Semiconductor Coil Layout to Reduce Substrate Eddy Current Loss

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Solution Overview

Problem

Electronic components with semiconductor substrates experience increased loss due to eddy currents when a coil's magnetic flux passes through, particularly with low-resistance portions formed by impurity doping, leading to inefficiencies.

Innovation Solution

An electronic component design featuring a semiconductor substrate with a low-resistance portion and a coil where the coil's axial direction is parallel to the substrate's main surface, reducing magnetic flux through the substrate, along with an insulating layer configuration and external terminals for improved mounting and reduced resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the coil's axial direction is perpendicular to the substrate main surface, then the magnetic flux efficiently passes through the substrate, but eddy current losses increase significantly in low-resistance portions

Engineering Contradiction:

Improveeddy current lossVSAvoidcoil configuration

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent inverts the conventional coil orientation by setting the axial direction parallel to the substrate main surface instead of perpendicular. This inversion reduces the magnetic flux component passing through the substrate, thereby minimizing eddy current generation in low-resistance portions while maintaining the coil's inductive function

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the orientation parameter of the coil from perpendicular to parallel relative to the substrate surface. This parameter change fundamentally alters the magnetic flux distribution, reducing the flux component that would otherwise pass through the substrate and generate harmful eddy currents

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a low-resistance portion is formed by impurity doping, then the electrical resistance is reduced for better conductivity, but eddy current losses increase when magnetic flux passes through

Engineering Contradiction:

Improveelectrical conductivityVSAvoideddy current loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent maintains the low-resistance portion formed by impurity doping for good conductivity, but converts the potential harm (eddy current loss) into a benefit by reorienting the coil. The low-resistance portion now serves the useful function of conducting current with minimal resistance while the coil orientation ensures that magnetic flux does not pass through it, eliminating the harmful eddy current effect

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Loss of energy

If the coil axial direction is parallel to the main surface, then eddy current losses are reduced, but the magnetic flux through the substrate is also reduced

Engineering Contradiction:

Improveeddy current lossVSAvoidmagnetic flux

Core Design Contradiction:

Loss of energyVSPower

Solution Approach 1:

The patent segments the magnetic flux into two functional components: one component passes through the substrate to provide the necessary magnetic field for the device's operation, while the other component is directed away from the low-resistance portion to prevent eddy current generation. This segmentation allows both functions to coexist without interference

Inventive Principle:

Principle #1Segmentation

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 minimizes eddy current losses and allows for efficient operation by reducing the magnetic flux through the substrate, enhancing the Q value of the coil and enabling smaller, more efficient electronic components.

Implementation Method 1

the magnetic flux generated by the coil passes through the substrate

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

eddy currents generated in the substrate by the magnetic flux passing through the substrate become larger

Methodology Applied

Scientific EffectEddy currents: Eddy Currents

Data Source

PatentUS20230395309A1Electronic component and method of manufacturing electronic component

Publication Date: 2023.12.07 MURATA MFG CO LTD

AI summary

An electronic component includes a semiconductor substrate having a main surface and containing a semiconductor material, and a coil provided on the main surface and composed of a conductive material. The semiconductor substrate includes a low-resistance portion having a lower electrical resistance than a semiconductor composed of the semiconductor material. The coil is electrically connected to the low-resistance portion. An axial direction of the coil is parallel to the main surface.