AC FAN MOTOR DRIVING CIRCUIT HAVING CAPABILITY OF MONITORING THE ROTATION RATE AND STATUS OF THE AC FAN MOTOR

  • US 20080100239A1
  • Filed: 10/31/2006
  • Published: 05/01/2008
  • Est. Priority Date: 10/31/2006
  • Status: Active Grant
First Claim
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1. An AC fan motor driving circuit having capability of monitoring rotation rate and status of the AC fan motor driving circuit comprising:

  • a driving circuit module used to drive an AC fan and at least [what] comprising a driving IC that hastwo controlling outputs alternately outputting a trigger signal; and

    a rotation status detecting output, wherein the rotation status detecting output is unconnected when the AC fan motor is in a lock condition and connects to ground when the AC fan motor operates normally;

    a rotation rate detecting module comprisinga transistor connected to one of the two controlling outputs of the driving IC; and

    a photo coupler havingan input connected to the transistor; and

    at least one output outputting a rotation rate signal for computing the rotation rate of the AC fan motor; and

    a rotation status detecting module comprisinga photo coupler havingan input connected to the rotation status detecting output of the driving IC; and

    at least one output outputting a rotation status signal to determine whether the AC fan motor operates normally.

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