JPH09237640A - Battery deterioration condition testing device for ac uninterruptive power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a load from being tripped even by performing a discharge power test of a storage battery, when a breaker is placed in an off-condition. SOLUTION: When a discharge test start command is output from a discharge power test starting circuit 8, an inverter circuit 5 is driven, discharging of a storage battery 3 is started. After starting a discharge of the storage battery 3, input voltage of the inverter circuit 5, that is, voltage of the storage battery 3 is detected by a storage battery voltage supervising means 60. In a control part 70, a voltage changing rate of the storage battery 3 is measured. In the control part 70, when the voltage changing rate is larger than a predetermined reference value, a discharge test is stopped, also an alarm is generated from an alarm device 12. When the discharge test is stopped, operation is stopped in the inverter circuit 5, AC power is supplied to a load 13 from an AC power source 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery deterioration state testing device for an AC uninterruptible power supply device which uses an inverter circuit fed by a storage battery together with a commercial power supply.

[0002]

2. Description of the Related Art A storage battery used in an AC uninterruptible power supply as described above needs to be replaced periodically.
For lead-acid batteries, 3 to 5 years is a standard for replacement. However, the degree of deterioration of the storage battery differs depending on the usage environment. For example, a storage battery used in a high temperature place deteriorates faster than a storage battery used in a low temperature place.

Therefore, as a conventional method for determining the deterioration state,
As disclosed in JP-A-5-15085, in order to determine the deterioration state of the storage battery, AC power is supplied from the storage battery to a load through an inverter circuit to discharge the storage battery, and the voltage of the storage battery at that time is monitored. A method has been proposed in which the deterioration state of the storage battery is determined from the change in the discharge time by measuring the time until the voltage of the storage battery falls below a reference value. In this method, if the result of the storage battery discharge capacity test shows that the storage battery voltage has dropped below the reference value within a predetermined time, it is determined that the battery has deteriorated and it is time to replace it, and an alarm is issued. To inform the user. If the user acknowledges this alarm, the storage battery is replaced. When replacing the storage battery, the storage battery breaker that disconnects the storage battery from the circuit used is once turned off (opened), the storage battery is replaced, and then the storage battery breaker is turned on again (closed).

[0004]

When the discharge capacity test of the conventional storage battery described above is performed, the storage battery breaker, which should originally be in the ON state, may be turned OFF due to forgetting to switch. In such a case, if the inverter circuit is driven to supply power to the load for the discharge capability test, the voltage of the storage battery (monitoring voltage) will drastically decrease as shown in FIG. Therefore, there is a problem that the output voltage for supplying electric power to the load is also lowered as shown in FIG. 5, and the load is lowered.

Since the storage battery breaker must be turned off once when replacing the storage battery, there is a risk of human error in forgetting to turn on the breaker after replacing the storage battery. If you make this mistake, when you perform the discharge capacity test of the storage battery,
The situation where the load goes down occurs sufficiently.

Further, even if the storage battery discharge capability test is not carried out, the storage battery breaker is OF
When it is F, the inverter circuit cannot be driven, so
There is a problem that the original purpose of the AC uninterruptible power supply cannot be achieved.

It is an object of the present invention to provide a storage battery deterioration state test device for an AC uninterruptible power supply, which does not reduce the load even when a discharge capacity test of the storage battery is performed when the breaker is in the OFF state. It is in.

Another object of the present invention is to provide a storage battery deterioration state testing device for an AC uninterruptible power supply, which stops the discharge capacity test of the storage battery when the breaker is in the OFF state and notifies that the breaker is in the OFF state. To do.

[0009]

DISCLOSURE OF THE INVENTION The present invention is directed to the deterioration of a storage battery of an AC uninterruptible power supply which supplies AC power from an inverter circuit to a load by using a storage battery connected via a breaker as a power supply when the AC power supply fails. A storage battery deterioration state test device of an AC uninterruptible power supply device, which determines the state by discharging a storage battery to a load through an inverter circuit and judging from a discharge state at that time, is an object of improvement.

