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555 fridge electricity saving protector circuit

2016-09-21 03:06  
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555 fridge electricity saving protector circuit
As the figure 13-4 shows, the electricity saving protector is composed of the voltage identification circuit, the astable oscillator circuit and the SCR control circuit, the step-down rectifier circuit. The voltage identification circuit is composed of the potential-divider network and the IC1.etc. The astable multivibrator is composed of the IC2 and R3, RP3, R4, C2, the oscillation frequency depends on the charge and discharge time constant. The working principle of the electricity saving is: when the voltage of city electricity is normal, the VT2 is in the open circuit state, so the oscillation frequency of the multivibrator IC2 can be adjusted by the potentiometer RP3. When the voltage of city electricity is lower than the refrigerator normal work voltage 175V, the circuit IC1 turns, pin-3 outputs the high electrical level to conduct the VT2.