JP2001327162A - Power supply unit and aluminum electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect or predict the service life of a power supply with high precision without causing a power supply unit circuit to be complicated or expensive. SOLUTION: An aluminum electrolytic capacitor Z including at least a first and a second capacitor capacitances C4, C44 in the same case 74 is built in. The first capacitor capacitance C4 is used as a capacitor 4 for power supply output generation which smoothes and outputs voltage after rectification to generate power supply output and the second capacitor capacitance C44 is used as a service life detecting capacitor 44 detecting or predicting the service life of the power supply unit in connection with the capacitor for power supply output generation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device having a built-in aluminum electrolytic capacitor for smoothing and outputting a rectified voltage in order to generate a power supply output, and more particularly to a power supply device having a built-in aluminum electrolytic capacitor. The present invention relates to a power supply device configured to detect or predict the life of the power supply device.

[0002]

2. Description of the Related Art Generally, in such a power supply device, the life of the aluminum electrolytic capacitor due to the deterioration of its capacity is as follows.
The life of the power supply is treated as it is.
The applicant of the present application has disclosed Japanese Patent Application Laid-Open No. H4-161057 (Japanese Patent No. 290057) as a device for detecting the life of a power supply device due to such capacity deterioration of an aluminum electrolytic capacitor.
No. 9).

In the power supply device according to this proposal, the deterioration of the capacity of the aluminum electrolytic capacitor (power supply output generation capacitor) is based on the influence of the ambient temperature and the like. Aluminum electrolytic capacitors (capacitors for life detection) are placed close to each other, and the ambient temperature conditions of the capacitors are set equal.
The deterioration of the capacity of the power output generating capacitor is detected from the degree of the capacity deterioration of the life detecting capacitor, whereby the life of the power supply device can be detected.

[0004]

In the case of the power supply device proposed above, by arranging the two capacitors close to each other, the life can be detected on the premise that the respective capacity deterioration times coincide with each other according to Arrhenius' law. The following problems are pointed out because both capacitors are separate structures.

(1) Both capacitors cannot be arranged close to each other due to restrictions on the arrangement of components in the power supply device. As a result, the ambient temperature conditions of both capacitors are different, so that it is difficult or impossible to detect the life with high accuracy.

(2) There is a slight difference in the ambient temperature between the upper end portion and the lower end portion of the capacitor due to the phenomenon that warm air accumulates in the upper space. Therefore, even if the two capacitors can be placed close to each other without any restrictions on the component placement in the power supply, if the height dimensions differ between the two capacitors, the ambient temperature conditions will differ, and the life detection The accuracy of is reduced.

(3) Ambient temperature between both capacitors is measured by an ambient temperature measuring sensor, and the difference in the ambient temperature is electrically corrected based on the sensor output, whereby highly accurate life detection can be performed. , But in these cases,
Since the correction value changes depending on the change in the mounting posture of both capacitors, it is necessary to consider the detection of the mounting posture of both capacitors in the correction value. Therefore, the mounting of the ambient temperature measurement sensor, a correction circuit for the correction, a detection circuit of the mounting posture, and the like are required, and the power supply circuit becomes complicated and expensive.

(4) The deterioration of the capacity of the aluminum electrolytic capacitor is affected not only by the ambient temperature of the aluminum electrolytic capacitor, but also by the temperature due to self-heating based on the ripple current flowing through the capacitor. In this case, the life detecting capacitor is set to have a small and constant ripple current flowing therethrough so that the self-heating temperature is almost negligible, whereas the ripple current flowing to the power supply output generating capacitor is large and the Since the temperature varies depending on the load of the apparatus, the self-heating temperature is large and fluctuates.

Therefore, even if the mounting postures of both capacitors are fixed and these two capacitors are arranged close to each other and their ambient temperature conditions are equal, as long as both capacitors are of a separate structure, the power supply output generating capacitor is not used. While the capacity is deteriorated by the self-heating temperature in addition to the ambient temperature, the life detecting capacitor cannot take in the self-heating temperature of the power supply output generating capacitor as the ambient temperature.

