PoE Powered Device Feedback for Accurate Cascaded Power Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Power over Ethernet (PoE) systems, the power consumption values determined by the protocol often differ from the actual consumption, leading to inefficient utilization of power and inaccurate power provisioning.
Innovation Solution
The system includes a powered device with a power meter and controller that measures input voltage and current values to calculate the actual allowable power based on the output voltage and maximum allowable power values, allowing for accurate power consumption determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of powered devices increases or power demand increases, then the power consumption of the cable becomes more significant, but the power consumption value determined by the protocol becomes less accurate
Solution Approach 1:
The patent implements a feedback mechanism where the powered device measures actual power consumption through the power meter and communicates this information back to the power sourcing equipment. The power sourcing equipment uses this feedback to adjust power allocation, creating a closed-loop system that maintains accuracy despite increasing numbers of devices or power demand.
Solution Approach 2:
The patent replaces the traditional protocol-based power determination method with a direct measurement approach using a power meter. This substitution of the measurement mechanism allows for accurate real-time power consumption detection without relying on protocol calculations that become inaccurate with higher power demands or device counts.
2Device complexity
If the power consumption value determined by the protocol is used, then the power distribution can be simplified, but the power provided by the system is not fully utilized
Solution Approach 1:
The powered device performs self-measurement of its actual power consumption through the integrated power meter. This self-service capability allows the device to accurately report its true power requirements, enabling the power sourcing equipment to optimize power allocation and eliminate waste, thereby improving overall power utilization efficiency without significantly increasing system complexity.
3Measurement precision
If a power meter is added to measure actual power consumption, then accurate power consumption calculation is achieved, but the device complexity increases
Solution Approach 1:
The power meter is designed to serve multiple functions: it measures actual power consumption, provides data for power allocation decisions, and enables optimization of power distribution. By making the measurement component multi-functional, the patent reduces the need for separate systems and minimizes the overall increase in device complexity while achieving accurate power consumption measurement.
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
Enables precise power management by calculating the actual allowable power, optimizing cable length and number of cascaded devices based on power loss, and ensuring efficient power distribution.
Implementation Method 1
The power meter measures an input voltage value and an input current value of the powered device
Data Source
AI summary
A powered device (PD) for Power over Ethernet (PoE), a PoE system, and an operating method for PoE are provided. The powered device includes a first Ethernet transmission port, a second Ethernet transmission port, a power meter, and a controller. The first Ethernet transmission port receives a first power and a first packet from a power sourcing equipment (PSE). The first packet includes a first output voltage value and a first maximum allowable power value. The second Ethernet transmission port provides a second power to a next-level powered device. The power meter measures an input voltage value and an input current value of the powered device. The controller sends a second packet to the next-level powered device via the second Ethernet transmission port. The second packet includes a second output voltage value and a second maximum allowable power value.