The storage battery deterioration state testing apparatus of the present invention measures the voltage change rate of the input voltage of the inverter circuit after starting the discharge of the storage battery, and performs the discharge test when the voltage change rate is larger than a predetermined reference value. The discharge test stopping means for stopping is provided. Here, the “predetermined reference value” is the average value of the change rate of the input voltage of the inverter circuit when the breaker is turned off and the inverter circuit is operated, and is calculated from the average value of the actually measured change rate. Is also set as the reference value. If you look at safety, 1 of the average value of the actual change rate
It is preferable to set this reference value to about / 2.

In the storage battery deterioration state test apparatus of the present invention, when the discharge test of the storage battery is performed when the storage battery breaker is OFF, the discharge test stopping means immediately stops the discharge test. When the discharge test is stopped, the power supply to the load is switched from the power supply from the inverter circuit to the power supply from the AC power supply, so that the load does not go down.

Further, as a means for surely preventing the occurrence of the load down, the side closer to the AC power source than the storage battery breaker is
It is advisable to connect a capacitor that is charged through the charging circuit of the storage battery and discharged through the inverter circuit. The capacity of this capacitor is set to a capacity capable of supplying the necessary power to the load for a time longer than the determination time required by the discharge test stopping means. Incidentally, in the case of a general AC uninterruptible power supply, the capacity of this capacitor may be about 3000 μF.
If such a capacitor is not used, the monitor voltage will drop faster, so the above-mentioned "predetermined reference value"
Is used as 1/3 to 1/5 of the average value of the actually measured change rate.

In the storage battery deterioration state test apparatus of the present invention, the discharge test stopping means stops the discharge test of the storage battery and also issues an alarm notifying that the storage battery breaker is in the OFF state. When the user recognizes this alarm and turns on the breaker, the load is prevented from being lowered and the discharge test of the storage battery can be satisfactorily performed.

An AC uninterruptible power supply using the storage battery deterioration state testing apparatus of the present invention is equipped with, for example, power failure monitoring means for monitoring the occurrence of a power failure of the AC power supply, and is charged by the output of a charging circuit for rectifying the output of the AC power supply. It is equipped with a storage battery. The mutual connection between the charging circuit and the storage battery should be O.
It has a breaker that turns off and on. Further, it is provided with an inverter circuit that outputs AC power using a storage battery as a power source, and inverter control means that outputs an operation signal to the inverter circuit. Then, it operates according to the switching command, constantly supplies AC power to the load from the AC power supply, and when the power failure monitoring means detects the occurrence of power failure, it starts the inverter circuit,
It has a switching circuit that supplies AC power from the inverter circuit to the load.

The storage battery deterioration state tester used for such an AC uninterruptible power supply device discharges the storage battery to a load through an inverter circuit and determines the deterioration state of the storage battery from the discharged state. Next, to describe its more specific configuration, it is provided with a storage battery voltage monitoring unit that monitors the input voltage of the inverter circuit as the voltage of the storage battery, and a timer that starts counting time when a discharge test command is input. There is. This discharge test command may be automatically generated by providing means for periodically generating this command, or may be generated by pressing a push button switch. When the discharge test command is input, the storage battery deterioration state test device outputs a switching command for forcibly switching the switching circuit so as to supply AC power to the load from the inverter circuit, and monitors the storage battery voltage monitoring means. The storage battery deterioration state determination means for determining a deterioration state of the storage battery on the basis of the voltage, and issuing an alarm when the deterioration is determined. Further, when the discharge test command is input, the voltage change rate of the voltage monitored by the storage battery voltage monitoring means is monitored, and when the voltage change rate is larger than a predetermined value, AC power is supplied from the AC power source to the load. As described above, the discharge test stopping means for outputting a switching command for forcibly switching the switching circuit and for issuing an alarm is provided.

In the storage battery deterioration state test device having the above-described specific configuration, when the discharge test of the storage battery is performed with the storage battery breaker turned off, the discharge test of the storage battery is stopped to surely reduce the load. It also prevents and informs the user that the breaker is in the OFF state.

