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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
If I were you go about 4 to 6 turns for each primary and connect the main resonant cap as close to the transformer as possible. Maybe a larger gauge than you are using say 16 or 14. The cap and primary are supposed to form a parallel resonant tank circuit at the frequency of the secondary. To tune it try different values of caps .6 to 2uf. The cap should be a polypropylene, and low ESR, for best performance.
Registered Member #2838
Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Try 5+5 turns for the primary and 3+3 turns for the feedback as seen in this schematic. It works vary well. If you cannot fit all of the turns try a smaller gauge wire. A fairly thick magnet wire (enameled wire) should work find. It will allow you to use a larger gauge wire with less room needed due to the insulation. You will also need to add two 2W or better 100 ohm resistors for the feedback. I would also recommend bumping up the power supply to 24-36V. I do not recommend much higher than that if you would like your flyback to last vary long.
Registered Member #2871
Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81
I have a question!I think to order a toroid inductor or core but i dont know what...First of all what is better ferrite or iron core?Also i see on ebay that all toroid inductors with 47-200uH aren't appropriate for 10A..So what colour of core must i order and with what wire i must wire it to achieve a 10A inductor!And if you know any way to make a appropriate inductor for my circuit let me know!
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
I am not shure wether to use ferite or iron powder core I just found a choke that I had laying around. I didn't even mesure it. I am shure it maters but I don't know what the answer is but if i were to make a choice it would be iron because of its use in chokes. hear is my a picture of what i used
Registered Member #2871
Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81
I have 5 flyback so i think to use them in series/paralell to get a good voltage/current output!Can i connect them driven by the same zvs driver?They will give me good results?Also i think to use one ferrite core of one of my flybacks to make a homemade flyback...With a homemade i will take better results than the original one?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
if you use 5 flybacks thay have to be identical for parallel use. each flyback has its own resonant frequency and step up ratio. In my picture I have 2 in parallel sets 180 deg out of phase. see how close the main cap is, about 2.5uf. The cap should be a poly type cap with low ESR, with other caps you may not be able build the large cirulating currents needed to produce those large outputs. I built one mazillii that had 40kv sparks then the secondary arced. Try one flyback that you can spare and slowly add primary caps once it it is working. if it does not up imediatly swich the wires going to the gates of the fets
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first zvs/mazilli driver!Help!
