Interleaved Sub-Turn Coil Layout for High Coupling in Thin Arrays
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Solution Overview
Problem
The miniaturization and thinning of coil components in electronic devices pose challenges in maintaining existing characteristics, particularly in securing a sufficient coupling coefficient in inductor array-type coil components with low inductance, due to limitations in increasing the magnetic material ratio and frequency characteristics.
Innovation Solution
A coil component design featuring two coils with winding portions less than one turn each, sharing a core and disposed on opposite surfaces of a support member, with external electrodes connected to each coil, optimizing the coupling coefficient by ensuring magnetic coupling without additional turns beyond the winding portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic material ratio in the core is increased to maintain coil characteristics during miniaturization, then the inductance characteristics are improved, but the device size and complexity increase
Solution Approach 1:
The patent divides the coil structure into multiple winding portions (first winding portion and second winding portion) with each having less than one turn. This segmentation allows the coils to achieve sufficient coupling coefficient without requiring increased magnetic material ratio, thus maintaining coil characteristics while avoiding increased device size
Solution Approach 2:
The patent changes the winding parameter by designing winding portions with less than one turn (e.g., 3/4 turn) instead of traditional multi-turn windings. This parameter change enables the coils to generate adequate magnetic coupling in a compact space, resolving the contradiction between maintaining reliability and reducing volume
2Area of stationary object
If the coil component is miniaturized and thinned to meet electronic device requirements, then the mounting area is reduced, but the coupling coefficient between coils deteriorates
Solution Approach 1:
The patent positions the first winding portion and second winding portion in an interleaved manner where portions of each winding are disposed on the internal side of the other winding. This nesting arrangement maximizes magnetic coupling between the coils within the minimized mounting area, preventing deterioration of the coupling coefficient despite miniaturization
3Reliability
If additional turns are added to the coils to improve inductance, then the magnetic coupling is enhanced, but the inductance becomes too high for array-type applications
Solution Approach 1:
The patent applies partial action by using winding portions with less than one turn (e.g., 3/4 turn) instead of complete turns. This partial winding provides sufficient magnetic coupling for array-type coil applications while keeping the inductance value low, avoiding the need for additional turns that would excessive the inductance
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 secures a high coupling coefficient, achieving improved magnetic coupling and reduced inductance, suitable for miniaturized electronic devices, with a coupling coefficient of about 0.4 or more, enhancing the performance of inductor array-type coil components.
Implementation Method 1
a first coil disposed in the body and including a first winding portion having a turns number less than one turn, a second coil disposed in the body and including a second winding portion having a turns number less than one turn
Data Source
AI summary
A coil component includes a body, a first coil disposed in the body and including a first winding portion having a turns number less than one turn, a second coil disposed in the body and including a second winding portion having a turns number less than one turn, a first external electrode and a second external electrode, respectively connected to one end and the other end of the first coil, and a third external electrode and a fourth external electrode, respectively connected to one end and the other end of the second coil. A portion of the first winding portion is disposed on an internal side of the second winding portion, and a portion of the second winding portion is disposed on an internal side of the first winding portion.