JP3562633B2 - Capacitor uninterruptible power supply - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention switches a capacitor power storage device having a plurality of capacitors and a parallel monitor connected in parallel to each of the capacitors to detect and control a charging voltage and a current to an input power supply and a load via charge / discharge control means. The present invention relates to a capacitor uninterruptible power supply which performs connection and charge / discharge.
[0002]
[Prior art]
A conventional uninterruptible power supply uses a secondary battery. Such an uninterruptible power supply does not function as an uninterruptible power supply in the event of a power outage if the life of the battery has expired. Therefore, it is necessary to check the functional state of the battery from time to time. In order to enhance reliability, many improvements have been made to, for example, a self-inspection function that tests whether the battery operates normally and a function that predicts the remaining battery level and the operable time. Incidentally, as the life determining means, there are many such as JP-A-6-217473, JP-A-7-85891, JP-A-7-298503, JP-A-6-88155 and JP-A-8-308125. A proposal has been made.
[0003]
[Problems to be solved by the invention]
However, since various methods for improving the reliability of an uninterruptible power supply depend on the characteristics of conventional secondary batteries, it is difficult to accurately measure the remaining amount even when measuring the remaining amount. As for the reliability of the battery, it is difficult to predict a sudden failure due to the occurrence of dendrite in a normal battery at a certain point in time, and it is difficult to improve the reliability of the system. Regarding the prediction of the backup available time, in the case of a secondary battery, if the remaining amount is to be estimated from the terminal voltage, the magnitude of the change due to the remaining amount of the terminal voltage is greatly affected by the temperature and the operating state. It is generally known that this information is buried in other components, so that it is generally difficult.
[0004]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is to provide a simple and accurate prediction and diagnosis information.
[0005]
For this purpose, the present invention provides a capacitor power storage device having a plurality of capacitors and a parallel monitor connected in parallel to each of the capacitors to detect and control the charging voltage and current. In a capacitor uninterruptible power supply that switches and connects and charges and discharges, a voltage and an output current of the capacitor power storage device are detected.Calculating a remaining capacity based on the capacitance of the capacitor power storage device and the detected voltage, obtaining power consumption based on the detected voltage and the output current, and estimating an operable time based on the obtained remaining capacity and the power consumption. Is performed, and the deterioration of the capacitor is determined by obtaining the decrease in the capacitance based on the amount of the power consumption obtained in the predetermined time and the change in the voltage detected during the predetermined time.A diagnostic means is provided, which outputs prediction of operable time and determination of deterioration of the capacitor.
[0006]
Further, the diagnosis means predicts and displays a backup available time based on the remaining capacity and the average power consumption of a predetermined time, and the diagnosis means obtains a decrease in capacitance based on the change in the remaining capacity and the voltage. Diagnosing the deterioration of the capacitor, the diagnostic means extracts a terminal voltage of at least one of the plurality of capacitors as a circuit for obtaining a remaining capacity, and connects a load resistance element in series with a circuit including one or more nonlinear resistance elements. And the current flowing through the load resistance element is detected, and the remaining capacity is obtained by broken line approximation.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a capacitor uninterruptible power supply according to the present invention, wherein 1 is a capacitor power storage device, 2 is a charger, 3 is an output control circuit, 4 is an uninterruptible control circuit, and 5 is a switching circuit. , 6 denotes a current detection circuit, 7 denotes a prediction / diagnosis processing circuit, 8 denotes a prediction / diagnosis output circuit, 9 denotes a parallel monitor, and C denotes a capacitor.
[0008]
In FIG. 1, a capacitor power storage device 1 is composed of a number of capacitors C connected in series and parallel and a parallel monitor 9 connected in parallel to each of the capacitors C, and is a power storage device capable of instantaneous charging and discharging. The capacitor C is, for example, an electric double layer capacitor. The parallel monitor is connected in parallel with each of the capacitors C to detect and control the charging voltage / current. For example, the charging current of the capacitor C that has reached the full charging voltage is individually bypassed, or the voltage is monitored at an intermediate voltage. When the initialization is performed, the variation between the capacitors C is corrected by bypassing the capacitors C charged to a voltage higher than the initialization level by the initialization signal. The charger 2 is, for example, an AC / DC converter that performs charging by connecting the capacitor power storage device 1 to an input power supply, and can be regarded as a current source when viewed from the capacitor power storage device 1 in order to charge the capacitor power storage device 1 efficiently. The charging is performed by controlling the current as described above. The output control circuit 3 includes, for example, a current pump (switching converter) and a DC / AC inverter for controlling the output current discharged from the capacitor power storage device 1 including the plurality of capacitors C and the parallel monitor.
