Segmented Soft Magnetic Shielding Sheet for Wireless Charging Efficiency
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Solution Overview
Problem
Current magnetic shielding sheets used in wireless charging and near field communication (NFC) devices face inefficiencies in charging performance and electromagnetic interference, particularly due to high coercive force and remanence, which affect charging efficiency and NFC applications.
Innovation Solution
A high-performance shielding sheet with low coercive force and remanence, composed of soft magnetic materials with graphical slits and adhesive layers, optimized for lamination structure and EMI wave-absorbing materials, is developed to improve magnetic field shielding and reduce eddy current losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic shielding material is used, then magnetic shielding effect is achieved in a certain frequency band, but wireless charging efficiency is low and NFC performance is poor
Solution Approach 1:
The patent changes the magnetic properties of the shielding material by selecting soft magnetic materials with specific parameters (low coercive force, low remanence, high magnetic permeability) to optimize both shielding effectiveness and wireless charging efficiency across different frequency bands
Solution Approach 2:
The patent uses composite soft magnetic material structures combining different magnetic materials with complementary properties to achieve broad-band shielding while maintaining high wireless charging efficiency and NFC performance
2Reliability
If conventional magnetic shielding material is used, then magnetic shielding is provided, but eddy current losses are high causing temperature rise
Solution Approach 1:
The patent divides the continuous magnetic shielding material into segmented structures with insulated sections, which interrupts eddy current paths and reduces eddy current losses while maintaining magnetic shielding effectiveness
Solution Approach 2:
The patent employs porous or cellular magnetic material structures that reduce material density and eddy current paths while maintaining shielding effectiveness, thereby reducing energy losses and heat generation
3Reliability
If conventional magnetic shielding material is used, then shielding is achieved, but electromagnetic wave uniformity is poor causing transmission losses
Solution Approach 1:
The patent applies different magnetic material properties and thicknesses at different locations of the shielding structure to optimize electromagnetic wave distribution and reduce transmission losses while maintaining overall shielding effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The shielding sheet enhances wireless charging efficiency and maintains effective NFC performance by reducing transmission losses and increasing electromagnetic wave uniformity, thereby improving the overall performance of coil modules.
Implementation Method 1
a device for isolating the metal in the battery must be disposed between a receiving coil and the mobile phone battery, so as to block the magnetic line of force
Implementation Method 2
The working principle of wireless charging technology is based on the principle of magnetic field coupling
Implementation Method 3
the metal in the battery will generate an induced current, which is usually referred to as 'eddy current'
Data Source
AI summary
The invention relates to a high-performance shielding sheet, preparation method thereof and coil module comprising the same. The high-performance shielding sheet includes at least one sheet which include: at least one shielding layer with low coercive force and low remanence formed of a soft magnetic material; and at least one adhesive layer disposed on at least one side of the shielding layer; and wherein the shielding layer includes a plurality of graphical slits, and the plurality of graphical slits divide the shielding layer into a plurality of graphical fragments; and wherein the plurality of graphical slits are filled with the adhesive layer, enabling the plurality of graphical fragments to be separated from each other and have a good insulation property. The advantages include: improving the electric charging conversion rate, increasing the charging efficiency, reducing the transmission loss, and increasing the uniformity of the electromagnetic wave transmission medium.