Asymmetric Spiral Coil Layout for Aligned Wireless Power Transfer
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Solution Overview
Problem
Existing coil components for wireless power transmission experience reduced power transmission efficiency when the center axes of the power transmission and reception coils are aligned.
Innovation Solution
A coil component with a substrate and a spiral-shaped first coil pattern, where the outer and inner shapes are wider in one direction than the other, and the inner shape ratio is greater than the outer shape ratio, enhancing magnetic coupling even when coils are aligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coil component uses a laterally-elongated power transmission coil to allow power transmission when positions are misaligned, then adaptability to misaligned positions is improved, but power transmission efficiency when center axes are aligned deteriorates
Solution Approach 1:
The patent applies asymmetry by making the inner shape ratio larger than the outer shape ratio in the lateral direction. This creates an asymmetric magnetic field distribution that simultaneously improves adaptability to misaligned positions while maintaining high power transmission efficiency when centered, resolving the technical contradiction between these two opposing requirements.
Solution Approach 2:
The patent applies local quality by creating different shape ratios at different regions of the coil - the inner shape has a larger lateral width ratio than the outer shape. This local differentiation allows the coil to optimize magnetic coupling characteristics for both aligned and misaligned positions, improving adaptability without sacrificing efficiency.
2Adaptability or versatility
If the outer and inner shapes are larger in width in the first direction than the second direction, then adaptability to lateral misalignment is improved, but power transmission efficiency when aligned deteriorates
Solution Approach 1:
The patent resolves this contradiction by introducing asymmetry in the shape ratios - while both outer and inner shapes are elongated in the first direction for misalignment adaptability, the inner shape ratio is made larger than the outer shape ratio. This asymmetric relationship optimizes magnetic coupling for aligned positions while maintaining lateral adaptability.
Solution Approach 2:
The patent applies parameter changes by specifically controlling the shape ratios of the outer and inner shapes. By setting the inner shape ratio larger than the outer shape ratio, the patent optimizes the magnetic field distribution parameters to achieve both lateral adaptability and high power transmission efficiency when aligned.
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 coil component maintains high power transmission efficiency both when the coils are aligned and when they are misaligned, ensuring consistent magnetic coupling across various positional relationships.
Implementation Method 1
a coil component that can be used for a wireless power transmission apparatus
Data Source
AI summary
Disclosed herein is a coil component that includes a coil pattern provided on the substrate. The outer and inner shapes of the coil pattern are both larger in width in a first direction than a second direction. The outer shape of the coil pattern has a pair of first outer shape sections and a second outer shape section positioned between the pair of first outer shape sections in the first direction and having a width in the second direction larger than that of the first outer shape sections. The inner shape of the coil pattern has a pair of first inner shape sections and a second inner shape section positioned between the pair of first inner shape sections in the first direction and having a width in the second direction larger than that of the first inner shape sections.