Flexible Inductor Mounting Structure for Eddy Current Mitigation
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Solution Overview
Problem
In small-sized electronic devices, metallic parts near coil-shaped conductive patterns generate eddy currents, reducing the Q value of inductors, and using magnetic materials to mitigate this issue complicates manufacturing and reduces flexibility.
Innovation Solution
A flexible inductor mounting structure where the coil-shaped conductive pattern is bent with one side closer to metallic parts, creating a weaker magnetic field on the inner side, reducing the influence of metallic parts and maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic material is used to cover the coil-shaped conductive pattern to reduce eddy current influence, then the Q value of the inductor is improved, but the manufacturing process becomes complex and the flexibility of the flexible cable is degraded
Solution Approach 1:
The patent removes the magnetic material from the structure, extracting the problematic element that caused manufacturing complexity while preserving the essential functionality of the flexible inductor through alternative positioning strategies
Solution Approach 2:
The patent changes the spatial arrangement by bending the flexible inductor so that the coil-shaped conductive pattern is positioned on the inner side of the bent portion, creating a three-dimensional configuration that naturally reduces eddy current influence without requiring additional magnetic materials
2Reliability
If a magnetic material is used to cover the coil-shaped conductive pattern to reduce eddy current influence, then the Q value of the inductor is improved, but the size of the flexible cable increases
Solution Approach 1:
The patent removes the magnetic material that would increase the volume, extracting the problematic element while maintaining the functional requirements through the bent configuration approach
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by bending the flexible inductor, positioning the coil pattern on the inner side of the bend to reduce eddy current effects without adding volumetric space
3Reliability
If a ceramic-based ferrite is used as the magnetic material to reduce eddy current influence, then the Q value of the inductor is improved, but the flexibility of the flexible cable is degraded
Solution Approach 1:
The patent removes the ceramic-based ferrite magnetic material that would degrade flexibility, extracting the problematic element while maintaining inductor performance through the bent configuration that positions the coil pattern away from metallic parts
Solution Approach 2:
The patent changes from a planar to a three-dimensional bent configuration, positioning the coil-shaped conductive pattern on the inner side of the bend to naturally reduce eddy current influence without requiring rigid magnetic materials
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
Significantly reduces the decrease in Q value of the flexible inductor due to metallic parts, while maintaining flexibility and simplifying manufacturing processes.
Implementation Method 1
a magnetic field on the inner side of a flexible inductor, which is bent, is weak relative to a magnetic field on the outer side of the bent flexible inductor, and even if a metallic part is present on the inner side of the bent flexible inductor, the flexible inductor is less likely to be influenced by the metallic part
Implementation Method 2
When a cable that includes a coil-shaped conductive pattern is mounted in such a small-sized electronic device, metallic parts (metallic objects) are forced to be positioned in the vicinity of the coil-shaped conductive pattern. As a result, an eddy current is generated in the metallic parts
Data Source
AI summary
A flexible inductor includes a first input/output terminal, a second input/output terminal, and a sheet-shaped and coil-shaped conductive pattern that includes a first end, which is connected to the first input/output terminal, and a second end, which is connected to the second input/output terminal, the first input/output terminal, the second input/output terminal, and the coil-shaped conductive pattern being provided on a flexible base member. The flexible inductor is positioned in the vicinity of a metallic part, which is disposed in a housing, or a metallic portion of the housing. The flexible inductor is bent and mounted in the housing in such a manner that one side of the coil-shaped conductive pattern that is close to the metallic part or the metallic portion is the inner side of the bent flexible inductor.