Multilayer Ceramic Capacitor Mounting Structure ESR Adjustment
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Solution Overview
Problem
Existing multilayer ceramic capacitors face a trade-off between equivalent series resistance (ESR) and capacitance, where reducing the number of internal electrodes to increase ESR results in lower capacitance.
Innovation Solution
A mounting structure for multilayer ceramic capacitors is designed where the first, third, and fourth external electrodes are bonded to the mounting substrate, while the second external electrode is not, allowing for adjustment of ESR without compromising capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the number of laminated internal electrodes is reduced to increase ESR, then ESR is improved, but capacitance deteriorates
Solution Approach 1:
The capacitor is divided into two distinct functional regions: a first laminate portion with a higher number of internal electrodes for capacitance, and a second laminate portion with a lower number of internal electrodes for ESR control. This segmentation allows each region to independently optimize its electrical characteristics without compromising the other.
Solution Approach 2:
Different regions of the capacitor are assigned different electrode densities to achieve different local electrical properties. The first laminate portion has high electrode density for capacitance, while the second laminate portion has low electrode density for ESR, creating local quality variations that resolve the global contradiction.
2Adaptability or versatility
If the number of laminated internal electrodes is reduced to adjust ESR, then ESR is adjusted, but capacitance is lowered
Solution Approach 1:
The capacitor structure is segmented into two laminate portions with different electrode configurations, enabling independent optimization of ESR and capacitance. The first portion maintains high electrode count for capacitance while the second portion has reduced electrodes for ESR adjustment.
Solution Approach 2:
The solution moves from a single-dimensional approach (uniform electrode distribution) to a multi-dimensional approach by introducing a spatial dimension with varying electrode densities across different laminate portions, allowing simultaneous optimization of multiple electrical parameters.
Data Source
AI summary
A mounting structure of a multilayer ceramic capacitor includes a multilayer ceramic capacitor and a mounting substrate on which the multilayer ceramic capacitor is mounted. The multilayer ceramic capacitor includes a laminate including a plurality of dielectric layers and a plurality of internal electrodes alternately laminated, and a first external electrode, a second external electrode, a third external electrode, and a fourth external electrode provided on a surface of the laminate. The plurality of internal electrodes include a first internal electrode, a second internal electrode, and a third internal electrode. The first external electrode, the third external electrode, and the fourth external electrode are bonded to the mounting substrate, and current is not directly supplied from the mounting substrate to the second external electrode.