Regulator Input Current Scaling for Short Activity Bursts
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Solution Overview
Problem
In low-power applications like activity trackers and pedometers, existing regulators face challenges in dynamically scaling current consumption to optimize power savings, as computational activity varies over time, and current reduction strategies may not effectively manage activity durations to minimize power consumption.
Innovation Solution
A system with a controller that determines activity durations and thresholds to dynamically scale the current supplied to a regulator, either reducing or maintaining the current based on activity and standby periods, thereby optimizing power usage by adjusting the current levels during different data rate periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If current is reduced to save power, then power consumption decreases, but regulator reliability deteriorates due to potential electrical damage
Solution Approach 1:
The patent implements dynamic current scaling that adjusts the current supplied to the regulator based on real-time activity duration detection. The system transitions between different current levels (first current level during high activity, second current level during low activity) to optimize power consumption while maintaining regulator reliability through adaptive control rather than static current reduction
Solution Approach 2:
The system incorporates feedback mechanisms by monitoring activity duration and using this information to control current scaling decisions. The controller receives feedback about the regulator's operational state and adjusts current levels accordingly, preventing harmful current reductions while maximizing power savings during appropriate periods
2Loss of energy
If current is dynamically scaled, then power savings increase, but system complexity increases due to activity duration monitoring and control logic
Solution Approach 1:
The system performs preliminary detection of activity duration before making current scaling decisions. By pre-monitoring the activity duration and comparing it against threshold values, the system prepares the control logic in advance, simplifying the real-time decision-making process and reducing the complexity of the control architecture
Solution Approach 2:
The patent utilizes parameter changes in activity duration as the basis for current scaling decisions. By monitoring changes in activity duration parameters and comparing them against threshold values, the system triggers appropriate current level transitions, providing a simple and effective control mechanism that balances power savings with system complexity
3Productivity
If current reduction is applied during short activity periods, then average current consumption decreases, but power loss increases during transition periods
Solution Approach 1:
The system applies partial current reduction by transitioning to a second current level that is lower but not necessarily minimal. This partial action approach reduces average current consumption over time while avoiding the excessive power loss that would occur with aggressive current reduction during transition periods, achieving an optimal balance
Data Source
AI summary
A method and apparatus for performing dynamic current scaling of an input current of a voltage regulator are provided. The method and apparatus allow tuning current consumption in various applications, calculating a duration of an activity phase in which various algorithms are executed and activating dynamic current scaling of a regulator if the activity duration is shorter than a programmable threshold. A controller receives a threshold for an activity duration and a window size in which to evaluate the activity duration.