JP2008148495A - System, method and program for power failure, and uninterruptible power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system, method and program for power failure, and an uninterruptible power supply, capable of decreasing a power failure detection value to a limit thereof according to a load current at that moment. <P>SOLUTION: This system includes a power conversion circuit 210 for supplying electric power of a commercial power supply 100 to a load 400; load current value measurement means 340; power failure detection value calculation means 330 for calculating a power failure detection value based on a load current value; and power failure detection means 320 for monitoring a voltage value of the commercial power supply 100 based on the power failure detection value and detecting power failure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power failure detection system, a power failure detection method, a power failure detection program, and an uninterruptible power supply, and in particular, a power failure detection system, a power failure detection method, a power failure detection program, and a power failure detection system for controlling a power failure detection threshold according to a load current. The invention relates to an uninterruptible power supply.

  As a conventional technique, as shown in FIG. 14, there is an uninterruptible power supply device having an AC power source 1, a converter 2, an inverter 3, a load 6, a storage battery 7, a thyristor 8, and a power failure detection circuit 9. .

  The conventional uninterruptible power supply having such a configuration operates as follows. The power failure detection circuit 9 constantly compares the input voltage value from the AC power supply 1 with the power failure detection value that is a threshold value of the voltage to be detected as a power failure. And when it detects that the said input voltage value is less than the said power failure detection value, the thyristor 8 is controlled and the output of the storage battery 7 is supplied to the inverter 3. FIG. Thus, the conventional uninterruptible power supply shown in FIG. 14 is switched to the storage battery drive operation. There is an uninterruptible power supply configured as described above and capable of continuing the supply of power even during a power failure (for example, Patent Document 1).

JP-A-3-56047

  However, the power failure detection value in these conventional uninterruptible power supply devices is a value set in advance based on the maximum current consumption when a rated load is connected.

  Therefore, when the fluctuation of the input voltage value is large and frequently occurs, a power failure is frequently detected by comparing the power failure detection value with the input voltage value, and the battery driving operation is frequently switched. For this reason, there are cases where the storage battery 7 is repeatedly discharged and does not become fully charged. This is the same even when the required output voltage and output current can be maintained even if the input voltage drops to a certain value because the load current is small. That is, in the conventional uninterruptible power supply, since a fixed value based on the maximum current consumption when a rated load is connected is used as the power failure detection value, the load current is small. Regardless, there are cases where the storage battery 7 repeatedly discharges due to unnecessary switching to the storage battery drive operation and does not become fully charged, and when a power outage occurs in which the input voltage is 0 V for a long time, the expected backup There was a problem of not getting time.

  On the other hand, in fluorescent lamps and the like, power-saving devices that reduce power consumption by stepping down the voltage are widely used. In addition, devices with severe load fluctuations such as laser printers are also widespread. Frequent input voltage fluctuations occur due to the step-down operation of these power-saving devices or the operation of devices with severe load fluctuations. For this reason, the conventional uninterruptible power supply apparatus 200 sometimes detects an occurrence of an unnecessary power failure and falls into a situation where it frequently switches to a storage battery operation.

  An object of the present invention is to provide a power failure detection system, a power failure detection method, a power failure detection program, and an uninterruptible power supply device that can lower the power failure detection value to the limit according to the load current at that time. There is.

  The first power failure detection system of the present invention has power failure detection value calculation means for calculating a power failure detection value based on a load current value.

  The second power failure detection system of the present invention includes a means for measuring a load current value, a power failure detection value calculating means for calculating a power failure detection value based on the load current value, a means for monitoring an input voltage value, Means for comparing a power failure detection value with the input voltage value and power failure notification means for notifying a power failure based on the comparison result.

  A third power failure detection system according to the present invention includes means for sequentially measuring a load current value, power failure detection value calculating means for sequentially calculating a power failure detection value based on the load current value, and means for monitoring an input voltage value. The power failure detection value and the input voltage value are compared with each other, and the power failure notification unit notifies the power failure based on the comparison result.