[0009]
The switching circuit 5 connects the input power supply to the load, and switches the output control circuit 3 to the load when the input power supply fails. Also, the output control circuit 3 is connected to a connection line between the input power supply and the load, and the output of the output control circuit 3 is controlled in accordance with a change in the load to be used as a load leveling device. The power may be switched from the output control circuit 3 to the load to be used as an uninterruptible power supply. In this way, the constant output control circuit 3 is connected between the input power supply and the load, and is used as a load leveling device. When the power is supplied from the output control circuit 3 to the load during a power failure, the switching by the switching circuit 5 is omitted. It may be.
[0010]
The uninterruptible power control circuit 4 monitors the input power supplied to the load, and controls the charger 2, the output control circuit 3, and the switching circuit 5 in response to a change in the load or a power failure. First, the charger 2 is controlled in a steady state to charge the capacitor power storage device 1. When a power outage of the input power supply is detected, the output control circuit 3 and the switching circuit 5 are controlled so that power is supplied from the capacitor power storage device 1. When used as a load leveling device, a transient change in load is detected to control the charger 2, the output control circuit 3, and the switching circuit 5 to control charging and discharging of the capacitor power storage device 1. In this way, the load is leveled.
[0011]
The prediction / diagnosis processing circuit 7 obtains the remaining capacity as a diagnosis, predicts the available backup time, or determines the deterioration of the capacitor, and detects the terminal voltage of the capacitor power storage device 1 and the capacitor detected by the current detection circuit 6. The remaining capacity and the power consumption are obtained based on the output current from the power storage device 1, and the backup available time of the capacitor power storage device 1 is predicted and the self-diagnosis is performed based on the remaining capacity and the power consumption. The prediction / diagnosis output circuit 8 is, for example, a display that outputs a prediction / diagnosis result such as a predicted backup available time and a deterioration state of a capacitor.
[0012]
Deterioration of secondary batteries can occur in various ways, but degradation of electric double-layer capacitors is similar to that of ordinary secondary batteries, such as dendrite shorts and punctures, as long as the maximum charge voltage is limited by a parallel monitor. Less likely in principle. Deterioration in the case of an electric double layer capacitor bank is relatively simple, and can be determined by a decrease in capacitance or an increase in internal resistance. Assuming that the capacitance of the capacitor bank is C and the terminal voltage of the bank is V, the stored energy U is
U = CV²/ 2
Can be represented by When C is obtained from this equation,
C = 2U / V²
By applying the amount of power consumption during a certain period of time and the change in terminal voltage during that period to U and V in the above equation, an equivalent C can be obtained. Therefore, it is possible to compare the obtained C with the previous value, determine whether the difference is within a predetermined limit value or not, and output a warning or an alarm according to the deviation amount. Can be.
[0013]
FIG. 2 is a diagram for explaining an example of a backup available time prediction and a self-diagnosis performed when operating as an uninterruptible power supply. The terminal voltage and the output current are detected and read (step S11). Then, the remaining capacity is obtained from the terminal voltage, the power consumption is obtained from the terminal voltage and the output current (step S12), and the average power consumption for a predetermined period is obtained by combining with the previously obtained value (step S13). Is divided by the average power consumption to predict the backup available time (step S14). Further, self-diagnosis is performed by determining the capacitance from the terminal voltage and the power consumption and determining whether or not the capacitance is within the limit value (step S15). The estimated backup available time and the self-diagnosis result are output on a display screen or the like (step S16).
[0014]
For example, when a data save signal or the like is issued due to a power failure, the current consumption of a load circuit such as a computer is not in a steady state but changes every moment. In such a case, it is possible to periodically update and output the backup available time according to the current consumption that changes every moment by the above-described processing, and it is possible to provide accurate information. In applications where the load is very light or fluctuates, it may not be possible to obtain measurement data with sufficient significant figures. It is also possible to determine whether or not the capacitance of the capacitor bank is within a clean range based on a change in the terminal voltage due to the power consumption during the time discharge. As described above, the deterioration mode of the capacitor includes an increase in the internal resistance. However, depending on the manufacturing method of the capacitor, a decrease in the capacitance is usually detected before the increase in the internal resistance appears. Therefore, it can be said that the determination based on the capacitance is highly accurate as the self-diagnosis information. If the increase in the internal resistance of the capacitor is to be strictly detected, a somewhat large load current is passed using the test load resistance, and the measured value is treated in the same manner as above to reduce the equivalent capacitance. It is possible to substitute for the calculation.
