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555 voltage double hresholds automatical protector circuit

2015-02-05 07:35  
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555 voltage double hresholds automatical protector circuit
The hypotension rectifier circuit provides IC and relay protection circuit with VDD=11V voltage source. 555 and sample network are connected into RS trigger work pattern. Because DW2 is connected, the 555 integrated chip internal comparator's reference voltage is clamped in V5=4V. The terigger terminal 2 foot is controlled by transfinite sample value, the reset terminal 4 foot is controlled by undervoltage sample value voltage. When 2 foot's sample value voltage is lower than 1/2 V5=2V, 4 foot's sample value voltage is higher than 0.7V reset voltage, 555 circuit sets, 3 foot is high level, relay J has no action, normally closed contact transport the voltage to load terminal, the power supply is normal, LED2(green)lights. When the voltage power is transfinite or undervoltage, 555 circuit is reset, 3 foot turns from high level to low level, J pulls in, the contact turns to emergency line, it has overvoltage and undervoltage protection for the load.