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Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
I just finished my "proper" ZVS driver today, all my previous ZVS drivers that blew up on me had the same issue and i just found that out a few days ago O.O so the zener diodes HAS TO BE 12 VOLTS, before i knew that, i was being cheap and scavenge random glass diodes from scrap circuit boards. no wonder the mosfets heats up so easily and explode! grr!grr!grr now that I have made a proper ZVS driver, it can drive an extra large projection TV FBT flawlessly. After 10 minutes of play time, teh FBT was warmed up a bit and the mosfets were still at room temperature. the arcs that I got from my FBT were about 3 or 4 inches and teh ignighting distance is about half an inch. and yes I was using 24 volts from two 18Ah SLA for my ZVS driver. I got 2 more 12Ah SLA batteries lying around... so would a 48 volt input for a ZVS driver such a good idea? and what other things can I do to increase the performance of my FBT.
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
If your flyback is heating up, that means you're reaching the limit of your flyback. For more power you could switch to an H-bridge. Shouldn't be that hard to convert what you have to a half-bridge. That will give you more control over the frequency and power.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
If you want the driver to pull more current without raising the voltage, and are not too concerned with efficiency, there is a modification that apparently draws 35% more current. It is another 3+3 winding in parallel with the existing primary with 100 ohms in series with each winding, like this:
But really, if you want more power, i would suggest winding your own AC transformer on a larger U core for maybe 6kvac. Depending on many factors, 2kw would be easy with the driver, though, your capacitor would die. A CDE .68uf 1600v cap would be nice for that, those never even heat up for me.
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how to pump MOAR power to a modern FBT?
