555 fridge compressor work timer circuit

Published:2011/6/16 2:53:00 Author:TaoXi | Keyword: fridge, 555, compressor, work, timer | From:SeekIC

As the figure 13-13 shows, the displayer is composed of the step-down rectifier circuit, the boot delay and control circuit and the audio circuit.etc. The output voltage of the rectifier circuit is about 8V, at beginning, because the voltage of C3 can not be changed, so the electric potential of 555's pin-6 is higher than the trigger electrical level 2/3VDD to reset the circuit, the pin-3 outputs the low electrical level, the relay J will not work. The compressor gets power through the relay normally closed contact point J1-1 to work. When the fridge is broken, the compressor will not stop working, when the electric potential of pin-2 is lower than 1/3VDD, the circuit sets, pin-3 has the high electrical level, J releases, J1-1 cuts off, so the compressor has no power and stops working.



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