Coil Component Aligned Winding Reduces Stray Capacitance
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Solution Overview
Problem
The existing winding form of common mode choke coils results in asymmetrical stray capacitance due to the alignment of turns, leading to mode conversion between common mode noise and differential mode signals, affecting the electrical characteristics of the coil.
Innovation Solution
A coil component design featuring a drum-shaped core with aligned turns of the first and second wires in a perpendicular direction, utilizing an auxiliary line to maintain a stable winding state and reduce stray capacitance, thereby minimizing asymmetry in stray capacitance occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the second wire is wound such that its turns are right above the turns of the first wire having the same ordinal number, then the winding structure is simple and compact, but tensile force during winding causes the turns of the second wire to fit into recessed portions between adjacent turns of the first wire, resulting in asymmetrical stray capacitance and mode conversion
Solution Approach 1:
The patent intentionally introduces asymmetry by adding an auxiliary line that is fitted into recessed portions between adjacent turns of the first wire. This auxiliary line creates a symmetrical constraint system that counteracts the asymmetrical deformation caused by tensile force during winding, thereby maintaining uniform stray capacitance distribution and preventing mode conversion between common mode noise and differential mode signals
2Ease of manufacture
If the turns of the second wire are aligned with the turns of the first wire having the same ordinal number, then the winding process is straightforward, but the n-th turn of one wire contacts the n-th turn and (n-1)-th or (n+1)-th turn of the other wire, creating large asymmetrical stray capacitance
Solution Approach 1:
The auxiliary line serves as an intermediary element that is fitted into recessed portions between adjacent turns of the first wire. This intermediary structure provides a mechanical constraint that prevents the turns from deforming under tensile force, thereby maintaining symmetrical alignment and reducing asymmetrical stray capacitance between the first and second wires
3Volume of moving object
If the second wire is wound outside the first wire with turns of the same ordinal number aligned, then the structure is compact, but the distance between turns decreases to minimum due to tensile force, causing turns to fit in recessed portions and creating asymmetry
Solution Approach 1:
The auxiliary line is pre-positioned into the recessed portions between adjacent turns of the first wire before the second wire is wound. This preliminary action creates a stable framework that maintains the positional relationship between turns, preventing deformation under tensile force and ensuring symmetrical stray capacitance distribution throughout the wound structure
Data Source
AI summary
A coil component includes a first alignment winding region in which a second wire is continuously wound so as to have turns such that the turns of the second wire are aligned with turns of a first wire having the same ordinal number outside the first wire in a direction perpendicular to a central axis. The ordinal number is counted from the turn nearest to the first flange portion.