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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Soft switching helps them turn off.
With hard drivechips won't make more than 4-5Mhz with little load, and waveform would look gross anyway so it's better to turn it into real sine, while class E amp doesn't care about it much.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Hi WaveRider, Steve, feeding them with 12V each, and input signals exactly 180 degrees out of phase (I found this quite tricky at 12MHz ) that's the output you see there...
Matching it into a FET is proving tricky, but I'm working on it
Edit: re gatedrivers link, been there before, but thanks anyway, the other guys will benefit =-D
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
O_O because internal losses due to charging and discharging the device's own capacitance (what makes the device "Die unloaded" I guess) increase as the square of the supply voltage.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Thought i'd dig up this thread instead of starting a new one, or pulling the HF gate drive off topic too much...
I suppose I can now claim to owning a 12Mhz sstc, because I've managed to light tubes.
Interesting thing is, I am base feeding the secondary with only 13.8 volts into the final class-e stage - yet managing to get a fairly strong electric field, but no sparks (can't even draw sparks, it's equivalent to just shorting the load out).
To make it work requires a heck of a topload, for plenty of capacitive coupling from the topload to the copper board below (which is connected to the source of the fet / ground). I'm not sure it can be classed as a true tesla coil, because there seem to be 2 high voltage nodes - on the 'ground' and on the topload. More like just a series LC circuit connected between the source and drain, with a 'less obvious' capacitor. I can't figure out how to ground it properly, because it's impossible to ground the resonator
Anyway I was quite impressed with what it could do, didn't expect it to do anything!
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
yeah I'm going to have to give in and use a primary on this coil...
It's also nowhere near class-e operation so i'm jumping the gun a bit by saying I have a working coil, that's just me. The mosfet is overheating big time, so I don't think I'll turn up the volts yet.
I'll eventually get base feeding to work properly, one day...
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smaller coils (and a 12MHz target)
) that's the output you see there...