  According to a fourth power failure detection system of the present invention, in the second or third power failure detection system, the power failure detection value calculation means calculates a plurality of types of power failure detection values for each load current value. And the said power failure notification means notifies a power failure in the format which can identify the several types of said power failure detection value.

  In the fifth power failure detection system of the present invention, in the second, third, or fourth power failure detection system, the power failure notification means notifies the load current value together.

  In the sixth power failure detection system of the present invention, in the second, third, fourth, or fifth power failure detection system, the power failure notification means notifies the input voltage value together.

  The seventh power failure detection system of the present invention is the second, third, fourth, fifth, or sixth power failure detection system, wherein the power failure notification means notifies the power failure detection value together. To do.

  The eighth power failure detection system according to the present invention is the first, second, third, fourth, fifth, sixth, seventh, or eighth power failure detection system, wherein the power failure detection value is calculated. The means uses the maximum value of the load current value within a predetermined time as the load current value.

  According to a ninth power failure detection system of the present invention, in the first, second, third, fourth, fifth, sixth, seventh, or eighth power failure detection system, the power failure detection value is calculated. The means has a table storing the power failure detection value corresponding to the load current value.

  The first uninterruptible power supply of the present invention is described in claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, or claim 9. The power failure detected by the power failure detection system is notified and the unit switches to storage battery operation.

  In the first power failure detection method of the present invention, the processing device calculates a power failure detection value based on the load current value.

  In the second power failure detection method of the present invention, the processing device measures a load current value, calculates a power failure detection value based on the load current value, monitors an input voltage value, and detects the power failure detection value and the input. A voltage value is compared and a power failure is notified based on the comparison result.

  In the third power failure detection method of the present invention, the processing device sequentially measures the load current value, sequentially calculates the power failure detection value based on the load current value, monitors the input voltage value, The input voltage values are compared, and a power failure is notified based on the comparison result.

  According to a fourth power failure detection method of the present invention, in the second or third power failure detection method, the processing device calculates a plurality of types of power failure detection values for each load current value. The power failure is notified in a format that can identify the type of power failure detection value.

  According to a fifth power failure detection method of the present invention, in the second, third, or fourth power failure detection method, the processing device notifies the load current value together.

  In the sixth power failure detection method of the present invention, in the second, third, fourth, or fifth power failure detection method, the processing device notifies the input voltage value together.

  According to a seventh power failure detection method of the present invention, in the second, third, fourth, fifth, or sixth power failure detection method, the processing device notifies the power failure detection value together.

  According to an eighth power failure detection method of the present invention, in the first, second, third, fourth, fifth, sixth, seventh, or eighth power failure detection method, a processing device is preliminarily provided. A maximum value of the load current value within a predetermined time period is used as the load current value.

  According to a ninth power failure detection method of the present invention, in the first, second, third, fourth, fifth, sixth, seventh, or eighth power failure detection method, a processing device includes: A table storing the power failure detection value corresponding to the load current value;

  The second uninterruptible power supply of the present invention is described in claim 11, claim 12, claim 13, claim 14, claim 15, claim 16, claim 17, claim 18, or claim 19. The power failure detected by the power failure detection method is notified and the unit switches to storage battery operation.

  The first power failure detection program of the present invention causes the processing device to perform a process of calculating a power failure detection value based on the load current value.

  The second power failure detection program of the present invention measures a load current value in a processing device, calculates a power failure detection value based on the load current value, monitors an input voltage value, and detects the power failure detection value and the input. The voltage values are compared, and a process for notifying a power failure is performed based on the comparison result.

  The third power failure detection program of the present invention sequentially measures the load current value in the processing device, sequentially calculates the power failure detection value based on the load current value, monitors the input voltage value, The said input voltage value is compared and the process which notifies a power failure based on the said comparison result is performed.

  According to a fourth power failure detection program of the present invention, in the second or third power failure detection program, the processing device calculates a plurality of types of power failure detection values for each load current value. A process of notifying a power failure in a format that can identify the type of power failure detection value is performed.

