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Forums
4hv.org :: Forums :: General Science and Electronics
« Previous topic | Next topic »   

What wrong with my new ZVS?

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Platinum
Sat Apr 07 2012, 11:55PM Print
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		I made a thread about my rebuilt ZVS, but it works, but not normally.

It can drive a flyback, but then it makes a very bad noise in the arc.

I can't be used an an induction heater or to drive my ZVS SSTC.

Any ides whats wrong?

Thanks :)
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Harry
Sun Apr 08 2012, 08:25AM
Harry Registered Member #4081 Joined: Wed Aug 31 2011, 06:40PM
Location: UK
Posts: 139
 		I think we need some more details.
What components are you using?
Are you sure these are working?
Any solder bridges?
Perhaps a picture?

Cheers, Harry.
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Platinum
Sun Apr 08 2012, 03:42PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		I'll try to get a picture.

I'm using 25n120's, .57uF 1KV cap. The usual 10kohm resistors and 2 470ohm resistors, 12v 5w zeners, BA159 diodes. And a big PC indcutor.

That's all I can say really. The IGBT's get hot-ish.

And it can drive a flyback but that's it. Any other task and my powersupply hums loudy because it pulls alot of current.

It not the best circuit I've
made. I fail at making them anyway.
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Thomas W
Sun Apr 08 2012, 04:09PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		i would think its a good idea to up the 470 ohm resistrors the higher the voltage you use so you dont burn out the IGBTs, what voltage are you currently running at?
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Dr. Dark Current
Sun Apr 08 2012, 09:33PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		If you are running more than 40 volts, the tank capacitor is probably too big. For an induction heater, on the other hand, its probably too small... What is the exact model number of the IGBTs? Maybe they are too slow and/or have a high gate charge.
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Platinum
Sun Apr 08 2012, 10:37PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		They are k25n120 by infineon. I'm running on 45v but drops to 30 odd.

It can drive a flyback, but nothing else, very weird.
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m4ge123
Mon Apr 09 2012, 12:19AM
m4ge123 Registered Member #4118 Joined: Mon Oct 03 2011, 04:50PM
Location: MD
Posts: 140
 		I would guess that your primary/tank coil has too little inductance.
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Gabriel35
Mon Apr 09 2012, 01:57AM
Gabriel35 Registered Member #2310 Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169
 		Try using IRFP260N!
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Platinum
Mon Apr 09 2012, 02:36PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		But why can't it work with these IGBT's?

I also have


2x IRFP460A 20A 500V

7x SKW25N120 25A 1200V igbt

4x 30N60 30A 600V igbt

20x RFP40N10 40A 100V

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Platinum
Mon Apr 09 2012, 08:47PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		A badly built ZVS by me.

BMuub
I've checked the circuit over and over, everything is the way it should, but it can only drive flybacks ?

[Edit: Image size]
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