Coil Component with Permeability Gradient for Noncoupled Inductor Arrays
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Solution Overview
Problem
There is a demand for noncoupled inductor array chips with coils having the same inductance value that are not affected by magnetic flux, but existing designs struggle to achieve this, leading to inefficiencies and increased mounting area requirements.
Innovation Solution
A coil component with first and second coil portions on one surface and third and fourth coil portions on the other surface of a substrate, connected by external electrodes, where the peripheral portion has higher permeability than the core portions, allowing for symmetrical structures and reduced mutual inductance, thereby achieving equal inductance values and minimizing mounting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If noncoupled inductor array chip is used to reduce mounting area, then mounting area is reduced, but inductance values of respective coils become different
Solution Approach 1:
The magnetic body is designed with different permeability values in different regions: the first and second core portions have a first permeability value, while the third and fourth core portions have a second permeability value. This local differentiation compensates for the non-coupled structure, enabling all four coils to achieve the same inductance value while maintaining the compact array configuration.
2Object-generated harmful factors
If coils are disposed spaced apart to be noncoupled, then mutual inductance is reduced, but inductance values become different
Solution Approach 1:
The invention changes the permeability parameter of the magnetic body in different regions. By setting the first and second core portions with one permeability value and the third and fourth core portions with another permeability value, the design compensates for the reduced magnetic coupling, ensuring uniform inductance across all coils while maintaining the non-coupled spaced-apart configuration.
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 enables a noncoupled inductor array with equal inductance values across coils, reducing the mounting area and increasing efficiency by minimizing mutual inductance and coupling coefficients, while maintaining high permeability for effective magnetic flux management.
Implementation Method 1
A peripheral portion disposed outwardly of the first to fourth coil portions has greater permeability than that of the first and second core portions
Data Source
AI summary
There are provided a coil component and a board for mounting the same. The coil component includes a magnetic body including first and second coil portions disposed on one surface of a substrate and disposed linearly, based on a central portion of the magnetic body, and third and fourth coil portions disposed on the other surface of the substrate and disposed linearly, based on the central portion of the magnetic body; and first to fourth external electrodes disposed on an external surface of the magnetic body and connected to the first to fourth coil portions. The first coil portion and the third coil portion have a first core portion, and the second coil portion and the fourth coil portion have a second core portion. A peripheral portion disposed outwardly of the first to fourth coil portions has greater permeability than that of the first and second core portions.