  The fifth power failure detection program of the present invention causes the processing device to perform processing for notifying the load current value together in the second, third, or fourth power failure detection program.

  According to a sixth power failure detection program of the present invention, in the second, third, fourth, or fifth power failure detection program, the processing device performs a process of notifying the input voltage value together. .

  The seventh power failure detection program according to the present invention is a process of notifying the processing device together with the power failure detection value in the second, third, fourth, fifth, or sixth power failure detection program. To do.

  In the eighth power failure detection program of the present invention, in the first, second, third, fourth, fifth, sixth, seventh, or eighth power failure detection program, the processor is preliminarily provided. A process of using the maximum value of the load current value within a predetermined time as the load current value is performed.

  According to a ninth power failure detection program of the present invention, in the first, second, third, fourth, fifth, sixth, seventh, or eighth power failure detection program, a processing device includes: A table storing the power failure detection value corresponding to the load current value;

  The third uninterruptible power supply of the present invention is described in claim 21, claim 22, claim 23, claim 24, claim 25, claim 26, claim 27, claim 28, or claim 29. Is notified of a power failure detected by the power failure detection program, and switches to storage battery operation.

  According to the present invention, it is possible to prevent detection of an unnecessary power failure even in an environment where the fluctuation of the input voltage is severe. The reason is that, even when the voltage of the input power supply fluctuates, the power failure detection value can be lowered according to the load current at that time.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  Referring to FIG. 1, the first embodiment of the present invention includes a commercial power supply 100, an uninterruptible power supply 300, and a load 400.

  The uninterruptible power supply 300 includes a power conversion circuit 210, a power failure detection means 320, a power failure detection value calculation means 330, and a load current value measurement means 340.

  The power conversion circuit 210 includes a rectifier 201, an inverter 202, a switch 203, a charger 204, and a storage battery 205.

  The uninterruptible power supply 300 receives commercial AC power output from the commercial power supply 100, converts the commercial AC power into converted AC power, and outputs the converted AC power to the load 400. In this specification, a general commercial power source is used, but a private power source or other power source may be used.

  The load 400 receives the converted AC power output from the uninterruptible power supply 300, and receives supply of power as required to increase or decrease due to internal operation.

  The power conversion circuit 210 receives the commercial AC power output from the commercial power source 100, converts the commercial AC power into DC power by the rectifier 201, and supplies the DC power to the inverter 202. The switch 203 supplies the output power of the storage battery 205 to the inverter 202 according to an instruction from the power failure detection means 320. The inverter 202 converts the DC power or the output power from the storage battery 205 into AC power and outputs the AC power as the converted AC power. The charger 204 supplies a charging current for charging the storage battery 205. In addition, although the power conversion circuit 210 shown in this specification uses the thing of the basic form integrated in the uninterruptible power supply 300, it may be an independent apparatus and is integrated in load. May be present, a plurality of devices may be present, or may have additional functions not shown in this specification.

  The power failure detection means 320 monitors the input voltage value of the input power output from the commercial power supply 100 and input to the power conversion circuit 210 of the uninterruptible power supply 300. Then, the power failure detection means 320 compares the power failure detection value input from the power failure detection value calculation means 330 with the input voltage value. And when the power failure detection means 320 detects that the input voltage value is lower than the power failure detection value, the power failure detection means 320 turns on the power failure signal. Further, when detecting that the input voltage value is not lower than the power failure detection value, the power failure detection means 320 turns off the power failure signal and notifies the power conversion circuit 210 of the power failure state. . The power failure detection means 320 may be realized by hardware or a program controlled by a microcomputer. Since these realization methods are well-known techniques including a physical sensor part for power failure detection, a detailed description is not described in this specification.

  The power failure detection value calculation means 330 receives the load current value from the load current value measurement means 340, calculates the power failure detection value corresponding to the load current value, and outputs it to the power failure detection means 320. The power failure detection value calculation means 330 may be realized by hardware or a microcomputer control program.

