Varistor Electrode Layout for Stray Capacitance Reduction
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Solution Overview
Problem
Conventional varistor components generate stray capacitance due to external and internal electrodes, leading to variations in capacitance values that can affect the operation of electronic devices.
Innovation Solution
A varistor component design with specific electrode placement, where external electrodes are not positioned on certain lateral surfaces and internal electrodes are symmetrically arranged to minimize capacitance differences between varistor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external electrodes and internal electrodes are provided on multiple lateral surfaces of the varistor-material sintered body, then the varistor component can achieve proper electrical connectivity and terminal functions, but stray capacitance is generated between these electrodes which causes capacitance variations and affects device operation
Solution Approach 1:
The patent extracts and removes electrodes from specific positions (third and fourth lateral surfaces) where they would generate harmful stray capacitance. By selectively eliminating electrodes from these surfaces while maintaining necessary electrical connectivity through remaining electrodes on first and second lateral surfaces, the invention reduces stray capacitance between electrodes without compromising the varistor component's functional connectivity requirements.
Solution Approach 2:
The patent applies asymmetric electrode distribution by placing electrodes on specific lateral surfaces (first and second) while deliberately omitting them from other surfaces (third and fourth). This asymmetric arrangement optimizes the electrical field distribution to minimize stray capacitance generation while maintaining proper terminal functions, breaking the symmetry that would otherwise create equal stray capacitance across all surfaces.
2Ease of manufacture
If the varistor component uses a conventional electrode arrangement on all lateral surfaces, then manufacturing and assembly are simplified, but capacitance variations occur due to stray capacitance which may affect electronic device operation
Solution Approach 1:
The patent applies local quality by making different lateral surfaces have different electrode configurations. Specifically, the first and second lateral surfaces have electrodes provided on them, while the third and fourth lateral surfaces have no electrodes. This localized differentiation optimizes each surface's contribution to either electrical connectivity or stray capacitance reduction, achieving precise capacitance control while maintaining manufacturability.
Data Source
AI summary
A varistor component includes: a varistor-material sintered body; a first external electrode provided on a portion of a first lateral surface; a second external electrode provided on a portion of the first lateral surface; and a third external electrode provided on a portion of a second lateral surface. The first external electrode, the second external electrode, and the third external electrode are not provided on a third lateral surface or a fourth lateral surface. The first external electrode and the second external electrode are spaced apart from each other in a first direction on the first lateral surface. The third external electrode provided on the second lateral surface is located between the first external electrode and the second external electrode, when viewed in a second direction.