Fan speed control principle circuit

Adjustable capacitor Murata genuine original

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The circuit is shown in Figure 1a. In the circuit, NE555 is connected to a square wave generator with adjustable duty cycle. Adjusting RW can change the duty cycle. During the high-level output of the NE555's 3-pin, the zero-crossing-off optocoupler MOC3061 initially obtains a forward operating current of approximately 10 mA, causing the internal gallium arsenide infrared emitting diode to emit infrared light, and the photo-sensing bidirectional switch in the zero-crossing detector When the utility power is zero, it is turned on, the electric motor of the electric fan is turned on, and the fan runs to supply air. During the low level output of pin 3 of NE555, the bidirectional switch is turned off and the fan stops.
The MOC3061 itself has a certain driving capability, and can directly control the operation of the electric fan motor by using the internal bidirectional switch of the MOC3061 without power driving components. RW is the duty-regulating potentiometer, that is, the adjustment of the air supply time per unit time (the circuit data is about 20 seconds). Changing the value of C2 or the value of RW can change the control period.
The circuit of Figure 1b is a typical power expansion circuit of MOC3061. When controlling a motor with high power, the power expansion circuit should be considered. When making, you can select the device by referring to the graphic parameters. Since the power supply adopts the capacitor voltage drop method, please be careful when making it yourself, and the human body cannot directly touch the circuit board.