Laminated Varistor Electrode Layout for Lower Stray Capacitance
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Solution Overview
Problem
Conventional laminated varistors experience variations in capacitance due to stray capacitance between internal and external electrodes, which is influenced by the thickness or shape of the external electrode, leading to inconsistencies when used in small electronic devices.
Innovation Solution
A laminated varistor design featuring a sintered body with specific electrode configurations, including first and second internal electrodes electrically connected to external electrodes, forming varistor regions that reduce stray capacitance by positioning these regions closer to one side surface, thereby minimizing capacitance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external electrode is made thicker or larger in area to improve electrical connection, then the electrical conductivity is improved, but the stray capacitance between internal electrode and external electrode increases
Solution Approach 1:
The patent introduces a third external electrode arranged in a direction different from the conventional two-electrode configuration. This spatial arrangement in multiple dimensions allows the internal electrode to be positioned such that it overlaps with varistor regions but minimizes overlap with external electrodes, thereby reducing stray capacitance while maintaining electrical connection quality.
Solution Approach 2:
The patent creates different functional regions within the internal electrode: a first region overlapping with varistor regions for electrical connection, and a second region arranged away from external electrodes to minimize stray capacitance. This local differentiation of electrode functions resolves the contradiction between connection quality and capacitance reduction.
2Volume of moving object
If the varistor size is reduced to meet miniaturization requirements, then the device size is reduced, but the capacitance variation becomes more significant
Solution Approach 1:
By arranging three external electrodes in different spatial directions and positioning the internal electrode to overlap primarily with varistor regions rather than external electrodes, the patent reduces stray capacitance contributions. This dimensional arrangement stabilizes capacitance characteristics even in miniaturized varistors.
Solution Approach 2:
The patent uses multiple varistor regions (first, second, and third varistor regions) that can be configured to provide consistent electrical characteristics. This redundancy through multiple regions helps stabilize overall capacitance performance against variations.
3Stability of the object's composition
If two varistors are combined as one element to reduce capacitance difference, then the capacitance matching is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple varistor regions (first, second, and third varistor regions) within a single element structure, each contributing to the overall capacitance. This internal combination of multiple functional regions within one element achieves capacitance stability without requiring separate paired varistor elements, thereby reducing overall device complexity.
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 effectively reduces stray capacitance and its variations, ensuring more consistent performance when used in pairs, particularly in small electronic devices.
Implementation Method 1
capacitance occurs between two internal electrodes facing each other exhibiting varistor performance, and also stray capacitance occurs between the internal electrode and another external electrode
Data Source
AI summary
It is aimed to provide a laminated varistor capable of reducing stray capacitance to occur between an internal electrode and an external electrode, and also capable of reducing a variation in the stray capacitance due to a variation in the external electrode. A laminated varistor of the present disclosure has external electrodes on first end surface, second end surface, and first side surface of sintered body. No external electrode is provided on second side surface opposite to first side surface. Varistor regions in which internal electrodes overlap each other in a laminating direction are provided at positions closer to second side surface than to first side surface.