Two-Stage Thermal Throttling for Mobile Temperature Overshoot
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Solution Overview
Problem
Mobile devices face challenges in controlling temperature without hardware cooling solutions, leading to potential damage from excessive heat, with existing software controls causing user experience degradation or high temperature overshoot.
Innovation Solution
Implementing a two-stage thermal throttling system with an auxiliary proportional controller to manage initial temperature increases, followed by a main PI controller for more aggressive throttling, using historical data transfer to optimize thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single aggressive thermal throttling controller is used, then temperature control effectiveness is improved, but user experience deteriorates due to performance degradation
Solution Approach 1:
The thermal control system is segmented into two distinct controllers: an auxiliary controller that activates first with less aggressive throttling to maintain user experience, and a main controller that activates later with more aggressive throttling to ensure temperature control. This segmentation allows the system to balance performance and thermal management at different temperature stages.
2Productivity
If thermal throttling is delayed until high temperature is reached, then user experience is maintained, but temperature overshoot increases causing damage risk
Solution Approach 1:
The auxiliary controller performs preliminary thermal management by activating at a lower temperature threshold with gentle throttling actions. This preliminary action prevents temperature from rising too rapidly, reducing the risk of temperature overshoot while maintaining user experience during moderate thermal conditions.
3Measurement precision
If historical data accumulation is required for thermal control, then control accuracy is improved, but response time deteriorates
Solution Approach 1:
The auxiliary controller collects and processes thermal historical data during its activation period, preparing the system for more accurate main controller operation. This preliminary data accumulation occurs in the background without delaying the main controller's response when high temperature conditions require immediate intervention.
Data Source
AI summary
Techniques and apparatuses are described that implement two-stage thermal throttling. In some examples, two-stage thermal throttling of a mobile device is achieved using a main controller and an auxiliary controller. The auxiliary controller can be a proportional controller that monitors a temperature and a rate of change of the temperature of the mobile device during operations. When a first temperature threshold and a threshold rate of increase of the temperature are exceeded by the mobile device, the auxiliary controller can throttle a metric of the device to slow down the rate of increase of the temperature. After the temperature has exceeded a second temperature threshold, the auxiliary controller can hand off control to the main controller, which can further throttle the metric of the device or one or more additional metrics of the device.