| 摘要 |
<p>A fan control method, device and system, which are used for achieving by a PWM control bus the speed adjustment and steering control of a counter-rotating fan of a four-wire specification interfaced with a conventional four-wire fan. The fan control method comprises: receiving a first fan adjustment and control signal sent by a system control module, according to the duty ratio interval of the first fan adjustment and control signal and the current rotation direction of the fan, converting the first fan adjustment and control signal into a forward rotation direction control signal, a backward rotation direction control signal or a switching rotation direction control signal, and sending the converted control signal to a fan drive module, so as to enable the fan drive module to drive the fan according to the converted control signal.</p> |
