JPH0512869Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an alarm indicator light circuit for a fire detector in which a remote lamp installed as an outdoor indicator light can be connected to a sensor base.

[Prior Art] Conventionally, as an alarm indicator light circuit for this type of fire detector, for example, the one shown in FIG. 3 is known.

In FIG. 3, 1 is a receiver, 2 is a fire detector, and the fire detector 2 includes a detector base 3 that is installed and fixed on a ceiling surface, etc., and a fire detection unit 5 that is detachably attached to the detector base 3. It consists of a sensor main body 4 equipped with.

The alarm indicator circuit is provided in the sensor base 3, and has a terminal 6a connected to the signal line from the receiver 1.
For example, an alarm lamp (alarm indicator light) 7 made of an LED is inserted and connected to the signal line from terminal 6a, which is the positive side of 6b, and a resistor R1 for current bypass is connected in parallel with the alarm lamp 7. A current limiting resistor R2 is connected in series. Here, the current bypass resistor R1 is provided to allow the monitoring current to flow during the steady monitoring state of the sensor, to prevent the alarm lamp 7 from lighting up due to rush current when the power is turned on, and to compensate for the voltage drop of the alarm lamp 7. ing.

Alarm lamp 7 in this alarm indicator circuit
The installation of fire detectors is required by law.

On the other hand, in the case of fire detectors installed in buildings such as hotels, a remote lamp (outdoor alarm indicator light) 8 is installed as necessary in order to make the alarm operation of the fire detector visible even from outside. may be installed.

For this reason, the sensor base is provided with terminals 9a and 9b for externally connecting the remote lamp 8, and the line of the positive terminal 6a connected to the receiver 1 is connected to the terminal 9a, and the terminal 9b is used to limit the current. It is connected to the line of the resistor R2 on the sensor main body side via the resistor R3 and the diode D1.

Therefore, when a fire is detected by the fire detecting section 5 of the sensor body, an alarm current flows in parallel to the alarm lamp 7 and the remote lamp 9, causing both to light up.

[Problems to be solved by the invention] However, in the case of conventional alarm display circuits that connect remote lamps, since the alarm lamp and remote lamp are connected in parallel, it is necessary to light both of them. In order to do this, it is necessary to flow an alarm current that is approximately twice the alarm current that would be generated when only the remote lamp is lit, and the power supply capacity of the receiver must be increased in conjunction with the connection of the remote lamp. There was a problem that it had to be done.

[Means for Solving the Problems] The present invention was developed in view of these conventional problems, and it is possible to light up the alarm lamp and remote lamp without increasing the power capacity of the receiver. The purpose of this invention is to provide an alarm indicator light circuit for a fire detector.

In order to achieve this purpose, in the present invention, a switching means is connected in series with a remote lamp externally connected to the connection terminal of the sensor base, and a switching means is connected in series with the remote lamp connected to the connection terminal of the sensor base, and switches in response to the fire detection output of the sensor main body. Furthermore, a Zener diode having a slightly higher Zener voltage due to the voltage drop of the remote lamp is connected in parallel with the remote lamp.

[Function] In the alarm indicator lamp circuit of the present invention having such a configuration, since the alarm lamp and the remote lamp are connected in series to the switching means, only the alarm lamp is connected even if the remote lamp is connected. Both can be lit with the same alarm current as in the case of , and there is no need to increase the power supply capacity of the receiver.

Furthermore, since a Zener diode is connected between the connection terminals of the remote lamp, the alarm lamp can be turned on normally even if the remote lamp is not connected or the signal line of the remote lamp is disconnected.

[Embodiment] FIG. 1 is a circuit diagram showing an embodiment of the present invention.

In FIG. 1, 1 is a receiver, 2 is a fire detector, and the fire detector 2 has a terminal 14 connected to a sensor base 3 installed and fixed on the ceiling.
It consists of a sensor main body 4 that can be attached and detached by means of a and 14b, and a fire detection section 5 is provided in the sensor main body 4, and the fire detection section 5 includes a photoelectric smoke detection mechanism,
Any suitable fire detector mechanism may be used, such as an ionization smoke detection mechanism or a thermal smoke detection mechanism.

