Differential Cable Noise Suppression Using Magnetic Resin
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Solution Overview
Problem
Existing cables with braided wire shielding suffer from insufficient shielding effects due to 'big tail' issues and require complex manufacturing processes, and magnetic powder-mixed resin layers may not provide adequate noise attenuation if insufficiently thick.
Innovation Solution
A cable design featuring signal cables and a power cable covered with a metal sheet and magnetic powder-mixed resin, with a ferrite core for noise suppression, eliminating the need for a braided wire and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a braided wire shield layer is used to suppress noise emission and electromagnetic wave entrance, then shielding effect is improved, but manufacturing complexity increases and ground potential connection reliability deteriorates due to 'big tail' issues
Solution Approach 1:
The patent extracts and removes the braided wire shield layer from the cable structure, replacing it with a simplified configuration consisting of only the signal cables, power cable, ground cable, and magnetic powder-mixed resin coating. This eliminates the manufacturing complexity and ground connection reliability issues associated with braided wire shields while maintaining noise suppression functionality through the magnetic resin material.
Solution Approach 2:
The patent changes the material parameter from conductive braided wire to magnetic powder-mixed resin, fundamentally altering how noise suppression is achieved. Instead of using electromagnetic shielding through conductive materials, the invention uses magnetic absorption properties of ferrite powder mixed in resin to attenuate electromagnetic interference, thereby simplifying the overall structure and manufacturing process.
2Device complexity
If magnetic powder-mixed resin layer is used for noise suppression, then manufacturing process is simplified, but noise attenuation becomes insufficient if the layer thickness is not enough
Solution Approach 1:
The patent employs composite materials by mixing magnetic powder (ferrite) with resin to create a coating material that combines the ease of application and conformability of resin with the noise absorption properties of magnetic powder. This composite approach allows the coating to be applied as a thin layer while still achieving effective noise attenuation, resolving the contradiction between simplified manufacturing and sufficient noise suppression.
3Device complexity
If ground potential is not ensured in braided wire shield, then shielding structure is simpler, but electromagnetic shielding effect becomes insufficient
Solution Approach 1:
The patent removes the braided wire shield layer that requires ground potential connection, eliminating the complexity and reliability issues associated with ensuring proper ground connection. The shielding functionality is replaced by the magnetic powder-mixed resin coating that provides noise suppression without requiring external ground connections, thereby maintaining simplicity while ensuring effective electromagnetic shielding.
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 solution provides effective shielding and noise attenuation for high-frequency signals without the 'big tail' problem, simplifying the manufacturing process and ensuring reliable differential transmission.
Implementation Method 1
the magnetic powder-mixed resin 28 intervenes between an inner peripheral surface of the coating material 27 and the signal cables 21a and 21b, power cable 22, and ground cable 23
Implementation Method 2
a ferrite core that surrounds a partial section of the above-described cable is provided
Data Source
AI summary
Provided is a cable including: at least two signal cables formed of first and second signal cables for differential transmission; a third cable for ground; a fourth cable for power supply; a metal sheet adapted to cover the first and second signal cables; a coating material adapted to house the first and second signal cables covered with the metal sheet, and the third and fourth cables; and a magnetic powder-mixed resin filled into an inner space of the coating material and prepared by mixing magnetic powder with a resin.