Kirton McConkie
System and method for controlling forward/reverse rotation of fan
A control system includes a motor, an interface circuit, a motor controller and a detection control circuit. The interface circuit receives and converts a pulse width modulation signal. The fan dissipates heat when the motor is operated in a forward rotation mode and eliminates dust when the motor is operated in a reverse rotation mode. The detection control circuit reads a duty cycle of the converted pulse width modulation signal in real time. When the motor is operated in the forward rotation mode, the detection control circuit drives the motor controller to control the rotation speed of the fan according to the duty cycle. If the duty cycle is lower than or equal to a first threshold value, the detection control circuit drives the motor controller to switch operation mode of the motor from the forward rotation mode to the reverse rotation mode.
DELTA ELECTRONICS, INC.
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F04D F04D F04D Y02B H02P
inventional inventional inventional additional inventional
Te-Sheng Cheng-Chieh Wen-Chih Chin-Ping
Su Liu Wang Su