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Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
I wrote the same thing on the projects section, but i don't think it's the right one in fact, i didn't receive many answers.
Yesterday, when trying it for the first time i had some problem. The risonance capacitor, after a while starts running very hot, enough hot to lose is form and start swelling.
Since i can't set any kind of dissipator on the capacitor, what can i do for lowering his temperature while running? Another problem is also the flyback tranformator, in fact, when it started running (5+5), the windings (normal 1mm wire), has literally liquefied and again, i would also like to know some furter use of the zvs driver, because until now, i've only heated up nails and tried some spark with the flyback. My supply is gave by my homemade 15A 1.5-39V Psu
Anyway, after some tests, I have noticed that the absorb has increased from 10-12A to overo 20... Why that? The flyback, still emits some spark, but it's very thin and short, while the induction heater doesn't even work anymore. What could be the problem? thanks in advance.
Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
Hello thanks for answer, so far i'm making some test with different types of capacitors. I've noticed that yesterday, with a combo of 400volts 1,5uF 2x250volts 2.2uF i had the best result and the lowest amp drain. Now i made some test with an array of 7 400volts 0.56 uF, i had some arc, but it's not like yesterday, and the amps drain is much higher (like 16 instead of 9-10). Then i have tried with a giant 33uF mkt capacitor, and the amp drain is very much higher(over 20), and no arcs. I'm still trying to understand the ness between capacitance and drained amps. But.. I don't get it. Can somebody help me realizing how it works? Thanks.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Unleashed wrote ...
So the best way of doing it it's making tries? Anyway, how many windings should i make on the primary? 5+5 or 4+4?
Im no expert... but its my understanding that with a lower turn winding such as 3+3 you will have bigger arcs but it will cause harder switching and more heating to a degree. ie: you wouldn't notice the difference running it with 12v with 3+3 or 5+5 as far as heating goes, but i think it plays a bigger role in higher volts and amps.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hello -
My biggest suspicion is simply that your flyback is dead, and that's why it is pulling huge current and giving wimpy arcs. There is no way this circuit should pull 15A at 40V with no load, something is doomed to blow up very quickly that way.
Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
Thanks for the answer. The fact is, that i've tried another flyback and this time i get always ultra absorb, and this time not even a little arc. Maybe this one is fucked up as well, i can't know because it's from a old tv that i found in the street. Anyway, i will try with some other flyback when i find one. Thanks.
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Royer ZVS
