JPS6236280B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm device that issues an alarm by receiving signals from fire detectors or the like connected to a plurality of lines using a single receiver.

As shown in FIG. 1, a conventional alarm system using a P-type receiver has a configuration in which a signal line is required for each line. That is, as shown in the figure, when using 30 lines, for example, the signal lines L ₁ to L ₃₀ and the common line C are connected to the smoke detector 2, temperature sensor 3, and terminating resistor 4 arranged for each line. are doing. One common line C is used for every seven lines, and a total of five common lines are drawn out from the P-type receiver 1. In addition,
One confirmation line A, two indicator light lines PL, one telephone line T, and two bell lines B are required, and these are consistent from the first line to the final line. It is now wired as a line.

Conventional equipment with this type of configuration requires a signal line for each line, so as the number of lines increases, the number of signal lines also increases, and the connection of the main line in the joint box or general board becomes extremely difficult. There was a problem in that it became complicated and required a lot of time for installation work. By the way, when replacing sensor wires during renovation work, just installing 4 to 5 sensors will save 4
It takes up to 5 hours, and in the case of extension work, if there is a shortage of signal lines and common lines for the extension on the main line, a replacement line for the main line is required, resulting in an increase in the amount of work.

The drive was made in view of the above circumstances,
To provide an alarm device that does not require an increase in the number of trunk lines including signal lines even when the number of lines increases, and therefore can shorten installation work time and facilitate expansion and repair work. It is something.

The present invention will be specifically explained below using Examples.

FIG. 2 is a system diagram for explaining one embodiment of the apparatus of the present invention. In the figure, the same parts as those in the conventional device are designated by the same reference numerals. The difference between the device of the present invention and the conventional device is that an oscillation circuit 5 and an individual signal generator 6 are provided on the signal lines L ₁ to L ₃₀ of each line.
are connected to each other, and a discrimination circuit is provided in the receiver 1 accordingly. With this configuration, the number of signal lines and common lines included in the main line is reduced by one each.

FIG. 3 is a block diagram showing one embodiment of the circuit configuration of one line in the apparatus of the embodiment. In the figure, L and C are a terminal to which a signal line _L1 is connected and a terminal to which a common line _C1 is connected, respectively, and power supplies + and - are applied between these terminals L and C. Therefore the line wires connected to these terminals
_L1 and common line _C1 are used as signal lines and also as power lines. Between the signal line/power line _L1 and _C1, there is an oscillation circuit 5, a smoke detector 2 receiving the output of the oscillation circuit, and a temperature sensor receiving the output of the smoke detector 2 and the output of the oscillation circuit 5. Vessel 3
and a unique signal generator 6 which operates in response to the output of the temperature sensor, the output of the oscillation circuit 5, and the output of the smoke detector 2 are connected in sequence. That is, the oscillation circuit 5
A transmission line that connects the output to each input and output terminal.
The individual signal generator 6 is finally operated via _l1 to _l3 . In addition, the power supply and L, C
Filter 7A and detection coil L ₀ are connected between the terminals.
A discrimination circuit 7 having main parts thereof is connected. This discrimination circuit has a function of discriminating the unique frequency from the unique signal generator 6, and a function of determining whether the unique frequency is generated singly, continuously, or not. A signal V ₀ ( For example, digital signals of "1" and "0" are output. Here, for example, a piezoelectric tuning fork or a frequency discrimination circuit is used as a circuit having the function of discriminating frequencies as described above. Each of the detectors is fitted with a corresponding alarm indicator light 8A, 8B or an outdoor indicator light 8C to display the operating status of each sensor.

