Planar Spiral Coil Layout for Uniform Wireless Power Fields
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Solution Overview
Problem
The existing coil components used in wireless power transmission devices have a large difference in magnetic field strength among peripheral direction positions, particularly in the opening area where the magnetic field is strongest, leading to inefficiencies in power transmission.
Innovation Solution
A coil component with a substrate and a planar spiral coil pattern, where the inner shape has a higher circularity than the outer shape, is designed to enhance magnetic field uniformity and expand the range of the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a coil component with width larger than height is used for power transmission, then power transmission efficiency is improved with displacement tolerance, but magnetic field strength uniformity in the opening area deteriorates
Solution Approach 1:
The patent applies asymmetry by making the inner shape circularity higher than the outer shape circularity. This asymmetric design allows the magnetic field to be more uniform in the opening area (improved field uniformity) while maintaining the overall width-larger-than-height configuration for displacement tolerance (maintained power transmission efficiency).
Solution Approach 2:
The patent applies local quality by differentiating the circularity requirements between the inner shape and outer shape. The inner shape is designed with higher circularity to improve magnetic field uniformity in the opening area, while the outer shape maintains the width-larger-than-height aspect ratio for power transmission efficiency and displacement tolerance.
2Manufacturing precision
If the coil pattern has high outer shape circularity, then magnetic field distribution uniformity is improved, but power transmission efficiency with displacement tolerance deteriorates
Solution Approach 1:
The patent applies asymmetry by creating a deliberate difference between inner shape circularity and outer shape circularity. The outer shape maintains lower circularity (width > height) to ensure displacement tolerance and power transmission efficiency, while the inner shape has higher circularity to improve magnetic field distribution uniformity in the opening area.
Solution Approach 2:
The patent applies local quality by assigning different circularity characteristics to different parts of the coil pattern. The outer shape prioritizes power transmission efficiency with width-larger-than-height configuration, while the inner shape prioritizes magnetic field uniformity with higher circularity.
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 design achieves enhanced magnetic coupling and uniformity of the magnetic field, allowing for efficient wireless power transmission even with displacement of the power reception coil, while reducing losses and improving DC resistance.
Implementation Method 1
a planar spiral coil pattern provided on the surface of the substrate. The coil pattern has a circularity higher in its inner shape than in its outer shape
Data Source
AI summary
Disclosed herein is a coil component that includes a substrate, and a planar spiral coil pattern provided on the surface of the substrate. The coil pattern has a circularity higher in its inner shape than in its outer shape.