If a capacitor that discharges through the inverter circuit is connected between the connection point between the storage battery breaker and the charging circuit and the negative electrode of the storage battery, the load will be reduced when the discharge test is performed with the breaker turned off. The occurrence can be prevented more reliably.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In the figure, 1 is a commercial AC power supply, 2 is a charging circuit that rectifies the output of the commercial AC power supply 1, 3 is a storage battery that is charged by the output of this charging circuit 2, and 4 is between the charging circuit 2 and the storage battery 3. It is a storage battery breaker (called a breaker) arranged. Reference numeral 5 is an inverter circuit that outputs AC power using a storage battery as a power source, and 13 is a load.
Reference numeral 9 is a switch arranged between the commercial power source 1 and the load 13, and 10 is a switch arranged between the output end of the inverter circuit 5 and the load 13. Reference numeral 11 is a capacitor connected between the connection point between the breaker 4 and the charging circuit 2 and the negative electrode of the storage battery 3.

61 is a commercial power supply voltage and the inverter circuit 5
A / D converter for A / D converting each input voltage of the
0 is a storage battery voltage monitoring means for monitoring the voltage of the storage battery 3 based on the A / D conversion output of the input voltage of the inverter circuit 5,
Reference numeral 62 is a power failure monitoring means for monitoring the power failure of the commercial power source based on the A / D conversion output of the commercial power source voltage.

Reference numeral 70 denotes a control unit, to which the outputs of the storage battery voltage monitoring means 60 and the power failure monitoring means 62 are input. 74 is a timer that starts counting time when a discharge test command is input and outputs a time signal to the control unit 70. Reference numeral 75 is a memory or ROM that stores a program for operating the control unit 70 and predetermined reference data, and 76 is a rewritable memory or RAM that is used to store temporal changes in the voltage of the storage battery 3. 71 is the control unit 7
PW to the inverter circuit 5 based on the control signal from 0.
It is a PWM signal generation circuit that outputs an M signal. Reference numeral 73 is a signal input port to the control unit 70, and 72 is a signal output port from the control unit 70. Block M surrounded by a broken line in FIG.
The configuration of C is realized by using a microcomputer.
Therefore, the storage battery voltage monitoring means 60, the power failure monitoring means 6
2. All of the control unit 70 and the PWM signal generation circuit 71 are realized by software. Reference numeral 8 is a discharge capacity test starting circuit that outputs a discharge test command to the input port 73, and reference numeral 12 is an alarm device that issues an alarm in response to an alarm signal from the output port 72. This alarm device is the control unit 7 described above.
It is combined with 0 to form a part of the storage battery deterioration state determining means and the discharge test stopping means. The switches 9 and 10 described above are turned on according to the switching signal from the output port 72.
・ Construct a switching circuit that turns off.

Next, the operation of the apparatus shown in FIG. 1 will be described. In the storage battery deterioration state test device of the uninterruptible power supply according to the present invention, the charging circuit 2 converts the AC power of the commercial power supply 1 into the DC power to charge the storage battery 3. Then, normally, the control unit 70 turns on the switch 9 and turns off the switch 10 by the switching signal output via the output port 72, and supplies the AC power from the commercial power supply 1 to the load 13. At the time of power failure of the commercial power source, the control unit 70 is activated by the detection signal of the power failure monitoring means 62.
With the switching signal output from the output port 72 from the switch 9, the switch 9 is turned off and the switch 10 is turned on, and the PWM signal (inverter drive signal) 7a is output from the PWM signal generation circuit 71 to drive the inverter circuit 5. To do. As a result, the power of the storage battery 3 is converted into AC power by the inverter circuit 5 and supplied to the load 13.

In the maintenance operation of the uninterruptible power supply, when performing a discharge test to check the deterioration state of the storage battery 3, the discharge capacity test start circuit 8 outputs the discharge test command 8a and the input port 73 is used. Then, the discharge test command 8a is given to the control unit 70. As a result, the control unit 70 sends the PW to the inverter circuit 5 via the PWM signal generation circuit 71.
At the same time as transmitting the M signal 7a, the switch 9 is turned off and the switch 10 is turned on via the output port 72. The inverter circuit 5 converts DC power supplied from the storage battery 3 via the breaker 4 into AC power and supplies the AC power to the load 13 through the switch 10. The load 13 is specifically assumed to be a personal computer, office computer, POS, etc.
It is a load that is practically no problem even if there is some power down time (power failure time). In the above-described inverter output power supply state, the storage battery voltage monitoring means 60 samples the voltage of the storage battery 3 via the A / D converter 61 at a time interval of 800 μs and transmits the sampling result to the control unit 70.

