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Date: Tue, 4 Feb 2020 12:01:06 -0800
Subject: Re: [EE] Power transmission
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A high q resonant circuit should help

On Tue, Feb 4, 2020, 12:32 PM Harold Hallikainen <harold@mai.hallikainen.or=
g>
wrote:

> I wonder about radio interference with several watts of 250 kHz square
> wave. One nice thing about the Linear Technology designs (at Analog
> Devices) is that they comply with EMC requirements.
>
> Harold
>
> > If you want to set up something simple for a test you need a mosfet
> > driver,
> > a coil of 20awg or so wire, about 30 turns in a coil about 3 inches
> > across,
> > a coil with about 200uh , a 200pf cap and a schottky diode.  That is th=
e
> > sending parts and the receiving part is a coil as close to the first 30
> > turn coil in size and shape.  I can post more details if interested .
> This
> > will transfer about 3 watts using a frequency of 250khz  over a distanc=
e
> > of
> > about 1 inch.   Of course you also need a frequency generator with squa=
re
> > wave output.    The most important part is the coils, the better the q
> the
> > more efficient it will be.
> >
> >
> > On Mon, Feb 3, 2020, 5:44 PM Neil <picdude3@narwani.org> wrote:
> >
> >> I'm tinkering with power transmission for getting power from behind a
> >> wall panel to in front.  For now I'm just experimenting with the idea,
> >> but I can't find much info on the relationship between coil diameter,
> >> wire diameter, number of turns, frequency, and distance.
> >> Anyone here know anything about this?
> >>
> >> Cheers,
> >> -Neil.
> >>
> >>
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