PoE Line Loss Detection via PSE-PD Voltage Feedback
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Solution Overview
Problem
Current Power over Ethernet (PoE) systems lack a mechanism to detect line loss between the power sourcing equipment (PSE) and the powered device (PD), leading to potential safety concerns and inefficiencies due to the inability to identify poor quality, damaged, or aging wires, especially with increasing power demands.
Innovation Solution
A line loss detection method is implemented in both the PSE and PD, where the PSE and PD exchange voltage and current information to calculate line power loss, allowing for the detection of impedance and power loss, and triggering warnings if thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PoE systems operate without line loss detection, then device complexity is reduced, but reliability deteriorates due to inability to detect poor quality or damaged wires
Solution Approach 1:
The PSE performs self-diagnosis by measuring its own output voltage and current, and comparing the calculated power with the actual power reported by the PD. This self-service approach enables line loss detection without requiring additional external detection devices, thus improving reliability while minimizing added complexity.
Solution Approach 2:
The system establishes a feedback loop where the PD reports its received power back to the PSE, and the PSE uses this feedback information to calculate line loss. This feedback mechanism enables continuous monitoring of line conditions, improving reliability through real-time detection capability.
2Measurement precision
If existing PDs implement UVLO for input terminal, then power protection is improved, but measurement precision deteriorates because line loss cannot be detected
Solution Approach 1:
The invention uses power consumption information as an intermediary measurement parameter. Instead of directly measuring line loss, the system measures the PD's power consumption and uses it to infer line loss conditions. This intermediary approach enables precise line loss measurement while avoiding the need for complex direct measurement hardware.
3Loss of information
If PSE measures output voltage and current, then power monitoring is improved, but line loss detection remains unavailable due to lack of feedback mechanism
Solution Approach 1:
The invention merges the line loss detection function with the existing power monitoring capabilities of the PSE. By combining the PSE's existing voltage and current measurements with the PD's power consumption reports, the system detects line loss without requiring separate dedicated detection hardware, thus reducing the complexity of information collection.
Data Source
AI summary
A power sourcing equipment (PSE), a powered device (PD) and a line loss detection method for Power over Ethernet (PoE) are provided. The PD receives a voltage/current information transmitted by the PSE to obtain an output voltage value and an output current value thereof, and the PSE receives an input voltage value returned by the PD, such that the PSE and the PD can both calculate a line power loss therebetween based on the input voltage value of the PD, the output voltage value and the output current value of the PSE; alternatively, the PD obtains the input voltage value through a voltage detection circuit under at least one state point of a power consumption that is known, and calculates, according to the output voltage value of the PSE and a known maximum power consumption of the PD, a maximum line power loss therebetween.