Multilayer Ceramic Capacitor Electrode Structure for Low DC Resistance
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Solution Overview
Problem
Multilayer through-type capacitors face challenges in reducing DC resistance while maintaining lower capacitance and ensuring secure connectivity between internal and external electrodes, as reducing the number of internal electrodes increases DC resistance and may compromise connectivity.
Innovation Solution
A multilayer ceramic capacitor design with a larger number of first internal electrode layers and a specific configuration of second internal electrode layers, where the extending sections are thicker than the central sections, to enhance connectivity and reduce DC resistance without increasing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of internal electrodes is reduced to lower capacitance, then capacitance is reduced, but DC resistance increases
Solution Approach 1:
The internal electrodes are segmented into two distinct types: first internal electrodes extending in the length direction and second internal electrodes extending in the width direction. This segmentation allows independent optimization of each electrode type's configuration and number, enabling capacitance reduction while maintaining adequate DC resistance through the first internal electrodes' extended paths
Solution Approach 2:
Different regions of the capacitor have different electrode configurations: the first internal electrodes provide long-length conduction paths for low DC resistance, while the second internal electrodes provide width-direction connectivity for capacitance formation. This local differentiation allows the first internal electrodes to primarily handle DC resistance requirements even when their number is reduced
2Quantity of substance
If the number of ground electrodes is reduced to lower capacitance, then capacitance is reduced, but connectivity between internal and external electrodes deteriorates
Solution Approach 1:
The second internal electrodes extend in the width direction (transverse dimension) rather than only in the length direction. This dimensional change creates additional connection paths between internal electrodes and external electrodes on side surfaces, maintaining connectivity even when the number of electrodes is reduced
Solution Approach 2:
The second internal electrodes are positioned to extend from central sections through extending sections to side surfaces, creating nested connection paths that link internal electrode layers to external electrodes. This nesting ensures multiple connection points are maintained even with fewer electrodes
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body, a first internal electrode layer extending to opposing end surfaces of the multilayer body, a second internal electrode layer extending to opposing side surfaces of the multilayer body, first and second external electrodes connected to the first internal electrode layer and provided on the opposing end surfaces, and third and fourth external electrodes connected to the second internal electrode layer and provided on the opposing side surfaces. The second internal electrode layer includes a central section in a central portion of the dielectric layer and an extending section extending to the opposing side surfaces. The first internal electrode layer is larger in number than the second internal electrode layer, at least two first internal electrode layers are successively layered, and the extending section is larger in thickness than the central section located in the central portion of the dielectric layer.