JPH05207172A - Information transmission system - Google Patents

Abstract

PURPOSE:To transmit power source information and initialization signal, etc., from a power source device to respective information boards by supplying electric power to the plural information boards by means of the single power source device. CONSTITUTION:The power source device 7 executes change-over to a battery D when a commercial power source is interrupted by a power source monitoring circuit C. Information of the power source monitoring circuit C and a battery voltage monitoring circuit K are superimposed together with DC power so as to be transmitted to the information board by a power source line 6. Information signal is demodulated to a desired signal by a demodulating circuit I so as to be transmitted to a controller J. When power supply is interrupted, the controller J gives the display and alarm of power supply interruption and transmits meter examination data to a telephone line at the time of reduction of a battery voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmission system which is widely used in homes and the like and is used for security monitoring, security of meter reading data and the like and for telemetry.

[0002]

2. Description of the Related Art In an information transmission system for security monitoring, security of meter reading data, etc. and for telemetry, a commercial power source is used for each information panel of a terminal,
There are a system provided with a power supply monitoring device and a battery as a standby power supply, and a system supplying current from one power supply device to information boards of a plurality of terminals.

FIG. 3 is a block diagram of an example of the latter,
The management control device 1 is connected to a terminal network control device 3 via a telephone exchange 2, which is connected to a plurality of information boards 5, 5, 5 via a communication line 4. A sensor 8 for fire, intrusion, gas leak, etc., a meter 9 for gas, water, etc. are connected to each information board 5. In order to detect a power failure, a power source is monitored by using a sensor using a commercial power source, such as a gas alarm, as the sensor 8.

Each of the information boards 5, 5, 5 is connected to a common power supply device 7 via a power supply line 6, and required power is supplied from here. The power supply device 7 is connected to a commercial power source,
Add batteries in case of power failure.

[0005]

In any of the above-mentioned power supply devices having a battery for a power failure, it is necessary to connect a sensor using a commercial power supply to each information panel in order to detect a power failure. ..

If each information board has a power supply unit, a power supply monitoring unit, a battery, etc., there is a problem of cost increase.

In order to initialize each information board at the time of installation of the information board, malfunction, runaway, test, etc., it is necessary to initialize each information board.

Even if the power supply device has a battery as a backup power source to compensate for a power failure, if power is supplied from the battery for a long time during a power failure and the power supply is stopped due to the voltage drop of the battery, each information If the panel holds meter reading data, etc., the data may be lost.

[0009]

In the information transmission system of the present invention, power is supplied from a power supply device to a plurality of information boards via power supply lines, and each information board has a terminal network control device. Via a general public telephone line to the management control device, and the power supply device includes a power supply monitoring circuit for monitoring the power supply, a battery voltage monitoring circuit, and a reset circuit. The signal from is superimposed on the power supply current by the power supply line and given to each information board.

[0010]

Since the present invention has the above-described structure, the power supply monitoring circuit of the power supply device monitors the commercial power supply supplied to the power supply device, and when a power failure occurs, the battery in the power supply device is powered by the power supply circuit. Switch to, connect and use, and send power failure information to the information panel. When the information board receives the power failure information, it displays and gives an alarm in the information board, and transmits the information to the control device that manages and controls the information board.

In the battery voltage monitoring circuit, when the battery is used for a long time, the voltage of the battery drops, and when the voltage falls below the limit for transmitting information to the public line, the power supply is stopped, so that the power supply is stopped. A warning signal is sent from the power supply unit to the information panel before it is stopped. In response to the warning signal, the information panel causes the control device to transmit the meter-reading data when there is held data such as meter-reading.

By providing a reset circuit in the power supply device and operating the reset circuit, a reset signal is transmitted to the information board via the power supply line to simultaneously initialize each information board which is supplied with power from the power supply device. Can be done to.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of the essential parts of an embodiment of the present invention.

The power supply device 7 monitors the voltage of the rectification / constant voltage circuit A for converting the commercial power supply into a DC voltage, the power supply monitoring circuit C of the commercial power supply, the battery D for compensating for a power failure, and the battery D. Battery voltage monitoring circuit K, commercial power supply and battery D
Power supply circuit B, information board 5 for switching the power supply of
Has a reset switch G for initializing the power supply, and includes a power supply monitoring circuit C, a battery voltage monitoring circuit K, and a reset switch G.
A transmission circuit E for converting each of the above information into a signal and a modulation circuit F for superimposing the signal on a DC power supply are provided.

Information transmitted from the power supply device 7 as a signal superimposed on the DC power supply is transmitted to each information board 5 via the power supply line 6.

The information board 5 has a power supply circuit H for converting the DC power supply into a working voltage of the information board 5, and a demodulation circuit I for separating the signal from the DC power supply and taking out only the signal component. It is connected to the. One or more sensors 8 and one or more meters 9 are connected to the control device J, and the control device J performs predetermined processing on inputs and meter reading data from the sensors 8 and meters 9 and signals from the demodulation circuit I. Do.

In FIG. 2, the power supply device 7 is connected to the information board 5 and the power supply line 6 is provided.
It is a circuit diagram of an example connected by. The coils L1 and L2 on the output side of the power supply circuit B and the coils L3 and L4 on the input side of the power supply circuit H are signal blocking coils, and the transmission circuit E
The capacitors C1 and C2 connected to the transformer T1 between the power line 6 and the power source line 6 and the capacitors C3 and C4 connected to the transformer T2 between the demodulation circuit I and the power line 6 are DC power source blocking capacitors. The transformers T1 and T2 are tuning transformers and are connected to the transmission circuit E and the demodulation circuit I, respectively. The power supply device 7 is connected to the plurality of information boards 5.

[0018]

EFFECTS OF THE INVENTION By connecting a plurality of information boards to a single power supply and transmitting power supply information, initialization information, etc. by superimposing them on a DC power supply using a power supply line, initialization of a plurality of information boards is performed. In addition, the power supply for commercial power supply, batteries, etc. can be easily monitored.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a circuit diagram of an example of a connection between a power supply device and an information board 5.

FIG. 3 is a block diagram of an example of an information transmission system.

[Explanation of symbols]

 1 management control device 2 telephone exchange device 3 terminal network control device 5 information panel 7 power supply device 8 sensor 9 meter A rectification / constant voltage circuit B power supply circuit C power supply monitoring circuit D battery E transmission circuit F modulation circuit G reset switch H Power supply circuit I Demodulation circuit J Control device

Claims (2)

[Claims] 1. A plurality of information boards connected to a sensor, a meter, etc., and a terminal network control apparatus connected to a management control apparatus via a general public telephone line for transmitting and receiving information to and from the information boards. It consists of a power supply device that supplies power to multiple information boards via power lines.The power supply device has a power supply monitoring circuit that monitors the power supply, a battery voltage monitoring circuit for the battery that is the standby power supply, and the information board initialization. And a reset circuit for the power supply information signal and the reset signal from these circuits are superimposed on the power supply current by the power supply line and applied to each information board. 2. When the battery voltage drops to a certain value during a power outage, each information panel causes the management data to be transmitted to the management control device via the terminal network control device according to the information from the battery voltage monitoring circuit. The information transmission system according to claim 1, wherein: