JPH0691713B2 - Remote monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention switches a power source from a commercial power source to a secondary battery and operates when a power failure occurs, and monitors a plurality of terminal devices for monitoring and controlling facility equipment via a communication line. The present invention relates to a remote monitoring device for remote monitoring at a station.

<Prior art> Equipment installed in a building and a terminal device for monitoring and control,
A commercial power supply is used as the power source of the terminal device in a remote monitoring device that is installed in a remote place with this terminal device, is connected with a plurality of terminal devices through a communication line, and is a monitoring station that performs centralized monitoring control. . When this commercial power supply goes out of power,
Since these terminal devices are not operated and the facility equipment cannot be monitored and controlled, the terminal device is equipped with a standby power source so that the monitoring control can be performed even in the case of a power failure.

Secondary batteries such as nickel cadmium storage batteries and sealed lead storage batteries, which are small in size and can be repeatedly used, have been widely used as backup power supplies for this type of terminal device. However, it is difficult to estimate the life of the secondary battery because these terminal devices have a wide range of temperature conditions at the installation site from low temperatures to high temperatures.
Also, the frequency of blackouts of the commercial power source is extremely low, such as several times a year, and most of the secondary battery usage period is in a charging state to supplement the self-discharge amount of the secondary battery. It is difficult to estimate.

For this reason, when a secondary battery is installed in a terminal device that requires highly reliable operation, it must be replaced regularly at a time earlier than its estimated life, or the number of charge / discharge cycles must be counted. Then, the replacement time has to be decided, and there is a drawback that man-hours and costs for maintenance are required.

On the other hand, as a method of easily estimating the deterioration of the battery performance, there is a method of measuring and determining the discharge capacity under constant test conditions.
However, in order to implement this method, it is necessary to take out the secondary battery from the terminal device, and it takes a long time to make the determination. Costs and maintenance costs increase.

To solve this problem, Japanese Patent Laid-Open No. 139828/1984 proposes a system for monitoring a standby power supply for a terminal device. In this proposed system, a comparison circuit that compares the terminal voltage of the secondary battery with a predetermined reference voltage, a quick charging circuit that supplies a quick charging battery of a predetermined value to the secondary battery, and a predetermined voltage from the secondary battery A simulated discharge circuit that discharges a discharge current having a value and a control unit that controls each of these operations are provided.

In this method, when the comparison circuit detects that the terminal voltage of the secondary battery has dropped below the reference voltage, the secondary battery is charged with a predetermined rapid charging current for a predetermined time. Further, the simulated discharge circuit discharges for a predetermined time, and the comparator circuit again compares the terminal voltage of the secondary battery with the reference voltage to determine the deterioration of the secondary battery.

<Problems to be Solved by the Invention> In the proposed method, the circuit configuration becomes complicated, and if this method is provided in each terminal device, the manufacturing cost increases significantly. In addition, the proposed method does not measure the performance characteristics of the secondary battery under an actual load and makes a determination, and thus there is a drawback in that the determination of the performance deterioration is inaccurate.

This invention has been made in view of the current state of the conventionally proposed system, and its purpose is to remove the secondary battery provided for each terminal device easily, inexpensively, and with high accuracy. Another object of the present invention is to provide a remote monitoring device that can determine the deterioration of the secondary battery.

<Means for Solving Problems> In order to achieve the above object, the present invention comprises a secondary battery,
In the event of a power failure, the power source is switched from commercial power to the secondary battery to operate, and a plurality of terminal devices that monitor and control facility equipment are remotely monitored by a monitoring station connected by a communication line via communication means. In the remote monitoring device, the terminal device detects a power failure of the commercial power source and outputs a power failure detection signal, and compares the terminal voltage of the secondary battery with a preset voltage, When the terminal voltage reaches the set voltage, a voltage comparison unit that outputs a set voltage detection signal, and when the power failure detection signal is received, the power source is switched from a commercial power source to the secondary battery and the set voltage detection is performed. When a signal is received, after a predetermined time has elapsed, the monitoring station has a power source switching means for performing a switching operation of disconnecting the secondary battery from the power source, and the monitoring station is operated from the terminal device via the communication line. When a power failure detection signal is received, the time measurement is terminated, the time between them is compared with a preset reference time, and when the time measured is shorter than the reference time, deterioration determination means for outputting a deterioration determination signal is provided. I have.

