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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
this is what I had in mind. this cap has low dissipation factor, low internal resistance, low internal inductance, allowing a high circulating current with the primary of the flyback.
this circuit uses the natural resonance of the flyback generate the output. the primary consisting of the primary capacitor and primary wndings form a parallel resonant circuit that traps alot of current. when I did this circuit I ended up like you with a thin spark but I had to expieiment with it to get it to take off. I started off with 6 turns one each half of the primary and finaly setled with 4 turns each time the current went up. once you tinker with it you will understand. another thing that may work is maby 10 to 20 little .1uf poly caps in parallel as they are peralleled the internal resistance will go down.
Registered Member #2998
Joined: Tue Jul 13 2010, 08:34PM
Location: Swedish forests.
Posts: 26
A those power levels you might have a problem getting it to run smoothly, depending on what components you use. We're only talking 48 watts of power here unless you wish to exceed the ratings on your low voltage transformer. That might "blow up", or rather melt, if you try to push all the nessecary power through it.
The larger the capacitor and inductor in the circuit, the lower the frequency, correct? I am thinking of making a lower frequency device because of my lack of fast diodes (600 ns isn't that good) and because of that I wish to focus on efficiency rather than power.
The flyback core is an older one that might not cooperate with the higher frequencies, yet another reason for the lower frequency focus. I am using two monster IGBT's of 72 amps 1,2kv and 20ns each, so this will obviously not be the weakest link. As I said, it's the diodes. Any tips? Again, the focus is efficiency, not power, preferably 20-40kHz-ish.
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first zvs/mazilli driver!Help!
