Fan Speed Detection Logic for Series-Connected Cooling Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fan systems connected in series can fail to detect broken-down fans accurately due to rotational interference, leading to missed alarm signals when a fan is driven by other operational fans.
Innovation Solution
A fan system comprising a drive device, speed detecting device, and logic device that generates an alarm signal when the fan speed is too low, utilizing a signal processing unit and comparing unit to process and compare speed signals with a reference, ensuring accurate detection and prevention of missed alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fans are connected in series to improve heat dissipation efficiency, then heat dissipation performance is improved, but detection accuracy deteriorates because broken-down fans can be rotated by other fans causing missed alarm signals
Solution Approach 1:
The patent implements a feedback mechanism where the detection result (alarm signal) feeds back to indicate fan status. The logic device receives detection signals from all fans and generates alarm signals when abnormal conditions are detected, ensuring that the system can respond to actual fan states despite series connection interference.
Solution Approach 2:
The patent introduces a logic device as an intermediary between the fans and the detection system. This logic device processes detection signals from individual fans and generates alarm signals based on logical operations, effectively mediating the detection process to overcome the interference caused by series connection where one fan's rotation can affect others.
2Device complexity
If conventional detection methods are used to simplify the system structure, then device complexity is reduced, but reliability deteriorates due to misjudgment of broken-down fans
Solution Approach 1:
The detection system incorporates feedback mechanisms where alarm signals are generated based on logical operations of detection signals. This feedback loop ensures that the system continuously monitors and responds to actual fan conditions, improving reliability without significantly increasing structural complexity.
Solution Approach 2:
The logic device automatically processes detection signals and generates alarm signals without requiring external intervention. The system performs self-diagnosis and self-alarm functions, maintaining simplicity while improving reliability through automated logical operations on detection signals.
Data Source
AI summary
A fan system includes a driving device, a speed detecting device and a logic device. The driving device generates a speed detecting signal and a predetermined alarm signal. The speed detecting device, which is electrically connected with the driving device, receives the speed detecting signal, and generates a low speed signal when the speed detecting signal is lower than a reference signal. The logic device is respectively electrically connected with the driving device and the speed detecting device, and generates an alarm signal when the logic device receives the predetermined alarm signal or the low speed signal.