Multilayered Ceramic Capacitor Asymmetric Electrode Arc Suppression
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Solution Overview
Problem
High voltage multilayered ceramic electronic components face challenges in reducing size while preventing arc generation due to increased voltage and reduced terminal spacing, leading to technical difficulties in miniaturization.
Innovation Solution
A multilayered ceramic electronic component design with specific dimensions and electrode configurations, including a ceramic main body with dielectric layers and internal electrodes, where the external electrodes are formed to satisfy a particular length ratio and thickness, and optionally include floating electrodes to prevent field concentration and enhance arc suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the multilayered ceramic electronic component is reduced, then the capacity per unit volume increases, but the interval between external electrode terminals decreases leading to increased arc generation
Solution Approach 1:
The external electrodes are designed with asymmetric length ratios where the shortest length A satisfies 0.5≦A/BW≦1.0, creating an optimized geometric configuration that prevents arc generation. This asymmetric design allows the electrodes to extend different distances from the end faces, optimizing the electric field distribution to prevent breakdown while maintaining compact dimensions.
Solution Approach 2:
The invention changes the geometric parameters of the external electrodes, specifically controlling the length ratio A/BW and the distance G between terminals. By optimizing these parameters within specific ranges, the component achieves both miniaturization and high arc resistance, transforming the relationship between size and reliability through parameter optimization.
2Quantity of substance
If the dielectric layer thickness is reduced to increase the number of laminated layers, then the capacity increases, but the withstand voltage capability decreases making arc prevention difficult
Solution Approach 1:
The invention shifts the focus from increasing capacitance through thickness to increasing it through optimized lateral electrode configuration. By controlling the length ratio and terminal distance in the lateral dimensions, the design achieves high capacitance while maintaining adequate withstand voltage capability, effectively using dimensional optimization to resolve the contradiction.
Solution Approach 2:
The external electrodes are designed with specific local geometric properties at the end faces, where the shortest length A and longest length BW create optimized electric field distribution. This local geometric quality control prevents field concentration that would lead to arc generation, allowing thin dielectric layers to maintain high breakdown strength.
3Length of moving object
If the interval between external electrode terminals is reduced for miniaturization, then the component size decreases, but the electric field intensity increases causing arc discharge
Solution Approach 1:
The asymmetric electrode design with controlled length ratio A/BW creates a non-uniform but optimized electric field distribution. This asymmetry prevents field concentration at specific points while maintaining the reduced terminal interval G/L, effectively managing electric field intensity throughout the structure to prevent arc discharge.
Solution Approach 2:
The invention optimizes the curved or rounded geometry of the external electrode ends, where the shortest length A is measured from the end face. This curved geometry design prevents sharp edges that would concentrate electric fields, thereby reducing field intensity and preventing arc generation even at reduced terminal intervals.
Data Source
AI summary
There is provided a multilayered ceramic electronic component including: a ceramic main body having a dielectric layer, the ceramic main body having a length of 1.79 mm or less and a width of 1.09 mm or less; first and second internal electrodes disposed to face each other with the dielectric layer interposed therebetween within the ceramic main body; and a first external electrode electrically connected to the first internal electrode and a second external electrode electrically connected to the second internal electrode, wherein, when it is defined that the shortest length of at least one of the first and second external electrodes, formed in the lengthwise direction from both end portions of the ceramic main body is A, and the longest length thereof is BW, a relational expression of 0.5≦A/BW<1.0 may be satisfied.