The 220V AC voltage is supplied with +12V DC voltage for the IC after C3 step-down, VD3 rectification, C1 filtering and VS regulation. After the ultra-low frequency oscillator is energized, an ultra-low frequency pulse signal with a frequency of about 1 Hz is output from the 3 pin of the IC. This pulse signal is applied to the control terminal (positive end) of the solid state relay KN, and controls the VTH by controlling the on and off of the KN (when the pulse signal is a positive pulse, KN is turned on; when the pulse signal is a negative pulse, KN is turned off) Conduction angle. Adjusting the resistance of the RP can change the duty cycle of the IC's 3-pin output pulse signal. The larger the duty ratio of the pulse signal, the longer the on-time of the VTH per unit time, the higher the operating voltage of the motor M, and the faster the operation speed. Motor speed control circuit:
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