Programmable DC Power Supply for Remote Radio Cable Loss
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Solution Overview
Problem
Cellular base stations face significant power loss when delivering DC power to remote radio heads located at the top of towers, due to long coaxial cables, which degrades signal quality and increases operational costs.
Innovation Solution
A programmable power supply adjusts the voltage level of the DC power signal based on current and cable resistance to maintain a substantially constant voltage at the remote radio head, reducing power loss by optimizing the voltage delivery over the power cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC power is delivered over long coaxial cables to remote radio heads at the top of towers, then the radio can be positioned remotely to improve signal quality, but significant power loss occurs in the cable
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage level of the DC power signal based on the actual current draw and cable characteristics. The power supply modifies its output parameters (voltage and current) in real-time to compensate for cable losses, ensuring optimal power delivery to the remote radio head while minimizing energy waste in the cable.
Solution Approach 2:
The system implements feedback by continuously monitoring the current level drawn by the remote radio head and using this information to adjust the voltage output. The power supply receives feedback about the actual power consumption and cable conditions, then automatically adjusts its output to maintain optimal voltage levels and minimize power loss in the transmission cable.
2Power
If higher current is used to deliver power over long cables, then sufficient power reaches the remote radio head, but power loss in the cable increases due to I²R losses
Solution Approach 1:
The patent changes the voltage parameter dynamically based on the current draw. Instead of using fixed high voltage or high current, the system adjusts the voltage level to match the actual power requirements and cable conditions, optimizing the balance between power delivery and minimizing I²R losses in the cable.
Solution Approach 2:
The power supply transitions from a static, fixed-output system to a dynamic system that continuously adjusts its voltage and current output based on real-time conditions. The system adapts its parameters to match the varying power demands of the remote radio head and the actual cable loss conditions, ensuring efficient power delivery under different operating scenarios.
3Loss of energy
If voltage level is increased to reduce current and power loss, then power loss decreases, but the voltage may exceed the maximum rating of the remote radio head
Solution Approach 1:
The system uses feedback to continuously monitor the power requirements of the remote radio head and adjusts the voltage accordingly. By receiving feedback about the actual current draw and power consumption, the power supply can increase voltage to reduce cable losses while automatically preventing voltage from exceeding the equipment's maximum rating, thus maintaining both efficiency and safety.
Solution Approach 2:
The patent applies controlled parameter changes by adjusting the voltage within a specific range based on real-time conditions. The system modifies the voltage parameter dynamically but constrains it to remain below the maximum safe operating voltage of the remote radio head, optimizing power delivery while ensuring equipment safety through controlled parameter adjustment.
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 minimizes power loss and reduces operational costs by maintaining a constant voltage at the remote radio head, allowing for the use of smaller diameter cables and longer connections, thereby improving signal quality and reducing capital expenditures.
Implementation Method 1
A voltage level of the DC power signal that is output from the power supply is adjusted so that the DC power signal at a radio end of the power cable that is remote from the power supply has a substantially constant voltage notwithstanding variation in a current level of the DC power signal
Data Source
AI summary
Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (“DC”) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.