Failure determination device and program

Abstract

To provide a failure determination device and a program capable of accurately determining a rectifier failure.SOLUTION: A failure determination device for a rectifier that supplies power to charge a battery unit includes a counting unit that counts the number of times a power outage voltage is detected in the input / output unit of the battery unit during a specified period, and a failure determination unit that determines whether the rectifier has failed on the basis of the number of times the power outage voltage is detected.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a failure determination device and a program. [Background technology]

[0002] It is known that a battery unit including a rechargeable battery is provided as a backup power source in a device that can operate on electricity (see, for example, Patent Document 1). Such a battery unit is charged by, for example, supplying power to the battery unit from a rectifier connected to a load line. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-178401 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if a failure occurs in the rectifier (for example, deterioration of the internal capacitor), the capacitance component of the load on the load line may become insufficient, and oscillation may occur at the input of the battery unit during charging.

[0005] When this oscillation occurs, the battery unit detects a power outage and begins discharging, reducing the battery unit's capacity and making it unable to provide backup power in the event of a power outage. This problem can be solved by replacing the rectifier, but since the timing for replacing the rectifier is unknown, a device that can accurately determine rectifier failure is desired.

[0006] An object of the present disclosure is to provide a failure determination device and program that can accurately determine a failure in a rectifier. [Means for solving the problem]

[0007] The failure determination device according to the present disclosure comprises: A fault determination device for a rectifier that supplies power for charging a battery unit, comprising: a counting unit that counts the number of times a power outage voltage is detected in an input / output unit of the battery unit during a specified period; a failure determination unit that determines whether or not the rectifier has a failure based on the number of times the power failure voltage has been detected; Equipped with.

[0008] The program according to the present disclosure is A program for determining a fault in a rectifier that supplies power for charging a battery unit, On the computer, a process of counting the number of times a power outage voltage is detected in an input / output unit of the battery unit for a specified period of time; A process of determining whether or not the rectifier has a fault based on the number of times the power failure voltage has been detected; Execute the following. [Effects of the Invention]

[0009] According to the present disclosure, a rectifier failure can be accurately determined. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a backup system to which a failure determination device according to an embodiment of the present invention is applied; [Figure 2] FIG. 2 is a block diagram showing the configuration of a control unit. [Figure 3] FIG. 10 is a diagram showing the change over time of the input voltage when a power outage occurs. [Figure 4] FIG. 10 is a diagram showing the time variation of the input voltage due to a rectifier failure. [Figure 5] 10 is a flowchart illustrating an example of an operation of failure determination control in a backup system. [Figure 6] FIG. 10 is a diagram showing the time variation of the input voltage due to a rectifier failure. [Figure 7]10 is a flowchart illustrating an example of an operation of failure determination control in a backup system. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings. Fig. 1 is a diagram schematically illustrating a backup system 1 to which a failure determination device according to an embodiment of the present disclosure is applied.

[0012] As shown in FIG. 1, the backup system 1 is a system provided as a backup power source for, for example, a load 2 that can operate on electric power (e.g., a railway crossing, etc.), and includes a battery unit 10, an output unit 20, and a charging unit 30.

[0013] The backup system 1 is connected to a load line 2A for supplying power to a load 2. The backup system 1 can supply power from a battery unit 10 to the load 2 via the load line 2A. The backup system 1 can charge the battery unit 10 by receiving power from a rectifier 3 (e.g., a silicon constant voltage rectifier) ​​connected to the load line 2A via the load line 2A. The backup system 1 also has a function for determining whether the rectifier 3 has failed. The determination of whether the rectifier 3 has failed will be described later.

[0014] The battery unit 10 has a plurality of batteries 10A connected in parallel to one another. Each of the plurality of batteries 10A is, for example, a nickel-metal hydride battery or a lithium-ion battery.

