Power-Triggered Fan Activation To Reduce 5 kHz Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Computing systems emit a narrowband noise at 5 kHz during heavy workloads, which is highly noticeable and degrades the user experience due to increased sharpness, despite low amplitude.
Innovation Solution
Control the fan based on system power level rather than temperature alone, activating it to generate a broadband noise that complements the narrowband noise, reducing overall sharpness by introducing additional frequency components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the fan is controlled based on temperature threshold alone, then the subcomponent temperature is maintained within safe limits, but the fan activation is delayed until temperature rises, allowing narrowband noise to degrade user experience
Solution Approach 1:
The system performs preliminary action by detecting system power level increases before temperature rises occur. When the power level exceeds a threshold, the fan is activated in advance of any temperature-based trigger, preventing the narrowband noise degradation from occurring in the first place. This proactive approach based on power consumption patterns allows the fan to be ready before thermal conditions deteriorate.
2Object-affected harmful factors
If the fan is activated at low speeds to reduce noise, then user comfort is improved, but the cooling effectiveness may be insufficient under heavy workloads
Solution Approach 1:
The system implements dynamic fan speed control by continuously monitoring both power level and temperature, adjusting the fan speed in real-time based on current operating conditions. The fan operates at variable speeds rather than fixed settings, allowing optimal balance between noise reduction and cooling effectiveness as workload and thermal conditions change.
Solution Approach 2:
The system changes operational parameters by using power level as an additional control parameter alongside temperature. Instead of relying solely on temperature thresholds, the system incorporates power consumption level as a trigger parameter, enabling earlier fan activation and more nuanced control that prevents narrowband noise while maintaining adequate cooling.
3Object-affected harmful factors
If the fan is activated early based on power level, then narrowband noise is prevented, but additional power is consumed by the fan during light workloads
Solution Approach 1:
The system introduces power level as a new control parameter to trigger fan activation before temperature-based systems would activate. By monitoring system power consumption and comparing it against thresholds, the fan can be activated based on workload intensity rather than thermal conditions alone, preventing narrowband noise from occurring in the first place.
Solution Approach 2:
The system takes preliminary action by activating the fan based on power level increases before temperature rises occur. This proactive approach prevents the need for higher-speed fan operation later, as the fan is already running at a baseline level when the workload increases, thereby preventing narrowband noise without excessive power consumption.
Data Source
AI summary
A method of operating a fan of a computing system includes: measuring a temperature of a subcomponent of the computing system; and comparing the temperature to a temperature threshold. When the temperature is greater or equal to than the temperature threshold, the fan is controlled based on a predetermined table of fan level settings. When the temperature less than the temperature threshold, a fan speed of the fan is measured. When the fan speed is not equal to zero, the method returns to the measurement of the temperature. When the fan speed is equal to zero, the fan is controlled based on a first power determination. The first power determination includes: measuring a system power level; and comparing the system power level to a trigger threshold. When the system power level is greater than the trigger threshold, the fan is activated to a predetermined setting.