Multilayer Ceramic Capacitor Temperature Compensation Design
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Solution Overview
Problem
Downsizing multilayer ceramic capacitors while maintaining desirable temperature characteristics is challenging, as reducing their size often compromises temperature compensation performance.
Innovation Solution
A multilayer ceramic capacitor design with a ceramic multilayer structure featuring alternately stacked dielectric and internal electrode layers, where the ratio of internal electrode volume to ceramic structure volume is regulated to satisfy the condition 300×TE/TA−12≤30, ensuring desirable temperature characteristics and moisture resistance, and a manufacturing method that alternately stacks green sheets and forms external electrodes to achieve this ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the multilayer ceramic capacitor is downsized in the analogous shape, then the size is reduced, but the temperature characteristic deteriorates
Solution Approach 1:
The invention changes the geometric parameters of the capacitor by introducing a protrusion structure that increases the effective volume of internal electrodes without increasing the overall external dimensions. This allows the capacitor to maintain desirable temperature characteristics (CG or CH characteristics) even in a downsized package by optimizing the volume ratio of internal electrodes to ceramic body.
Solution Approach 2:
The invention adds a dimensional feature (protrusion) to the internal electrodes that extends in the thickness direction, thereby increasing the effective volume of internal electrodes without increasing the planar area. This dimensional change enables improved temperature characteristics while maintaining a compact overall size.
2Quantity of substance
If the volume ratio of internal electrodes to ceramic body is increased, then the electrical capacity is enlarged, but the sintering quality deteriorates
Solution Approach 1:
The invention segments the internal electrode structure into a main body portion and a protrusion portion. This segmentation allows the protrusion to be formed with optimized dimensions that increase the effective electrode volume for higher capacity, while the main body portion maintains appropriate proportions for good sintering quality and mechanical strength.
Solution Approach 2:
The invention applies local quality by creating a protrusion structure at specific locations of the internal electrodes. This localized structural modification increases the effective volume of internal electrodes in the capacity region without requiring a uniform increase throughout the entire electrode structure, thereby improving capacity while maintaining sintering quality in critical areas.
Data Source
AI summary
A multilayer ceramic capacitor includes: a ceramic multilayer structure having a structure in which each of ceramic dielectric layers and each of internal electrode layers are alternately stacked and are alternately exposed to two edge faces of the ceramic multilayer structure, a main phase of the plurality of ceramic dielectric layers having a perovskite structure that includes Ca and Zr and is expressed by a general formula ABO3; and a pair of external electrodes that are formed on the two edge faces, wherein 300×TE/TA−12≤30 is satisfied when a volume TA is a length CL×a width CW×a thickness CT of the ceramic multilayer structure and a volume TE is a length EL×a width EW×a thickness ET×a stacked number of the plurality of internal electrode layers in a capacity region.