[0015] The positive electrodes of the plurality of batteries 10A are connected to the output section 20 and the charging section 30. The negative electrodes of the plurality of batteries 10A are connected to, for example, ground.

[0016] The output unit 20 is a part for outputting the power discharged from each battery 10A of the battery unit 10 to the load 2. The output unit 20 is composed of a plurality of switches 20B. Each of the plurality of switches 20B is provided on each of a plurality of discharge power lines 20A connected to each of the plurality of batteries 10A of the battery unit 10.

[0017] Each of the multiple discharge power lines 20A is connected to an input / output unit 1A of the backup system 1, and is connected to a load line 2A via the input / output unit 1A. Under the control of a control unit 33 (described later), the switch 20B is turned on when each battery 10A is discharging, thereby making each discharge power line 20A conductive. The switch 20B is turned off at times other than when discharging, thereby making each discharge power line 20A non-conductive.

[0018] The charging unit 30 is a charging device that charges each battery 10A of the battery unit 10 by a constant current charging method. The charging unit 30 has a supply unit 31, a detection unit 32, and a control unit 33.

[0019] The supply unit 31 is a part for supplying power from the rectifier 3 to the battery unit 10, and is connected in parallel to the output unit 20, to the input / output unit 1A and the battery unit 10. The supply unit 31 has a DC-DC converter 31A, a switch unit 31B, and a constant current circuit 31C.

[0020] The DC-DC converter 31A is a circuit that boosts the DC power (voltage) from the load line 2A. The DC-DC converter 31A outputs a DC voltage boosted from the DC voltage from the load line 2A to a plurality of power supply lines 30A connected to the plurality of batteries 10A, respectively.

[0021] The switch unit 31B is made up of a plurality of switches 31D provided on each of the plurality of power supply lines 30A. Each switch 31D switches the power supply line 30A between conductive and non-conductive states. Specifically, under the control of the control unit 33, the switches 31D are turned on when the batteries 10A are being charged, thereby making the power supply lines 30A conductive. The switches 31D are turned off when the batteries 10A are not being charged, thereby making the power supply lines 30A non-conductive.

[0022] The constant current circuit 31C is a circuit that supplies a constant current regardless of the input voltage level, and is provided to correspond to each of the multiple batteries 10 A. Specifically, the constant current circuit 31C is provided between the switch 31D and the battery 10 A on each of the multiple power supply lines 30 A.

[0023] In the supply unit 31, when the power supply line 30A is made conductive by the switch 31D of the switch unit 31B, the voltage output from the DC-DC converter 31A is input to the constant current circuit 31C of each power supply line 30A. A constant charging current output from each constant current circuit 31C is then supplied to each battery 10A, charging each battery 10A.

[0024] In this way, in the backup system 1, when the battery units 10 are being charged, all of the power supply lines 30A are made conductive by the switch section 31B, and each battery 10A is simultaneously charged with a constant charging current.

[0025] The detection unit 32 is a sensor that detects the voltage level (input voltage) of the input part (input / output unit 1A) of the backup system 1. The detection unit 32 outputs the detected input voltage to the control unit 33.

[0026] The control unit 33 includes a central processing unit (CPU), read-only memory (ROM), random access memory (RAM), and input / output circuits (not shown). The CPU reads a program corresponding to the processing content from the ROM, loads it into the RAM, and works with the loaded program to centrally control the operation of each block of the backup system 1. The control unit 33 controls, for example, the switch 20B of the output unit 20 and the switch unit 31B of the charging unit 30 according to the operating state of the backup system 1.

[0027] Specifically, when the battery unit 10 is discharging, the control unit 33 turns on the switch 20B of the output unit 20 and turns off the switch 31B of the charging unit 30. When the battery unit 10 is charging, the control unit 33 turns off the switch 20B of the output unit 20 and turns on the switch 31B of the charging unit 30. Furthermore, when the battery unit 10 is not discharging or charging, the control unit 33 turns off the switch 20B of the output unit 20 and the switch 31B of the charging unit 30.

