Multilayer Capacitor Step Compensation for Margin Breakdown Risk
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Solution Overview
Problem
The miniaturization and slimming of multilayer capacitors lead to reduced reliability and increased likelihood of dielectric breakdown and short circuit faults, particularly at the interface between internal electrodes and margin portions.
Innovation Solution
A multilayer capacitor design featuring first and second internal electrodes exposed through specific surfaces, with step-compensating portions on margin portions to reduce the step difference between internal electrodes and margin areas, enhancing reliability and capacity by maximizing the surface area of overlap and using materials like BaTiO3-based ceramic powder for dielectric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of dielectric layers and internal electrodes is reduced to achieve miniaturization and increased capacity, then the capacity and miniaturization are improved, but the reliability decreases and the likelihood of dielectric breakdown and short circuit faults increases
Solution Approach 1:
The patent applies local quality by creating step-compensating portions with different thicknesses at specific locations (margin portions) versus the center of the capacitor body. The step-compensating portions have a first thickness at the center and a second thickness (greater than the first) at the margin portions, providing localized reinforcement where dielectric breakdown is most likely to occur while maintaining thin overall dimensions for high capacity and miniaturization.
2Length of stationary object
If the thickness of margins and covers is reduced to achieve slimming, then the slimming is improved, but the reliability decreases and the likelihood of dielectric breakdown and short circuit faults increases
Solution Approach 1:
The patent implements local quality by varying the thickness of step-compensating portions within the margin portions. The step-compensating portions have a first thickness at the center and a second thickness (greater than the first) at the margin portions, providing localized reinforcement exactly where needed to prevent dielectric breakdown while maintaining overall slim dimensions.
3Quantity of substance
If thin dielectric layers and internal electrodes are used to achieve highly laminated products, then the capacity is significantly increased, but the reliability decreases and the likelihood of dielectric breakdown and short circuit faults increases
Solution Approach 1:
The patent applies local quality by creating step-compensating portions with different thicknesses at specific locations (margin portions) versus the center of the capacitor body. The step-compensating portions have a first thickness at the center and a second thickness (greater than the first) at the margin portions, providing localized reinforcement where dielectric breakdown is most likely to occur while maintaining thin overall dimensions for high capacity and miniaturization.
4Reliability
If faults occur at the interface with margin portions, then the reliability decreases, but adding reinforcement at these interfaces increases the complexity of the structure
Solution Approach 1:
The patent applies preliminary action by incorporating step-compensating portions during the manufacturing process that proactively prevent dielectric breakdown before it occurs. These portions are formed as integral parts of the capacitor structure during lamination, addressing potential failure points at margin portions before they can cause faults, rather than adding separate reinforcement components.
Data Source
AI summary
A multilayer capacitor and a board having the same mounted thereon are provided. The multilayer capacitor includes a capacitor body including dielectric layers and first and second internal electrodes, and first to sixth surfaces, the first internal electrode being exposed through the third surface and the fifth surface and the second internal electrode being exposed through the fourth surface and the sixth surface; first and second side portions disposed on the fifth and sixth surfaces, respectively, of the capacitor body; first and second external electrodes; a first step-compensating portion disposed on a margin portion in a width direction on the second dielectric layer on which the second internal electrode is formed on the first internal electrode; and a second step-compensating portion disposed on another margin portion in the width direction on the first dielectric layer on which the first internal electrode is disposed on the second internal electrode.