Multilayer Chip Capacitor Configurable Outer Electrodes ESR
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Solution Overview
Problem
Existing multilayer chip capacitors lack user-adjustable equivalent series resistance (ESR) characteristics, requiring users to select capacitors based on pre-defined manufacturer settings, which limits flexibility in meeting specific application requirements.
Innovation Solution
A multilayer chip capacitor design with a configurable outer electrode structure allows users to adjust ESR by selecting and connecting specific outer electrodes to a power source, enabling customizable ESR characteristics during mounting on a printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ESR value of the multilayer chip capacitor is lower than a required level, then the impedance at series resonance frequency is excessively lowered, but the impedance peak at parallel resonance frequency increases due to equivalent series inductance
Solution Approach 1:
The patent changes the electrical resistance parameter of outer electrodes to adjust ESR. By forming some outer electrodes with a material having higher electrical resistance than others, the patent enables precise control of ESR values while maintaining stable impedance characteristics across different frequency ranges.
2Manufacturing precision
If outer electrodes are made with highly resistant material to adjust ESR, then ESR characteristics improve, but localized heat spots are caused by current concentration phenomenon due to pin holes
Solution Approach 1:
The patent applies local quality by making only some outer electrodes (not all) have high electrical resistance. Specifically, first outer electrodes are formed with high resistance material while second outer electrodes use conventional materials, thereby achieving ESR adjustment without causing localized heat concentration.
3Manufacturing precision
If inner electrodes are made of high resistant material to adjust ESR, then ESR characteristics improve, but the material of inner electrodes must be continuously altered to match ceramic material for high capacity
Solution Approach 1:
The patent extracts the ESR adjustment function from the inner electrodes and assigns it to outer electrodes instead. By making outer electrodes (not inner electrodes) have high electrical resistance, the patent achieves ESR control without affecting the material compatibility between inner electrodes and ceramic layers.
4Manufacturing precision
If manufacturer modifies electrode structure to achieve desired ESR, then ESR characteristics are optimized, but user flexibility to adjust ESR according to specific application needs is lost
Solution Approach 1:
The patent makes the ESR characteristics dynamically adjustable by the user through selective electrode connection during circuit board mounting. By providing multiple outer electrodes with different resistance characteristics, the patent enables users to select and connect specific electrodes to achieve desired ESR values for different application requirements.
5Reliability
If user selects individual products based on pre-defined ESR settings, then specific ESR requirements are met, but selection flexibility and customization for various application conditions are limited
Solution Approach 1:
The patent segments the outer electrodes into multiple groups (first outer electrodes with high resistance, second outer electrodes with conventional resistance) that can be independently connected. This segmentation enables users to select specific electrode combinations during mounting to achieve customized ESR characteristics for different application conditions.
Data Source
AI summary
A multilayer chip capacitor includes: a capacitor main body; a plurality of first and second inner electrodes; and m (m≧3) number of first and second outer electrodes. The plurality of first and second inner electrodes are connected with two outer electrodes positioned on both opposing surfaces and having the same polarity as that of the first and second inner electrodes, and classified into a plurality of groups depending on the locations of the outer electrodes connected to the first and second inner electrodes. At least one of two outer electrodes connected with inner electrodes of each group is different from an outer electrode connected with inner electrodes of a different group having the same polarity, and inner electrodes of one group are connected to outer electrodes connected with at least another one group so that all the inner electrodes belonging to the same polarity can be electrically connected.