PoE Powered Device Interface Power Demand Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power over Ethernet (PoE) systems face disruptions due to power losses over Ethernet cabling length, leading to interruptions in power supply to Powered Devices (PDs) when their power demand exceeds the available power from Power Sourcing Equipment (PSE), especially in scenarios with no backup power source.
Innovation Solution
A Powered Device Interface with supply sensing, demand sensing, and control circuits that sense the available power and requested power demand, and reduces the power demand by adjusting functionality when it exceeds the available power, using a voltage converter to manage power distribution effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the length of Ethernet cabling increases between PSE and PD, then the coverage area and flexibility of the system improve, but power loss during transmission increases due to resistive losses
Solution Approach 1:
The patent changes the electrical parameters (voltage and current) dynamically based on cable length and power demand. The PSE adjusts output voltage and current levels to compensate for resistive losses in longer cables, ensuring adequate power delivery to the PD while managing power loss through parameter optimization.
2Productivity
If the PD operates at full load to meet high power demands, then the functionality and performance of the device improve, but the PSE may cease to supply power due to current protection being triggered
Solution Approach 1:
The patent implements a feedback mechanism where the PSE continuously monitors current draw and power delivery status. When approaching current protection thresholds, the PSE adjusts output parameters or notifies the PD to reduce power demand, preventing shutdown while maintaining optimal performance. The system feedback loop ensures reliability by anticipating protection triggers before they occur.
Solution Approach 2:
The patent makes the power delivery system dynamic by allowing real-time adjustment of power parameters based on actual conditions. The PSE can dynamically change voltage and current output levels, and the PD can dynamically adjust its power consumption, enabling the system to operate reliably at or near maximum capacity without triggering protective shutdowns.
3Adaptability or versatility
If the PD requests more power than is available from the PSE, then the device functionality improves, but power supply interruption occurs disrupting operations
Solution Approach 1:
The patent implements preliminary action by having the PSE and PD perform power negotiation and classification before full operation begins. The system determines available power capacity and required power demand in advance, allowing the PD to configure its functionality to match available power before operations start, preventing interruptions by proactively matching capabilities with constraints.
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
Prevents power supply shutdowns by reducing power demand to match available power, ensuring continuous operation of PDs by adjusting functionality such as processing speed or component usage, thereby maintaining system stability and preventing interruptions.
Implementation Method 1
a voltage converter configured to receive an output from the control circuit to reduce the power demand requested by the powered device when the power demand requested by the powered device exceeds the amount of power allowed by the power source equipment for the powered device
Data Source
AI summary
A powered device interface includes a supply sensing circuit, a demand sensing circuit, and a control circuit. The supply sensing circuit is configured to sense an amount of power received by the powered device from at least one power source equipment over an ethernet cable. The demand sensing circuit is configured to sense a power demand requested by the powered device. The control circuit is coupled with the supply sensing circuit and the demand sensing circuit and is configured to cause the power demand requested by the powered device to be reduced when the power demand requested by the powered device exceeds the amount of power allowed by the power source equipment for the powered device.