Multilayer Inductor Coil Layout for Uniform DC Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multilayer inductors exhibit differences in DC resistance and/or inductance values between coil conductors due to variations in shape and wiring length.
Innovation Solution
The multilayer inductor design includes a plurality of magnetic layers laminated in a specific direction, with coils formed by connecting conductors through vias, and external electrodes provided on the bottom surface. The conductors are arranged in a single layer with identical areas and alternately disposed in a direction intersecting the lamination direction, ensuring similar coil shapes and wiring lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coil conductors are disposed in different layers with different shapes and wiring lengths, then the inductor can accommodate varied design requirements, but the DC resistance and inductance values differ between conductors
Solution Approach 1:
The patent applies local quality by making specific adjustments to conductor configurations in certain layers. Different conductor shapes and wiring lengths are intentionally designed in specific locations to achieve target DC resistance and inductance values for each coil, while maintaining overall uniformity through controlled variations rather than complete uniformity across all conductors.
Solution Approach 2:
The patent changes physical parameters of the conductor configurations, including shape, wiring length, and layer positioning, to optimize the electrical characteristics. By adjusting these parameters locally in different layers, the design achieves both adaptability for varied requirements and controlled uniformity in the final electrical performance.
2Reliability
If coil conductors have different shapes and wiring lengths, then specific electrical characteristics can be achieved, but the DC resistance and inductance values become non-uniform
Solution Approach 1:
The patent implements local quality by allowing specific conductor variations in particular layers to achieve target electrical characteristics, while controlling the overall uniformity through systematic design. The different shapes and wiring lengths are purposefully introduced in specific locations rather than uniformly across all conductors.
Solution Approach 2:
The patent modifies conductor parameters such as shape, length, and positioning to achieve reliable electrical characteristics. These parameter changes are strategically applied to balance the need for specific electrical performance with the requirement for uniform DC resistance and inductance values across the inductor.
3Manufacturing precision
If conductors are arranged in a single layer with identical areas, then uniformity of electrical properties is improved, but design flexibility is reduced
Solution Approach 1:
The patent reconciles uniformity and flexibility by maintaining identical conductor areas in the single layer for uniformity, while achieving design flexibility through variations in other parameters such as conductor positioning, layer stacking patterns, and connection configurations. This allows different electrical characteristics to be achieved without varying the fundamental conductor area.
Solution Approach 2:
The patent moves the design flexibility to another dimension by maintaining uniform conductor areas in the planar dimension while achieving variety through three-dimensional arrangements, including different layer positions, stacking sequences, and connection topologies. This preserves manufacturing precision while enabling design adaptability.
Data Source
AI summary
A multilayer inductor includes an element body including magnetic layers laminated in a lamination direction, a first, second, third and fourth external electrodes on a bottom surface of the element body, a first coil including a first winding portion formed by connecting, through vias, end portions of first conductors in different layers of the element body, a first through-conductor that connects one end of the first winding portion that is relatively close to the bottom surface and the first external electrode to each other, and a second through-conductor that connects the other end of the first winding portion that is relatively away from the bottom surface and the second external electrode to each other, and a second coil including a second winding portion.