Power Conductor Load Detection for Safe Remote Power Disconnection
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Solution Overview
Problem
Existing power distribution systems in distributed antenna systems face challenges in safely delivering power to remote units due to regulatory limitations on direct current delivery, which can lead to safety concerns and increased installation complexity and cost.
Innovation Solution
A power distribution system that includes a current measurement circuit and a controller circuit to measure and manage current flow, disconnecting the power source if excessive current is detected, ensuring safety by preventing unintended power delivery to external loads, and reconnecting when safe conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher voltage is used to deliver power over the communications link, then the current can be reduced to meet safety regulations, but the risk of electrocution increases and additional safety measures are required
Solution Approach 1:
The system performs preliminary actions by periodically disconnecting the remote unit from the power conductors to perform load detection tests before normal operation continues. This advance detection prevents harmful effects by identifying external loads that could cause electrocution risks before they become dangerous conditions.
Solution Approach 2:
The patent introduces an intermediary measurement circuit that acts as a mediator between the power source and the remote unit. This circuit measures current flow during disconnection periods to detect external loads, providing safety monitoring without requiring additional physical barriers or protective equipment.
2Reliability
If multiple conductors are used to split current delivery, then the current per conductor can be reduced to meet safety limits, but the device complexity and installation cost increase
Solution Approach 1:
The system uses self-service by leveraging the existing power conductors and the remote unit's own power consumption characteristics to perform load detection. The measurement circuit utilizes the natural current flow variations when the remote unit is disconnected, eliminating the need for separate test conductors or additional measurement equipment.
Solution Approach 2:
The power conductors serve multiple functions: they deliver power to the remote unit during normal operation and simultaneously serve as the measurement path for detecting external loads during disconnection periods. This multi-functionality eliminates the need for dedicated safety monitoring infrastructure.
3Duration of action of stationary object
If the remote unit remains continuously connected to receive power, then uninterrupted power supply is maintained, but the ability to detect external loads is reduced
Solution Approach 1:
The system implements periodic disconnection of the remote unit from the power conductors at predetermined intervals. This periodic action creates temporary measurement opportunities to detect external loads while maintaining overall power supply continuity. The disconnection periods are optimized to be brief enough not to significantly impact power delivery but long enough to perform accurate current measurements.
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
The system effectively manages power distribution to remote units, ensuring safety by preventing unintended power delivery to external loads and reducing installation complexity and costs by avoiding the need for additional safety measures.
Implementation Method 1
a current measurement circuit configured to measure current flow from the power source
Data Source
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AI summary
Safety power disconnection for remote power distribution in power distribution systems is disclosed. The power distribution system includes one or more power distribution circuits each configured to remotely distribute power from a power source over current carrying power conductors to remote units to provide power for remote unit operations. A remote unit is configured to decouple power from the power conductors thereby disconnecting the load of the remote unit from the power distribution system. A current measurement circuit in the power distribution system measures current flowing on the power conductors and provides a current measurement to the controller circuit. The controller circuit is configured to disconnect the power source from the power conductors for safety reasons in response to detecting a current from the power source in excess of a threshold current level indicating a load.