[0028] Next, a description will be given of how to determine whether or not the rectifier 3 in the backup system 1 has a fault.

[0029] 2, the control unit 33 includes a charge / discharge control unit 331, a restart determination unit 332, a counting unit 333, a fault determination unit 334, and a notification unit 335. The control unit 33 corresponds to the "fault determination device" of the present disclosure.

[0030] The charge / discharge control unit 331 controls the switch 20B and the switch unit 31B during charging and discharging as described above, and also controls charging and discharging of the battery unit 10 according to the input voltage of the backup system 1 detected by the detection unit 32.

[0031] Specifically, when the input voltage becomes equal to or lower than the power failure detection voltage while the rectifier 3 is in a state capable of charging the battery unit 10, the charge / discharge control unit 331 switches the battery unit 10 from a charging state to a discharging state. In other words, the charge / discharge control unit 331 discharges the battery unit 10 at the timing when the counting unit 333, which will be described later, counts the power failure voltage.

[0032] The chargeable state is a state in which power can be supplied from the rectifier 3 to the battery unit 10, and specifically, a state in which the switch unit 31B of the charging unit 30 is turned on and the switch 20B of the output unit 20 is turned off.

[0033] The power outage detection voltage value may be any voltage value that can be set, such as a voltage level low enough to indicate that the output voltage of the rectifier 3 is in a power outage state. For example, as shown in Fig. 3, when a power outage occurs, the input voltage of the rectifier 3 drops suddenly and falls below the power outage detection voltage value. The charge / discharge control unit 331 recognizes via the detection unit 32 that the input voltage has fallen below the power outage detection voltage value, and switches the battery unit 10 from a charging state to a discharging state.

[0034] The restart determination unit 332 determines whether to restart charging of the battery unit 10 after the battery unit 10 is changed from a charging state to a discharging state. Specifically, the restart determination unit 332 determines to restart charging of the battery unit 10 if the input voltage is greater than the power outage detection voltage value after a certain time has elapsed since the battery unit 10 was changed from a charging state to a discharging state.

[0035] When the resumption determination unit 332 determines that charging of the battery unit 10 should be resumed, the charge / discharge control unit 331 resumes charging of the battery unit 10.

[0036] The certain period of time is the waiting time from the detection of a power outage until charging is resumed, and may be an appropriately settable period of time, such as 10 seconds. In the backup system 1, it may be detected that the input voltage has fallen below the power outage detection voltage value for some reason. Therefore, by setting a certain waiting period before resuming charging of the battery unit 10, it is possible to continue charging control in the backup system 1 even when the input voltage falls below the power outage detection voltage value.

[0037] Furthermore, if the input voltage is equal to or lower than the power failure detection voltage value after a certain time has elapsed since the battery unit 10 was switched from a charging state to a discharging state, the resumption determination unit 332 determines not to resume charging of the battery unit 10.

[0038] If the resumption determination unit 332 determines not to resume charging of the battery unit 10, the charge / discharge control unit 331 continues discharging the battery unit 10.

[0039] In the event of a power outage, the backup system 1 resumes charging after the input voltage falls below the power outage detection voltage value, and then the input voltage falls below the power outage detection voltage value relatively quickly. In this case, it is highly likely that a power outage has occurred on the load line 2A. Therefore, in this case, the battery unit 10 continues discharging.

[0040] The resumption determination unit 332 may also repeatedly determine whether charging of the battery unit 10 should be resumed while discharging of the battery unit 10 continues.

[0041] The counting unit 333 counts the number of times that a power outage voltage is detected at the input unit (input / output unit 1A) of the battery unit 10 for a specified period of time. The specified period is a period for monitoring a failure determination of the rectifier 3, and may be an appropriately settable period such as 5 minutes.

