Common Mode Choke Coil with Concentric Planar Coils
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Solution Overview
Problem
Existing common mode choke coils suffer from reduced noise removal capability due to asymmetry and insufficient coupling between coils, leading to increased loss of normal mode signals in high-frequency bands.
Innovation Solution
A common mode choke coil design featuring concentrically wound coil patterns on multiple layers, with specific connections to maintain symmetry and enhance coupling, preventing position displacement and ensuring consistent coupling with the ground, resulting in high inductance and impedance in the common mode while keeping normal mode impedance low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the primary coil and secondary coil are arranged to overlap with each other in the stacking direction, then the device achieves a compact structure, but the symmetry property is lost leading to reduced common mode noise removal capability
Solution Approach 1:
The patent transitions from a three-dimensional overlapping stacking arrangement to a two-dimensional planar concentric arrangement. The primary and secondary coils are wound concentrically on the same plane rather than stacking vertically, which maintains symmetry while achieving compactness through planar integration rather than vertical stacking.
2Strength
If magnetic substance is used as the multilayer body, then the structural integrity is improved, but the loss of normal mode signal in high-frequency band becomes large
Solution Approach 1:
The patent extracts and removes the magnetic substance from the multilayer body structure. By eliminating the magnetic material that causes high-frequency losses, the design achieves low normal mode signal loss while maintaining structural integrity through the conductor arrangement and grounding configuration rather than magnetic material properties.
3Device complexity
If the coupling amount between each coil and ground is insufficient, then the device complexity is reduced, but the loss of normal mode signal increases
Solution Approach 1:
The patent implements equipotential grounding by connecting both the primary and secondary coils to the ground through via holes that provide low-impedance paths. This creates equal potential references for both coils, ensuring sufficient coupling to ground without complex additional structures, thereby preventing normal mode signal loss.
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 effectively suppresses common mode noise in high-frequency bands with minimal loss of normal mode signals, maintaining signal integrity and noise removal efficiency across a wide frequency range.
Implementation Method 1
the first coil pattern and the third coil pattern are concentrically wound, as parallel or substantially paralleled lines, in loop shapes on one surface, and the second coil pattern and the fourth coil pattern are concentrically wound, as parallel or substantially parallel lines, in loop shapes on the one surface with being adjacent to the first coil pattern and the third coil pattern
Data Source
AI summary
A common mode choke coil includes a primary coil and a secondary coil, wherein the primary coil includes a first coil pattern and a second coil pattern connected in series to the first coil pattern, and the secondary coil includes a third coil pattern and a fourth coil pattern connected in series to the third coil pattern. The first and third coil patterns are concentrically wound, as parallel or substantially parallel lines, in loop shapes on one surface, and the second and fourth coil patterns are concentrically wound, as parallel or substantially parallel lines, in loop shapes on the one surface with being adjacent to the first and third coil patterns.