Serial Fan Speed Control via Threshold Switching
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Solution Overview
Problem
Conventional fan control methods for serial-connected fans limit the rotation speed of downstream fans, reducing heat dissipation efficiency and increasing the complexity of component preparation, while also failing to protect control circuits from excess power.
Innovation Solution
A control method that dynamically adjusts the rotation speed of serial-connected fans by acquiring and comparing control factors (voltage, current, or power) against threshold values, executing different control procedures to optimize performance and prevent power-related damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotation speed of downstream fan is limited by conventional control method, then the control circuit is protected, but the heat dissipation ability is decreased
Solution Approach 1:
The patent implements dynamic control of fan rotation speeds by detecting the rotation speed of the upstream fan and adjusting the downstream fan's speed accordingly. The control circuit dynamically switches between different control modes (first control mode when upstream fan speed is below threshold, second control mode when above threshold), allowing the system to adapt to varying operating conditions while protecting the control circuit from excessive power.
2Productivity
If the rotation speed of downstream fan is increased due to upstream fan effect, then heat dissipation improves, but the control circuit may be damaged by excess power
Solution Approach 1:
The patent employs feedback control by detecting the rotation speed of the upstream fan and using this information to control the downstream fan's rotation speed. The control circuit continuously monitors the upstream fan's speed and adjusts the downstream fan's operation based on the detected values, creating a closed-loop control system that prevents excessive power consumption while maintaining optimal heat dissipation performance.
3Productivity
If multiple control modes are implemented, then system performance is optimized, but control circuit complexity increases
Solution Approach 1:
The patent implements multiple control modes by changing the control parameters based on the upstream fan's rotation speed. When the detected speed is below a threshold, the first control mode is applied; when above the threshold, the second control mode is applied. This parameter-based switching allows the system to optimize performance across different operating conditions while keeping the control logic relatively simple and manageable.
Data Source
AI summary
A control method of a fan rotation speed, which controls the operation of a fan set including fans connected in series, is disclosed. The control method includes the steps of acquiring a control factor; judging whether the control factor is less than a first threshold value; executing a first control procedure when the control factor is less than the first threshold value; judging whether the control factor is greater than a second threshold value when the control factor is greater than the first threshold; executing a second control procedure when the control factor is greater than the second threshold value; and executing a third control procedure when the control factor is less than the second threshold value.