JP3969341B2 - Vehicle power supply - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention relates to a vehicle power supply device that electrically brakes a vehicle.
[0002]
[Prior art]
In recent years, the development of hybrid cars and electric cars has been rapidly progressing, and with this, the development of braking from the conventional mechanical control to the electric control has been rapidly progressing. Has been made.
[0003]
In general, a battery may be used as a power source to electrically control the vehicle. In this case, the vehicle cannot be controlled if power cannot be supplied for any reason. Therefore, proposals have been made that an auxiliary battery can be installed as an auxiliary power source to cope with an emergency.
[0004]
As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
[0005]
[Patent Document 1]
JP-A-5-116571 [0006]
[Problems to be solved by the invention]
However, since the auxiliary power supply is related to vehicle braking in an emergency, it is extremely important that power supply is reliably performed in an emergency, so that the life of the auxiliary power supply can be reliably predicted and the auxiliary power supply The ability to always detect the state is an extremely important point.
[0007]
Here, when a battery is used as an auxiliary power source, it is very difficult to predict the life of the battery, and even if the battery status and voltage can be confirmed, it is possible to detect a change in status only by the voltage. Because it was difficult, it was necessary to make an early periodic replacement. It was also intended to ensure higher safety.
[0008]
However, even if this battery is regularly replaced early and early, it is difficult to check the state of the battery every day or every time the vehicle is started, so it is difficult to further improve safety.
[0009]
The present invention solves the above-described conventional problems, realizes a power backup unit that can predict the life as an auxiliary power source and detect the state thereof, and is more reliable and safe. It aims at realizing the power supply device for vehicles.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is a vehicle power supply device used particularly when braking a vehicle by electrical control , according to information from a brake pedal and the traveling state of the vehicle. At least one of the information is input , and an electronic control unit provided so that information for controlling braking of the vehicle based on the information is output to the brake, and the electronic control unit via the electronic control unit A battery for supplying power to the brake; and an auxiliary power source for supplying power to the brake via the electronic control unit when the battery is abnormal. The auxiliary power source is formed by a plurality of capacitors. consists power backup unit using a capacitor unit being made from the power supply backup unit, the capacitor unit includes a plurality of the Capacitors are connected in series to form a capacitor row, two capacitor rows are connected in parallel, and two charging circuits for charging the power supply backup unit are connected to each capacitor row. The first charging circuit starts charging when the door open / close switch is turned on or when the keyless signal is turned on, and the second charging circuit starts charging when the ignition is turned on. The vehicle power supply apparatus is characterized in that electric charges are discharged from the vehicle.
[0011]
As a result, since a power backup unit comprising a capacitor is used as an auxiliary power supply, electric charge can be stored in the power backup unit as an emergency power supply only when the vehicle is operating, and the stored charge is released when the vehicle is not operating. Therefore, it is possible to greatly reduce the deterioration of the capacitor unit constituting the power backup unit, thereby greatly extending the life as an auxiliary power source and extending it to almost the same as the endurance life of the vehicle. As a result, maintenance-free operation as a power backup unit can be realized. In addition, since the power backup unit is charged and discharged every time the vehicle is operated, the reliability as the power backup unit can always be improved and the safety as the vehicle power supply device can be further improved. It is something that can be done. In addition, since it is possible to charge and discharge each capacitor row, the necessary power can be supplied to the electronic control unit each time, so the power supply time can be extended when the battery is abnormal and the vehicle ignition is turned on. Capacitor unit can be charged before turning on, so when the ignition that requires a lot of power supply is turned on, the charged charge can be discharged when the door open / close switch is turned on or when the keyless signal is turned on. A stable power supply is always possible.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings.
[0013]
1 and 2 are configuration diagrams of a vehicle power supply device according to Embodiment 1 of the present invention.
[0014]
First, in FIG. 1, reference numeral 1 denotes a 12V battery for supplying electric power to the vehicle, and a power backup unit 2 is provided as an auxiliary power source for the battery 1. An electronic control unit 3 that outputs information for controlling braking of the vehicle is provided, and power is supplied from the battery 1 and the power backup unit 2 to the electronic control unit 3. Further, a brake pedal 4 for transmitting information for controlling braking of the vehicle to the electronic control unit 3 is provided. Information from the brake pedal 4 is controlled via the electronic control unit 3 to control the brake 5. The tire 6 is braked by the brake 5.
