Composite laminated magnetic material structure for electromagnetic shielding and preparation method thereof

Abstract

The invention provides a composite laminated magnetic material structure for electromagnetic shielding and a preparation method thereof. The composite laminated magnetic material structure for electromagnetic shielding comprises a soft magnetic alloy steel strip material structure and a ferrite magnetic material layer or a magnetic power adhesive layer, wherein the soft magnetic alloy steel stripmaterial structure comprises at least one soft magnetic alloy steel strip material layer; and the ferrite magnetic material layer or the magnetic power adhesive layer are attached to the surface of the soft magnetic alloy steel strip material structure. The composite laminated magnetic material structure for electromagnetic shielding is a composite laminated structure comprising the soft magneticalloy steel strip material layer and the ferrite magnetic material layer or the magnetic power adhesive layer, thereby being capable of integrating performance advantages of the two materials, havingan excellent magnetic isolating effect, reducing a problem of heating energy consumption, greatly expanding the application frequency (100kHz-20MHz) of the magnetic material, being capable of simultaneously meeting electromagnetic shielding requirements of wireless charging such as Qi and A4WP, and having important significance for improving the charging efficiency and the charging distance.

Description

technical field [0001] The invention belongs to the field of wireless energy transmission and electromagnetic shielding application of magnetic materials in power electronic magnetic components, and in particular relates to a composite laminated magnetic material structure for electromagnetic shielding and a preparation method thereof. Background technique [0002] In recent years, with the popularity of smart phones, digital cameras, tablet computers and other small portable mobile devices, people's living habits have undergone great changes, and portable electronic devices have become one of the essential tools in people's work and life . As people's living habits become more and more abundant, the types of electronic devices are required to be more and more diverse, and the functions (such as wireless charging, etc.) are getting stronger and stronger, and their power consumption is also increasing. Portable electronic devices need to Charge frequently to maintain normal ...

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a composite laminated magnetic material structure for electromagnetic shielding and its preparation method, which is used to solve the problem of using only soft magnetic alloy steel strip materials as wireless charging in the prior art. When the frequency reaches 3MHz or more, the magnetic permeability of the soft magnetic alloy steel strip material will drop greatly, and the magnetic loss will increase significantly, which can no longer meet the problem of electronic equipment, and only ferrite and magnetic powder glue The low-frequency magnetic permeability of the material as a wireless charging sheet is far inferior to that of the soft magnetic alloy steel strip material, and its saturation magnetic induction is less than one-third of that of the soft magnetic alloy steel strip material. If it is used for high-current wireless charging, Ferrite materials are very prone to saturation abnormalities, thus losing the function of magnetic isolation, and even burning batteries and electronic equipment, etc., and because the temperature stability of its magnetic permeability changes too much, it is not conducive to the problem of electromagnetic shielding for wireless charging

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