Multilayer Ceramic Capacitor Buffer Region Design

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Solution Overview

Problem

Conventional multilayer ceramic electronic components face challenges in achieving high withstand voltage properties due to the limitations of dielectric layer thickness, where a thick ceramic buffer layer can reduce the active portion's thickness and capacitance, while a thin buffer layer is insufficient for high voltage applications.

Innovation Solution

A multilayer ceramic electronic component design that includes a ceramic body with a dielectric layer and internal electrodes, where a buffer region is strategically placed between internal electrodes to satisfy the relation 0<tb<150 μm+td, optimizing the thickness of the buffer region and dielectric layer to enhance breakdown voltage and withstand voltage properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the dielectric layer is made thin to reduce component size, then the component becomes compact, but the withstand voltage property deteriorates

Engineering Contradiction:

Improvecomponent sizeVSAvoidwithstand voltage property

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The dielectric layer is segmented into multiple thin dielectric layers stacked in series, each contributing to the total breakdown voltage. This allows the overall component to maintain compact size while achieving high withstand voltage through the cumulative effect of multiple layers

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses composite dielectric structures combining multiple dielectric materials or layers with different properties to achieve both thin overall thickness for compactness and high breakdown voltage for reliability

Inventive Principle:

Principle #40Composite materials

2Reliability

If the ceramic buffer layer is made thick to improve withstand voltage, then the breakdown voltage increases, but the active portion thickness is reduced leading to decreased capacitance

Engineering Contradiction:

Improvebreakdown voltageVSAvoidcapacitance

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The buffer region is segmented into multiple thin buffer layers distributed at strategic positions between dielectric layers, providing cumulative protection against breakdown while minimizing the total thickness consumed by buffer material

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Buffer layers are placed locally at specific positions where they are most needed for breakdown protection, rather than uniformly distributing buffer material throughout, thus optimizing the balance between reliability and capacitance

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11017953B2Multilayer ceramic electronic component

Publication Date: 2021.05.25 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A multilayer ceramic electronic component includes: a ceramic body having a dielectric layer, and a plurality of first and second internal electrodes facing each other with the dielectric layer interposed therebetween; and first and second external electrodes disposed on an outer surface of the ceramic body, respectively. The ceramic body includes an active portion including a plurality of internal electrodes facing each other with the dielectric layer interposed therebetween to form capacitance, and cover portions formed on upper and lower portions of the active portion. A buffer region is disposed between at least one pair of first and second internal electrodes among the plurality of first and second internal electrodes disposed inside the active portion, and satisfies the relation 0<tb<150 μm+td, where td is a thickness of the dielectric layer, and tb is a thickness of the buffer region.