Coaxial Coil Layout for NFC and Wireless Power Inductance
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Solution Overview
Problem
Existing coil components with coaxial NFC and wireless power transmission coil patterns are limited by the outer diameter size of the wireless power transmission coil, restricting its performance characteristics.
Innovation Solution
A coil component design featuring first and second coaxial coil patterns with different numbers of turns and pattern widths, where the second coil pattern is positioned between the turns of the first coil pattern, allowing for a larger outer diameter and optimized inductance, and radially divided into multiple lines to reduce resistance and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coil pattern for wireless power transmission is disposed in the inner diameter portion of the coil pattern for NFC, then the two coil patterns can be coaxially formed on a substrate, but the outer diameter size of the wireless power transmission coil pattern is restricted to be less than the inner diameter size of the NFC coil pattern, which prevents sufficient improvement of wireless power transmission characteristics
Solution Approach 1:
The patent applies nesting by placing the wireless power transmission coil pattern (second coil pattern) inside the NFC coil pattern (first coil pattern), with the outer peripheral portion of the second coil pattern positioned between the turns of the first coil pattern. This nested arrangement allows both coil patterns to be coaxially formed on the substrate while enabling the second coil pattern to achieve a sufficient outer diameter size for improved wireless power transmission characteristics
2Length of stationary object
If the outer diameter size of the wireless power transmission coil pattern is increased, then wireless power transmission characteristics can be improved, but the coil patterns cannot be properly coaxially arranged when the wireless power transmission coil's outer diameter exceeds the NFC coil's inner diameter
Solution Approach 1:
The patent enables the second coil pattern to have an outer diameter larger than the inner diameter of the first coil pattern by nesting the outer peripheral portion of the second coil pattern between the turns of the first coil pattern. This maintains coaxial arrangement while allowing the second coil pattern to achieve the necessary outer diameter size for improved wireless power transmission characteristics
Solution Approach 2:
The patent utilizes the radial dimension between the turns of the first coil pattern to accommodate part of the second coil pattern. By extending the second coil pattern radially outward between the turns rather than strictly confining it within the inner diameter, the design achieves both coaxial arrangement and sufficient outer diameter size
3Power
If the number of turns of the second coil pattern is increased to increase inductance, then wireless power transmission performance is improved, but the DC resistance and AC resistance increase, causing heat generation
Solution Approach 1:
The patent applies local quality by radially dividing the second coil pattern into multiple lines with different pattern widths. The inner peripheral lines have smaller pattern widths while the outer peripheral lines have larger pattern widths, creating non-uniform current density distribution that reduces eddy current losses and heat generation while maintaining the required inductance
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 design enables sufficient outer diameter size for both coil patterns, improving wireless communication and power transmission characteristics by increasing inductance and reducing DC and AC resistance, while minimizing heat generation due to eddy current.
Implementation Method 1
a coil component having two coaxial coil patterns with different functions... first and second coil patterns coaxially formed on one surface of the substrate
Implementation Method 2
the turns constituting the second coil pattern may be radially divided into a plurality of lines by a spiral-shaped slit. This equalizes the density distribution of current flowing in the second coil pattern, thereby allowing reduction in a DC resistance and an AC resistance... reduce heat generation due to eddy current
Data Source
AI summary
Disclosed herein is a coil component that includes a substrate having a first surface, and first and second coil patterns coaxially formed on the first surface of the substrate and electrically isolated from each other. The first coil pattern has a plurality of turns including a first turn and a second turn. A predetermined turn of the second coil pattern is disposed between the first and second turns of the first coil pattern.