ESD Protection Device Cavity Discharge Path
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Solution Overview
Problem
Conventional ESD protection devices exhibit low resistance to continuous electro-static discharge (ESD) due to concentrated energy and thermal shock on the discharge auxiliary electrode, leading to decreased dielectric strength.
Innovation Solution
The ESD protection device includes a base body with a cavity around the discharge auxiliary electrode, exposing the first and second discharge electrodes, allowing both internal and creepage discharge, which disperses energy and enhances heat release, thereby increasing dielectric strength during continuous ESD application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge auxiliary electrode is provided to electrically couple the first and second discharge electrodes, then ESD protection performance is improved, but dielectric strength decreases due to concentrated thermal shock during continuous ESD application
Solution Approach 1:
The invention introduces a cavity structure that segments the discharge path into multiple regions (internal discharge region and creepage discharge region). This segmentation allows the discharge to occur in different locations and modes, preventing concentration of thermal shock on the discharge auxiliary electrode while maintaining ESD protection functionality.
Solution Approach 2:
The invention adds a spatial dimension by creating a cavity around the discharge auxiliary electrode. This cavity provides a three-dimensional space that accommodates both internal discharge and creepage discharge paths, dispersing the energy concentration issue from a one-dimensional problem to a multi-dimensional solution.
2Reliability
If energy is concentrated in the discharge auxiliary electrode for ESD discharge, then ESD protection performance is improved, but heat release capability deteriorates leading to reduced dielectric strength
Solution Approach 1:
The cavity acts as an intermediary space between the discharge electrodes and the surrounding environment. It facilitates heat transfer from the discharge auxiliary electrode to the external environment, improving heat release capability while maintaining the ESD protection function.
Solution Approach 2:
The invention creates different local environments within the cavity structure. The cavity provides a specific local space that allows for improved heat dissipation in the region around the discharge auxiliary electrode, while maintaining the electrical coupling function where needed.
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 design increases dielectric strength and ESD responsiveness without compromising ESD protection performance by facilitating creepage discharge and improved heat dispersion, effectively addressing the limitations of conventional devices.
Implementation Method 1
electro-static discharge (ESD)
Implementation Method 2
heat of the discharge auxiliary electrode is able to be released to the cavity
Data Source
AI summary
An ESD protection device includes a base body, first and second discharge electrodes provided in the base body and facing each other in a lamination direction, and a discharge auxiliary electrode that is provided between the first and second discharge electrodes and electrically couples the first and second discharge electrodes. The base body includes a cavity provided around at least a portion of an outer surface of the discharge auxiliary electrode and the cavity exposes the first discharge electrode, the second discharge electrode, and a region that is included in the outer surface of the discharge auxiliary electrode and is present between the first discharge electrode and the second discharge electrode.