ESD Protection Device With Tilted Electrodes and Auxiliary Discharge Units

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Solution Overview

Problem

ESD protection devices face reliability issues due to increased distance between inner electrodes or conductive particles following discharge, leading to improper discharge functionality.

Innovation Solution

The ESD protection device incorporates a configuration with main and secondary discharge units, where input and output electrodes are tilted and auxiliary discharge electrodes are used to reduce discharge start voltage, and secondary discharge units are strategically placed to maintain effective discharge even if main discharge units experience temperature-related issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If discharge occurs in main discharge units, then ESD protection is provided, but the temperature increases causing inner electrodes to melt or cracks to occur, increasing the distance between electrodes and reducing reliability

Engineering Contradiction:

Improvedischarge functionalityVSAvoidtemperature of discharge unit

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The ESD protection device is divided into multiple independent discharge units, each with its own inner electrodes and auxiliary discharge electrodes. This segmentation ensures that if one discharge unit experiences temperature increase and electrode damage, other discharge units remain functional and can still provide ESD protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Auxiliary discharge electrodes are provided in advance alongside the inner electrodes. These auxiliary electrodes serve as backup discharge paths that can be activated if the main inner electrodes fail due to temperature-related damage, cushioning against the loss of discharge functionality.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If the distance between inner electrodes increases due to melting or cracking, then the discharge start voltage increases, but discharge may not occur properly between inner electrodes

Engineering Contradiction:

Improvedischarge functionalityVSAvoiddistance between inner electrodes

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

Auxiliary discharge electrodes act as intermediaries between the input and output electrodes. When the main inner electrodes fail due to increased distance, the auxiliary discharge electrodes provide an alternative discharge path, mediating the discharge function and ensuring continued ESD protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The device utilizes changes in discharge start voltage as a parameter indicator. When inner electrodes deteriorate and distance increases, the discharge start voltage naturally increases. The system accommodates this parameter change by switching to auxiliary discharge electrodes that maintain appropriate discharge characteristics.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If auxiliary discharge electrodes are added to form secondary discharge units, then discharge start voltage is reduced and reliability is improved, but device complexity increases

Engineering Contradiction:

Improvedischarge functionalityVSAvoidnumber of electrodes

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The auxiliary discharge electrodes serve multiple functions: they act as backup discharge paths when inner electrodes fail, provide alternative discharge routes to maintain low discharge start voltage, and can operate independently or in conjunction with inner electrodes. This multi-functionality justifies the additional components by providing enhanced reliability without requiring completely separate backup systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 configuration enhances the reliability of ESD protection devices by ensuring proper discharge functionality even when main discharge units' start voltage becomes excessively high due to temperature-related issues, such as melting or cracking, by engaging secondary discharge units.

Implementation Method 1

electro-static discharge (ESD) protection devices for suppressing the breakdown of electronic devices caused by ESD

Methodology Applied

Scientific EffectElectrostatic Discharge: Electrostatic Discharge

Implementation Method 2

if discharge occurs, the temperature of a discharge unit increases

Methodology Applied

Scientific EffectJoule Heating: Joule Heating

Data Source

PatentUS9413168B2ESD protection device

Publication Date: 2016.08.09 MURATA MFG CO LTD

AI summary

An ESD protection device 1 includes a plurality of input electrodes 21a through 21d and a plurality of output electrodes 21e through 21h. The plurality of input electrodes 21a through 21d are disposed along a first direction. The plurality of output electrodes 21e through 21h are disposed along the first direction. The plurality of output electrodes 21e through 21h oppose the input electrodes 21a through 21d in a second direction which is tilted with respect to the first direction. End portions of the input electrodes 21a through 21d on a side closer to the output electrodes 21e through 21h in the second direction and end portions of the output electrodes 21e through 21h on a side closer to the input electrodes 21a through 21d in the second direction form main discharge units 31a through 31d.