From: Harold Hallikainen <harold@mai.hallikainen.org>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sender: "piclist-bounces@mit.edu" <piclist-bounces@mit.edu>
Date: Tue, 4 Feb 2020 11:28:28 -0800
Subject: Re: [EE] Power transmission
Thread-Topic: [EE] Power transmission
Thread-Index: AdXbkwiEU1wWTkh+TI+VXpqTCAZRrg==
Message-ID: <a8604d0c00e9cab4851c28f13bc64a36.squirrel@mai.hallikainen.org>
References: <5E38A14C.8050802@narwani.org>
	<CA+SfAg_RYb8LgpRTkaAPO5xPMp61jNRSikV-ugiZG3TpC5sf7Q@mail.gmail.com>
In-Reply-To:
 <CA+SfAg_RYb8LgpRTkaAPO5xPMp61jNRSikV-ugiZG3TpC5sf7Q@mail.gmail.com>
Reply-To: Microcontroller discussion list - Public. <piclist@mit.edu>
Accept-Language: en-US
X-MS-Exchange-Organization-SenderIdResult: Pass
X-MS-Exchange-Organization-PRD: mit.edu
X-MS-TNEF-Correlator:
received-spf: Pass (protection.outlook.com: domain of mai.hallikainen.org
	designates 208.77.216.252 as permitted sender)
	receiver=protection.outlook.com; client-ip=208.77.216.252;
	helo=mailscanner.virtbiz.com;
dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=mitprod.onmicrosoft.com; s=selector2-mitprod-onmicrosoft-com;
	h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
	bh=ZKP8V6BX0OGark6Kj2XSKzywvQpQk/nTdi1wkFQqxMM=;
	b=CRQ4z42d4Xl5cHHsi1cuqDLMaxJYc7BdZWqcfkT5dp9OH4NrczrHnL8Eeq37WS+aQrilPy75TF6LseJMTOTJH4WRFdrBn4k7QlQzEMKIIX9NqFrNEqqe7GLBAgskknYh37BLE5CjRVUCOgjFA1nOznUCve86R0mXFZW8YYmNSw0=
authentication-results: spf=pass (sender IP is 208.77.216.252)
	smtp.mailfrom=mai.hallikainen.org; mit.edu;	dkim=none (message not signed)
	header.d=none;mit.edu; dmarc=permerror action=none
	header.from=mai.hallikainen.org;compauth=pass reason=111
user-agent: SquirrelMail/1.4.22-5.el6
errors-to: piclist-bounces@mit.edu
list-id: "Microcontroller discussion list - Public." <piclist.mit.edu>
list-post: <mailto:piclist@mit.edu>
x-beenthere: piclist@mit.edu
x-mailman-version: 2.1.6
x-authentication-warning: mai.hallikainen.org: apache set sender to
	harold@mai.hallikainen.org using -f
x-spam-status: No
x-greylist: IP, sender and recipient auto-whitelisted, not delayed by
	milter-greylist-4.6.2 (mailscanner.virtbiz.com	[208.77.216.252]); Tue, 04
 Feb 2020 13:28:30 -0600 (CST)
x-topics: [EE]
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

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 the
> 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 . Thi=
s
> will transfer about 3 watts using a frequency of 250khz  over a distance
> of
> about 1 inch.   Of course you also need a frequency generator with square
> wave output.    The most important part is the coils, the better the q th=
e
> 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.
>>
>>
>> --
>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>> View/change your membership options at
>> http://mailman.mit.edu/mailman/listinfo/piclist
>>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>


--=20
FCC Rules Updated Daily at http://www.hallikainen.com
Not sent from an iPhone.
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.