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Over voltage detection and protection circuit with delay

For some electrical equipment, operating supply voltage range is strictly limited, super-voltage or under voltage of the device will affect the work or even damage to the equipment, following a case of over-voltage detection and delay due to protection circuits, power supply voltage can be more or less than the specified scope of work when the power cut off, and start automatically after a period of time delay, circuit as shown. It consists of two four - two input NAND gate CD4011, composed of D1-D3 and RPl, RP2 been formed, under-voltage detection circuit, D4 to trigger circuit. D7, D8 and transistor relay driver circuit composed of VT. D5, D6 and R4, C5 components and then start the circuit delay.

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Over voltage detection and protection circuit with delay