JPH02183181A - Monitoring apparatus of spare power source for terminal equipment - Google Patents

Abstract

PURPOSE:To judge deterioration characteristic of a secondary cell with good accuracy even when an interruption of power supply in a terminal equipment happens many times by measuring a terminal voltage of said secondary cell when said terminal equipment starts operating and after said terminal equipment continues operation for a predetermined time by a measuring apparatus when an interruption accident occurs. CONSTITUTION:When a terminal equipment 3 is driven by a secondary cell 9 subsequent to an interruption of power supply thereto, a terminal voltage of the secondary cell 9 when the equipment 3 starts operating and a predetermined time later is measured by a measuring means composed of a measuring circuit 11, a timer 14 and a terminal equipment controlling circuit 13. Based on the result of the measurement, the attenuation ratio of the secondary cell 9 is operated by an operating means comprised of an operating unit 18 and the controlling circuit 13. This attenuation ratio is compared with a pre-set attenuation ratio by a comparing unit 19. The deterioration of the secondary cell 9 is judged on the basis of the result of this comparison of the unit 19. If it is judged that the secondary cell 9 is deteriorated, a terminal equipment communicating unit 15 of the equipment 3 indicates a monitoring station 1 to generate the information of the deterioration.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a monitoring device for a backup power source for a terminal device used in a remote monitoring device for monitoring and controlling equipment.

<Conventional technology> A terminal device that monitors and controls equipment installed in a building,
This terminal device is installed in a remote location, multiple terminal devices are connected via a communication line, and in a remote monitoring device consisting of a monitoring station that performs centralized monitoring and control, commercial power is used as the power source for the terminal device. be done.

If this commercial power supply fails, these terminal devices will not be activated and will not be able to monitor and control the equipment, so the terminal devices are equipped with a backup power source so that they can monitor and control even in the event of a power outage.

Secondary batteries such as nickel-cadmium storage batteries and sealed lead-acid batteries, which are small and can be used repeatedly, have often been used as backup power sources for this type of terminal equipment. However, since the temperature conditions at the installation location of these terminal devices range widely from low to high temperatures, it is difficult to estimate the lifespan of the secondary battery.

In addition, the frequency of commercial power outages is extremely low, only a few times a year, and most of the time the secondary battery is used is in a charging state to replenish its own capacity, and the replacement cycle of the secondary battery is set. Further, terminal devices are installed under different conditions, and there is no guarantee that they will be installed under the same conditions for a long time, making it difficult to manage secondary batteries.

Therefore, when installing a secondary battery in a terminal device that requires highly reliable operation, it is recommended to replace it regularly at a time earlier than its estimated lifespan, or to determine when to replace it by counting the number of days of repeated charging and discharging. This had the disadvantage of requiring a decision to be made, which increased maintenance time and approval.

On the other hand, as a method for easily estimating the performance deterioration of a battery, there is a method of measuring and determining the discharge capacity under certain test conditions.

However, in order to implement this method, it is necessary to remove the secondary battery from the terminal device, and furthermore, it takes a long time to make the determination, so if it is applied to terminal devices installed in large numbers in a wide area, Manufacturing and maintenance costs will increase.

In order to solve this problem, Japanese Patent Application Laid-Open No. 59-139828
A monitoring device for a backup power source for a terminal device is proposed in the above publication. This proposed method includes a comparison circuit that compares the terminal voltage of the secondary battery with a predetermined reference voltage, a quick charge circuit that supplies a predetermined value of quick charge current to the secondary battery, and a and a control unit that controls the value of the discharge current.

In this method, when a comparison circuit detects that the terminal voltage of a secondary battery has dropped below a reference voltage, the secondary battery is charged with a predetermined rapid charging current for a predetermined period of time. Further, the secondary battery is discharged for a predetermined period of time using a simulated discharge circuit, and the terminal voltage of the secondary battery is compared with a reference voltage using a comparison circuit again to determine whether the secondary battery has deteriorated.

However, in the method according to this proposal, the circuit configuration becomes complicated, and if this method is provided in each terminal device, the manufacturing cost will increase significantly. Furthermore, since the proposed method does not measure and determine the performance characteristics of the secondary battery under an actual load, there is a drawback that the determination of performance deterioration lacks accuracy.

Therefore, in order to solve the problem of the method related to this proposal,
Japanese Unexamined Patent Application Publication No. 62-260525 proposes a new type of monitoring device for a backup power supply for a terminal device.

In the proposed method, the determination means is centrally installed in the monitoring station, and the determination reference time set in advance for each terminal device is compared with the time required for the terminal voltage of the secondary battery to reach the reference voltage value. By doing so, it is possible to accurately determine the deterioration of the secondary battery.

<Problems to be Solved by the Invention> In the method proposed in the above-mentioned Japanese Patent Application Laid-Open No. 62-260525, when a power outage failure occurs in multiple buildings where terminal devices are installed, the monitoring processing device of the monitoring station , will receive notification information from each terminal device and process it.

For this reason, when failures concentrate, the processing load on the monitoring processing device of the monitoring station increases rapidly, causing a problem in that the execution of other processes is significantly delayed.

