Multilayer Ceramic Capacitor Insulating Layer Reduces Acoustic Noise
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with short circuits between internal electrodes due to cutting stress and generate acoustic noise during voltage application, which affects their reliability and performance.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with alternating internal electrodes and an insulating layer on the side surface, where the second blocks are positioned above and below the first block to prevent short circuits and reduce acoustic noise, with specific thickness ratios for the blocks and an insulating layer made of materials like epoxy, heat-resistant polymer, or glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of dielectric layers are laminated to achieve ultra-high capacitance, then capacitance increases, but the risk of short circuit between internal electrodes increases due to cutting stress
Solution Approach 1:
An insulating layer is introduced as an intermediary between adjacent internal electrodes that extend to the side surface. This insulating layer prevents direct contact between electrodes under cutting stress, thereby eliminating the short circuit pathway while preserving the high capacitance achieved through multiple dielectric layers.
Solution Approach 2:
The insulating layer is pre-applied to the side surface of the ceramic body before final assembly, creating a protective barrier in advance. This beforehand cushioning ensures that when cutting stress occurs during mounting, the electrodes are already protected from potential short circuits, maintaining reliability without sacrificing capacitance.
2Ease of operation
If internal electrodes are extended to the side surface for mounting, then ease of mounting improves, but acoustic noise is generated during voltage application
Solution Approach 1:
The insulating layer acts as a mediator between the extended internal electrodes and the external environment. It allows the electrodes to extend to the side surface for easy mounting while simultaneously suppressing acoustic noise generation during voltage application by providing electrical isolation and damping.
3Device complexity
If internal electrodes are exposed to the side surface for lead-out, then device complexity is reduced, but moisture resistance deteriorates
Solution Approach 1:
A thin film insulating layer is applied to the side surface, creating a flexible protective barrier that covers the exposed internal electrodes. This thin film structure maintains the simplified electrode configuration for easy lead-out while providing effective moisture resistance protection.
Data Source
AI summary
There is provided a multilayer ceramic electronic component, including: a ceramic body having first and second main surfaces, first and second side surfaces, and first and second end surfaces; a first block including first and second internal electrodes having overlap regions which form a capacitance part; one or more second blocks each including third and fourth internal electrodes having overlap regions which form a capacitance part; a first external electrode connected to the first and third lead out portions and a second external electrode connected to the second and fourth lead out portions; and an insulating layer formed on the first side surface of the ceramic body, wherein the second blocks are disposed on upper and lower parts of the first block.