Multilayer Varistor Electrode Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
Existing multilayer varistors experience variations in electrostatic capacitance and parasitic capacitance between external electrodes, leading to potential migration and reduced performance in applications like two-wire differential voltage transmission.
Innovation Solution
A multilayer varistor design with increased distances between external electrodes, formed using a roller application method, reduces parasitic capacitance and variations in electrostatic capacitance by positioning electrodes on the sintered body's surface except for end portions, enhancing bonding strength and reducing overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If external electrodes are disposed close to each other on the sintered body surface, then the device size is reduced, but parasitic capacitance between electrodes increases and electrostatic capacitance variations occur
Solution Approach 1:
The patent transitions from planar electrode arrangement to three-dimensional positioning by disposing electrodes on multiple surfaces (end faces and side faces) of the sintered body. This spatial distribution in multiple dimensions increases the effective distance between electrodes while maintaining a compact overall device volume, thereby reducing parasitic capacitance without significantly increasing device size.
Solution Approach 2:
The patent divides the electrode arrangement into segmented positions on different surfaces of the sintered body. Instead of concentrating all electrodes on one surface, they are segmented across end faces and side faces, which separates the electric fields between electrodes and reduces mutual capacitance coupling.
2Volume of moving object
If external electrodes overlap on the sintered body surface, then the device size is reduced, but electrostatic capacitance variations between varistors increase
Solution Approach 1:
The patent eliminates overlap by distributing electrodes across multiple dimensions - placing them on end faces and side faces rather than concentrating them on a single surface. This multi-dimensional arrangement ensures that electrodes do not overlap when viewed from any direction, maintaining uniform electrostatic capacitance while keeping the device compact.
Solution Approach 2:
The patent employs asymmetric electrode positioning where electrodes are strategically placed on different surfaces (end faces versus side faces) rather than symmetrically on the same surface. This asymmetric distribution prevents overlap and ensures uniform electrical characteristics across all varistors in the multilayer structure.
Data Source
AI summary
A sintered body has a first end face and a second end face opposite to each other in a first direction and a first side face and a second side face opposite to each other in a second direction. A first end face electrode is disposed on the first end face except for end portions of the first end face in the second direction. A second end face electrode is disposed on the second end face except for end portions of the second end face in the second direction. A first side face electrode is disposed on the first side face except for end portions of the first side face in the first direction. A second side face electrode is disposed on the second side face except for end portions of the second side face in the first direction.