FIG. 4 shows an embodiment of the specific structure of each block after the L and C terminals in the block diagram. The oscillation circuit 5 includes a PUT (programmable unidirectional transistor), a charging/discharging circuit (resistance R ₁ , capacitor C ₁ ), and a voltage dividing resistor.
It is composed of R ₂ , R ₃ , switching transistor Q ₁ , bias resistor R ₄ and Zener diode Dz, and is repeatedly charged and discharged by switching PUT, and the divided voltage output at this time controls transistor Q ₁ . A pulse-like voltage _V1 can be obtained from the terminal P by turning it on and off. The smoke detector 2 includes an alarm detection circuit 2A consisting of a detection section 2a and an SCR, and a switching transistor _Q2.
and junction FET (field effect transistor) M ₁
and a transmission circuit 2B consisting of a bias resistor R ₅ and diodes D ₁ and D ₂ . Normally, since the transistor Q ₂ is conductive, the FETM ₁ is conductive, and the pulse of the oscillation circuit 5 is The voltage V ₁ is transmitted directly as the output V ₂ via the terminal S, but if a fire or the like occurs and the detection section 2a is activated, the SCR is activated and the transistors Q ₂ and
In order to make the FETM ₁ non-conductive, transmission of the pulse voltage V ₁ is blocked, and a power supply voltage is applied via the SCR and the diode D ₁ . The temperature sensor 3 includes an alarm detection circuit 3A having a temperature detection contact DS, and a switching transistor _Q3.
, FETM ₂ , bias resistor R ₆ and diode
It is constituted by a transmission circuit 3B consisting of D ₃ and D ₄ , and similarly to the smoke detector 2, it operates to output a pulse voltage or a power supply voltage. The individual signal generator 6 is controlled by the output signal based on the operation of each of the sensors 2 and 3 or the output of the oscillation circuit 5 obtained via the transmission circuits 2B and 3B, and generates a frequency ₀ unique to the line. The configuration is such that it outputs a signal V ₃ having the following characteristics. That is, when none of the sensors connected to the signal transmission path is in operation, a pulse voltage is applied via the transmission lines _l1 to _l3 . If any sensor is activated, the transmission of the pulse voltage is blocked and the power supply voltage is applied, so that _{the unique frequency signal 0 is} continuously output. If the state of the signal _V3 is determined by the discriminating circuit 7, it is possible to know which line's sensor is operating.

Next, the operation of the circuit will be explained with reference to timing charts.

FIG. 5 is a timing chart for explaining the operation when a fire alarm is issued. Oscillation circuit 5
A pulsed voltage V ₁ that arrives at regular intervals is outputted from the sensor, and this pulsed voltage V ₁ is applied to the individual signal generator 6 via the sensors 2 and 3.
A signal V ₃ with a unique frequency of ₀ is output from the unique signal generator 6 every time the pulse arrives (time t ₁ ,
_t2 ). In the event of a fire, the indicator light 8A or 8B attached to the sensor 2 or 3 lights up, and at the same time, the sensor operates to block the transmission of the pulsed voltage V ₁ and instead display a signal of "1". Since the power supply voltage V ₂ that maintains the level state is applied to the individual signal generator 6, the individual signal generator _{6 continuously outputs the signal V 3 of} the individual frequency 0. This state can be determined by the discriminating circuit 7 provided in the receiver 1, and a fire alarm can be notified by outputting a signal V ₀₁ that turns on the alarm indicator light of the corresponding line (time t ₃ ). After that, the state is held regardless of the state of the output _V1 of the oscillation circuit (after time _t4 ). In order to further ensure the discrimination in the discrimination circuit 7, a monostable multivibrator is provided on the output side of the individual signal generation circuit 6 to increase the width _T2.
It may be possible to create an output V ₃ having . This has the advantage that discrimination becomes easy when a tuning fork oscillator is used as the individual signal generator and a piezoelectric tuning fork for frequency discrimination is provided in the discrimination circuit 7. However, such measures are not necessarily necessary when a frequency discrimination circuit with good responsiveness is used.

FIG. 6 is a timing chart for explaining the operation when a disconnection occurs. When there is no disconnection, the pulse voltage V ₁ is applied to the individual signal generator 6 via the transmission lines l ₁ to _{l 3} , so that the pulse voltage V 1 is applied from the individual signal generator 6 to the arrival of the pulse voltage V ₁ . In synchronization, the output V ₃ of the unique frequency signal ₀ is output (time t ₁ ). Now, power supply and signal line L ₁ , C ₁ or transmission line l ₁ ~ _{l 3}
When the circuit is disconnected (time t ₂ ), the pulse voltage V ₁ is not transmitted to the individual signal generator 6, so the output V ₃ of the individual signal generator 6 remains at the "0" level. Then, in the receiver 1, the output V 3 of the individual signal generator ₆ at arrival time t ₃ of the first pulse voltage after the disconnection is “0”.
Detect the level and determine the arrival time t ₄ of the next pulse voltage V ₁
At this time, a disconnection detection output V ₀₂ is output to display a disconnection of the corresponding line. Then, when the pulse voltage V ₁ arrives after the time t ₅ when the disconnection is restored, the output V ₃ is generated from the individual signal generation circuit 6. This state is determined, and the disconnection detection signal V ₀₂ is returned to the original value. It will return to the "0" level (time t ₆ ). Of course, the individual signal generator 6
The disconnection detection output V ₀₂ may be generated when the output V ₃ of is not transmitted.

The above explanation of the operation is for one line, but since each line is provided with an oscillation circuit 5 and an individual signal generator 6 having a similar configuration, there is no chance of a fire or disconnection occurring in any line. Even if it occurs, it will be identified by the discrimination circuit and displayed by the receiver.