[0015]
In the case of a vehicle in which the brake 5 is hydraulically controlled by electricity and brake control is performed by this hydraulic control, information from the brake pedal 4 is transmitted to the electronic control unit 3 as shown in FIG. The hydraulic pressure control unit 7 is supplied with electric power, the brake 5 is controlled by hydraulic pressure, and the tire 6 is braked.
[0016]
Next, a detailed configuration of the vehicle power supply device according to the present embodiment will be described. FIG. 3 is a circuit diagram of the vehicle power supply device according to Embodiment 1 of the present invention.
[0017]
In FIG. 3, a battery 1 is connected to an IG (ignition generator) terminal 9 provided in the power backup unit 2 via an ignition switch 8 for starting and ending the operation of the vehicle, and the power backup unit 2 And the + BC terminal 10 and the power supply terminal 20 for supplying power to the electronic control unit 3.
[0018]
The power backup unit 2 and the electronic control unit 3 are communication input terminals 11 for inputting signals from the electronic control unit 3 to the power backup unit 2, and communication outputs for outputting signals from the power backup unit 2 to the electronic control unit 3. The terminal 12 is connected to the output of the detected voltage and the OUT terminal 13 for outputting the charge stored in the power backup unit 2 when the battery 1 is abnormal.
[0019]
Here, the configuration of the power backup unit 2 will be described. The power supply backup unit 2 has a capacitor unit 15 as an auxiliary power source for supplying power to the brake 5 via the electronic control unit 3 when the battery 1 is abnormal. The capacitor unit 15 is rapidly charged, for example. It is formed using a plurality of capacitors which are electric double layer capacitors capable of discharging. The power backup unit 2 has a charging circuit 16 for charging the capacitor unit 15 and a discharging circuit 17 for discharging, and these are controlled based on instructions from the microcomputer 14. Furthermore, the power backup unit 2 has a backup detection means 18 for detecting the voltage output from the battery 1 as the first detection means. When the voltage abnormality is detected in the backup detection means 18, Further, an FET switch 19 is provided for enabling discharge from the capacitor unit 15 to the electronic control unit 3 via the OUT terminal 13.
[0020]
Further, the power backup unit 2 is provided with a second abnormality detection means for detecting an abnormality of the capacitor unit 15 based on the charging / discharging behavior. The second abnormality detection means includes the microcomputer 14, the charging unit The circuit 16 and the discharge circuit 17 are configured. A specific abnormality detection method for the capacitor unit 15 will be described in the second embodiment.
[0021]
Next, the operation of the vehicle power supply device will be described. First, for example, when the ignition is turned on in order to start the operation of the vehicle, the ignition switch 8 connected from the battery 1 to the IG terminal 9 is turned on, and the voltage 12V is supplied from the battery 1 to the power backup unit 2 and the electronic control unit 3. Is supplied. Then, a charging permission signal for permitting charging from the battery 1 to the capacitor unit 15 is input from the electronic control unit 3 to the power backup unit 2 via the communication input terminal 11, and the microcomputer 14 receives the charging permission signal. To the charging circuit 16. When charging is permitted, the battery 1 charges the capacitor unit 15 via the + BC terminal 10 and the charging circuit 16 to charge the battery 1 to be supplied to the electronic control unit 3 when the voltage is low or abnormal.
[0022]
On the other hand, the voltage output from the battery 1 via the + BC terminal 10 is detected by a sensor provided in the backup detection means 18 and output to the OUT terminal 13. If the voltage output from the battery 1 is equal to or higher than the reference value (9.5 V), it is confirmed that the voltage from the battery 1 and the operation of the power backup unit 2 are normal, and the electronic control unit from the battery 1 3 is continuously supplied with electric power.
[0023]
Thus, the vehicle can operate normally. When the brake pedal 4 is operated, the electronic control unit 3 receives information from the brake pedal 4 and controls braking of the vehicle based on the information. Information is output to the brake 5. Then, the brake 5 is actuated by the output information, and the tire 6 can be reliably braked, and as a result, the vehicle can be reliably controlled.
[0024]
Further, in the case of a vehicle that electrically controls the hydraulic pressure of the hydraulic control unit 7, information for controlling braking of the vehicle is transmitted from the electronic control unit 3 to the hydraulic control unit 7, and braking is performed by the hydraulic pressure of the hydraulic control unit 7. 5 operates to brake the tire 6.
