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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.
Official specifications of the Qi interface standard and the example of the standard in use by a charging pad and the compatible device. The Wireless Power Consortium was established on 17 December 2008. It officially published the Qi interface standard and the low-power specification in August 2010. In October, Nokia joined the WPC. [31]
The first standard for vehicle wireless charging was the SAE J2954 standard. It allows inductive car charging over a pad, with power delivery up to 11 kW. [23] As of 2024, standards for higher-power wireless charging and for charging while driving are being developed. [24]
The proliferation of portable wireless communication devices such as mobile phones, tablet, and laptop computers in recent decades is currently driving the development of mid-range wireless powering and charging technology to eliminate the need for these devices to be tethered to wall plugs during charging. [172]
The A4WP was formed in early 2012 with the intent to create a wireless power transfer standard to compete with the existing Qi standard. Board member companies [ 5 ] included Broadcom , Gill Electronics, Integrated Device Technology (IDT) , [ 6 ] Intel , [ 7 ] [ 8 ] Qualcomm , Samsung Electronics , [ 9 ] Samsung Electro-Mechanics , and WiTricity .
Apple released two chargers using the MagSafe standard in 2020: the MagSafe Charger, which is a single charging pad for iPhone, and the MagSafe Duo Charger, which is a charging mat with both MagSafe and an Apple Watch charger. [2] Apple has also licensed the MagSafe standard to third parties to develop chargers and cases.
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