<s>
SAE	B-Algorithm
J2954	I-Algorithm
is	O
a	O
standard	O
for	O
wireless	B-Application
power	I-Application
transfer	I-Application
(	O
WPT	O
)	O
for	O
electric	O
vehicles	O
led	O
by	O
SAE	O
International	O
.	O
</s>
<s>
The	O
system	O
works	O
along	O
similar	O
principles	O
as	O
inductive	B-Application
charging	I-Application
,	O
but	O
uses	O
the	O
resonant	B-Architecture
inductive	I-Architecture
coupling	I-Architecture
concept	O
with	O
a	O
demonstrated	O
efficiency	O
of	O
around	O
85%	O
.	O
</s>
<s>
Marin	O
Soljačić	O
had	O
been	O
experimenting	O
with	O
resonant	B-Architecture
inductive	I-Architecture
coupling	I-Architecture
systems	O
for	O
some	O
time	O
when	O
he	O
first	O
used	O
the	O
term	O
WiTricity	O
in	O
a	O
2006	O
demonstration	O
where	O
the	O
system	O
was	O
used	O
to	O
send	O
power	O
to	O
a	O
60W	O
light	O
bulb	O
at	O
roughly	O
45%	O
efficiency	O
.	O
</s>
<s>
This	O
work	O
eventually	O
resulted	O
in	O
the	O
formation	O
of	O
the	O
Rezence	B-Algorithm
standard	I-Algorithm
.	O
</s>
<s>
Rezence	B-Algorithm
was	O
officially	O
abandoned	O
by	O
Intel	O
in	O
June	O
2016	O
,	O
and	O
by	O
everyone	O
else	O
in	O
2017	O
when	O
WiTricity	O
announced	O
a	O
round	O
of	O
layoffs	O
and	O
refocussed	O
the	O
company	O
on	O
the	O
electric	O
vehicle	O
(	O
EV	O
)	O
market	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
physical	O
and	O
electrical	O
parts	O
of	O
the	O
system	O
,	O
J2954	O
also	O
standardizes	O
a	O
Bluetooth-based	O
communications	O
standard	O
between	O
the	O
vehicle	O
and	O
charger	O
,	O
methods	O
using	O
triangulation	B-Algorithm
sensors	O
on	O
the	O
car	O
to	O
indicate	O
the	O
proper	O
positioning	O
of	O
the	O
car	O
over	O
the	O
charger	B-Application
pad	I-Application
,	O
the	O
creation	O
of	O
a	O
standardized	O
test	O
stand	O
for	O
vendors	O
to	O
test	O
their	O
vehicle	O
implementations	O
against	O
,	O
and	O
standardized	O
signage	O
to	O
indicate	O
charge	O
points	O
.	O
</s>
<s>
The	O
GA	O
connects	O
to	O
the	O
grid	O
,	O
changing	O
the	O
grid	O
power	O
from	O
alternating	O
current	O
(	O
AC	O
)	O
to	O
direct	O
current	O
(	O
DC	O
)	O
using	O
a	O
conventional	O
rectifier	B-Algorithm
.	O
</s>
<s>
The	O
DC	O
output	O
of	O
the	O
rectifier	B-Algorithm
then	O
drives	O
a	O
power	O
inverter	O
that	O
outputs	O
AC	O
at	O
the	O
desired	O
85kHz	O
frequency	O
.	O
</s>
<s>
The	O
GA	O
also	O
contains	O
a	O
BlueTooth-based	O
communications	O
system	O
that	O
it	O
uses	O
to	O
communicate	O
with	O
the	O
charger	O
on	O
the	O
car	O
to	O
determine	O
maximum	O
rate	O
of	O
charge	O
,	O
charge	O
state	O
,	O
and	O
other	O
information	O
.	O
</s>
<s>
The	O
existing	O
test	O
harness	O
for	O
the	O
GA	O
uses	O
a	O
circular	O
topology	O
for	O
the	O
charging	B-Application
pad	I-Application
,	O
where	O
the	O
induction	O
coil	O
is	O
arranged	O
as	O
a	O
single	O
large	O
spiral	O
.	O
</s>