[0015]
As the capacitor power storage device 1, for example, a parallel monitor is connected to a capacitor cell having a withstand voltage of 2 to 3 V, an internal resistance of 2 ΩF, and an energy density of 5 Wh / lit or more, and these are connected in series and parallel so that the required voltage and power are obtained. With this configuration, it is possible to support a short-time charging of a minimum of 30 seconds to 1 minute and a full load of a power failure with a minimum discharge time of 30 seconds or more and a minimum of about 1 minute. Can be realized. Therefore, it is possible to realize a one-minute uninterruptible power supply and a load leveling device that charge when the power supply is normal and discharge when abnormal or necessary. Moreover, there is no need to judge the service life, etc., it is maintenance-free, it is completely sealed, there is no gas leakage, and it is possible to accurately predict the remaining amount from the charging voltage.
[0016]
For example, when a device having a contracted power of 1 kW and a peak load of 2 kW is used, the insufficient power can be supplied from the charged device. Such an application involves a severe charge / discharge cycle in which the battery is discharged every time the peak power is generated and charged in time for the next generation, so that the secondary battery is severely deteriorated and difficult to be put to practical use. However, by using the capacitor power storage device of the present invention, it is possible to cope with a short charge / discharge cycle, and to use the device with high reliability and long life.
[0017]
Next, an example will be described in which the remaining capacity used for estimating the backup available time is obtained. FIG. 3 is a diagram showing a specific configuration example for obtaining the remaining capacity of the capacitor power storage device, where 10 is a fuel gauge, C is a capacitor, R1 to R13 are resistors, X1 and X2 are shunt regulators, and Q1 to Q4 are transistors. Is shown.
[0018]
In FIG. 3A, a capacitor C is a bank (module) in which a plurality of capacitors (cells) are connected in series to form a bank (module) in a capacitor power storage device configured by connecting many capacitors in series and parallel. Are connected in series to form a power supply device, the bank or a single capacitor constituting the bank, and a voltage between terminals is taken out to obtain the remaining capacity of the capacitor power storage device. The fuel gauge 10 is an ammeter having a full scale of 1 mA, for example, which indicates the remaining capacity of a power supply device in which both ends of the capacitor C are connected in series with a polygonal line approximation circuit and a number of capacitors are connected. The shunt regulators X1 and X2 are temperature-compensated active Zeners, and constitute an approximation circuit for performing a polygonal line approximation together with the resistors R1 to R5. The shunt regulator X1 operates as a comparator by connecting a voltage dividing circuit composed of resistors R1 and R2 to a control input, and turns on when the voltage of the control input reaches a predetermined voltage (bending point) (for example, manufactured by TI Corporation). TL431, NEC's C1944, etc.). Therefore, the circuit composed of the shunt regulator X1 and the resistors R1 and R2 is a constant voltage limiting variable resistor circuit having a constant resistance at a so-called low voltage and operating at a constant voltage at a preset voltage, and the resistor 5 has a constant voltage limiting variable. This is the load resistance connected to the resistance circuit.
[0019]
The transistors Q1 and Q2 are high breakdown voltage transistors that form a voltage dividing circuit together with the resistors R6 to R8. If the withstand voltage exceeds the maximum rating of the shunt regulator, transistors Q1 and Q2 with high withstand voltage are used. In this method, a voltage follower (emitter follower) is formed by using the β of a transistor, and an active voltage dividing circuit with low power consumption is formed. For example, a voltage follower using a fuel gauge for a full charge voltage of 10 V is used. It can be applied to any voltage of 10 V or more only by adjusting the voltage dividing resistance before the above and without re-adjusting the bending point. In other words, if the voltage dividing resistor is simply placed before the broken line approximation circuit, the bending point will be out of order and recalculation and significant re-adjustment will be required, but if a voltage follower is connected before, the output impedance will be low Therefore, even if an arbitrary voltage dividing resistor is connected before the element, the characteristic of the approximation of the broken line is not deviated, and the design and adjustment become easy.
