Patterned Soft Magnetic Sheet for Thin Wireless Power Reception
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Solution Overview
Problem
Existing wireless power transfer systems face limitations in achieving high magnetic permeability and efficiency due to the thickness constraints of soft magnetic layers, particularly when using ferrite materials or composite metal powder and polymer resin sheets, and suffer from lower magnetic permeability and increased magnetic loss in metal ribbon applications.
Innovation Solution
A wireless power receiving apparatus featuring a substrate with a laminated soft magnetic layer formed into patterns, including at least 3 lines radiated from a predetermined point, and a receiving coil laminated on this layer, which can include an edge surrounding the patterns, utilizing a metal ribbon with a frequency band of 100 kHz to 200 kHz to enhance magnetic permeability and reduce eddy current loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ferrite material soft magnetic layer is used, then magnetic permeability is good, but thickness is limited due to high-temperature firing constraints
Solution Approach 1:
The patent changes the material composition parameters by introducing a specific ferrite compound formula (Li2SiO3-MgO-Al2O3-SiO2 system) and controlling the molar ratios of components. This parameter optimization enables the soft magnetic layer to achieve high magnetic permeability while maintaining structural stability at reduced thickness, resolving the contradiction between magnetic performance and thickness limitations.
2Length of stationary object
If a composite soft magnetic layer containing metal powder and polymer resin is used, then thickness can be reduced, but magnetic permeability decreases
Solution Approach 1:
The patent creates a composite soft magnetic layer combining ferrite particles with a polymer resin matrix. The ferrite provides magnetic properties while the polymer enables thin-film formation. By optimizing the dispersion and concentration of ferrite particles within the polymer matrix, the invention achieves both reduced thickness and maintained magnetic permeability, resolving the contradiction between these two parameters.
3Reliability
If a metal ribbon is used as soft magnetic layer, then high magnetic permeability and magnetic flux density are achieved, but eddy current loss increases
Solution Approach 1:
The patent segments the continuous metal ribbon structure into discrete ferrite particles distributed within an insulating polymer matrix. This segmentation interrupts the eddy current paths that would form in a continuous metal ribbon, significantly reducing eddy current losses. Meanwhile, the ferrite particles maintain the necessary magnetic permeability and flux density, resolving the contradiction between magnetic performance and energy loss.
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 allows for a slim, high-efficiency wireless power transfer system with improved magnetic permeability and reduced eddy current loss, enabling efficient power transfer in wireless charging applications.
Implementation Method 1
a soft magnetic material may be disposed around a transmitting antenna and a receiving antenna so that electromagnetic energy radiated by the transmitting antenna can be focused in a direction of the receiving antenna
Implementation Method 2
a coil which is laminated on the soft magnetic layer and configured to receive electromagnetic energy radiated from a wireless power transmitting apparatus
Data Source
AI summary
A wireless power receiving apparatus which wirelessly charges power according to one embodiment of the present invention includes a substrate, a soft magnetic layer which is laminated on the substrate and is formed with a plurality of patterns including at least 3 lines radiated from predetermined points, and a coil which is laminated on the soft magnetic layer and receives electromagnetic energy radiated from a wireless power transmitting apparatus.