[ARC5] 800 HZ Power: Theoretical Question

[J Mcvey]

I'm jumping in the middle of this without even knowing what a GP-7 is/was.I looked it up and it's  monster transmitter that was designed to run on 800Hz power!
There are a few options depending on the config of the primary and what was the driving voltage supposed to be?Yes, you  could drive it with some big mosfets with gate drivers . There are various kinds of cookbook IC's for power supplies and motor controllers that could be used to do this. It all depends on how much wattage you need to push.

I've made mini versions of this for replacing the old vibrators that ran at 110 to 125 HZ in mobile equipment. The power requirements were modest, so all it needed was a CMOS multivibrator and two mosfets to do the job.TSince it's  square wave, the mosfets didn't even need a heat sink !Unfortunately, your application is going to require more "BEEFY" stuff to push the power you need.. 
 
JimAC2EU
 

    On Friday, November 17, 2017, 1:20:48 PM EST, David Stinson <arc5 at ix.netcom.com> wrote:  
 
 
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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