JP2854496B2 - Overvoltage protection device for disaster prevention monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overvoltage protection device of a disaster prevention monitoring device for centrally monitoring terminal information such as a fire detector provided in a terminal with a receiver.

[0002]

2. Description of the Related Art Conventionally, in this kind of disaster prevention monitoring device, terminals such as a repeater and a fire detector are connected to a transmission line drawn from a transmission input / output unit in a receiver. Terminal information is collected by polling by specifying an address to monitor for abnormalities such as fires, and to control terminals for driving disaster prevention equipment that determines fire occurrence.

A transmission line is drawn from a transmission input / output unit in the receiver, and connects a repeater and a sensor. Further, the control CPU in the receiver monitors and controls the terminal via the transmission input / output unit.

[0004]

However, in such a conventional disaster prevention monitoring device, an AC power supply line (hereinafter referred to as an AC power supply) may be erroneously connected to a transmission line during construction. . That is, since the AC power supply and various signal lines for disaster prevention are arranged behind the ceiling or the wall surface, the AC power supply is erroneously connected to the transmission line for disaster prevention, and an accident occurs.

[0005] During construction, when an AC power supply is erroneously connected to the transmission line and the power supply is turned on, the AC power supply is applied to the receiver via the transmission line. There has been a problem that the circuit and the like are destroyed and suffers enormous damage. In addition, if the incorrect connection of the AC power supply is known, inspection and replacement of the damaged part can be performed relatively smoothly.However, if the receiver does not operate normally when the power is turned on, it may be due to the incorrect connection of the AC power supply. I do not know. For this reason, each circuit inside the receiver must be inspected, and terminals such as a repeater and a fire detector must be inspected. This has been a problem that the inspection is complicated and the repair is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and minimizes the damage caused when an AC power supply is erroneously connected, so that the cause of the abnormality can be easily grasped. Another object of the present invention is to provide an overvoltage protection device for a prevention monitoring device in which measures after an accident are extremely easy.

[0007]

FIG. 1 is a diagram illustrating the principle of the present invention. The present invention is directed to a disaster prevention monitoring device in which a terminal 11 is connected to a transmission line 12 drawn from a receiving unit 10 and detection information of each terminal 11 is monitored by the receiving unit 10. 34a and control CPU 3
2, photocouplers 72 and 74 for exchanging signals
Is provided.

In the present invention, the receiving means 10 is provided with a line abnormality detecting section 36a for detecting a line abnormality, and a photocoupler 76 for transmitting a line abnormality is provided between the line abnormality detecting section 36a and the control CPU 32. It is characterized by having.
Further, the present invention is characterized in that the receiving means 10 is provided with a notifying section 40 for notifying the line abnormality detected by the line abnormality detecting section 36a.

Further, the present invention relates to the transmission input / output unit 34a.
And the line abnormality detection unit 36a and the transmission input / output unit 34a
A photocoupler 72 provided between the
74, and a photocoupler 76 provided between the line abnormality detecting unit 36a and the control CPU 32 is formed on a detachable printed circuit board 78. In the present invention, the receiving means 10 is provided with a constant voltage circuit 68a for supplying a constant voltage for each of the transmission input / output sections 34a, and the constant voltage circuit 68a is formed on a detachable printed circuit board 70a. It is characterized by the following.

[0010]

According to the overvoltage protection device of the disaster prevention monitoring device of the present invention having such a configuration, signals are exchanged between the transmission input / output unit 34a provided in the receiving means 10 and the control CPU 32. Since the photocouplers 72 and 74 are provided, even if an AC power source is erroneously connected to the transmission line 12 to which the transmission input / output unit 34a is connected, damage to other circuit units of the receiver 10 can be minimized. it can.

The constant voltage circuit 68a is connected to the transmission input / output unit 3
4A, even if an AC power supply is erroneously connected to the transmission line 12, the entire system does not go down. Further, since the line abnormality is detected by the line abnormality detection circuit 36a, the cause of the abnormality can be easily grasped and reported. As a result, it is not necessary to check each circuit inside the receiver 10 and check the transmission line 12, the repeater, the terminal 11, and the like, and the time and effort are not required.

Further, when an AC power supply is erroneously connected to the transmission line 12 and a power supply voltage is applied, a printed circuit board 78 such as the transmission input / output unit 34a or a constant voltage circuit 68
Since the printed circuit board 70a may be replaced, measures after an accident and the like become extremely easy.

[0013]

FIG. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, reference numeral 10 denotes a receiver, which is a terminal on a transmission line 12 drawn out from the receiver 10 in this embodiment.
4. The analog smoke sensor 16, the analog heat sensor 18, and the control repeater 20 are connected. Repeater for sensor 1
4, a sensor line 22 is drawn out and connects the on / off sensor 24 and the transmitter 26.

