Magnetic Sheet Crack Lines Wireless Power Shielding
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Solution Overview
Problem
Current magnetic sheets used in wireless power charging technologies face challenges in efficiently shielding and transmitting electromagnetic fields due to limitations in their design, which affects the performance and efficiency of wireless power transfer.
Innovation Solution
The magnetic sheet is designed with alternating regions having crack lines formed in different directions, creating patterns such as concentric polygons or cross-shapes, which are linearly crushed by a roller with protrusions, enhancing magnetic field management and reducing eddy currents, and are stacked in the wireless power charging apparatus to improve shielding and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional magnetic sheet with uniform structure is used, then the manufacturing process is simple, but the shielding and transmission efficiency of electromagnetic fields is insufficient
Solution Approach 1:
The magnetic sheet is divided into multiple regions (first region and second region) with different crack line orientations. Each region has crack lines formed in specific directions (first direction and second direction respectively), creating segmented functional zones that collectively improve electromagnetic field shielding and transmission efficiency while managing eddy currents more effectively than a uniform structure.
Solution Approach 2:
Different regions of the magnetic sheet are given different local structures through crack lines oriented in different directions. The first region has crack lines in a first direction while the second region has crack lines in a second direction, allowing each local area to optimize its magnetic properties for specific electromagnetic field management requirements.
2Reliability
If the magnetic sheet structure is made complex to improve performance, then shielding efficiency improves, but the manufacturing process becomes more difficult
Solution Approach 1:
The crack lines in both regions are formed at regular intervals, creating periodic patterns. This periodic structure achieves complex electromagnetic field management functionality while maintaining manufacturability through systematic, repeating formation processes rather than irregular complex patterns.
3Volume of moving object
If the magnetic sheet is made thinner to enable miniaturization, then device size is reduced, but the shielding and transmission efficiency may deteriorate
Solution Approach 1:
Instead of relying solely on increasing thickness to improve shielding efficiency, the invention introduces directional complexity in the plane dimension through crack lines oriented in different directions in different regions. This dimensional approach allows thin magnetic sheets to achieve enhanced electromagnetic field management through in-plane structural variation rather than out-of-plane thickness increase.
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
This design effectively reduces eddy currents and enhances the shielding and transmission efficiency of electromagnetic fields, allowing for improved performance in wireless power charging systems and adaptability across various frequency bands, while also enabling miniaturization and thinning of the apparatus.
Implementation Method 1
This design effectively reduces eddy currents and enhances the shielding and transmission efficiency of electromagnetic fields
Implementation Method 2
the magnetic sheet shields and collects an electromagnetic field generated by the transmission and reception coil to significantly decrease an influence of the magnetic field on the electronic device
Data Source
AI summary
A magnetic sheet includes a first region and a second region disposed adjacent to each other on a same surface, wherein the first region includes first crack lines formed in a first direction, and the second region includes second crack lines formed in a second direction.