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Nanocrystalline technology innovation, with the rapid development of wireless charging

Nanocrystalline technology innovation, with the rapid development of wireless charging

2021-12-01

Following the rapid development of wireless charging, many industries such as smart phones, smart wearable devices, smart home systems, and new energy vehicles are now in full bloom, and the 100 billion yuan sales market is once again booming. However, there are many difficulties in wireless charging and make people in the manufacturing industry a headache. The entire industry chain has moved toward five major development trends: simplicity, fast charging, temperature control, intelligence, and playability.


Recently, mobile phone manufacturers such as Huawei mobile phones have increased the wireless network wireless charging output power to 15W, which has greatly encouraged the entire manufacturing industry. To maintain power wireless charging, wireless charging practitioners face many challenges at this stage, including: high conversion efficiency in electromagnetic induction, tighter magnetic coupling, magnetic interference, thermoelectric effect, part correction, and load adjustment. There are several problems, such as the inability to point the charging part of the battery for wireless charging, the high efficiency of battery charging conversion, and the long battery charging time.


As one of the important components of wireless charging technology, Jinxin Magnetic Materials plays a role in improving the magnetic induction electromagnetic field and shielding the interference of electromagnetic coils in the wireless charging equipment. Therefore, the wireless charging equipment has the function of permanent magnetic materials and product specifications. Requirements such as credibility are relatively high.


   Although cross-generational products attract attention, peculiar fun is not the key to gaining a sales market. In the end, customers still care about feelings.


Although wireless network wireless charging is important to improve the customer experience, it also has the problem of slow battery charging, so there is a shortage of relatively increasing battery charging output power. However, the traditional ferrite core material has a serious hot problem in wireless charging, and the power battery charging requirement can no longer be considered.


  In comparison, nanocrystalline raw materials contain a variety of probabilities, and they have great potential for development in wireless charging in the future. Therefore, in wireless charging applications and RX module design schemes, the advantages of nanocrystalline raw materials are fully presented.


Nanocrystalline raw materials have a variety of excellent comprehensive magnetic energy, such as high saturation magnetic induction (), magnetic permeability> 800, high frequency loss under high magnetic induction, and so on. It is the best comprehensive material on the market at this stage. Nowadays, nanocrystals can excel in the detection of various important main parameters of magnetic materials by virtue of their advantages, and gradually replace ferrite cores to become the new choice of many wireless charging manufacturers.


  According to statistics, the saturation magnetic inductance of the amorphous Nano-M-Sheet far exceeds that of the ferrite core, and its anti-saturation capability far exceeds that of the ferrite core. The magnetic induction intensity of Nano-M-Sheet raw material does not change much with temperature, and it is not easy to be magnetically saturated, and its temperature reliability is better than that of ferrite cores.


Aluminum alloy amorphous strip


In addition, Nano-M-Sheet raw materials have the characteristics of high saturation magnetic flux and low loss as well as high-quality thermal conductivity. Under the same wireless charging standards, the temperature of Nano-M-Sheet raw materials is higher than that of ferrite. The core is 7~8℃ lower. In contrast, the raw materials of ferrite cores are very easy to exceed the saturation state. In wireless charging applications, the temperature rises, the magnetic induction decreases, the shielding characteristics decrease, the vortex increases, and the hot is more serious, resulting in polarization. The characteristics of Nano-M-Sheet raw materials are very stable below 80°C. As the temperature increases, although the magnetic induction decreases, the transformation is not strong.


At the level of nanocrystalline raw material product research and development, the soft magnetic material Hc is reduced and the Bs is increased to carry out the improvement of the alloy composition. For the current 18μm thin nanocrystalline amorphous ribbon, we will reduce the eddy current loss, increase the frequency network bandwidth, and reduce the thickness of the product to 12~15μm. According to the improvement of permeability and product consistency, the overall goal of quenching the nanocrystalline amorphous strip with constant support force exceeds 12,000 to 15,000.


According to statistics, when the nanocrystalline amorphous ribbon is subjected to crystallization and constant support force quenching and tempering treatment, it will cause magnetic anisotropy, making the length and short orientation of the thin ribbon difficult to be magnetized, and then manipulating the permeability in a large range , To produce nanocrystalline soft magnetic materials with different permeability. The characteristic of this kind of low permeability nanocrystalline soft magnetic material is that the eddy current loss is small, and the decrease of permeability can be suppressed under the condition of higher frequency and electromagnetic field overlapping, so it can be applied to DC accumulation in the high frequency region.


   At the technical level of free online insulating layer coating of nanocrystalline amorphous ribbons, amorphous will reduce loss, increase frequency network bandwidth, and reduce product thickness for technical improvements. In the future, Amorphous will also develop and design a type of soft magnetic powder based on the technology of the cast sheet that can reduce eddy current loss, increase frequency network bandwidth, and reduce the thickness of the product.


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