Multilayer Coil Layout for Low DC Resistance and Heat Suppression
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Solution Overview
Problem
Multilayer coil components face structural defects and increased DC resistance due to conductor thickness increases, leading to current concentration and temperature elevation near connecting portions.
Innovation Solution
A multilayer coil component design featuring parallel and series connections between coil conductor groups via coupling and connecting conductors, with the connecting conductors having a larger cross-sectional area and strategically positioned to reduce current concentration and heat generation, while maintaining a reduced DC resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of the coil conductor is increased to decrease DC resistance, then the DC resistance decreases, but structural defects such as cracks occur
Solution Approach 1:
The coil conductor is divided into multiple thin conductor layers (first coil conductor and second coil conductor) stacked in the thickness direction, connected in parallel through coupling conductors. This segmentation allows achieving low DC resistance through increased effective cross-sectional area without increasing the thickness of individual conductors, thereby avoiding structural defects like cracks.
2Loss of energy
If the thickness of the coil conductor is increased to decrease DC resistance, then the DC resistance decreases, but current concentration occurs near connecting portions
Solution Approach 1:
The coil conductor is segmented into multiple parallel paths (first coil conductor and second coil conductor connected through coupling conductors), which distributes the current flow across multiple pathways and reduces current concentration at any single connecting portion.
Solution Approach 2:
The coupling conductors are designed with specific cross-sectional areas (at least twice as large as the coil conductor cross-sectional area) to locally enhance current distribution capability at critical connecting portions, preventing current concentration while maintaining overall low DC resistance.
3Loss of energy
If the thickness of the coil conductor is increased to decrease DC resistance, then the DC resistance decreases, but temperature elevation occurs near connecting portions
Solution Approach 1:
The coil conductor is divided into multiple parallel conductors connected through coupling conductors, distributing heat generation across multiple pathways and reducing temperature elevation at any single location.
Solution Approach 2:
The coupling conductors are designed with larger cross-sectional areas to locally improve heat dissipation capability at connecting portions, preventing temperature elevation while maintaining low overall DC resistance.
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 effectively suppresses heat generation and reduces DC resistance while preventing structural defects by distributing current flow evenly and avoiding concentration at connecting points.
Implementation Method 1
concentration of electric current occurs in regions near a first connecting portion and near a second connecting portion, possibly resulting in temperature elevation and defects
Data Source
AI summary
A multilayer coil component includes a multilayer body that includes insulating layers that are stacked; a coil disposed in the multilayer body; and outer electrodes disposed on surfaces of the multilayer body and electrically connected to the coil. The coil includes at least two coil conductor groups that each include at least two coil conductors connected to each other in parallel through two coupling conductors. The at least two coil conductor groups are connected to each other in series through a connecting conductor. The connecting conductor connects the coil conductor between the two coupling conductors in one of the at least two coil conductor groups to the coil conductor between the two coupling conductors in another one of the at least two coil conductor groups.