Remote Radio Power Supply With Dynamic DC Voltage Boost
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Solution Overview
Problem
The transmission of DC power to remote radio heads at the top of tall antenna towers results in significant power loss due to long coaxial cables, degrading signal-to-noise ratio and increasing costs, especially with the proliferation of smaller cellular base stations requiring shorter cabling connections.
Innovation Solution
A programmable power supply system that adjusts the DC voltage output based on measured current and electrical path characteristics, selectively providing a boost voltage when conditions allow to minimize power loss and prevent overvoltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC power is transmitted over long coaxial cables to remote radio heads at the top of tall antenna towers, then the radio can be positioned at the optimal location for signal transmission, but significant power loss occurs due to the long cable length
Solution Approach 1:
The patent dynamically adjusts the DC voltage level transmitted over the power cable based on the measured current draw of the remote radio head. By increasing voltage when current is high and decreasing voltage when current is low, the system optimizes power delivery efficiency and reduces energy loss in the cable while maintaining reliable operation.
Solution Approach 2:
The system continuously monitors the current draw of the remote radio head and uses this feedback to adjust the transmitted voltage in real-time. This closed-loop control ensures that power is delivered efficiently under varying load conditions, minimizing energy loss while maintaining signal transmission quality.
2Loss of energy
If the DC voltage is increased to reduce current and power loss, then power transmission efficiency improves, but overvoltage conditions may damage the radio equipment
Solution Approach 1:
The system uses real-time current monitoring to dynamically adjust voltage levels, ensuring that voltage is increased only when necessary to maintain efficient power delivery. This feedback mechanism prevents overvoltage conditions by continuously adapting to the actual load requirements of the radio equipment.
Solution Approach 2:
The patent implements dynamic voltage adjustment rather than a fixed high voltage approach. The voltage level changes continuously based on operating conditions, allowing the system to achieve high efficiency when needed while automatically reducing voltage to safe levels when the radio's current draw decreases, thus preventing equipment damage.
3Ease of operation
If the radio is located at the bottom of the tower for easy maintenance access, then device accessibility improves, but signal transmission quality degrades due to longer cable runs
Solution Approach 1:
By dynamically changing the voltage parameter based on cable length and current draw, the system compensates for the increased power loss associated with longer cable runs. This allows the radio to be positioned at the bottom of the tower for easy maintenance while maintaining power transmission efficiency through adaptive voltage control.
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
Reduces power loss along the power cable, decreases operational costs, and minimizes the need for backup batteries, while maintaining reliable operation during power outages.
Implementation Method 1
a converter circuit electrically coupled to the input conductors and the output conductors, the converter circuit configured to change the first DC voltage level to a second DC voltage level
Data Source
AI summary
Methods and systems of powering a radio that can be mounted on a tower of a wireless communication system are provided in which a direct current (“DC”) voltage is provided to the radio over a power cable from a power supply configured to change the direct current (DC) output from the power supply based on a measured current level. The power supply is configured to change the DC voltage from a first voltage level to a second voltage level in response to the measured current being greater than or equal to a first threshold value.