Series Capacitor Structure to Prevent Electric Field Short Circuits
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Solution Overview
Problem
Capacitors with a single capacitance forming part are prone to short circuits due to electric field concentration, leading to impaired functionality.
Innovation Solution
A capacitor design featuring two capacitance forming parts with discontinuous conductive films and a partitioned structure, connected in series through external connection lines, to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single capacitance forming part is used, then the device complexity is reduced, but the reliability deteriorates due to electric field concentration causing short circuits
Solution Approach 1:
The capacitance forming part is divided into multiple independent capacitance elements (first capacitance element, second capacitance element, etc.), each with its own metal porous body, dielectric film, and conductive film. These segmented elements are arranged in series between the external connection lines, distributing the electric field and preventing concentration-induced short circuits, thereby improving reliability while maintaining manageable structural complexity.
2Reliability
If the conductive film is continuous, then the electrical conductivity is improved, but the reliability worsens due to increased risk of short circuits under electric field concentration
Solution Approach 1:
The conductive film is segmented into multiple discrete conductive films, each covering respective dielectric films of different capacitance elements. These segmented conductive films are arranged in series connection rather than being continuous, which distributes the electric field stress and prevents short circuits while maintaining necessary electrical conductivity through the series arrangement.
3Reliability
If capacitance forming parts are arranged in parallel, then the capacitance value is increased, but the reliability worsens due to electric field concentration in each part
Solution Approach 1:
Multiple capacitance elements are segmented and arranged in series connection between the external connection lines. This series arrangement increases the overall withstand voltage capability of the capacitor while distributing the electric field across each element, preventing electric field concentration and improving reliability.
Solution Approach 2:
The capacitance elements are arranged in a spatial configuration along the direction between external connection lines, creating a multi-dimensional structure that distributes electric field stress. This dimensional arrangement allows achieving both high capacitance value and high reliability by combining multiple elements in series.
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 improves the reliability of capacitors by preventing short circuits and enhancing withstand voltage, effectively addressing the issue of electric field concentration.
Implementation Method 1
a first dielectric film covering a surface of the first metal porous body; and a second dielectric film covering a surface of the second metal porous body
Implementation Method 2
a first conductive film covering the first dielectric film; and a second conductive film covering the second dielectric film
Implementation Method 3
a first capacitance forming part including: a first metal porous body having conductivity; a first dielectric film covering a surface of the first metal porous body; and a first conductive film covering the first dielectric film
Data Source
AI summary
A capacitor that includes: an insulating substrate; first and second capacitance forming parts; a first external connection line, and a second external connection line. The second capacitance forming part is located on a side opposite to the first external connection line as viewed from the first capacitance forming part. The second capacitance forming part is electrically connected to the first external connection line with the first capacitance forming part interposed therebetween, and the first capacitance forming part is electrically connected to the second external connection line with the second capacitance forming part interposed therebetween, so that at least the first capacitance forming part and the second capacitance forming part are electrically connected in series between the first external connection line and the second external connection line.