PoE PD Pulse Width Correction Circuitry
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Solution Overview
Problem
In Power over Ethernet (PoE) systems, the Maintain Power Signature (MPS) operation consumes power while devices are in low power mode, and existing standards lead to erroneous removal of power due to degraded MPS pulse widths, causing functional faults in devices like LED lighting and IP cameras.
Innovation Solution
The implementation of a circuitry system that measures load current and automatically generates and adjusts load pulses to maintain correct pulse widths, ensuring valid detection by Power Sourcing Equipment (PSE) while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If MPS operation is used to signal low power mode, then power consumption is reduced, but the MPS operation itself consumes power and pulse width degradation causes erroneous power removal
Solution Approach 1:
The patent implements a feedback mechanism where the PD measures the actual pulse width of generated MPS signals and compares it against the required minimum threshold. When degradation is detected, the system automatically adjusts the pulse generation parameters to maintain compliance, ensuring reliable power maintenance while minimizing consumption.
Solution Approach 2:
The PD performs self-diagnosis and self-correction by measuring its own MPS pulse widths and automatically adjusting generation parameters. This self-service approach ensures the system maintains reliable power signaling without external intervention, resolving the contradiction between low power consumption and reliable power maintenance.
2Use of energy by moving object
If pulse width is reduced to minimize power consumption, then energy savings increase, but detection accuracy by PSE deteriorates
Solution Approach 1:
The patent makes the MPS pulse generation dynamic by continuously monitoring actual pulse widths and adjusting generation parameters in real-time. This dynamic adaptation allows the system to use the minimum necessary pulse widths for reliable detection, optimizing the balance between energy savings and detection accuracy.
Solution Approach 2:
The system changes operational parameters (pulse width, amplitude, timing) based on measured conditions. By adjusting these parameters dynamically, the PD ensures pulses remain detectable by the PSE while minimizing power consumption, resolving the contradiction between energy savings and detection precision.
3Reliability
If automatic pulse width adjustment is implemented, then power maintenance reliability improves, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated circuits: the PD combines power management, pulse generation, pulse width measurement, and automatic adjustment capabilities in a unified system. This merging reduces overall device complexity while maintaining high reliability for power maintenance.
Solution Approach 2:
The PD implements multi-functional circuitry that performs both power management and MPS signal generation/adjustment. This universal approach consolidates functions that would otherwise require separate dedicated circuits, reducing complexity while ensuring reliable power maintenance through automatic pulse width correction.
Data Source
AI summary
In a Power over Ethernet (PoE) system, a Powered Device (PD) having circuitry to measure the load current from a Power Sourcing Equipment (PSE) in the PD. Circuitry compares the measured load current with a first threshold. Circuitry automatically generates load pulses for signaling the PSE. The pulse widths of the load pulses are measured and the widths are automatically adjusted, that power to the PD should be maintained.