Programmable Base Station Power Supply for Tower Cable Loss Reduction
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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 the length and resistance of power cables, which degrades signal quality and increases operating costs.
Innovation Solution
A programmable power supply adjusts the voltage 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 level to match the maximum voltage the radio can handle, thereby minimizing power loss along the cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DC power is delivered over long cables to remote radio heads at the top of towers, then power can be supplied to remote locations, but significant power loss occurs due to cable resistance
Solution Approach 1:
The power supply system dynamically adjusts the voltage output based on real-time current measurements and cable resistance characteristics. The system transitions from a static fixed-voltage supply to a dynamic variable-voltage supply that adapts to changing load conditions, thereby optimizing power delivery and minimizing losses in the cable transmission.
Solution Approach 2:
The invention changes the voltage parameter of the power supply output based on the operating conditions. By adjusting the voltage level according to the current draw and cable resistance, the system maintains optimal power delivery efficiency. The power supply modifies its output parameters (voltage and current) to compensate for cable losses and maintain the radio head at its optimal operating voltage.
2Loss of energy
If higher voltage is used to reduce current and power loss in cables, then power loss decreases, but the radio may receive excessive voltage that exceeds its maximum handling capability
Solution Approach 1:
The system implements a feedback control mechanism where the power supply continuously monitors the voltage and current at its output and adjusts its operation accordingly. The power supply measures the actual voltage delivered to the radio head and uses this feedback information to regulate its output, ensuring the voltage remains within safe operating limits while minimizing power loss. This closed-loop control prevents both under-voltage and over-voltage conditions.
Solution Approach 2:
The power supply dynamically adapts its voltage output based on real-time operating conditions. Rather than using a fixed high voltage that might exceed safety limits, the system continuously adjusts the voltage level to match the actual needs of the radio head and the characteristics of the cable, thereby maintaining both efficiency and safety.
3Device complexity
If fixed voltage power supply is used, then system complexity is reduced, but power loss varies significantly with changing current draw
Solution Approach 1:
The invention transforms a static fixed-voltage power supply into a dynamic variable-voltage power supply. The system incorporates control circuitry that continuously monitors operating conditions and adjusts the voltage output accordingly. This dynamic adjustment capability allows the system to optimize power delivery efficiency across varying load conditions without significantly increasing overall system complexity.
Solution Approach 2:
The power supply changes its output voltage parameter based on the operating conditions and cable characteristics. By adjusting the voltage level to match the actual power requirements and cable losses, the system minimizes energy waste while maintaining reliable power delivery to the remote radio head.
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 and operating costs by maintaining a constant voltage at the remote radio head, allowing for the use of smaller diameter cables and longer connections, while ensuring reliable power delivery and improved signal quality.
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.