Coaxial Power Cable Structure for Low-Inductance Base Station Supply
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Solution Overview
Problem
Mobile communication base stations experience voltage oscillations due to high inductance in power cables and units, leading to instability and potential system downtime when communication loads increase, especially in 5G networks with dense coverage requirements.
Innovation Solution
A power unit and cable design with a coaxial structure featuring a multiply twisted inner conductor and spirally wound outer conductor, optimized strand configuration, and insulating layers to minimize inductance and electromagnetic induction, ensuring stable power supply to remote radio units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power cables and units are used with standard conductor configurations, then manufacturing and installation are straightforward, but inductance is high causing voltage oscillation when communication load increases
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio between the sum of areas of inner conductor strands and outer conductor strands to be within 0.4:1.6 to 1:0.4, and specifically within 0.625:1.6 to 1:0.625. This parameter optimization reduces the inductance of the power cable from conventional levels to below 0.5 μH, thereby minimizing voltage oscillation when communication load increases and improving power supply stability.
Solution Approach 2:
The patent uses composite conductor structures with multiple strands of different materials and configurations. The inner conductor consists of multiple strands with total cross-sectional area optimized relative to the outer conductor, creating a composite structure that achieves low inductance while maintaining current carrying capacity. This composite approach enables the cable to withstand load changes without voltage oscillation.
2Reliability
If power cable inductance is reduced to minimize voltage oscillation, then power supply stability improves, but cable structure complexity increases
Solution Approach 1:
The patent reduces cable structure complexity by optimizing the strand area ratio parameter to a specific range (0.4:1.6 to 1:0.4) rather than using complex multi-layer shielding or exotic conductor geometries. This parameter-based approach achieves low inductance (<0.5 μH) through straightforward conductor configuration, maintaining manufacturing simplicity while improving reliability.
Solution Approach 2:
The patent applies local quality by concentrating the inductance reduction effort specifically in the conductor configuration (inner and outer strand arrangement) rather than modifying the entire cable structure. The insulating layers and outer jacket remain conventional, while only the conductor geometry is optimized, thereby achieving low inductance without proportionally increasing overall cable complexity.
3Ease of manufacture
If conventional conductor configurations are used, then manufacturing is simple, but connection workability at remote radio units is difficult
Solution Approach 1:
The patent applies segmentation by dividing the conductors into multiple separate strands rather than using solid conductors. The inner conductor is divided into multiple strands with optimized total cross-sectional area, and the outer conductor is similarly segmented. This segmentation provides flexibility for easy connection at remote radio units while maintaining manufacturing simplicity through standard stranding processes.
Solution Approach 2:
The patent changes the conductor configuration parameter from solid or conventional stranded structures to a specific multi-strand configuration with optimized area ratios. This parameter change enables the conductors to be more flexible and easier to terminate at remote radio units, improving connection workability while maintaining ease of manufacture through standard cable fabrication techniques.
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 effectively reduces voltage oscillations and enhances connection workability, providing stable communication services by minimizing inductance and maintaining power integrity even with increased communication loads.
Implementation Method 1
A power unit and power cable for mobile communication base station which have sufficiently low inductance and thus minimize voltage oscillation regardless of a change of the amount of power transmitted when communication load of a mobile communication base station increases
Data Source
AI summary
The present disclosure relates to a power unit and a power cable for a mobile communication base station, which have sufficiently low inductance and thus minimize voltage oscillation regardless of a change of the amount of power transmitted when communication load of a mobile communication base station increases, thereby providing stable communication services, and which enhance workability of connection to a remote radio unit (RRU) at a base station.