Multilayer Inductor Asymmetric Coil Design
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Solution Overview
Problem
Multilayer inductors experience a reduction in resonant frequency due to increased stray capacitance caused by coil conductors being connected in parallel and opposed to external electrodes, leading to a lower current capacity.
Innovation Solution
The electronic component features a multilayer body with coil conductors not connected to external electrodes paired and connected in parallel, while at least one coil conductor connected to an external electrode is not paired with an identical shape, reducing stray capacitance and maintaining high current capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If coil conductors are connected in parallel to increase current capacity, then current capacity is improved, but stray capacitance increases and resonant frequency decreases
Solution Approach 1:
The patent applies asymmetry by making at least one coil conductor connected to an external electrode have a different shape from its paired conductor. Specifically, when one conductor has a semicircular arc shape, its paired conductor has a different arc shape rather than being identical. This asymmetric design reduces the overlapping area between opposed coil conductors, thereby minimizing stray capacitance and preventing resonant frequency reduction while maintaining the parallel connection structure for current capacity.
2Loss of energy
If coil conductors with identical shapes are paired and connected in parallel, then direct-current resistance decreases and current capacity increases, but the sum of opposed areas increases and resonant frequency is reduced
Solution Approach 1:
The patent resolves this contradiction by introducing asymmetric shapes for at least one pair of coil conductors connected to external electrodes. While maintaining the parallel connection topology that reduces DC resistance, the asymmetric geometry reduces the overlapping area between opposed conductors, thereby minimizing stray capacitance effects and preserving resonant frequency.
Solution Approach 2:
The patent applies local quality by differentiating the shapes of coil conductors based on their position and function. Conductors not connected to external electrodes maintain identical shapes for optimal DC resistance, while at least one conductor connected to an external electrode has a different shape to minimize stray capacitance. This localized differentiation optimizes both DC resistance and resonant frequency characteristics.
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 configuration effectively prevents reductions in resonant frequency and enhances current capacity by minimizing stray capacitance effects, as demonstrated by a higher resonant frequency in simulation models.
Implementation Method 1
a plurality of coil conductors laminated together with the insulating layers, the coil conductors forming a coil
Implementation Method 2
stray capacitances occur between the coil conductors 104a to 104d and the external electrodes
Data Source
AI summary
A multilayer body is formed by laminating multiple insulating layers. External electrodes are provided on the opposed side surfaces of the multilayer body and extend in the z axis direction. Coil conductors are laminated together with the insulating layers and form a coil. Coil conductors other than coil conductors connected to the external electrodes are made up of pairs of adjacent coil conductors having an identical shape, and coil conductors forming each pair are connected in parallel to each other. None of the coil conductors connected to the external electrodes is connected in parallel to coil conductors with an identical shape.