In this embodiment, since the discharge capacity test starting circuit 8 is realized by the push button switch, the discharge test command 8a is generated by the user's action of pressing this switch. Alternatively, the same function can be achieved by using an IC that generates a pulse signal at regular time intervals instead of the push button switch.

As described above, when the discharge capacity test of the storage battery 3 is started, when the storage battery 3 is not yet deteriorated, the storage battery voltage slowly decreases over a long time as shown in FIG. Go. When the storage battery 3 is deteriorated,
The storage battery voltage drops in a relatively short time as shown in FIG.

When a 1 kW POS is assumed as the load 13, a specification of an AC uninterruptible power supply for this type of load requires a power failure backup time of 60 minutes. Therefore, if a storage battery capable of discharging at 1 kW for 60 minutes is selected, it is necessary to use 12 sealed lead storage batteries having a nominal voltage of 12 V and a capacity of 7 Ah. If the discharge efficiency of the storage battery 3 is normal, a voltage of 144V will be detected at the start of the discharge test. In addition, in the pass / fail judgment of the deterioration of the storage battery, it was determined that the storage battery voltage was 137 V or more 30 minutes after the start of the discharge test. That is, as shown in FIG. 2, when the storage battery voltage is 137 V or higher after 30 minutes, the storage battery 3 is normal, and as shown in FIG.
When the voltage drops below V, it is determined that the storage battery 3 has deteriorated.

When the deterioration of the storage battery 3 is determined, the control unit 70
Transmits an alarm signal 7b to the alarm device 12 via the output port 72. As a result, the alarm device 12 issues an alarm to notify the user of the deterioration of the storage battery 3. The user may replace the storage battery 3 with a non-defective product when this alarm is issued.
In this replacement, the breaker 4 must be turned off, the storage battery 3 must be replaced, and then the breaker 4 must be turned on. However, if the user forgets to turn the breaker 4 back on and makes an artificial mistake of leaving it in the off state, the storage battery voltage monitoring means 60 will be used the next time the discharge test of the storage battery 3 is performed. The monitoring voltage of No. 2 suddenly drops in 3 to 5 ms as shown in FIG. Further, in the conventional uninterruptible power supply, the power supplied to the inverter circuit 5 is reduced, so the inverter output voltage is also reduced as shown in FIG. 5, and the load 13 is also reduced. Therefore, in this embodiment, as shown in FIG.
Is arranged to improve the drop in the monitoring voltage of the storage battery voltage monitoring means 60 as shown in FIGS. 7 to 4, and at the same time, the drop in the monitoring voltage is immediately detected by the method described below to take appropriate measures. I chose The capacitance of the capacitor 11 used in this example was 3000 μF.

In the present embodiment, in order to distinguish between the case where the monitored voltage of the storage battery 3 drops relatively slowly as shown in FIG. 2 or 3, and the case where it drops sharply as shown in FIG. , Decided to calculate the change of the monitoring voltage per unit time. That is, the storage battery voltage monitoring means 60 detects a change amount ΔV of the monitoring voltage during a minute unit time Δt to detect ΔV.
/ Δt, that is, the voltage change rate is calculated. When the breaker 4 is ON, the storage battery voltage drops as shown in FIG. 2 or FIG. 3, so ΔV / Δt becomes a small value. On the other hand, if the breaker 4 is OFF, the monitoring voltage drops as shown in FIG. 4, so ΔV / Δt becomes a large value. Therefore, when ΔV / Δt is large, the breaker 4 is turned off.
It is determined that the state is in the state, the alarm device 12 is operated by the alarm signal from the control unit 70, and the switches 9 and 10 are switched by the switching signal to switch the power supply to the load 13 from the inverter circuit 5 to the commercial power source 1. As a result, the discharge test is stopped to prevent the load 13 from going down.

