Battery-Powered Security Peripheral Control for Predictable Battery Life
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Solution Overview
Problem
Existing battery-powered devices, particularly in security monitoring systems, face challenges in managing power usage due to variability in battery chemistry and brand, leading to inconsistent battery life and increased energy consumption in idle modes, which complicates the need for timely battery replacement without unnecessary waste.
Innovation Solution
A method to determine the initial energy capacity of the battery based on identification, classify battery chemistry, and adjust operating parameters of device elements to extend battery life, using Coulomb counting for active parts and monitoring energy usage to estimate remaining capacity, while minimizing power consumption by the fuel gauge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fuel gauge is used to monitor energy consumption, then battery life prediction is improved, but power consumption increases
Solution Approach 1:
The fuel gauge operates in a reduced capacity during idle periods, performing only essential measurements rather than continuous monitoring. This partial action approach provides sufficient battery life prediction while minimizing the power consumption overhead of the fuel gauge during low-activity periods.
Solution Approach 2:
The system transitions from continuous fuel gauge monitoring to periodic monitoring, where battery life prediction is updated at intervals rather than continuously. This periodic action maintains adequate prediction accuracy while significantly reducing the average power consumption during extended idle periods between security events.
2Duration of action of moving object
If operating parameters are adjusted to extend battery life, then battery lifetime is improved, but device performance deteriorates
Solution Approach 1:
The operating parameters of the device are made dynamic rather than static, allowing the system to adjust performance characteristics based on real-time battery status. When battery charge levels are high, the device operates at full performance; as battery charge decreases, parameters are dynamically adjusted to extend operation, creating a flexible balance between lifetime and performance.
Solution Approach 2:
The system changes operational parameters such as sampling rates, transmission frequencies, and processing intensity based on battery charge levels. This parameter adjustment allows the device to optimize for either performance or battery preservation depending on the current energy state, resolving the contradiction between maintaining high performance and extending battery life.
3Ease of manufacture
If battery replacement is delayed, then maintenance cost is reduced, but system reliability deteriorates
Solution Approach 1:
The system implements continuous feedback monitoring of battery charge levels and operational patterns to predict remaining battery life with high accuracy. This feedback mechanism enables timely notification to users before battery depletion occurs, allowing them to schedule maintenance at optimal moments - not too early (avoiding unnecessary cost) and not too late (maintaining reliability).
Solution Approach 2:
The system performs preliminary assessment of battery status and predicts future depletion dates in advance, enabling proactive scheduling of battery replacement. This preliminary action allows users to plan maintenance activities optimally, balancing the cost of early replacement against the risk of system failure from delayed replacement.
Data Source
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AI summary
Provided is a method of controlling power usage in a battery powered device, the device being a peripheral of a security monitoring system, the device including a battery power supply, the method comprising: determining an initial energy capacity of the battery power supply based on an identification of the battery power supply; and based on the determination of the initial energy capacity of the battery power supply, selecting operating parameters of elements of the device to control power usage of the device to achieve a desired lifetime for the battery power supply.