Surge Protection Element With Intermediate Electrode

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Solution Overview

Problem

Conventional overvoltage protection elements fail to effectively manage follow currents and arc voltages, leading to potential damage in electronic components and electrical networks due to insufficient arcing voltage and extinguishing behavior.

Innovation Solution

An overvoltage protection element with a concentric and rotationally symmetrical geometry, featuring a first electrode, a second electrode, and an intermediate electrode structure arranged in a gas discharge space, which increases electrical resistance and arc voltage by dividing the gas discharge space into gas-permeable partial spaces, thereby enhancing follow current extinguishing behavior.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional overvoltage protection elements are used, then the structure is simple, but the arc voltage is insufficient and follow current extinguishing behavior is poor

Engineering Contradiction:

Improvefollow current extinguishing behaviorVSAvoidelectrode structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gas discharge space is divided into multiple gas-permeable partial spaces by the intermediate electrode structure, creating multiple discharge paths. This segmentation increases the total arc voltage while maintaining a relatively simple overall structure, as the intermediate electrode structure can be implemented as simple rings or dividers within the existing electrode configuration.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the electrical resistance between electrodes is increased to increase arc voltage, then the follow current extinguishing behavior improves, but the device complexity increases

Engineering Contradiction:

Improvearc voltageVSAvoidelectrode structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

An intermediate electrode structure is introduced between the first and second electrodes to act as a mediator that increases electrical resistance and arc voltage. This intermediate structure serves as a middle element that creates additional discharge paths without requiring complete redesign of the main electrode configuration, thus improving reliability while controlling complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the gas discharge space is divided into partial spaces, then the arc voltage increases, but the manufacturing complexity increases

Engineering Contradiction:

Improvearc voltageVSAvoidgas discharge space configuration

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The intermediate electrode structure can be implemented as thin ring-shaped electrodes or flexible dividers that partition the gas discharge space into partial spaces. These thin-film or ring-shaped intermediates are easier to manufacture and assemble than rigid complex structures, as they can be simply positioned within the existing electrode housing without requiring complex gas-tight sealing.

Inventive Principle:

Principle #30Flexible shells and thin films

4Reliability

If concentric electrode geometry is used to increase electrical resistance, then the arc voltage increases, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvearc voltageVSAvoidconcentricity of electrodes

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

While the overall geometry may be concentric, the intermediate electrode structure introduces asymmetric elements such as radially extending arms or non-uniform spacing in specific regions. This controlled asymmetry allows optimization of the electric field distribution and arc voltage characteristics while providing tolerance to manufacturing variations in perfect concentricity.

Inventive Principle:

Principle #4Asymmetry

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 increases the arc voltage and improves the follow current extinguishing behavior, protecting electronic components from overvoltages by maintaining a high arcing voltage even after the initial overvoltage has decayed, thus preventing damage to connected electrical networks.

Implementation Method 1

The gas discharge space is provided for discharging a gas, for example a noble gas, to reduce an overvoltage

Methodology Applied

Scientific EffectGas discharge: Electric Arc

Implementation Method 2

the electrical resistance between the first electrode and the second electrode is increased by the coaxial or concentric geometry of the first and second electrodes and the provision of the intermediate electrode structure

Methodology Applied

Scientific EffectElectrical resistance: Electrical Resistance

Data Source

PatentEP3111521B1Surge protection element

Publication Date: 2019.08.28 TDK ELECTRONICS AG

Figure 1~2

AI summary

Disclosed is a surge protection element (100) comprising a first electrode (1), a second electrode (2), and a gas discharge chamber (10). The gas discharge chamber (10) is located between the first electrode (1) and the second electrode (2). The surge protection element (100) also comprises an intermediate electrode structure (3) that is located in the gas discharge chamber (10) and is electrically insulated from the first and second electrodes (1, 2).