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Registered Member #3282
Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224
i saw a flyback one time in a book or magazine that had one turn primary. Would this at all work? I am think a IGBT running at 1khz with 50uf cap+ 800v primary
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I have used one turn primaries before for small power supplies. as long as you do the math your fine, remember volts per turn, and average out equal volt-seconds in positive and negative displacement, otherwise youll walk towards saturation.
look here:
In your example, you wont get anywhere near 800 volts per turn. maybe 8 to 30 volts per turn. and you wont even get that high at 1kHz, (youll need at least 50-75kHz as im guessing or much more).
i have a special ferrite planar transformer im developing right now, im hoping for 11 volts per turn, with one or two turns on the primary. ( therefore my primary voltage will be 11 or 5.5 volts.)
Two things ive learned, first you need as wide a cross section of ferite as you can get. second, you need a relativly high freq of switching. both of these tend to drive you toward a higher volt per turn value.
Though it is probably a feedback winding, or a heater winding for the CRT elements, and thus not a real primary.
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one turn primary