  The load current value measuring unit 340 measures the load current value and outputs the load current value to the power failure detection value calculating unit 330. The load current value measuring means 340 may be realized by hardware or a microcomputer-controlled program. Since these realization methods are well-known techniques including a physical sensor part for current value measurement, a detailed description is not described in this specification.

  Next, the operation of the first exemplary embodiment of the present invention will be described in detail with specific examples.

  In this embodiment, it is assumed that the maximum rated current of the load 400 is “15 [A (ampere)]”. Further, it is assumed that the voltage of the commercial power supply 100 is “100 [V (volt)]”.

  FIG. 2 is a diagram illustrating a storage image of the table 331 in which the correspondence between the load current value and the power failure detection value that the power failure detection value calculation unit 330 has is stored.

  First, an example of the operation when the input voltage value decreases and a power failure notification occurs will be described. At a certain point in time, the load current value measuring unit 340 measures that the load current value is “13 [A]”, and outputs this to the power failure detection value calculating unit 330 (step S501). The power failure detection value calculation means 330 calculates the power failure detection value “73 [V]” from the input load current value “13 [A]” with reference to the table 331 shown in FIG. It outputs to the detection means 320 (step S502).

  The power failure detection means 320 measures that the input voltage value is “70 [V]” (step S503). Then, the power failure detection means 320 compares the power failure detection value “73 [V]” with the input voltage value “70 [V]” and detects that the input voltage value is lower than the power failure detection value. (Step S504). Then, the power failure detection means 320 turns on the power failure signal (step S505).

  Next, an example of the operation when the input voltage value has decreased but no power failure notification has occurred will be described. At a certain point in time, the load current value measuring unit 340 measures that the load current value is “12 [A]”, and outputs this to the power failure detection value calculating unit 330 (step S501). The power failure detection value calculation means 330 calculates the power failure detection value “67 [V]” from the input load current value “12 [A]” with reference to the table 331 shown in FIG. It outputs to the detection means 320 (step S502).

  The power failure detection means 320 measures that the input voltage value is “70 [V]” (step S503). Then, the power failure detection means 320 compares the power failure detection value “67 [V]” with the input voltage value “70 [V]” and detects that the input voltage value is not lower than the power failure detection value. (Step S504). Then, the power failure detection means 320 turns off the power failure signal (step S506).

  In this embodiment, the processing from step S501 to step S505 or step S506 is always repeated.

  Thus, in this embodiment, the input voltage value is compared with the power failure detection value, and the power conversion circuit 210 is notified by the power failure signal whether the input voltage value is lower than the power failure detection value. . When the power failure signal is on, the switch 203 of the power conversion circuit 210 supplies the sum of the output power of the storage battery 205 and the DC power output from the rectifier 201 to the inverter 202, and the power failure signal is off. Supplies the DC power output of the rectifier 201 to the inverter 202.

  According to the first embodiment of the present invention, when the power failure detection value corresponding to the load current value is preset, the power failure detection value is high when the load current value is large, and the load current is small. Is able to detect a power outage with the low power outage detection value, and even in an environment where frequent fluctuations in the commercial power supply 100 occur, the storage battery drive operation is suppressed, the number of discharges of the storage battery 205 is suppressed, This has the effect that it is possible to secure the expected backup time in the event of a long power failure.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

  Referring to FIG. 4, the second embodiment of the present invention includes a measuring unit 501, an output device 502, a processing device 510, and a storage device 520.

  The processing device 510 includes a monitoring unit 511, a measuring unit 512, a calculating unit 513, a comparing unit 514, and a notifying unit 515. The storage device 520 includes an input voltage value storage unit 521, a load current value storage unit 522, a load current maximum value storage unit 523, a table storage unit 524, a power failure detection value storage unit 525, and a power failure state storage unit 527.

