Patent ID: 7782216
Filing Date: 2010-08-24
Classification: G05B

Abstract:
1. A fan detecting apparatus for detecting operation of at least two fans in a computer room, comprising: at least two airflow detecting units each with a signal transmitting terminal configured for detecting status of a corresponding one of the at least two fans, the signal transmitting terminal of a corresponding airflow detecting unit outputting a control signal when airflow from the corresponding fan is no longer detected; a judging unit with at least one judging terminal configured for indicating which of the fans is no longer producing detectable airflow; and at least two identity indicating units electrically coupled to the signal transmitting terminals of the corresponding at least two airflow detecting units respectively, each of the identity indicating units having an identity code, corresponding identity code is transmitted to the judging terminal of the judging unit when either of the identity indicating units receives the control signal, wherein each of the identity indicating units comprises at least one mechanical switch, and at least one electronic switch coupled to the mechanical switch, the electronic switch comprises a control terminal, an input terminal, and an output terminal, the control terminal is coupled to the signal transmitting terminal of a corresponding airflow detecting unit, the input terminal is coupled to one terminal of the mechanical switch, and is coupled to a reference voltage via a resistor, the output terminal is coupled to the judging terminal of the judging unit, and is coupled to the reference voltage via another resistor, the other terminal of the mechanical switch is coupled to ground.