Patent ID: 7661305

Claim:
An airflow detection apparatus configured to detect airflow of a fan, the airflow detection apparatus comprising: a first transistor located adjacent an air outlet of the fan, the base and the collector of the first transistor connected to a power supply to receive power; a stabilizing circuit connected to the emitter of the first transistor to supply the first transistor a stable current; an amplifier, an input end of the amplifier connected to the emitter of the first transistor to receive a voltage signal from between the base and the emitter of the first transistor, the voltage signal variable with changes in the temperature of the first transistor, an output end of the amplifier outputting an amplified voltage signal; an A/D converter, an input end of the A/D converter connected to the output end of the amplifier to receive the amplified voltage signal, and converting the amplified voltage signal to a digital signal; a microprocessor connected to an output end of the A/D converter to receive and process the digital signal to an indicating signal; and an indicating circuit connected to the microprocessor to receive the indicating signal, and show airflow status of the fan according to the indicating signal.