[0020]
In the case of a transistor having a small β, a Darlington connection of transistors Q3 and Q4 may be used as shown in FIG. That is, depending on the required accuracy, voltage range, and transistor to be used, one transistor, a series-connected transistor as shown in FIG. 3A, and a Darlington-connected transistor as shown in FIG. Needless to say, Further, the broken line approximation circuit may be configured by connecting shunt regulators X1 and X2 in parallel as shown in FIG.
[0021]
4 is a diagram showing an example of a circuit configuration of the high-voltage shunt regulator, FIG. 5 is a diagram showing characteristics of the high-voltage shunt regulator shown in FIG. 4, and FIG. 6 is a diagram showing characteristics of the broken line approximation circuit shown in FIG.
[0022]
A high-voltage shunt regulator shown in FIG. 4 shows a configuration example of a shunt regulator of about 100 V using a reference voltage of 2.5 V. In the circuit shown in FIG. 4, since the voltage dividing point 3 is divided by a factor of four by the resistors R1 to R3, the voltage of the Darlington-connected transistors Q1 and Q2 becomes 25V when the collector side is about 100V. , The control input of the shunt regulator X1 is further reduced to one tenth of 2.5V. Since the shunt regulator X1 operates at this voltage, the collector potentials of the transistors Q1 and Q2 (▽, Δ) and the emitter potentials of the transistor Q2 (□, ◇) as shown in FIG. The voltage of the shunt regulator X1 is maintained at 25V. Accordingly, the current (solid □, Δ) flowing through the resistor R4 increases in proportion to the increase in the remaining capacity of the capacitor and the capacitor voltage.
[0023]
FIG. 3 shows an example in which another part corresponding to X1, R1, and R2 in FIG. 4 having the above-mentioned polygonal line approximation characteristic is added in series, and two bent parts are provided. By calculating the constant according to the above and fine adjustment corresponding to the variation of the Zener voltage, as shown in FIG. 6, an extremely good polygonal line approximation characteristic (filled square) with respect to the characteristic (filled square) of the capacitor can be obtained. In the circuit shown in FIG. 3A, a current supply element for giving a characteristic includes: (1) R5 for giving a current after a bending point; and (2) a block for X1, R1, R2 for determining a current before that. Two of the blocks X2, R3, and R4 are in series, and three blocks are in series in total with (1).
[0024]
Similar characteristics can be obtained by connecting these blocks in parallel as shown in FIG. The circuit design is easier in the parallel type, because the mutual interference is smaller, but the number of components such as the resistors R11 to R13 serving as loads is somewhat increased depending on the design value, and the current consumption increases.
[0025]
The remaining capacity detection circuit can be similarly applied to a capacitor power storage device that performs bank switching. Hereinafter, an example in which the present invention is applied to a capacitor power storage device that performs bank switching will be described. When bank switching is performed, the terminal voltage of the capacitor causes each bank to behave differently. Therefore, in general, fuel gauges are provided in all capacitor banks, and the sum of the fuel gauges allows the remaining capacity of all capacitors of the power storage device to be known.
[0026]
However, in the capacitor storage device of the bank switching, when attention is paid to a specific capacitor or a capacitor bank, there is a certain relationship between the voltage between terminals and the storage amount. A simple fuel gauge can be obtained by fitting the relationship with a line approximation circuit. This method does not measure the remaining capacity of all the capacitors, but estimates the total storage capacity only from the target bank. In each case, the calculation is performed assuming that the capacitance of the capacitor is constant. Therefore, the present method in which the capacitance of each bank is assumed to be constant has no problem in practicality.
[0027]
7 is a diagram showing a configuration example of a series-parallel bank switching type capacitor power supply device, FIG. 8 is a diagram showing discharge characteristics of the power supply device shown in FIG. 7, and FIG. 9 is a diagram showing the voltage and storage of the capacitor power supply device shown in FIG. FIG. 10 is a diagram showing the relationship between the amount (remaining capacity) and the amount (remaining capacity). FIG. 10 is a diagram showing a configuration example of a capacitor power supply device of a shift type bank switching type. FIG. 12 is a diagram showing a configuration example of a tapped bank switching type capacitor power supply device, and FIG. 13 is a diagram showing a relationship between the voltage and the amount of stored power (remaining capacity) of the capacitor power supply device shown in FIG. FIG.
