Magnetic Shielding Sheet with Oxidation Prevention for Wireless Power
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Solution Overview
Problem
Magnetic field shielding sheets made of metal components face issues with oxidation and micro-piece separation, leading to reliability concerns and short-circuiting during reliability tests, especially when exposed to moisture.
Innovation Solution
A magnetic field shielding sheet with a micro-piece separation and oxidation preventing member, such as a protective film or coating layer, is applied to the side surface to prevent oxidation and micro-piece separation, comprising a first sheet layer for one frequency band and a second sheet layer for another frequency band, with the member covering the side surfaces and potentially extending to cover the second sheet layer as well, using materials like amorphous alloys and ferrite sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic field shielding sheet is made of a magnetic material including a metal component, then shielding performance is improved, but oxidation of the exposed surface occurs during reliability tests
Solution Approach 1:
A non-magnetic material layer is introduced as an intermediary between the magnetic material and the external environment. This layer acts as a barrier that prevents moisture and oxygen from reaching the metal component, thereby preventing oxidation while maintaining the magnetic shielding performance of the underlying magnetic material.
Solution Approach 2:
The shielding sheet is constructed as a composite structure combining magnetic material and non-magnetic material in specific layers. This composite design allows the magnetic material to provide shielding performance while the non-magnetic material provides corrosion resistance and environmental protection.
2Reliability
If a magnetic field shielding sheet is made of a magnetic material including a metal component, then shielding performance is improved, but micro-pieces separate from the stamped surface
Solution Approach 1:
The non-magnetic material layer serves as a binding intermediary that holds the magnetic material layers together. This intermediate layer prevents the separation of micro-pieces from the stamped surface by providing adhesion and structural cohesion to the composite shielding sheet.
Solution Approach 2:
The multi-layer composite structure with non-magnetic material interspersed between magnetic material layers creates a more cohesive and stable structure. This composite design reduces the tendency of micro-pieces to separate during stamping and handling processes.
3Ease of manufacture
If the exposed surface is left without protection, then manufacturing simplicity is maintained, but oxidation and micro-piece separation occur
Solution Approach 1:
The non-magnetic material layer is incorporated into the shielding sheet structure during the manufacturing process, before the product undergoes reliability testing or usage. This preliminary protective action ensures that the magnetic material is already protected against oxidation and micro-piece separation, eliminating the need for post-manufacturing treatments.
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
Prevents oxidation and micro-piece separation, enhancing the reliability of the product by preventing short-circuits and ensuring effective performance in both wireless power transfer and near field communication.
Implementation Method 1
a first sheet layer configured to shield a magnetic field of a first frequency band and concentrate the magnetic field in a designated direction
Implementation Method 2
a second sheet layer configured to shield a magnetic field of a second frequency band and concentrate the magnetic field in a designated direction
Data Source
AI summary
A magnetic field shielding sheet and a wireless power transfer module that includes the same are provided. The magnetic field shielding sheet, according to an exemplary embodiment of the present invention, which is applied to a combo-type antenna unit that includes at least two antennas using different frequency bands of magnetic fields, comprises: a first sheet layer that includes a metal component that shields a first frequency band of a magnetic field and concentrates the magnetic field in a designated direction; a second sheet layer that shields a second frequency band of a magnetic field and concentrates the magnetic field in a designated direction; and a micro-piece separation and oxidation preventing member provided on a side surface of the first sheet layer in order to prevent a micro-piece from being separated from the side surface of the first sheet or to prevent the side surface from being oxidized. According to the present invention, by virtue of the micro-piece separation and oxidation preventing member provided on the side surface of the first sheet layer, it is possible to prevent the side surface from being oxidized and to prevent short-circuiting due to particles.