Variable Width Spiral Wiring Coil Assembly for Wireless Power
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Solution Overview
Problem
Existing coil assemblies in portable terminals are bulky and inefficient due to the uniform width of their spiral wiring, leading to increased line loss and eddy currents during wireless power charging.
Innovation Solution
A coil assembly design featuring spiral wiring with a narrower inner section and a wider outer section, where the inner section's line width is 20% or more of the outer section's line width, and the number of turns in the inner section is 75% or less of the total turns, to reduce line loss and eddy currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If uniform width spiral wiring is used in coil assembly, then manufacturing is simple, but line loss and eddy currents increase reducing wireless transmission efficiency
Solution Approach 1:
The patent applies local quality by varying the line width of the spiral wiring along its length. The inner section has a narrower line width while the outer section has a wider line width, optimizing current distribution and reducing eddy currents in different regions of the coil assembly, thereby reducing overall energy loss.
Solution Approach 2:
The spiral wiring is segmented into distinct sections with different line widths. The inner section and outer section are designed with different widths to optimize performance, creating a segmented structure that balances manufacturing complexity with energy efficiency.
2Loss of energy
If narrower inner section wiring is used, then eddy currents are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality variations in the spiral wiring with the inner section having a narrower line width (P2) and the outer section having a wider line width (P1). This localized differentiation reduces eddy currents while maintaining manufacturability through defined width ratios (0.2*P1≤P2).
3Productivity
If more turns are placed in inner section, then coil efficiency improves, but space constraints are violated increasing assembly size
Solution Approach 1:
The patent optimizes the spatial distribution of wire turns by varying the line width dimension. The narrower inner section allows for optimized turn density without increasing the radial dimension, while the wider outer section provides necessary current carrying capacity, achieving high efficiency within compact constraints.
Solution Approach 2:
Different sections of the spiral wiring are assigned different line widths to optimize turn distribution. The inner section with narrower width (P2) and outer section with wider width (P1) create optimal current paths that improve transmission efficiency while maintaining compact coil assembly dimensions.
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 enhances wireless transmission efficiency and reduces eddy current generation, achieving comparable or improved efficiency while minimizing the coil assembly's size and material usage.
Implementation Method 1
The coil wiring may be configured to transmit and receive power for wireless charging
Implementation Method 2
A coil assembly design featuring spiral wiring with a narrower inner section and a wider outer section, where the inner section's line width is 20% or more of the outer section's line width, and the number of turns in the inner section is 75% or less of the total turns, to reduce line loss and eddy currents
Data Source
AI summary
A coil assembly includes: a substrate; and a coil wiring coupled to the substrate and including a spiral wiring and a lead wiring, wherein the spiral wiring includes a first section forming an outer portion of the spiral wiring and a second section, disposed inside the first section, and having a line width narrower than a line width of the first section.