Power-off detection circuit for an electronic apparatus

Electrical transmission or interconnection systems – Switching systems – Condition responsive

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361 92, G01R 1702

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active

046187804

ABSTRACT:
An electronic apparatus including a circuit generating a control signal activating at least one heavy load includes a voltage comparision circuit for comparing a power source proportional voltage with a reference voltage and outputting a power-off signal when the level of the power source proportional voltage is smaller than that of the reference voltage, and a power-off detection circuit responsive to the power-off signal of the comparision circuit for detecting the level of the control signal associated with the at least one heavy load and detecting a power-off condition of the electronic apparatus.

REFERENCES:
patent: 3648145 (1972-03-01), Meyer et al.
patent: 4172980 (1979-10-01), Hsieh et al.
patent: 4203059 (1980-05-01), Kraus
patent: 4415943 (1983-11-01), Wortman
patent: 4429236 (1984-01-01), Nitschke
patent: 4439805 (1984-03-01), Tarleton
Dye, "Electronic Power Control Interface", IBM Technical Disclosure Bulletin, vol. 21, No. 5, Oct. 1978, pp. 2062, 2063.

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