Am 09.08.2012 23:33, schrieb Dimitrios Tsifakis:
Well, that's why I thought the monster IXYS FET I used, which is
obviously an overkill, will probably be hard to kill. I can't possibly
exceed the 55 A current limit (it's fused to much less than that)
However the peak current in the class E is much higher than the average
DC current of the supply/battery. 55A peak current at 12V DC supply
voltage and 100W RF power is not to unrealistic, if the load impedance
is a bit sub-optimal ;-)
What type of IXYS FET do you use?
For a 24V 200W class E is would use a IRFP260N. Just for fun, that one
would be nice too: IRFP4568
Check out that data sheet. May be a bit hard to drive the gate at 137
kHz, maybe to hard for a ICL7667 but a IXDD614 will have no problem at
all.
Sorry, i just like the topic. Of course your concept will work too!
and
I won't exceed the drain (or gate) limits as it's already quite high
(500 V) but also I will add a beefy transzord or zener to ensure
compliance. The capacitors are maybe more likely to get damaged, so
that's something I need to consider by overengineering that part.
In any case, I won't experiment with kites, just good ol' plain earth
antennas which are quite robust mechanically and won't fall on the
ground because they are already there :-)
LOL! That is nice!
Wish you good luck.
73, Stefan/DK7FC
73, Dimitris VK1SV
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