<Operation> When the commercial power source has a power failure on the terminal device side, the power failure detection means detects the power failure of the commercial power source and outputs a power failure detection signal. The power supply switching means switches the power supply from the commercial power supply to the secondary battery when the power failure detection signal is received. The voltage comparison means compares the terminal voltage of the secondary battery with a preset voltage, and outputs a preset voltage detection signal when the terminal voltage reaches the preset voltage.
The power supply switching means performs a switching operation of disconnecting the secondary battery from the power supply after a lapse of a predetermined time when receiving the set voltage detection signal. On the other hand, on the monitoring station side, when the deterioration determination means receives a power failure detection signal from the terminal device via the communication line, starts timing, and then receives a set voltage detection signal from the terminal device via the communication line. The time measurement is ended, the time in between is compared with a preset reference time, and when the time measured is shorter than the reference time, a deterioration determination signal is output.

<Embodiment> Hereinafter, a monitoring device for a standby power supply for a terminal device according to the present invention will be described in detail based on an embodiment with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, in which a monitoring station 1 for remote monitoring and a terminal device 3 are connected by a communication line 2. The terminal device 3 monitors the state of the equipment under the monitoring of the monitoring station 1.

The terminal device 3 is provided with commercial power supply input terminals 4 and 5, and a constant voltage power supply circuit 6 and a power failure detection circuit 10 which is a power failure detection means are connected in parallel to the input terminals 4 and 5. The load circuit 7 and the charging circuit 8 are connected in parallel to the output terminal of the constant voltage power supply circuit 6.

A secondary battery 9 composed of a plurality of cells is connected in series to the charging circuit 8, and a switching circuit 12 for switching a DC power supply source of the load circuit 7 is connected between the secondary battery 9 and the load circuit 7.

The power failure detection circuit 10 is connected to the terminal device control circuit 13 by a connection line 10a, and the terminal device control circuit 13 and the charging circuit 8 are connected by a connection line 13a. The terminal device control circuit 13 and the switching 12 are connected by a connection line 13b, the terminal device control circuit 13 is connected by a connection line 13c to a timer circuit 14, and the timer circuit 14 is connected by a connection line 14a to the switching circuit 12. It

The input terminal of the comparison circuit 11 which is the voltage comparison means is connected to the connection point between the constant voltage power supply circuit 6 and the load circuit 7, and the comparison circuit
The output terminal of 11 is connected to the terminal device control circuit 13 by a connection line 11a. A communication line 13d connects the terminal device control circuit 13 and the terminal device communication unit 15 which is a communication means.

The monitoring station 1 is provided with a control unit 21. Further, the monitoring station 1 is provided with a monitoring station communication unit 16 connected to the communication line 2, and the monitoring station communication unit 16 uses the reception signal communication line 16a to
It is connected to the signal discriminating unit 17.

The signal discriminating unit 17 is connected to the measuring unit 18 via the connecting line 17a, the measuring unit 18 is connected to the comparing unit 19 via the connecting line 18a, and the comparing unit 19 is connected to the display unit 20 via the connecting line 19a.

Further, the control unit 21 is connected to the monitoring station communication unit 16, the signal discriminating unit 17, the measuring unit 18, the comparing unit 19, and the display unit 20 by a communication line 21a. The measuring unit 18, the comparing unit 19, and the control unit 21 constitute deterioration determining means.

In a normal operating state, the commercial AC voltage from the input terminals 4 and 5 is converted into a DC voltage by the constant voltage power supply circuit 6, and the load circuit 7
Is supplied to. No power failure detection signal is issued from the power failure detection circuit 10, and the secondary battery 9 is charged by the charging current from the charging circuit 8. Since the switching signal is not issued from the terminal device control circuit 13, the switching circuit 12 is not operating.