Whether or not the voltage change rate ΔV / Δt is a large value can be easily determined by comparison with a reference value. In this embodiment, after the discharge test command 8a is input, the voltage change rate of the voltage monitored by the storage battery voltage monitoring means 60 is monitored, and when the voltage change rate is larger than a predetermined value, the AC power source 1 loads 13 A discharge test stopping means for outputting a switching command for forcibly switching the switching circuit (9, 10) so as to supply AC power to the device and generating an alarm from the alarm device 12 is realized by software inside the control unit 70. ing. Here, in the present embodiment, the "predetermined reference value" is a reference value for determining whether the breaker 4 is ON or OFF, and the inverter circuit 5 when the breaker 4 is turned off and the inverter circuit 5 is operated. The average value of the change rate of the input voltage is measured in advance, and a value smaller than the average value of the change rate of the actual measurement is set as the reference value. Specifically, it is set to about 1/2 of the average value of the actually measured change rates. More specifically, how to set the value of the reference value depends on the curve of the decrease of the monitoring voltage in FIG. That is, since the degree of decrease in the monitoring voltage increases with time, the value of ΔV / Δt also increases with time. Therefore, in order to prevent the load from being reduced, it is determined how much the monitoring voltage should drop before stopping the power supply from the inverter circuit.
In this embodiment, as shown in FIG. 4, the monitoring voltage drops from 144 V to 137 V within 8 ms, so ΔV / Δ
The average of t is (144-137) /8=0.875. Therefore, the reference value K of whether the breaker is ON or OFF is
A value 0.4 which is 1/2 of the average value of ΔV / Δt is set.

Further, in this embodiment, when the discharge test command 8a is input, a switching command for forcibly switching the switching circuits (9, 10) so as to supply AC power to the load 13 from the inverter circuit 5 is output, The deterioration state of the storage battery 3 is determined based on the voltage monitored by the storage battery voltage monitoring means 60,
A storage battery deterioration state determination unit that issues an alarm from the alarm device 12 when the deterioration state of the storage battery 3 is determined is also realized by software inside the control unit 70.

The software algorithm for realizing the storage battery voltage monitoring means 60 will be described below. In order to facilitate understanding, a flowchart showing a software algorithm for operating a microcomputer for controlling a conventional device will be described first, and then FIG. 8 will be used to explain the software algorithm used in the present embodiment. A comparative explanation will be given by using.

First, a conventional method of detecting a decrease in the storage battery voltage will be described according to the steps of FIG. When the discharge test of the storage battery starts, first, in step ST1, it is checked whether or not the discharge test start signal 8a is received from the discharge capacity test start circuit 8. If not received, loop and wait until it is received. If so, go to the next step ST2. In step ST2, the inverter drive signal (PWM signal) 7a is transmitted to the inverter circuit 5 through the PWM signal generation circuit 71. This drives the inverter circuit 5. In the next step ST3, the switch 9 is turned off and the switch 10 is turned on.
As a result, AC power is supplied from the storage battery 3 to the load 13 through the inverter circuit 5. In step ST4, a 30-minute timer for the discharge test of the storage battery is started. In step ST5, the voltage of the storage battery 3 is read through the A / D converter 61 and the storage battery voltage monitoring means 60 and is set to V1. In step ST6, it is checked whether the read voltage V1 is 137V or higher. The voltage V1 is 137
When it is V or more, it is checked in step ST7 whether or not the timer reaches 30 minutes. When the voltage V1 is less than 137V, the alarm signal 7b is transmitted to the alarm device 12 through the output port 72 in step ST8. When the voltage V1 is 137V or more and the timer is within 30 minutes, after delaying the sampling interval by 800 μs in step ST9, the process returns to step ST5 described above until the voltage V1 becomes less than 137V or the timer passes 30 minutes. Step ST5
Repeat ST9. When the voltage V1 is 137 V or more and the timer has passed 30 minutes, and when the alarm signal 7b is transmitted, the timer is stopped in step ST10.
In the next step ST11, the transmission of the inverter drive signal 7a is stopped and the drive of the inverter circuit 5 is stopped. In step ST12, the switch 10 is turned off and the switch 9 is turned on. As a result, from the storage battery 3 to the load 13
Supply to the load is stopped, and the power supply is switched from the commercial power supply to the load.

