Power Receiving Device Preliminary Notification for Log Saving
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Solution Overview
Problem
Power feeding devices stopping power supply to PoE-capable communication devices without notification can result in unsaved logs and operational disruptions, as storage of logs may not be completed in time.
Innovation Solution
Implementing a power receiving device and power feeding device system that provides a preliminary notification of power supply stopping, allowing the device to execute necessary processes before the actual shutdown, with the power feeding device controlling power supply based on a preset schedule and notifying connected devices of impending power stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power feeding device stops power supply immediately without notification, then the power supply control is simple and responsive, but the communication device cannot save logs and data loss occurs
Solution Approach 1:
The power feeding device sends a preliminary notification to the communication device before stopping power supply. This allows the communication device to perform preliminary actions such as saving logs and data to non-volatile storage before the actual power cutoff, thereby preventing data loss while maintaining relatively simple control logic
2Reliability
If the power feeding device provides preliminary notification, then the communication device can save logs and complete processes, but the power supply control becomes more complex
Solution Approach 1:
The system implements preliminary action by notifying the communication device in advance before power cutoff. The notification triggers the communication device to execute data saving operations and complete ongoing processes, ensuring reliability without requiring complex real-time monitoring or emergency response mechanisms
Solution Approach 2:
The power feeding device incorporates feedback mechanisms to monitor the status of connected communication devices. Based on this feedback, the controller intelligently determines the optimal timing for power cutoff, balancing the need for data integrity with efficient power management and avoiding unnecessary delays
3Productivity
If the power supply is stopped without advance notice, then the power management is efficient and responsive, but operational disruptions occur
Solution Approach 1:
By implementing preliminary notification before power cutoff, the system allows communication devices to gracefully complete operations and save data. This maintains operational continuity and prevents disruptions while adding minimal overhead to power management efficiency through a simple notification-and-wait mechanism
4Reliability
If the power feeding device waits for communication device to complete processes, then data loss is prevented, but the power supply response time increases
Solution Approach 1:
The power feeding device uses feedback from the communication device to determine when to execute power cutoff. The controller monitors status indicators from the communication device and automatically proceeds with power shutdown once data saving is confirmed or time expires, preventing data loss without requiring excessive waiting time or manual intervention
Data Source
AI summary
A power receiving device includes a connector configured to be connected to a power feeding device; a power source configured to receive a power supply from the power feeding device via the connector; and a controller configured to perform a predetermined process before a power supply stopping time in response to receiving a preliminary notification of power supply stopping from the power feeding device via the connector.