  FIG. 5 shows a storage image of the input voltage value storage unit 521. FIG. 6 shows a storage image of the load current value storage unit 522. The load current value storage unit 522 includes a ring buffer capable of storing a plurality of load current values, writes the load current value at an address pointed by a pointer (not shown), and updates the pointer after writing. FIG. 7 shows an image stored in the table storage unit 524. FIG. 8 shows a stored image of the power failure detection value storage unit 525. FIG. 9 shows an image stored in the power failure state storage unit 527. FIG. 10 shows a storage image of the load current maximum value storage unit 523.

  In the following description, the power failure A indicates the state of the input voltage value that cannot supply the power required by the load (not shown), and the power failure B is reduced but the load (not shown). In this case, it is possible to supply the power necessary for the input voltage value.

  The measuring unit 501 measures the input voltage value and outputs it to the monitoring unit 511. The measuring unit 501 measures the load current value consumed by a load (not shown) and outputs it to the measuring unit 512.

  The monitoring unit 511 inputs the input voltage value and stores it in the input voltage value storage unit 521 shown in FIG.

  The measuring means 512 receives the load current value and stores it in the load current value storage unit 522 shown in FIG.

  The calculation means 513 reads the maximum load current value from the load current value storage unit 522, refers to the table storage unit 524 shown in FIG. 7, and detects the power failure A detection value corresponding to the load current value and the power failure B. Read the detected value. And the calculation means 513 stores the said power failure A detection value and the said power failure B detection value in the power failure detection value memory | storage part 525 shown in FIG. Further, the calculation means 513 stores the load current value in the load current maximum value storage unit 523 shown in FIG.

  Comparing means 514 includes the input voltage value read from the input voltage value storage unit 521 shown in FIG. 5, the power failure A detection value read from the power failure detection value storage unit 525 shown in FIG. 8, and the power failure B detection value. And the power failure information in the power failure A state, the power failure B state, or the non-power failure state is obtained.

  And the comparison means 514 is the case where the power failure A state is obtained as the power failure information, and if the power failure state of the power failure state storage unit 527 shown in FIG. If the power failure is in the power failure B state, a power failure A state occurrence is output to the notification means 515, and if the power failure state is a non-power failure state, a power failure A state occurrence is output to the notification means 515.

  Further, the comparison means 514 is the case where the power failure B state is obtained as the power failure information, and if the power failure state of the power failure state storage unit 527 shown in FIG. If the power failure state is a power failure B state, nothing is done. If the power failure state is a non-power failure state, a power failure B state occurrence is output to the notification means 515.

  Moreover, the comparison means 514 is the case where the non-power failure state is obtained as the power failure information, and if the power failure state of the power failure state storage unit 527 shown in FIG. If the power failure state is a power failure B state, a power failure state release is output to the notification means 515, and if the power failure state is a non-power failure state, nothing is done.

  Moreover, the comparison means 514 stores the power outage information as the power outage state in the power outage state storage unit 527 shown in FIG.

  When the power failure A state occurrence, the power failure B state occurrence, or the power failure state cancellation is input from the comparison unit 514, the notification unit 515 inputs the input voltage value storage unit 521 shown in FIG. 5 and the power failure detection value storage shown in FIG. The power failure A notification, power failure B notification, or power failure release notification shown in FIG. 11 is generated with reference to the unit 525 and the load current maximum value storage unit 523 shown in FIG.

  When the output device 502 receives the power outage A notification, the power outage B notification, or the power outage release notification, the output device 502 transmits it to a power conversion circuit (not shown), displays it on a display (not shown), and displays a maintenance terminal (not shown). ), To a device (not shown) constituting the load, or to means (not shown) for notifying the operator.

  Next, the operation of the second exemplary embodiment of the present invention will be described in detail by showing a specific example. Hereinafter, as an example, a case where the power failure B state transitions to the power failure A state will be described.

  FIG. 12 is a flowchart showing the operation of the measuring means 512 in the processing device 510 according to the second embodiment of the present invention.

  The measuring means 512 receives the load current value from the measuring means 501 and stores it in the load current value storage unit 522 shown in FIG. 6 (step S601). The measuring means 512 repeats the processing shown in the flow of FIG. 12 in response to an interval timer (not shown) or an interrupt (not shown) from the measuring means 501 asynchronously with other means.

