PoE Powered Device Interface Classification Circuit
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Solution Overview
Problem
Current Power over Ethernet (PoE) standards lack an unambiguous classification method for high-powered devices, limiting power and load management, especially for devices requiring 15.4-60 watts, as they only provide a single class for such devices.
Innovation Solution
A powered device (PD) interface that includes a first and second rectifier bridge, with a classification current circuit communicating with both, outputting different classification currents based on the classification voltage received, allowing for five distinct class options for high-powered devices, ensuring compatibility with existing 'af' and 'at' standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single class is provided for all high powered devices with power requirements of 15.4-60 watts, then compatibility with existing standards is maintained, but power and load management cannot be provided for high powered devices
Solution Approach 1:
The patent segments the high-powered device classification by introducing multiple subclasses (4a, 4b, 4c, 4d) within the class 4 category. Each subclass corresponds to specific power ranges (15.4-30W, 30-45W, 45-50W, 50-60W), enabling granular power management while maintaining compatibility with existing standards that recognize class 4 as high-powered devices.
Solution Approach 2:
The patent applies local quality by providing different classification current values (35mA, 40mA, 45mA, 50mA) for different subclasses of high-powered devices. This allows the classification system to provide tailored power management for specific power requirements while maintaining the overall class 4 identification that ensures compatibility with existing PoE infrastructure.
2Measurement precision
If classification current values are increased to 35-50mA for high powered devices, then power allocation precision is improved, but ambiguity remains in classifying devices across different power ranges
Solution Approach 1:
The patent divides the high-powered device category into four distinct subclasses (4a, 4b, 4c, 4d), each with specific current values (35mA, 40mA, 45mA, 50mA). This segmentation eliminates ambiguity by providing a unique current value for each power range, while the parent class 4 designation ensures broad compatibility and coverage across all high-powered devices.
Solution Approach 2:
The patent changes the classification parameter from a single current value range to multiple discrete current values (35mA, 40mA, 45mA, 50mA) corresponding to different power ranges. This parameter refinement provides precise measurement of power requirements while maintaining adaptability through the hierarchical class 4 structure that encompasses all high-powered devices.
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
This solution enhances power management by providing five classes for high-powered devices, improving granularity and ensuring compatibility with existing standards, thereby enabling more precise power allocation and efficient load management.
Implementation Method 1
a first rectifier bridge; a second rectifier bridge, different than the first rectifier bridge
Implementation Method 2
a classification current circuit in electrical communication with the output and return of each of the first rectifier bridge and the second rectifier bridge
Data Source
AI summary
A powered device interface constituted of: a first and second rectifier bridge, the outputs and returns thereof in electrical communication with each other; and a selection circuit; and a classification current circuit in electrical communication with the output and return of each of the first rectifier bridge and the second rectifier bridge, and further in electrical communication with a first and second input of the first rectifier bridge, wherein the classification current circuit is arranged, responsive to a classification voltage received at one of the first rectifier bridge and the second rectifier bridge, to: in the event that the classification voltage is received at the first rectifier bridge, output a first classification current exhibiting a first magnitude; and in the event that the classification voltage is received at the second rectifier bridge, output a second classification current exhibiting a second magnitude.