Building alarm system with synchronized strobes
First Claim
Patent Images
1. An alarm system comprising:
- a pair of power lines;
at least one audible alarm powered by said power lines, the audible alarm being controlled by a change in voltage on the power lines after the audible alarm has been powered; and
at least one visual strobe powered by said power lines, the strobe comprising;
a flash lamp;
a capacitor for carrying a charge to be discharged through the flash lamp; and
a charging circuit powered from the power lines to charge the capacitor to a firing voltage level that is maintained without activating the strobe, the strobe being triggered to flash with a change in the voltage on the power lines.
2 Assignments
0 Petitions
Accused Products
Abstract
In a building fire alarm system, the light strobes of a network of strobes are synchronized to flash simultaneously. Each strobe has a charging circuit to charge a capacitor which discharges through a flash tube. Once a capacitor is charged, the charging circuit is disabled. A synchronization pulse is applied through common power lines to trigger discharge of each strobe capacitor through the flash tube followed by recharging of the capacitor.
44 Citations
3 Claims
-
1. An alarm system comprising:
-
a pair of power lines;
at least one audible alarm powered by said power lines, the audible alarm being controlled by a change in voltage on the power lines after the audible alarm has been powered; and
at least one visual strobe powered by said power lines, the strobe comprising;
a flash lamp;
a capacitor for carrying a charge to be discharged through the flash lamp; and
a charging circuit powered from the power lines to charge the capacitor to a firing voltage level that is maintained without activating the strobe, the strobe being triggered to flash with a change in the voltage on the power lines. - View Dependent Claims (2, 3)
-
Specification