PoE Switch Standby Power Reduction via Keep-Alive Signaling
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Solution Overview
Problem
Existing Power over Ethernet (PoE) lighting systems consume standby power when luminaires are not in use, as they are typically configured to remain always on, lacking a method to efficiently switch off power without specialized controllers or commissioning.
Innovation Solution
A network switch and luminaire configuration that passively listens for communication activity to determine power supply, using a predetermined shut-off period to switch off power when activity ceases, with a firmware-updatable PoE switch and luminaire that send 'keep alive' signals to maintain power, reducing standby consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PoE switches supply power to luminaires continuously, then the luminaires remain always on and ready for operation, but standby power is consumed when luminaires are not in use
Solution Approach 1:
The PoE switch monitors communication activity from luminaires and uses this feedback to control power supply. When no communication signals are detected within a predetermined period, the switch automatically cuts off power to that luminaire, thereby eliminating standby power consumption while maintaining readiness through automatic re-powering upon detection of communication activity.
2Loss of energy
If PoE switches are configured to switch off power to inactive luminaires, then standby power consumption is minimized, but specialized lighting network controllers or individual commissioning of PoE switches is required
Solution Approach 1:
The PoE switch performs self-service by automatically monitoring communication activity on its ports and autonomously deciding when to supply or cut off power to connected luminaires. This eliminates the need for specialized external controllers or complex commissioning procedures, as the switch uses its built-in capability to detect communication signals and control power accordingly.
3Loss of energy
If PoE switches monitor communication activity to control power supply, then power is efficiently managed, but the switch requires configuration or firmware updates
Solution Approach 1:
The PoE switch implements a simplified version of power management by monitoring only communication activity presence rather than implementing full-featured lighting control protocols. This partial action approach achieves significant power efficiency benefits while avoiding the need for complex configuration or extensive firmware modifications, as it uses the switch's inherent communication monitoring capability.
Data Source
Figure 1
Figure 2~4
Figure 3~5
AI summary
A network switch (5) for example a PoE switch, is operable to control supply of electrical power to individual luminaires (1,2) in a lighting network. The luminaires receive both electrical power for operation and signals to switch on and off through a common cable connection (9) such as an Ethernet connection. When switched on, each luminaire sends a signal repeatedly towards the Po E switch until switched off and the switch (5) supplies power to the luminaire whilst successive signals are received within a period less than a predetermined shut off period (Delta). In this way, power to the luminaire can be disconnected to avoid comsumption of standby power when not in use.