Roots of Class E (maybe)

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Roots of Class E (maybe)

Postby N9NEO » Thu Aug 14, 2003 6:46 pm

The Class E concept is similar to whats done with old-time ferroresonant UPS systems. An inductor is resanant with capacitor and a couple of switches running at 60Hz.

I recall submarines were using this technology in early 1970s to get AC from battery power. Probably SCRs with forced commutation.

73
Bob
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Class E

Postby frank carcia » Wed Aug 20, 2003 11:34 am

Bob,
I agree and was surprised the same way. I learned about resonant back in the days of Unitrode seminars. I thought about it back in my early FET transmitter days of the late '80s. I had 4 IRF250 in push pull parallel making 100 watts of carrier on 75 running quite hot if you can imagine
those old pigs going that fast. I did class D or switch mode as the O.T.
call it. When I got the efficiency up to 90 % in the present rig built in '96
I thought I was in resonant mode. Later learned the name was changed to class e. fc
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