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555 refrigerator protection circuit 1

2015-02-05 12:42  
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555 refrigerator protection circuit 1
The circuit is shown in Figure 13-6, the circuit is based on 555circuit to form power delay protection circuit. The connection of C1 makes pin 6 be in high level, and pin 3 be in low level when the power failure and supply again, SCR is cut off. C1 charges, so the pin 2 is lower than the trigger time of 1/3 vdd, that is the delay time td. Icon corresponding td parameter is about 6 minutes. Setting to 55, pin 3 outputs high level. SCR turns on, the refrigerator gets power and the working indicator LED is lit.