Indirect Thermal Fan Control Using Air Temperature and Current Draw
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Solution Overview
Problem
Conventional fan speed control in electronic devices relies on direct temperature measurements, which are expensive and impractical in component-dense locations, leading to conservative fan speeds that result in wasted energy and excessive noise.
Innovation Solution
Indirect thermal fan control adjusts fan speed based on air temperature and current draw of electrical components, allowing for efficient airflow management without direct temperature sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct temperature sensors are used to control fan speed, then cooling reliability is improved, but device cost and complexity increase
Solution Approach 1:
The patent uses ambient air temperature as an intermediary parameter to infer component temperature. Instead of directly measuring component temperature with sensors, the system measures the temperature of air entering the enclosure and uses this as a proxy to determine appropriate fan speeds for cooling components, thereby avoiding the complexity of placing sensors in dense component locations
Solution Approach 2:
The patent replaces the mechanical/physical sensor measurement approach with an computational inference approach. By using ambient air temperature measurements combined with power consumption data and thermal models, the system substitutes direct physical sensing with indirect measurement and calculation to determine component temperature and control fan speeds
2Object-affected harmful factors
If fan speed is reduced to lower noise levels, then user experience is improved, but cooling effectiveness deteriorates
Solution Approach 1:
The patent implements a feedback control system that continuously monitors ambient air temperature and power consumption, then adjusts fan speed accordingly. This closed-loop feedback allows the system to maintain optimal cooling effectiveness at the lowest necessary fan speeds, preventing both over-cooling (wasted energy) and under-cooling (insufficient heat dissipation)
Solution Approach 2:
The patent employs dynamic fan speed adjustment based on real-time conditions rather than fixed speed settings. Fan speeds are continuously adapted according to changing ambient temperatures and component power consumption levels, allowing the system to optimize the balance between noise reduction and cooling effectiveness under varying operational conditions
3Reliability
If conservative high fan speeds are used without direct temperature measurement, then cooling safety is improved, but energy consumption increases
Solution Approach 1:
The patent changes the control parameter from direct component temperature to ambient air temperature combined with power consumption data. By using these alternative parameters along with thermal models, the system can accurately determine appropriate fan speeds without conservatively maintaining high speeds, thereby reducing energy consumption while preserving cooling safety
Solution Approach 2:
The patent substitutes direct temperature sensing with a computational approach using ambient temperature and power consumption measurements. This replacement allows for more precise, condition-based fan control rather than conservative high-speed operation, significantly reducing unnecessary energy consumption while maintaining cooling safety through accurate thermal modeling
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 reduces energy waste and noise levels while ensuring sufficient cooling, improving fan efficiency and user experience by leveraging indirect measurements to estimate component temperatures.
Implementation Method 1
a speed of a fan may then be adjusted based on the temperature of the air and the current draw of the component to change a flow of the air over the electrical component
Data Source
AI summary
Indirect thermal fan control is described. In one or more implementations, a speed of a fan may be adjusted based on indirect measurements of temperature. For example, a temperature of air entering an enclosure and a current draw of an electrical component within the enclosure may be determined. A speed of a fan may then be adjusted based on the temperature of the air and the current draw of the component to change a flow of the air over the electrical component.