Common-Mode Choke Coil Intertwined Wire Winding
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Solution Overview
Problem
Conventional common-mode choke coils are ineffective in removing common-mode noise due to the unequal lengths of the wires, which cause differential-mode signals to be outputted as common-mode noise.
Innovation Solution
The common-mode choke coil design features intertwined and equally wound first and second wires around a core, ensuring magnetic coupling and equal winding radii, thereby preventing common-mode noise from passing through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second wire is wound over the first wire, then the common-mode choke coil structure is formed, but the unequal wire lengths cause differential-mode signals to be converted to common-mode noise
Solution Approach 1:
The patent applies equipotentiality by ensuring both wires have equal lengths and are wound together around the core, maintaining equal potentials at corresponding positions. This prevents potential differences that would otherwise convert differential-mode signals into common-mode noise, directly resolving the harmful effect while preserving the wound structure.
Solution Approach 2:
The patent uses asymmetry by having the wires intertwined rather than one wound over the other, creating a symmetric configuration in terms of position and length. This asymmetric approach to the winding arrangement ensures both wires experience identical magnetic fields and maintain equal lengths, preventing common-mode noise generation.
2Reliability
If wires are wound around a core, then magnetic coupling is achieved, but unequal wire lengths cause potential differences that generate common-mode noise
Solution Approach 1:
The patent ensures equipotentiality by making both wires equal in length and wound together around the core, so that at any position along the wires, the potentials are equal. This eliminates the potential differences that cause differential-mode signals to convert to common-mode noise, directly improving reliability in common-mode noise removal.
Solution Approach 2:
The patent merges the winding processes of both wires by winding them together around the core simultaneously, ensuring they maintain equal lengths and identical magnetic coupling. This combined approach ensures both wires experience the same magnetic field conditions, preventing signal conversion to common-mode noise.
3Device complexity
If the second wire is longer than the first wire, then the winding structure is simplified, but potential inequality causes differential-mode signals to output as common-mode noise
Solution Approach 1:
The patent applies equipotentiality by ensuring both wires have equal lengths and are positioned symmetrically around the core. This maintains equal potentials at corresponding points, preventing the conversion of differential-mode signals to common-mode noise, while the wires are wound together to achieve this configuration.
Solution Approach 2:
Instead of having one wire wound over the other (which creates length inequality), the patent inverts the approach by having both wires wound together around the core. This reversed winding methodology ensures equal lengths and symmetric positioning, eliminating the harmful effect of potential differences.
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 effectively removes common-mode noise by maintaining equal potentials at both ends of the wires, reducing the conversion of differential-mode signals to common-mode noise, as demonstrated by lower Scd12 and Sdd11 values in experimental samples.
Implementation Method 1
first and second wires configured to be intertwined and to be wound together around the core
Data Source
AI summary
A common-mode choke coil having; a core that extends in a predetermined direction; and first and second wires that are intertwined and wound together around the core.