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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
This inductor (I'll call it Ldc, dc inductor) in a textbook 'ideal' situation would have such high inductance that the ac ripple current in the inductor (due to the waveform at the primary resonant inductor center tap) is negligible compared to the dc current.
This is why the 'proper' name for a zvs/Mazzilli etc. is Current Fed Parallel Resonant CFPR
A practical Ldc would have to pass the peak current without satuating or overheating Generally the dc current heats the wire and the ac curent heats the core and the wire For 10's to 100's of kHz iron powder or gapped ferrite is required. (or air)
As the Ldc inductance is decreased (lower value OR due to saturation) then the CFPR oscillator moves towards becoming a blocking oscillator, which may give more output but heat the core(s) too much.
Registered Member #2416
Joined: Sun Oct 04 2009, 04:23AM
Location: Oceanside, CA
Posts: 91
Tritium, I've had good success with a 1in diameter ferrite core wound with 20 turns of 2 strands of 24 gauge magnet wire. I used two strands simply because I didn't have anything thicker.
Although since you're using 4 turns on your primary instead of 10 you may have to try a different number of turns to get ideal operation. I believe that, within limits, the more inductance the higher the output voltage will be at the expense of current and visa versa.
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"inductor coil" mazzilli driver
