PoE PSE Control Circuitry for Rapid Restart After Power Interruption
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Solution Overview
Problem
Power over Ethernet (PoE) systems take a long time to restart after a power outage, which is undesirable for lighting systems, as a 24-port PoE hub can take up to 15 seconds to start up all ports, including detection and classification stages.
Innovation Solution
A PoE system with a Power Sourcing Equipment (PSE) that includes control circuitry, memory, and timing functionality to identify the class of a Powered Device (PD) before a power interruption, store this information, and supply power accordingly, allowing for immediate or delayed classification and detection post-interruption based on the interruption length, thereby reducing restart time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PoE system performs detection and classification stages after power interruption, then power is supplied safely to valid PDs, but restart time becomes extremely long (up to 15 seconds)
Solution Approach 1:
The PSE control circuitry performs detection and classification of the PD before the power interruption occurs, stores the identified PD class in memory, and restores power using the pre-stored classification information when power is restored after a short interruption, thereby eliminating the need to repeat detection and classification stages
Solution Approach 2:
The system dynamically adjusts its behavior based on the power interruption duration: for short interruptions (below threshold), it uses pre-stored classification information to skip detection and classification stages; for long interruptions (above threshold), it performs full detection and classification to ensure safety, thus adapting the restart process to the specific conditions
2Loss of time
If PoE system skips detection and classification stages for short power outages, then restart time is reduced, but power may be supplied to invalid devices
Solution Approach 1:
The PSE control circuitry performs detection and classification of the PD before the power interruption occurs, stores the identified PD class in memory, and restores power using the pre-stored classification information when power is restored after a short interruption, thereby eliminating the need to repeat detection and classification stages
Solution Approach 2:
The system dynamically adjusts its behavior based on the power interruption duration: for short interruptions (below threshold), it uses pre-stored classification information to skip detection and classification stages; for long interruptions (above threshold), it performs full detection and classification to ensure safety, thus adapting the restart process to the specific conditions
Data Source
AI summary
A PoE system PSE, constituted of: a power source input; a classification functionality arranged to determine the class of a PD; a memory arranged to store thereon the determined class; a timing functionality arranged to output the length of a power interruption to the power source input; and a control circuitry; wherein, responsive to an indication of the timing functionality that the power interruption length is greater than a predetermined time value, the control circuitry is arranged to initiate the class determination of the classification functionality, and wherein, responsive to an indication of the timing functionality that the power interruption length is not greater than the predetermined time value, the control circuitry is arranged to: supply power from the power source input to the PD responsive to the stored determined class; and not initiate the class determination of the classification functionality prior to the power supplying.