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Re: [RFI] Wireless Power Transfer with electric vehicles

To: rfi <rfi@contesting.com>
Subject: Re: [RFI] Wireless Power Transfer with electric vehicles
From: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
Date: Mon, 12 Apr 2021 15:17:08 +0000
List-post: <mailto:rfi@contesting.com>
The figure of 50% does not agree with what I have seen reported. If it were 
only 50%, the radiated field on the fundamental would be way over any limits 
and/or 10 kW of heat would be dissipated locally from a 20 kW charger.  The 
little Qi chargers are not very efficient, but the WPT-EV systems must be 
efficient or they'd get very, very hot.

https://chrismi.sdsu.edu/publications/090.pdf


-----Original Message-----
From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> On Behalf Of Rob Atkinson
Sent: Sunday, April 11, 2021 6:48 PM
To: rfi <rfi@contesting.com>
Subject: Re: [RFI] Wireless Power Transfer with electric vehicles

The people who buy electric cars to Save The World are blissfully ignorant of 
all the pollution associated with making and recycling batteries.  They will 
also be blissfully ignorant of the fact that wireless charging energy transfer 
is about 50% efficient compared to a direct cable connection.  Some won't 
care--they only want to virtue signal with their cars and have plenty of money 
to waste.  But maybe enough will avoid this idiocy IF they find out how 
expensive it will be.

73

Rob
K5UJ
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