[RFI] Wireless Power Transfer with electric vehicles

[Tom Thompson]

I looked at the video and 6:50 into it there is a proposed schematic 
that has a classic switch mode power supply circuit.  At 21 kW, that is 
really going to create a lot of RFI unless they do a great deal of 
filtering.

Tom   W0IVJ

On 4/11/2021 9:58 AM, Michael Aust via RFI wrote:
> Here a technical discussion on these
> Wireless RF chargers that will destroy
> HF for city dwellers for sure !
>
> https://m.youtube.com/watch?v=iOVg62_DUYU
>
> Mike
> WB6DJI
>
> Sent from my iPhone
>
>> On Apr 11, 2021, at 8:52 AM, Michael Aust <wb6dji_dx at icloud.com> wrote:
>>
>> These RF chargers like the Qi for iPhones is being proposed as Automobile RF Chargers for Hybrid cars now and are basically RF oscillators generating Lots of RF in the HF Bands
>>
>> 20kW RF oscillators!!!!
>>
>> https://m.youtube.com/watch?v=CEGlmQS692w
>> Qi RF Charger
>>
>> This Will destroy the HF HamBands
>>
>> Mike
>> WB6DJI
>>
>>
>> Sent from my iPhone
>>
>>>> On Apr 10, 2021, at 4:28 PM, James Gordon Beattie Jr <w2ttt at att.net> wrote:
>>>>
>>> Ed,
>>> The bottom line question will be whether in a housing sibdivision with homes  with two EV chargers each, can they peacefully coexist with low profile HF/VHF/UHF antennas in attics, around gutters and on flag poles?
>>>
>>> The pressures of domestic electronics technology and HOAs and deed/convenant-restricted communities are at crossed purposes with respect to Amateur Radio.
>>>
>>> 73,
>>> Gordon Beattie, W2TTT
>>> 201.314.6964
>>>
>>> Get Outlook for Android<https://aka.ms/ghei36>
>>>
>>> ________________________________
>>> From: RFI <rfi-bounces+w2ttt=att.net at contesting.com> on behalf of Hare, Ed, W1RFI <w1rfi at arrl.org>
>>> Sent: Saturday, April 10, 2021 3:21:20 PM
>>> To: jim at audiosystemsgroup.com <jim at audiosystemsgroup.com>; rfi at contesting.com <rfi at contesting.com>
>>> Subject: [RFI] Wireless Power Transfer with electric vehicles
>>>
>>> Oh, it's worse than the little Qi chargers, Jim.  We are talking 20kW chargers for electric vehicles and ARRL and IARU are very concerned about harmonics and inverter noise.  Right now, they are using magnetic loops, which are resonant, but also need filtering,, which at the 20 kW level Is not trivial.  The key is to get the right limits set.  ARRL has been helping to revise a few industry position papers, and although we don't always see eye to eye, we are making a difference and, more important, planning ongoing work.  Much like BPL, the goal is not to stop technology, but to help identify proper EMC solutions. With BPL, HomePlug  did it and HomePlug devices deployed successfully by the millions.
>>>
>>> Today, I am in the Lab, gathering the wiring and adapters I need to finish the installation of  1.5m loop and active whip on a trailer to tow behind my van, to get away from vehicle noise. I am headed out to two large solar farms in Connecticut, just to get a feel for the EMI that may be present near them locally.
>>>
>>> I get to have all this fun on weekends sometimes, too!
>>>
>>> -----Original Message-----
>>> From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> On Behalf Of Jim Brown
>>> Sent: Saturday, April 10, 2021 3:14 PM
>>> To: rfi at contesting.com
>>> Subject: Re: [RFI] Ed Hare W1RFI Contact Info?
>>>
>>>> On 4/10/2021 11:58 AM, Hare, Ed, W1RFI wrote:
>>>> I have three major issues come up with wireless power transfer,
>>> Great to hear that you're engaged on this, Ed. My RFI alarm went off years ago when I heard the first rumblings about this for use in charging widely used consumer devices.
>>>
>>> 73, Jim K9YC
>>> _______________________________________________
>>> RFI mailing list
>>> RFI at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>>> _______________________________________________
>>> RFI mailing list
>>> RFI at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>>> _______________________________________________
>>> RFI mailing list
>>> RFI at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi