Fan Speed Control to Prevent Rebound and Vibration
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Solution Overview
Problem
Speed adjustable fans in electronic devices experience rebound or vibration during heat dissipation, leading to noise and power consumption issues, and existing methods are inefficient in maintaining stable temperature control.
Innovation Solution
A method and device that adjust the fan speed based on predefined temperature points and a temperature tolerance limit, allowing the fan to stabilize within a range before adjusting, preventing rebound and vibration, and enabling intelligent control for fault handling and constant temperature maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan speed is adjusted frequently to respond to temperature changes, then the heat dissipation efficiency is improved, but the fan experiences rebound or vibration which increases noise and reduces stability
Solution Approach 1:
The control method performs preliminary actions by comparing temperature values with preset points before actual fan speed adjustment is needed. It predicts temperature trends and pre-adjusts fan speed to prevent temperature excursions, avoiding the need for frequent reactive adjustments that cause vibration and noise.
Solution Approach 2:
The control method implements periodic temperature sampling and comparison with preset points, adjusting fan speed in regular intervals rather than continuously. This periodic action smooths out fluctuations and prevents the rebound effect while maintaining effective heat dissipation.
2Measurement precision
If multiple temperature points and rotating speeds are set for precise control, then the temperature control precision is improved, but the control system complexity increases
Solution Approach 1:
The control method changes parameters by using preset temperature points and corresponding fan speed settings that can be configured without modifying the hardware structure. This allows precise temperature control through software parameter adjustment, maintaining simplicity while achieving high precision.
Solution Approach 2:
The control method implements feedback by continuously monitoring temperature values, comparing them with preset points, and automatically adjusting fan speed accordingly. This closed-loop feedback mechanism achieves precise control while keeping the system simple through automated decision-making based on temperature thresholds.
3Productivity
If the fan runs at high speed to dissipate heat quickly, then the heat dissipation efficiency is improved, but the power consumption and noise increase
Solution Approach 1:
The control method applies dynamics by adjusting fan speed dynamically based on real-time temperature conditions rather than running at constant high speed. The fan operates at variable speeds matched to actual cooling needs, reducing energy consumption while maintaining effective heat dissipation when required.
Solution Approach 2:
The control method changes the operating parameters of the fan by adjusting its speed based on temperature thresholds. Instead of maintaining high speed continuously, the fan speed parameter is varied according to thermal conditions, achieving energy efficiency without sacrificing heat dissipation capability when needed.
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
The solution ensures steady fan operation, prolongs the service life, and maintains a stable temperature, reducing noise and power consumption while effectively dissipating heat.
Implementation Method 1
a first temperature value of a specified temperature collecting point in the electronic device is obtained at a current rotating speed of the fan
Implementation Method 2
the main heat dissipation mode of the electronic devices is cooling by fans
Data Source
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AI summary
Provided are a method and device for controlling a rotating speed of a fan in an electronic device. The method includes the following steps: a first temperature value of a specified temperature collecting point in the electronic device is obtained at a current rotating speed of the fan (S102); a change value of the first temperature value in a first preset time period is obtained (S104); and when the change value is greater than a first preset threshold, the rotating speed of the fan is adjusted (S106). By means of the method and device, the technical problem that the rotating speed may experience rebound or vibration in a heat dissipation process of a speed adjustable fan can be solved, the steady running of the fan is ensured to a certain degree and the service life of the fan is prolonged.