Note that the device of the present invention is not limited to the above embodiments,
Various aspects are possible. For example, smoke detector 2 is
As shown in Figure 7, the diode bridge (D ₅ ~
_D8 ) 2b, alarm detection circuit 2A, switching transistors _Q4 , _Q5 , resistors _R7 to _R9 , diodes
The transmission circuit 2B consisting of _D9 and the indicator light 8A may be configured, and the base of the transistor _Q4 may be connected to the P terminal, and the collector of the transistor _Q5 may be connected to the S terminal. Here, the diode bridge 2B is non-polar and is used for convenience in connection. In addition, the smoke detector 2
As shown in the figure, the buffer circuit 2D is composed of an alarm detection circuit 2A, a transmission circuit consisting of a digital buffer circuit 2D, and diodes _D11 and _D12 .
The input point may be connected to the P terminal, and the connection point of the diodes D ₁₁ and D ₁₂ may be connected to the S terminal. Furthermore,
In the above embodiment, the oscillation circuit 5 was provided for each line, but as shown in FIG. A pulse voltage may also be supplied. In this case, one trunk line will be added, but there is no need to provide an oscillation circuit for each line, so
Installation work becomes easier and configuration becomes simpler.

Although the above description has been made regarding a fire alarm device, it goes without saying that the present invention is not limited to this and can be applied to various alarm devices.

According to the embodiment device described in detail above, a unique signal generator is provided for each line, and is driven by the output of an oscillation circuit or the application of a power supply voltage, and the output of the unique signal generator is Since the sensor is determined by a discrimination circuit to detect sensor operation or disconnection, only one line line L and one common line C are required as signal lines, and both lines can also be used as power supply lines. Therefore, the number of trunk lines is extremely small compared to conventional equipment. By the way, as shown in Figure 2 above, the main lines are one confirmation line A and two confirmation lines.
Book indicator light line PL, one telephone line T, two bell lines B, one each line line L, common line C
8 lines in total, or even if you add one spare line L and one common line C for safety reasons, there will only be 10 lines, instead of 41 lines for 30 lines as in the past. The number will be much smaller than if it were. Therefore, connection and checking of the main line becomes easy, which reduces work time, and branching from the C and L terminals becomes extremely easy, thereby saving time and labor for repair work.

By the way, in the case of conventional alarm devices, the 10th
As shown in Figure a, each sensor 2, 3 is connected by a sending wire, and a minute current is passed through the terminal resistor R _T , and it is detected that the current stops flowing due to a break in the wire. As shown in FIG. 10b, even if the sensors 2 and 3 are not connected to each other by sending wires between the C and L terminals, for example, even if a disconnection occurs in the connection line _l4 , the signal will indicate a disconnection state. It is possible to immediately detect and display which individual signal generator system a disconnection has occurred. That is, the transmission circuit 2B or 3B of the sensors 2 and 3 described above operates to output a signal from the terminal P to the terminal S via an active element such as a transistor, and sends the signal to the individual signal generator 6. , if a disconnection occurs in the connection line _l4 that is not used as a feed wiring, this transmission circuit 2B or 3B will become inoperable,
Therefore, the individual signal generator 6 becomes inoperable, which makes it possible to detect a disconnection. Further, in the device of the present invention, even if one of the sensors is removed, the individual signal generator 6 becomes inoperative as described above, so the device has the advantage that the condition can be detected in advance. have

Furthermore, in the case of the conventional device, as shown in Fig. 11,
A relay circuit 10 consisting of a relay 9, a power supply E, a buzzer BZ, etc. is provided at the L and C terminals, and when the smoke detector 2 is activated, power is supplied through this relay circuit 10 to light up the indicator light 8. Therefore, it is designed to display which sensor is activated, and in this case, the sensors and indicator lights of a plurality of lines are connected in parallel to this relay circuit 10. The operation of the sensor on one line reduces the voltage applied to the sensor on the other line,
There is a problem that other sensors cannot be operated, and furthermore, if multiple sensors are activated simultaneously on the same line, the current supplied to the indicator lights attached to each sensor will decrease. Therefore, there was a problem in that it became dark and it became difficult to clearly distinguish. On the other hand, in the device of the present invention (the receiver side LC
Since the L and C terminals are used as power supply terminals and the power supply voltage is directly applied to the sensor and indicator light, the problems of the conventional method do not occur at all.