  FIG. 13 is a flowchart showing the overall operation of the processing apparatus 510 according to the second embodiment of the present invention.

  The monitoring unit 511 inputs the input voltage value “80” from the measurement unit 501 and stores it in the input voltage value storage unit 521 shown in FIG. 5 (step S610). The process of step S610 of the monitoring unit 511 starts when triggered by an interval timer (not shown) or an interrupt (not shown) from the measuring unit 501.

  The calculating means 513 reads the maximum load current value “14” from the load current value storage unit 522 and stores it in the load current maximum value storage unit 523 shown in FIG. 10 (step S611). Next, the calculation means 513 reads the power failure A detection value “81” and the power failure B detection value “86” corresponding to the load current value “14” with reference to the table storage unit 524 shown in FIG. . Then, the calculation means 513 stores the power failure A detection value “81” and the power failure B detection value “86” in the power failure detection value storage unit 525 shown in FIG. 8 (step S612).

  The comparison means 514 includes the input voltage value “80” read from the input voltage value storage unit 521 shown in FIG. 5, the power failure A detection value “81” read from the power failure detection value storage unit 525 shown in FIG. The power failure B detection value “86” is compared. Then, the comparison means 514 obtains the power failure information of “power failure A state” because the input voltage value is less than or equal to the power failure A detection value. Moreover, the comparison means 514 obtains the power failure information of “power failure B state” when the input voltage value exceeds the power failure A detection value and is equal to or lower than the power failure detection value B. Further, the comparison means 514 obtains the power failure information of “non-power failure state” when the input voltage value exceeds the power failure B detection value. (Step S613).

  Next, since the comparison unit 514 has obtained the “power failure A state” as the power failure information, the process proceeds to step S616, and referring to the power failure state in the power failure state storage unit 527 shown in FIG. “Power outage A state occurrence” is output to the notification means 515, and “power outage A state” is stored in the power outage state storage unit 527 (step S616).

  When the comparison unit 514 obtains the “power failure B state” as the power failure information, the comparison unit 514 proceeds to step S615 and executes a corresponding operation with reference to the power failure state of the power failure state storage unit 527 shown in FIG. 9 (step S615). .

  When the comparison means 514 obtains the “non-power failure state” as the power failure information, the comparison unit 514 proceeds to step S614 and executes a corresponding operation with reference to the power failure state of the power failure state storage unit 527 shown in FIG. 9 (step S614). .

  The notifying unit 515 inputs “occurrence of power outage A state” from the comparing unit 514, the input voltage value “80” of the input voltage value storage unit 521 shown in FIG. 5, and the power outage of the power outage detection value storage unit 525 shown in FIG. The power failure A notification shown in FIG. 11 is generated with reference to the A detection value “81”, the power failure B detection value “86”, and the load current maximum value “14” of the load current maximum value storage unit 523 shown in FIG. And output to the output device 502 (step 619).

  When the notification means 515 inputs “occurrence of power failure B state” from the comparison means 514, it generates a corresponding power failure B notification and outputs it to the output device 502 (step 618).

  When the notification unit 515 receives “power failure state cancellation” from the comparison unit 514, the notification unit 515 generates a corresponding power failure cancellation notification and outputs it to the output device 502 (step 617).

  According to the second embodiment of the present invention, the power failure detection value is calculated by using the maximum value of the load current value within a predetermined time, and the power failure B detection value corresponding to the preliminary warning is also obtained. Thus, even if a sudden change in the input voltage value or the load current value occurs, it can be ensured that the operation is surely switched to the storage battery operation.

  Furthermore, according to the second embodiment of the present invention, the load current value, the power failure detection value, and the input voltage value are notified in accordance with the power failure state, so that the device group and environment of the load are notified. It is possible to analyze this problem.

  Next, a third embodiment of the present invention will be described in detail with reference to the drawings. In the third embodiment, the uninterruptible power supply 300 having the configuration shown in the block diagram of FIG. 1 or the processing device 510 having the configuration of the block diagram shown in FIG. 4 and the uninterruptible power supply 300 or the processing device 510 is shown. Has a program (not shown) that causes the processing to be performed.

