Fan failure warning circuit

Abstract

The invention relates to a fan failure alarm circuit, which comprises a first integral circuit, a switching circuit, an input and output controller and an alarm, wherein, the first integral circuit receives rotating speed signals from a fan and outputs direct voltage signals on an output end of the first integral circuit; the switching circuit comprises a first transistor, a second transistor and a diode; a collector of the first transistor is respectively connected with a base of the second transistor and a first power source; a collector of the second transistor is also connected to the first power source; a base of the first transistor is connected to a cathode of the diode; an anode of the diode is connected to a second power source and taken as an input end of the switching circuit; the input end of the switching circuit is connected with the output end of the first integral circuit and receives the direct voltage signals which are outputted by the first integral circuit; the collector of the second transistor is taken as an output end of the switching circuit; when the fan runs normally, the output end of the switching circuit outputs a first signal; when the fan stops running, the output end of the switching circuit outputs a second signal and outputs an alarm signal through the input and output controller to drive the alarm to alarm.

Description

technical field [0001] The invention relates to a fan failure alarm circuit, in particular to a failure alarm circuit for a CPU fan on a computer motherboard Background technique [0002] With the rapid development of computer technology, the research and development technology and application fields of motherboards are becoming more and more extensive. How to make full use of the inherent characteristics of the main board, maximize the control advantages of the main board, and increase the added value of the main board has become the focus of attention of various main board manufacturers. In order to make full use of the overclocking performance of the motherboard and increase the running speed of the host, the user requires the central processing unit (CPU) to work at a faster speed than the conventional one, which will cause the CPU to consume more power and generate more heat. As a result, the temperature of the CPU is greatly increased, resulting in a shortened working...

AI Technical Summary

Problems solved by technology

The industry is now widely using fans to cool down the heat sink that is close to the surface of the CPU. However, when the fan fails, the user continues to run the computer system without noticing it, which will increase the temperature of the CPU, shorten the working life of the CPU, or even burn the CPU.

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