When the on / off sensor 24 detects a fire,
The signal line of the sensor line 22 from the sensor repeater 14 is short-circuited to a low impedance, and the decrease in the line voltage is detected by the sensor repeater 14 to determine that a fire has occurred. The transmitter 26 is also operated by a push-button operation in the event of a fire.
2 is short-circuited to low impedance. The analog smoke detector 16 sends an analog detection signal corresponding to the smoke density obtained from the smoke detection unit to the receiver 10 and causes the receiver 10 to make a fire determination. Similarly, the analog heat detector 18 sends an analog heat detection signal from the heat sensing unit to the receiver 10 to determine a fire. The analog smoke sensor 16 and the analog heat sensor 18 are also provided with a function as an on / off sensor that transmits analog data and compares the analog data with a predetermined threshold in the sensor to determine a fire. .

A control line 28 is drawn out from the control repeater 20, and a control load 30 such as a district bell and disaster prevention equipment such as a fire door and a damper is connected to the control line 28. When receiving the control signal from the receiver 10, the control repeater 20 supplies a drive voltage to the control load 30 to operate the control load 30. The receiver 10 is provided with a control CPU 32, and the transmission path 12 is drawn out via transmission input / output units 34a and 34b in order to exchange signals with terminals.

An abnormality in the transmission line 12 is detected by a line abnormality detection unit 36.
And an abnormal signal is output to the control CPU 32. The detection of the abnormality is notified by the notification unit 40 of the display unit 38. An operation unit 42 and a power supply unit 44 are provided for the control CPU 32. The collection of terminal information and the control of the terminal by the control CPU 32 provided in the receiver 10 are basically performed by polling specifying a terminal address. For example,
Terminal addresses 1 to 127 are set. In the regular monitoring state, the terminal side is sequentially designated to call the terminal side, and the terminal information detected at that time is transmitted as response information.

In addition, since the terminal information can be detected at a plurality of terminals at substantially the same time, the control CPU 32 transmits a sampling command at regular intervals. Each terminal that has received the sampling command fetches the terminal information of the detector into the memory by AD conversion after the elapse of a unique waiting time determined by its own address. The terminal information held in the memory by the sampling command is transmitted as terminal information at the time of polling call specifying the next self address.

Next, FIG. 3 is a block diagram showing the configuration of the receiver 10. In FIG. 3, reference numeral 46 denotes an AC power supply,
The AC power supply 46 includes a plurality of DC power supply units 48a and 48.
b, 48c are connected to each other,
a, 48b and 48c convert a rated AC 100V input into a predetermined DC power supply. That is, the DC power supply unit 48a
Represents the converted DC voltage of the DCV 11 in the transmission input / output unit 34a.
And the DC power supply unit 48b supplies the converted DCV1
2 is supplied to the transmission input / output unit 34b, and the DC power supply unit 48c supplies the converted DCV2 DC voltage to the control CPU 32 and the other circuit 50, respectively.

From the transmitter confirmation terminal AA to the transmitter confirmation line 52
Are drawn out, the power supply line 54 is drawn out from the power supply terminal V, the signal line 56 is drawn out from the signal line terminal S, and the common line 58 is drawn out from the common terminal SC. The output units 34a and 34b are connected to each other, and the other end of the sensor repeater 1
4. Terminals such as an analog smoke sensor 16, an analog heat sensor 18, and a control repeater 20 are respectively connected. An abnormality in the transmission line 12 is detected by the line abnormality detection units 36a and 36b.

The transmission input / output units 34a and 34b and the control CPU 32 are formed on independent and detachable printed circuit boards, respectively, and are connected to each other via a connector connection line 60. Next, FIG. 4 is a block diagram illustrating the receiver 10 of FIG. 3 in more detail. In FIG.
A power switch 62 such as NFB is provided following the connection terminal of the AC power supply, and a transformer 64 for converting a rated AC 100 V input to a predetermined AC voltage is provided. The output voltage of the transformer 64 is controlled by a plurality of diode bridges 66.
a, 66b and output as a predetermined DC voltage. The output voltages of the diode bridges 66a and 66b are
A predetermined constant voltage is set by a plurality of constant voltage circuits 68a and 68b. The constant voltage circuit 68a outputs a predetermined DC voltage V11 to the transmission input / output unit 34a, and the constant voltage circuit 68b outputs a predetermined DC voltage V12 to the transmission input / output unit (not shown).

The constant voltage circuits 68a and 68b are formed on independent and detachable printed boards 70a and 70b, respectively. The constant voltage circuits 68a and 68b
When the AC power supply is erroneously connected to 4a, 34b and the AC power supply is destroyed, the printed circuit boards 70a, 70b may be replaced. Transmission input / output unit 34a and control CPU 3
2, a transmission photocoupler 72 is provided, and the transmission photocoupler 72 includes a light emitting diode 72a and a light receiving transistor 72b.