  The program realizes the functions described using the flowcharts of FIGS. 3, 12, and 13 in the first and second embodiments of the present invention.

  The program is stored in a storage unit (not shown), and is read and executed by the uninterruptible power supply 300 or the processing device 510 to control the operation of the uninterruptible power supply 300 or the processing device 510. The uninterruptible power supply 300 or the processing device 510 is the same as the processing of the uninterruptible power supply 300 or the processing device 510 in the first embodiment or the second embodiment under the control of the program. Execute.

  According to the third embodiment of the present invention, the processing is executed by the cooperation of hardware and software, so that it is easy to realize.

  The present invention can be applied to a general inverter type (online type) uninterruptible power supply. Further, the present invention can be applied to the operation management of a computer system.

It is a block diagram which shows the structure of 1st Embodiment of this invention. It is a figure which shows the structure of the table in the 1st Embodiment of this invention. It is a flowchart which shows the operation | movement in the 1st Embodiment of this invention. It is a block diagram which shows the structure of 2nd Embodiment of this invention. It is a figure which shows the structure of the input voltage value memory | storage part in the 2nd Embodiment of this invention. It is a figure which shows the structure of the load current value memory | storage part in the 2nd Embodiment of this invention. It is a figure which shows the structure of the table memory | storage part in the 2nd Embodiment of this invention. It is a figure which shows the structure of the power failure detection value memory | storage part in the 2nd Embodiment of this invention. It is a figure which shows the structure of the power failure state memory | storage part in the 2nd Embodiment of this invention. It is a figure which shows the structure of the load current maximum value memory | storage part in the 2nd Embodiment of this invention. It is a figure which shows the structure of the notification in the 2nd Embodiment of this invention. It is a flowchart which shows the operation | movement in the 2nd Embodiment of this invention. It is a flowchart which shows the operation | movement in the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the conventional uninterruptible power supply.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC power supply 2 Converter 3 Inverter 6 Load 7 Storage battery 8 Thyristor 9 Power failure detection circuit 100 Commercial power supply 201 Rectifier 202 Inverter 203 Switch 204 Charger 205 Storage battery 210 Power conversion circuit 300 Uninterruptible power supply device 320 Power failure detection means 330 Power failure detection value calculation means 331 Table 340 Load current value measurement means 400 Load 501 Measurement means 502 Output device 510 Processing device 511 Monitoring means 512 Measurement means 513 Calculation means 514 Comparison means 515 Notification means 520 Storage device 521 Input voltage value storage section 522 Load current value storage section 523 Load current maximum value storage unit 524 Table storage unit 525 Power failure detection value storage unit 527 Power failure state storage unit

Claims (30)

