Electric fan intermittent power socket circuit diagram

inductance

SMD aluminum electrolytic capacitor

Electric fan intermittent power supply socket circuit

The figure shows the electric fan intermittent power supply socket circuit. The socket circuit includes a buck rectifier, a multivibrator, and an opto-isolated thyristor control circuit. The time base circuit 555 and R2, RP2, RP2, D5, D6, C1 and the like constitute a multi-vibrator with adjustable duty ratio, and the oscillator period T and duty cycle times t1 and t2 are respectively: T=0.693 (R2) +RP1+R3+RP2)C1. T1=0.693 (RP1+R2)C1. T2=0.693 (R3+RP2) C1.
The longest period of the illustrated parameters is 300 seconds (5 minutes), and the positive and negative level times of the pulses are 150 seconds, respectively. Adjust the cycle length and duty cycle by adjusting RP1 and RP2. The LED's on and off respectively show on and off. SSR can adopt IC type solid state relay TAC018 (IA), which has the advantages of photoelectric isolation, safety and reliability.