[0028]
In the series-parallel bank switching type capacitor power supply device shown in FIG. 7, for example, the capacitors C1, C2 and C11, C12 are connected in parallel by the parallel connection switches Sp1, Sp2, Sp11, Sp12 when the battery is fully charged, and the capacitors C1, C11 are connected. The voltage between the terminals is monitored, and when the voltage decreases with the discharge, the connection is sequentially switched to the parallel connection to reduce the fluctuation range of the output voltage out. In the case of charging, the reverse control may be performed. . In the series-parallel switching control, for example, when the voltage of each of the capacitors C1, C2, C11, and C12 at the time of full charge is 30V as shown in FIG. 8, the voltage at the output terminal starts discharging from 60V and drops to 40V. First, the parallel connection of the capacitors C1 and C2 is switched to the series connection by the series connection switch Ss1. As a result, when the output voltage is increased to the same voltage of 60 V as at the time of full charge, and further reduced to around 40 V by discharging, the parallel connection of the capacitors C11 and C12 is switched to the serial connection by the remaining series connection switch Ss11. The change in the voltage at the output terminal (point 11 in FIG. 7) by such control is indicated by □ in FIG. 8, the change in the voltage of the capacitor C1 (point 3 in FIG. 7) is indicated by Δ in FIG. The voltage change between points 13 and 1) is indicated by Δ in FIG. 8 and the discharge amount is indicated by □ (solid). Therefore, when the relationship between the voltage of the capacitor C1 (point 3 in FIG. 7) and the amount of stored power is shown based on the characteristics shown in FIG. 8, the characteristics are shown as □ in FIG. If this is approximated by a polygonal line, it can be set with a high degree of accuracy, for example, by a polygonal line having two bending points （(filled) shown by a dashed line in FIG.
[0029]
The shift type bank switching type capacitor power supply device shown in FIG. 10 is also called a stagger type, and when fully charged, a series circuit of capacitors C1 and C2 and a series circuit of capacitors C3 and C4 are connected in parallel as shown in FIG. Then, as the voltage decreases, first, as shown in (c), switching is performed so that the capacitors C1 and C4 are connected in series to the parallel circuit of the capacitors C2 and C3. Then, as shown in (d), all the capacitors C1 and C4 are switched. , C2, C3, and C4 are switched to be connected in series. The change in the output voltage associated with this switching is indicated by the □ (solid) line in FIG. 11, and the charge storage amount corresponding to the voltage of the capacitor C1 is indicated by the □ line in FIG. is there. In this case as well, when approximation is made by a polygonal line, for example, a polygonal line having two bending points ○ (filled) shown by a chain line in FIG.
[0030]
The tap-type bank switching type capacitor power supply device shown in FIG. 12 is based on the capacitors C1 to C3, and assists (adjusts) the capacitors C4 and C5, and assists the capacitors C1 to C3 as the voltage decreases. Of the capacitors C4 and C5 are connected one by one in a stepwise manner. In this system, it is possible to accurately measure the remaining capacity based on the terminal voltages of the base capacitors C1 to C3 that are not switched. When the capacitor C1 is relatively small, the nonlinearity becomes remarkable. Therefore, the capacitors C2 and C3 are omitted, the three capacitors C1, C4 and C5 are used, and the terminal voltage V (1) of the capacitor C1 is X. FIG. 13 shows the result of calculating the ratio of the sum of the charged amounts of all the capacitors to the fully charged amount with respect to the axis. In this case as well, when approximation is made with a polygonal line, for example, a polygonal line having a bending point ○ (filled) shown by a dashed line in FIG.
[0031]
Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-described embodiment, the uninterruptible power supply that detects a power failure of the input power supply and discharges from the capacitor power storage device 1 is used. However, in a portable electronic device, a conventional battery power supply that is used separately from a commercial AC power supply is used. Needless to say, it may be used as a power supply instead of the power supply, or may be used as an uninterruptible power supply for large power. In addition, the input power supply is connected to the capacitor power storage device through the charger, and the load is connected through the output control circuit, but the power supply line between the input power supply and the load is connected through the AC / DC converter, and the AC / DC converter is used reversibly. You may do so. In short, any configuration may be used as long as any one of these means can be used to switch and connect the capacitor power storage device to the input power supply and the load via the charge / discharge control means. Further, in the measurement of the remaining capacity, examples in which the present invention is applied to three typical types of bank switching methods are given. Through these various examples, attention is paid to a specific capacitor bank in a system in which bank switching is performed. It is clear that a simple and sufficiently accurate fuel gauge can be obtained by examining the relationship between the voltage and the energy storage amount of the entire system and approximating the broken line using the circuit of the present invention. Although the shunt regulator is used as the polygonal line approximation circuit, it goes without saying that it may be replaced with a non-linear resistance element including a zener diode and other constant voltage control circuits.
