Noncontact Power-Transmission Coil Magnetic Layer Formation
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Solution Overview
Problem
Existing noncontact power-transmission coils for portable terminals, such as mobile phones, face challenges in reducing thickness while maintaining efficient power transmission, as conventional magnetic sheets used for adhesion and magnetic path formation can increase thickness and reduce efficiency.
Innovation Solution
A planar coil magnetic layer formation method involving a magnetic solution with magnetic particles in a binder solvent is applied to cover both planar and side-face portions of the coil, enhancing adhesion and magnetic flux linkage without the need for thick adhesive sheets, allowing for thinner coil designs and improved power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick adhesive sheet is used to affix the magnetic sheet to the planar coil, then the adhesion between the planar coil and magnetic sheet is enhanced, but the thickness of the noncontact power-transmission coil increases
Solution Approach 1:
The invention changes the physical state of the adhesive from a thick elastic sheet to a thin magnetic adhesive layer, transforming the adhesive properties while reducing thickness. The magnetic adhesive layer maintains sufficient adhesion strength through its magnetic properties rather than relying on thick elastic material.
Solution Approach 2:
The invention uses a composite structure combining a magnetic sheet with a thin magnetic adhesive layer. This composite material approach allows the magnetic sheet to be firmly attached to the planar coil while minimizing the overall thickness, as the magnetic adhesive layer provides both adhesion and magnetic flux path functionality.
2Reliability
If a magnetic sheet is affixed to the planar coil using a thick adhesive sheet, then a magnetic path is formed, but the power-transmission efficiency is reduced due to increased thickness
Solution Approach 1:
The invention changes the adhesive from a thick non-magnetic material to a thin magnetic adhesive layer, fundamentally altering the magnetic properties of the assembly. This allows the magnetic flux to pass through the adhesive layer with minimal resistance, maintaining power-transmission efficiency while forming a reliable magnetic path.
Solution Approach 2:
The invention replaces the mechanical adhesion system (thick elastic adhesive sheet) with a magnetic adhesion system (thin magnetic adhesive layer). This substitution eliminates the need for thick mechanical bonding material while maintaining both adhesion strength and magnetic flux path continuity, thereby preserving power-transmission efficiency.
3Length of moving object
If the adhesive sheet is made thin to reduce coil thickness, then the thickness of the noncontact power-transmission coil is reduced, but the adhesive properties become insufficient and the magnetic sheet may separate
Solution Approach 1:
The invention creates a composite material system where the thin magnetic adhesive layer combines both adhesive and magnetic properties. The magnetic particles in the adhesive layer provide additional bonding strength through magnetic attraction, compensating for the reduced thickness and ensuring the magnetic sheet remains firmly attached to the planar coil.
Solution Approach 2:
The thin magnetic adhesive layer serves multiple functions simultaneously: it provides mechanical adhesion between the magnetic sheet and planar coil, forms a continuous magnetic flux path, and maintains structural integrity. This multi-functionality allows the thin layer to compensate for its reduced thickness by performing multiple critical roles.
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 approach enables the creation of thinner noncontact power-transmission coils with enhanced power transmission efficiency, reducing the thickness of portable terminals and simplifying assembly processes by forming a stable magnetic path that adheres closely to the coil surfaces.
Implementation Method 1
the counter surface of each coil, which is opposite to the surface facing to the other coil, is entirely covered with a magnetic sheet to prevent undesired radiation with the magnetic field generated from both coils
Implementation Method 2
charging power to charge a rechargeable battery incorporated within a portable terminal, for example, has been transmitted by electromagnetic induction using a noncontact power-transmission coil
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
A noncontact power-transmission coil is provided. The noncontact power-transmission coil includes a planar coil and a magnetic layer. The planar coil is formed by winding a linear conductor in a spiral shape substantially in a single plane. The magnetic layer is formed by applying a liquid-form magnetic solution in which magnetic particles are mixed with a binder solvent, so as to cover one planar portion of the planar coil and a side-face portion of the planar coil.