Patent ID: 7304470

Claim:
A fan operating status monitoring system, comprising: a detecting module, which is used for detecting pulsation currents generated from a rotation of a fan, and further converting the detected pulsation currents to pulsation voltage signals; a differential magnifying module, which is used for receiving said pulsation voltage signals, and further processing the received pulsation voltage signals by differential magnification and wave filtering so as to generate analog magnification signals; a first processing module, which is used for receiving said analog magnified signals, and further converting said analog magnified signals into pulse wave signals in order to measure a frequency of said pulse wave signals; a second processing module, which is used for receiving the pulsation currents detected by the detecting module, and further processing said pulsation currents so as to generate digital signals and then transmitting the digital signals; and a control module, which is used for receiving the digital signals transmitted from the second processing module and measuring a speed of the rotation of the fan based on the frequency of the pulse wave signals calculated by the first processing module, and further measuring the working currents of the fan based on the digital signals generated by the second processing module.