Input protection circuit

Details Input protection circuit Input protection circuit

1982-06-03

1984-05-01

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

307200A, 364184, H02H 709

Patent

active

044464991

ABSTRACT:
A clamping transistor is connected to a signal input terminal of a signal processing circuit, such as a microprocessor, which operates on the output voltage from a stabilized power source circuit. When the output voltage from the stabilized power source circuit is below a predetermined value at the time of turning ON or OFF a power source switch, the clamping transistor is held in the ON state, thereby preventing the application of an input signal of a level higher than the power source voltage of the signal processing circuit, to the signal input terminal of the signal processing circuit.

REFERENCES:
patent: 4099068 (1978-07-01), Kobayashi et al.
patent: 4232236 (1980-11-01), Yomogida et al.
IBM Technical Disclosure Bulletin vol. 20, No. 3, Aug. 1977, "Anti-Disturb Power On/Off Circuit"--Gersbach.

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