Fractured Magnetic Shielding Sheet for Wireless Charging
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Solution Overview
Problem
Existing magnetic sheets for wireless charging have low structural reproducibility and difficulty in optimizing charging efficiency due to irregular fracturing, which affects the consistency of magnetic characteristics and negatively impacts the shielding performance.
Innovation Solution
A magnetic sheet formed from a metal ribbon with regularly fractured portions, arranged at specific intervals and shapes, such as pyramidal or conical, to enhance reproducibility and adjust magnetic characteristics for improved charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a magnetic sheet is fractured using conventional pressing methods, then fragments are formed to reduce eddy current loss, but the fragments have random shapes and arrangements resulting in low structural reproducibility and inconsistent magnetic characteristics
Solution Approach 1:
The magnetic sheet is segmented into multiple fragments through controlled fracturing. The segmentation divides the continuous magnetic sheet into discrete pieces that can be arranged in specific patterns, reducing eddy current paths while maintaining magnetic shielding effectiveness.
Solution Approach 2:
Different regions of the magnetic sheet are given different local qualities through varied fragment shapes and arrangements. The fracturing creates fragments with specific local characteristics (shapes, sizes, orientations) that are optimized for their positions, resulting in consistent magnetic properties across the entire sheet.
2Loss of energy
If fragments are formed with random shapes and arrangements, then eddy current loss is reduced, but charging efficiency decreases due to inconsistent magnetic characteristics
Solution Approach 1:
The physical parameters of the fragments (shape, size, orientation, spacing) are systematically changed and controlled rather than being random. By optimizing these parameters, the magnetic characteristics become consistent across the sheet, improving charging efficiency while maintaining eddy current loss reduction.
Solution Approach 2:
The conventional mechanical pressing method that produces random fragments is replaced with a controlled fracturing system that creates fragments with specific geometries and arrangements. This substitution allows precise control over fragment characteristics, ensuring consistent magnetic properties and improved charging efficiency.
3Device complexity
If a magnetic sheet is used without fracturing, then structural simplicity is maintained, but shielding performance is insufficient due to high eddy current loss
Solution Approach 1:
The magnetic sheet is segmented into multiple fragments to interrupt eddy current paths, significantly reducing eddy current loss and improving shielding performance. The segmentation maintains relative structural simplicity while achieving the required electromagnetic shielding effectiveness.
Solution Approach 2:
The fractured magnetic sheet creates a porous-like structure with gaps between fragments. This porous configuration increases magnetic path length and reduces eddy current loops, enhancing shielding performance while maintaining a relatively simple overall structure.
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 regular fracturing of the magnetic sheet ensures stable and reproducible shielding performance, enhancing wireless charging efficiency by guiding magnetic lines of force in a consistent manner.
Implementation Method 1
a magnetic sheet performing a shielding function is disposed between the receiving coil and the battery. The shielding sheet serves to shield the battery from a magnetic field generated by the receiving coil
Implementation Method 2
a current is generated in the secondary coil according to inductive coupling between the primary coil and the secondary coil to provide energy used to charge a battery
Implementation Method 3
in regard to reducing eddy current loss, a technique of fracturing a magnetic sheet and additionally processing the fractured magnetic sheet into a plurality of fragments to be used has been proposed
Data Source
AI summary
A sheet for shielding electromagnetic waves includes a magnetic sheet formed of a metal ribbon. The magnetic sheet includes fractures disposed in a plurality of cracked portions comprising a plurality of metal ribbon fragments.