Segmented Electromagnetic Shielding Layer for Wireless Power Transfer
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Solution Overview
Problem
Existing wireless charging systems face efficiency issues due to the low magnetoresistance of magnetic shielding layers, which can cause the magnetic field to form a close loop, altering the inductance value of the transmitting coil and affecting transmission efficiency.
Innovation Solution
An electromagnetic shielding layer comprising a first magnetic shielding layer with a hollow area and a solid area, where the hollow area increases magnetoresistance, preventing the high-frequency magnetic field from passing through and stabilizing the inductance value, combined with a second shielding layer to protect electrical equipment from magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a magnetic shielding layer with low magnetoresistance is used to shield the receiving coil, then the magnetic field interference to charging equipment is reduced, but the transmitting coil's inductance value changes due to magnetic field close loop formation
Solution Approach 1:
The magnetic shielding layer is segmented into multiple regions with different magnetoresistance characteristics. The first region has low magnetoresistance to guide magnetic field lines away from charging equipment, while the second region has high magnetoresistance to prevent magnetic field close loop formation and maintain transmitting coil inductance stability.
Solution Approach 2:
Different regions of the magnetic shielding layer are assigned different local properties (magnetoresistance values) to fulfill different functions. The first region is designed with low magnetoresistance for magnetic field shielding, while the second region is designed with high magnetoresistance for inductance stabilization, creating a spatially varying quality distribution.
2Productivity
If the receiving coil is placed close to the transmitting coil to improve transmission efficiency, then energy transfer is enhanced, but the magnetic shielding layer causes inductance value changes
Solution Approach 1:
The magnetic shielding layer is divided into functional segments where the first region enables close proximity placement for high transmission efficiency, while the second region compensates for inductance changes to maintain resonant frequency stability.
Solution Approach 2:
The magnetic shielding layer's magnetoresistance parameter is spatially varied to achieve different effects in different regions, allowing the system to simultaneously achieve high transmission efficiency and maintain resonant frequency stability through parameter optimization.
3Object-affected harmful factors
If a uniform magnetic shielding layer is used to protect charging equipment, then magnetic field interference is reduced, but the transmitting coil's magnetic field forms a close loop
Solution Approach 1:
The magnetic shielding layer is segmented into a first region for shielding charging equipment and a second region for preventing magnetic field close loop formation, allowing both protective functions to be achieved simultaneously through spatial differentiation.
Solution Approach 2:
Different local regions of the magnetic shielding layer are assigned different magnetoresistance properties to perform different functions: the first region provides magnetic field shielding while the second region prevents close loop formation, creating a functionally differentiated 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
This configuration enhances transmission efficiency by maintaining the resonant frequency and reducing the impact of magnetic shielding on the inductance value, ensuring effective energy transfer while protecting electrical equipment from magnetic interference.
Implementation Method 1
the hollow area is used to increase magnetoresistance of the spatial magnetic field
Implementation Method 2
the second shielding layer is disposed beneath the first shielding layer to shield a magnetic field penetrating the first shielding layer for protecting the electrical equipment
Implementation Method 3
The electromagnetic shielding layer is used to shield an interference of a spatial magnetic field on electrical equipment
Data Source
AI summary
An electromagnetic shielding layer and a wireless electrical energy transmission device having the electromagnetic shielding layer are provided. A first shielding layer is composed of a hollow area and a solid area. At the hollow area, because the magnetoresistance of the air is greater than the magnetoresistance of the magnetic sheet, it is not easy for the magnetic lines of flux of the high frequency magnetic field of the primary transmitting coil to pass the hollow area, so that the inductance value of the primary transmitting coil won't be affected easily by the change of the magnetoresistance during working Under the receiving coil is provided with magnetic sheet as much as possible to ensure the coupling of the receiving coil and the transmitting coil and to enhance the transmission efficiency.