Battery test system, as for smoke detector alarm

Details Battery test system, as for smoke detector alarm Battery test system, as for smoke detector alarm

1979-12-26

1981-02-17

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

320 48, 324435, 340628, G08B 2100, G08B 1710

Patent

active

042518113

ABSTRACT:
A system for use in battery powered alarm equipment for self-testing such battery for a low voltage and a high series resistance condition, and particularly for use in systems which utilize a starting capacitor in combination with the battery to provide a high starting current to the alarm annunciator. For periodic battery tests, a resistor is selectively connected across the battery and the resulting voltage drop at the battery terminals is compared to a reference voltage supply. Energy stored in the starting capacitor is prevented from discharging through the battery test circuit by a transistor switch operated in the inverse mode for disconnecting the starting capacitor from one of the battery terminals during such battery tests so that substantially no current is supplied from the starting capacitor through the test circuit. When the alarm is activated, the transistor switch is operated in the normal mode to connect the starting capacitor in parallel with the battery to provide starting current for the alarm. When the alarm annunciator is not activated, the starting capacitor is maintained at substantially full battery voltage.

REFERENCES:
patent: 3680072 (1972-07-01), Charbonnier et al.
patent: 4024523 (1977-05-01), Arnold et al.
patent: 4083037 (1978-04-01), Larsen
patent: 4126874 (1978-11-01), Suzuki et al.
patent: 4138664 (1979-02-01), Conforti et al.
patent: 4138670 (1979-02-01), Schneider et al.
patent: 4149162 (1979-04-01), Enemark et al.
patent: 4160246 (1979-07-01), Martin et al.
patent: 4186390 (1980-01-01), Enemark
patent: 4198627 (1980-04-01), Kakigi
Battery-Operated Smoke Detectors, The Need for Effective Battery Supervision by Raber et al., Fire Journal, Sep. 1978, pp. 104-108.

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