Power supply over voltage detection and time delay protection circuit diagram

Published:2011/5/16 3:19:00 Author:Rebekka | Keyword: over voltage detection , time delay protection | From:SeekIC

For some electrical equipments, the operating supply voltage range is strictly limited. Over-voltage or under-voltage will affect the work or even damage the equipment. The following shows a over-voltage and under voltage detection and time delay protection circuits. It can cut off the power supply when it is over-voltage or under-voltage. And it can start automatically after a period of delay. It is composed of two four-two input NAND gates CD4011. The over voltage and under-voltage detection circuit is composed of D1-D3 and RPl, RP2. D4 is trigger circuit. The relay driver circuit is composed of D7, D8 and transistor VT. The time relay restart circuit is composed of D5, D6 and R4, C5.



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