PoE Powered Device Energy Consumption Negotiation
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Solution Overview
Problem
Current Power-over-Ethernet (PoE) systems for lighting installations face challenges in providing a cost-effective method for measuring energy consumption, as specific circuitry in luminaires adds to the overall system cost, and there is a need for flexible feedback on energy usage.
Innovation Solution
A PoE system where the powered device can negotiate with the power sourcing device to measure and provide energy consumption data via an interface, allowing the power sourcing device to measure energy consumption if it has the capability, thereby eliminating the need for costly measurement circuitry in the powered device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specific circuitry for measuring energy consumption is added to the powered device, then energy consumption measurement capability is improved, but device cost and complexity increase
Solution Approach 1:
The energy consumption measurement function is extracted from the powered device and relocated to the power sourcing device. The PSE measures the energy consumption of the PD by monitoring the power parameters through the Ethernet cable connection, eliminating the need for dedicated measurement circuitry in the PD itself.
Solution Approach 2:
The power sourcing device performs multiple functions: it not only provides power to the powered device but also measures the energy consumption of the PD. This multi-functional approach consolidates measurement capabilities in the PSE, which already has access to power monitoring infrastructure.
2Measurement precision
If specific circuitry for measuring energy consumption is added to the powered device, then energy consumption measurement capability is improved, but overall system cost increases
Solution Approach 1:
The measurement circuitry is extracted from the powered device and placed in the power sourcing device. This eliminates the need for expensive measurement circuitry in each PD, reducing the overall system cost while maintaining measurement capability through the PSE's existing power monitoring infrastructure.
3Loss of information
If the powered device provides energy consumption feedback directly, then feedback accuracy is improved, but system flexibility is reduced
Solution Approach 1:
The power sourcing device acts as an intermediary between the powered device and the feedback system. It measures the energy consumption parameters and provides the feedback information, allowing the PD to remain simple while still achieving accurate measurement through the PSE's monitoring capabilities.
Data Source
AI summary
The invention relates to a PoE system, which comprises a powered device (2) and a power sourcing device (1). The power sourcing device comprises one or more ports (12) and the powered device is connectable to a port of the power sourcing device by an electrical conductor (13) for conveying the sourced power along with data. The powered device comprises an interface for providing a measure of its energy consumption within the PoE system and, if it does not have the ability to measure its energy consumption, is adapted to negotiate with the power sourcing device whether the power sourcing device has the ability to measure the energy consumption of the powered device and to provide the measured energy consumption to the powered device for provision via the interface. This can make the PoE system more flexible and allow for a single “point of contact” for providing energy usage feedback.