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The protector circuit of the 555 multiple functional fridge

2016-09-20 12:58  
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The protector circuit of the 555 multiple functional fridge
See as Figure 13-10, the fridge protector is formed on the basis of time-base circuits, whose wiring is simple, size is small and functions are complete, and the circuit has functions of leakage protection, over voltage protection, low voltage protection and power failure time delay, etc. The value of low voltage protection is ≤170V; the value of over voltage protection is ≥250V; the auto time delay is about 5min; leakage reacting current is <0.8~2mA, the reacting time is< 0.1S; and the rated output power is 1000W. 555,R8,C13 and so on forms a single steady time delay circuit, the delaying time is td=1.1R8C13, which is about 5min.