Asymmetrical Winding Common Mode Choke Coil for Mode Conversion
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Solution Overview
Problem
Common mode choke coils face challenges in reducing mode conversion due to asymmetry introduced by uneven soldering and inherent directionalities in electrical characteristics, which are difficult to mitigate with symmetric winding structures.
Innovation Solution
The common mode choke coil employs an asymmetrical winding configuration where the number of turns of the first and second wires differs between the first and second winding regions, introducing directionality to compensate for inherent asymmetry and improve mode conversion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a symmetric winding structure is used, then manufacturing consistency is improved, but mode conversion characteristics deteriorate due to inherent asymmetry in soldering and electrical characteristics
Solution Approach 1:
The patent applies asymmetry by making the number of turns of the first wire different from the number of turns of the second wire in at least one winding region. This intentional asymmetry compensates for the inherent asymmetry in soldering and electrical characteristics, thereby improving mode conversion characteristics despite the loss of winding symmetry.
2Reliability
If the number of turns of first and second wires is made different, then mode conversion characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making the number of turns different only in specific winding regions (first and/or second winding regions) while maintaining other structural similarities. This localized differentiation improves mode conversion characteristics without requiring complete asymmetry throughout the entire winding structure, thereby limiting the increase in manufacturing complexity.
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 asymmetrical configuration results in improved mode conversion characteristics compared to symmetric arrangements, with noticeable differences in S-parameter frequency characteristics, effectively reducing mode conversion.
Implementation Method 1
The first and second inductors are magnetically coupled to each other
Implementation Method 2
first and second wires that are wound around the winding core part in a substantially helical manner with substantially equal number of turns
Data Source
AI summary
A common mode choke coil includes a core having a winding core part and a first and second wire wound around the winding core part. The winding core part has a first winding region, a switching region and second winding regions in this order along the axis of the winding core part. In the first winding region, each turn of the first wire is located closer to a first end portion of the winding core part than the corresponding same-numbered turn of the second wire. In the second winding region, each turn of the first wire is located closer to a second end portion of the winding core part than the corresponding same-numbered turn of the second wire. The number of turns of the first and second wires in the first winding region differs from the number of turns of the first and second wires in the second winding region.