 ZVS flyback driver capacitor value question
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ZakWolf
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Mon Jan 10 2011, 08:54AM
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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
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Posts: 608
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I was using my ZVS flyback driver last night and was thinking about making a sstc with it and then that led to me thinking about the tank capacitor value and that led to wonder what i was using. i couldn't remember the value in the schematic so i looked it up and it said .68 uf, i looked at mine i am using two caps one at 250 v at .68uf (gets to hot alone) and a smaller one at 250v at 3.3UF!! I have found the lower cap value's decrease output while anything higher than .68uf seems to have know effect on the output. Why is this and what happens if you increase the tank capacitor ?
Another question: Some of you might remember me talking about building a sstc with my ZVS flyback driver and asking about the capacitor value. I didnt have anything with 250v rating and a low enough value to use for the sstc (trying to match resonant frequency). So i used what i had at hand, a homemade salt water capacitor that holds 3nf (I use them for my sgtc) i replaced the tank cap with the salt water and made a 3+3 tap for the sstc primary and fired it up. I didnt see any break out so i touched the top with a metal rod and drew a small fat flyback looking arc. I shut it down and checked for heat, the 50v 24 amp rectifier was supper hot and the fets were very hot as well i let it cool and tried it again same thing. If i had the proper cap could i get decent results and why were they like flyback arcs and not long string purple arcs?
Thanks sorry for rambling
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ZakWolf
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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
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how big of a secondary would i need to drive the coil with a ZVS flyback driver
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