Inductance Device Inter-Wire Capacitance Suppression

Solution Overview

Problem

The inter-wire capacitance effect in inductance devices used in high-frequency noise filtering can degrade their noise filtering properties, and grounding the magnetic core reduces design flexibility.

Innovation Solution

An inductance device comprising a magnetic core, a coil made of insulated conductive wire, and a dielectric member that forms a capacitor with the conductor, which is insulated from the magnetic core, thereby suppressing inter-wire capacitance without grounding the magnetic core.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the magnetic core is grounded to suppress inter-wire capacitance effect, then noise filtering property is improved, but design flexibility is reduced

Engineering Contradiction:

Improvenoise filtering propertyVSAvoiddesign flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces a conductor as an intermediary element that is insulated from the magnetic core, and a dielectric member disposed between the conductor and the coil to form a capacitor. This capacitor structure acts as a mediator to suppress the inter-wire capacitance effect without requiring the magnetic core to be grounded, thus maintaining design flexibility while improving noise filtering property.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the magnetic core is grounded to suppress inter-wire capacitance effect, then high-frequency noise filtering is improved, but structural complexity increases

Engineering Contradiction:

Improvehigh-frequency noise filteringVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a conductor as an intermediary element that is insulated from the magnetic core, and a dielectric member disposed between the conductor and the coil to form a capacitor. This capacitor structure acts as a mediator to suppress the inter-wire capacitance effect without requiring the magnetic core to be grounded, thus maintaining design flexibility while improving noise filtering property.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a capacitor is formed between the coil and conductor with dielectric member to suppress inter-wire capacitance, then noise filtering performance is improved, but design flexibility is maintained

Engineering Contradiction:

Improvenoise filtering performanceVSAvoiddesign flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces a conductor as an intermediary element that is insulated from the magnetic core, and a dielectric member disposed between the conductor and the coil to form a capacitor. This capacitor structure acts as a mediator to suppress the inter-wire capacitance effect without requiring the magnetic core to be grounded, thus maintaining design flexibility while improving noise filtering property.

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

This configuration enhances the attenuating characteristic of the inductance device across a wide frequency range without compromising design flexibility, achieving better noise filtering performance.

Implementation Method 1

The dielectric member, the conductor and the coil constitute a capacitor

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

When an inductance device is used in high frequency region, inter-wire capacitance of the coil might have a detrimental effect on noise filtering property of the inductance device

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS7714683B2Inductance device, filter device comprising the same, and noise filter comprising the same

Publication Date: 2010.05.11 TOKIN CORP

AI summary

An inductance device comprises a magnetic core, a coil a conductor and a dielectric member. The coil is made of turns of insulated conductive wire. The conductor is distinct from the coil and is insulated from the magnetic core. The dielectric member is disposed between the conductor and the coil. The dielectric member, the conductor and the coil constitute a capacitor. The inductance device is used in, for example, a filter device or a noise filter.