Author：Date：2019-7-31
Magnetic shielding: Provide a low-impedance path for magnetic flux, reduce the magnetic flux emitted outward, reduce the impact on surrounding metal objects, and prevent eddy currents and signal interference.
Magnetic permeability reduction: increase the coupling coefficient, improve the magnetoelectric conversion efficiency, use a smaller number of turns to achieve a higher inductance coil, reduce the coil resistance, reduce the efficiency of heat generation (the higher the number of turns, the higher the resistance) .
Comparison of charging efficiency of nanocrystalline magnetic sheets:
The real scene was simulated, and the comparison test was carried out under the same conditions. The charging efficiency was compared by using nanocrystalline magnetic sheets with different thicknesses and ferrites with different magnetic permeability and different thickness. As the thickness increases, the charging efficiency continues to increase, but the nanocrystal is not as thick as possible, and is basically saturated at 0.1 mm. Therefore, when designing the wireless charging module, the nanocrystalline magnetic sheet does not need to be made too thick. Increase material costs. The rule of ferrite is similar to that of nanocrystals. The higher the magnetic permeability, the higher the charging efficiency, the thicker the thickness, the higher the charging efficiency. However, under the same charging efficiency, the thickness of the nanocrystalline magnetic sheet is only ferrite. half.
Mobile wireless charging trends:
Function: WPC→WPC+NFC→WPC/Airfule+NFC
Wireless charging - wireless charging + - free charging
Power: 5W → 7.5W → 10W → 15W
Slow charge - general charge - fast charge - flash charge
Magnetic flux development trend:
Receiving end: Absorbing material→ Ferrite→Amorphous+Ferrite→Nanocrystal
Nanocrystalline magnetic sheet:
Thin - ultra-thin: 0.14 → 0.12 → 0.11 → 0.10
High magnetic permeability, low loss - high Q
Application and popularization:
n low power: mobile phones, smart wear, etc.
n medium power: computer, kitchen appliances, etc.
High power: infrastructure such as electric cars and roads
In the future, it will be the world of wireless, changing lives and changing the world.
Remark: News fromm Amorphous China
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