Power Management for PoC Devices Preventing Overrun Loops
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Solution Overview
Problem
Power-over-cable systems face limitations in power distribution due to voltage constraints, leading to power overruns and endless loops of shutdowns and reboots, especially in complex configurations with longer cables, where identifying the causative device is challenging.
Innovation Solution
Implementing a method that allows PoC devices to operate in low and high power modes, with a processing device managing power changes by reading a power change record to restrict devices causing power overruns, preventing them from switching to high power mode and storing flags to maintain a stable configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If PoC devices are allowed to switch to high power mode to meet increasing power demands, then power delivery capability is improved, but power overruns and system shutdowns occur due to cable losses and voltage constraints
Solution Approach 1:
The system dynamically adjusts power delivery by switching between low power mode and high power mode based on real-time power availability and consumption conditions. The power source equipment and PoC devices can transition between operational states to optimize power utilization while preventing overruns that would cause system shutdowns.
Solution Approach 2:
The patent changes the operational parameters of PoC devices by switching between different power modes (low power mode and high power mode). This parameter change allows the system to adapt to varying power conditions, enabling high power operation when available and low power operation when constrained by cable losses or voltage limits, thereby resolving the contradiction between power delivery capability and system stability.
2Reliability
If the system restricts devices to low power mode to prevent power overruns, then system stability is improved, but power consumption capability deteriorates
Solution Approach 1:
Rather than statically restricting devices to low power mode, the system dynamically determines the appropriate power mode based on current system conditions. The power source equipment monitors power availability and communicates with PoC devices to enable high power mode when conditions permit, thereby maintaining system stability while maximizing power consumption capability when safe to do so.
Solution Approach 2:
The system performs preliminary power mode determination before full operational activation. By assessing power availability and device requirements in advance, the system can pre-establish appropriate power modes, preventing power overruns while ensuring devices operate at optimal power levels from the outset, thus maintaining both stability and power consumption capability.
3Adaptability or versatility
If multiple PoC devices are connected to extend system coverage, then system versatility is improved, but total power consumption capacity increases beyond available power supply
Solution Approach 1:
The system segments power allocation by port, with each port independently managing power delivery to connected PoC devices. The power source equipment divides its total power capacity across multiple ports, allowing each port to support devices according to available power. This segmentation enables system versatility through multiple connections while preventing total power consumption from exceeding supply capacity.
Solution Approach 2:
Different ports or device groups are assigned different power mode characteristics based on local power availability and requirements. The system applies local quality control by enabling high power mode for devices connected to ports with sufficient power headroom while restricting low power mode for ports approaching power limits, thereby achieving both system versatility and power balance.
4Adaptability or versatility
If the system allows devices to switch power modes dynamically to meet varying demands, then adaptability is improved, but the risk of power overruns and shutdown loops increases
Solution Approach 1:
The system implements feedback mechanisms where power source equipment continuously monitors power delivery status and communicates with PoC devices about power mode appropriateness. This feedback loop allows devices to switch power modes adaptively while receiving real-time guidance from the power source, preventing uncontrolled switching that would cause power overruns and shutdown loops.
Solution Approach 2:
The system prepares for potential power overruns by implementing preventive measures before they occur. The power source equipment assesses power availability in advance and proactively manages device power modes to maintain a safety margin, cushioning against conditions that would trigger shutdowns. This beforehand cushioning allows adaptive power mode switching while preventing the formation of dangerous feedback loops.
Data Source
AI summary
The invention relates to power over data cable (PoC) systems comprising power source equipment, PSE, and plural PoC devices connected to the PSE. The PoC devices can operate in various power modes including low and high power modes. A method of managing power performed by a processing device of the system upon starting-up includes: reading, in memory of the processing device, a power change record to determine if, prior to the start-up, a target PoC device was about to switch from the low power mode to the high power mode; if it was about to switch, restricting it to remain in the low power mode; otherwise, triggering the target device to switch to the high power mode. As being restricted to the low power mode, the target device can no longer cause power failures. Thus endless loops of power failures caused by one and the same device are avoided.