Over voltage and surge voltage preventing circuit

Details Over voltage and surge voltage preventing circuit Over voltage and surge voltage preventing circuit

2006-02-21

2006-02-21

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

Reexamination Certificate

active

07002783

ABSTRACT:
An over voltage and surge voltage preventing circuit for a display module includes resistors that divide an input voltage. A first switching device is turned on when a voltage-divided value made by the resistors is larger than a reference voltage. A second switching device is connected to an output terminal of the first switching device to carry out a switching operation contrary to the first switching device. A third switching device has a control terminal connected to an output terminal of the second switching device to carry out the same switching operation as the second switching device, thereby shutting off said over voltage to output only a normal input voltage. A time constant circuit delays an input voltage supplied from a turn-on time of the power supply by a predetermined time constant to prevent a generation of surge voltage.

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M. Mano, Digital Design, 1984, Prentice-Hall, Inc., pp. 65-66.

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