A power failure detection system comprising power failure detection value calculation means for calculating a power failure detection value based on a load current value. A means for measuring a load current value; a power failure detection value calculating means for calculating a power failure detection value based on the load current value; a means for monitoring an input voltage value; and comparing the power failure detection value with the input voltage value. And a power failure notification means for notifying a power failure based on the comparison result. Means for sequentially measuring a load current value; power failure detection value calculating means for sequentially calculating a power failure detection value based on the load current value; means for monitoring an input voltage value; the power failure detection value and the input voltage value. A power failure detection system comprising means for comparing and power failure notification means for notifying a power failure based on the comparison result. The power failure detection value calculation means calculates a plurality of types of power failure detection values for each load current value, and the power failure notification means can identify which of the plurality of types of power failure detection values is detected. The power failure detection system according to claim 2 or 3, wherein a power failure is notified by the operation. The power failure detection system according to claim 2, wherein the power failure notification means notifies the load current value together. The power failure detection system according to claim 2, 3, 4, or 5, wherein the power failure notification means notifies the input voltage value together. 7. The power failure detection system according to claim 2, wherein the power failure notification means notifies the power failure detection value together. The said power failure detection value calculation means uses the maximum value of the said load current value within the predetermined fixed time as said load current value, The claim 1, The claim 2, The claim 3, The claim 3 characterized by the above-mentioned. The power failure detection system according to claim 4, claim 5, claim 6, claim 7, or claim 8. The said power failure detection value calculation means has a table which stored the said power failure detection value corresponding to the said load current value, The claim 1, 2, 3, 4, 5, The power failure detection system according to claim 6, claim 7, or claim 8. The power failure detected by the power failure detection system according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, or claim 9 is notified. And an uninterruptible power supply comprising means for switching to storage battery operation. A power failure detection method, wherein the processing device calculates a power failure detection value based on a load current value. The processing device measures the load current value, calculates the power failure detection value based on the load current value, monitors the input voltage value, compares the power failure detection value with the input voltage value, and compares the result. A power failure detection method characterized by notifying a power failure based on the above. The processing device sequentially measures the load current value, sequentially calculates the power failure detection value based on the load current value, monitors the input voltage value, compares the power failure detection value with the input voltage value, and compares A power failure detection method characterized by notifying a power failure based on a result. The processing device calculates a plurality of types of power failure detection values for each of the load current values, and notifies the power failure in a format that can identify which of the plurality of types of power failure detection values is detected. The power failure detection method according to claim 12 or claim 13. The power failure detection method according to claim 12, wherein the processing device notifies the load current value together. The power failure detection method according to claim 12, wherein the processing device notifies the input voltage value together. The power failure detection method according to claim 12, 13, 14, 15, or 16, wherein the processing device notifies the power failure detection value together. The processing device uses a maximum value of the load current value within a predetermined time period as the load current value, wherein the processing device uses the maximum load current value. The power failure detection method according to claim 15, claim 16, claim 17, or claim 18. The processing device has a table that stores the power failure detection value corresponding to the load current value, wherein the processing device has a table that stores the power failure detection value. The power failure detection method according to claim 17 or claim 18. The power failure detected by the power failure detection method according to claim 11, claim 12, claim 13, claim 14, claim 15, claim 16, claim 17, claim 18 or claim 19 is notified. And an uninterruptible power supply comprising means for switching to storage battery operation. A power failure detection program that causes a processing device to perform a process of calculating a power failure detection value based on a load current value. In the processing device, the load current value is measured, the power failure detection value is calculated based on the load current value, the input voltage value is monitored, the power failure detection value is compared with the input voltage value, and the comparison result is obtained. A power failure detection program characterized in that a process for notifying a power failure is performed. The processing device sequentially measures the load current value, sequentially calculates the power failure detection value based on the load current value, monitors the input voltage value, compares the power failure detection value with the input voltage value, and compares A power failure detection program that performs a process of notifying a power failure based on a result. A processing device is configured to calculate a plurality of types of power failure detection values for each load current value and perform a process of notifying a power failure in a format that can identify which of the plurality of types of power failure detection values is detected. 24. A power failure detection program according to claim 22 or claim 23. 25. The power failure detection program according to claim 22, wherein the processing device is configured to perform a process of notifying the load current value together. 26. The power failure detection program according to claim 22, 23, 24, or 25, wherein a processing device is caused to perform processing for notifying the input voltage value together. 27. The power failure detection program according to claim 22, 23, 24, 25, or 26, wherein a processing device performs processing for notifying the power failure detection value together. The processing device is caused to perform a process of using a maximum value of the load current value within a predetermined time as the load current value. The power failure detection program according to claim 24, claim 25, claim 26, claim 27, or claim 28. The processing device has a table storing the power failure detection value corresponding to the load current value. The claim 21, claim 22, claim 23, claim 24, claim 25, claim 26, A power failure detection program according to claim 27 or claim 28. The power failure detected by the power failure detection program according to claim 21, claim 22, claim 23, claim 24, claim 25, claim 26, claim 27, claim 28, or claim 29 is notified. And an uninterruptible power supply comprising means for switching to storage battery operation.

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