PoE Power Providing System Decoupled Classification
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Solution Overview
Problem
In Power over Ethernet (PoE) systems, the mutual indication of the available power and class of Power Source Equipment (PSE) and Powered Device (PD) can be difficult, especially when the PD requires a certain number of current pulses for classification, but the PSE can only provide a lower number of voltage pulses for indicating available power.
Innovation Solution
A power providing system with a classification mode that decouples the determination of class between PSE and PD into two phases, where the PSE provides voltage pulses and the PD draws current pulses in the first phase, and vice versa in the second phase, allowing for improved mutual classification without being limited by the number of voltage pulses that indicate power availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the PSE provides voltage pulses to indicate available power and the PD draws current pulses to indicate its class simultaneously, then the classification procedure is simplified, but the mutual indication becomes difficult or impossible when the PD needs more current pulses than the PSE can provide
Solution Approach 1:
The classification procedure is segmented into two distinct phases: Phase 1 where the PSE provides voltage pulses and the PD draws current pulses for the PD to indicate its class, and Phase 2 where the roles are reversed or the PSE provides additional voltage pulses for indicating its class. This segmentation allows each phase to focus on one direction of information exchange, resolving the contradiction between simplification and complete mutual indication.
Solution Approach 2:
The PSE first performs the action of providing voltage pulses for the PD to indicate its class before attempting to indicate its own class. This preliminary action ensures that the PD's class is determined first, and then the PSE can provide additional pulses for its own classification without conflict.
2Power
If the PSE provides a limited number of voltage pulses to indicate available power, then power allocation is controlled, but the PD cannot determine the PSE's class accurately when more pulses are needed
Solution Approach 1:
The pulse provision is segmented into different purposes: initial pulses for PD classification and subsequent pulses for PSE classification. This allows the system to provide sufficient pulses for accurate mutual class determination while maintaining control over power allocation based on the determined classes.
Solution Approach 2:
The PSE provides voltage pulses preliminarily for PD classification first, determining the PD's class before using additional pulses to indicate its own class. This ensures accurate measurement of both classes without compromising power allocation control.
3Device complexity
If the classification procedure uses a fixed number of voltage pulses for power indication, then the system is simple to implement, but it cannot adapt when the PD requires a different number of current pulses for class indication
Solution Approach 1:
The classification system dynamically adjusts the number and purpose of voltage pulses based on the interaction between PSE and PD. The PSE can provide additional voltage pulses beyond the initial set if needed for its own classification, making the system adaptable to different PD requirements while maintaining a relatively simple implementation structure.
Data Source
AI summary
The invention relates to a power providing system (1) comprising a power providing device (2) like a PSE and an electrical device (4) like a PD. In a classification mode in a first phase the power providing device provides one or several voltage pulses and the electrical device draws one or several classification current pulses for indicating the class of the electrical device, wherein in a second phase the power providing device provides one or several voltage pulses for indicating the class of the power providing device. Thus, the indication of the classes of the electrical device and of the power providing device is decoupled in two different phases, which can lead to an improved mutual classification procedure.