The present invention has been made in view of the current state of monitoring devices for backup power supplies for terminal devices as described above, and its purpose is to prevent processing delays at the monitoring station even when power outage accidents of terminal devices are concentrated. It is an object of the present invention to provide a monitoring device for a standby power source for a terminal device, which can accurately determine the deterioration characteristics of the secondary battery of each terminal device without causing any problems, and which reduces manufacturing costs.

Means for Solving the Problems> In order to achieve the above object, the present invention includes a terminal device that monitors and controls equipment, and a terminal device that is connected to a plurality of terminal devices by a communication line, and that monitors the status of the plurality of terminal devices. A spare for a terminal device that monitors the secondary battery of a remote monitoring device, the terminal device having a secondary battery arranged in the terminal device, and in the event of a power outage, the terminal device is operated by the secondary battery. In the power supply monitoring device, measuring means measures the terminal voltage of the secondary battery at the time when the operation of the terminal device by the secondary battery starts, and measures the terminal voltage again after a preset predetermined time has elapsed; , a calculation processing means for calculating the attenuation rate of the secondary battery based on the measurement result of the measurement means, and a comparison means for comparing the attenuation rate calculated by the calculation processing means with a preset attenuation rate. and determining means for determining deterioration of the secondary battery based on the comparison result of the comparing means.

The terminal device is provided with an alarm processing means for issuing an alarm to the monitoring station when the determination means determines that the deterioration occurs.

According to the present invention, when a power outage accident occurs and the terminal device is activated by the secondary battery, the measuring means measures the terminal voltage of the secondary battery at the start of operation and after a preset predetermined time has elapsed. .

Then, based on the measurement result of this measuring means, the attenuation rate of the secondary battery is calculated by the arithmetic processing means, and this attenuation rate is compared with a preset attenuation rate by the comparing means, and the comparison result of the comparing means is Based on this, the determination means determines the deterioration of the secondary battery.

If it is determined that the secondary battery has deteriorated through this determination, the notification processing means of the terminal device notifies the monitoring station of the deterioration.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to FIG.

Here, FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

As shown in FIG. 1, a monitoring station 1 that performs remote monitoring and a terminal device 3 are connected to each other via a communication line 2, and the terminal device 3 monitors the status of the equipment that is being monitored by the monitoring station 1. It looks like this.

A commercial power supply input terminal 4.5 is introduced into the terminal device 3,
A constant voltage power supply circuit 6 and a power failure detection circuit 10 are connected in parallel to each other between the input terminals 4 and 5.
A load circuit 7 and a charging circuit 8 are connected in parallel to the output terminal of the battery.

A secondary battery 9 consisting of a plurality of cells is connected in series to this charging circuit 8, and a switching circuit 12 is connected between the secondary battery 9 and the load circuit 7 to supply the voltage of the secondary battery 9 to the load circuit 7. It is connected.

The power failure detection circuit 10 is connected to the terminal device control circuit 13 through a connection line 10a, the terminal device control circuit 13 and the charging circuit 8 are connected to each other through the connection line 13a, and the terminal device control circuit 13 and the switching circuit 12 are connected to each other through a connection line 13a. , are connected to each other by a connecting line 13b. Further, an input terminal of a measuring circuit 11 is connected to a connection point between the secondary battery 9 and the switching circuit 12, and an output terminal of the measuring circuit 11 is connected to a terminal device control circuit 13 through a connecting line 11a.

Further, a timer 14 for controlling the timing of measurement of the terminal voltage of the secondary battery 9 by the measurement circuit 11 is connected to the terminal device control circuit 13 through a connection line 14a.
A calculation unit 18 that calculates the attenuation rate of the secondary battery 9 based on the terminal voltage measured by the terminal voltage 1 is connected by a connection line 18a.

A comparison unit 19 that compares the attenuation rate calculated by the calculation unit 18 and a preset attenuation rate is connected to the calculation unit 18 through a connection line 18b. A terminal communication section 15 is connected to the terminal communication section 15 which notifies the monitoring station 1 of the deterioration through the communication line 2 when it is determined by the comparison by the section 19 that the secondary battery 9 has deteriorated.

The monitoring station 1 includes a monitoring station communication section 1 connected to a communication line 2.
6. A display section 20 and a control section 21 are provided, and the control section 21
The signal line 2 is connected between the and monitoring station communication section 16 and display section 2.0.
1a.

In an embodiment with such a configuration, the measuring circuit 11, the timer 14, and the terminal device control circuit 13 constitute the main part of the measuring means, and the calculation section 18 and the terminal device control circuit 13 constitute the main part of the calculation processing means. ing. Further, the comparison section 19 constitutes the main part of the comparison means and the determination means, and the terminal device communication section 15
constitutes the main part of the alarm processing means.

Next, the operation of the embodiment will be explained.

During normal operation, the commercial AC voltage from the input terminal 4.5 is converted into a DC voltage by the constant voltage power supply circuit 6, and is supplied to the load circuit 7. In this case, the power outage detection circuit 10 does not issue a power outage detection signal, the secondary battery 9 is charged with the charging current from the charging circuit 8, and the terminal device control circuit 13 does not issue a switching signal, and the switching Circuit 12 is not activated.

