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Cooling fan system alarm circuit

A technology of alarm circuit and heat dissipation fan, which is applied in the direction of electric transmission signal system, pump control, non-variable pump, etc., can solve the problem of single alarm device, etc., and achieve the advantages of simple circuit structure, improved reliability, cost and volume saving Effect

Inactive Publication Date: 2014-12-24
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Building and factory power supply and distribution equipment, long-running household appliances, etc. need to keep running for a long time, and have high requirements for cooling fan systems. Therefore, some alarm devices are often installed for cooling fan systems, but most of them are single-purpose Alarm devices, such as fan stop alarms

Method used

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  • Cooling fan system alarm circuit

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Effect test

Embodiment Construction

[0015] As shown in the attached figure, the fan stop signal (1) and the over-temperature alarm signal (2) are respectively filtered by the capacitor C1 and the capacitor C2, and then the diode D1 and the diode D2 are connected in series on each branch, and then combined into one and used as The input of the optocoupler U1; the main function of the diode D1 and the diode D2 is to prevent the circulation between the fan stop signal (1) and the over-temperature alarm signal (2). The fan stop signal (1) and the over-temperature alarm signal (2) are both at high level when fan stop and over-temperature occur, otherwise they are both at low level. Considering that the output of the original signal line such as the brushless DC motor fan is a square wave, the logic synthesis of the signal needs to be carried out before introducing this alarm circuit, that is, the low level is normal, and the high level is stopped; for the over-temperature signal, it is also The over-temperature alarm...

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Abstract

Disclosed is a cooling fan system alarm circuit. The cooling fan system alarm circuit is used for achieving alarming through an alarm lamp and an alarm sound when a fan stops rotating and relevant temperature is too high. The cooling fan system alarm circuit comprises an alarm signal isolation and amplification device, a dry reed relay and a sound-light alarm circuit. After being integrated into one path, a fan rotating-stop signal and an over-temperature alarm signal are isolated by an optocoupler and output, and then drive an NPN triode to be amplified, meanwhile, a coil of the dry reed relay is switched on to enable a normally open switch of the dry reed relay to be closed, then the sound-light alarm circuit is connected, so that a light emitting diode emits alarm light and a sound generator generates a sound after current flows through. According to the cooling fan system alarm circuit, the two kinds of alarm signals are integrated, dual alarming is carried out, the circuit is achieved through pure hardware, the structure is simple, and reliability is high.

Description

technical field [0001] The invention relates to the field of heat dissipation fans of electrical equipment, in particular to a dual alarm circuit system for fan stop and overtemperature in the heat dissipation environment. Background technique [0002] Building and factory power supply and distribution equipment, long-running household appliances, etc. need to keep running for a long time, and have high requirements for cooling fan systems. Therefore, some alarm devices are often installed for cooling fan systems, but most of them are single-purpose Alarm devices, such as fan stop alarms. [0003] With global warming, the ambient temperature becomes higher. In addition, in the hot summer, the heat dissipation system often fails due to the external temperature affecting the temperature of the fan itself or the temperature of the object to be radiated. Therefore, the temperature of the fan itself, or the heat dissipation The detection of object temperature or ambient temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B7/06F04D27/00
Inventor 孙冠群
Owner CHINA JILIANG UNIV
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