Inductor Winding Structure for High Self-Resonant Frequency
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Solution Overview
Problem
Conventional coil devices find it difficult to shift the self-resonant frequency to high frequencies due to increased inter-line capacity, limiting their miniaturization and inductance enhancement capabilities.
Innovation Solution
The coil device incorporates a combination of double-layer bank winding and single-layer layer winding portions around the winding core, allowing for improved inductance and reduced inter-line capacity, enabling the self-resonant frequency to be shifted to higher frequencies without increasing the number of turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the wire is wound in a second layer after continuously forming a first layer, then the winding number can be increased to enhance inductance, but the inter-line capacity increases making it difficult to shift self-resonant frequency to high frequency
Solution Approach 1:
The coil is segmented into multiple layers with alternating winding directions. The first layer winds in one direction and the second layer winds in the opposite direction, which segments the current paths and reduces the inter-line capacity between adjacent turns while maintaining the total winding number for enhanced inductance.
Solution Approach 2:
The patent introduces a dimensional change by alternating the winding direction between layers. Instead of simply adding more layers in the same direction, the winding direction is reversed in alternating layers, which changes the spatial arrangement of current paths and reduces inter-line capacity while preserving the inductance-enhancing effect of increased winding number.
2Object-affected harmful factors
If the wire is wound closely and adjacently in single layer along axial direction, then the self-resonant frequency can be shifted to high frequency, but the inductance is reduced
Solution Approach 1:
The patent merges the advantages of both single-layer and multi-layer windings by combining them in an alternating pattern. Sections of single-layer winding provide high self-resonant frequency characteristics, while sections of multi-layer winding provide enhanced inductance, and their combination achieves both objectives simultaneously.
Solution Approach 2:
Different sections of the coil are assigned different winding structures based on local requirements. Some sections use single-layer winding to maintain high self-resonant frequency, while other sections use multi-layer winding to enhance inductance, creating local quality variations that optimize overall performance.
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 enhances inductance and allows for a higher self-resonant frequency, facilitating miniaturization and increased winding density in a limited space, making it suitable for applications like signal coils and power supply coils.
Implementation Method 1
a winding core with a coil portion wound by a wire
Data Source
AI summary
A coil device includes a winding core with a coil portion wound by a wire and a pair of flanges respectively formed on both sides of the winding core in an axial direction. The coil portion includes a bank winding portion with double layer constituted by the wire wound around an outer circumference of the winding core and a layer winding portion with single layer constituted by the wire wound closely and adjacently to the bank winding portion along the axial direction of the winding core.