[0042] Specifically, when the rectifier 3 is in a state where it can charge the battery unit 10, the counting unit 333 counts the detection of a power outage voltage when the input voltage becomes equal to or lower than the power outage detection voltage value.

[0043] For example, if the rectifier 3 fails due to degradation of the internal capacitor, the degree of oscillation in the input voltage increases over time, as shown in Figure 4. In this case, the input voltage falls below the power outage detection voltage, and the charge / discharge control unit 331 puts the battery unit 10 into a discharging state, after which the resumption determination unit 332 resumes charging of the battery unit 10. However, if the rectifier 3 fails, even if charging of the battery unit 10 is resumed, oscillation occurs again, and the input voltage falls below the power outage detection voltage over time. As a result, a situation occurs in which discharging and charging are repeated.

[0044] In this embodiment, the counting unit 333 can count the number of times (the number of times the power failure voltage is detected) that the battery unit 10 is repeatedly discharged and charged due to such a failure of the rectifier 3. For example, in the example shown in Fig. 4, the number of times that the input voltage becomes equal to or lower than the power failure detection voltage value during the specified period is three, so the counting unit 333 counts the number of times that the power failure voltage is detected as three.

[0045] Furthermore, the counting unit 333 suspends counting of the power failure voltage while the battery unit 10 is discharging. This makes it possible to prevent the power failure voltage from being counted while the battery unit 10 is discharging, that is, during the waiting time from when the power failure is detected until charging is resumed.

[0046] The fault determination unit 334 determines whether or not the rectifier 3 has a fault based on the number of times the power failure voltage has been detected. Specifically, the fault determination unit 334 determines that the rectifier 3 has a fault if the number of times the power failure voltage has been detected within a specified period is equal to or greater than a predetermined number. Furthermore, the fault determination unit 334 determines that the rectifier 3 has not a fault if the number of times the power failure voltage has been detected within a specified period is less than the predetermined number.

[0047] The predetermined number of times is the number of times that a power failure voltage is detected within a specified period of time at which it can be assumed that there is a high possibility of a failure of the rectifier 3, and is a number that can be set appropriately, for example, 3 to 8 times.

[0048] As a result, if a power outage voltage is detected a predetermined number of times or more within a specified period, it is determined that the rectifier 3 has failed, so that a failure in the rectifier 3 can be accurately determined.

[0049] When it is determined that the rectifier 3 has failed, the notification unit 335 notifies of the failure of the rectifier 3. For example, the notification unit 335 may output a command to a display device (not shown) to display information indicating the failure of the rectifier 3. The notification unit 335 may also output a command to an audio output device (not shown) to output information indicating the failure of the rectifier 3 by voice.

[0050] This allows the user to quickly grasp the failure of the rectifier 3, making it easier to quickly replace the rectifier 3.

[0051] Furthermore, the counting unit 333 may reset the number of detections that it has counted if it is not determined that the rectifier 3 is faulty within a specified period of time.

[0052] This resets the number of detections when the specified period has elapsed, thereby preventing the rectifier 3 from being determined to be faulty when the count reaches a predetermined number or more after the specified period has elapsed.

[0053] A description will be given of an example of the operation of the backup system 1 configured as above. Fig. 5 is a flowchart showing an example of the operation of failure determination control in the backup system 1. The processing in Fig. 5 is executed as appropriate, for example, when a command to start charging is received.

[0054] 5, the control unit 33 determines whether the input voltage to the battery unit 10 is equal to or lower than the power failure detection voltage value (step S101). If the determination result shows that the input voltage is greater than the power failure detection voltage value (step S101, NO), the control unit 33 determines whether charging has ended (step S102).

[0055] If the result of the determination is that charging has not finished (step S102, NO), the process returns to step S101. On the other hand, if charging has finished (step S102, YES), this control ends.

