Integrated Power Cable With Tower-Mounted DC-DC Conversion
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Solution Overview
Problem
The use of remote radio heads in cellular base stations results in significant power loss due to long power cables, which reduces the operating time of battery backup systems and increases costs, while operating at higher DC voltages poses safety risks and heat management challenges.
Innovation Solution
An integrated power cable system with a DC-DC voltage converter mounted on the tower, which raises the voltage to reduce current and minimize power dissipation, combined with overvoltage protection and heat dissipation mechanisms, such as heatsinks, to enhance safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the voltage provided to the power cable is increased to reduce current and minimize power dissipation, then power loss in the power cable is reduced, but safety risks for humans and equipment increase
Solution Approach 1:
A DC-to-DC converter is introduced as an intermediary device mounted on the tower. It receives high voltage input from the power cable and converts it to a lower, safer voltage for the remote radio head. This mediator allows the system to transmit power efficiently at high voltage while ensuring safe operating voltage at the destination, thus resolving the contradiction between reduced power loss and safety risks.
2Loss of energy
If the voltage provided to the power cable is increased to reduce current and minimize power dissipation, then power loss in the power cable is reduced, but heat generation from DC-to-DC converters increases
Solution Approach 1:
The DC-to-DC converter is extracted from the ground-based equipment and relocated to be mounted directly on the tower near the remote radio head. This extraction places the heat-generating component in a location with better airflow and散热 conditions, allowing the system to benefit from high-voltage power transmission while managing heat dissipation more effectively at the source.
3Ease of operation
If the length of the power cable is increased to supply power to the remote radio head on the tower, then the remote radio head can be mounted proximate to the antennas, but power loss due to the power cable increases
Solution Approach 1:
The system changes the voltage parameter of the power transmission. By transmitting power at elevated voltage levels through the long power cable and then converting to lower voltage at the remote radio head, the system enables the remote radio head to be mounted near the antennas while minimizing power loss during transmission through the extended cable length.
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 solution reduces power loss in the power cable, extends battery backup operation time, lowers capital and operating expenses, and ensures safer and more efficient energy distribution by minimizing heat generation and risk.
Implementation Method 1
at least one DC-DC voltage converter having at least one input and at least one output; wherein the second end is fixedly electrically and mechanically connected to the input
Implementation Method 2
combined with overvoltage protection and heat dissipation mechanisms, such as heatsinks, to enhance safety and efficiency
Data Source
AI summary
In one embodiment, an integrated power cable is provided. The integrated power cable, comprises a power cable having a first end and a second end; wherein the first end is configured to be electrically coupled to a DC power supply; at least one DC-DC voltage converter having at least one input and at least one output; wherein the second end is fixedly electrically and mechanically connected to the input; a first connector fixedly connected mechanically and electrically to the output; and wherein the first connector is configured to be coupled to at least one remote radio head.