Winding Coil Stray Capacitance Reduction via Prism Core Positioning
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Solution Overview
Problem
Existing winding coil components face challenges in optimizing the Q factor and resonant frequency due to stray capacitance between wire layers, which is influenced by the position of the superposition beginning portion in the circumferential direction of the winding core.
Innovation Solution
A winding coil component design featuring a drum-shaped core with a superposition beginning portion located above specific side surfaces or within defined angular ranges, reducing stray capacitance and enhancing the Q factor by stabilizing the wire winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the wire is wound in multiple layers around the winding core portion, then the inductance and impedance can be increased, but stray capacitance between wire layers occurs which degrades the Q factor
Solution Approach 1:
The patent applies local quality by positioning the superposition beginning portion of the wire at a specific location (above the n-th side surface) where the stray capacitance is minimized. This localized positioning optimizes the electrical characteristics at the critical superposition point without changing the overall multi-layer winding structure, thereby maintaining high inductance while reducing parasitic capacitance that degrades Q factor.
2Reliability
If the superposition beginning portion is positioned at different circumferential locations, then the stray capacitance changes affecting Q factor and resonant frequency, but the winding structure becomes more complex to control
Solution Approach 1:
The patent applies preliminary action by pre-defining the superposition beginning portion position relative to the n-sided prism geometry (above the n-th side surface) before the winding process. This predetermined positioning approach simplifies the winding control by providing a clear geometric reference point, eliminating the need for complex real-time position adjustment while ensuring optimal stray capacitance characteristics and high Q factor.
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 improved design effectively decreases stray capacitance, leading to a higher Q factor and better reactance, as demonstrated by frequency characteristics and inductance comparisons across different samples.
Implementation Method 1
a wire is wound around the winding core portion and forms at least one multilayer portion wound around the winding core portion in layers
Implementation Method 2
the stray capacitance of the entire winding coil component changes depending on the position of the superposition beginning portion in the circumferential direction of the winding core portion
Data Source
AI summary
A winding coil component includes a drum-shaped core including a winding core having a substantially n-sided prism shape having n side surfaces positioned around a central axis. The n side surfaces include a first side surface facing a mounting substrate and wire wound around the winding core portion and forming a multilayer portion in layers including a superposition beginning portion located in a region other than a region above an n-th side surface to which the n side surfaces are arranged in order from the first side surface in a winding direction in which a lowest layer of the multilayer portion winds toward the superposition beginning portion.