High-Voltage Capacitor Layout to Suppress Interconductor Discharge
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Solution Overview
Problem
High voltage capacitors face reliability issues due to high interconductor electric field strength, leading to dielectric breakdown, particularly at discharge points along the inner surfaces of through-holes.
Innovation Solution
A high voltage capacitor design featuring a pair of capacitors with columnar element bodies, where the first and second electrodes are positioned on opposing sides, and a common conductor surrounds these capacitors, increasing the distance between conductors and reducing the interconductor electric field strength. This design is encapsulated in an insulating case with resin sealing to prevent discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional high voltage capacitor with through-holes is used, then the structure is simple, but the interconductor electric field strength is high causing dielectric breakdown and reduced reliability
Solution Approach 1:
The invention divides the capacitor into multiple capacitor units (first capacitor unit and second capacitor unit) with separate element bodies. Each unit has its own electrodes and is positioned independently, allowing the conductors to be spaced apart and reducing the interconductor electric field strength, thereby improving reliability while maintaining a manageable structure
Solution Approach 2:
The invention positions the first and second capacitor units in different spatial locations with their electrodes facing each other in the second direction, creating a three-dimensional arrangement. This spatial separation increases the distance between conductors with different potentials, reducing electric field strength without significantly increasing overall device complexity
2Reliability
If the distance between conductors is increased to reduce interconductor electric field strength, then reliability improves, but the device size increases
Solution Approach 1:
The capacitor units are arranged in a three-dimensional configuration where electrodes face each other in the second direction while the element bodies are positioned at different locations. This spatial arrangement increases the effective distance between conductors with different potentials without proportionally increasing the overall device volume, as the separation is achieved through strategic positioning rather than uniform expansion
Solution Approach 2:
The invention applies different spatial arrangements to different parts of the capacitor structure. The first and second capacitor units are positioned with their electrodes facing each other, creating localized regions of reduced electric field strength where critical breakdown would occur, while maintaining compact overall dimensions through optimized local geometry
Data Source
AI summary
A high voltage capacitor includes a pair of capacitors; a common conductor, and a pair of individual conductors. Each of the pair of capacitors includes an element body having a columnar shape with a first direction as an axial direction, and including a first side surface and a second side surface facing away each other in a second direction orthogonal to the first direction, a first electrode disposed on the first side surface and electrically connected to a corresponding individual conductor of the pair of individual conductors; and a second electrode disposed on the second side surface and electrically connected to the common conductor. The pair of capacitors is disposed in such a way that the first electrodes face each other in the second direction. The common conductor surrounds the pair of capacitors and the pair of individual conductors when viewed from the first direction.