JPS6351600B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a signal line drawn out from a receiver.
Connect a repeater so that multiple sensors that output at least three or more different signal voltages depending on the surrounding detection state can be connected to the repeater, and transmit the signal voltage from each sensor to the receiving side. The present invention relates to a signal transmission device configured as described above.

Conventionally, in this type of signal transmission device, for example, a gas leak alarm device, the gas sensor connected to the signal line drawn out from the receiver is powered by commercial AC 100V, and under normal conditions with no gas leakage, the gas sensor connects to the signal line led out from the receiver and has a voltage of 6 volts.
It is configured to produce different voltage outputs depending on the detection state, such as 12 volts when detecting a gas leak, and 0 volts when a failure occurs when the 100 VAC power supply is cut off and the sensor stops functioning.

Therefore, in order to centrally monitor multiple gas sensors using a receiver, it is necessary to pull out signal lines from the receiver for each detection state with different output voltages for gas leak, normal, and failure, which increases the number of signal lines. The number of detection states increases depending on the number of types of detection states, and as a result, in intensive monitoring of gas leaks in housing complexes such as condominiums, there has been a problem that the equipment configuration becomes complex and the cost tends to be high.

Therefore, the inventors of the present application have proposed a device in which a repeater is provided for each gas sensor, and a plurality of gas sensors can be connected to a pair of signal lines from a receiver via the repeater.

By the way, according to the above device, only two signal lines are needed from the receiver, which simplifies the equipment and reduces costs. Therefore, the number of repeaters increases in accordance with the number of gas sensors installed, which poses a problem in that the wiring of signal lines between each repeater tends to become complicated.

The present invention has been made with attention to such problems, and it is possible to apply at least three or more different signal voltages to a repeater connected to a pair of signal lines drawn out from a receiver, depending on the detection state. The purpose is to enable multiple output sensors to be connected, simplify the configuration of the device, and increase the efficiency of signal transmission.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a circuit block diagram showing an embodiment of the present invention using a gas leakage central monitoring device as an example.

First, to explain the configuration, a signal line _l1 and a common line _l2 are drawn out from the receiver 10, and the signal line _l1 ,
A repeater 12 is connected between the common wires _l2 . The repeater 12 includes gas sensors 14a, 14b, 14c.
are connected to terminals 2a, 2b, and 2c, respectively. These gas sensors 14a to 14c are commercially available.
Using AC100V as a power source, it outputs detection voltages e ₁ , e ₂ , and e ₃ that are 6 volts in normal conditions when there is no gas leak detection, 12 volts when gas leak is detected, and zero volts when the commercial AC 100 V is cut off. ing.

Next, to explain the configuration of the repeater 12, the repeater 1
2 is an input terminal 4 that inputs a signal voltage from the outside.
and an output terminal 6 for transmitting a signal voltage to the receiver 10. Gas sensor 14a-1
Each of the detection voltages e ₁ to _{e 3} from 4c is connected to an analog OR gate 16 consisting of diodes D ₁ , D ₂ , and D ₃ .
The voltage is taken out by the voltage detector 18, which determines and outputs a gas leak detection voltage of 12 volts.
The discrimination output of this voltage detector 18 is the switch circuit 2
0 is turned on, and the switch circuit 20
The signal voltage input via the analog OR gate 16 is sent to the output terminal 6 via the diode D ₄ (for backflow prevention). The circuit section consisting of the voltage detector 18 and the switch circuit 20 is
This constitutes the first switch circuit in the present invention.

Further, the input terminal 4 is input to a voltage detector 22 which discriminates and outputs a signal voltage of 12 volts, and a switch circuit 24 is turned on by the discrimination output of the voltage detector 22.
is connected between input terminal 4 and output terminal 6,
A circuit section consisting of this voltage detector 22 and switch circuit 24 constitutes a second switch circuit of the present invention.

On the other hand, each output of the gas sensors 14a to 14c is
Voltage detectors 26a, 2 that discriminate and output voltage signals from the gas sensor, that is, 6 volts during normal operation or 12 volts during gas leak detection.
Switch circuits 28a, 28b, and 28c are connected in series between the input terminal 4 and the output terminal 6, and are input to each of the voltage detectors 6b and 26c, and are turned on by the discrimination output of each of the voltage detectors 26a to 26c. These voltage detectors 26a to 26c and switch circuits 28a to 2
The circuit section 8c constitutes the third switch circuit in the present invention.

Next, to explain the configuration of the receiver 10, the receiver 1
0 includes a voltage detection circuit 30 that discriminates and outputs signal voltages received from the repeater 12 via the signal line _l1 , that is, 0, 6, and 12 volts, and a voltage detection circuit 30 that discriminates and outputs each of the signal voltages received from the repeater 12 via the signal line A display circuit 32 is provided to display each of gas sensor failure, normality, and gas leak, and a power supply circuit 34 is further provided for supplying power to the voltage detection circuit 30 and display circuit 32.

