Alarm Circuit for Fan Control and Abnormal Signal Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electronic systems with micro control units (MCUs) face issues of malfunction or damage due to external factors, leading to inefficient heat dissipation and excessive power consumption, as well as misconnection problems causing continuous operation of fans, which can result in damage and shutdown of the entire apparatus.
Innovation Solution
An electronic system and alarm device featuring a first and second detecting unit, along with a controlling unit, that generate detecting signals to determine abnormal status and output a control signal to stop the operation of electronic devices, preventing damage by placing them in a standby mode when an abnormal status is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the micro control unit continuously controls the fan operating at high-speed or low-speed rotation status due to malfunction, then the fan may be damaged, but the system lacks the capability to detect and alarm the abnormal status
Solution Approach 1:
The detecting unit continuously monitors the input signal level before the malfunction causes damage. By detecting abnormal status (continuous high-level or low-level signal) in advance and triggering an alarm, the system enables preventive action to be taken before the fan is damaged, resolving the contradiction between reliability and complexity.
2Reliability
If the connector and control interface are not perfectly connected or connection is loosen due to vibration, then the micro control unit can not receive the external input signal, but the system cannot detect this connection abnormality
Solution Approach 1:
The detecting unit provides continuous feedback monitoring of the input signal received by the micro control unit. When connection looseness or misconnection occurs, the detecting unit immediately detects the abnormal signal level (continuous high or low level) and triggers an alarm, making the connection status detectable and resolvable without increasing measurement difficulty.
3Loss of energy
If the micro control unit cannot stop the operation of the fan due to malfunction or connection issues, then extra power consumption occurs and fan damage may result, but the system lacks automatic shutdown capability
Solution Approach 1:
The detecting unit continuously monitors the input signal and provides feedback to the alarm device. When abnormal status is detected (signal always at high level or low level), the alarm is triggered and the controlling unit automatically stops the fan operation, reducing power consumption and preventing damage without requiring manual intervention.
Solution Approach 2:
The system performs self-diagnosis through the detecting unit that automatically monitors its own input signal status. When malfunction or connection issues are detected, the system automatically triggers the alarm and stops fan operation without external assistance, achieving self-service functionality that reduces energy loss.
Data Source
AI summary
An alarm device includes a first detecting unit and a controlling unit. The first detecting unit has an isolating circuit, a first enabling circuit, a second enabling circuit and an output circuit. The isolating circuit generates an adjusting signal according to an input signal. The first enabling circuit generates a first enabling signal according to the adjusting signal. The second enabling circuit generates a second enabling signal according to the first enabling signal. The output circuit outputs a first detecting signal according to the second enabling signal. The controlling unit outputs a control signal according to the first detecting signal. The control signal controls an electronic device to operate under a standby mode when the first detecting signal refers to an abnormal status.