[ARC5] 800 HZ Power: Theoretical Question

[Peter Gottlieb]

When I have tried this (in other applications) it works nicely at low loads but 
higher loads can cause so much damping that you really don't get so much a 
resonant ring as a really badly distorted wave with lots of harmonic content.

Try it, it may work ok though.

Peter
kb2vtl


On 11/18/2017 6:51 PM, JOHN MCCARTY wrote:
> 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 already
> have the transformer, use the one in the rig" and she proceeded to draw out a 
> schematic which sounds like what you were describing. She wrote
> it 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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