Over-voltage protection circuit

Details Over-voltage protection circuit Over-voltage protection circuit

2007-09-25

2007-09-25

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

Reexamination Certificate

active

10401751

ABSTRACT:
An over-voltage protection circuit for protecting an integrated circuit includes an external power supply terminal to which a power supply voltage is supplied, a grounding terminal to which a ground voltage is supplied, and an internal power supply terminal for supplying the power supply voltage to the integrated circuit. A voltage dividing unit is connected between the external power supply terminal and the grounding terminal for dividing a voltage supplied from the external power supply terminal, and has a Zener diode and a first resistor connected in series. A signal generating unit is connected between the external power supply terminal and the grounding terminal for outputting the power supply voltage or the ground voltage, and a switching unit is connected between the internal power supply terminal and the signal generating unit for performing a switching operation.

REFERENCES:
patent: 3048718 (1962-08-01), Starzec et al.
patent: 5905621 (1999-05-01), Drapkin
patent: 6538866 (2003-03-01), Hanzawa et al.
patent: 06-245366 (1994-09-01), None
patent: 9-307361 (1997-11-01), None
patent: 10170581 (1998-06-01), None

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