Common Mode Filter Hexahedral Electrode Layout
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Solution Overview
Problem
Existing common mode filters face challenges in miniaturization and noise removal efficiency, particularly in high-speed digital interfaces, where they are sensitive to static electricity and prone to short-circuits and over-voltage issues.
Innovation Solution
A common mode filter design featuring a hexahedral shape with a discharge part and a coil part between magnetic materials, including external and ground electrodes, which maximizes the distance between electrodes to prevent short-circuits and enhance signal transmission efficiency, while efficiently discharging over-voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of common mode filter is reduced for miniaturization, then the filter can be integrated into compact electronic devices, but the sticking strength to the target board decreases and short-circuit risk increases
Solution Approach 1:
The patent transitions from a traditional planar electrode layout to a three-dimensional configuration where electrodes are arranged on multiple surfaces of a hexahedral body. At least one electrode contacts the first surface while other electrodes contact second, third, and fourth surfaces, effectively utilizing spatial dimensions to maintain adequate electrode spacing and sticking strength despite overall miniaturization of the filter component.
2Volume of moving object
If electrodes are positioned closer together to reduce filter size, then miniaturization is achieved, but short-circuit phenomenon increases
Solution Approach 1:
The patent distributes electrodes across multiple surfaces of a hexahedral structure rather than confining them to a single plane. This spatial distribution on three-dimensional surfaces maintains sufficient electrical isolation between electrodes while reducing the overall volume of the filter, thereby preventing short-circuits during miniaturization.
Solution Approach 2:
The patent employs an asymmetric electrode arrangement where at least one electrode contacts the first surface and other electrodes contact different surfaces (second, third, fourth surfaces) of the hexahedral body. This asymmetric configuration optimizes the distance between electrodes of different potentials, preventing short-circuits while enabling compact design.
3Ease of manufacture
If traditional electrode arrangement is used, then manufacturing is simple, but signal transmission efficiency is poor and over-voltage discharge is ineffective
Solution Approach 1:
The patent arranges electrodes on multiple surfaces of a hexahedral body rather than on a single plane, creating a three-dimensional electrode configuration. This spatial arrangement improves signal transmission efficiency by optimizing electromagnetic field distribution and enhances over-voltage discharge capability through better grounding path geometry, while remaining compatible with standard manufacturing processes.
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 design improves signal transmission efficiency, reduces short-circuit occurrences, and effectively manages static electricity-induced over-voltages, aligning with the trend of miniaturization in electronic devices.
Implementation Method 1
a coil part including coils formed by disposing conductive patterns in a spiral shape
Implementation Method 2
the discharge part discharging an over-voltage applied between discharge patterns and ground patterns
Data Source
AI summary
A common mode filter in which at least one surface of all of external electrodes and ground electrodes are exposed to a first surface, at least one side of each of two of the external electrodes and at least one side of one of the ground electrodes contact a first side of the first surface, and at least one side of each of the external electrodes and the ground electrodes of which sides do not contact the first side contact a second side of the first surface, thereby making it possible to improve sticking strength and decrease a short-circuit phenomenon occurrence rate.