Power supply interruption detecting circuit

Details Power supply interruption detecting circuit Power supply interruption detecting circuit

1976-12-15

1978-07-04

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

361 86, 361 92, 361187, 340654, 340663, 363 53, 307318, H02M 118

Patent

active

040990680

ABSTRACT:
A power supply interruption detecting circuit which prevents an error in a write signal or sending and receiving signals of a data processing unit in the case of interruption of a commercial power supply or a power supply voltage drop resulting from an accident of other units connected to the same power supply. An abrupt drop of the power supply input voltage is detected by comparing the voltage of a CR circuit of a small time constant with the voltage of a CR circuit of a relatively large time constant. A slow input voltage drop is detected by comparing the voltage of the CR circuit of small time constant with a constant reference voltage. The power supply interruption is rapidly detected in substantially a constant short time regardless of input voltage variations and the write signal or the sending and receiving signals are each clamped at predetermined logic voltage, by which sending and writing of an error signal can be effectively prevented.

REFERENCES:
patent: 3243658 (1966-03-01), Blackburn
patent: 3351770 (1967-11-01), O'Sullivan et al.
patent: 3359457 (1967-12-01), King
patent: 3745375 (1973-07-01), Huruse

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