In the conventional method for detecting a decrease in the storage battery voltage according to the flow chart shown in FIG. 8, the monitoring voltage of the storage battery voltage monitoring means is 1 even when the breaker is OFF as shown in FIG.
No abnormality can be detected until the voltage reaches 37V, and even if the switches 9 and 10 are operated at the time of detection to switch the power supply to the load from the inverter to the commercial power supply, the output voltage waveform to the load is as shown in FIG. It ends up causing the load to go down.

Next, the software algorithm used in the embodiment of the present invention will be described with reference to the flowchart of FIG. In this flowchart, steps ST1 to ST
5 is the same as the conventional steps ST1 to ST5 in FIG. In step ST6 of FIG. 9, the voltage of the storage battery (input voltage of the inverter circuit) is read in similarly to step ST5. Let this be V2. At this point, V1 = V2. In the next step ST7, (V1 -V2) / [Delta] t is calculated to obtain the voltage change rate [Delta] V / [Delta] t. In this embodiment, Δt is a sampling interval of 800 μs. And step ST8
Then, it is checked whether or not ΔV / Δt is smaller than a predetermined reference value K (0.4). The value of ΔV / Δt is 0.4
When it is smaller, it goes to step ST9 without judging that the breaker 4 is OFF, and when ΔV / Δt is 0.4 or more, it is judged that the breaker 4 is OFF and step ST1.
1 and sends an alarm signal 7b that the breaker 4 is OFF to the alarm device 12. In step ST9, step ST
It is checked whether the read voltage V2 at 6 is 137V or higher. When V2 is 137V or higher, next step ST
At 10, check if the timer has reached 30 minutes. When V2 is less than 137V, the process goes to step ST12 to send the alarm signal 7b indicating the deterioration of the storage battery to the alarm device. V2 is 13
When the voltage is 7V or more and the timer is within 30 minutes, step S
A delay of 800 μs is added to the sampling interval at T13. In the next step ST14, V2 → V1 is set, the process returns to the previous step ST6, and steps ST6 to ST13 are repeated. When the timer is determined to be 30 minutes or more in step 10, the following steps ST10 to ST in FIG.
Perform steps ST15 to ST17 similar to 12,
The detection operation of the decrease in the storage battery voltage is completed.

In the algorithm of FIG. 9, the time point at which the storage battery monitoring voltage suddenly drops can be determined by the value of ΔV / Δt, so that it can be detected when the breaker 4 is OFF. When the breaker 4 is detected to be off, the discharge test of the storage battery 3 is stopped, and the power supply to the load is switched to the commercial power source 1, the waveform of the output voltage to the load 13 becomes as shown in FIG. Down is prevented.

[0035]

As described above, according to the storage battery deterioration state test device for the AC uninterruptible power supply according to the present invention, when the AC power supply fails, the storage battery connected through the breaker is used as a power source for the inverter circuit. In the AC uninterruptible power supply that supplies AC power to the load from the storage battery, discharge the storage battery to the load through the inverter circuit, and when determining the deterioration state of the storage battery from the discharge state, input voltage of the inverter circuit after starting the discharge The discharge test is stopped when the voltage change rate is larger than a predetermined reference value.Therefore, the discharge test is performed with an artificial error that the breaker is off. If
It is possible to prevent the load from going down without stopping the power supply to the load.

Then, when the breaker is in the OFF state, the discharge test of the storage battery can be stopped and the fact that the breaker is in the OFF state can be notified.

[Brief description of drawings]

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

FIG. 2 is a characteristic curve diagram showing an example of discharge characteristics of a normal storage battery.

FIG. 3 is a characteristic curve diagram showing an example of discharge characteristics of a deteriorated storage battery.

FIG. 4 is a characteristic curve diagram showing changes in the monitoring voltage when the breaker is off in the embodiment of the present invention.

FIG. 5 is a waveform diagram showing an output voltage during a discharge test when the breaker is off in the case of using the conventional device.

