Coil Component With Segmented Magnetic Regions For Low Coupling

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Solution Overview

Problem

The challenge is to design a coil component with a low coupling coefficient to prevent voltage rise phenomena in micro-current regions, while minimizing the mounting area and maintaining high efficiency, which is difficult due to limitations in chip size and the need to decrease the coupling coefficient between coils.

Innovation Solution

The coil component includes first and second magnetic regions with higher magnetic permeability than the surrounding magnetic body, enclosing the coils to reduce mutual inductance and increase leakage inductance, thereby decreasing the coupling coefficient without increasing the mounting area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the interval between two coils is increased to decrease the coupling coefficient, then the voltage rise phenomenon is prevented, but the mounting area increases

Engineering Contradiction:

Improvevoltage stabilityVSAvoidmounting area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The magnetic body is divided into first and second magnetic regions with different magnetic permeabilities. The first magnetic region (with higher permeability) is positioned near the first coil to increase its self-inductance, while the second magnetic region (with lower permeability) is positioned near the second coil to decrease its self-inductance. This segmentation allows different magnetic characteristics in different regions to achieve low coupling coefficient without increasing interval.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different magnetic permeability regions are locally positioned around different coils. The first magnetic region with higher permeability is locally placed near the first coil, and the second magnetic region with lower permeability is locally placed near the second coil. This local differentiation of magnetic properties enables precise control of inductance values and coupling coefficient without requiring increased spacing.

Inventive Principle:

Principle #3Local quality

2Reliability

If the coupling coefficient between coils is decreased to prevent voltage rise phenomenon, then the voltage stability is improved, but it becomes difficult to maintain high efficiency and compactness

Engineering Contradiction:

Improvevoltage stabilityVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The magnetic permeability parameter of the magnetic body is changed in different regions. By creating first and second magnetic regions with different permeability values within the same magnetic body structure, the patent achieves different inductance characteristics for each coil while maintaining a unified overall structure, thus reducing device complexity.

Inventive Principle:

Principle #35Parameter changes

3Area of stationary object

If the chip size is reduced to minimize mounting area, then the compactness is improved, but the ability to decrease coupling coefficient is limited

Engineering Contradiction:

Improvechip sizeVSAvoidcoupling coefficient control

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

Within the limited chip size, the patent applies local quality by creating regions with different magnetic permeabilities at specific locations. This allows the magnetic field distribution to be locally optimized to reduce coupling between coils without requiring increased overall chip dimensions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The magnetic body with differentiated permeability regions acts as an intermediary that mediates the magnetic interaction between coils. By controlling the magnetic flux distribution through the first and second magnetic regions, it enables coupling coefficient reduction within compact dimensions.

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 design effectively decreases the coupling coefficient, preventing voltage rise phenomena in micro-current regions and increasing self-inductance, while maintaining efficiency and compactness.

Implementation Method 1

first and second magnetic regions embedding and enclosing first and second coils therein, respectively; a magnetic body embedding and enclosing the first and second magnetic regions therein

Methodology Applied

Scientific EffectMagnetic permeability: Magnetic Field

Implementation Method 2

first coil disposed inside the first magnetic region and having a self-inductance; second coil disposed inside the second magnetic region and having a self-inductance

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9984807B2Coil component and board having the same

Publication Date: 2018.05.29 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A coil component includes: a first coil and a second coil; a first magnetic region embedding the first coil therein and a second magnetic region embedding the second coil therein; a magnetic body embedding the first and second magnetic regions therein; first and second external electrodes disposed on external surfaces of the magnetic body and connected to a first end portion and a second end portion of the first coil, respectively; and third and fourth external electrodes disposed on the external surfaces of the magnetic body and connected to a first end portion and a second end portion of the second coil, respectively.