Battery Power Channel Control for Brown-Out Resistant Computing
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Solution Overview
Problem
Computing devices face brown-out scenarios due to increasing peak power demand exceeding available battery power, leading to potential device shutdown and performance degradation, as battery capacity decreases over its lifetime, making it challenging to predict and manage peak power demands across varying state-of-charge conditions.
Innovation Solution
A power management system with a controller that computes current limit values based on the battery's relative state-of-charge, using a two-stage regulator system to dynamically limit currents and adjust output voltages, thereby reducing power demand and preventing brown-out scenarios while minimizing performance impact on processing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery capacity is increased to extend device runtime, then the battery life is improved, but the device size and weight increase
Solution Approach 1:
The system dynamically changes the current limit parameter based on battery state-of-charge conditions. The controller adjusts current limits in real-time to match available battery capacity, allowing the device to operate efficiently with a smaller battery while preventing brown-out scenarios through adaptive parameter modification.
2Productivity
If the peak power demand is increased to improve processing performance, then the computing capability is improved, but the risk of brown-out scenarios increases
Solution Approach 1:
The system implements dynamic current limiting where the controller continuously monitors battery conditions and adjusts current limits accordingly. This dynamic adaptation allows the system to maximize processing performance when battery capacity is sufficient while automatically reducing power demand when battery state-of-charge decreases, thereby preventing brown-out scenarios.
Solution Approach 2:
The controller receives feedback about battery state-of-charge and voltage conditions, then computes appropriate current limit values. This closed-loop feedback mechanism ensures that processing performance is optimized while maintaining reliability by adjusting power limits based on real-time battery status.
3Reliability
If the current limit is dynamically adjusted based on battery state-of-charge, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The power management system is segmented into distinct functional blocks: a controller for computing current limits, a voltage regulator for enforcing current limits, and a sensor for monitoring battery conditions. This modular segmentation makes the complex system more manageable and implementable while maintaining reliability through coordinated operation of these specialized components.
4Volume of moving object
If the battery capacity is decreased to reduce device size, then the device volume is reduced, but the available peak power envelope decreases
Solution Approach 1:
The system compensates for reduced battery capacity by dynamically adjusting the current limit parameter. Instead of relying on a large fixed battery capacity, the system modifies the operational parameters (current limits) in real-time to extract maximum available power from the smaller battery, thereby maintaining the peak power envelope despite reduced battery volume.
Data Source
AI summary
Examples are disclosed that relate to controlling power from a battery on a computing device. One example provides a power management system for a computing device having a battery powering first and second processing units. The power management system comprises a controller. The controller is configured to receive a RSOC of the battery and compute first and second current limit values based at least on the RSOC. The power management system further comprises a first power channel including a first first-stage regulator having a current limiter. The current limiter is configured to dynamically limit, to the first current value, a first current flowing from the battery to the first processing unit. The power management system further comprises a second power channel including a second first-stage regulator having a current limiter configured to dynamically limit, to the second current limit value, a second current flowing from the battery.