Reset circuit

Details Reset circuit Reset circuit

1983-04-25

1985-05-28

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 88, 361 90, 307200B, 307200A, 340661, H02H 324

Patent

active

045204187

ABSTRACT:
A reset circuit which monitors the voltage of the power supplied to a microprocessor unit, and produces a low resistance to ground at the reset terminal of the microprocessor whenever the supply voltage changes from a low value to a high value, or from a high value to a low value. It is based upon the combination of two RC circuits of different time constants, such that when the supply voltage is constant, no current flows in these circuits. A transistor is connected to the RC network such that it carries current only when there is a changing voltage of the power supply. If the voltage increases or decreases, a second transistor acting as an electronic switch grounds the reset terminal, and when the voltage becomes constant again, either at a high value or a low value, the switch opens and the reset voltage goes high.

REFERENCES:
patent: 3703648 (1972-11-01), Wrabel
patent: 4103187 (1978-07-01), Imamura
patent: 4260907 (1981-04-01), Winebarger
patent: 4433390 (1984-02-01), Carp et al.

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