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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Here are the latest plots we took this morning of the IRF520 driver stage. Looks good now and the IRF520 isn't even warm to touch when driving the high power stage.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
blackplasma wrote ...
If you can get it all tuned nicely, the IRF520 will allow for 24V supply with a little overhead. Mmm, portable.
Did I tell you about my idea for plasma-speaker earbud-headphones? =P
As I figured out for now this shown circuit is a driver for another high-power mosfet in class E. CIrcuit seems to closely resemble richieburnett's class E coil.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Having some more fun with the coil this morning. Got the final power stage running and have a weird problem . . . Seems the drain waveform looks class E, but is only turning off every other waveform, even though the gate looks pretty solid.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
You'll find just changing the frequency minutely may be sufficient to fix this.
IIRC you may need to _increase_ the frequency to rectify this... and if that's going to fix it, you'll find a sweet/sensitive spot at which you get the correct count of peaks appearing.
Try adding a little more(--?) capacitance to the shunt, whilst also twiddling that frequency ever so slightly. Try lowering the coupling a little, too.
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Class E Troubles
lol
