Multilayer Ceramic Capacitor Layout for Capacitance and Breakdown Balance
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving a balance between capacitance and breakdown voltage while maintaining reliability and compact size, with existing methods complicating manufacturing through adjustments to internal electrode layers and multilayer body shapes.
Innovation Solution
A multilayer ceramic capacitor design featuring a multilayer body with specific dimensions and structural elements, including dielectric layers with a BaTiO3 composition, internal electrode layers with Ni and Sn segregation, and side gap portions, optimized for dimensional constraints and enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radius of curvature of the corners of internal electrode layers and the radius of curvature of the ridges of the multilayer body are adjusted to decrease withstand voltage failure and increase capacitance, then reliability and capacitance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the dimensional ratios L0/T0 and W0/T0 within specific ranges (1.5≤L0/T0<2.5 and 0.8≤W0/T0≤1.6) to achieve both high reliability and capacitance without modifying the radius of curvature of internal electrode layers or multilayer body ridges, thereby avoiding increased manufacturing complexity
Solution Approach 2:
The patent applies local quality by introducing side gap portions with specific dimensional relationships (0.2≤WS/TG≤0.5) at localized regions of the multilayer body, allowing capacitance and reliability optimization through controlled local structural modifications rather than global shape changes
2Adaptability or versatility
If the size of the multilayer ceramic capacitor is reduced to meet dimensional constraints in miniaturized devices, then adaptability is improved, but capacitance and reliability may deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing specific dimensional ratio ranges (L0/T0 and W0/T0) that maintain optimal electrical performance and reliability even when the overall size of the capacitor is reduced to meet dimensional constraints in miniaturized devices
Solution Approach 2:
The patent applies dimensionality change by introducing side gap portions and optimizing the relationship between length, width, and thickness dimensions, allowing the capacitor to achieve high capacitance and reliability in a compact form factor suitable for miniaturized devices
3Adaptability or versatility
If the size of the multilayer ceramic capacitor is reduced to meet dimensional constraints in miniaturized devices, then adaptability is improved, but capacitance may deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing dimensional ratios (L0/T0 and W0/T0) to maximize capacitance within reduced size constraints, and by controlling side gap portion dimensions (WS/TG ratio) to enhance effective capacitance in the compact structure
Solution Approach 2:
The patent applies dimensionality change by strategically designing side gap portions and optimizing the three-dimensional arrangement of internal electrode layers, enabling increased capacitance density in miniaturized devices through efficient space utilization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design ensures sufficient reliability and balance between capacitance and breakdown voltage, allowing for compact size and high performance in devices with dimensional limitations, while simplifying manufacturing processes.
Implementation Method 1
each of the dielectric layers includes Ba and Ti
Data Source
AI summary
A multilayer ceramic capacitor includes dielectric layers including Ba and Ti, and internal electrode layers including Ni. A dimension L0 in a length direction, a dimension T0 in a lamination direction, and a dimension W0 in a width direction satisfy 1.7≤L0/T0≤2.3 and 1.0≤W0/T0≤1.4. Adjacent ends of the internal electrode layers have a positional deviation of about 5 μm or less in the width direction. Segregation of Sn with an atomic composition percentage of about 2 at % or higher occurs at an interface between the internal electrode layer and the dielectric layer. A dimension of each side gap portion in the width direction is WS, a dimension of each outer layer portion in the lamination direction is TG, and 0.3≤WS/TG≤0.6. For each internal electrode layer, a dimension in the width direction is WI, and T0<WI.