SAE J2954
SAE J2954 is a standard for wireless power transfer (WPT) for electric vehicles led by SAE International. It defines three classes of charging speed, WPT 1, 2 and 3, at a maximum of 3.7 kW, 7.7 kW and 11 kW, respectively. This makes it comparable to medium-speed wired charging standards like the common SAE J1772 system. A much more powerful WPT9 is being defined in J2954/2 for 500 kW charging for heavy-duty vehicles which have the room necessary to mount the larger induction plate.

The system works along similar principles as inductive charging, but uses the resonant inductive coupling concept with a demonstrated efficiency of around 85%. This makes it similar to wired chargers, where the higher theoretical efficiency is offset somewhat by necessary isolation systems that prevent high-current back-feeding, systems that the air-gapped J2954 does not require. Best-in-class medium-speed chargers are around 94%.

Development of the underlying resonance transfer concept was developed by Marin Soljačić at the Massachusetts Institute of Technology (MIT) and then spun-off as WiTricity in 2007. WiTricity has led the SAE standardization efforts, which began in 2012 and have undergone two Recommended Practice releases . The final standard was published in 2020. WiTricity predicts that J2954 chargers will be available as add-on features beginning around 2022.
Q6856398
wireless power transfer
UNK
Q13629441
electric vehicles
Concept
Q1427072
SAE International
ORG
Q2204743
SAE J1772
LOC
Q2611270
inductive charging
Concept
Q4118065
resonant inductive coupling
UNK
Q1861667
Marin Soljačić
PER
Q49108
Massachusetts Institute of Technology
ORG
Q1186164
spun-off
Concept
Q430777
WiTricity
ORG
Q85851809
SAE J2954
UNK
2007-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2007
DATE
2012-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2012
DATE
2020-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2020
DATE
2022-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2022
DATE
+2954^^http://www.w3.org/2001/XMLSchema#decimal
2954
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+3.7^^http://www.w3.org/2001/XMLSchema#decimal
3.7
NUMBER
+7.7^^http://www.w3.org/2001/XMLSchema#decimal
7.7
NUMBER
+11^^http://www.w3.org/2001/XMLSchema#decimal
11
NUMBER
+1772^^http://www.w3.org/2001/XMLSchema#decimal
1772
NUMBER
+9^^http://www.w3.org/2001/XMLSchema#decimal
9
NUMBER
+2954^^http://www.w3.org/2001/XMLSchema#decimal
2954
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+85^^http://www.w3.org/2001/XMLSchema#decimal
85
NUMBER
+2954^^http://www.w3.org/2001/XMLSchema#decimal
2954
NUMBER
+94^^http://www.w3.org/2001/XMLSchema#decimal
94
NUMBER
+2954^^http://www.w3.org/2001/XMLSchema#decimal
2954
NUMBER
employer
founded by