| 摘要 |
An alarm circuit includes a fan controller with a rotation speed control pin and a rotation speed detection pin, a first rectifying circuit connected to the rotation speed control pin, a switch circuit connected to the first rectifying circuit, a first indication circuit for indicating whether the fan fails to operate based on a switch signal from the switch circuit. The alarm circuit further includes a second rectifying circuit connected to the rotation speed detection pin, a comparison circuit for outputting a comparison signal after comparing a direct current signal from the second rectifying circuit with a first reference voltage and a second reference voltage, and an indication circuit for indicating whether the fan fails to operate based on the comparison signal.
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