On May 11, wireless charging technology is not unfamiliar to us. Many Electronic devices, including mobile phones, have used wireless charging, but for cars, wireless charging is still relatively new. rare. However, with the release of my country’s new national standard for wireless charging of electric vehicles, this technology can be implemented faster.
Recently, the China Electricity Council (CEC) released China’s national standard for wireless charging of electric vehicles (referred to as “national standard” or GB standard), in which WiTricity’s patented technology plays a foundational role.
The National Standardization Administration announced the GB/T 38775 national recommended standard, which will be implemented on November 1, 2020. There are 4 items in it, including:
1. GB/T 38775.1 “Wireless Charging System for Electric Vehicles Part 1: General Requirements”;
2. GB/T 38775.2 “Wireless Charging System for Electric Vehicles Part 2: Communication Protocol between Vehicle Chargers and Charging Equipment”;
3. GB/T 38775.3 “Wireless Charging System for Electric Vehicles Part 3: Special Requirements”;
4. GB/T 38775.4 “Wireless Charging System for Electric Vehicles Part 4: Electromagnetic Environment Limits and Test Methods” has a total of 4 national standards.
The formulation of this set of national standards for wireless charging of electric vehicles is the result of cooperation between China Electric Power Research Institute (CEPRI), China Automotive Technology and Research Center (CATARC), China Electricity Council (CEC) and WiTricity.
It is understood that the working principle of WirTricity’s magnetic resonance charging technology is that after the vehicle is parked in a suitable location, the charging pad under the ground will automatically charge the vehicle. There is a circular coil inside the charging pad to convert the alternating current into magnetic waves, and the power amplifier controls the current size and frequency of the electromagnetic waves.
Inside the car, located near the car’s power management system, is a receiver that contains another coil that is tuned to receive electromagnetic waves at the same frequency as the source coil.
The receiver receives the electromagnetic waves and reconverts the magnetic energy into electrical current, which is stored in the car battery. This magnetic resonance charging is more efficient than other wireless charging technologies because the energy is lost as little as 7 to 10 percent as it moves through the air.
For nearly four years, WiTricity has cooperated with China Electricity Council, China Electric Power Research Institute, and China Automotive Technology Research Center to assist in the standardization of wireless charging for electric vehicles in China. WiTricity has more than 1,400 issued and pending patents worldwide, of which 20 Chinese patents are the core patents of the national standard system.
Chinese automakers and Tier 1 suppliers can develop and deploy wireless charging technology solutions for electric vehicles in accordance with national standards. The new approved standard will be an important market driver for the deployment of vehicles and public charging infrastructure. WiTricity has worked closely with the National Standards Committee on several major technical issues, including efforts to align Chinese standards with other international standards (SAE J2954, ISO 19363, IEC 61980) that will be published in 2020 and 2021.
WiTricity also actively cooperates with Chinese Tier 1 suppliers to assist them in designing and implementing systems that meet Chinese national standards. At present, Zhejiang Wanan Technology Co., Ltd. (Wan’an) and Anjie Unlimited Technology (Suzhou) Co., Ltd. (Anjie) have obtained WiTricity’s technology and industry-leading design authorization, which also includes foreign object detection, position detection and communication and other key auxiliary functions. Wanan and Anjie develop and commercialize efficient wireless charging systems for electric vehicles, which are sold to leading automaker brands in the Chinese market.
Wireless charging of electric vehicles is not only convenient, but crucial to the autonomous charging of future self-driving vehicles such as driverless taxis or driverless vans.
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