In recent years, wireless charging technology has become more and more mature, and has become the standard configuration of flagship phones by major mobile phone manufacturers.As an essential part of wireless charging module, the market of nanocrystalline sheet is in the early stage of rapid development.
Nowadays, wireless charging technology is no longer the main push configuration of high-end models, and it is gradually popularized. Many new mobile phones have been equipped with wireless charging technology. In 2020, more than 16 mainstream models will be equipped with this technology. In addition, with the nine models launched in 2019, nearly 30 mainstream models will be equipped with wireless charging technology.
According to IHS Markit data forecast, the wireless charging receiver will ship nearly 2 billion pieces in 2025.Wireless charging products are basically divided into receiving end and transmitting end. Both ends need a certain amount of magnetic materials to improve charging efficiency and shield electromagnetic interference.
Low cost soft magnetic materials such as ferrite are often used in wireless charging transmitter because there is no high requirement for material thickness and performance. Due to the need to ensure sufficient power when charging, the anti saturation performance of magnetic materials is the main factor affecting the charging power improvement, which directly determines the performance of wireless charging, so nanocrystalline magnetic materials with better performance are widely used.
The shielding performance of nanocrystalline materials has a strong correlation with permeability. Electronic products such as mobile phones will produce a large magnetic field when charging. Magnetic materials need high permeability to play an effective electromagnetic shielding role to avoid interference of mobile phone battery, motherboard and other components.
The thickness, b value and permeability of the material are the key factors affecting the charging efficiency and heating.
Using magnetic material as shield can avoid the mutual influence of internal and external magnetic fields. However, when the metal material with good conductivity is used as the shield, the high frequency alternating magnetic field of the coil product will cause large eddy current on the shield cover. The eddy current has the function of demagnetization, which weakens the magnetic field, so as to achieve the purpose of shielding.
In addition to smart phones, smart wear and other applications, new energy vehicles in the future are also promising application for nanocrystalline materials.
The nanocrystalline materials used for wireless charging of mobile phones and automobiles benefit from the advance of materials.