If a power failure occurs while the terminal device 3 is operating, or if the terminal device is operated during the power failure, the power failure detection circuit 10 outputs a power failure detection signal to the connection line 10a. Connection line 10a
When the power failure detection signal is further supplied, the terminal device control circuit 13
Sends a power failure detection signal to the terminal device communication unit 15 via the communication line 13d.

Further, the terminal device control circuit 13 supplies a charging stop signal to the charging circuit 8 via the connection line 13a, and the charging circuit 8 stops charging the secondary battery 9. At the same time, the terminal device control circuit 13 supplies a switching signal to the switching circuit 12 via the connection line 13b, and the switching circuit 12 operates to supply the voltage of the secondary battery 9 to the load circuit 7. In this way, the secondary battery 9
Is supplied to the load circuit 7, and the terminal device 3 operates.

When the terminal device communication unit 15 receives the power failure detection signal, the terminal device communication unit 15 supplies a notification signal indicating that a power failure accident has occurred in the terminal device 3 to the monitoring station 1 via the communication line 2. When the monitoring station communication unit 16 receives the notification signal, the notification signal is input to the signal discrimination unit 17 via the reception signal communication line 16a. The notification signal is discriminated by the signal discriminating unit 17 and input to the measuring unit 18 via the connection line 17a.

When the measuring unit 18 receives the notification signal from the connection line 17a, it starts measuring time.

When the comparison circuit 11 detects that the terminal voltage of the secondary battery 9 has dropped below the reference voltage, a voltage drop signal is supplied to the terminal device control unit 13 via the connection line 11a.

Upon receiving the voltage drop signal, the terminal device control circuit 13 notifies the terminal device communication unit 15 of the voltage drop of the secondary battery via the communication line 13d. Upon receiving the notification, the terminal device communication unit 15 notifies the monitoring station 1 of the voltage drop of the secondary battery 9 through the communication line 2.

On the other hand, when the terminal device control circuit 13 receives the voltage drop signal, it supplies the timer signal to the timer circuit 14 via the connection line 13c. When receiving the timer signal, the timer circuit 14 supplies a stop signal to the switching circuit 12 via the connection line 14a at the time when the notification of the voltage drop of the secondary battery 9 has been sent to the monitoring station 1. The stop signal stops the supply of the DC voltage from the secondary battery 9 to the load circuit 7.

When the monitoring station communication unit 16 receives the notification of the voltage drop of the secondary battery 9 from the terminal device communication unit 15, the signal discriminating unit 17 connected to the monitoring station communication unit 16 through the reception signal communication line 16a causes the secondary battery Discriminate 9 voltage drop notification.

When the measuring unit 18 receives the notification of the voltage drop of the secondary battery 9 from the signal discriminating unit 17 through the connection line 17a, it stops the time measurement started by the notification of the power failure detection. In this way, the time from the occurrence of the power failure accident of the terminal device 3 to the time of reporting the voltage drop of the secondary battery 9 is measured, and the measured value is the connection line 18
It is output to the comparison unit 19 via a.

The comparison unit 19 compares the preset reference time when the secondary battery is connected to the actual load with the actually measured measurement value. If the measured value is smaller than the determination reference time, the secondary battery 9 deteriorates. Determine that When the comparison unit 19 determines that the secondary battery 9 has deteriorated, the display unit 20 displays the deterioration of the secondary battery 9 and a message that the DC voltage to the load circuit 7 is cut off via the connection line 19a. .

FIG. 2 is a waveform diagram showing the operation of the waist of the standby power supply monitoring device for the terminal device shown in FIG.
The DC voltage 31 is supplied to the load circuit 7 until time a.
From the comparison circuit 11, the logical value of the signal changes from “H” to “L” and the voltage drop signal 32 is issued at the time point b when the terminal voltage of the secondary battery 9 decreases by the reference voltage.

