Series-Connected Porous Substrate Capacitor for High Voltage
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Solution Overview
Problem
Conductive polymer capacitors with thin dielectric layers for high electrostatic capacitance have low withstand voltage and are prone to destruction, making them unsuitable for applications requiring high reliability and safety, especially when connected in series due to polarity issues.
Innovation Solution
A capacitor design featuring a conductive porous substrate with multiple electrostatic capacitance forming sections connected in series, where the dielectric layer is formed on the substrate and upper electrodes are formed on the dielectric layer, allowing for non-polar operation and enhanced withstand voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dielectric layer is made thinner to increase electrostatic capacitance, then the electrostatic capacitance is improved, but the withstand voltage deteriorates and the capacitor becomes more prone to destruction
Solution Approach 1:
The capacitor is divided into multiple electrostatic capacitance forming sections (first section with first dielectric layer and first upper electrode, second section with second dielectric layer and second upper electrode) connected in series. This segmentation allows the total voltage to be distributed across multiple dielectric layers, increasing the overall withstand voltage while maintaining high electrostatic capacitance through the series configuration.
2Reliability
If a plurality of capacitors are connected in series to improve fail-safe operation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Multiple electrostatic capacitance forming sections are merged into a single integrated capacitor element, where the sections share common electrodes (the conductive porous substrate serves as both the lower electrode for the first section and the upper electrode for the second section). This merging achieves series connection for improved reliability while reducing structural complexity compared to discrete capacitors.
Solution Approach 2:
The conductive porous substrate serves multiple functions: it acts as the lower electrode for the first electrostatic capacitance forming section, the upper electrode for the second electrostatic capacitance forming section, and provides mechanical support for the dielectric layers. This multi-functionality reduces the number of separate components needed.
3Quantity of substance
If two or more electrostatic capacitance forming sections are formed on a base material with upper surfaces used as terminal electrodes, then the electrostatic capacitance is improved, but reverse voltage causes polarity issues and insufficient withstand voltage
Solution Approach 1:
Instead of using the upper surfaces of electrostatic capacitance forming sections as terminal electrodes (which causes reverse voltage issues), the invention uses the side surfaces or bottom surfaces of the base material as terminal electrodes. This inversion of the electrode configuration allows proper voltage application without reverse voltage damage to the dielectric layers.
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 solution provides a capacitor with high electrostatic capacitance, low equivalent series resistance (ESR), and fail-safe operation without polarity, ensuring reliability and safety by preventing short-circuiting even if one dielectric layer is destroyed.
Implementation Method 1
a first electrostatic capacitance forming section and a second electrostatic capacitance forming section which are electrically connected in series by the conductive porous substrate
Data Source
AI summary
A capacitor having a conductive porous substrate with at least two electrostatic capacitance forming sections, each of the at least two electrostatic capacitance forming sections including a porous portion of the conductive porous substrate, a dielectric layer on the porous portion, and an upper electrode on the dielectric layer. The at least two electrostatic capacitance forming sections are electrically connected in series by the conductive porous substrate.