[0056] Returning to the determination in step S101, if the input voltage is equal to or less than the power failure detection voltage value (step S101, YES), the control unit 33 counts the number of times the power failure voltage has been detected (step S103). Specifically, the control unit 33 adds 1 to the number of times the detection has been counted up until step S103. The number of times the detection has been detected may be stored in, for example, a storage device (not shown).

[0057] After step S103, the control unit 33 determines whether the number of detections is equal to or greater than a predetermined number (step S104). If the result of the determination is that the number of detections is less than the predetermined number (step S104, NO), the control unit 33 performs discharge control of the battery unit 10 (step S105).

[0058] After step S105, the control unit 33 determines whether the input voltage is greater than the power failure detection voltage value (step S106). If the determination result shows that the input voltage is equal to or less than the power failure detection voltage value (step S106, NO), the process returns to step S105. That is, the discharge control continues.

[0059] On the other hand, if the input voltage becomes greater than the power failure detection voltage value (step S106, YES), the control unit 33 resumes charging (step S107). After step S107, the process returns to step S101.

[0060] Returning to the determination in step S104, if the number of detections is equal to or greater than the predetermined number of times (step S104, YES), the control unit 33 determines that the rectifier 3 is faulty (step S108). After step S108, the control unit 33 notifies the fact that the rectifier 3 is faulty (step S109).

[0061] After step S109, this control ends. Note that this control may end after a specified period has elapsed since the start of the process, or the number of detections may be reset and the process may be repeated again from step S101.

[0062] According to the present embodiment configured as described above, the failure determination unit 334 determines whether or not there is a failure in the rectifier 3 based on the number of times that a power outage voltage is detected. Specifically, the failure determination unit 334 determines that the rectifier 3 has a failure if the number of times that a power outage voltage is detected within a specified period of time is equal to or exceeds a predetermined number.

[0063] As a result, if a power outage voltage is detected a predetermined number of times or more within a specified period, it is determined that the rectifier 3 has failed, and so repeated oscillations caused by deterioration of the rectifier 3 can be detected as a failure of the rectifier 3. As a result, a failure of the rectifier 3 can be accurately determined.

[0064] Furthermore, if the counting unit 333 does not determine that the rectifier 3 has failed within the specified period, the counted number of detections is reset. As a result, it is possible to prevent the rectifier 3 from being determined to have failed when a specified number of discharges due to power outages have occurred after the specified period has passed.

[0065] Furthermore, when it is determined that the rectifier 3 has failed, the notification unit 335 notifies the user of the failure of the rectifier 3, allowing the user to quickly grasp the failure of the rectifier 3. As a result, it becomes easier to quickly replace the rectifier 3.

[0066] Furthermore, the counting unit 333 suspends counting of the power failure voltage while discharging the battery unit 10. As a result, it is possible to prevent the power failure voltage from being counted during the waiting time from when the power failure is detected until charging is resumed.

[0067] In the above embodiment, the battery unit 10 continues discharging unless charging is resumed after discharging has started, and in this case, a failure of the rectifier 3 is not determined. However, the rectifier 3 may fail for some reason other than failure due to aging, such as deterioration of the internal capacitor.

[0068] When the rectifier 3 is in a faulty state due to aging, the input voltage of the rectifier 3 oscillates, gradually increasing in amplitude over time (see, for example, Figure 4). When the charging mode is switched from charging to discharging, the output of the battery unit 10 becomes active, and it has been experimentally confirmed that the voltage of the input / output unit 1A (the voltage equivalent to the input voltage) becomes equal to or exceeds the power outage detection voltage.

[0069] In contrast, when the rectifier 3 is in a complete failure state, such as a failure due to end of life, the input voltage continues to oscillate with a relatively large amplitude (see, for example, FIG. 6). In this case, it has been experimentally confirmed that the oscillation state does not change even if the battery unit 10 is discharged.

