555 home appliance timing power-off controller circuit

Published:2011/6/7 0:56:00 Author:TaoXi | Keyword: 555, home appliance, timing, power-off, controller | From:SeekIC

As the figure 15-17 shows, the timing power-off control circuit is composed of the step-down rectifier circuit and the timing circuit.etc. When you press the button switch AN, the electric potential of 555's pin-2 is lower than the trigger electrical level 1/3VDD, so the 555 circuit turns, pin-3 outputs the high electrical level, the relay J closes and the J1-1 contact point closes too, the socket gets the power, the circuit starts timing at this time. The capacitance C is charged through R, when the voltage of C is higher than the threshold level 2/3VDD, 555 circuit resets, pin-3 has the low electrical level, J releases and J1-1 cuts off, the appliance has no power.



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