a ferrite core? Post pictures so someone can point out any obvious mistakes.
No, If you want to do an induction heater with a ZVS driver, you will need to wind 5+5 turns on a large ferrite core, then make maybe a 10 turn winding on the other leg of the core, then couple that winding to your work coil or LC circuit that includes your work coil. A ZVS based induction heater is probably not a good idea. You will be more successful if you pursue a "real" induction heater topology.
Registered Member #2721
Joined: Fri Mar 05 2010, 04:09PM
Location: Guadalajara, Jalisco
Posts: 28
Ok, The parts wont even get warm, the 5+5 turns are on a flyback ferrite core, works great at 12v and even 18v but the mosfets or IGBT's die at 24Volt 50A power
Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
As Jan said, you have an error in the schematic. Just want to add, you might want to give some credit to the one that actually came up with that circuit, Vladimiro Mazzilli...
Registered Member #2721
Joined: Fri Mar 05 2010, 04:09PM
Location: Guadalajara, Jalisco
Posts: 28
LoL, no wonder why, the zeners where getting fried and the fast diodes where not protecting the gates, same goes for the SMT version, by the way, just got a couple toroids will these be more suitable ??
Registered Member #2721
Joined: Fri Mar 05 2010, 04:09PM
Location: Guadalajara, Jalisco
Posts: 28
i swapped the diodes, (using new zeners) and it worked at 24v 50A giving 2inch ac arcs on my flyback, however i removed the flyback and used the 5+5 air core inductor (actualy not air core since i placed a scredriver inside) but the mosfer blew up inmediately, i have used this setup at 12V and the screw driver would heat up, but this time it got not even warm. any advice ???
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
I doubt this driver will work without a core! I suspect that with an air core, you will need very good coupling between the windings and many turns so that you maintain a reasonable inductance. If you want to do an induction heater, use an intermediate ferrite transformer.
Registered Member #2564
Joined: Tue Dec 22 2009, 05:26AM
Location: Riga, LV
Posts: 11
My ZVS IH setup: 2xIRFP064 mosfets, 470Ohm resistors, 12V zeners, UF4007 Diodes paralel with 39pF caps, 26V PSU.Inductor :2*3wind. Cu 8mm pipe, 50mm ID, 20x150n@250V foil caps in paralel. f~130kHz, power draw 4A empty, 40A max load.
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ZVS driver help! 24v 50A psu zenners ????
