From: RussellMc <apptechnz@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 4 Feb 2020 00:50:27 -0800
Subject: Re: [EE] Power transmission
Thread-Topic: [EE] Power transmission
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Some people will claim that if you use the technology over certain power
levels (5 or 10 Watts?) that they hold patent rights.

I am aware of prior art from 40+ years ago that covers much of the useful
stuff and have demonstrated prior art (and one expired patent) from 20
years ago.



  Russell


On Tue, 4 Feb 2020 at 17:30, Denny Esterline <desterline@gmail.com> wrote:

> Your needs and goals are a bit vague, but I suspect you could start with
> these- in concept at least.
>
>
> https://www.amazon.com/IGOUKJ-Endurable-Interface-Universal-direction/dp/=
B072BSC4G2
> <
> https://www.amazon.com/IGOUKJ-Endurable-Interface-Universal-direction/dp/=
B072BSC4G2/ref=3Dmp_s_a_1_8?keywords=3Dqi+charger+receiver&qid=3D1580790228=
&sr=3D8-8
> >
>
> Available from the typical Far East sources for considerably less.
>
>
> On Monday, February 3, 2020, Neil <picdude3@narwani.org> wrote:
>
> >
> >
> > On 2/3/2020 8:31 PM, RussellMc wrote:
> > > How much power?
> > Not sure yet.  I'm more tinkering at this point.  But let's say ~ 1 wat=
t
> > for now.
> >
> > > What distance between TX:RX?
> > I have a very small gap directly behind the 1/2" MDF panel, but if I ca=
n
> > place the transmitter on the back of the wall, I'd have a LOT more spac=
e
> > for the transmission coil.  That would be 6" or more away.
> >
> > > What limitations on dimensions of send and receive units?
> > Receive would have to be considerably smaller, but I can have several
> > (maybe 10-20) receivers.
> >
> > > Any cost factors?
> > Cost is always a factor -- I'd prefer not to spend a grand on this :)
> >
> > > Why is a hole unacceptable?
> > This is an idea for a artwork that will change periodically.
> >
> > > What are the materials used at and near the power transmission site?
> (eg
> > > are the wall panels made of mumetal?, ...? )
> > Walls are drywall (open space in-between), though one may even be
> > plaster on cinder block.
> >
> > > Any other relevant stuff?
> > I'm really just tinkering with the idea right now and thought I'd learn
> > about it.  I'm very clueless about what frequencies would be better
> > (distance-wise).
> >
> > Cheers,
> > -Neil.
> >
> >
> > >
> > >
> > >
> > >             Russell
> > >
> > >
> > > On Tue, 4 Feb 2020 at 11:43, 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 ide=
a,
> > >> 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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