[0025]
The detection of the voltage output from the battery 1 is always performed while the vehicle is operating.
[0026]
Thereafter, when the ignition is turned off to end the operation of the vehicle, the ignition switch 8 connected from the battery 1 to the IG terminal 9 is turned off, and the power supply from the battery 1 is stopped. At this time, the microcomputer 14 transmits a signal for instructing the discharge of the electric charge stored in the capacitor unit 15 to the discharge circuit 17. Based on this signal, the discharge circuit 17 discharges the electric charge stored in the capacitor unit 15. Due to this discharge, the deterioration of the capacitor unit 15 can be greatly reduced, so that the power backup unit 2 can have a longer life as an auxiliary power source, and thereby can be extended to almost the same as the durability life of the vehicle. Thus, maintenance-free operation of the power backup unit 2 can be realized.
[0027]
Next, the operation of the vehicle power supply device when the voltage of the battery 1 is reduced or abnormal will be described.
[0028]
When the operation of the vehicle is started, electric charge is charged from the battery 1 to the capacitor unit 15, and the voltage output from the battery 1 is detected by the backup detection means 18 and output to the OUT terminal 13. Electric power is supplied to the electronic control unit 3. Here, since the backup detection means 18 includes a sensor for detecting an abnormality of the battery 1, when the voltage detected by this sensor becomes less than the reference value (9.5 V) when detecting the voltage, the backup detection means 18 The backup detection means 18 detects that the output voltage is abnormal.
[0029]
Based on the information in which this abnormality is detected, the FET switch 19 that is normally OFF is turned ON, and discharging from the capacitor unit 15 to the OUT terminal 13 is enabled, and the power supply from the battery 1 is stopped. Then, a signal instructing the discharge of the electric charge stored in the capacitor unit 15 is transmitted from the backup detection means 18 to the microcomputer 14. The electric charge stored in the capacitor unit 15 by this instruction is output to the OUT terminal 13 via the FET switch 19 and supplied to the electronic control unit 3.
[0030]
On the other hand, when the battery 1 is abnormal, a signal is transmitted from the microcomputer 14 to the communication output terminal 12 and further, for example, an indication that the battery 1 is abnormal is displayed inside the vehicle via the electronic control unit 3. And instruct them to stop the vehicle immediately. When this abnormality occurs, the electric charge stored in the capacitor unit 15 is supplied to the electronic control unit 3 as an emergency power source, so that the driver can operate the brake 5 from the brake pedal 4 via the electronic control unit 3. The vehicle can be safely stopped.
[0031]
When the abnormality of the capacitor unit 15 is detected by the second detection means during the operation of the vehicle, the fact that the capacitor unit 15 is abnormal is transmitted to the electronic control unit 3 via the communication output terminal 12, and the battery As in the case of 1 abnormality, the fact that the capacitor unit 15 is abnormal is displayed. As a result, the driver can request the maintenance company to inspect and replace the capacitor unit 15.
[0032]
In this embodiment, the vehicle operation start time is the ignition ON time, but it may be the door opening / closing switch ON time or the keyless signal ON time.
[0033]
As described above, according to the present embodiment, the auxiliary power source for supplying power to the electronic control unit 3 of the vehicle is provided, and the auxiliary power source includes the capacitor unit 15, so that the battery 1 can be operated in an abnormal state. However, since the backup detection means 18 detects an abnormality of the battery 1 and power is supplied from the capacitor unit 15 to the electronic control unit 3, the reliability as the power backup unit can always be further improved. A highly safe vehicle power supply device can be obtained.
[0034]
(Embodiment 2)
Embodiment 2 of the present invention will be described below with reference to the drawings. In the present embodiment, a specific abnormality detection method for capacitor unit 15 of the first embodiment will be described in particular.
[0035]
4 is a flowchart for determining deterioration abnormality of the capacitor unit 15, FIG. 5A is a diagram showing a standard internal capacitance value of the capacitor unit 15 set in advance for each temperature, and FIG. 5B is a diagram showing each temperature. FIG. 6 is a diagram showing a standard internal resistance value of the capacitor unit 15 set in advance with respect to FIG. 6, and FIG. 6 is a diagram showing a limit value of the internal resistance value with respect to the internal capacitance value of the capacitor unit 15 set in advance for each temperature. is there. Hereinafter, as an example of the present embodiment, numerical values obtained in FIGS. 5A and 5B will be described.
