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"My only concern is that it wouldn't work, which I see as a problem."
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There are different wireless chargers for different devices;
the user must determine which to use. How about if the
machine itself decided?
The charger's brain would query the device, learn its identity
and battery parameters along with what percentage of
charge it currently had, and ramp
the charging parameters
up/down to fit the device.
"Ahh, you are an Android S5 (iPhone, iPad, Chromebook, etc)
with the standard battery that is down to 35%. I shall charge
you with 1 (2, 3, 99, etc) amps of wireless magic. Here we
Switcheroo Power Supply
As mentioned in an annotation. [Vernon, Dec 14 2015]
||Wireless chargers necessarily use induction, not horribly
unlike how an ordinary transformer uses induction.
Therefore a key fact relates to the "number of turns" in
each of two induction-linked coils. Inside a
transformer, the ratio of the two numbers-of-turns in
the two different coils determines the degree to which
voltage and amperage are adjusted (the output of the
transformer is usually different from the input). If the
turn-ratio is 2:1 then the voltage can be doubled or
halved (and vice-versa for the amperage), depending
on if it is the input coil or the output coil that has twice
as many turns.
||For this Idea to work, the wireless charger coil needs to
have an adjustable number of turns. The query would
want to ask how many turns are in the device that
would be charged, as well as what voltage was
expected. Only then would the charger be able to
determine how many turns of its charging-coil to
activate. (For notions regarding one way to activate
varying numbers of circuits --and each coil-turn could
be considered one circuit-- see an Idea I posted several
years ago, "Switcheroo Power Supply".)
||Note that what you wrote about amperage is not going
to be easy to implement. Normally when voltage is
adjusted upward by a transformer, available amperage
goes down. Amperage can go up when the voltage goes
down, but there is a limit, because if the voltage is too
low, internal resistances of circuits can basically
prevent current (amps) from flowing hardly at all.
||Welcome to the HB, [whatrock]!
||There is some pushback against communication between
the charger and chargee, for security reasons. "USB
condoms" are available to prevent the loading of viruses on
your phone by malicious public chargers. This would need
some kind of way to prevent the transmission of malware
from charger to chargee. It could be as simple as a very
limited protocol that only allows a single message specifying