A.C. powered detecting device with battery backup

Details A.C. powered detecting device with battery backup A.C. powered detecting device with battery backup

1977-01-03

1979-02-06

Yusko, Donald J.

Communications: electrical

Condition responsive indicating system

With particular system function

340509, 340629, 340636, 340693, G08B 1710

Patent

active

041386701

ABSTRACT:
An improved a.c. voltage powered warning device for detecting the occurrence of predetermined phenomena, is characterized by battery backup for providing power to the device in the event of interruption of the a.c. voltage. In the disclosed embodiments the warning device is a fire detector having circuitry for supervising the energy level of the backup battery and for providing a warning upon the energy level decreasing to a predetermined value, and for testing a combustion detecting and alarm generating portion of the detector.

REFERENCES:
patent: 3728706 (1973-04-01), Tipton et al.
patent: 3811123 (1974-05-01), Hamm et al.
patent: 3899732 (1975-08-01), Staby
patent: 3955186 (1976-05-01), Green et al.
patent: 3980997 (1976-09-01), Berns et al.

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