The control CPU 32 transmits various signals to the transmission input / output unit 34a via the transmission photocoupler 72. A receiving photocoupler 74 is provided between the transmission input / output unit 34a and the control CPU 32. The receiving photocoupler 74 includes a light emitting diode 74a and a light receiving transistor 74b.
Consisting of The control CPU 32 receives various signals from the transmission input / output unit 34a via the receiving photocoupler 74.

The line abnormality detecting section 36a and the control CP
A receiving photocoupler 76 is provided between U32, and the receiving photocoupler 76 includes a light emitting diode 76a and a light receiving transistor 76b. The line abnormality detecting unit 36a monitors the voltage of the transmission line 12, and when a voltage in a predetermined range is detected, the receiving photocoupler 76 is turned on,
A normal signal is sent to the control CPU 32.

Therefore, the transmission input / output unit 34a
When the V AC power supply is erroneously connected, the line abnormality detecting unit 36a detects the abnormality, and the photocoupler 76 is turned off. As a result, an abnormal signal is output to the control CPU 32, and the abnormality is notified by the notifying unit 40. Further, even if the light emitting diode 76a of the photocoupler 76 is destroyed by the overvoltage, the control CPU 32 can detect the abnormality. Furthermore,
Even if the transmission input / output unit 34a, the line abnormality detection unit 36a, and the photocouplers 72, 74, 76 are damaged, the transmission input / output unit 3
Since the 4a side and the control CPU 32 side are electrically isolated, there is no adverse effect on the control CPU 32, and damage can be minimized.

Transmission input / output unit 34a, line abnormality detection unit 36
a, the photocouplers 72, 74 and 76 are formed on an independent detachable printed circuit board 78. Therefore,
Even if an AC power supply is erroneously connected to the transmission line 12 drawn from the transmission input / output unit 34a and the transmission input / output unit 34a is destroyed, the printed circuit board 78 may be replaced, and measures after an accident can be easily taken. .

Also, when the constant voltage circuits 68a and 68b are damaged, the printed circuit boards 70a and 70b may be replaced. Next, FIG. 5 shows the transmission input / output unit 34a and the control CPU.
A specific configuration of a transmission photocoupler 72 provided between the transmission photocouplers 32 is shown. In FIG. 5, reference numerals 81a to 81f denote control Cs.
A connector provided on the PU 32, and a connector 81a
-81f, drivers 83a-8 via pull-up resistors R1a-R1f connected to a 5V power supply 82.
3f is connected. Drivers 83a to 83f have a predetermined hysteresis. Following the drivers 83a to 83f, the light emitting diodes 84a to 84f and the light receiving transistor 8
Photocouplers 86a to 86f including 5a to 85f are connected, and current limiting resistors R2a to R2f are connected to the light emitting diodes 84a to 84f. Arrows indicate outputs to the transmission input / output unit 34a.

The following signals are respectively input to the connectors 81a to 81f. That is, AO (-) is a transmitter lighting control signal, ST is a transmission signal to the repeater, SH is a sample and hold signal, SN is a response current check signal, SW is an address duplication check signal, SC
Indicates a signal line cut signal. These signals are output to the transmission input / output unit 34a.

FIG. 6 shows a specific configuration of the receiving photocoupler 74 provided between the transmission input / output unit 34a and the control CPU 32. In FIG. 6, the transmission input / output unit 34a
Are respectively connected to photocouplers 89a to 89e composed of light emitting diodes 87a to 87e and light receiving transistors 88a to 88e via current limiting resistors R3a to R3e and operation stabilizing resistors R4a to R4e, respectively.
The photocouplers 89a to 89e include capacitors C1a to C1e for absorbing noise and resistors R5a to R5 for pull-up.
Drivers 90a to 90e are connected via 5e, and connectors 91c to 91e of the control CPU 32 are connected to the drivers 90a to 90e.

A driver 90f is connected to the resistors R5a and R5b, and a photocoupler 89f including a pull-up resistor R5f, a light emitting diode 87f, and a light receiving transistor 88f is connected to the driver 90f. The photocoupler 89f has a resistor R3f and a zener diode Z.
A 48 V power supply 92 is connected via D. The photocoupler 89f monitors the voltage of the power supply 92 of 48V.

The following signals are output from the drivers 90a to 90e to the connectors 91a to 91e. That is, OT is an output trouble signal, SS is a signal line short signal, AT is a transmitter confirmation trouble signal, AI is a transmitter confirmation input signal, SR is a response signal from the repeater,
Each of these signals is shown and received by the control CPU 32.

