Multilayer Ceramic Capacitor Poling Process Vibration Reduction
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Solution Overview
Problem
Multi-layer ceramic capacitors generate audible vibrations due to their piezoelectric characteristics, leading to noise and reliability issues, and existing solutions either compromise installation density or are limited to packaged configurations.
Innovation Solution
A multi-layer capacitor design where all dielectric layers are poled in the same direction, perpendicular to the inner electrode layers, to offset piezoelectric effects, reducing vibration and noise through controlled electric field application and outer electrode configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If two multi-layer ceramic capacitors are installed up and down to prevent vibration, then vibration and noise are reduced, but installation density of the printed circuit board is lowered
Solution Approach 1:
The dielectric material is divided into multiple dielectric layers, each with piezoelectric characteristics. By segmenting the single capacitor into multiple layers with opposite poling directions, the vibration is internally compensated without needing additional capacitors, thus maintaining installation density while reducing noise
Solution Approach 2:
Multiple dielectric layers with opposite piezoelectric effects are merged into a single capacitor structure. The opposite poling directions of adjacent dielectric layers create opposing vibrations that cancel each other out, achieving vibration reduction within one capacitor unit rather than requiring separate compensating capacitors
2Object-affected harmful factors
If a plurality of multi-layer ceramic capacitors is packaged using an insulative flexible substrate to absorb vibration, then vibration and noise are reduced, but it is practical only when multiple capacitors are used and limits installation flexibility
Solution Approach 1:
The vibration compensation function is extracted from the packaging structure and integrated directly into the capacitor's dielectric material structure. By incorporating opposite poling directions within the dielectric layers themselves, the capacitor becomes self-compensating, eliminating the need for special packaging or flexible substrates and restoring installation flexibility
Solution Approach 2:
The capacitor structure itself provides vibration compensation through its internal dielectric layer configuration. The opposite poling directions of the dielectric layers create self-canceling piezoelectric effects, making the capacitor self-sufficient for vibration reduction without requiring external packaging or additional components
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
This approach effectively reduces vibration and noise in a single capacitor, improving reliability and installation density without requiring dual capacitors or specific packaging, and can be applied to both individual and multiple capacitors.
Implementation Method 1
the piezoelectric coefficient generates vibration of an audible frequency band in a substrate, in which the multi-layer ceramic capacitor is installed, by converting electrical signals into mechanical signals
Data Source
AI summary
The present invention relates to a multi-layer capacitor. The multi-layer capacitor of the present invention includes a main body formed by alternately stacking a plurality of dielectric layers and a plurality of inner electrode layers, in which all the plurality of dielectric layers are poled in a same direction; a cover layer for covering and protecting the main body from outside; and outer electrodes electrically connected to the inner electrode layers to apply voltage to the inner electrode layers. Since deformation is offset overall in the multi-layer capacitor of the present invention, the piezoelectric effect occurs in an opposite direction in each of adjacent dielectric layers due to the poling process, and thus the present invention has an effect of reducing vibration and noise.