PSE Leakage Current Inversion for False Detection Mitigation
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Solution Overview
Problem
In Power over Ethernet (PoE) systems, when two Power Sourcing Equipment (PSE) devices are attached, and one is unpowered, the active PSE may mistakenly detect a shorted Field Effect Transistor (FET) due to leakage current, leading to false fault detection and error reporting when power is applied to the unpowered PSE.
Innovation Solution
Incorporating a false detection mitigation circuit in the PSE device that increases the leakage current to a level outside the valid range for a powered device, thereby avoiding erroneous detection by ensuring the resistive signature is outside the valid range, even in multi-port configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the PSE applies a probing input to detect a powered device, then the detection accuracy is improved, but false detection occurs when an unpowered PSE is connected due to leakage current
Solution Approach 1:
The patent inverts the normal detection logic by having the unpowered PSE actively generate a leakage current that mimics a high-resistance signature, rather than passively accepting the probing input. This inversion causes the powered PSE to correctly identify the unpowered device as non-compliant, preventing false detection while maintaining accurate detection of actual powered devices.
Solution Approach 2:
The patent changes the electrical parameter (leakage current) of the unpowered PSE to a specific range that produces a resistive signature outside the valid powered device range. By adjusting the leakage current parameter, the system distinguishes between unpowered PSE devices and actual powered devices, resolving the false detection issue while preserving detection accuracy.
2Reliability
If the leakage current is increased to prevent false detection, then the detection reliability is improved, but energy consumption increases during normal operation
Solution Approach 1:
The patent implements periodic action by enabling the leakage current generation only during the detection phase when a probing input is present, and disabling it during normal operation. This timing-based activation ensures that the leakage current is present only when needed for false detection prevention, maintaining detection reliability while minimizing energy consumption during non-detection periods.
Solution Approach 2:
The patent applies preliminary action by preparing the leakage current generation circuit in advance to respond immediately when a probing input is detected. The circuit is pre-configured to activate the leakage current generation as soon as detection mode is entered, ensuring reliable detection response without requiring continuous energy consumption, thus balancing reliability and energy efficiency.
Data Source
AI summary
A system for power distribution to network devices in a powered network is described herein. The system includes a first power sourcing equipment (PSE) device, which is configured to communicate data and selectively provide power to one or more devices. The system further includes a second PSE device coupled to the first PSE device through a network cable. The second PSE device is configured to communicate data, selectively provide power to one or more devices, and to receive a probing input through the network cable. The second PSE device includes a false detection mitigation circuit, which is configured to increase a leakage current of the second PSE device. The increased leakage current is associated with a resistive signature that is outside of a resistive range of a valid powered device.