Thermal Management via Dual-Sensor Workload Classification
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Solution Overview
Problem
Portable computing devices face challenges in effectively managing thermal energy generated during varying workloads, as existing thermal management schemes often fail to distinguish between steady and instantaneous workload-induced temperature changes, leading to sub-optimal thermal performance.
Innovation Solution
A system and method for thermal management in portable computing devices that differentiate between temperature changes caused by steady and instantaneous workloads by using on-chip systems to adjust clock frequencies, power supply voltage, and workload allocation across thermally aggressive components, based on readings from internal and external temperature sensors, to optimize thermal configurations for either steady or instantaneous workloads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal management schemes use a single threshold temperature to trigger cooling actions, then the device can respond to overheating conditions, but the system cannot differentiate between steady and instantaneous workloads leading to sub-optimal thermal performance
Solution Approach 1:
The patent segments temperature monitoring into two distinct sensor systems: internal temperature sensors positioned near heat-generating components and external temperature sensors positioned away from heat sources. This segmentation allows the system to differentiate between instantaneous temperature spikes (detected by internal sensors) and steady-state thermal conditions (detected by external sensors), enabling workload-type differentiation without requiring complex analysis of single sensor data.
Solution Approach 2:
The patent introduces temperature difference (delta temperature) as an intermediary metric that mediates between internal and external temperature readings. By calculating and comparing the difference between internal and external temperature changes, the system can infer workload characteristics without directly measuring workload parameters. This intermediary approach transforms raw temperature data into meaningful workload classification information.
2Temperature
If the processor initiates thermal management actions at threshold temperature, then thermal energy production is reduced, but device performance and productivity are compromised due to unnecessary throttling
Solution Approach 1:
The patent implements dynamic thermal management by continuously adjusting cooling actions based on real-time workload classification. Instead of static threshold-based responses, the system dynamically adapts its thermal management strategy: applying aggressive cooling only when instantaneous workloads cause harmful temperature spikes, and maintaining performance when steady workloads produce acceptable thermal conditions. This dynamic approach optimizes the balance between temperature control and device performance.
Solution Approach 2:
The patent establishes a feedback loop where temperature sensor readings continuously inform workload classification, which in turn guides thermal management decisions. The system monitors internal and external temperatures, classifies workload types based on temperature patterns, and adjusts cooling actions accordingly. This closed-loop feedback mechanism ensures thermal actions are taken only when genuinely necessary, preventing unnecessary performance throttling while maintaining effective thermal control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise thermal management, optimizing thermal performance by adjusting voltage and clock frequency settings and workload distribution, thereby enhancing the device's ability to handle temperature increases caused by different workload types, preventing overheating and improving overall device efficiency.
Implementation Method 1
temperature sensors positioned near the electronic circuitry that the PCD processor may monitor to determine if the PCD or portion thereof has reached a threshold or critical temperature
Implementation Method 2
allow the PCD to dissipate the excess thermal energy
Implementation Method 3
dissipate the excess thermal energy
Data Source
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AI summary
Thermal management in a portable computing device differentiates between a temperature increase caused by a steady workload and a temperature increase caused by an instantaneous workload. If it is determined that a detected temperature increase is caused by a steady workload, then a configuration of thermal parameters is applied that optimizes thermal performance for a steady workload. If it is determined that a temperature increase is caused by an instantaneous workload increase, then a configuration of thermal parameters is applied that optimizes thermal performance for an instantaneous workload. The device includes at least one first temperature sensor on an integrated circuit die and at least one second temperature sensor not on the integrated circuit die but within a housing of the portable computing device. The workload is determined by computing a difference between a first temperature value responsive to the at least one first temperature sensor and a second temperature value responsive to the at least one second temperature sensor and comparing the difference with a threshold value.