1. JASIC Status of Standardization Activities on
Wireless Power Transfer (WPT) Systems
for Electric Vehicles
JASIC

2. About Wireless Power Transfer (WPT) for EVs
WPT Systems for EV charging is a nascent technology and still under development.
Currently WPT system up to 11.1 kW utilizing the magnetic field (MF-WPT) is being developed and standardized for passenger cars and light duty cars.
A coil which captures the magnetic field generated by the supply side coil on the ground is installed underneath the vehicle. No physical connection by cables or wire harnesses between the vehicle side and the power supply side exists.
The generation of the magnetic field is controlled by the supply side equipment upon the request from the EV through Wi-Fi communication. The EV monitors the status of the received electric power (current and voltage) and feeds back the information to the supply side.
Supply side coil
EV side coil
Power Circuit
REESS
Power circuit
Power supply network (Grid)

3. Safety requirements for EV with WPT system
The requirements for electrical safety and REESS safety from the vehicle prospective would be almost same as existing ones. Since there is no physical connection between the power supply side and the vehicle, no specific requirements during charging are necessary. (Even the connection of the vehicle chassis to the ground during charging is not required.)
On the other hand, the specific requirements due to the magnetic field for power transfer such as the protection against thermal incidents (burn and/or fire of foreign objects), the protection of human against electric magnetic field, electric magnetic compatibility, etc., need to be developed, mainly as the functions of the power supply equipment side, but together with the vehicle side.
Another important issue for the promotion of WPT is the interoperability between the power supply side and the vehicle side. Since they might be produced by different manufactures, the standardized WPT system for ensuring the interoperability is essential.

4. Standardization Activity
Projects for standardization of WPT systems started already some years ago.
ISO/TC22/SC37/JPT19363 is developing ISO with close cooperation with IEC/TC69/WG7 who is developing IEC series. These standards covers the safety and interoperability requirements.
For the vehicle side, ISO PAS that cover the requirements for the MF-WPT system was published as the first step in January 2017.
ISO is now working on the development of the IS based on the this PAS. Targeting of the publication is by the end of 2019.
For the power supply side, IEC , which covers the general requirement for WPT for EVs for the supply side, was published as IS in July 2015.
IEC TS that defines the requirement for the communication for controlling WPT, and IEC TS that covers the specific requirements for the WPT utilizing the magnetic field, are about to be published as the first step.
IEC is going to develop the International Standards based on those TSs immediately after finalizing them, targeting the publication also by the end of 2019.
NOTE: In US, SAE J2954 TF is also developing the SAE standard. SAE J2954TF has published the SAE TIR J2954 in May 2016, followed by the publication of the SAE RP J2954 in November SAE J2954 TF is now working on the development of IS based on this document.
ISO, IEC and SAE are working with close cooperation for harmonization.
Remark　　PAS: Publically Available Specification, TS: Technical Specifications , IS: International Standard
TIR: Technical Information Report, RP: Recommended Practice

5. Major Standards for WPT for EV
Title
Publication
/Revision
Committee
International
ISO 19363
Electrically propelled road vehicles – Magnetic field wireless power transfer – Safety and interoperability requirements
2017/1 (PAS)
2019/9 (IS)
ISO/TC22/
SC37
IEC
Electric vehicle wireless power transfer (WPT) systems
- Part 1: General requirements
2015/7 (IS)
2019/12(ed.2)
IEC/TC69/WG7
IEC/TS
- Part 2: Specific requirements for communication between electric road vehicle (EV) and infrastructure with respect to wireless power transfer(WPT) systems
2018/8 (TS)
2019/12 (IS)
IEC/TS
- Part 3: Specific requirements for the magnetic field wireless power transfer systems
2018/9 (TS) US
SAE J2954
Wireless Power Transfer for Light-Duty Plug-In Electric Vehicles and Positioning Communication
2016/5 (TIR)
2017/11 (RP)
2019 (IS)
SAE J2954TF

6. Estimated timeline Standard 2016 2017 2018 2019 2020 ISO 19363
Safety & Interoperability requirements for EVs – WPT
IEC
WPT systems
- Part 1: General requirements
IEC ,3
- Part 2: communication
- Part 3: magnetic field WPT
PAS
Ed.1 IS CD
CD2 WD
DIS
FDIS
Published
in 2015
Ed.1 IS
Ed.2 IS CD WD
CDV
FDIS TS
Ed.1 IS
CD2
CD3
DTS CD
CDV
FDIS

7. Thank you very much

8. Advantage of WPT for EV
High user-friendliness helps the promotion of EV
Easy to charge in dark environment
Easy to charge in bad weather environment without getting wet/dirty
Easy to charge for older/smaller people
Less strain for charging especially for the commercial /business users
Easy/continuous connection to the grid helps the promotion of smart grid
Reduction of the capacity of REESS will be realized when the wireless power transfer technology during stopping at intersections or continuous power supply during driving is developed in the future.