Common Mode Choke With Asymmetric Winding Coupling
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Solution Overview
Problem
Conventional common mode chokes have a limited operating range bandwidth and electrical properties, such as insertion loss and reflection, which need to be improved for effective suppression of unwanted signals in circuits.
Innovation Solution
A common mode choke design with different couplings between windings, including magnetic and capacitive couplings, and varying winding lengths and core shapes, allows for enhanced electrical properties by presenting low impedance to push-pull signals and high impedance to common mode signals, thereby extending the operating range and improving mode conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional common mode chokes use uniform windings on toroidal cores, then the structure is simple and easy to manufacture, but the operating range bandwidth is limited and electrical properties are insufficient
Solution Approach 1:
The patent applies local quality by creating different coupling conditions in different spatial regions of the winding. Specifically, the first turn is positioned in a first spatial region with a first coupling to the second turn, while the n-th turn is positioned in a second spatial region with a different second coupling to the second turn. This local variation in coupling characteristics extends the operating bandwidth without requiring complete structural redesign.
Solution Approach 2:
The patent implements asymmetry by deliberately creating non-uniform coupling between different turns of the winding. The coupling between the first turn and second turn differs from the coupling between the n-th turn and second turn. This asymmetric coupling distribution broadens the frequency range over which the choke maintains effective common mode rejection.
2Reliability
If common mode chokes use uniform coupling between all windings, then the manufacturing process is simple, but insertion loss and reflection characteristics are not optimized
Solution Approach 1:
The patent optimizes electrical properties by applying local quality principles to the coupling structure. Different turns are positioned in different spatial regions creating locally optimized coupling conditions. The first turn in the first spatial region provides different coupling characteristics than the n-th turn in the second spatial region, thereby improving insertion loss and reflection characteristics across the operating bandwidth.
3Object-affected harmful factors
If common mode chokes suppress common mode signals effectively, then unwanted signals are attenuated, but mode conversion from common mode to push-pull signals needs improvement
Solution Approach 1:
The patent improves mode conversion performance by changing the coupling parameters between different turns. By positioning turns in different spatial regions with different coupling strengths, the choke can more effectively convert common mode signals to push-pull signals while maintaining suppression performance. This parameter variation optimizes the transformation efficiency between signal modes.
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 common mode choke achieves reduced insertion loss and reflection across a wider frequency range, enhancing its ability to suppress common mode signals and convert them into push-pull signals effectively.
Implementation Method 1
Common mode chokes are current-compensated chokes with two or more windings through which the operating current flows in opposite directions. This allows the magnetic fields of the corresponding windings to cancel each other out
Implementation Method 2
Common mode chokes present very high inductance to common mode interference, so they are well suited for suppressing unwanted signals
Data Source
AI summary
A common mode choke with extended frequency range and improved reflection in mode conversion is specified. In this case, the common mode choke has a coil with three turns, where a coupling between a first turn and a second turn is different from a coupling between the second turn and an n-th turn, and so on.