Composite Multilayer Capacitor ESD Protection via Discharge Electrodes
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Solution Overview
Problem
Multilayer capacitors face challenges in resisting electrostatic discharge (ESD) and overcurrent due to short-circuits, which can lead to reduced capacitance, bending cracks, and acoustic noise, especially when mounted on boards, as increasing interlayer spacing or external electrode margins compromises capacitance and reliability.
Innovation Solution
A composite electronic component comprising a multilayer capacitor with internal and external electrodes, a high-rigidity chip with discharge electrodes, and a sealing part, where the discharge electrodes are connected to the external electrodes and include an ESD functional member to bypass ESD without altering the internal electrode design, thereby enhancing ESD durability and reducing acoustic noise while maintaining capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interlayer spacing between internal electrodes is increased to improve ESD resistance, then ESD durability is improved, but capacitance is reduced
Solution Approach 1:
The invention divides the ESD protection function into two separate components: the multilayer capacitor body that maintains capacitance, and the discrete discharge electrodes that provide ESD protection. This segmentation allows each component to be optimized independently - the capacitor can maintain small interlayer spacing for high capacitance while the discharge electrodes provide the necessary spacing and protection path for ESD durability.
Solution Approach 2:
The discharge electrodes act as an intermediary element between the external environment and the internal electrodes of the capacitor. They provide a dedicated path for ESD current to bypass the internal electrode structure, protecting the capacitor from ESD damage without requiring modifications to the internal electrode spacing that would affect capacitance.
2Reliability
If the margin between internal electrode and external surface is increased to prevent short-circuit, then reliability is improved, but capacitance is reduced
Solution Approach 1:
The invention separates the functions of capacitance storage and short-circuit protection by introducing discrete discharge electrodes. The internal electrodes can be positioned close to the external surface to maximize capacitance, while the discharge electrodes provide the necessary margin and protection path independently.
Solution Approach 2:
The discharge electrodes serve as an intermediary protective layer between potential external faults and the internal electrode structure. They provide a safe discharge path that prevents short-circuits without requiring increased spacing between the internal electrodes and external surface, thereby maintaining capacitance.
3Reliability
If interlayer spacing or external electrode margin is increased to improve reliability, then ESD and short-circuit resistance are improved, but capacitance is reduced
Solution Approach 1:
The invention segments the capacitor structure into the capacitor body for energy storage and discrete discharge electrodes for protection, allowing independent optimization of capacitance and reliability parameters without compromise.
Solution Approach 2:
The discharge electrodes provide multiple functions simultaneously: they protect against ESD, prevent short-circuits, and maintain mechanical stability, all while allowing the capacitor body to maintain optimal interlayer spacing for maximum capacitance.
4Ease of operation
If the multilayer capacitor is mounted on a board, then it is functional, but bending cracks may occur due to board bending
Solution Approach 1:
The discharge electrodes are positioned and configured beforehand to provide mechanical support and stress distribution. When the board bends, these electrodes and their connection structure absorb and distribute the mechanical stress, preventing crack propagation in the ceramic capacitor body.
Solution Approach 2:
The invention creates a composite structure combining the ceramic capacitor body with metal discharge electrodes and connection elements. This composite construction provides both the electrical functionality of the capacitor and the mechanical flexibility needed to withstand board bending without cracking.
5Ease of operation
If the multilayer capacitor is mounted on a board, then it is functional, but acoustic noise is generated due to piezoelectric vibrations
Solution Approach 1:
The discharge electrodes and their connection structure serve as an intermediary damping element between the piezoelectric ceramic body and the PCB board. They absorb and dissipate the mechanical vibrations generated by the piezoelectric effect, converting them into heat and preventing acoustic noise emission.
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 solution effectively enhances ESD durability, prevents overcurrent and bending cracks, and minimizes capacitance reduction, while reducing acoustic noise by using a high-rigidity chip to bypass ESD without altering the internal electrode design or increasing interlayer spacing or external electrode margins.
Implementation Method 1
an ESD functional member disposed in the space portion and connecting the first and second discharge portions
Implementation Method 2
acoustic noise may be generated due to vibrations based on a piezoelectric phenomenon
Implementation Method 3
acoustic noise may be generated due to vibrations based on a piezoelectric phenomenon in terms of the characteristics of a dielectric
Data Source
AI summary
A composite electronic component includes a multilayer capacitor including a capacitor body, which includes first and second internal electrodes facing each other and a plurality of dielectric layers each interposed therebetween and first and second external electrodes disposed on opposing ends of the capacitor body, a high-rigidity chip including a substrate disposed on a lower side of the multilayer capacitor and first and second discharge electrodes disposed on the substrate and spaced apart from each other, the first and second discharge electrodes being connected to the first and second external electrodes, respectively, and extending to an upper or lower surface of the substrate, and an sealing part covering the first and second discharge electrodes and including a space portion, which is provided between the first and second discharge portions.