Computing Device Thermal Management with Airflow Velocity Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices face challenges in accurately regulating surface temperatures due to variations within the device and environmental factors, leading to potential overheating and performance impairment, especially when placed in protective sleeves that restrict airflow.
Innovation Solution
A computing device equipped with an airflow detector, thermal sensor, and cover closure sensor that determines airflow velocity, cover status, and internal temperature to trigger a cooling action only when airflow velocity is low, the cover is closed, and the temperature exceeds a threshold, allowing precise temperature regulation without relying on fan speed data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is used to regulate temperature, then temperature control is improved, but the system cannot detect when airflow is restricted by protective sleeves
Solution Approach 1:
The patent introduces an airflow detector as an intermediary sensor that indirectly measures airflow conditions by detecting air velocity at a specific location within the device. This mediator allows the system to infer whether protective sleeves are restricting airflow without directly monitoring the sleeve's presence or the fan's performance, thereby resolving the detection precision issue while maintaining temperature control capability
Solution Approach 2:
The system implements feedback by continuously monitoring airflow velocity and using this information to adjust cooling operations. The airflow detector provides real-time feedback about airflow conditions, enabling the control system to distinguish between normal low-flow states (device in sleeve) and abnormal states, thereby improving temperature regulation accuracy under varying airflow conditions
2Speed
If cooling actions are triggered based on temperature alone, then response speed is improved, but false triggering occurs in airflow-restricted environments
Solution Approach 1:
The system performs preliminary detection of airflow conditions using the airflow detector before triggering cooling actions based on temperature thresholds. By checking airflow velocity in advance, the system determines whether the device is in a protective sleeve, thereby preventing false cooling triggers while maintaining rapid response capability when actual overheating occurs
Solution Approach 2:
The cooling control strategy dynamically adjusts based on real-time airflow conditions detected by the airflow detector. When low airflow is detected (indicating sleeve usage), the system modifies its temperature threshold response, allowing higher temperatures before triggering cooling actions, thereby adapting to the changed thermal environment and preventing false positives
3Device complexity
If fan speed data is used to monitor cooling effectiveness, then monitoring is simplified, but the system cannot detect airflow restriction caused by protective sleeves
Solution Approach 1:
The patent extracts the airflow detection function from the fan speed monitoring system by introducing a separate airflow detector. This extraction allows the system to independently measure actual air velocity without relying on inferred fan performance data, enabling direct detection of airflow restriction while keeping the overall monitoring architecture relatively simple through dedicated sensor functionality
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 solution enables precise and accurate temperature regulation, conserves computing resources, and prevents performance impairment or device failure by triggering cooling actions based on comprehensive conditions, even in airflow-restricted environments.
Implementation Method 1
a cooling fan inside the chassis configured to generate an airflow within at least a portion of the chassis
Implementation Method 2
a thermal sensor located within the chassis... determine, using the thermal sensor, a temperature of the computing device
Implementation Method 3
an airflow detector located within the chassis... determine, using the airflow detector, a velocity of the airflow
Data Source
AI summary
A computing device comprises a cover, a chassis, a cover closure sensor, and a cooling fan. An airflow detector and a thermal sensor are located within the chassis. The computing device comprises a processor and a memory storing instructions executable by the processor to detect a thermal trip condition using at least signals from the airflow detector, the thermal sensor, and the cover closure sensor. A cooling action is performed at least on condition of (1) determining that a velocity of an airflow within at least a portion of the chassis is less than or equal to a threshold velocity, (2) determining that the cover is closed, and (3) determining that a temperature of the computing device is greater than or equal to a threshold temperature.