Asymmetric Coil Component Insulation Reliability
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Solution Overview
Problem
The existing coil components with magnetic portions and embedded coil conductors face insulation issues due to pressure-induced breakdown of insulating coatings, leading to low-resistance paths and potential short circuits, especially at high frequencies, which can reduce inductance and cause reliability problems.
Innovation Solution
The coil component design differentiates the height of the inner and outer side portions, with the outer side portion positioned higher than the inner side portion, ensuring increased distance between the conductor on the bottom surface and the winding portion, and uses a composite material with metal particles and resin for the magnetic portion, enhancing insulation and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the conductor on the bottom surface and the winding portion is increased to suppress short circuits, then insulation reliability is improved, but the height of the coil component inevitably increases
Solution Approach 1:
The patent applies asymmetry by differentiating the heights of the inner side portion and outer side portion of the coil conductor. The outer side portion is positioned at a height different from the inner side portion, creating an asymmetric structure that increases the distance between the bottom surface conductor and winding portion without uniformly increasing the overall component height. This asymmetric height differentiation allows insulation improvement while controlling the overall height dimension.
2Reliability
If insulating coating is applied to metal particles and coil conductor to ensure insulation, then insulation performance is improved, but the insulating coating is broken by pressure during compression molding, creating low-resistance paths
Solution Approach 1:
The patent applies beforehand cushioning by pre-positioning the coil conductor at a specific height within the magnetic portion before compression molding. The conductor is placed such that it is surrounded by the composite material, creating a protective cushioning effect that absorbs compression pressures and prevents damage to insulating coatings during the molding process. This prior positioning protects the coating integrity under pressure.
3Reliability
If the coil conductor is used at high frequency, then the impedance increases, but current passes through low-resistance paths instead of the coil conductor, causing short circuits and reduced inductance
Solution Approach 1:
The patent converts the potential harm of high-frequency operation into a benefit by using the increased impedance at high frequencies to redirect current flow. The asymmetric height structure is designed to work with high-frequency current characteristics, ensuring that when impedance increases, current is forced to follow the intended path through the coil conductor rather than seeking alternative low-resistance paths. This transforms the high-frequency impedance effect from a potential problem into a protective mechanism against short circuits.
Data Source
AI summary
A coil component includes a magnetic portion that includes metal particles and a resin material, a coil conductor embedded in the magnetic portion, and outer electrodes electrically connected to the coil conductor and disposed on the bottom surface of the coil component. The coil conductor is disposed such that the central axis is arranged in the height direction of the coil component, and a winding constituting the outermost layer of a winding portion of the coil conductor is located at a position higher than the position of a winding constituting the innermost layer.