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Registered Member #2721
Joined: Fri Mar 05 2010, 04:09PM
Location: Guadalajara, Jalisco
Posts: 28
ezis, i have seen schematics when this is fed from rectified mains, what would be the top voltage to use with these zeners, or is there a way to use other type of regulation on the gates, mabe a separate psu ? thanks
Registered Member #2721
Joined: Fri Mar 05 2010, 04:09PM
Location: Guadalajara, Jalisco
Posts: 28
Hello, Hey, today i fried 2 more mosfets, this time i purchased an osciloscope to monitor the gate signal and a freq meter to see check the output freq, i noticed that signal peaks at about 25v so guess this is bad, however it worked quite nice at around 30khz, trying to increase frequency i changed the capacitor to a lower value and while frequency went up to 39khz, i noticed some oscilations at the gate when voltage almost come to zero, changed capacitors again, and this time the gate drop ocilations where much larger in time and amplitude, and circuit inmediately died before i could measure freq.
Registered Member #2721
Joined: Fri Mar 05 2010, 04:09PM
Location: Guadalajara, Jalisco
Posts: 28
Yes, IRFP450, but they dont get hot, zener unregulated V=45V and gate input (after zener) 25v Peak i just got two NTE2943 Rdson 0.077ohm but mag DtS 100v
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Ed, just use your working ZVS driver. Wind the 10 center tapped turns on one side of a large (if possible) LOPT core, and on the other side try different secondaries. Use around 12 gauge. Try 5 first, then just experiment. Mess with the work coil, try 3-10 or whatever.
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ZVS driver help! 24v 50A psu zenners ????
