Fire alarm power line carrier com-system

• US 9,443,416 B2
• Filed: 09/26/2014
• Issued: 09/13/2016
• Est. Priority Date: 05/14/2010
• Status: Active Grant

• Current Assignee: Chris Kalivas
• Original Assignee: Chris Kalivas
• Inventors: Kalivas, Christopher George, Apelman, Steven Perry
• Primary Examiner(s): SHERWIN, RYAN W
• Application Number:
  US14/497,322
• Publication Number:
  US 20150130610A1
• Time in Patent Office: 718 Days
• US Class Current: 1/1
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion
• CPC Class Codes: G08B 17/06 Electric actuation of the alarm, e.g. using a thermally-operated switch
• CPC Class Codes: G08B 17/10 Actuation by presence of smoke or gases , e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
• CPC Class Codes: G08B 17/113 Constructional details
• CPC Class Codes: G08B 25/06 using power transmission lines

Abstract

A fire alarm system includes a transceiver. The transceiver has: a housing; conductors for receiving power from power lines; power output conductors for transmitting the power to a local alarm; and a connector for the alarm conductor of the local alarm. The transceiver has a trigger circuit, responsive to an alarm condition. A transmitter circuit responds to the alarm condition by injecting a signal onto a power conductor, using power line carrier technology. A receiver circuit responds to a second signal, similar to the first signal, by triggering the transmitter circuit; and by triggering the local alarm.

Claims

1. A fire alarm system, in a structure having a pair of commercial power source conductors, said structure not fully wired with a dedicated alarm conductor, said fire alarm system comprising:

an alarm;

said alarm having an alarm conductor;

an interface (4) between the alarm and said commercial power source conductors;

said interface having two power output conductors;

said interface installed by;

disconnecting the alarm from the two commercial power source conductors that supply the alarm'"'"'s power;

connecting the interface to the two commercial power source conductors;

connecting the alarm to the two power output conductors of the interface; and

connecting the alarm conductor of the alarm to an alarm wire (6CY) of the interface; and

a second interface, similarly installed between a second alarm and said commercial power source conductors;

each interface having;

a circuit (4J);

a pair of interface power input lines (6B, 6W), through which;

power, and

a radio signal, as an RF (radio frequency) alarm signal,

enter the circuit (4J);

a power line interface (20) through which the RF alarm signal goes;

a collision protector (40) through which the RF alarm signal is filtered, and

a receiver interface (42), to which, if said RF alarm signal passes the collision protection, said RF alarm signal is transmitted;

a band limited amplifier (44), which amplifies only a specific frequency used as an alarm frequency of the RF alarm signal;

a sharp band pass filter (46), to further screen and narrow the frequency;

a band limited amplifier (48) which amplifies said RF alarm signal,

a discriminator comparator (50), for input of the amplified said RF alarm signal, to ascertain that the input RF alarm signal is the specific frequency used as the alarm frequency;

a noise eliminating microcomputer (10), for;

processing the RF alarm signal from the discriminator comparator (50),

ignoring noise,

sending the RF alarm signal to an output drive (24),

passing the RF alarm signal to a drive enable (30);

the drive enable (30), which actuates a frequency stable oscillator (32) to output the RF alarm signal;

the output drive (24), for actuating a sound warning (26);

a power amplifier (34) for amplifying the RF alarm signal;

a band filter (36) to further narrow the RF alarm signal;

an impedance matching transformer (38); and

a power-line interface (20), where the RF alarm signal is injected into an interface power input line (6B, 6W).

2. A fire alarm system, according to claim 1, further comprising:

a third alarm interface, which might otherwise be out of range of a remote alarm interface which transmitted an original RF alarm signal to the circuit.