Multilayer Capacitor Dielectric Zoning for Breakdown Reliability

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Solution Overview

Problem

Multilayer capacitors face challenges in achieving high capacitance while minimizing the concentration of electric fields on internal electrode ends, which can lead to insulating breakdown and reduced reliability.

Innovation Solution

The design includes a multilayer capacitor with internal electrodes alternately disposed with dielectric layers, where the dielectric constant of the active region is different from that of the margin and cover regions, optimizing the distribution of electric fields and reducing concentration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the thickness of a multilayer capacitor is reduced to decrease its size, then the capacitance per unit volume increases, but the electric field concentration on internal electrode ends intensifies causing insulating breakdown and degraded reliability

Engineering Contradiction:

Improvesize of multilayer capacitorVSAvoidreliability of multilayer capacitor

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent applies local quality by creating distinct regions with different dielectric constants within the capacitor body. The active region has a first dielectric constant while the margin region has a second dielectric constant, allowing different functional zones to optimize for either capacitance or electric field management locally

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the dielectric constant parameter spatially within the capacitor structure. By varying the dielectric constant from the active region to the margin region, the patent modifies the electric field distribution to reduce concentration at critical points while maintaining overall capacitor performance

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If the area of internal electrodes is increased to enhance capacitance, then the capacitance value increases, but the electric field concentration on the interfacial surface between active region and margin portion intensifies

Engineering Contradiction:

Improvecapacitance of multilayer capacitorVSAvoidelectric field concentration on interfacial surface

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent creates a margin region with distinct dielectric properties adjacent to the active region. This local differentiation allows the interface between regions to manage electric field transitions smoothly, preventing concentration at the boundaries while maintaining large electrode area for high capacitance

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The margin region acts as an intermediary zone between the active electrode region and the external environment. This intermediate region with different dielectric constant mediates the electric field distribution, preventing direct concentration at the sharp interfaces between electrodes and external surfaces

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enhances capacitance while alleviating electric field concentration, thereby improving the reliability and preventing breakdown voltage issues in multilayer capacitors.

Implementation Method 1

an electric field may be intensely formed on ends of an internal electrode when voltage is applied, and the concentration of an electric field may cause insulating breakdown

Methodology Applied

Scientific EffectElectric field: Electric Field

Implementation Method 2

the active region, the second region, and the fourth region have a same dielectric constant A, and the first region and the third region have a same dielectric constant B, and A and B are different from each other

Methodology Applied

Scientific EffectDielectric constant: Dielectric Permittivity

Data Source

PatentUS12205772B2Multilayer capacitor and substrate including the same mounted thereon

Publication Date: 2025.01.21 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A multilayer capacitor includes a capacitor body having an active region, upper and lower cover regions, and width margins on opposing sides of the active region. The width margin includes a first region on an internal side thereof adjacent the first and second internal electrodes and a second region on an external side between the first region and a respective external surface of the capacitor body, and the upper and lower cover regions each include a third region on an internal side thereof adjacent the internal electrodes and a fourth region on an external side between the third region and a respective external surface of the capacitor body. The active region, the second region, and the fourth region have a same dielectric constant A, and the first and third regions have a same dielectric constant B, and A and B are different from each other and satisfy 0.5≤B/A.