[0032]
【The invention's effect】
As is apparent from the above description, according to the present invention, a capacitor power storage device having a plurality of capacitors and a parallel monitor connected in parallel to each of the capacitors to detect and control the charging voltage and current is provided by an input power supply. Of the capacitor uninterruptible power supply unit that switches and connects to the load and the charge and discharge control means for charging and discharging, detects the voltage and output current of the capacitor power storage device, obtains the remaining capacity and power consumption, predicts the operable time, and Since the diagnostic means for determining the deterioration of the capacitor is provided and the prediction of the operable time and the determination of the deterioration of the capacitor are output, the diagnosis information can be provided simply and accurately. Moreover, the diagnostic means predicts the backup available time based on the remaining capacity and the average power consumption during the predetermined time and displays the backup available time, and the diagnostic means obtains the decrease in the capacitance based on the change in the remaining capacity and the voltage. Diagnosis of deterioration of the capacitor is performed, and the diagnostic means extracts a terminal voltage of at least one of the plurality of capacitors and connects a load resistance element in series to a circuit including one or more non-linear resistance elements as a circuit for obtaining a remaining capacity. Since the remaining capacity is obtained by detecting the current flowing through the load resistance element and approximating the broken line, the change over time in the remaining capacity and the load current is measured, and the accurate backup available time according to the load state is predicted. Thus, deterioration of the capacitor can be diagnosed, and the reliability can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a capacitor uninterruptible power supply according to the present invention.
FIG. 2 is a diagram for explaining an example of prediction of a backup available time and self-diagnosis performed during operation as an uninterruptible power supply.
FIG. 3 is a diagram illustrating a specific configuration example for obtaining a remaining capacity of a capacitor power storage device.
FIG. 4 is a diagram illustrating a circuit configuration example of a high-voltage shunt regulator.
FIG. 5 is a diagram showing characteristics of the high-voltage shunt regulator shown in FIG. 4;
FIG. 6 is a diagram showing characteristics of the polygonal line approximation circuit shown in FIG. 3;
FIG. 7 is a diagram showing a configuration example of a series / parallel bank switching type capacitor power supply device.
8 is a diagram showing discharge characteristics of the power supply device shown in FIG.
9 is a diagram showing a relationship between a voltage of the capacitor power supply device shown in FIG. 7 and a charged amount (remaining capacity).
FIG. 10 is a diagram showing a configuration example of a shift type bank switching type capacitor power supply device.
11 is a diagram showing a relationship between a voltage of the capacitor power supply device shown in FIG. 10 and a charged amount (remaining capacity).
FIG. 12 is a diagram showing a configuration example of a tap type bank switching type capacitor power supply device.
13 is a diagram showing a relationship between a voltage of the capacitor power supply device shown in FIG. 12 and a charged amount (remaining capacity).
[Explanation of symbols]
REFERENCE SIGNS LIST 1 capacitor storage device 2 charger 3 output control circuit 4 uninterruptible control circuit 5 switching circuit 6 current detection circuit 7 prediction / diagnosis processing circuit 8 prediction / diagnosis output circuit , 9 ... Parallel monitor, C ... Capacitor

Claims (3)

A capacitor storage device having a plurality of capacitors and a parallel monitor connected in parallel to each of the capacitors to detect and control a charging voltage / current is connected to an input power source and a load via charge / discharge control means, and is charged and discharged. In the capacitor uninterruptible power supply to perform, the voltage and output current of the capacitor power storage device is detected, the remaining capacity is obtained based on the capacitance of the capacitor power storage device and the detected voltage, and based on the detected voltage and output current. The power consumption is calculated, the operable time is predicted based on the obtained remaining capacity and the power consumption, and the decrease in the capacitance is calculated based on the amount of the calculated power consumption in a certain time and the change in the voltage detected during the time. Capacity, characterized in that it comprises a diagnostic means for determining deterioration of the capacitor, and outputs the determination uptime projections and capacitor degradation seeking Uninterruptible power supply. 2. The capacitor uninterruptible power supply according to claim 1, wherein the diagnosis unit predicts and displays a backup available time based on the remaining capacity and an average power consumption during a predetermined time. 2. The capacitor uninterruptible power supply according to claim 1, wherein the diagnosis unit determines a decrease in capacitance based on the change in the remaining capacity and the voltage and diagnoses deterioration of the capacitor.

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