Composite Magnetic Sheet for Wireless Charging Shielding
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Solution Overview
Problem
Existing electromagnetic shielding sheets for wireless power transmission face reliability issues in harsh environments due to surface damage and permeability mismatch, leading to inefficiencies and compatibility problems with diverse wireless power standards.
Innovation Solution
A composite magnetic sheet with a stacked structure of unit magnetic sheets having different surface roughness and porosity, where a soft magnetic sheet with a low surface roughness is stacked on an outermost surface, enhancing reliability in hazardous environments while maintaining electromagnetic shielding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a thin-film type metallic alloy with high permeability is used as a shielding material, then electromagnetic shielding efficiency is improved, but impedance matching with electromagnetic coil deteriorates
Solution Approach 1:
The patent applies local quality by creating a composite magnetic sheet where different regions have different permeability characteristics. The first magnetic sheet part has high permeability for shielding efficiency, while the second magnetic sheet part has adjusted permeability for impedance matching, allowing each region to optimize its local function.
Solution Approach 2:
The patent uses composite materials by combining two different magnetic sheet parts with distinct permeability properties into a single composite structure. This composite approach enables simultaneous achievement of high shielding efficiency and proper impedance matching that cannot be achieved with a single uniform material.
2Adaptability or versatility
If a cracking process is performed on a thin-film type metallic alloy to adjust permeability, then permeability is improved, but surface integrity deteriorates due to burrs or fragments
Solution Approach 1:
The patent segments the magnetic shielding structure into two separate magnetic sheet parts stacked together. This segmentation allows the first part to undergo cracking process for permeability adjustment while the second part maintains intact surface, preventing burrs or fragments from compromising overall reliability.
Solution Approach 2:
The patent applies local quality by concentrating the permeability adjustment function in the first magnetic sheet part through cracking process, while the second magnetic sheet part maintains high surface integrity. This localized functional differentiation resolves the contradiction between permeability adjustment and surface integrity.
3Ease of manufacture
If a single-layer magnetic sheet is used, then manufacturing simplicity is maintained, but reliability in hazardous environments deteriorates
Solution Approach 1:
The patent employs composite materials by stacking two magnetic sheet parts with different surface roughness and porosity characteristics. This composite structure enhances reliability in hazardous environments through synergistic effects while maintaining manufacturing simplicity through a straightforward stacking process.
Solution Approach 2:
The patent utilizes porous materials by controlling the porosity of each magnetic sheet part differently. The first magnetic sheet part has higher porosity for permeability adjustment while the second part has lower porosity for surface integrity, creating a composite structure that resists salt water penetration more effectively than a single-layer sheet.
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 composite magnetic sheet provides enhanced reliability and compatibility with various wireless power transmission methods, maintaining high transmission efficiency and resistance to salt water penetration, while minimizing the influence of permanent magnets.
Implementation Method 1
standard methods for wireless power transmission include a wireless power consortium (WPC) method, an alliance for wireless power (A4WP) method, and a power matters alliance (PMA) method, and the standard methods are technically classified into magnetic induction methods and magnetic resonance methods
Implementation Method 2
standard methods for wireless power transmission include a wireless power consortium (WPC) method, an alliance for wireless power (A4WP) method, and a power matters alliance (PMA) method, and the standard methods are technically classified into magnetic induction methods and magnetic resonance methods
Data Source
AI summary
The present invention relates to an electromagnetic shielding sheet capable of improving reliability. Particularly, the present invention provides a composite magnetic sheet for electromagnetic shielding structured such that an independent soft magnetic sheet, which has a low surface roughness, is laminated on the outermost surface of a soft magnetic sheet having a lamination structure, thereby implementing laminated composite sheets having different surface roughness or porosity characteristics; as a result, the reliability in an external hazardous environment, such as saline water, can be substantially enhanced while maintaining the efficiency of electromagnetic shielding.