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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
You know those ferrite cored in line filter things you find in TV's, SMPS, and other devices? (pic below for reference)
I was curious if that would work as a fly-back since it's already pre-made with a decent number of turns.
The only concern I have with it, is that since it's designed as a filter, each winding is the same number. But, since it's going to be ran in fly-back mode, would that matter at all? I have some pretty good sized ones and was contemplating using one of them to charge my cap bank!
you need 1 to N ratio for a flyback...where N is a rather large number, so 1 to 1 is not too good.
For example, if you make a flyback transformer with 1 to 1 ratio, and somehow manage to get 10Kv on the sec, you also get 10Kv (or more) on the primary, and whatever mosfet you will use it won't be happy.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
The parts you pictured are more specifically called "common mode chokes". That site also has an informative page called flybacks, presenting both the transformer form (not truly a transformer) and the inductor form (more commonly called a boost converter).
As others have mentioned, the ferrite core material may be deliberately lossy.
Aside from that, you could make a flyback converter. With 1:1 ratio, the primary voltage would go as high as the output voltage when the switch opens.
But if you don't need galvanic isolation, you might as well make a boost converter. Could connect the two windings in series or parallel (with appropriate phasing) to get 4x the inductance, or same inductance @ twice the current. [edit] For that matter, how 'bout a 1:2 autotransformer, so the primary switching transistor only needs to withstand half of the output voltage?
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
I had a ZVS driver premade just for driving fly backs, when i connected it to my homemade transformer it took about 30 sec to charge a 3600uf cap bank.
I built a new one especially for the coil gun using a tank cap of 4 uf which make the caps charge in 6 seconds :D
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In-line filter =? flyback converter?