Reference numeral 33 is a secondary battery DC voltage supplied from the secondary battery 9 to the load circuit 7. The logical value of the signal is switched from "L" to "H" at the time of power failure accident a. In this case, t is a timer time limit set by the timer circuit 14.

From the terminal device communication section 15, a notification signal 34 is issued to the monitoring station 1 at the time point a of the power failure accident. Further, the terminal device communication unit 15 issues a notification signal 35 of the voltage drop of the secondary battery 9 at the time point b. In the measuring unit 18, the time measurement value 36 is measured for the time T from the time a when the power failure accident occurs in the terminal device 3 to the time b when the voltage of the secondary battery 9 drops.

In this way, in the present invention, the time T from the time when the power failure accident occurs in the terminal device 3 to the time when the terminal voltage of the secondary battery 9 of the terminal device 3 falls below the reference voltage is measured on the monitoring station 1 side. Measured in part 18. Further, the comparison unit 19 compares the measurement value of the measurement unit 18 with the determination reference time, and when the measurement value of the measurement unit 18 is smaller than the determination reference time, it is determined that the secondary battery 9 is deteriorated.

Since the determination result of the comparison unit 19 is displayed on the display unit 20,
The deterioration of the secondary battery 9 of the terminal device 3 can be detected intensively and reliably in the monitoring station 1 without the individual terminal devices 3 judging each.

<Effects of the Invention> As described above, according to the present invention, when the power failure detection signal output by detecting the power failure of the commercial power supply is received from the terminal device via the communication line on the monitoring station side, the time is measured. After the start, after comparing the terminal voltage of the secondary battery with the preset voltage, when the terminal voltage reaches the preset voltage, the set voltage detection signal that is output is received from the terminal device via the communication line. Time and timing are ended, the time between them is compared with a preset reference time, and when the measured time is shorter than the reference time, it is determined that the secondary battery has deteriorated. The deterioration of the secondary battery used as a power source for switching can be intensively and easily determined when the commercial power source fails, which can reduce the manufacturing cost of the entire system for remote monitoring equipment. Check the secondary battery It is possible to save the trouble of traveling on a business trip and to judge the deterioration of the secondary battery by the actual load when the commercial power supply is cut off. The result can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a waveform diagram showing the operation of the main part of the embodiment of the present invention. 1 ... Monitoring station, 2 ... Communication circuit, 3 ... Terminal device, 6 ...
… Constant voltage power supply circuit, 7 …… Load circuit, 8 …… Charging circuit,
9 ... Secondary battery, 10 ... Power failure detection circuit, 11 ... Comparison circuit, 12 ... Switching circuit, 13 ... Terminal device control circuit, 14 ...
Timer, 18 …… Measurement section, 19 …… Comparison section, 20 …… Display section,
21 ... Control part.

Claims (1)

[Claims] 1. A plurality of terminal devices each having a secondary battery, which are switched from a commercial power source to a secondary battery to operate when a power failure occurs, and are connected to each other via communication means via a communication line to monitor and control facility equipment. In a remote monitoring device configured to remotely monitor the state of the terminal device at a monitoring station, the terminal device detects a power failure of a commercial power source and outputs a power failure detection signal, and a terminal voltage of the secondary battery. And a preset setting voltage, and when the terminal voltage reaches the setting voltage, a voltage comparing unit that outputs a setting voltage detection signal, and when the power failure detection signal is received, the power source is a commercial power source. In addition to switching to the secondary battery, when the set voltage detection signal is received, after a lapse of a predetermined time, power supply switching means for disconnecting the secondary battery from the power supply is provided, and the monitoring station has the terminal device. From when the power failure detection signal is received via the communication line, the clocking is started, when the set voltage detection signal is received from the terminal device via the communication line, the clocking is ended, and the time between A remote monitoring device comprising: deterioration determining means for comparing a preset reference time and outputting a deterioration determination signal when the time measured is shorter than the reference time.