As a result, a difference occurs between the two capacitors in the temperature affecting the capacity deterioration, and the accuracy of life detection is deteriorated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to accurately detect or predict the power supply life without causing the power supply circuit to become complicated and expensive.

[0012]

A first power supply unit according to the present invention includes an aluminum electrolytic capacitor having at least first and second capacitor capacitances in a same case,
The first capacitor capacity is used as a power output generation capacitor for smoothing and outputting a rectified voltage to generate a power output, and the second capacitor capacity is used to detect or predict the life of the power supply device related to the power output generation capacitor. It is used as a life detecting capacitor.

Further, the second and third power supply devices of the present invention are characterized in that one of the individual anodes in an aluminum electrolytic capacitor having at least two individual anodes and a common cathode opposed to the individual anodes in the same case is provided. A first capacitor capacitance formed between the common cathode and the common cathode is used as a power output generation capacitor for smoothing and outputting a rectified voltage to generate a power output, and formed between the other individual anode and the common cathode. The second capacitor capacity is used as a life detecting capacitor for detecting or predicting the life of the power supply device related to the power output generating capacitor.

According to the first to third power supply devices of the present invention, in an aluminum electrolytic capacitor having two capacitor capacities in the same case, one of the capacitor capacities is used as a power output generating capacitor, and the other capacitor capacity is used for life detection. Since the two capacitors are integrated, the two separate aluminum electrolytic capacitors are used as power supply output generating capacitors and the other is used as a life detecting capacitor. Unlike the separate capacitor type, ・ As the ambient temperature conditions of both capacitors match, highly accurate life detection or prediction is possible.

Even if there is a slight difference in the ambient temperature between the upper end portion and the lower end portion of the capacitor due to the phenomenon that warm air accumulates in the upper space, it is possible to detect or predict the life of the capacitor with high accuracy.

Even if the mounting posture of the capacitor is changed, electrical correction processing or the like due to the change is unnecessary.
There is no need for a temperature measurement sensor for correction, mounting thereof, a correction circuit for the correction, a detection circuit for the mounting posture, and the like, and the power supply circuit can be simplified and reduced in cost.

Unlike the conventional configuration in which the two capacitors are separated from each other, there is no difference between the power supply output generating capacitor and the life detecting capacitor in the temperature affecting the capacity deterioration. Accurate life detection is possible.

As described above, in the first to third embodiments of the present invention, there is provided a power supply device capable of accurately detecting or predicting the life of the power supply without complicating the power supply circuit and increasing the price. be able to.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments showing details of the present invention.

The power supply according to the present embodiment will be described as applied to a switching power supply, but the present invention is not limited to this.

In the power supply device of the present embodiment, if the power supply device includes an aluminum electrolytic capacitor as a power supply output generation capacitor for smoothing a rectified voltage for generating a power supply output, all the power supply devices are used. included.

Hereinafter, a specific description will be given.

FIG. 1 is an electric circuit diagram of a power supply device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG.
4 is a timing chart for explaining the operation thereof, and FIGS. 4 to 6 are diagrams for explaining the aluminum electrolytic capacitor of FIG.

The power supply shown in the figure comprises a constant voltage power supply circuit X,
And a life detecting circuit Y.

The constant voltage power supply circuit X has a power supply output generation capacitor 4 for smoothing a rectified output obtained by rectifying an alternating current by a rectifier circuit 3 to generate a power supply output. Rectifier circuit 4 for detecting the life of the power supply device
3 has a life detecting capacitor 44 for smoothing the rectified output obtained by rectification.

The smoothing capacitors 4 and 44 are constituted by aluminum electrolytic capacitors Z.

