[ARC5] 800 HZ Power: Theoretical Question

[Peter Gottlieb]

Perhaps a single phase variable frequency motor drive might work? Plenty can be 
set to 800 Hz, I have some that go to 1200 Hz.  The power levels available are 
as much as you want.  If you can't find single phase input you can get a 3 phase 
input and just use one phase (it just rectifies it) and over-size the drive a 
bunch, like 3x.

Peter
kb2vtl


On 11/18/2017 7:26 PM, J Mcvey via ARC5 wrote:
> 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..
>
> Jim
> AC2EU
>
>
> 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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