Redundant PoE PD Controller Inrush Current Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Power over Ethernet (PoE) systems face challenges in providing redundant power without interrupting output when multiple PD circuits are connected to a shared DC-DC converter, leading to issues like inrush current limitations and foldback protection triggering, which can result in power disruptions and failure to achieve redundancy.
Innovation Solution
The implementation of improved PD controllers that manage the connection to a shared DC-DC converter by refraining from turning it off during inrush current delays, allowing current flow only after the delay is complete, and selectively reducing power consumption to avoid foldback actions, ensuring continuous uninterrupted power to the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PD controller turns off the shared DC-DC converter during inrush current delay, then the PSE inrush current limitation is respected, but power interruption occurs to the load
Solution Approach 1:
The PD controller performs preliminary actions by delaying the turn-off of the DC-DC converter until after the PSE inrush current delay period expires. This timing-based preliminary action allows the PSE to complete its inrush current handling before the converter is switched off, preventing power interruption while respecting current limitations.
Solution Approach 2:
The system dynamically adjusts the operation of the DC-DC converter based on the connection state of multiple PSEs. When a second PSE connects, the controller dynamically determines whether to maintain or turn off the converter based on timing conditions and power delivery state, optimizing both power continuity and inrush current management.
2Reliability
If multiple PD circuits connect to a shared DC-DC converter simultaneously, then redundant power paths are established, but foldback protection triggers causing power disruption
Solution Approach 1:
The PD controller implements feedback mechanisms to monitor the power delivery state and connection status of multiple PSEs. This feedback allows the controller to detect when foldback protection conditions are approaching and adjust its operation accordingly, preventing power disruption while maintaining redundant power paths.
Solution Approach 2:
The controller performs preliminary assessment of the power delivery state before allowing multiple PSEs to fully connect. By evaluating conditions in advance and sequencing connections appropriately, the system prevents foldback protection triggering while establishing redundant power paths.
3Adaptability or versatility
If conventional PoE procedures are used with redundant inputs, then each input can be independently managed, but incompatibility arises when one PSE is already powering the converter
Solution Approach 1:
The PD controller is designed with multi-functionality to handle both single and multiple PSE connections using a unified control approach. It universally manages power delivery, inrush current delays, and foldback protection across different connection scenarios, eliminating the need for separate conventional procedures and improving compatibility.
Data Source
AI summary
Disclosed examples include redundant Power over Ethernet (PoE) systems, powered device (PD) controllers and methods in which a first PD controller sends a signal to indicate to the other PD controllers that the first PD controller is powered, and a second PD controller newly connected or reconnected to a corresponding power sourcing equipment (PSE) refrains from turning off a shared DC-DC converter, and the second PD controller waits to allow an inrush current delay of the corresponding PSE to complete before allowing current flow between the DC-DC converter and the corresponding PSE, and the second PD controller selectively provides a signal to request an application circuit powered by the DC-DC converter to temporarily reduce its power consumption below a predetermined value if the corresponding PSE is configured to provide no more than the predetermined value of power.