[0027] The aluminum electrolytic capacitor Z is at least two individual anode Z _+1, and Z _+2, wherein the two single anode Z _+1, common cathode Z opposite to the Z ₊₂ in the same casing _- Yes and and, common cathode Z and the first individual anode Z _{+1 -} constitute a first capacitance C4 between the common cathode Z and second individual anode Z _{+2 -} constituting the second capacitance C44 between the I do.

The first capacitor capacitance C4 functions as the power supply output generating capacitor 4, and the second capacitor capacitance C4
4 functions as a life detecting capacitor 44.

The detailed structure of the aluminum electrolytic capacitor Z is as follows.
This will be described later with reference to FIGS.

The constant voltage power supply circuit X in FIG. 1 will be described.

1 is an AC input, 2 is a noise filter (NF), and 3 is a rectifier circuit such as a bridge rectifier circuit.

Reference numeral 4 denotes a power supply output generating capacitor constituted by the first capacitor C4 in the aluminum electrolytic capacitor Z described above.

Reference numeral 5 denotes a transformer whose input winding 5a
, A switching transistor 6 as a switching element is connected in series. Reference numeral 7 denotes a starting resistor of the switching transistor 6, and reference numeral 8 denotes a resistor connected in series to the switching transistor 6.

Reference numeral 9 denotes a control circuit which is connected to the control winding 5b of the transformer 5 and controls the ON / OFF time ratio of the switching transistor 6 according to a detection output of an output voltage detection circuit described later. The control circuit 9 includes, for example, the limiting resistor 1 connected to the base of the switching transistor 6.
0, a diode 11 interposed between the resistor 10 and the control winding 5b, a speed-up capacitor 12 connected in parallel with the diode 11, and a control transistor 1 connected to the base of the switching transistor 6.
3. Control winding 5 including resistors 14, 15 and diode 16.
b, a capacitor 17 connected in parallel to b to form a series body;
And a phototransistor 18 interposed between the resistor 15 and the connection point between the diode 16 and the capacitor 17.

Reference numeral 19 denotes a rectifying diode connected to the output winding 5c of the transformer 5, and reference numeral 20 denotes a smoothing capacitor. Reference numeral 21 denotes an output voltage detection circuit connected in parallel to the smoothing capacitor 20.
The voltage dividing circuit 22 is formed of a series body of a resistor 24 and a variable resistor 26. The detection / comparison circuit 23 includes a series body including a resistor 27, a light-emitting diode 29 that forms a photocoupler 28 with the phototransistor 18, and a shunt regulator 30 that compares the internal reference voltage with the divided voltage of the voltage dividing circuit 22. , And a capacitor 31 inserted and connected between the cathode and reference of the shunt regulator 30. 32A and 32B are a pair of output terminals, and 33 is a load connected between the output terminals 32A and 32B. A series body of a current limiting resistor 34 and an operation display light emitting element 35 is connected in parallel between the output terminals 32A and 32B.

The operation of the constant voltage power supply circuit X will be described.

When the AC input voltage is converted into DC by the rectifier circuit 3 and the power supply output generating capacitor 4, and a base current flows through the switching transistor 6 through the starting resistor 7, the transistor 6 starts to turn on. The input winding 5a of the transformer 5 is excited, and a larger current is supplied from the control winding 5b to the base of the switching transistor 6 through the speed-up capacitor 12, the diode 11, and the limiting resistor 10, and the transistor 6 is turned on. become. Speed-up capacitor 12
Is for supplying a steep current to the base of the transistor 6 in order to accelerate the turn-on of the switching transistor 6, and has an effect of reducing the loss of the transistor 6 during the switching operation.

When the switching transistor 6 is turned on, the collector current of the switching transistor 6 is increased by the characteristic determined by the inductance of the input winding 5a of the transformer 5, but the voltage across the resistor 8 is also increased. Since the base current is supplied to the control transistor 13, the transistor 13 is turned on. For this reason, the base current of the switching transistor 6 stops flowing, and the transistor 6 is turned off. By repeating the ON / OFF switching operation of the switching transistor 6, the DC-converted voltage is converted into AC and output to the output winding 5c of the transformer 5. Output winding 5c
Is output to the load 33 as the output voltage V0 and the output current I0 by the rectifier diode 19 and the smoothing capacitor 20.

