Input protection circuit

Details Input protection circuit Input protection circuit

2007-03-08

2009-06-02

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

C361S111000

Reexamination Certificate

active

07542255

ABSTRACT:
An input protection circuit comprises a reverse flow preventing diode, a series circuit of a diode and a Zener diode, and a current path forming resistor or diode. The reverse flow preventing diode is connected between an input terminal and an internal circuit. The series circuit is connected between the input terminal and a ground. The current path forming resistor or diode is connected between a first common connection point of the reverse flow preventing diode and the internal circuit and a second common connection point of the series circuit, and sets a potential at the first common connection point to be less than a potential at the input terminal when the surge voltage is applied to the input terminal.

REFERENCES:
patent: 6385021 (2002-05-01), Takeda et al.
patent: 2004/0021178 (2004-02-01), Larson
patent: A-5-160348 (1993-06-01), None

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