Multi-Layered Component Ferrite Varistor ESD LC Filter

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Solution Overview

Problem

Existing multi-layered components fail to offer a broad spectrum of LC filter designs and integrate electrostatic discharge (ESD) protection with high inductance and capacitance values effectively.

Innovation Solution

A multi-layered component comprising a ferrite ceramic inductive region with coil structures and a varistor ceramic capacitive region, utilizing conical plated-through holes for conductor track connections, and a metal-containing interlayer to prevent dopant diffusion, allowing for symmetrical construction and integration of ESD protection and filter functions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional multi-layered components are used, then the structure is simple, but the spectrum of LC filter designs is limited and ESD protection with high inductance and capacitance values cannot be integrated effectively

Engineering Contradiction:

Improvespectrum of LC filter designsVSAvoidcomponent structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The component is divided into distinct functional regions: varistor regions for ESD protection and capacitance, ferrite regions for inductance, and conductor track regions. This segmentation allows independent optimization of each function while maintaining overall integration, enabling a broad spectrum of LC filter designs with high inductance and capacitance values

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The multi-layered component integrates multiple functions into a single device: ESD protection through varistor regions, capacitance through varistor and capacitor regions, inductance through ferrite regions with conductor tracks, and filtering through the combined LC structure. This multi-functionality allows the component to serve as both ESD protection and LC filter simultaneously

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If conductor tracks are made wide for better connectivity, then connection reliability improves, but space for additional tracks is reduced

Engineering Contradiction:

Improveconnection reliabilityVSAvoidconductor track configurations

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Conductor tracks are arranged in multiple planes and layers rather than being confined to a single plane. Wide conductor tracks in one layer can be connected to narrow tracks in another layer through plated-through holes, allowing both high connection reliability and flexible track configurations to coexist by utilizing the third dimension (vertical layering)

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If different ceramic materials are used for varistor and ferrite regions, then functional performance improves, but dopant diffusion between regions occurs

Engineering Contradiction:

Improvefunctional performanceVSAvoiddopant diffusion

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

A metal-containing interlayer is positioned between the varistor ceramic regions and ferrite ceramic regions. This interlayer acts as a diffusion barrier that prevents dopant atoms from migrating between the different ceramic materials during sintering, while allowing the component to maintain its high functional performance through the use of different ceramic compositions optimized for their respective functions

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables the realization of a broad spectrum of LC filter designs with high inductance and capacitance values, along with ESD protection, and allows for flexible conductor track configurations, enhancing the component's design and production efficiency.

Implementation Method 1

The inductive region (1) comprises a ferrite ceramic (1.1) having electrode structures (1.2)

Methodology Applied

Scientific EffectFerromagnetism: Ferromagnetism

Implementation Method 2

the varistor ceramic has an ESD (electrostatic discharge) protection function

Methodology Applied

Scientific EffectElectrostatic discharge protection: Electrostatic Discharge

Implementation Method 3

The electrode structures comprise conductor tracks and plated-through holes

Methodology Applied

Scientific EffectElectroplating: Electroplating

Data Source

PatentUS8717120B2Multi-layered component

Publication Date: 2014.05.06 TDK ELECTRONICS AG

AI summary

A multi-layered component is disclosed, including at least one inductive region, wherein the inductive region includes a ferrite ceramic. The inductive region has electrode structures that form at least one inductance. The multi-layered component has at least one capacitive region, wherein at least one capacitive region includes a varistor ceramic. The capacitive region forms at least one capacitance. At least one inductive region and at least one capacitive region form at least one LC filter.