Dynamic Fan Speed Control Circuit Using Ambient and Device Temperature Sensors
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Solution Overview
Problem
Existing methods for controlling cooling fan rotation speed in computers fail to prevent excessive fan speed during low load states, leading to unnecessary noise and potential CPU performance reduction, and often require additional cooling devices to achieve noise reduction, increasing cost and complexity.
Innovation Solution
A dynamic rotation speed control circuit and method that receives ambient and device temperatures to determine optimal fan rotation speeds using a fan rotation speed description table, allowing the fan to operate at reduced speeds during low load states without additional cooling devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fan rotation speed is controlled taking the computer's peak load state into consideration, then the cooling performance is ensured, but the fan rotation speed in the low load state is excessively high and noise is unnecessarily loud
Solution Approach 1:
The fan rotation speed is dynamically adjusted based on the current load state of the computer. The control unit receives temperature information from temperature sensors and determines the appropriate fan speed according to the detected temperature, allowing the fan to operate at different speeds matching the actual cooling needs rather than maintaining a fixed high speed for peak load conditions
Solution Approach 2:
The system uses temperature sensors to continuously monitor the internal temperature of the computer and feeds this information back to the control unit. The control unit then adjusts the fan rotation speed based on this feedback, creating a closed-loop control system that optimizes fan speed according to actual thermal conditions, preventing both overheating and unnecessary noise
2Object-generated harmful factors
If another cooling device is activated instead of the fan when CPU temperature exceeds threshold, then noise is reduced, but cost and device complexity increase
Solution Approach 1:
The existing fan cooling system is optimized to serve itself through intelligent control. By equipping the system with temperature sensors and a control unit that automatically adjusts fan speed based on detected temperatures, the fan can operate efficiently without requiring additional cooling devices or complex multi-device coordination systems
Data Source
AI summary
A first reception unit receives “ambient temperature” which is a temperature of surroundings where the computer is installed. A second reception unit receives “first device temperature” which is a temperature of a first device provided in the computer. A third reception unit receives “second device temperature” which is a temperature of a second device provided in the computer. A fan rotation speed indicating unit determines the rotation speed of the fan based on a comparison between the ambient temperature, first device temperature, and second device temperature which are received by the first to third reception units and a fan rotation speed description table describing a relationship between the respective temperature and fan rotation speed and instructs the fan to rotate at the determined rotation speed.