[0070] A complete failure of the rectifier 3 can occur suddenly due to factors other than aging, such as the effects of lightning strikes, so even in such cases it is necessary to accurately determine whether the rectifier 3 has failed. Therefore, the failure determination unit 334 may determine that the rectifier 3 has failed if the total discharge time of the battery unit 10 is equal to or longer than a predetermined time, regardless of the number of times that power outage voltage has been detected.

[0071] More specifically, if the resumption determination unit 332 determines that there is no power outage and that charging cannot be resumed, the failure determination unit 334 determines whether or not there is a failure in the rectifier 3 based on the total discharge time of the battery unit 10.

[0072] For example, if the rectifier 3 is in a complete failure state, the input voltage will be in a continuous oscillation state, and the input voltage will exceed the power failure detection voltage value multiple times. Also, if the rectifier 3 is in a failure state due to aging, the input voltage will return to a normal value after discharging, and the input voltage will become greater than the power failure detection voltage value and then remain greater than the power failure detection voltage value. In other words, if there is no power failure, the input voltage will exceed the power failure detection voltage value at least once.

[0073] In such a case, the resumption determination unit 332 determines that the load line 2A is not in a power outage state. After determining that the load line 2A is not in a power outage state, the resumption determination unit 332 determines whether or not to resume charging based on the input voltage.

[0074] The resumption determination unit 332 determines to resume charging when the input voltage continues to be greater than the power outage detection voltage value. Also, the resumption determination unit 332 determines not to resume charging when the input voltage does not continue to be greater than the power outage detection voltage value and multiple instances of the input voltage exceeding the power outage detection voltage value are detected.

[0075] If the resumption determination unit 332 determines not to resume charging, the failure determination unit 334 determines whether or not there is a failure in the rectifier 3 based on the total discharge time of the battery unit 10. Specifically, the failure determination unit 334 determines that there is a failure in the rectifier 3 if the total discharge time is equal to or longer than a predetermined time.

[0076] The predetermined time is, for example, a time period during which the influence of the output voltage of the rectifier 3 continuing to oscillate is relatively small, and can be set appropriately.

[0077] This allows a fault in the rectifier 3 to be determined more accurately.

[0078] Furthermore, if the input voltage does not exceed the fault detection voltage value within a certain time after the start of discharging, the resumption determination unit 332 determines that a power outage has occurred. As a result, the resumption determination unit 332 determines that charging should not be resumed. In this case, the charge / discharge control unit 331 may continue discharging regardless of the total discharging time.

[0079] This makes it possible to distinguish between a power outage and a failure of the rectifier 3 when discharge continues, thereby preventing the rectifier 3 from being mistakenly determined to be faulty when discharge continues due to a power outage.

[0080] An example of the operation of the backup system 1 configured as above will now be described. Fig. 7 is a flowchart showing an example of the operation of failure determination control in the backup system 1. The processing in Fig. 7 is executed as appropriate, for example, when a command to start charging is received. Note that the processing in steps S101 to S105 and S107 to S109 in Fig. 7 is the same as the processing in steps S101 to S105 and S107 to S109 in the flowchart shown in Fig. 5, and therefore a description of these processing will be omitted.

[0081] 7, after step S105, the control unit 33 determines whether the load line 2A is in a power outage state (step S110). If the result of the determination is that the load line 2A is in a power outage state (step S110, YES), the process returns to step S105.

[0082] On the other hand, if the load line 2A is not in a power outage state (step S110, NO), the control unit 33 determines whether or not charging can be resumed (step S111). If the determination result indicates that charging can be resumed (step S111, YES), the process proceeds to step S107.

[0083] On the other hand, if charging cannot be resumed (step S111, NO), the control unit 33 determines whether the total discharge time is equal to or greater than a predetermined time (step S112). If the determination result shows that the total discharge time is less than the predetermined time (step S112, NO), the process returns to step S111.

[0084] On the other hand, if the total discharge time is equal to or longer than the predetermined time (step S112, YES), the process proceeds to step S108.

