Power Supply Voltage Drop Compensation for Remote Radio Heads
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Solution Overview
Problem
Existing power supplies struggle to predictably deliver voltage to remote radio heads due to changes in cable resistance caused by environmental conditions, leading to potential equipment damage or degradation of RF signal communications.
Innovation Solution
A programmable power supply system that dynamically compensates for voltage drops by measuring and adjusting output voltage based on real-time cable resistance and current draw, using a control logic that recalculates cable resistance when deviations exceed a tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply uses a fixed cable resistance value for voltage drop compensation, then the system is simple to implement, but the voltage delivery becomes unpredictable when environmental conditions change cable resistance
Solution Approach 1:
The system continuously measures the actual voltage at the remote end and compares it with the expected voltage based on the current resistance value. When a deviation exceeds a threshold, the system updates the cable resistance value to match actual conditions. This closed-loop feedback mechanism ensures reliable voltage delivery despite environmental changes.
Solution Approach 2:
The power supply system automatically monitors its own performance by measuring remote end voltage and self-corrects by updating the cable resistance value when deviations occur. This self-service approach eliminates the need for external manual calibration or intervention, maintaining reliability while managing complexity internally.
2Reliability
If the power supply dynamically updates cable resistance values, then voltage delivery remains reliable under changing conditions, but the system complexity increases
Solution Approach 1:
The system employs continuous feedback by monitoring remote end voltage and comparing it against expected values. When deviations exceed a predetermined threshold, the system automatically updates the cable resistance parameter. This feedback-driven approach maintains voltage delivery consistency while managing complexity through conditional updates rather than continuous complex calculations.
Solution Approach 2:
The system dynamically adjusts the cable resistance parameter based on actual operating conditions. By changing this key parameter in response to measured voltage deviations, the power supply maintains accurate voltage drop compensation despite environmental variations, achieving reliability through adaptive parameter management.
3Stability of the object's composition
If the power supply monitors and adjusts output voltage in real-time, then the load delivered voltage remains stable, but the control system becomes more complex
Solution Approach 1:
The power supply uses a feedback control mechanism where a sensor continuously measures the voltage at the remote end and feeds this information back to the control logic. The control logic compares the measured voltage with the target voltage and adjusts the output accordingly, maintaining stable delivery despite cable resistance variations.
Solution Approach 2:
The power supply system autonomously monitors its own output and self-regulates to maintain stable voltage delivery. The control logic automatically adjusts the output voltage based on real-time measurements, eliminating the need for external intervention and ensuring consistent performance.
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
Maintains consistent voltage delivery to remote radio heads, mitigating power loss and preventing equipment damage while ensuring stable RF signal quality.
Implementation Method 1
a voltage drop, Vdrop, can therefore be expected to occur along the length of the coaxial cable
Implementation Method 2
the power supply will monitor the current draw, IRRH, from the RRH, and is programed with a measurement of the resistance of the cable, RCable, so that it can determine an expected voltage drop using ohms law based on the relationship VDrop=IRRH*RCable
Data Source
AI summary
In one embodiment, a power supply comprises: a conversion circuit that outputs an output voltage at a first end of a cable; a remote voltage sensor measures a load delivered voltage from a second end of the cable; a control logic, wherein the power conversion circuit regulates the output voltage based on a signal from the control logic; a current sensor that measures current flow through the cable; and a resistance measurement circuit that computes a resistance of the cable as a function of the load delivered voltage, the current flow and the output voltage. The control logic regulates the load delivered voltage based on a voltage drop calculated utilizing the resistance. The control logic detects a change in the resistance of the cable based on the load delivered voltage and dynamically updates a value of the resistance for calculating the voltage drop when the change exceeds a tolerance.