The sensor base 3 is connected to the receiver 1 by signal lines through terminals 6a and 6b, and receives power supply with the terminal 6a side set as (+). The sensor base 3 is provided with an alarm indicator circuit according to the present invention.

That is, a remote lamp 8 provided as an outdoor alarm indicator light is connected by a signal line between terminals 9a and 9b provided on the sensor base 3, and these terminals 9a,
An alarm lamp 7 as an alarm indicator lamp and a transistor Q1 as switching means are connected in series to a remote lamp 8 connected to terminal 9b. Specifically, the alarm lamp 7 is connected in series to the remote lamp 8, and the transistor Q1 is further connected in series via a current limiting resistor R10. The detection output of the fire detection section 5 provided in the sensor body 4 is connected to the base of the transistor Q1 via a resistor R13, and when the detection output of the fire detection section 5 is received, it receives a base bias from the resistor R13 and the resistor R11. Transistor Q1 turns on. Furthermore, a Zener diode ZD is connected in parallel to the remote lamp 8 connected to the signal line between terminals 9a and 9b.
are connected. Here the Zener diode ZD
The Zener voltage Vz used here has a Zener voltage slightly larger than the voltage drop when the alarm current is passed through the remote lamp 8. For example, since the voltage drop of the remote lamp 8 using an LED is usually 2V or less, a Zener diode ZD with a Zener voltage Vz=2.5V is used, for example.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

When the fire detection section 5 provided in the sensor body 4 detects a fire and outputs a detection signal, a base current flows through the transistor Q1 provided in the sensor base 3, turning on the transistor Q1. When the transistor Q1 is turned on, a drive current flows through the resistor R10 to the remote lamp 8 and the alarm lamp 7, and both are turned on. At this time, since the Zener diode ZD has a Zener voltage Vz that is slightly larger than the voltage drop of the remote lamp 8, it is placed in a non-conductive state.

Here, the voltage applied to the base of transistor Q1 is
Vs, and if the voltage drops of remote lamp 8 using LED and alarm lamp 7 are Vr and Va, respectively, the current I flowing through both is I=(Vs-Vr-Va)/R10...(1) (However, Vs is the same as the power line voltage when the fire detection unit 5 is activated).

Next, if the signal wire of the remote lamp 8 connected to the terminals 9a and 9b is disconnected, the fire detection section 5
When the transistor Q1 turns on in response to the output, the Zener diode ZD connected in parallel to the disconnected remote lamp 8 becomes conductive, allowing current to flow through the alarm lamp 7 and lighting it up normally. The current I flowing through the alarm lamp 7 when the signal line of the remote lamp 8 is disconnected is as follows: I=(Vs-Vz-Va)/R10 (2). Here, Vr in the above formula (1) is usually 2V or less, whereas the Zener voltage Vz is, for example, Vz=2.5V, so the remote lamp 8
Even when the alarm lamp 7 is disconnected, the current flowing through the alarm lamp 7 is maintained at approximately the same current value as during normal operation.

FIG. 2 is a circuit diagram showing another embodiment of the present invention. In this embodiment, the fire detection signal is transmitted to the receiver along with the detector address based on the sensor, and then the fire detection signal is transmitted from the receiver to the receiver. The present invention is characterized in that it includes an address transmission unit that receives a confirmation signal.

In FIG. 2, the sensor base 3 of the fire detector 2 has terminals 9a and 9b, similar to the embodiment shown in FIG.
It has a remote lamp 8 connected therebetween, an alarm lamp 7 connected in series to the remote lamp 8, and a transistor Q1 as a switching means,
A Tsunae diode ZD having a Tsunae voltage Vz slightly larger than the voltage drop of the alarm lamp 8 is connected in parallel.

