Wireless charging technology market forecasting and technical obstacles

< p> Navigant Research, a global green energy market analysis company, recently released a report called "Wireless Charging Systems for Electric Vehicles." In the report, the company pointed out that from 2013 to 2022, the market annual growth rate of light-duty wireless charging systems will reach 108%. By 2022, the annual sales of such systems will reach 302,000 sets.

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Forecast of market growth of wireless charging systems on all continents in 2013-2022

Not long ago, the wireless charging system for electric vehicles was still in the research and development stage and the initial testing stage. In 2013, Bosch signed an agreement with Evatran Wireless Charging Systems to launch the technology in volume production in the first quarter of 2014. Toyota has also begun testing its newly developed WiTricity wireless charging technology.

In addition, the International Association of Engineers J2954 Light Vehicle, Electric Vehicle, and Hybrid Vehicle Wireless Power Transmission (WPT) Working Group has reached a consensus on two key elements in the SAE Technical Information Report to begin the first wireless charging technology. Phase commercialization test. The system operates at 85 kHz. The working group also defined wireless charging for 3 power modes for light vehicles, namely WP1/WP2/WP3.

At the 2014 Hybrid and Electric Vehicle Technology Symposium held recently, engineers also elaborated on various aspects of the development of electric vehicle wireless charging systems.

Paul Guckian, an engineer at Qualcomm responsible for developing the Halo wireless charging system, points out that the advantages of this type of system are its ease of use. Halo is a business unit of Qualcomm, which is responsible for the development of wireless charging systems. Recently, it has also cooperated with the University of Auckland in New Zealand to build a special “charging lane” by means of charging during the journey. The vehicle does not need to stop at all. The battery can be filled by driving in this lane.

Guckian pointed out that wireless charging systems need to meet the following criteria:

Safety, anti-interference (refers to conflict with other wireless charging systems), in line with global charging regulations and standards, energy conversion efficiency needs more than 90%, package structure (volume and weight control), ease of use (receiving / transmitting coils) Alignment tolerance.)

The current three aspects of wireless charging are still missing:

Frequency standard for power transmission: To prevent inter-system interference, the SAE Engineers Association selected 85 kHz as the standard frequency, while Qualcomm has 40/85/145 kHz frequency configurations.

Electromagnetic wave radiation protection standards: The current global standards are formulated by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). However, when wireless charging systems are popular today, the radiation of these systems to humans, animals and plants; detection mechanisms; external object protection (such as when conductive or ferromagnetic materials are close to the wireless charging system or a safety hazard) has become a new consideration. .

Implanted device interference: Some medical devices implanted in the human body (such as cardiac pacemakers) will malfunction near the wireless charging system, so technical improvements or notices will be made in this regard in the future.

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