In the embodiment shown in FIG. 1, one repeater 12 is connected to the receiver, so the repeater 12 becomes the terminal repeater when viewed from the receiver 10, and therefore the input terminal of the repeater 12 4, the connection terminal 2a of the gas sensor 14a is connected to it via the termination diode _D0 .

FIG. 2 is a circuit block diagram showing an example of a specific circuit configuration of the repeater 12 in the embodiment of the present invention shown in FIG.

First, to explain the configuration, the first switch circuit consisting of a voltage detector 18 and a switch circuit 20 has a transistor _T8 whose emitter is connected to the output of the analog OR gate 16, and a zener voltage connected to the base of this transistor _T8. It consists of a Zener diode ZD ₂ with 8 volts and a resistor R ₈ .
In FIG. 1, the second switch circuit consisting of the voltage detector 22 and the switch circuit 24 includes a transistor _T1 whose emitter and collector are connected between the input terminal 4 and the output terminal 6, and the base of this transistor _T1. It consists of a Zener diode ZD ₁ with a Zener voltage of 8 volts connected to and a resistor R ₁ . Furthermore, in FIG. 1, voltage detectors 26a to 2
6c, the third switch circuit consisting of switch circuits 28a to 28c includes transistors T ₅ , T ₆ , T ₇ whose bases are connected to the respective outputs of the gas sensors 14 a to 14c via resistors R ₅ to R ₇ , and input terminals. 4 and output terminal 6, transistors T ₂ , T ₃ , T ₄ whose emitters and collectors are connected in series in sequence, and a transistor
Diodes D ₆ - _{D 8} connecting the respective bases of T ₂ - _{T 4} to the collectors of transistors T ₅ - _{T 7} , resistors R ₂ - _{R 4}
It consists of a circuit connected in series.

Furthermore, in the embodiment shown in FIG. 2, the collector side of the transistor _T8 is connected to the base of the transistor T9 via the diode _D10 and the resistor _R9 , and the collector of the transistor _T9 is provided with a relay coil 36, whose emitter is connected to the base of the transistor _T9 . Diode for backflow prevention on the side
A circuit with D ₁₁ is added. In this circuit section, in response to a signal voltage caused by turning on the transistor _T8 when any one of the gas sensors 14a to 14c outputs a gas leak detection voltage of 12 volts, the transistor _T9 turns on and energizes the relay coil 36. ,
By closing the relay contact 36a, an alarm indicator light, an alarm, etc. provided near the repeater is made to sound.

Next, the operation will be explained with reference to the second embodiment.

First, when the gas sensors 14a to 14c are in a normal state, each detection voltage e ₁ , e ₂ , e ₃ is 6
volts, a signal voltage of 6 volts is applied to each base of the transistors _T5 to _T7 , and the gas sensor 1
Since the detection voltage of 4a is also applied to input terminal 4 via the termination diode _D0 , the transistor
When _T5 to _T7 are turned on, the base currents of transistors _T2 to _T4 flow, turning on each of the transistors _T2 to _T4 , and the signal voltage applied to the input terminal 4 is sent to the output terminal 6, and the signal voltage is sent to the output terminal 6. It is determined by the voltage detection circuit 30 of the receiver 10 via the line _l1 , and the display circuit 3
2 shows the normal state.

Next, if gas leak detection is performed in one of the gas sensors 14a to 14c, for example, the gas sensor 14a, and the detected voltage _e1 becomes 12 volts, the emitter of the transistor _T8 is connected via the diode _D3 of the analog OR gate 16. Detection voltage 12
Volt is applied, the Zener diode ZD ₂ conducts, the transistor T ₈ is turned on, and a signal voltage of 12 volts is delivered to the output terminal 6 via the diode D ₄ .

On the other hand, input terminal 4 is connected via termination diode _D0 .
A detection voltage of 12 volts is applied to the output terminal 6, and this signal voltage also makes the Zener diode ZD ₁ of the transistor T ₁ conductive, turning on the transistor T ₁ and similarly transmitting the signal voltage of 12 volts of the input terminal 4 to the output terminal 6. Send. Therefore, the receiver 10 receives a signal voltage of 12 volts from the repeater 12 via the signal line _l1 ,
The voltage detection circuit 30 makes a determination and displays an alarm on the display circuit 32 indicating that a gas leak has been detected by one of the gas leak sensors.

