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Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
Look at the data sheet for those FET's. You need one with a 200v rating or so, and a lowish Rds(on) maybe 0.25 ohms or so would be good. If you use a halfbridge as the diagram indicates, then each switch should be rated for the full supply voltage plus a safty margin. If you rectify mains you will end up with about 170v. The fets you selected are rated at 200v so they should work. I should note that this is safty margin of 30v is too small for my liking, but the original fets that Steve specified are also 200v rated, so I don't expect you to have any problems.
So short answer is yes, those fets will work fine.
As for your secondary, you should aim for a resonant frequency of 500khz or lower I would say. The smaller your coil, the faster it will need to switch, and the more stress your fets and driver circuit will see. I would wind for about 12 inches on a 3" diameter PVC pipe. I have a secondary like that here and it resonates at about 350khz with a medium topload.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
A lot of people have made steves half bridge SSTC including myself, I would always blow up those caps but mostly due to bad circuit layout on my end and pushing the FEts too hard, as well as noise introduced into the signal causing shoot threw.
As for the secondary I've always followed the guideline that your coil should have approx 1000turns and that you should have a height to width ration of 3-5:1 depending on how big your coil is for small ones I believe its 3:1 so that for 1inch in diameter you need 3inchs of height and to try and shoot for 1000 turns, also depending on how large of arcs you are looking to make select your wire gauge or diameter accordingly the small the diameter the more turn you can fit on the secondary but you loose efficiency due to the resistance of the wire and more then likely heating of the secondary which will increase the chances that the coil self destructs by means of arc over or flash over either along the length of the coil or arcing to the primary.
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can i use these fets on sstc
