SAE International has published SAE J2954 Recommended Practice (RP), providing the first worldwide specification for wireless power transfer for electric vehicles up to 11 kW power levels (WPT3). SAE J2954 RP establishes industry-wide specification that defines acceptable criteria for interoperability, electromagnetic compatibility, EMG, miniumum performance, safety and testing for wireless charging of light duty electric and plug-in electric vehicles.
“The current version addresses unidirectional charging, from grid to vehicle, but bidirectional energy transfer may be evaluated for a future standard. The specification defines various charging levels that are based on the levels defined for SAE J1772 conductive AC charge levels 1, 2, and 3 with some variations. A standard for wireless power transfer (WPT) based on these charge levels will enable selection of a charging rate based on vehicle requirements, thus allowing for better vehicle packaging, and ease of customer use. The specification supports home (private) charging and public wireless charging.
In the near term, vehicles that are capable to be charged wirelessly under Recommended Practice should also be able to be charged by SAE J1772 plug in chargers.
This Recommended Practice is planned to be standardized after the 2018 timeframe after receiving vehicle data. The contents, including frequency, parameters, specifications, procedures and other contents of this Recommended Practice are to be re-evaluated at that time to allow for additional developments and future innovations.”
Source: SAE International