Next, when the gas sensors 14a to 14c are in a normal state, for example, when the gas sensor 14b is in a
When AC100V is cut off, the detection voltage of gas sensor 14b
Assuming that a fault is detected such that e ₂ becomes zero volts, the transistor T ₆ that was previously on is turned off, and therefore the transistor T ₃ is also turned off, and the input terminal 4 is output via the transistors T ₂ to T ₄ .
The circuit that was sending the signal voltage _of
0, and an alarm is displayed on the display circuit 32 indicating that a failure has occurred in one of the gas sensors.

Next, if a gas leak is detected by the gas sensor 14c while the gas sensor 14b is in trouble, the transistor _T8 is turned on in the same manner as when the gas leak is detected by the gas sensor 14a.
A gas leak detection voltage of 12 volts is sent to the output terminal ₆ via the diode D4, and the receiver 10 receives this signal voltage of 12 volts and displays a gas leak alarm.

That is, in the embodiment shown in FIG. 2, signal voltages are sent out from the repeater 12 in accordance with the priorities of gas leak, failure, and normal.

In the embodiments shown in Figures 1 and 2, the number of gas sensors connected to the repeater is three, but the number of diodes and transistors T ₂ to T ₄ and T ₅ to _{T 7} that make up the analog OR gate are different. By increasing the number of switch circuits according to the number of connected sensors, any number of gas sensors can be connected to the repeater.

FIG. 3 shows another embodiment of the present invention,
This shows the case where multiple repeaters are connected to the receiver. In other words, the signal line drawn out from the receiver l ₁
is connected to the output terminal 6b of the relay 12B located at the previous stage, and the input terminal 4b of the relay 12B is connected to the output terminal _6a of the final relay 12A. It is designed to be connected to each of the devices 12A and 12B sequentially,
Regarding the final end repeater 12A, the output of the gas sensor 14a is connected to the input terminal 4a of the repeater 12A via the terminating diode D ₀ in the same way as shown in FIGS. 1 and 2.
I am trying to connect to. In addition, the repeater 12
The configuration of each of A and 12B is the same as that of the repeater shown in FIG.

Also in this embodiment, repeaters 12A, 12B
The detection voltages of the gas sensors 14a to 14c are 12 volts (gas leak) and zero volts (failure), respectively.
The signal voltage according to the priority order of normal (6 volts) is output to each of the output terminals 6a and 6b, and the priority relationship of this signal voltage is
The same holds true between A and 12B, for example, when the repeater 12B is outputting a normal signal voltage of 6 volts, a gas leak signal voltage of 12 volts, which has a higher priority than the repeater 12A, or a fault signal voltage of 0 volts is output. When input, this high priority signal voltage is sent to the receiver from the output terminal 6b of the repeater 12B.

Although the above embodiment has been explained using a gas leakage centralized monitoring device as an example, the present invention is not limited thereto, and can be applied as is to any appropriate signal transmission device having a sensor that outputs at least three different signal voltages. can do.

As explained above, according to the present invention, a repeater is connected to a signal line drawn out from a receiver,
Multiple sensors are connected to this repeater, and at least three different signal voltages, which differ depending on the detection state of each sensor, are transmitted to the receiver side according to a predetermined priority, so each repeater It is possible to connect multiple gas sensors, etc. to the same unit, simplifying the overall circuit configuration of the repeater itself compared to conventional devices in which one gas sensor was installed for each repeater, and Since the number of repeaters connected to the gas sensor can be sufficiently reduced compared to the number of gas sensors, wiring of signal lines between the repeaters becomes simple, and the cost can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a circuit block diagram showing a specific embodiment of the invention, and Fig. 3 is a circuit diagram of the present invention in which a plurality of repeaters are connected. FIG. 7 is a block diagram showing another embodiment. 10... Receiver, 12, 12A, 12B... Repeater, 14a, 14b, 14c... Gas sensor,
16...Analog or gate, 18, 22, 26
a~26c...Voltage detector, 20, 22, 28a
~28c...Switch circuit, 30...Voltage detection circuit, 32...Display circuit, 34...Power supply circuit, 4,
4a, 4b...input terminals, 6, 6a, 6b...output terminals.

Claims (1)

[Claims] 1. Signal transmission in which a repeater is connected to a signal line drawn out from a receiver, and three different signal voltages are transmitted to the receiver side according to the detection state of a sensor provided in the repeater. In the device, a plurality of the sensors are connected to the repeater, and the repeater has an input terminal for inputting the signal voltage from the sensor, an output terminal for outputting the signal voltage to the receiver side, and any one of the sensors. When determining the output first voltage signal, a first switch circuit that sends the voltage signal to the output terminal and a first voltage signal applied to the input terminal are determined. In some cases, a second switch circuit that sends the voltage signal to the output terminal; and a second switch circuit that outputs the voltage signal from all of the sensors and/or a second voltage signal different from the first voltage signal; A signal transmission device comprising: a third switch circuit that sends the signal voltage at the input terminal to the output terminal when a voltage signal is determined.