In the output voltage detecting circuit 21, the shunt regulator 30 compares the potential at the voltage dividing point of the voltage dividing circuit 22 with the internal reference voltage, and applies a comparison difference signal to the base of the control transistor 13 via the photocoupler 28. As a result, the switching operation of the switching transistor 6 is controlled. That is, when the divided voltage becomes higher than the internal reference voltage of the shunt regulator 30, the shunt regulator 30 conducts, the light emitting diode 29 emits light, and the phototransistor 18 conducts. Thus, the ON time of the switching transistor 6 is reduced, and the output voltage V0 is kept constant.

On the other hand, when the divided voltage is going to be lower than the internal reference voltage, the shunt regulator 30 is non-conductive and the light emitting diode 29 does not emit light. Becomes longer, and the output voltage V0 is kept constant.

The life detecting circuit Y will be described.

Reference numeral 43 denotes a rectifier circuit.

44 is the aluminum electrolytic capacitor Z described above.
Is a life detecting capacitor constituted by the second capacitor C44.

45, a resistor, 46 is a Zener diode, 47 is a reference voltage generating circuit, and 48 and 49 are resistors. These constitute a voltage dividing circuit 50. 51 is
Comparison circuit 5 to which divided potential V2 and reference potential V3 are applied
It is one. The voltage detection circuit 56 is composed of blocks surrounded by broken lines. 52 is a resistor, 53 is a control transistor, and 54 is a light emitting diode for life indication. The comparison difference signal of the comparison circuit 51 is applied to the base of the control transistor 53 via the resistor 52, whereby the switching operation of the switching transistor 53 is controlled.

The operation of the life detecting circuit Y will be described.

The AC input voltage from the AC input power supply 1 is passed through a noise filter 2 for removing noise to rectifier circuits 3 and 4.
3 and a power supply output generating capacitor 4 respectively.
Is converted to DC by the life detecting capacitor 44.

The constant voltage power supply circuit X including the power supply output generating capacitor 4 operates in the same manner as that described in the conventional example and is not affected by the fluctuation of the input voltage, so that a constant output voltage is applied to the output terminals 32A and 32. The output voltage V0 is applied to the operation display light emitting element 34 via the luminance adjusting resistor 34, and the light emitting element 3
4 emits light at a predetermined luminance, thereby indicating that the constant voltage power supply circuit X is operating.

On the other hand, when the waveform of the output voltage V1 smoothed by the life detecting capacitor 44 after the AC input voltage is full-wave rectified by the rectifier circuit 43 is as shown by a solid line in FIG. Has a waveform of the divided potential V2 of the voltage dividing circuit 50 connected in parallel to the output voltage V1. Further, the divided potential V2 is compared with the reference potential V3 of the reference voltage generation circuit 47 in the comparison circuit 51, and since V2> V3 at this time, the output voltage V4 of the comparison circuit 51 is held at the L level, and The transistor 53 is kept off. Therefore, the light-emitting element 5 for life indication
4 is in a light-off state.

On the other hand, when the initial capacitance C.mu.F is gradually reduced as the life detecting capacitor 44 deteriorates due to the surrounding environmental conditions, the waveforms of the output voltage V1 and the divided potential V2 are shown in FIG. 3 becomes an attenuation waveform as shown by a virtual line, and when V2 <V3, the comparison circuit 5
1 becomes the H level, and the output voltage V4 becomes H level.
Each time the level becomes the level, the control transistor 53 repeats conduction (ON) and non-conduction (OFF), and the life display light emitting element 54 flashes.