Furthermore, the sensor base 3 includes a current detection circuit 10 that detects the alarm current that flows when a fire is detected in the fire detection section 15 of the sensor main body 4, and a current detection circuit 10 that detects the alarm current that flows when a fire is detected by the fire detection section 15 of the sensor main body 4; On the other hand, a transmission circuit 12 is provided for transmitting the fire detection signal and the setting address set by the address setting device 11, and further,
After transmitting the fire signal and the sensor address to the receiver 1, the transmission circuit 12 receives and decodes the confirmation signal sent back from the receiver 1, and transmits it to the transistor Q1.
It has a function of generating confirmation output Vo on the base of.

Note that the transistor Q1 has a current limiting resistor R12 connected to its emitter side.

Even in the embodiment shown in FIG. 2, when a fire is detected by the fire detection section 5 of the sensor body 4, the sensor base 3 is provided with an alarm current that flows due to the activation of the fire detection section 5. The current detection circuit 10 detects the current and generates a detection output in the transmission circuit 12, and the transmission circuit 12 sends a fire detection signal to the receiver 1 and an address setting device 1.
1 transmits the sensor address. Receiver 1 receives the fire detection signal and detector address from fire detector 2, performs fire reception processing, and then sends out a confirmation signal specifying the address of fire detector 2 that triggered the alarm. The signal is identified by transmission circuit 12 and produces a verification output Vo at the base of transistor Q1. When the transistor Q1 is turned on in response to the confirmation output Vo from the transmission circuit 12, a current flows through the remote lamp 8 and the alarm lamp 7, causing both to light up.

Here, if the voltage drop between the base and emitter of the transistor Q1 turned on in response to the output voltage Vo of the transmission circuit 12 is Vbe, the current I flowing through the remote lamp 8 and the alarm lamp 7 is I=(Vo-Vbe)/R12... (3) becomes. Of course, if the signal line of the remote lamp 8 is disconnected, the transistor Q1 is turned on and the Tuna-E diode ZD is made conductive to normally light the alarm lamp 7, and the signal line of the current alarm lamp 8 at this time The current is approximately the same as the normal value without any disconnection.

In the embodiment shown in FIG. 2, the transmission circuit 12
Although the remote lamp 8 and the alarm lamp 7 are turned on by the confirmation output Vo of Remote lamp 8 and alarm lamp 7
The light may be turned on.

[Effects of the invention] As explained above, according to the invention, a switching device is connected in series with the remote lamp externally connected to the connection terminal of the sensor base, and performs switching in response to the fire detection output of the alarm lamp and the sensor body. In addition, a Zener diode with a Zener voltage slightly higher than the voltage drop of the remote lamp is connected in parallel with the remote lamp, so even if the remote lamp is connected externally, only the alarm lamp is lit. The remote lamp and alarm lamp can be lit with approximately the same current value as the current when the remote lamp is connected externally, and there is no need to increase the power supply capacity of the receiver even if the remote lamp is connected externally.

Further, even if the signal line of the remote lamp is disconnected, the alarm lamp can be normally lit without being affected by the disconnection of the remote lamp 8 connected in series due to the conduction of the Zener diode connected in parallel to the remote lamp.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one embodiment of the invention, Fig. 2 is a circuit diagram showing another embodiment of the invention, and Fig. 3 is a circuit diagram showing another embodiment of the invention.
The figure is a circuit diagram showing a conventional example. 1... Receiver, 2... Fire detector, 3... Sensor base, 4... Sensor body, 5... Fire detection section, 6a, 6b, 9a, 9b, 14a, 14b...
...Terminal, 7...Alarm lamp (alarm indicator light),
8...Remote lamp (outdoor alarm indicator light), 10
...Current detection circuit, 11 ...Address setter, 1
2...Transmission circuit, Q1...Transistor (switching means), ZD...Zener diode.

Claims (1)

[Scope of Claim for Utility Model Registration] In a fire detector consisting of a detector base installed and fixed on a ceiling surface, etc., and a detector main body detachably attached to the detector base, the detector base has: A connection terminal for a remote lamp installed externally is provided, and an alarm lamp and switching means for switching in response to the fire detection output of the sensor body are provided in series with the remote lamp connected to the connection terminal in the sensor base. and further connected in parallel with the remote lamp a Zener diode having a Zener voltage slightly higher than the voltage drop of the remote lamp.