[ARC5] 800 HZ Power: Theoretical Question

[JOHN MCCARTY]

Dave and all;
 Some years ago I had a conversation with a power supply design engineer while waiting in line to hear a talk by Ed Hare from the league.I asked the engineer how I could build an 800Hz power supply for a GP-7 and what kind of transformer I would need. Her answer was "you alreadyhave the transformer, use the one in the rig" and she proceeded to draw out a schematic which sounds like what you were describing. She wroteit out on a sheet of scrap paper.  Now, if I could only find that piece of scrap paper, or better yet, if I could get back in touch with the engineer.
73 and have a great holiday.

John n9hrt


      From: David Stinson <arc5 at ix.netcom.com>
 To: ARC-5 <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net 
 Sent: Friday, November 17, 2017 12:01 PM
 Subject: [ARC5] 800 HZ Power: Theoretical Question
   

Theoretical Question:
Goal: Simple, *quiet* answer to the 800Hz
question.

You begin with an unknown inductance with a 
link-coupled output. (Like transformers).

Drive the inductance with a powerful Class-C 
amplifier, sourcing pulses at freq F.

Make the unknown inductance the PA's "tank,"
introducing tank capacitance to bring the
"tank" into resonance at F, causing the tank to
"ring" and provide a sine-wave output.

Rectify the sine-wave output as a DC power source.


So....
Rectify line AC.  Heavy-Current MOSFET pulses
the GP or TBW power transformers at 800 Hz.
"Tank" capacitor across the transmitter 
primaries resonates and allows the transformers
to "ring."  Ringing transformers output 
the voltage and away we go.

Will it work?

73 OM DE Dave AB5S



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