Programmable RRH Power Supply for Long Cable Voltage Drop
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Solution Overview
Problem
The challenge in cellular base stations is to reduce power loss and cost associated with delivering DC power to remote radio heads located at the top of tall towers, where significant voltage drops occur due to long power cables, leading to inefficient power supply and potential service disruptions during outages.
Innovation Solution
A programmable power supply system that senses current drawn by remote radio heads and adjusts voltage output to maintain a constant voltage level near the maximum specified voltage, using measured resistance of power cables to minimize power loss and enhance battery backup duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If long power cables are used to deliver DC power to remote radio heads at the top of tall towers, then the radio heads can be powered, but significant voltage drops occur leading to power loss
Solution Approach 1:
The power supply system dynamically adjusts the voltage output based on real-time cable resistance measurements and load conditions. The system transitions from a static voltage supply to a dynamic one that adapts to changing conditions, optimizing power delivery and minimizing losses in the long cables.
Solution Approach 2:
The system changes the voltage parameter dynamically to compensate for cable resistance. By measuring the actual voltage at the remote radio head and adjusting the supply voltage accordingly, the system maintains optimal power delivery despite the long cable length and varying load conditions.
2Loss of energy
If higher voltage is used to reduce current and power loss, then power efficiency improves, but the risk of overvoltage damage increases
Solution Approach 1:
The system implements feedback control by continuously monitoring the voltage at the remote radio head and adjusting the power supply output accordingly. This closed-loop control ensures that the voltage remains within safe limits while compensating for cable drops, preventing both power loss and overvoltage damage.
Solution Approach 2:
The power supply transitions from a static voltage source to a dynamic one that adapts in real-time to load conditions and cable characteristics, maintaining optimal voltage levels without exceeding safety thresholds.
3Loss of energy
If larger, thicker power cables are used to reduce resistance and voltage drop, then power delivery efficiency improves, but cable cost and installation complexity increase
Solution Approach 1:
Instead of changing the physical parameter of the cable (thickness/gauge), the system changes the electrical parameter (voltage) to compensate for the fixed cable resistance. This allows the use of standard cable specifications while achieving low voltage drops through intelligent voltage management.
Solution Approach 2:
The system replaces the mechanical solution (thicker cables) with an electrical/electronic solution (voltage adjustment). By using programmable power supplies to dynamically adjust voltage, the system achieves the same effect as thicker cables without the associated cost and installation complexity.
4Loss of energy
If conventional fixed voltage power supplies are used, then the system is simple to operate, but power loss increases and battery backup duration is reduced
Solution Approach 1:
The power supply system performs self-adjustment by automatically measuring cable resistance and load conditions, then autonomously optimizing its voltage output. This eliminates the need for manual configuration while minimizing power loss, and the system maintains itself without user intervention.
Solution Approach 2:
The system uses feedback from voltage and current measurements to automatically adjust its operation, transitioning from a fixed, manual system to a self-optimizing system that reduces power loss without requiring user expertise.
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 approach reduces power loss along power cables, decreases the need for larger, more expensive cables, and extends battery backup time during outages, leading to cost savings and improved reliability.
Implementation Method 1
A programmable power supply system that senses current drawn by remote radio heads and adjusts voltage output to maintain a constant voltage level near the maximum specified voltage, using measured resistance of power cables to minimize power loss
Data Source
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AI summary
A method is provided. The method comprises determining configuration data; wherein the configuration data comprises a resistance of a bypass circuit coupled between a remote radio head and a power cable; using the configuration data, determining the resistance of the power cable coupling a programmable power supply to the remote radio head mounted on a mounting structure, comprising: entering a calibration mode; setting an output voltage of the programmable power supply; measuring an output current of the programmable power supply; storing the output current; and determining the cable resistance; and storing the resistance of the power cable.