Development of Wireless Charging Technology

Electromagnetic radiation of different frequencies and intensities brings about electromagnetic interference and leakage of electromagnetic information. Therefore it is very important to search various magnetic shielding materials to prevent electromagnetic pollution.

In recent years, with the extensive use of smart phones, the requirements for magnetic shielding materials are getting higher and higher, which require light, thin, strong, and simple conductive or magnetic conductive materials can not meet these needs. Ferrite and ferrosilicon-aluminium soft magnetic materials are only suitable for high frequency, low permeability ,the effect is not satisfactory. The first and earlier successful application of nanocrystalline materials as magnetic shielding materials is by Apple Mobile Design Company.It is a new revolution in electromagnetic shielding.

The characteristics of nanocrystalline 1K107B shielding sheets are as below.

High permeability, maximum permeability of 80000, ultra-thin integrated structure, black PET protective film, acrylic pressure sensitive adhesive and easy-to-operate and install release film. The thickness of soft magnetic nanocrystalline material is less than 0.025 mm, the eddy current loss is low, the resistivity is 130, the conductivity is high, the flux density is 1.3 T, and the continuous working temperature is from – 50 to 110 ℃. The material width ranges from 5 mm to 80 mm. The working frequency is 50 hZ~300 khz.

Nanocrystalline shielding sheet widely used in mobile phones, tablets, notebooks and so on, which device will have magnetic field interference problem requires shielding protection of this material, also it is, EMC (electromagnetic compatibility) certification.

Wireless charging technology mainly achieves non-contact power transmission through electromagnetic induction, electromagnetic resonance, radio frequency, microwave, laser and other ways. According to the different power supply distances of radio power transmission in space, the forms of radio power transmission can be divided into three categories: short-range (100 kW/cm), medium-range (KW/m) and long-distance transmission.

Samsung S4 transmitter with Nanocrystalline shielding sheet

Pure Electric Vehicle Charging

The electromagnetic induction charging system of the charging device has a large flat canned magnetic core made of soft magnetic material and coiled at the charging station end and the automobile end. When charging, the two coils form a transformer close to each other. High frequency AC power is fed to the battery pack by the magnetic induction coupling between the primary stages. Low power loss and High permeability ,amorphous and nanocrystalline are suitable soft magnetic materials for making magnetic coupling devices.

Application of Wireless Charging Technology in Home Film and Television

Apple Airpower Charging Pillow

Starbucks’bar can charge mobile phones wirelessly

NIO ES8 electric vehicle with wireless charging function

The First Wireless Charging Community Bus Road No.1058 in Chengdu,China,2015

At Guangzhou International New Energy Vehicle Charging Pile Expo, a wireless charging pile equipment and its matching Beiqi EV200 model. The demonstrating wireless charging device is the first 6.6kW class wireless charging pile based on magnetically coupled resonance technology developed in China. The transmission distance is 20CM (+5), and the average transmission efficiency is over 90%. It is basically the same as the wire charging pile. It is suitable for the wireless charging of small and medium-sized electric vehicles.

Global Market Scale of Wireless Charging