Common Mode Filter Wire Crossing for High-Frequency Tuning
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Solution Overview
Problem
Existing common mode filters with toroidal cores face challenges in finely adjusting high-frequency characteristics due to the inversion of wire positional relationships when wires cross, making precise adjustments difficult.
Innovation Solution
A common mode filter design featuring a winding core with first and second wires wound in the same direction, where a predetermined turn of each wire crosses multiple times, allowing for fine adjustment of high-frequency characteristics by varying the number and position of crossings, and incorporating a non-layer part to enhance symmetry and capacitance, thereby improving reflection and noise conversion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of wires are made to cross each other once to enhance symmetry, then high-frequency characteristics are improved, but the positional relationship between wires is inverted making fine adjustment difficult
Solution Approach 1:
The wire crossing structure is divided into multiple discrete crossing points along the winding path. Instead of a single crossing that inverts position, the wires cross multiple times (e.g., 2-4 crossings per differential pair), with each crossing segment contributing to symmetry enhancement while the cumulative effect maintains the original positional relationship, enabling fine adjustment of high-frequency characteristics.
Solution Approach 2:
The wire crossing is implemented as a periodic structure where the wires cross at regular intervals along their winding path around the drum core. This periodic crossing pattern creates multiple symmetry points that reinforce each other, improving high-frequency characteristics while the repetitive nature allows for controlled adjustment of the crossing frequency and position.
2Reliability
If wires cross each other to improve symmetry, then high-frequency characteristics are enhanced, but the structural complexity increases
Solution Approach 1:
The crossing points are integrated into the continuous winding path of the wires around the drum core, rather than being separate discrete components. The wires maintain their winding trajectory while incorporating crossing segments, merging the symmetry-enhancing crossing function with the existing winding structure, thus improving symmetry without proportionally increasing overall structural complexity.
Solution Approach 2:
The wire crossings are arranged in the axial direction along the drum core, adding a dimensional aspect to the symmetry enhancement. Instead of planar crossings, the crossings occur at different axial positions, utilizing the third dimension (axial length) to achieve symmetry improvement while maintaining a relatively simple radial and angular wire arrangement.
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 enables precise tuning of high-frequency characteristics and enhances symmetry and noise conversion, leading to improved reflection and noise suppression capabilities across a range of frequencies.
Implementation Method 1
a pair of wires are made to cross each other on the way to thereby enhance symmetry between differential signals in a high-frequency region
Implementation Method 2
a capacitance component generated between the first and second wires changes
Data Source
AI summary
Disclosed herein is a common mode filter that includes a winding core part and first and second wires wound in a same direction around the winding core part. A predetermined one turn of the first wire crosses a predetermined one turn of the second wire a plurality of times.