[0085] Even with this configuration, it is possible to accurately determine whether or not the rectifier 3 has failed. Furthermore, even if the rectifier 3 suddenly fails, for example, it is possible to accurately determine whether or not the rectifier 3 has failed.

[0086] Furthermore, in the above embodiment, the failure determination device is the control unit 33 of the backup system 1, but the present disclosure is not limited to this and may be provided outside the backup system 1. In this case, the failure determination device does not need to have the functions of the backup system, such as the charge / discharge control unit and the restart determination unit.

[0087] In the above embodiment, the charging device (charging unit 30) is provided with the detection unit 32, but the present disclosure is not limited to this, and the detection unit may not be provided. In this case, the control unit may acquire information on the input power from an external device.

[0088] Furthermore, in the above embodiment, the number of batteries 10A in the battery unit 10 is four, but the present disclosure is not limited to this, and the number may be any number as long as it is two or more.

[0089] Furthermore, the above-described embodiments are merely examples of specific embodiments for carrying out the present disclosure, and the technical scope of the present disclosure should not be interpreted as being limited by these embodiments. In other words, the present disclosure can be carried out in various forms without departing from its gist or main features. [Industrial Applicability]

[0090] The failure determination device of the present disclosure is useful as a failure determination device and program that can accurately determine a failure in a rectifier. [Explanation of symbols]

[0091] 1. Backup System 1A input / output section 2. Load 2A load line 3 Rectifier 10 Battery unit 10A battery 20 Output section 20A Discharge Power Line 20B switch 30 Live parts 30A supply power line 31 Supply section 31A DC-DC converter 31B Switch section 31C constant current circuit 31D Switch 32 Detection unit 33 Control Unit 331 Charge / Discharge Control Unit 332 Resumption judgment section 333 Counting Department 334 Failure determination section 335 Information Department

Claims

1. A fault determination device for a rectifier that supplies power for charging a battery unit, comprising: a counting unit that counts the number of times a power outage voltage is detected in an input / output unit of the battery unit during a specified period; a failure determination unit that determines whether or not the rectifier has a failure based on the number of times the power failure voltage has been detected; A failure determination device comprising:

2. the counting unit counts the detection of the power failure voltage when the voltage of the input / output unit becomes equal to or less than a power failure detection voltage value while the rectifier is in a state capable of charging the battery unit; The failure determination unit determines that the rectifier has failed when the number of times the power failure voltage has been detected is equal to or greater than a predetermined number. The failure determination device according to claim 1 .

3. a charge / discharge control unit that discharges the battery unit at the timing when the counting unit counts the power failure voltage; a restart determination unit that restarts charging of the battery unit after a predetermined time has elapsed since the start of discharging of the battery unit; Furthermore, the counting unit suspends counting the power failure voltage while the battery unit is discharging; The failure determination device according to claim 1 .

4. the failure determination unit determines that the rectifier has failed when a total discharge time of the battery unit is equal to or longer than a predetermined time, regardless of the number of times the power failure voltage has been detected. The failure determination device according to claim 3 .

5. the restart determination unit determines whether to restart charging of the battery unit based on a detected voltage of an input / output unit of the battery unit after a certain time has elapsed since the start of discharging of the battery unit; When it is determined that the charging of the battery unit should not be resumed, the charging / discharging control unit continues discharging the battery unit. The failure determination device according to claim 3 .

6. further comprising a notification unit that notifies the failure of the rectifier when it is determined that the rectifier has failed. The failure determination device according to claim 1 .

7. the counting unit resets the number of detections when it is not determined that the rectifier is faulty during the specified period. The failure determination device according to claim 1 .

8. A program for determining a fault in a rectifier that supplies power for charging a battery unit, On the computer, a process of counting the number of times a power outage voltage is detected in an input / output unit of the battery unit for a specified period of time; A process of determining whether or not the rectifier has a fault based on the number of times the power failure voltage has been detected; A program that executes the following.

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