NE555 Overvoltage and Overcurrent Protection Circuit

Published:2011/6/23 10:10:00 Author:Michel | Keyword: Overvoltage, Overcurrent, Protection Circuit | From:SeekIC

The picture is the overvoltage and overcurrent protection circuit composed of NE555. VT1 and VT ends, NE555 resets, and all of the transistor is in conduction mode.It absorbs current from VT3 which makes VT stay in saturation condition and 5~12V DC power supply provides load via VT3.When load current exceeds rating value and voltage on RS increases which makes VT1 conduct and NE555 be triggered and then VT3 stops,load power supply cuts off.At the time,NE555 is in monostable condition and NE555 is triggered again VT3 continuely isolates load from power supply as long as the load flow does not rule out.



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