Multilayer Inductor Coil Structure for Ampacity
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Solution Overview
Problem
Conventional multilayer chip inductors are susceptible to short-circuiting due to metal migration between coil patterns, limiting their ampacity due to proximity and potential differences between conductors connected in series.
Innovation Solution
The electronic component features a laminate with helically wound coil conductors connected by via-conductors, where neighboring coil conductors with an insulator layer in between do not overlap except for parallel sections, preventing conductor proximity and potential differences, thus inhibiting metal migration and short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coil patterns are connected in series with one ferrite green sheet between them, then the inductor can be constructed with fewer layers, but metal migration occurs between the coil patterns causing short-circuiting
Solution Approach 1:
The patent introduces a ground pattern as an intermediary conductive layer between the series-connected coil patterns. This ground pattern acts as a mediator that provides a reference potential and prevents direct metal migration between the coil patterns, thereby resolving the short-circuiting issue while maintaining the reduced layer structure
Solution Approach 2:
The ground pattern is connected to a reference potential (typically ground), creating an equipotential region between the series-connected coil patterns. This equipotential barrier prevents potential difference-driven metal migration, allowing the coil patterns to be closely spaced without causing short-circuits
2Area of stationary object
If coil patterns are placed in proximity to reduce size, then the inductor occupies less space, but the potential difference between adjacent coil patterns causes metal migration
Solution Approach 1:
The ground pattern serves as a protective intermediary layer inserted between adjacent coil patterns that carry different potentials. This intermediary ground layer physically separates the conductive paths and provides a safe reference potential zone, preventing metal ions from migrating between the high-potential coil patterns while allowing them to be placed in close proximity
Solution Approach 2:
The patent converts the potentially harmful effect of adjacent coil patterns with different potentials into a beneficial structure by introducing ground patterns. The ground patterns, which would normally be considered additional complexity, actually protect against metal migration and enable closer spacing of the functional coil patterns, thus reducing the overall footprint
Data Source
AI summary
An electronic component having a laminate having a plurality of insulator layers. A coil is provided consisting of a plurality of coil conductors that are connected by via-conductors piercing through the insulator layers, the coil winding helically about an axis along a direction of lamination. External electrodes are provided on surfaces of the laminate, in which at least some pairs of the coil conductors that neighbor each other with one of the insulator layers provided therebetween have parallel sections that overlap each other when viewed in the direction of lamination. The parallel sections are connected in parallel by the via-conductors or the external electrodes, and each pair of the coil conductors that neighbor each other with one of the insulator layers provided therebetween do not overlap each other when viewed in the direction of lamination, except for the parallel sections, and connections between the coil conductors and the via-conductors.