Further, the conventional device uses a sensor composed of a switching circuit 11, an oscillation circuit 12, and a detection circuit 13 as shown in FIG. 12a. That is, the switching circuit 11 is composed of an SCR, a switching transistor _Q6 , and resistors _R10 and _R11 , and the oscillation circuit 12 is composed of a PUT, a charging/discharging circuit (resistor _R12 , capacitor _C2 ), and a switch. The detection circuit ₁₃ is composed of a chamber CH, a diode _D10 , a voltage dividing resistor _R13 to _R16 , and a bias resistor _R17 .
Consists of FETM ₃ . Here, the oscillation circuit 12 is used to prevent malfunction of the sensor and to reduce current consumption.
Since such an oscillation circuit is added to each sensor, the circuit becomes complicated and the device becomes larger. However, in the device of the present invention, as shown in FIG. 5B, in place of the oscillation circuit 12, it is sufficient to provide a transmission circuit 14 consisting of switching transistors Q ₈ and Q ₉ and resistors R ₁₈ to R ₂₂ . That is, since each line is provided with an oscillation circuit, it is possible to supply pulse voltage, prevent malfunction, and reduce power consumption. In particular, if the configuration is such that the oscillation circuit is integrated into one and the pulse voltage is commonly applied to each line as shown in FIG. Simplification and miniaturization of the device can be achieved, and conventional problems can be solved.

According to the device of the present invention described in detail above, the number of trunk lines is small, and even if the number of lines increases, there is no need to increase the number of trunk lines, so the installation work time can be shortened, and expansion and repair work can be easily performed. In addition to monitoring disconnections, monitoring the sensor installation status, clearly lighting up the alarm indicator light when multiple sensors are activated, and simplifying the configuration by also using the oscillation circuit for pulse drive of the sensors. It is possible to provide an alarm device with great utility value.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional device, FIG. 2 is a system diagram of an embodiment of the device of the present invention, and FIG. 3 is a block diagram showing an example of the circuit configuration of one line in the system diagram.
FIG. 4 is a circuit diagram showing one embodiment of the specific configuration, FIGS. 5 and 6 are timing charts for explaining the operation of the circuit of the embodiment, and FIGS. 7 and 8 are
9 is a circuit diagram showing another embodiment of the sensor used in the embodiment, FIG. 9 is a block diagram showing a modification of the embodiment of the device of the present invention, and FIGS. 10 a and b
11 is a wiring diagram showing the wiring of the conventional circuit and the wiring of the circuit of the device of the present invention, FIG. 11 is a circuit diagram showing an example of the configuration of a relay circuit used in the conventional device, and FIG.
Figures a and b are circuit diagrams showing an example of the configuration of a conventional sensor and an example of the configuration of a sensor used in the device of the present invention. 1...Receiver, 2...Smoke detector, 3...Temperature sensor, 2A, 3A...Alarm detection circuit, 2B, 3B
...Transmission circuit, 4...Terminal resistor, 5...Oscillation circuit, 6...Individual signal generator, 7...Discrimination circuit,
8,8A~8C...Indicator light, 9...Relay, 10
... Relay circuit, 11 ... Switching circuit, 1
2...Oscillation circuit, 13...Detection circuit, 14...Transmission circuit.

Claims (1)

[Scope of Claims] 1. A power supply/signal line extending from the receiver and commonly used for a plurality of lines, and at least one power supply/signal line connected to the power supply/signal line and outputting a pulsed voltage.
an oscillation circuit, an alarm detection circuit that is connected to the power supply/signal line extending to each line and operates when a physical quantity exceeds a predetermined value, and a pulsed voltage of the alarm detection circuit output or the oscillation circuit that passes through and sends out. and a transmission circuit configured to allow each circuit to have a unique signal for each line in the power supply/signal line by being driven by the pulsed voltage output of the transmission circuit or the output of the alarm detection circuit. It identifies the individual signal generator that sends out the signal output and the individual signal of the individual signal generator provided for each line, and determines which driving signal the individual signal generator operates on. What is claimed is: 1. An alarm device comprising: a discrimination circuit that discriminates whether a vehicle is present and outputs a discrimination result signal. 2. The same number of oscillation circuits are provided corresponding to the individual signal generators provided for each line, and the pulsed voltage of the oscillation circuit or the output of the alarm detection circuit is applied to each individual signal generator via a transmission circuit. An alarm device according to claim 1, characterized in that the alarm device is configured as follows. 3. The alarm according to claim 1 or 2, wherein one of the oscillation circuits is provided near the receiver, and a pulsed voltage is supplied to each line via a transmission line. Device. 4. Claims 1 to 3, characterized in that the transmission circuit is connected by a transmission line, and the pulsed voltage of the oscillation circuit and the output of the alarm detection circuit are superimposed on the transmission line. Alarm device as described. 5. The transmission circuit is constituted by an active element that receives power supply from the power supply/signal line, and outputs the pulse voltage of the oscillation circuit and/or the output of the alarm detection circuit to the individual signal generator via the transmission line. An alarm device according to any one of claims 1 to 4, characterized in that: