WO1999025052A1

WO1999025052A1 - Service life controller for power unit

Info

Publication number: WO1999025052A1
Application number: PCT/JP1997/004072
Authority: WO
Inventors: Minoru Tsujihara
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1997-11-10
Filing date: 1997-11-10
Publication date: 1999-05-20

Abstract

A service life controller for power unit which can prolong the service life of a plurality of power units as a whole by making the deteriorating states of the power units nearly uniform. The controller is provided with power units (1a-1c), a common load (2) which is supplied with electric power from each power unit, a temperature detecting means (6) which detects the internal temperature of each power unit, an output current control means (5) which controls the output current of each power unit, and a service life monitoring means (3) which makes the internal temperatures of the power units nearly uniform by decreasing the output currents of power units having higher internal temperatures and increasing the output currents of power units having lower internal temperatures when a difference occurs among the internal temperatures of the power units.

Description

Specification

Technical field

The present invention relates to a life control device for a power supply device such as a parallel redundant system. Background art

として As a device for preventing the life of the power supply device from being shortened, there is, for example, a device described in JP-A-2-208708. The technology described in this prior art relates to a current balance circuit for balancing the current supplied from a redundant power supply, and attempts to increase the length of the power supply by controlling the current balance at all times. Is what you do. However, when a local thermal load was applied to the power supply unit, no consideration was given to making the thermal load uniform, etc., so the part where the local thermal load was applied was not considered. There is a problem that the power supply unit has a short life.

FIGS. 12 and 13 show a conventional parallel redundant power supply failure monitoring device disclosed in Japanese Patent Application Laid-Open No. 5-300650, for example. In FIG. 12, 1 & to 111 are ^^ power supplies, 2 is a load connected to the power supply, 5 is an output current (load current) detection, 6 is a detection unit, and 16 is a power supply. This section shows a fault monitoring device that monitors load current and ambient temperature. In FIG. 13, S1 is a step of reading the ambient temperature Τ 0 of the power supply installation location, S2 is a step of reading the load current Ia to Iη of each power supply, S3 is a step of determining the number of failed power supply units, S4 is a step for predicting the ambient temperature Τ0 and the load currents a to In of each power supply 1a to 1n.S5 is an increase due to power supply failure when only one power supply has failed. To predict the load currents I amax to Inmax of other healthy power supply units, and S6 is the same as step S4. Step S7 predicts the temperatures T1 to Tn of the respective power supply units 1a to 1n after a predetermined time.S7 is the same as step S5. The load current Iamax of another healthy power supply that increases due to the occurrence: A step of predicting Lnmax, S8 is a step of calculating the temperature Ta to Tn of the healthy power supply after a predetermined time from the predicted current of step S7. It is.

S9 is a step for comparing the numerical values predicted in steps S4, S6, and S8 with a reference value, and S1◦ is a step for issuing an alarm based on the comparison result in step S9. .

The operation of the fault monitoring device for a parallel redundant power supply described above will be described with reference to FIGS. 12 and 13. First, the failure monitoring device 16 reads ¾ST 0 around the power supply devices 1 a to: L n at a constant cycle (step S 1), and reads the load currents I a to In of the power supply devices 1 a to 1 n ( S 2). Next, the number of failed power supplies is determined from the value of the load current of the power supply device (eg, zero output current) (S3). From this judgment, the surroundings and load current when there is no faulty power supply are predicted (S4).

Next, when the number of failures is one, an increase in the load current of another power supply due to the failure of one power supply is predicted (S5). The ambient temperature after a predetermined time is predicted from the predicted value (S6).

Next, when the number of failed units is two, an increase in the load current of another power supply unit due to the failure of the two power supply units is predicted (S7). Predict around: as after a predetermined time from this predicted value (S8).

Next, the surroundings predicted in steps S4, S6, and S8 are compared with the specified value: & g. If the specified value is exceeded, an alarm is generated (S9).

The 1 ^ parallel redundant power supply failure monitoring device predicts the ambient temperature after a predetermined time when a power supply failure occurs and issues an alarm, so the life of a power supply that has not yet failed depends on the ambient temperature rise. There is a problem in that it is necessary to manage the power-on time, ambient temperature, etc. to determine whether the power supply has become short. Also, if the power supply fails and the load balance force ⁵ 'is not uniform, the load will concentrate on other power supplies, and only that power supply will be overloaded and its life will be shortened due to thermal stress There was a problem.

In addition, in the case of conventional equipment, an alarm is issued when the power supply unit fails, so it is necessary to replace the power supply unit after the failure, and replace the power supply unit that has become shorter before the failure. That was difficult.

Also, since the condition after a predetermined time is predicted from the ambient temperature and the load current, the cooling condition and load current condition have changed ^^, the system is stopped, and the cooling condition and load current condition are changed. There was a problem that the default value of the forecast had to be changed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is not necessary to record the life of a power supply, and a power supply having a shortened life is reduced in load to extend the life. It is an object of the present invention to provide a life control device of a power supply device which enables the power supply device.

It is another object of the present invention to provide a power supply life control device capable of displaying the life state of the power supply.

It is still another object of the present invention to provide a redundant parallel type power supply device that can reduce the load of the power supply device subjected to thermal stress or enhance cooling. Disclosure of the invention

A life control device for a power supply device according to the present invention is a power supply device for supplying power from a plurality of power supply devices (la) to (lc) to a common load (2), and detects an internal temperature of each power supply device. The detection means (6), the output current control means (7) for controlling the output current of each power supply and the device, and the output of the power supply whose internal temperature is high when there is an internal variation among the power supplies. Reduces current while decreasing internal temperature Increases the output current of the power supply to make the internal temperature of multiple power supplies nearly uniform With the provision of the monitoring means (3), the life of the power supply device can be extended. This is particularly true if the configuration of the power supply units (la) to (1c) is a parallel redundant system whose life is likely to be short.

Also, a storage means (11) for storing the inside of each power supply, a power-on time storage means (10) for storing the power-on time of each power supply, and an output current storage means for storing the output current of each power supply. (12), output current control means (7) for controlling the output current of each power supply, and the inside of the power supply read from the ¾S storage means; Estimate the degradation status of multiple power supplies based on the degradation information file for the load temperature and load time of the electronic components of the power supply, and when the degradation status varies among the power supplies, Life monitoring means (3) for reducing the output current of the power supply and increasing the output current of the power supply with little deterioration to make the deterioration state of the plurality of power supplies almost uniform. Can be extended Kill.

In addition, the life monitoring means (3) uses the information on the deterioration state of the plurality of power supply units which have been changed to deterioration display means, and the deterioration display means displays the deterioration state and the replacement time information which have been β. Can be replaced before failure. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a professional diagram illustrating a life control device for a parallel redundant power supply device according to the present invention.

FIG. 2 is an explanatory view showing a state in which the life control device for a parallel redundant power supply shown in FIG. 1 is incorporated in an electronic device.

FIG. 3 is a flowchart showing a process flow of the life monitoring unit.

FIG. 10 is an explanatory diagram showing another example of a state in which the control device of the fourth redundant power supply unit is incorporated in an electronic device.

FIG. 5 is a block diagram showing a life control device of the parallel redundant power supply device of the present invention. Yes, an example is shown in which an output current control unit is provided commonly to three power supply devices.

FIGS. 6, 7, and 8 are block diagrams showing a life control device of the parallel redundant power supply device of the present invention. FIG. 6 shows an example in which an energization time storage unit and a temperature storage unit are provided. FIG. 7 shows an example in which an energization time storage, a section, a storage section, and an output current storage section are provided, and FIG. 8 shows an example in which an energization time storage section and an output current storage section are provided.

FIG. 9 is a block diagram showing the life control device of the parallel redundant power supply device of the present invention, which is an example in which a deterioration display section for displaying the deterioration state of the power supply device is provided.

FIG. 10 is a block diagram showing a life control device for a parallel redundant power supply device according to the present invention, in which a variable cooling device for controlling the number of rotations of a cooling fan according to the deterioration state of the power supply device is provided.

FIG. 11 is a block diagram showing the IJ control device of the parallel redundant power supply device of the present invention, in which a notifying device for notifying the outside that the power supply device is about to be replaced is provided.

FIG. 12 is a block diagram showing a conventional fault monitoring system for a redundant power supply system.

FIG. 13 is a flowchart showing a conventional fault monitoring device for a parallel redundant power supply device. BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment A life control device for a parallel redundant power supply according to a first embodiment of the present invention will be described. FIG. 1 is a block diagram showing a life control device for a parallel redundant power supply according to Embodiment 1 of the present invention. FIG. 2 is an explanatory view showing a state in which the life control device for a parallel redundant power supply shown in FIG. 1 is incorporated in an electronic device. FIG. 3 is a flowchart illustrating a processing flow of the life monitoring unit. The power supply life control device can be effectively applied to various electronic devices such as servers and non-stop computers.

In FIG. 1, la, lb, and lc are parallel redundant power supplies, and 2 is this power supply. 1 a ~; load device connected to Lc, 3 is the load current of the power device, 3 is the life monitoring unit that monitors the inside of the power device and controls the output voltage of the power device, 4 is the power control of the power device , 5 is an output current detection unit that detects the load voltage of the power supply, 6 is a detection unit that detects the inside of the power supply, and 7 is an output current control unit that controls the output current of the power supply. Here, the life of the power supply is controlled by controlling the output current (load current).

Although not shown, the power supply units lb and lc have a power control unit 4, an output current detection unit 5, a temperature detection unit 6, and an output current control unit 7, similarly to the power supply unit la. I have.

In Fig. 2, 8 is an electronic device such as a computer, 9 is a ventilation unit for cooling the power supply units la, lb, and 1c, and arrows A and B represent a flow of cooling air from the ventilation unit and the soot 9. . Here, the power supply units 1a, lb, and 1c are provided on the leeward side of the cooling air.

Next, the operation will be described.

In FIG. 3, the life monitoring unit 3 first reads the load current detected by the output current detection unit 5 and the internal temperature detected by the detection unit 6 of each power supply device 1a, lb, 1c (step S31). Next, the life monitoring unit 3 determines whether or not variations have occurred from the internal temperatures of the power supply devices la, lb, and 1 c (step S32).

Then, when a variation occurs inside the power supply devices la, lb, and lc, the monitoring unit 3 controls the output current control unit 7 to reduce the load current of the power supply device whose internal temperature is rising (step S33). On the contrary, the output current control unit 7 is controlled so as to increase the load current of the power supply device having a low inside (step S34). As a result, the internal separation of the power supply devices la, lb, and lc is substantially uniform, and the life of the power supply devices la, lb, and 1c can be extended.

Normally, in a state where the power supply devices la, lb, and 1 c are incorporated in the electronic device 8, variations occur inside the power supply devices la, lb, and 1 c. An example For example, as shown in FIG. 2, the power supply units la, lb, and lc are sequentially arranged on the leeward side of the wind by the blower unit 9; the inside of the power supply unit 1c is the highest; The inside of the power supply is higher in the order of 1a.

In addition, in the age of the natural convection cooling system without the blower unit 9, the internal temperature of the power supply unit 1b in the middle becomes higher than the power supplies la and lc on both sides.

In addition, the life monitoring unit 3 calculates an average value from the maximum value and the minimum value of the inside detected by the detection unit 6, sets the average value as a reference: and determines whether the inside is lower or lower than the reference distance. Thus, the load current of the power supply may be reduced or increased.

In the power supply units la, lb, and 1c, the element that determines the life is the electrolytic capacitor (not shown) that has the shortest life among the components that make up the power supply unit. The life of the power supply device is determined by the length of the life of the electrolytic capacitor. Therefore, although the ¾Jg detector 6 measures the temperature inside the power supply, it is preferable to install the ¾Jg detector 6 so as to detect 検知 S around the electrolytic capacitor. As a result, the accuracy of measuring the life (temperature) of the power supply devices la, lb, and lc can be improved.

In FIG. 2, it is assumed that the power supply units la, lb, and 1 c are cooled by the air blow unit 9, and that the blowing air of the air blow unit 9 flows from the arrow A direction to the arrow B direction. Since the power supply 1c is located on the leeward side of the power supplies la and 1b, the power supply 1c receives heat corresponding to a temperature rise due to heat generated from the inside of the power supplies 1a and 1b. Similarly, since the power supply 1b is located on the leeward side of the power supply 1a, the power supply 1b receives the heat of the temperature rise due to the heat generated from the inside of the power supply 1a.

In this state, the life monitoring unit 3 reduces the load current of the power supply 1c by the output current control unit 7 of the power supply 1c, because the internal SJg (particularly around the electrolytic capacitor) power is increasing in the power supply lc. Then, lower the internal temperature of the power supply 1c itself. Similarly, the life monitoring unit 3 increases the internal temperature of the power supply 1b (particularly the ambient temperature of the electrolytic condenser). As the temperature rises, the load current of the power supply 1b is slightly reduced by the output current control unit 7 of the power supply 1b, and the internal temperature of the power supply lb itself is slightly reduced. Conversely, the life monitoring unit 3 uses the output current control unit of the power supply 1a because the internal temperature of the power supply la (particularly the ambient temperature of the electrolytic capacitor) is lower than those of the other power supplies 1b and 1c. 7, the load current of the power supply 1a is increased, and the load current to the load 2 is kept constant.

In the above-described embodiment, the preferred embodiment in which the power supply device is configured in a parallel redundant system in which the life is easily shortened has been described. However, two power supply devices may be configured in parallel, or four or more power supply devices may be used. A parallel configuration may be used.

Further, in the above-described embodiment, the power supply devices la, lb, and 1c are arranged on the downwind side of the blower unit 9 and three of them are incorporated in the electronic device 8, for example, as shown in FIG. The power supply units 1 a to 1 c are arranged on the windward side of the air blow unit 9 and between each component of the electronic device 8 and each air blow unit 9, and a partition plate 1 ◦ separates between the air passages. It may be partitioned.

Further, in the above-described embodiment, the ^^ in which the output current control unit 7 is disposed in each of the power supply devices la, lb, and 1c has been exemplified. For example, as shown in FIG. Do not place them inside the power supply units la, lb, 1c, but place one between the life monitoring unit 3 and the power supply units la, lb, 1c. The output current of the power supply device la, lb, 1c may be controlled. In this case, the device configuration can be simplified, and the device cost can be reduced.

Next, a description will be given of a second embodiment of the life control device for a parallel redundant power supply according to the present invention. FIG. 6 is a block diagram showing a life control device for a parallel redundant power supply according to Embodiment 2 of the present invention.

In FIG. 6, la, lb, and lc are power supply units, 2 is a load unit connected to the power supply unit, 3 is a load current of the power supply unit, monitoring the inside of the power supply unit ¾S, and controlling the output voltage of the power supply unit. A life monitoring unit that calculates the life of the power supply, 4 is a power control unit of the power supply, 5 is an output current detecting section for detecting the load current of the power supply, 6 is a temperature detecting section for detecting the temperature inside the power supply¾S detecting section, 7 is an output current control section for controlling the output current of the power supply, and 10 is a power control section 4 An energization time storage unit that is connected to the power supply unit and stores the time during which power is supplied to the power supply unit. The power supply units lb and lc are not shown in the figure, but as in the case of the power supply unit la, the power supply control unit 4, the output current detection unit 5, the detection unit 6, the output current control unit 7, and the conduction time storage Part 10 and 10 Words and Memories, Part 11.

Next, the operation will be described.

In FIG. 6, the temperature storage unit 11 stores how many hours the internal temperature (the ambient temperature of the electrolytic capacitor) of the power supply devices la, lb, and 1c detected by the temperature detector 6 has elapsed.

The monitoring unit 3 reads the values stored in the temperature storage unit 11 and the energization time storage unit 10 from each power supply device la, lb, 1c. The life monitoring unit 3 determines the power of each power supply la, lb, lc based on the read values of the internal power supply 1a, lb, lc and the power-on time of the power supply la, lb, 1c. Estimate the state of deterioration. Here, the life monitoring unit 3 determines that the longer the power supply time of each power supply device 1a, lb, 1c and the higher the internal temperature, the greater the deterioration. When the life monitoring unit 3 determines that a variation has occurred from the estimated deterioration state of each of the power supply units 1 a, lb, and 1 c, the output current control unit 3 reduces the load current of the power supply unit with the greatest deterioration. 7, the output current control unit 7 is controlled so as to increase the load current of the power supply device with little deterioration.

When the inside of the life monitoring unit 3 is a ° C and the energization time is b hours, the life monitoring unit 3 uses the deterioration information file stored in advance in the deterioration condition storage unit to calculate the electronic temperature corresponding to a ° C and b hours. A configuration may be adopted in which deterioration information (for example, 10 ° / ₀ deterioration) of parts is taken out and the deterioration state of each power supply device la, lb, 1c is estimated.

The life monitoring unit 3 calculates the maximum value of the obtained deterioration state of each power supply device la, lb, 1 c (for example, 2〇 The average value (for example, 15% deterioration) of the minimum value (for example, 10% deterioration) and the minimum value (for example, 15% deterioration) are obtained, and this is set as the deterioration reference value. From this deterioration reference value, it is determined whether the deterioration is large or small.

The life monitoring unit 3 uses the load current (output current) of each power supply la, lb, lc based on the output current file registered in advance to make the deterioration state of each power supply la, lb, 1c the same. Ask for. For example, the output current a, which has been degraded by 10%, is increased until the output current b, which is equal to the degradation reference (15%), is increased. Decrease the output current until the output current reaches b. According to this embodiment, since the deterioration state between the power supply devices 1a, lb, and lc can be made the same, the life between the power supply devices la, lb, and 1c can be made substantially the same, The overall length of the electronic device 8 can be increased.

In the above-described embodiment, the output current control unit 7 is configured by the conduction time storage unit 10 and the storage unit 11 in order to estimate the deterioration of each power supply from the conduction time of each power supply and the inside. As shown in FIG. 7, an output current control unit 7 is added to a conduction time storage unit 10 and a storage unit 11, and the output current of the power supply is detected. The current storage unit 12 may be provided. According to this configuration, the monitoring unit 3 determines that the longer the energizing time, the larger the internal ¾g, and the lower the output current value, the greater the deterioration. Since the deterioration of each power supply can be estimated from ag and the output current value, the same effect as in the above embodiment can be obtained.

In addition, as shown in FIG. 8, the output current control unit 7 may be configured by a conduction time storage unit 10 and an output current storage unit 12. According to this configuration, the life monitoring unit 3 determines that the longer the energizing time and the lower the output current value, the greater the deterioration, and determines the deterioration of each power source from the energizing time and output current value of each power source. Can be estimated, and the same effect as in the above embodiment can be obtained. A third embodiment of the life control device for a parallel redundant power supply according to the present invention will be described. FIG. 9 is a block diagram showing a parallel redundancy power supply life control device according to Embodiment 3 of the present invention.

In FIG. 9, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and 13 denotes a deterioration monitor that displays the deterioration state of each of the power supply units la, lb, and 1c by the life monitoring unit 3. It is.

Next, the operation will be described. In FIG. 9, the same or corresponding parts as in FIG. 1 perform the same operations. The life monitoring unit 3 transfers to the deterioration display unit 13 deterioration information in which the deterioration state of each of the power supply units l a, l b, and 1 c is estimated. The deterioration display section 13 digitally displays the transmitted deterioration information. Here, the deterioration information may be, for example, numerical information indicating the deterioration frequency JS, or may be information based on a message indicating the deterioration state. Since the display on the deterioration display unit 13 allows the worker (user) to know the deterioration state of each power supply, it is possible to easily judge when to replace the power supplies la, lb, and 1c. Therefore, it is possible to reliably replace the power supply device before it breaks down.

Although the deterioration display is displayed digitally here, a similar effect can be obtained even with a display device that can be judged by humans by turning on a color-coded lamp or a semiconductor display device such as an LED.

Further, the deterioration display section 13 may be provided for each power supply unit, or one deterioration display section 13 may collectively display deterioration information of a plurality of power supply units or switch and display the deterioration information. Is also good.

In the above embodiment, the state of deterioration is displayed irrespective of the replacement time, but when the replacement time is reached, information indicating the replacement time (for example, a message saying that it is time to replace) is displayed. You may comprise so that it may display. Specifically, the life monitoring unit 3 estimates the deterioration state of each power supply, and the deterioration state exceeds a predetermined deterioration reference value of the power supply. The display unit 13 displays the transferred exchange time information. 1 A description will be given of a fourth embodiment of the life control device for a parallel redundant power supply of the present invention. FIG. 10 is a block diagram showing a life controlling device for a parallel redundant power supply according to Embodiment 4 of the present invention.

In FIG. 10, the same reference numerals as those in FIG. 7 denote the same or corresponding parts, and 14 is connected to the life monitoring unit 3, and the cooling capacity is made variable by a control signal to cool each of the power supply units 1a, lb, lc. It is a variable rejection device that performs cooling and can increase or decrease the frequency of cooling fan rotation.

Next, the operation will be described. In FIG. 10, the same or corresponding parts as in FIG. 7 perform the same operations. The service life monitoring unit 3 judges the deterioration MS of the power supply la, lb, 1c from the estimated value of the deterioration state of each power supply device la, lb, and 1 c, and the cooling fan of the variable cooling device 14 of the power supply device whose deterioration progresses at a high rate. By increasing the number of rotations of the power supply, the deterioration progress speed of the power supply is slowed. Although the variable cooling device 14 has been described as being capable of increasing or decreasing the number of cooling fan rotations, any device that can control the cooling effect of the power supply device may be used. For example, a semiconductor cooling device using the Peltier effect is used. Alternatively, the cooling effect may be controlled to increase or decrease.

