Wireless Power Transfer (WPT) is presently being applied to consumer electronics in the low-power range and is planned to be commercialized in the high-power range for plug-in and electric vehicles in 2018. There are, however, many technology challenges remaining before widespread implementation of high-power WPT will occur. The SAE Vehicle Wireless Power and Alignment Taskforce published the Technical Information Report J2954 in 2016 to help harmonize the first phase of high-power WPT technology development. SAE J2954 adopts a performance-based approach to standardizing WPT by specifying ground and assembly coils to be used in a test stand (per Z-class) to validate performance, interoperability and safety. The main goal of this SAE J2954 bench testing campaign was to prove interoperability between WPT systems utilizing different coil magnetic topologies for SAE TIR J2954. The main challenge is that this type of testing had not been done before on such a scale with real automaker and supplier systems. A number of automakers, suppliers and government employees worked together to create a test plan, perform the testing and analyze the results. To evaluate the interoperability, performance, and EMC & EMF of this technology, a bench test program was created based on the SAE J2954 TIR, supported by the SAE WPT Taskforce along with the US Department of Energy's Idaho National Lab and TDK North America. The tests were conducted across two different power classes (between 3.7 kW to 7.7kW) and two different coil magnetic topologies (circular and double-D). This report describes the testing program and contains results from the different WPT systems. This testing validates the first stage of SAE J2954 standardization and proves that WPT is not only possible over an air gap of 250mm, but also interoperable over power classes and system designs with high efficiencies (many tests were above 90% AC to DC efficiency). The results of this report is being used as a basis for the Recommended Practice J2954 which is to be published in 2017.

This paper presents a study of the influencing factors on magnetic leakage field of a 7 kW wireless electric vehicle charging (WEVC) system. The leakage field was measured in different test configurations and environments which afterwards were used to validate simulation models. The impact on magnetic leakage field distribution when varying the test environment and the test setup is presented in this paper. These results will be used to support discussion and recommendation in standards bodies related to the measurement of the magnetic leakage field of WEVC systems.

This paper discusses requirements and potential solutions for interoperable wireless charging systems for electric and plugin hybrid vehicles. Such technology is known as resonant magnetic induction charging, also referred to as wireless electric vehicle charging (WEVC). Future requirements for a WEVC system are: low cost, small package, high power transfer and interoperability. This paper discusses interoperability requirements as a key factor for successful deployment of WEVC systems. One key aspect analyzed in this paper is primary and secondary coils requirements as they relate to interoperability. Theoretical and practical studies have been conducted and a suggested interoperable solution is presented.

This paper discusses requirements and potential solutions for interoperable wireless charging systems for electric and plugin hybrid vehicles. Such technology is known as resonant magnetic induction charging, also referred to as wireless electric vehicle charging (WEVC). Future requirements for a WEVC system are: low cost, small package, high power transfer and interoperability. This paper discusses interoperability requirements as a key factor for successful deployment of WEVC systems. One key aspect analyzed in this paper is primary and secondary coils requirements as they relate to interoperability. Theoretical and practical studies have been conducted and a suggested interoperable solution is presented.

Contactless energy transfer between power supply and electric vehicle as described in this proposal is based on the principle of resonant inductive coupling. A pair of charging pads, the stationary charging pad and the mobile charging pad, is used for this purpose. A charging pad may incorporate one or more coils and may be underlaid with material that is capable of conducting the magnetic field. As the stationary charging pad and the inverter are combined to form a unit within the stationary part (though they may be arranged at separate locations), no publicly accessible interfaces are required. The stationary part may be embedded in the ground and mounted flush with the road surface, or it may rest on the ground, e.g., for mounting in a garage. The inverter serves to convert the supply voltage and to set the frequency, current and voltage for the magnetic coil(s) of the stationary charging pad. In addition to the mobile charging pad, the mobile part of the charging equipment incorporates the on-board electronics.