PoE Powered Device Fast Start-Up via Voltage-Current Profile Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Power over Ethernet (PoE) systems require time-consuming detection and classification processes every time they are powered up, leading to slow start-up times for Powered Devices (PDs) after power glitches or outages, and increased load on controllers during restarts.
Innovation Solution
A Power Sourcing Equipment (PSE) with a power supply, data storage, and controller that adjusts voltage levels based on stored voltage-current profiles, allowing for immediate power-up at negotiated levels without re-classification, and detects changes in PDs before boot-up, enabling faster start-up and reduced negotiation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional detection and classification processes are performed every time PoE system is powered up, then reliability of PD identification is ensured, but start-up time of PDs increases
Solution Approach 1:
The patent stores voltage-current profiles during an initial classification phase before power outages. When the PoE system is powered up again, these pre-stored profiles are used to quickly identify PDs without repeating the full detection and classification processes, thus reducing start-up time while maintaining identification reliability through profile matching
Solution Approach 2:
The patent creates copies of voltage-current profiles during the initial classification phase and stores them in memory. These profile copies are then used during restart operations to identify PDs without needing to re-measure, significantly reducing start-up time while maintaining accurate PD identification through profile comparison
2Measurement precision
If conventional detection and classification processes are performed every time PoE system is powered up, then accurate PD classification is achieved, but controller load increases
Solution Approach 1:
The patent extracts and stores the essential classification information in the form of voltage-current profiles during the initial classification phase. During restart operations, only profile matching is performed instead of executing the complete detection and classification processes, thereby reducing controller load while maintaining classification accuracy through the use of stored reference profiles
3Speed
If voltage level is immediately adjusted based on stored profile, then start-up speed increases, but risk of incorrect detection increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual voltage-current behavior during the initial powering phase and comparing it with the stored reference profile. The controller adjusts the voltage level dynamically based on this comparison, only proceeding with fast start-up when the profiles match within acceptable thresholds, thus maintaining detection accuracy while enabling rapid start-up when conditions permit
Data Source
AI summary
The present invention relates to fast start-up of powered devices (22) connected to a power sourcing equipment (10′) in a Power over Ethernet system (100). A stored voltage-current profile of an initial powering phase of a powered device (22) is provided. A voltage level provided to the powered device (22) in a subsequent initial powering phase of the powered device (22) is adjusted as long as a value corresponding to a current voltage level of a voltage-current profile of the subsequent initial powering phase deviates less than a predetermined threshold level from its corresponding value of the stored voltage-current profile of the initial powering phase of the powered device (22) and until a predetermined voltage level is reached. This can allow detecting whether a previously connected powered device (22) was replaced by another powered device (22) and to immediately start-up an unchanged powered device (22) with previously used operation parameters.