Planar Coil Layout With Split Inner Turns for Lower AC/DC Resistance
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Solution Overview
Problem
Existing coil components with spiral-shaped planar conductors face challenges in reducing DC resistance and AC resistance due to non-uniform current density distribution, and the arrangement of connection conductors is limited, especially when dividing turns into multiple lines.
Innovation Solution
The coil component design includes two spiral coil parts with their innermost turns divided into multiple lines by spiral-shaped slits, where the angular distances of these lines differ, allowing for distributed connection conductor layout and connection between lines with varying angular distances to maintain uniform current density distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the conductor width of the planar conductor is increased to reduce DC resistance or AC resistance, then the resistance decreases, but the non-uniformity in distribution of current density increases
Solution Approach 1:
The innermost peripheral turn of the coil is divided into a plurality of lines by a spiral-shaped slit, creating multiple parallel current paths. This segmentation allows current to distribute more uniformly across the conductor cross-section while maintaining a wide overall conductor width for low resistance.
2Manufacturing precision
If a separate connection conductor is provided for each line to make the current density more uniform, then the current density uniformity improves, but the connection conductors are concentrated on one position making the layout difficult
Solution Approach 1:
The inner peripheral ends of the plurality of divided lines are short-circuited and connected together as a single unified connection point. This merging approach maintains uniform current density distribution across all lines while eliminating the complexity of arranging multiple separate connection conductors at different positions.
Data Source
AI summary
Disclosed herein is an apparatus that includes a substrate having first and second surfaces opposite to each other, a first coil pattern formed on the first surface of the substrate, and a second coil pattern formed on the second surface of the substrate. The first coil pattern includes first and second lines, and the second coil pattern includes third and fourth lines. The first line is greater in a number of turn than the second line, and the third line is greater in a number of turn than the fourth line. The first line is connected to the fourth line, and the third line is connected to the second line.