Battery discriminator circuit for smoke detectors

Details Battery discriminator circuit for smoke detectors Battery discriminator circuit for smoke detectors

1977-06-20

1979-04-10

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340630, 250574, G08B 2100, G08B 1710

Patent

active

041491629

ABSTRACT:
A battery powered smoke detector includes a battery powered discriminator circuit which periodically senses the chemistry of the battery represented by its volt-ampere output and internal impedance. An external impedance comparable to the alarm circuit load on the battery is connected in parallel with the battery such as to trigger an alarm when the battery energy delivered through the impedance approaches a level inadequate to drive the alarm.

REFERENCES:
patent: 3500167 (1970-03-01), Applegate et al.
patent: 3846773 (1974-11-01), Lintelmann et al.
patent: 3899732 (1975-08-01), Staby

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