| 摘要 |
A driving circuit has a driving circuit module, a rotation rate detecting module and a rotation status detecting module. The driving circuit module is used to drive an AC fan motor and has at least a driving IC having two controlling outputs and a rotation status detecting output. The rotation rate detecting module has a transistor and an photo coupler. The transistor is connected to one of the two controlling outputs of the driving IC. The photo coupler is connected to the transistor and outputs a rotation rate signal to compute the rotation rate of the AC fan motor. The rotation status detecting module has an photo coupler connected to the rotation status detecting output of the driving IC and outputting a rotation status signal to determine whether the AC fan motor operates normally.
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