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Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
This 13.56MHz coil works a little better when raised off the groundplane by these ingenious soldered stands.
The coil breakout is totally silent (well, if I put enough smoothing caps on the supply), and is stiller than a blowtorch flame (so I wonder if the AM seen on the scope was just 50Hz ripple when I didn't have enough caps on the drain supply).
I found that if I grounded the baseplate, I couldn't get the coil to form any breakout at all. These pics showed it at about as big as I could achieve (20mm in the longest image) at 60Vin 1.5A; there was no shielding, and the drive was fixed frequency.
The IXDD414 is driving a single STP5NK50Z (500V, 4.4A, 75pF output capacitance) MOSFET through a 1:1 gate-driver transformer. The gatedrive resonates quite neatly between 13.4 and 13.8MHz, and its amplitude can then be adjusted (somewhat) by reducing the duty cycle into the IXDD414.
The last image shows the output waveform when I tune the setup for maximum power instead of maximum efficiency.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
wow!
That is pretty sweet
Are there still plans to get it running self resonant and then audiomodding it? I think that regardless you should take a day to box this one up so that you have a working coil arround ;)
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
This one officially goes in the "too hard" basket. I can't get a satisfactory amount of power through, and it's just a little too unstable. He'll run indefinitely with the particular MOSFET, as there's very little heating, but it's still too touchy, too sensitive. As I mentioned, it's even impossible to get breakout if I so much as just ground the groundplane (yes, even re-sweeping the resonant frequency, etc)
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13.56MHz CW coil, 250W target, class-E drive topology
