International standard for wireless charging of electric vehicles

Korea is leading the international standardization of wireless charging technology, which is regarded as a core infrastructure for spreading electric vehicles in the future with innovative technologies such as high-power charging and charging while driving.


The Ministry of Trade, Industry, and Energy, the National Institute of Technology and Standards, will hold an international standardization conference on the 15th to establish an international standard for high-power wireless charging technology during stops proposed by Korea.


More than 30 people, including experts from domestic universities and companies such as Korea Advanced Institute of Science and Technology (KAIST), Hyundai Motor Company, and Wi Power-One, and foreign experts from 7 countries including the United States, Germany, Switzerland, and Israel, will participate online.


Wireless charging is a next-generation charging method that enables charging while parking and charging while driving. While countries around the world are promoting technology development and demonstration projects, Korea and Japan are competing to preoccupy international standards.


In the International Electrotechnical Commission (IEC), technical discussions on six kinds of international standard proposals, including three proposed by Korea and three proposed by Japan, are actively proceeding.


The wireless charging technology while stationary has been leading the international standardization with Japan proposing three standards. The Japanese standard only stipulates wireless charging with an output of 11kW or less, so there was a limit to technology growth. 11kW is similar to the slow wired charger (7kW) installed in apartments.


In July of last year, Korea proposed an international standard for high-power wireless charging technology of 50kW or more at the level of a fast charger to IEC and is promoting international standardization as innovative technology. The name of the standard was proposed by Professor Yoon Woo-yeol of KAIST as Electric Vehicle High Power Wireless Charging Interoperability and Safety.


The standard draft successfully completed the process of adopting the NP (New Proposal), the first gateway to the establishment of international standards in December of last year. As a result of the technical committee's vote, the PNP must satisfy both conditions: two-thirds of the full member countries approval and the participation of five or more experts.


When 50kW-class wireless charging is commercialized, it can charge up to 80% of the battery capacity in 1 hour, and it can charge the power that can drive 4-5km by charging only about 1 minute while waiting for a signal at an intersection or the like.


The meeting was set up for the first technical discussion of the project team, which was formed to establish an international standard for high-power wireless charging technology after the adoption of NP.


The conference will focus on discussion on the coil structure, which is a core component of a wireless charger.


The National Pyowon expects that Korea is leading the international standard establishment procedure as the chairman of the project team (Professor Yoon Woo-Yeol, KAIST), so that the elliptical coil method, which is our technology, will be advantageously applied to the international standard. The US proposed a circular coil, and Israel proposed a double-D (DD) type coil method.


In the field of charging while driving, another innovative technology for wireless charging of electric vehicles, Korea is proposing two kinds of international standards and is leading the way in international standardization in this field. The standard draft is wireless charging interoperability and safety while driving, and requirements for wireless charging communication while driving.


The NIS plans to hold an international standardization conference for electric vehicle wireless charging in July to lead the discussion on the international standardization of wireless charging technology while driving.


Wireless charging while driving is expected to be applied preferentially to buses that circulate on fixed routes. The battery can be charged even while driving, and it is expected to serve as a catalyst for the spread of electric vehicles.


Director of the National Institute of Technology and Standards Lee Sang-hoon said, based on innovative technologies such as high-power charging during stop and charging while driving, Korea can lead the international standardization of electric vehicle wireless charging technology. As interest is increasing, we will preempt international standards and support Korean companies' entry into the global market.

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