Power Sourcing Equipment Detecting Power Transients for Seamless Backup Transition
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Solution Overview
Problem
In power over Ethernet (PoE) systems, the transition from a backup power source to a primary power source is not seamless, leading to disruptions and inconsistent behavior in powered devices (PDs) when the local power source fails, due to reliance on real-time communication from the PD for power transition.
Innovation Solution
The Power Sourcing Equipment (PSE) detects power disruptions by monitoring for legal transients in current and voltage, allowing it to transition from a secondary to a primary power source without explicit PD communication, ensuring a quick and efficient power increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PSE relies on real-time communication from the PD for power transition, then the system can confirm power status accurately, but the transition from backup to primary power source is delayed and causes disruptions
Solution Approach 1:
The PSE performs preliminary detection of power transients on the Ethernet cable before a power failure occurs. By monitoring for the presence of a powered device and detecting power transients in advance, the PSE is already prepared to immediately switch from backup to primary power source when a failure occurs, eliminating the need for delayed real-time communication during the transition.
2Speed
If the PSE monitors for power transients continuously, then the transition speed increases, but the system complexity and detection requirements increase
Solution Approach 1:
The powered device itself generates the power transient signature by its normal operation and power state changes. The PSE leverages this self-generated signal from the PD to detect power status and transitions, rather than requiring a separate complex detection system. The PD's own power consumption patterns serve as the detection mechanism.
Data Source
AI summary
A system and method for power sourcing equipment (PSE) detection of a powered device (PD) power failure for power backup. A PSE can power a PD at a low level of power as a backup power source. Upon a failure in the PDs primary power source, the PSE can detect a transient (e.g., current and/or voltage) on the PD load as a signal that the PD requires additional power. The PSE can then allocate increased power to the port by entering into an active state as compared to a backup state. As the PSE is responsive to the detection of the transient, the PSE need not rely on a real-time communication from the PD.