PoE Power Sourcing Equipment Rapid Activation Circuit
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Solution Overview
Problem
Existing Power over Ethernet (PoE) systems face inefficiencies due to the need for a large maintain power signature (MPS) to prevent shutdown, leading to significant power wastage and delayed device activation, particularly in applications like lighting where rapid start-up is required.
Innovation Solution
A rapid start-up PoE system with a power sourcing equipment (PSE) and powered device (PD) that uses a signature resistive element, power converter, and PSE control circuitry to manage power output, allowing for immediate detection and reduced power draw, thereby minimizing waste and enabling quicker device activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PD continuously draws a predetermined minimum amount of power to maintain the MPS, then the PSE remains active and ready to supply power, but a significant amount of power is wasted (approximately 150 mW)
Solution Approach 1:
The system performs preliminary detection of the MPS signature before committing to continuous power supply. The PSE control circuitry detects the resistive signature indicating a connected PD, then transitions to a lower power maintenance mode while remaining ready to quickly restore full power if needed, avoiding the need to continuously draw the full 150 mW.
Solution Approach 2:
The power draw is made dynamic rather than static. The system adjusts power consumption based on operational state: drawing sufficient power during detection and activation phases, then reducing to minimal power during maintenance phases, while maintaining the capability to quickly increase power draw when the MPS is lost or a new PD is detected.
2Reliability
If the PSE performs periodic detection stages every 1-2 seconds to detect connected PDs, then power can be supplied when needed, but there is unacceptable delay for applications like lighting
Solution Approach 1:
The PSE control circuitry performs preliminary detection of the MPS signature continuously or at much higher frequency than the standard 1-2 second periodic detection. This preliminary detection allows the system to identify connected PDs and activate power supply immediately, eliminating the unacceptable delays for lighting applications while maintaining detection accuracy.
3Loss of energy
If the PSE shuts down within a predetermined time period when no MPS is detected, then power is conserved, but control electronics and network cards cannot receive power unless the MPS is maintained
Solution Approach 1:
The system performs preliminary detection of the MPS signature and maintains power supply for control electronics based on this detection, rather than requiring continuous MPS maintenance. The PSE control circuitry detects the signature indicating control electronics are connected, then maintains power availability for these devices without requiring the PD to continuously draw the full 150 mW, achieving both power conservation and operational convenience.
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
The system achieves almost full-time power availability for loads while maintaining compliance with PoE standards, allowing for rapid turn-on of devices without the need for excessive initial power draw, thus reducing power wastage and enhancing system responsiveness.
Implementation Method 1
determine the resistance of the first signature resistive element
Implementation Method 2
a power converter; and a load in electrical communication with a power output of the power converter
Data Source
AI summary
A PSE control circuitry arranged to: control the power source to output a detection signal; responsive to the detection signal, determine the resistance of a signature resistive element; in the event that the determined resistance is within a predetermined range, control a power source to output power to the load; in the event that the determined resistance is outside the predetermined range, prevent the power source from outputting power for a predetermined disconnect time period; detect the amount of power drawn from the power source; in the event that the detected power amount is less than a predetermined minimum power draw value, control the power source to cease output of power for a predetermined power down time period, the predetermined power down time period less than the predetermined disconnect time period; immediately subsequent to both time periods, control the power source to output the detection signal.