Fifth Embodiment A life control device for a parallel redundant power supply according to a fifth embodiment of the present invention will be described. FIG. 11 is a professional / request diagram showing a life control device for a parallel redundant power supply according to Embodiment 5 of the present invention.

In FIG. 11, the same reference numerals as those in FIG. 7 denote the same or corresponding parts, and reference numeral 15 denotes a life monitoring unit 3, which is a notification device for reporting the deterioration state of each of the power supply devices 1a, lb, and 1c.

Next, the operation will be described. In FIG. 11, the same or corresponding parts as in FIG. 7 perform the same operations. The life monitoring unit 3 transfers the deterioration information, which estimates the deterioration state of each power supply device la, lb, 1c, to the notifying device 15 _{0 The} notifying device 15 sends the sent deterioration information to the outside as voice or document message .

The notification device 15 is connected to, for example, a remote life monitoring unit 3 by wire or wirelessly. 丄

Or a plurality of units may be provided.

Claims

The scope of the claims

1. In a power supply unit for supplying power from a plurality of power supply units (1a) to (; Lc) to a common load (2), ¾® detection means (6) for detecting an internal temperature of each power supply unit; Output current control means (5) for controlling the output current of each power supply; and when the internal temperature varies between the power supplies, the output current of the power supply having a higher internal temperature is reduced, while A power supply lifespan control means, comprising: lifespan monitoring means (3) for increasing the output current of the power supply having a low temperature and making the internal temperatures of the plurality of power supplies substantially uniform. .

2. The OT device of claim 1, wherein the configuration of the power supply device is a parallel redundant system.

3. In a power supply unit that supplies power from a plurality of power supply units to a common load, a storage unit (11) for storing an internal temperature of each power supply unit, and an energization time storage unit for storing an energization time of each power supply unit. (10), output current control means (7) for controlling the output current of each power supply device, the inside of each power supply device read from the ¾S storage means (11), and the upper E power supply time storage means (10) Estimate the deterioration status of multiple power supply units based on the power-on time of each power supply unit read from the power supply unit, and when the deterioration state of each power supply unit varies, reduce the output current of the power supply unit with the most deterioration. On the other hand, a life control device for a power supply device, comprising monitoring means (3) for increasing the output current of the power supply device with little deterioration and making the deterioration states of the plurality of power supply devices substantially uniform.

4. In a power supply that supplies power from multiple power supplies to a common load, inside each power supply: as storage means (for storing the ID and energization time for each power supply) (10), output current storage and means for storing the output current value of each power supply unit (12); output current control means (7) for controlling the output current of each power supply unit; Of each power supply read from (11) Based on the internal temperature, the power supply time read from the power supply time storage means (10) and the output current value of each power supply read from the output current storage means (12), a plurality of power supply apparatuses are provided. Estimate the state of deterioration of the power supply, and when the state of deterioration among the power supply units varies, decrease the output current of the power supply unit, and increase the output current of the power supply unit with less deterioration. A power supply life device comprising: a life monitoring means (3) for making the deterioration state of a plurality of power supply devices substantially uniform.

5. In a power supply unit that supplies power to a common load from a plurality of power supply units, an output current storage unit (12) that stores an output current value of each power supply unit, and a conduction time of each power supply unit is remembered. A power supply time storage means (10), an output current control means (7) for controlling an output current of each power supply, an output current value of each power supply read from the output current storage means (12), E Estimate the state of deterioration of multiple power supplies based on the power-on time of each power supply read from the E® power time storage means (10). Life monitoring means (3) for reducing the output current of a power supply having a large power supply and increasing the output current of a power supply having a small deterioration so as to make the deterioration state of a plurality of power supplies almost uniform.電源 Control device of power supply.

6. The life monitoring means (3) transfers information on the estimated deterioration state of the plurality of power supply units to the deterioration display means (13), and the deterioration display means displays the transferred deterioration state. Life control of the power supply device according to any one of claims 3 to 5

7. The service life monitoring means (3) estimates the deterioration status of multiple power supply units, and if the deterioration status exceeds a predetermined power supply deterioration reference value, degrades the information indicating the time to replace the power supply unit. The life control device for a power supply device according to any one of claims 3 to 5, wherein the deterioration display means displays the transferred replacement time information in the display means (13).