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555 household appliances protector circuit

2016-09-13 07:54  
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555 household appliances protector circuit
As the figure 15-6 shows, the household appliances protector is composed of the step-down rectifier circuit, the under-voltage over-voltage sampling circuit and the monostable delay circuit.etc. The IC1(555) is in the RS trigger mode, when it is under-voltage or over-voltage, IC1 is set, so pin-3 has the low electrical level, SCR cuts off, the load is out of power. When the power is coming, the terminal voltage of C4 can not be abrupt-change, and pin-2 has the high potential peak to make the IC2 to output the low electrical level, when the C4 is charged until pin-2's electrical level is lower than 1/3VDD, IC2 sets, the load restores the power supply.