If a power outage accident occurs while the terminal device 3 is operating, or if an attempt is made to operate the terminal device 3 during a power outage event, a power outage detection signal is sent from the power outage detection circuit 10 to the terminal device control circuit 13 via the connection line 10a. Supplied.

For this purpose, a charging stop signal is supplied from the terminal device control circuit 13 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, a switching signal is supplied from the terminal device control circuit 13 to the switching circuit 12 via the connection line 13b, the switching circuit 12 is activated, the voltage of the secondary battery 9 is supplied to the load circuit 7, and the terminal device The device 3 starts operating with the voltage of the secondary battery 9.

In this way, when voltage supply by the secondary battery 9 is started, a command to measure the terminal voltage of the secondary battery 9 is given to the measurement circuit 11 from the terminal device control circuit 13 via the connection line 11a, and the measurement The measured value of the terminal voltage of the secondary battery 9 is input from the circuit 11 to the terminal device control circuit 13 via the connection line 11a, and this measured value is input from the terminal device control circuit 13 to the calculation unit 18 via the connection 1118a. is input.

On the other hand, the connection line 1 is connected to the timer 14 from the terminal device control circuit 13.
4a, a power outage detection signal is input when a power outage accident occurs, and the timer 14 starts measuring time based on this power outage detection signal.
A clock signal is input to the terminal device control circuit 13 from the terminal device control circuit 13. Based on this clock signal, a measurement command is given again from the terminal device control circuit 13 to the measurement circuit 11, the terminal voltage of the secondary battery 9 is measured again, and the measured value is sent from the measurement circuit 11 via the terminal device control circuit 13. and is input to the calculation unit 18.

Therefore, the calculation unit 18 calculates the value of the secondary battery 9 based on the two measured values of the secondary battery 9 (the terminal voltage at the start of operation and the terminal voltage after a predetermined period of time) input from the terminal device control circuit 13.
The attenuation rate is calculated and the calculated value is input to one comparison section via the connection line 18b. The comparison unit 19 compares the attenuation rate input from the calculation unit 18 with a preset attenuation rate, and if the measured attenuation rate is larger than the preset attenuation rate, the secondary battery 9 It is determined that it has deteriorated.

When the comparison unit 19 determines that the secondary battery 9 has deteriorated, the comparison unit 1
Connect from 9! Terminal device communication section 1 via l19a
5, deterioration information of the secondary battery 9 is input.

When the deterioration information of the secondary battery 9 is input to the terminal device communication section 15, the deterioration information is reported and transmitted from the terminal device communication section 15 to the monitoring station 1 via the communication line 2.

This deterioration information is input to the monitoring station communication section 16 of the monitoring station 1 in the same manner as other various information. Control unit 21 of monitoring station 1
After analyzing the content of the information received by the starting station communication unit 16 via the signal line 21a and confirming the deterioration information, the deterioration information of the secondary battery 9 is displayed on the display unit 20 via the signal line 21a. . Then, the secondary battery of the terminal device whose deterioration information is displayed on the display unit 20 is replaced.

In the embodiment, since the deterioration of the secondary battery 9 is determined under the actual load condition, the determination accuracy is high, and even if there are many power outage accidents at the terminal equipment, the processing at the monitoring station will not be delayed, and the manufacturing cost will be reduced. The device can be constructed at low cost.

<Effects of the Invention> As explained in detail above, the present invention provides a spare for a terminal device that is constructed with a simple circuit at low manufacturing cost and that accurately determines the deterioration of the secondary battery of the terminal device under actual load conditions. A power supply monitoring device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. 1...Monitoring station, 2...Communication line, 3.
... terminal device, 6 ... constant voltage power supply circuit,
7...Load circuit, 8...Charging circuit, 9
...Secondary voltage, 1o...Power failure detection circuit, 11...Measurement circuit, 12...Switching circuit, 13...Terminal device Control circuit, 14...
...Timer, 15...Terminal device communication section, 16.
...Monitoring station communication section, 18...Calculation section, 1
9... Comparison section, 2o... Display section, 21
...control section.

Claims (1)

[Claims] It has a terminal device that monitors and controls equipment, and a monitoring station that is connected to a plurality of terminal devices via a communication line and monitors the status of the plurality of terminal devices, and a secondary battery is disposed in the terminal device. In a monitoring device for a standby power source for a terminal device that monitors the secondary battery of a remote monitoring device in which the terminal device is operated by the secondary battery during a power outage, when the terminal device starts operating by the secondary battery. measuring means for measuring the terminal voltage of the secondary battery and measuring the terminal voltage again after a preset predetermined time has elapsed; and based on the measurement result of this measuring means, the attenuation rate of the secondary battery is determined A calculation processing means for calculating, a comparison means for comparing the attenuation rate calculated by the calculation processing means and a preset attenuation rate, and a deterioration determination of the secondary battery based on the comparison result of the comparison means. and an alarm processing means that issues an alarm to the monitoring station when the determination means determines that the deterioration has occurred.
A monitoring device for a standby power source for a terminal device, characterized in that it is provided in the terminal device.