[0036]
First, at the start of the vehicle operation, for example, when the ignition is turned on, the capacitor unit 15 is charged with 12V (FIG. 4A). The internal capacitance value (20F) and internal resistance value (130 mΩ) of the capacitor unit 15 are measured from the charging voltage and charging current measured at the time of charging, and the temperature (0 ° C.) at the time of charging is further measured (see FIG. 4 (b)).
[0037]
Here, since the internal capacitance value and the internal resistance value of the capacitor unit 15 are obtained from the charging voltage and the charging current measured at the time of charging, the internal capacitance value and the internal resistance value are actually measured. Only at 15 charging. After charging, the internal capacitance value and internal resistance value of the capacitor unit 15 after charging are estimated based on the temperature of the capacitor unit 15 at the time of measurement. The method will be described below.
[0038]
When the capacitor unit 15 is charged, as shown in FIG. 5A, the internal capacitance value (20F) of the capacitor unit 15 obtained at the time of charging and the standard internal capacitance value (28F) at the temperature (0 ° C.) at the time of charging. And the internal resistance value (130 mΩ) of the capacitor unit 15 obtained at the time of charging and the standard internal resistance value of the capacitor unit 15 at the temperature (0 ° C.) at the time of charging (see FIG. 5B). 60 mΩ) is obtained (FIG. 4C). 5A and 5B, the difference in internal capacitance value is 8F, and the difference in internal resistance value is 70 mΩ.
[0039]
Since the temperature measurement of the capacitor unit 15 is always performed (FIG. 4D), the capacitor unit 15 is detected for each temperature change from the obtained difference in internal capacitance value and difference in internal resistance value (8F, 70 mΩ). The internal capacitance value and the internal resistance value are corrected (FIG. 4E). Then, the corrected internal capacitance value and internal resistance value are compared with the limit resistance value with respect to the internal capacitance value of the capacitor unit 15 set at the correction temperature shown in FIG. )). This determination is made every 5 minutes. Thereby, the deterioration determination of the capacitor unit 15 can be performed.
[0040]
At the time of this determination, if the internal resistance value of the capacitor unit 15 does not exceed the limit value shown in FIG. 6, it is determined that the capacitor unit 15 is normal, but if it exceeds the limit value, the capacitor unit 15 is deteriorated abnormally. It is determined that the vehicle is abnormal, and the abnormality is displayed inside the vehicle (when it is determined normal here, the process returns to (d)).
[0041]
In the present embodiment, the internal capacitance value when the temperature of the capacitor unit 15 changes from 0 ° C. to 15 ° C. and 30 ° C. is shown in FIG. 5A, and the internal resistance value is shown in FIG. 5B. . From the obtained difference (8F, 70 mΩ), the internal capacitance value 21F at 15 ° C., the internal resistance value 115mΩ, the internal capacitance value 21F at 30 ° C., and the internal resistance value 110mΩ are obtained.
[0042]
These obtained values will be described with reference to FIG. In this embodiment, as shown in FIG. 6, the limit value is 230 mΩ for 20 F and 130 mΩ at 0 ° C., 21 F at 15 ° C., and the limit value is 180 mΩ for 115 mΩ, and 21 F and 110 mΩ at 30 ° C. Since the limit value is 80 mΩ, it is determined that the capacitor unit 15 is normal at 0 ° C. and 15 ° C. and abnormal at 30 ° C.
[0043]
Here, when it is determined that the capacitor unit 15 is abnormal, measurement is performed again after 5 minutes (FIG. 4G). If it is determined that the capacitor unit 15 is abnormal again at this time, the deterioration abnormality of the capacitor unit 15 is detected. After confirming (FIG. 4 (h)), an indication that the capacitor unit 15 is abnormal due to deterioration is displayed inside the vehicle to notify the driver of the abnormality. If it is determined to be normal at the time of this re-measurement, the process returns to FIG. 4D, and measurement is continued, and deterioration determination is performed again.
[0044]
In this embodiment, the vehicle operation start time is the ignition ON time, but it may be the door switch ON time or the keyless signal ON time.
