PoE Load Segmentation for Detection Accuracy
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Solution Overview
Problem
The accuracy of powered device validity detection in Power over Ethernet (PoE) systems is low due to varying resistance values of different powered loads, affecting power supply safety.
Innovation Solution
A communications device and method that utilize a determining unit and control unit to manage the connection states of loads within the device, ensuring the first load is in a connected state for detection while the second load is disconnected, preventing interference and allowing for accurate validity detection without affecting data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PSE applies current to the powered load in the PD for validity detection, then power supply can be provided to valid PDs, but the detection accuracy is low due to varying resistance values of different powered loads
Solution Approach 1:
The patent segments the powered device into multiple loads (first load and second load) with different connection states. The first load is connected during detection to provide a standard impedance, while the second load is disconnected to avoid interference. This segmentation allows the detection to be performed on a controlled portion of the device rather than the entire powered load, thereby improving detection accuracy while maintaining power supply safety.
Solution Approach 2:
The patent extracts the detection function from the general powered load measurement by using a separate first load that is specifically connected during the detection phase. This extracted detection load provides a known impedance value that the PSE can use for accurate validity detection, separating the detection measurement from the variable impedance of the actual powered device operation.
2Adaptability or versatility
If multiple loads are present in the PD, then the device can perform both detection and power consumption functions, but the detection accuracy deteriorates due to interference between loads
Solution Approach 1:
The patent applies dynamics by controlling the connection states of different loads based on the detection phase. The first load is dynamically connected during detection, while the second load is dynamically disconnected during detection but can be connected during normal operation. This dynamic state control allows the system to maintain both detection and power consumption functions while eliminating interference during detection, thereby preserving both versatility and accuracy.
Data Source
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AI summary
This application provides a communications device and a validity detection method. The communications device is a first communications device, including: a determining unit, configured to determine that a current state is a first state; and a control unit, configured to control a first load to be in a connected state, where a second load is in a disconnected state in all or a part of a time in which the first load is in the connected state, and the control unit is further configured to control the second load to be in the connected state.