Power Cable Twisted Current Wires Reduce Ground Loop Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrical power cables induce unwanted voltages in their ground conductors due to imperfect geometry, particularly when bending, leading to ground loop noise and signal quality issues in interconnected electronic equipment.
Innovation Solution
The power cable design features twisted current carrying wires adjacent to a ground conductor, averaging the distance between the wires and minimizing magnetic flux induction, thereby reducing ground voltage differences and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional power cables are used with standard wire arrangement, then the cable structure is simple and easy to manufacture, but magnetically induced voltages are generated on the ground conductor causing ground loop noise
Solution Approach 1:
The cable internal structure is segmented into distinct functional groups: current-carrying conductors are separated from the ground conductor, with each group positioned in specific spatial zones. This segmentation allows the magnetic fields from current conductors to be spatially separated from the ground conductor, reducing magnetic coupling and induced voltages while maintaining a manageable structural complexity through organized grouping.
Solution Approach 2:
The patent transitions from a conventional planar or simple linear arrangement of conductors to a three-dimensional spatial configuration. Current-carrying conductors are positioned in one region while the ground conductor is placed in a different spatial zone, utilizing vertical and lateral dimensions to create distance between magnetic field sources and the ground conductor, thereby reducing induced voltages without significantly complicating the manufacturing process.
2Object-affected harmful factors
If all power cables maintained perfectly even separation between the ground conductor and each current carrying conductor, then no magnetically induced voltages would be created, but the cable would be difficult to manufacture and would not accommodate bending around corners
Solution Approach 1:
The cable structure is divided into flexible segments where individual conductors or conductor groups can be independently positioned and routed. This segmentation allows the cable to be assembled with approximate spacing that achieves sufficient magnetic isolation while permitting the cable to bend and conform to installation requirements without requiring perfectly uniform separation throughout the entire cable length.
Solution Approach 2:
The patent employs variable spacing parameters along the cable length, allowing the distance between current-carrying conductors and the ground conductor to be optimized in different zones. In regions where magnetic isolation is critical, greater spacing is provided, while in other regions the spacing can be reduced to accommodate bending radius requirements and manufacturing constraints, achieving a practical balance between reducing induced voltages and maintaining cable flexibility.
3Object-affected harmful factors
If the ground conductor is positioned close to current carrying conductors, then the cable diameter is reduced and the cable is more flexible, but magnetically induced voltages increase causing ground loop noise
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement to position the ground conductor at a distance from current-carrying conductors by exploiting vertical and lateral dimensions rather than simply increasing the cable's overall diameter. This allows for increased separation distance to reduce magnetic coupling while maintaining a compact cable cross-section and preserving flexibility for practical installation scenarios.
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 significantly reduces magnetically induced voltages on the ground conductor, minimizing ground loop noise and enhancing signal quality in interconnected electronic systems.
Implementation Method 1
the magnetic fields, created by the current carrying wires, that impinge upon the ground conductor will have nearly equal and opposite magnetic flux vectors over the length of the power cable run
Implementation Method 2
minimizing the magnetically induced voltages on the ground wire(s)
Data Source
AI summary
An improved power cable having an untwisted ground wire and at least two current carrying wires twisted about one another. The at least two current carrying wires make up a group having a central axis located at the cross sectional rotation axis of the current carrying wires and at a fixed distance from a cross sectional center of the untwisted ground wire, and wherein the current carrying wire group central axis and a ground wire central axis helically rotate around a common axis.