[0045]
As described above, according to the present embodiment, every time the power backup unit is charged, the internal capacitance value and the internal resistance value of the capacitor unit are corrected, and the limit value of the internal resistance value at the temperature at the time of measurement is further calculated. By comparing, it is possible to check the deterioration state of the capacitor unit for each charge, so that the reliability of the power backup unit against temperature changes can be further increased, and the safety as a power supply device for vehicles can be further increased. It is something that can be done.
[0046]
(Embodiment 3)
Embodiment 3 of the present invention will be described below with reference to the drawings.
[0047]
FIG. 7 is a circuit diagram of a vehicle power supply device according to Embodiment 3 of the present invention.
[0048]
In FIG. 7, the configuration different from the first embodiment is a configuration in which a door switch 25 for starting the operation of the vehicle is provided, a plurality of charging circuits are provided, and a capacitor row is connected to each circuit, A configuration that enables charging / discharging for each column, a configuration in which a boost DC / DC converter 24 is provided to boost the voltage discharged from the capacitor unit 15 via the diodes 22 and 23, and the other configurations Since the configuration is the same as that of the first embodiment, the description will focus on the above different configurations.
[0049]
The door switch 25 is provided between the battery 1 and the power backup unit 2. When the switch for opening the door of the vehicle is turned on to start the running of the vehicle, the door switch 25 is turned on, the voltage 12V is supplied from the battery 1 to the electronic control unit 3, and the microcomputer 14 permits charging. The signal is received, and the first charging circuit 16 is instructed to permit charging. Then, the battery 1 charges the column (a) of the capacitor unit 15 via the + BC terminal 10 and the first charging circuit 16.
[0050]
Next, when the ignition switch 8 is turned on to turn on the ignition, the electric charge is charged from the battery 1 to the column (b) of the capacitor unit 15 via the + BC terminal 10 and the second charging circuit 21.
[0051]
When the ignition is turned on, the electric charge is already charged in the column (a) of the capacitor unit 15. At this time, the electric charge charged in the column (a) of the capacitor unit 15 is discharged and supplied to the electronic control unit 3. can do. As a result, even when the ignition that requires a large amount of power supply to the electronic control unit 3 is turned on, stable power supply to the electronic control unit 3 is possible.
[0052]
Thereafter, when the operation of the vehicle is ended, that is, when the ignition is turned off, the electric charge stored in each column of the capacitor units 15 (a) and (b) is discharged through the discharge circuit 17.
[0053]
Next, the operation of the vehicle power supply device when the voltage of the battery 1 is reduced or abnormal will be described. When the backup detection means 18 detects that the voltage detected from the battery 1 is abnormal after the operation of the vehicle is started, the electric charge is discharged from the capacitor unit 15 to the OUT terminal 13, but in the present embodiment, Only a part of the charges stored in the capacitor unit 15, for example, only the charge in the row (a), is discharged in advance through the diode 22 connected to this row in accordance with an instruction from the microcomputer 14, and the FET The voltage is supplied from the switch 19 to the electronic control unit 3 through the OUT terminal 13.
[0054]
After supplying the charges in the column (a), the supply voltage gradually decreases. When the operable voltage of the electronic control unit 3 is interrupted, the electronic control unit 3 cannot operate. For this reason, before interrupting the operable voltage, the charge stored in the capacitor unit 15 (b) column is discharged through the diode 23 of the column connected to this column, and in parallel with the FET switch 19. The voltage is boosted by the connected boost DC / DC converter 24 and supplied to the electronic control unit 3 through the OUT terminal 13. Thereby, since the operable voltage of the electronic control unit 3 can be maintained, the electronic control unit 3 can be continuously supplied with electric power.
[0055]
Then, as in the first embodiment, the display unit displays that the battery 1 is abnormal, and informs the driver of this abnormality.
[0056]
In the present embodiment, the vehicle operation start time is set to the time when the door switch is turned on, but the keyless signal switch may be turned on, and the columns for charging and discharging the capacitor unit 15 are defined as (a), ( Although the order is b), the order may be (b) and (a).
[0057]
As described above, according to the present embodiment, by charging / discharging for each column of the capacitor unit 15, stable power can be supplied even when the vehicle ignition is ON, and the electronic control unit 3 is necessary. Therefore, it is possible to extend the power supply time when the battery 1 is abnormal.
