Surge protected smoke alarm

Details Surge protected smoke alarm Surge protected smoke alarm

1982-09-30

1985-04-16

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

250384, 333181, G08B 1710

Patent

active

045118892

ABSTRACT:
A smoke alarm for responding to alarm conditions using electrical circuitry having a horn coil placed in series with rectifier circuitry. The series connection of the horn coil with the rectifier circuitry enables suppression of line transients and also eliminates the need for additional transient suppression circuits. An alarm condition causes generation of a short circuit which activates the horn and causes current to pass through the horn; but the high impedance of the horn coil in the rectifier circuit limits the amount of current drawn to low levels for more efficient and safe operation of the smoke alarm. Further, the current flow in the horn will be substantially AC as a result of the series connection of the horn and rectifier circuitry, thereby eliminating the need for an alternate reset current path.

REFERENCES:
patent: 2066149 (1936-12-01), Hopkins

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