Portable Device Skin Temperature Control via Ambient-Responsive Fan Speed
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Solution Overview
Problem
Newer portable computing devices with smaller form factors face challenges in maintaining external enclosure temperatures within safe and comfortable ranges for human contact, as they generate similar or more heat than older devices despite their smaller size, and traditional thermal management solutions may not adequately address ergonomic concerns.
Innovation Solution
A portable computing device with a temperature sensor integrated into its case to measure external ambient temperature, using a cooling fan with speed control curves adjusted based on ambient temperature to maintain the skin temperature of the device's surface below acceptable levels, and employing internal thermal management mechanisms to throttle heat-generating components only after utilizing the full cooling capacity of the fan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the device uses smaller form factor to improve portability, then ease of carrying is improved, but the ability to dissipate heat worsens
Solution Approach 1:
The patent implements dynamic thermal management by making the cooling fan operation responsive to ambient temperature conditions. The system adjusts fan speed and activation based on real-time temperature sensing, allowing the device to adapt its cooling strategy to match environmental conditions, thereby effectively managing heat dissipation in compact form factors.
Solution Approach 2:
The system changes operational parameters (fan speed, cooling activation) based on ambient temperature measurements. By monitoring external ambient temperature and adjusting cooling fan operation accordingly, the device optimizes heat dissipation efficiency within its constrained form factor, preventing enclosure surface temperatures from exceeding safe thresholds.
2Reliability
If traditional thermal management solutions extract and expel heat to avoid component overheating, then component reliability is improved, but the enclosure surface temperature may exceed safe thresholds for user contact
Solution Approach 1:
The patent employs feedback control by using temperature sensors to continuously monitor ambient conditions and enclosure surface temperatures. This feedback information drives dynamic adjustment of cooling fan operation, allowing the system to maintain component temperatures within safe operating ranges while simultaneously preventing enclosure surface temperatures from reaching levels that would cause user discomfort or injury.
Solution Approach 2:
The cooling system transitions from static to dynamic operation, adjusting fan speed and activation based on real-time temperature monitoring. This dynamic approach allows precise control over heat dissipation, ensuring both component protection and user safety by adapting cooling intensity to actual thermal conditions.
3Object-affected harmful factors
If the cooling fan operates at high speed to maintain safe enclosure temperatures, then user comfort is improved, but energy consumption increases
Solution Approach 1:
The system applies partial cooling action by operating the fan at variable speeds rather than always at maximum capacity. The cooling intensity is matched to actual thermal demands, using only the necessary amount of cooling power required to maintain safe enclosure temperatures, thereby reducing unnecessary energy consumption while still ensuring user comfort.
Solution Approach 2:
The fan operational parameters (speed, activation state) are dynamically changed based on ambient temperature measurements. This allows the system to optimize energy consumption by adjusting cooling intensity to match actual thermal conditions, avoiding excessive energy use during periods when full cooling capacity is not required.
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
Effectively keeps the external surface temperature of the computing device at safe levels for user contact, enhancing user comfort and preventing discomfort or injury while allowing the device to operate efficiently by adjusting cooling strategies based on ambient conditions.
Implementation Method 1
a cooling fan configured to direct airflow through the portable computing device case
Implementation Method 2
The temperature sensor is configured to measure an external ambient temperature
Implementation Method 3
one or more internal thermal management mechanisms configured to control an internal temperature inside a case which houses computing device components
Data Source
AI summary
A method for controlling outer surface temperatures of a computing device enclosure or case includes operating one or more internal thermal management mechanisms to control an internal temperature inside the computing device enclosure or case, obtaining a measure of an external ambient temperature outside the computing device case, and making operation of the one or more internal thermal management mechanisms depend, at least in part, on the measure of the external ambient temperature.