Programmable Power Supply for Remote Radio Head Voltage Stability
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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 the current and resistance of the power cable to maintain a substantially constant voltage at the remote radio head, reducing power loss by optimizing the voltage delivery to match the maximum voltage requirements of the radio head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If DC power is delivered over long coaxial 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 system dynamically adjusts the voltage output parameter of the power supply based on the measured current and known cable resistance. By changing the voltage parameter in real-time, the system compensates for voltage drops across long cables, maintaining efficient power delivery without excessive power loss.
Solution Approach 2:
The system implements a feedback mechanism where the power supply measures the current being drawn by the remote radio head and uses this information to adjust its output voltage. This closed-loop control ensures that the power supply optimizes its output to minimize power loss in the cables while meeting the load requirements.
2Loss of energy
If higher voltage is used to reduce current and power loss, then power delivery efficiency improves, but the radio head may exceed its maximum voltage rating
Solution Approach 1:
The power supply transitions from a static fixed-voltage output to a dynamic adjustable voltage system. The voltage output is continuously adapted based on real-time current measurements and cable characteristics, allowing the system to optimize for efficiency while automatically preventing overvoltage conditions that could damage the radio head.
Solution Approach 2:
The system dynamically changes the voltage parameter within safe operating limits. By adjusting the voltage based on measured current and known cable resistance, the system maximizes power delivery efficiency while ensuring the voltage at the radio head never exceeds its maximum rating, thus maintaining reliability.
3Loss of energy
If larger diameter power cables are used to reduce resistance, then power loss decreases, but cable cost and installation complexity increase
Solution Approach 1:
Instead of changing the physical parameter of cable diameter, the system changes the electrical parameter of output voltage to compensate for cable resistance. This allows the use of smaller, more cost-effective cables while achieving the same power delivery efficiency through intelligent voltage adjustment based on measured current and known cable resistance.
4Device complexity
If fixed voltage output is used from the power supply, then system simplicity is maintained, but power loss increases over long cable runs
Solution Approach 1:
The power supply incorporates a feedback mechanism that measures the current drawn by the remote load and uses this information to adjust its output voltage. This feedback-based control allows the system to maintain low power loss without requiring complex external control systems, achieving a balance between simplicity and efficiency.
Solution Approach 2:
The power supply performs self-adjustment based on its own current measurements and knowledge of the cable characteristics. The system serves itself by automatically optimizing its output voltage without requiring external intervention or complex control infrastructure, thereby maintaining simplicity while reducing power loss.
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 operational costs by maintaining a constant voltage at the remote radio head, allowing for the use of smaller diameter power cables and longer cabling connections, while ensuring reliable power delivery to the radio head.
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.