Circuit for protecting input of semiconductor device

Details Circuit for protecting input of semiconductor device Circuit for protecting input of semiconductor device

1989-06-13

1991-05-07

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361110, 3075421, H02H 104

Patent

active

050141554

ABSTRACT:
An input protection circuit for an electronic circuit includes a switching circuit operable between an ON state and an OFF state for generating an input for the electronic circuit, a first circuit responsive to an excess level of input for forming a clamping circuit across a first resistor for shunting an excess level input, a second circuit monitoring an input from the switching means for detecting a state of the switching circuit for producing an ON/OFF signal depending upon the detected state of the switching circuit, the second circuit including a second resistor which forms a series circuit with the first resistor and the switching circuits while the switching circuits is in an ON state. The switching circuits is operated to an ON position for establishing the series circuit for setting the level of the input at a minimum level and to an OFF position for opening the series circuit for setting the level of the input at a maximum level. The second circuit is set at a threshold level to be compared with the input level for detecting the state of the switching circuit, the threshold level being set at a level higher than the minimum level and lower than the maximum level so as to assure detection of the state of the switching circuits.

REFERENCES:
patent: 3967295 (1976-06-01), Stewart
patent: 4417155 (1983-11-01), Aizawa
patent: 4525635 (1985-06-01), Gillberg
patent: 4761566 (1985-08-01), Inoue et al.

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