[0058]
【The invention's effect】
As described above, the present invention has an auxiliary power source for supplying electric power to the electronic control unit of the vehicle, and the auxiliary power source includes the capacitor unit, so that the electronic control unit can be operated by the auxiliary power source even when the battery is abnormal. Power supply can be reliably supplied to the vehicle, and every time vehicle operation is started, it is possible to check the operation of the power backup unit and the deterioration state of the capacitor unit. As well as a highly safe vehicle power supply device.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a vehicle power supply apparatus according to Embodiments 1 to 3 of the present invention. FIG. 2 is a configuration diagram of a vehicle power supply apparatus according to Embodiments 1 to 3 of the present invention. Fig. 4 is a circuit diagram of a power supply device for a vehicle in the first embodiment. Fig. 4 is a flowchart for determining deterioration abnormality of a capacitor unit in a second embodiment of the invention. Fig. 5 is a standard of a capacitor unit in the second embodiment of the invention. FIG. 6B is a diagram showing the standard internal resistance value of the capacitor unit according to the second embodiment of the present invention. FIG. 6 is a diagram showing the internal resistance value with respect to the internal capacitance value of the capacitor unit according to the second embodiment of the present invention. FIG. 7 is a circuit diagram of a vehicle power supply device according to Embodiment 3 of the present invention.
DESCRIPTION OF SYMBOLS 1 Battery 2 Power supply backup unit 3 Electronic control part 4 Brake pedal 5 Brake 6 Tire 7 Hydraulic control part 8 Ignition switch 9 IG terminal 10 + BC terminal 11 Communication input terminal 12 Communication output terminal 13 OUT terminal 14 Microcomputer 15 Capacitor unit 16 Charging circuit 17 Discharge circuit 18 Backup detection means 19 FET switch 20 Power supply terminal

Claims (8)

A power supply device for a vehicle used for braking a vehicle by electrical control , wherein at least one of information from a brake pedal and information according to a traveling state of the vehicle is input , and the information An electronic control unit provided to output information for controlling braking of the vehicle to the brake based on the battery, a battery for supplying electric power to the brake via the electronic control unit, and the battery An auxiliary power source for supplying power to the brake via the electronic control unit in the event of an abnormality, the auxiliary power source comprises a power backup unit using a capacitor unit formed of a plurality of capacitors, The capacitor unit forms a capacitor row in which a plurality of the capacitors are connected in series, and the capacitor row Two charging circuits are connected in parallel, and two charging circuits for charging the power supply backup unit are connected to the respective capacitor rows, and the first charging circuit is operated when the door opening / closing switch is ON or keyless. Charging starts when the signal is turned on, and charging of the second charging circuit starts when the ignition is turned on, and charges are discharged from the power backup unit when the vehicle operation ends .   The vehicle power supply device according to claim 1, wherein power is supplied from the electronic control unit to the hydraulic control unit, and braking of the vehicle is controlled via the hydraulic control unit.   The vehicle power supply device according to claim 1, wherein the capacitor is an electric double layer capacitor.   A first abnormality detection unit for detecting an abnormality of the battery is provided between the battery and the electronic control unit, and when the battery is abnormal, the information is transmitted from the first abnormality detection unit to the electronic control unit. The vehicle power supply device according to claim 1, wherein the power supply device is output.   A second abnormality detecting means for detecting an abnormality of the capacitor unit is provided between the capacitor unit and the electronic control section, and the information is output from the second abnormality detecting means to the electronic control section. The vehicular power supply device according to claim 1. 5. The vehicle power supply device according to claim 4 , wherein the first abnormality detection means detects abnormality by detecting a voltage output from the battery. 6. The vehicular power supply apparatus according to claim 5 , wherein the second abnormality detecting means detects abnormality based on charging / discharging behavior of the capacitor unit. The second abnormality detection means measures the temperature of the capacitor unit at the time of charge of the power supply backup unit, the internal capacitance value and the internal resistance value of the capacitor unit, and the measured internal capacitance value and The difference between the internal resistance value and the standard internal capacitance value and the standard internal resistance value of the capacitor unit at the preset temperature at the time of charging is obtained, and based on these differences, after a predetermined time has elapsed from the time of charging. The internal capacitance value and the internal resistance value of the capacitor unit at the temperature are corrected, the corrected internal capacitance value and internal resistance value of the capacitor unit, and the capacitor at the temperature after the predetermined time set in advance are preset. By comparing the limit value of the internal resistance value against the internal capacitance value of the unit, the key The power supply device according to claim 5, characterized in that to determine the deteriorated state of Pashitayunitto.

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