Film Capacitor Surface Particle Segmentation for Dielectric Strength
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Solution Overview
Problem
Film capacitors face challenges in achieving a balance between high slipperiness for improved handleability and high dielectric breakdown voltage, as excessive adhesiveness between film surfaces can hinder self-healing functions and the presence of particles inside the film reduces breakdown voltage.
Innovation Solution
A film capacitor design featuring a resin layer with particles only on the surface, rather than inside, to enhance slipperiness while maintaining high dielectric breakdown voltage, achieved by attaching particles to the resin-solution-coating surface of a base material film and transferring them to the resin layer during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If particles are attached to the film surface to improve slipperiness, then the slipperiness of the film is improved, but the dielectric breakdown voltage is reduced due to particles serving as impurities inside the film
Solution Approach 1:
The patent segments the particle distribution into two distinct zones: particles on the surface for slipperiness and particles excluded from the interior for dielectric strength. This spatial segmentation resolves the contradiction by allowing surface particles to provide slipperiness while preventing internal particles from reducing breakdown voltage.
Solution Approach 2:
The patent applies local quality by creating different particle concentration characteristics in different regions of the film. The surface region has high particle concentration for slipperiness, while the interior region has low or zero particle concentration for maintaining dielectric breakdown voltage. This localized differentiation resolves the contradiction between surface and bulk requirements.
2Reliability
If the surface of the film is smooth, then the dielectric breakdown voltage is maintained, but the friction coefficient increases and handleability is poor
Solution Approach 1:
The patent segments the film structure into surface and bulk regions with different properties. The surface contains particles for low friction and good handleability, while the bulk remains particle-free for high dielectric breakdown voltage. This segmentation allows both contradictory requirements to be satisfied in their respective regions.
Solution Approach 2:
The patent implements local quality by providing particle-containing surfaces for operational ease while maintaining particle-free interiors for electrical reliability. This localized property differentiation enables the film to exhibit both low friction coefficient and high dielectric breakdown voltage simultaneously.
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 film capacitor with improved slipperiness and high dielectric breakdown voltage, ensuring effective self-healing and operational efficiency by minimizing particle presence inside the resin layer.
Implementation Method 1
transferring the particles from the resin-solution-coating surface of the base material film to a surface of the resin layer by peeling the resin layer off the base material film
Data Source
AI summary
A film capacitor that includes a resin layer which has a first surface and a second surface and in which there are particles on at least one of the first surface and the second surface; and a metal layer on the first surface of the resin layer, wherein there are more particles in number on the at least one of the first surface and the second surface of the resin layer than inside the resin layer.