Next, the operation will be described. Now, it is assumed that an AC power source is erroneously connected to the transmission line 12 to which the transmission input / output unit 34a is connected during construction. When the power is turned on, AC power is applied to the transmission input / output unit 34a and the line abnormality detection unit 36a, respectively.

The line abnormality detector 36a turns off the photocoupler 76 because it detects an abnormality in the transmission line 12. When the photocoupler 76 is turned off, the control CPU 32 determines that a line abnormality has occurred, and notifies the notification unit 40 of the line abnormality. Thus, the cause of the abnormality caused by the erroneous connection of the AC power supply can be easily grasped. Therefore, it is not necessary to check each circuit inside the receiver 10 and check the repeater, the terminal, and the like, and it does not require much labor and time.

On the other hand, when AC power is applied to the transmission input / output unit 34, the transmission input / output unit 34
a and the photocouplers 72 and 74 are destroyed, but since the transmission input / output unit 34a and the control CPU 32 are connected via the photocouplers 72 and 74, there is no adverse effect on the control CPU 32. Thus, damage can be minimized.

Further, since the constant voltage circuits 48a and 48b are provided for each of the transmission input / output units 34a and 34b, even if an abnormal voltage is applied via the transmission input / output units 34a and 34b,
The whole system does not go down. The transmission path 12
When the AC power supply is erroneously connected to the power supply and the transmission input / output unit 34a is
Since a and 70b may be replaced, countermeasures after an accident become extremely easy.

Although the above embodiment has been described by way of an example in which an AC power supply is erroneously connected, it is also effective when a transmission line using a high power supply of another system is connected.

[0036]

As described above, according to the present invention, the transmission input / output unit and the control CPU are connected by the photocoupler, and the line abnormality detecting unit is provided. Since the CPUs are connected by a photocoupler, even if AC power is accidentally connected to the transmission line, damage to other circuit parts in the receiver can be minimized, and the cause of the abnormality can be easily determined. Can be grasped,
Further, countermeasures after an accident can be easily performed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an overall configuration diagram according to an embodiment of the present invention.

FIG. 3 is an internal configuration diagram of a receiver.

FIG. 4 is a diagram showing an overvoltage protection device of the receiver.

FIG. 5 is a diagram showing a connection configuration on a transmission side.

FIG. 6 is a diagram showing a connection configuration on a receiving side;

[Explanation of symbols]

 10: Receiver (receiving means) 11: Terminal 12: Transmission line 14: Detector repeater 16: Analog smoke detector 18: Analog heat detector 20: Control repeater 22: Detector line 24: On / off detector 26 : Transmitter 28: Control line 30: Control load 32: Control CPU 34a, 34b: Transmission input / output unit 36a, 36b, 36: Line abnormality detection unit 38: Display unit 40: Notification unit 42: Operation unit 44: Power supply unit 46: AC power supply 48a, 48b, 48c: DC power supply unit 50: Other circuit 52: Transmitter confirmation line 54: Power supply line 56: Signal line 58: Common line 60: Connector connection line 62: Power switch 64: Transformer 66a, 66b : Diode bridge 68a, 68b: Constant voltage circuit 70a, 70b: Printed circuit board 72: Photocoupler 72a: Light emitting diode 72b: Receiver Optical transistor 74: Photocoupler 74a: Light emitting diode 74b: Light receiving transistor 76: Photocoupler 76a: Light emitting diode 76b: Light receiving transistor 78: Printed circuit board 81a to 81f: Connector 82: 5V power supply 83a to 83f: Driver 84a to 84f: Light emitting diode 85a To 85f: light receiving transistors 86a to 86f: photocouplers 87a to 87f: light emitting diodes 88a to 88f: light receiving transistors 89a to 89f: photocouplers 90a to 90f: drivers 91a to 91e: connectors 92: power supply of 48V

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-300398 (JP, A) JP-A-3-17899 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G08B 23/00-31/00

Claims (2)

(57) [Claims] 1. A disaster prevention monitoring device for connecting a terminal to a transmission line drawn from a receiving means and monitoring detection information of each terminal by the receiving means, comprising: a transmission input / output unit of the receiving means and a control CPU; To
A first photocoupler for exchanging signals is provided, and a line abnormality detection unit for detecting an abnormality in the line is provided in the receiving unit.
A line between the line abnormality detecting unit and the control CPU.
A second photocoupler for transmitting an abnormality is provided, the transmission input / output unit, the line abnormality detection unit, and the first photocoupler.
Print base with detachable photocoupler and second photocoupler
An overvoltage protection device for a disaster prevention monitoring device, which is configured on a board . 2. The overvoltage protection device for a disaster prevention monitoring device according to claim 1, wherein a constant voltage is supplied to said reception means for each of said transmission input / output units.
And a constant voltage circuit.
An overvoltage protection device for a disaster prevention monitoring device, characterized in that the roads are each configured on a detachable printed circuit board .