PoE Port Power Control for Fast Source-Failure Shutdown
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Solution Overview
Problem
Existing PoE systems with multiple power source devices face challenges in rapidly shutting off power to specific ports when a power source device fails, especially in systems with a high ratio of power consuming devices to power source devices, leading to reduced selectivity and scalability issues.
Innovation Solution
A control device with multiple control circuits connected to power source devices and port switches, utilizing a detection circuit, look-up-table memory, and a control signal generating circuit to rapidly adjust power supply based on power supply state changes, with a serial bus for efficient communication and dynamic port control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power source devices are used to increase power supply capacity, then the total power supply capability is improved, but the complexity of power management and control increases
Solution Approach 1:
The patent combines multiple power source devices into a unified PoE system with centralized control. The control device aggregates power from multiple PoE power supplies and non-PoE power supplies, managing them as a single integrated power source. This merging approach increases total power capability while maintaining manageable system complexity through unified control logic and standardized power delivery mechanisms.
Solution Approach 2:
The control device is designed to accept power from multiple types of power sources (PoE and non-PoE) and distribute it universally to various power consuming devices through Ethernet ports. This multi-functional capability allows the system to adapt to different power source configurations and serve diverse device types, resolving the contradiction between power capability and management complexity.
2Reliability
If power is rapidly shut off to specific ports when a power source fails, then system stability is improved, but the response time requirement increases system complexity
Solution Approach 1:
The control device continuously monitors the operational status of all power source devices and pre-calculates power distribution configurations. When a power source failure is detected, the system has pre-prepared power shutdown plans for specific ports, enabling rapid response within 20ms (preferably 2ms) without requiring complex real-time decision-making algorithms during the failure event.
Solution Approach 2:
The system implements continuous feedback monitoring of power source status and power consumption at each port. This feedback mechanism allows the control device to detect power source failures immediately and automatically adjust power distribution by shutting off specific ports, maintaining system stability while using relatively simple control logic driven by real-time status information.
3Adaptability or versatility
If the system supports a high ratio of power consuming devices to power source devices, then scalability is improved, but the selectivity of power control decreases
Solution Approach 1:
The control device segments the power control function by individually controlling power delivery to each Ethernet port through separate control circuits. This segmentation allows the system to support a high ratio of power consuming devices to power source devices while maintaining full selectivity, as each port can be independently monitored and controlled based on power availability and device requirements.
Solution Approach 2:
The system implements dynamic power allocation where the control device continuously adjusts power distribution based on real-time conditions. When multiple power consuming devices are connected, the system dynamically determines which devices receive power and which are shut off, maintaining optimal power utilization and control selectivity regardless of the high device-to-power-source ratio.
Data Source
AI summary
Control device for a power over Ethernet system having multiple power source devices comprises plural control circuits and a signal bus connecting them. Each control device connects plural power source devices and plural port switches, which controls power supply to a port to be connected by a power consuming device. Detection circuit detects at least one power supply state combination. Control signal generator picks up a power control combination signal corresponding to a detected power supply state combination from a power supply to power control look-up-table, upon change in the power supply state and provides the power control signals to corresponding port switches.