Coil Component ESD Resistance via Insulating Substrate
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Solution Overview
Problem
Existing coil components lack sufficient Electro-Static Discharge (ESD) resistance, particularly against high transient voltages, leading to potential insulation breakdown.
Innovation Solution
A coil component design featuring an element body with magnetic material and resin, including insulating substrates and exposed insulators that cover the entire width of the end surfaces, preventing direct contact between external terminals and the element body, thereby enhancing ESD resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is formed between the external terminal and the element body, then insulation is provided, but insulation breakdown may occur under high transient voltage
Solution Approach 1:
The patent introduces an insulating substrate as an intermediary component positioned between the external terminal and the element body. This insulating substrate extends through the element body and is exposed at the end surfaces, creating a physical barrier that prevents direct contact and reduces the risk of insulation breakdown under high transient voltage conditions.
Solution Approach 2:
The insulating substrate is configured to extend in the thickness direction of the element body, utilizing the third dimension to provide enhanced insulation. By exposing the insulating substrate at the end surfaces and forming insulating layers on specific regions, the patent creates a multi-dimensional insulation structure that effectively blocks transient voltage paths.
2Reliability
If the insulating substrate is exposed at the end surfaces, then ESD resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating substrate serves multiple functions simultaneously: it provides electrical insulation between the external terminal and element body, extends through the element body to block transient voltage paths, and is exposed at end surfaces to prevent direct contact. This multi-functional design improves ESD resistance without requiring additional separate insulating components.
Solution Approach 2:
The patent combines the insulating substrate with the element body structure, where the insulating substrate is embedded within and extends through the element body. This integration merges the insulating function with the structural framework, reducing the need for separate insulating components and simplifying the overall device structure.
Data Source
AI summary
In the coil component, the external terminal and the metal magnetic powder-containing resin constituting the element body are not in direct contact with each other, and thus high ESD resistance is obtained. That is, even when a high transient voltage is applied between the pair of external terminals, insulation breakdown is less likely to occur, and an improvement in breakdown voltage with respect to the transient voltage can be realized.