Power Management for Digital Cameras Using Backup File Allocation Tables
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Solution Overview
Problem
Battery-powered devices face sudden power loss issues, leading to potential file system corruption and battery capacity wastage, with existing solutions either wasting battery capacity or increasing development costs through complex power management.
Innovation Solution
Implementing a method that allows devices to operate until battery failure, using residual power to shut down properly and correct data anomalies, with a robust file system design that prevents loss of data objects during unexpected power loss, employing a shutdown bit and disable bit to manage device operation post-battery failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device disables operation when battery charge drops to a predetermined percentage, then sudden power loss and file system corruption are prevented, but battery capacity is wasted and device operation time is shortened
Solution Approach 1:
The system performs preliminary actions by creating checkpoints and backup copies of the file allocation table before potential power loss occurs. When power is suddenly lost, the system can revert to these pre-prepared backup states, eliminating the need to conservatively limit battery usage while maintaining file system integrity.
Solution Approach 2:
The system changes the state of the file allocation table by creating multiple versions (current and backup) and switching between them based on power availability. This parameter change approach allows the system to operate until battery depletion while maintaining data integrity through state transitions rather than conservative operation limits.
2Duration of action of moving object
If the device operates until battery failure occurs, then battery capacity is fully utilized, but file system corruption may occur due to unexpected power loss
Solution Approach 1:
The system prepares backup file allocation tables in advance during normal operation. When power failure occurs, these pre-prepared backups enable the system to recover without corruption, allowing the device to operate until complete battery depletion while maintaining file system reliability.
Solution Approach 2:
The system creates protective backup copies of critical file system data before power loss can occur. This cushioning mechanism ensures that even if the battery fails completely, the file system can revert to a known good state, enabling full battery utilization without compromising integrity.
3Reliability
If a robust file system with backup mechanisms is implemented, then data integrity is maintained during power loss, but device complexity and development costs increase
Solution Approach 1:
The file allocation table is segmented into multiple independent versions (current and backup copies). This segmentation allows the system to maintain simplicity by using basic copy and revert operations rather than implementing complex error correction or predictive algorithms, achieving data integrity through structural division.
Data Source
AI summary
A power management method and associated apparatus allows a device to make maximum use of its battery before replacement or recharging. After a battery failure, the device may be shut down properly and disabled until the battery is replaced or recharged. An exemplary embodiment is described in the context of a digital camera.