PoE Powered Device Voltage-Adaptive Power Control
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Solution Overview
Problem
Power-over-Ethernet (PoE) systems are limited by a relatively small power intake for powered devices due to voltage range limitations in existing standards, which restricts the maximum power that can be supplied and leads to inefficiencies and potential brown-out issues.
Innovation Solution
A powered device with an electrical load power providing unit that adjusts power levels based on measured voltage, using a voltage measurement unit and power-data splitter to ensure optimal power delivery, allowing for increased power intake and reducing voltage-dependent inefficiencies, with specific thresholds and power levels defined for linear and constant adaptations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power intake of powered devices is limited to a relatively small power level to compensate for cable losses, then the voltage range limitations are respected, but the maximum power that can be supplied is restricted
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring the received voltage and adapting the power level accordingly. The control unit adjusts the power consumption of the powered device in real-time based on the measured voltage, allowing the system to operate reliably across a wider voltage range while maximizing power utilization.
Solution Approach 2:
The patent changes the operating parameters of the powered device based on the measured voltage. By adjusting power consumption levels dynamically according to the actual voltage received, the system can operate effectively even when voltage varies due to cable losses, thereby increasing the maximum usable power without violating voltage range limitations.
2Device complexity
If a fixed power level is supplied to powered devices, then the system operation is simplified, but voltage-dependent inefficiencies and brown-out issues occur
Solution Approach 1:
The patent implements a feedback mechanism where the powered device continuously measures the received voltage and uses this information to adjust its power consumption. This closed-loop control ensures stable operation by adapting to voltage variations, preventing brown-out issues while maintaining reasonable system complexity through integrated control functionality.
3Power
If the power level is increased to compensate for cable losses, then more power is available at the powered device, but the voltage range limitations are exceeded
Solution Approach 1:
The patent enables the powered device to dynamically adjust its power intake based on the actual voltage received. By monitoring voltage levels and adapting power consumption in real-time, the system can maximize power utilization without exceeding voltage range limitations, effectively compensating for cable losses through intelligent control rather than brute-force power increase.
Data Source
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AI summary
The invention relates to a powered device (2) like a luminaire for being used in a power distribution system (100), which is preferentially a PoE system and which comprises a power supply device (1). The powered device includes an electrical load like a light source, a voltage measurement unit for measuring a voltage received by the powered device, and an electrical load power providing unit for transforming power supplied by the power supply device to an electrical load power to be provided to the electrical load, wherein the power level of the electrical load power depends on the measured voltage. This allows adapting the power intake to the really received voltage, which may be reduced due to losses like cable losses, which in turn can lead to an increased intake power in comparison to the intake power of powered devices in accordance with the actual PoE IEEE 802.3at standard.