Spiral Common Mode Choke Coil Layout for Noise Reduction
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Solution Overview
Problem
Existing common mode choke coils face challenges in reducing normal mode noise while suppressing magnetic saturation without enlarging the magnetic core, as the combination of bifilar and sectional windings leads to extended winding lengths.
Innovation Solution
A common mode choke coil design featuring a pair of coils wound in a spiral shape on a magnetic core, with adjacent turns having both parallel and non-parallel running portions, where the coils overlap in parallel regions and separate orthogonally in non-parallel regions, effectively suppressing magnetic saturation and enhancing normal mode inductance without extending the winding portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bifilar winding and sectional winding are combined to suppress magnetic saturation and improve normal mode noise reduction, then noise reduction performance is improved, but the winding portion is extended in the length direction of the magnetic core, causing the magnetic core to be enlarged
Solution Approach 1:
The patent transitions from traditional linear winding arrangements to a three-dimensional spiral winding configuration. The coil winds around the magnetic core in a spiral pattern along the radial direction, creating overlapping regions that provide both bifilar and sectional winding effects without extending the axial length of the winding portion. This dimensional change allows the magnetic flux cancellation and leakage flux generation to occur in multiple spatial dimensions simultaneously.
Solution Approach 2:
The patent implements a nested winding structure where multiple turns of the coil are arranged in a spiral pattern with overlapping regions. The first and second coils are nested within each other in the radial direction, creating parallel running portions that cancel magnetic flux and non-parallel running portions that generate leakage flux. This nesting approach consolidates the winding space, preventing extension in the length direction while maintaining the dual-function winding structure.
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 design allows for improved performance in reducing normal mode noise while preventing magnetic saturation, achieving a smaller size without the need for extended winding lengths, thus enhancing noise reduction capabilities.
Implementation Method 1
the bifilar winding is adopted to cancel magnetic fluxes generated from the pair of coils, to thereby suppress magnetic saturation of the magnetic core
Implementation Method 2
the common mode choke coil also has a normal mode inductance caused by a leakage magnetic flux
Implementation Method 3
A common mode choke coil has a common mode inductance, and is mainly used to reduce the common mode noise
Data Source
AI summary
A common mode choke coil includes: a magnetic core; and a pair of coils wound on a winding portion of the magnetic core, wherein the pair of coils include a first pole coil and a second pole coil which are each wound on the winding portion in a spiral shape by N turns, and wherein the first pole coil and the second pole coil are arranged on the winding portion so that one or more turns of the N turns are adjacent to each other, and each include a parallel running portion and a non-parallel running portion, the first pole coil and the second pole coil overlapping each other in the parallel running portion, and separating from each other in the non-parallel running portion in at least one turn of the adjacent first pole coil and second pole coil as viewed from the length direction of the winding portion.