Shielding piece for wireless charging module group and wireless charging module group

Abstract

The invention discloses a shielding piece for a wireless charging module group and a wireless charging module group. The shielding piece comprises an outer-ring magnetic sheet and a central magnetizer. A hole matching the central magnetizer is formed in the outer-ring magnetic sheet. The central magnetizer is fixed in the hole. The outer-ring magnetic sheet includes at least one nanocrystalline strip layer and the central magnetizer is made of a soft magnetic ferrite material or is a cylindrical object formed by lamination of multiple magnetic powder core films. The shielding piece has advantages of small size and low manufacturing cost and is capable of improving the charging efficiency of the wireless charging module group.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a shielding sheet for a wireless charging module and a wireless charging module. Background technique [0002] Wireless charging technology is a method that uses near-field electromagnetic induction to transmit energy from the transmitter to the wireless charging receiving coil through a magnetic field. Compared with electric field coupling, the wireless charging technology based on the magnetic field coupling principle is closer to the conventional resonant switching power supply. [0003] In order to obtain higher charging efficiency and reduce the influence of electromagnetic fields on electronic devices during charging, magnetic materials are required. The function of the magnetic material is to distribute the magnetic field in the magnetic material with high magnetic permeability, preventing the magnetic field from passing through the magnetic material to the insi...

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Problems solved by technology

However, this solution also has some insurmountable shortcomings: ① "Magnetic Fragmentation" also significantly reduces the magnetic permeability μ', which leads to a decrease in the magnetic permeability of the single-layer magnetic material. Therefore, this technology is currently used for wireless charging. Magnetic materials need to increase the number of layers of amorphous materials to avoid the problem of increased loss (eddy current on the battery) caused by magnetic leakage, so the product is relatively thick; "Study" process method, the magnetic permeability cannot be accurately controlled, the process cannot accurately control the material parameters, the product yield rate is not high, and the process cost is high

[0004] To sum up, although the wireless charging market has broad prospects, there are still some insurmountable problems in existing technical solutions, such as low charging efficiency, high cost, complicated process and low yield rate.

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