FIG. 6 is a waveform diagram showing an output voltage during a discharge test when the breaker is off in the example of the present invention.

FIG. 7 is a characteristic curve diagram showing a change in monitoring voltage when a breaker is off when a conventional device is used.

FIG. 8 is a flowchart showing an algorithm of software used in a discharge test of a storage battery in a conventional device.

FIG. 9 is a flow chart showing an algorithm of software used for a discharge test of a storage battery in an embodiment of the present invention.

[Explanation of symbols]

 1 Commercial AC Power Supply 2 Charging Circuit 3 Storage Battery 4 Breaker 5 Inverter Circuit 60 Storage Battery Voltage Monitoring Means 61 A / D Converter 62 Power Failure Monitoring Means 70 Controller 71 PWM Signal Generation Circuit 72 Output Port 73 Input Port 74 Timer 75 ROM 76 RAM 8 Discharge capacity test start circuit 9,10 Switch 11 Capacitor 12 Alarm device 13 Load MC microcomputer

Claims (5)

[Claims] 1. A deterioration state of the storage battery of an AC uninterruptible power supply for supplying AC power from an inverter circuit to a load by using a storage battery connected via a breaker as a power source when the AC power supply has a power failure. A storage battery deterioration state test device of an AC uninterruptible power supply device that discharges to the load through a circuit and determines from the discharge state thereof, and measures a voltage change rate of an input voltage of the inverter circuit after starting the discharge, A storage battery deterioration state test apparatus for an AC uninterruptible power supply, comprising a discharge test stopping means for stopping a discharge test when a voltage change rate is larger than a predetermined reference value. 2. The AC power source side with respect to the breaker,
The storage battery deterioration state testing device for an AC uninterruptible power supply device according to claim 1, wherein a capacitor that is charged through a charging circuit of the storage battery and discharged through the inverter circuit is connected. 3. The storage battery deterioration state test of the AC uninterruptible power supply according to claim 1, wherein the discharge test stopping means generates an alarm for stopping the discharge test and notifying that the breaker is in an off state. apparatus. 4. A power failure monitoring means for monitoring the occurrence of a power failure of the AC power supply, a charging circuit for rectifying the output of the AC power supply, a storage battery charged by the output of the charging circuit, the charging circuit and the storage battery. A breaker arranged between the two, an inverter circuit that outputs AC power from the storage battery as a power source, and operates in response to a switching command, always supplies AC power to the load from the AC power supply, and the power failure monitoring means A switching circuit (9, 10) that starts the inverter circuit to detect the occurrence of a power failure and supplies AC power to the load from the inverter circuit, and an inverter control means (70, 71) that outputs an operation signal to the inverter circuit. ) Is provided to the AC uninterruptible power supply device, the storage battery is discharged to the load through the inverter circuit, and the storage state is changed from the discharged state. A storage battery deterioration state tester for an AC uninterruptible power supply that determines a deterioration state of a battery, and a storage battery voltage monitoring means (5) for monitoring the input voltage of the inverter circuit as the voltage of the storage battery, and a discharge test command are input. Then, a timer (74) that starts counting time and outputs the switching command that forcibly switches the switching circuit so that AC power is supplied from the inverter circuit to the load when the discharge test command is input. Then, a storage battery deterioration state determination means (70, 70) for generating a warning when determining the deterioration state of the storage battery based on the voltage monitored by the storage battery voltage monitoring means and determining the deterioration state of the storage battery
11) and monitoring the voltage change rate of the voltage monitored by the storage battery voltage monitoring means after the discharge test command is input, and when the voltage change rate is larger than a predetermined reference value,
Discharge test stopping means (70, 70) for outputting the switching command for forcibly switching the switching circuit to supply AC power from the AC power source to the load and for issuing an alarm.
11) A storage battery deterioration state test device for an AC uninterruptible power supply, comprising: 5. A storage battery deterioration of the AC uninterruptible power supply device according to claim 4, wherein a capacitor discharging through the inverter circuit is connected between a connection point between the breaker and the charging circuit and a negative electrode of the storage battery. Condition test equipment.