However, in this blinking state, as the deterioration of the life detecting capacitor 44 progresses, the period of V2 <V3 becomes longer, and the output voltage V4 of the comparison circuit 51 becomes high.
The level period T4 also becomes longer. Since the blinking cycle of the lifetime display light emitting element 54 is 100 Hz or 120 Hz, which is twice the commercial power supply, the blinking state cannot be visually recognized, and the length of the blinking time of the light emitting element 54 is displayed as a change in luminance. Is done. That is, the life detecting capacitor 44
As the deterioration of the light-emitting element progresses, the luminance of the light-emitting element 54 shifts to become brighter.

However, in this state, only the indication that the life detecting capacitor 44 has deteriorated is displayed, but the life of the constant voltage power supply circuit X is not displayed. Therefore, a method of matching the two will be described below.

First, when the constant voltage power supply circuit X exhibits a predetermined performance, the most important initial capacitance of the power supply output generating capacitor 4 is set to AμF, and the constant voltage power supply circuit X can satisfy the predetermined performance. Assuming that the final capacitance of the power supply output generation capacitor 4 at the end of its life, that is, the lifetime, is BμF, the time T required for the capacitance of the power supply output generation capacitor 4 to change from AμF to BμF at an ambient temperature K ° C. Can be calculated by Arrhenius law.

Similarly, assuming that the initial capacitance of the life detecting capacitor 44 is CμF, T at ambient temperature K ° C.
The capacitance DμF after time can be calculated according to Arrhenius' law.

Further, the waveform of the divided potential V2 when the capacitance of the life detecting capacitor 44 becomes DμF can be easily obtained by calculation or actual measurement.
The signal itself indicates the life time of the power supply circuit X.

Therefore, the flickering cycle is adjusted by adjusting the reference potential V3 of the reference voltage generation circuit 47 and the current flowing therethrough so that the light emitting element 54 attains the predetermined brightness ELux when the capacitance DμF is reached. Is determined by adjusting the current limiting resistor 55, the light emitting element 5
When the luminance of the LED No. 4 becomes ELux, the life time of the constant voltage power supply circuit X is displayed.
The life of the constant voltage power supply circuit X can be easily confirmed.

The structure of the aluminum electrolytic capacitor Z in which the power output generating capacitor 4 and the life detecting capacitor 44 are integrated will be described with reference to FIGS.

FIG. 4 is an external perspective view of the aluminum electrolytic capacitor Z, FIG. 5 is a schematic cross-sectional view of FIG. 4, and FIG.
FIG. 3 is a perspective view showing a wound state of an anode foil, electrolytic paper, a cathode foil and the like indicated by.

As shown in FIG. 4, the aluminum electrolytic capacitor Z shown in the figure has three terminals 71, 72, 73 for the first individual anode, the second individual anode, and the common cathode projecting from the bottom surface of the case 74. It is configured.

5 and 6, reference numeral 75 denotes a cathode foil; 76, a first electrolytic paper; 77, a first anode foil;
Is a second electrolytic paper, and 79 is a second anode foil.

The cathode foil 75 is connected to the terminal 71 by the first anode foil 7.
6 is connected to the terminal 72, and the second anode foil 77 is connected to the terminal 73, respectively.

In the aluminum electrolytic capacitor Z, the cathode foil 75, the first electrolytic paper 76, the first anode foil 77, and the second electrolytic paper 78 start to be wound in this order from the center side in the case 74. With the ends positioned, they are wound in rolls toward the respective winding ends. At the winding end of the first anode foil 77, the winding start end of the second anode foil 79 is located. The cathode foil 75, the first electrolytic paper 7
6, first anode foil 77, second electrolytic paper 78, second anode foil 79
Of each winding start end and each winding end of the
Shown schematically for convenience of illustration.

Aluminum electrolytic capacitor Z having the above configuration
, The terminal 71 and the cathode foil 75 constitute a common cathode, the terminal 72 and the first anode foil 77 constitute a first individual anode, and the terminal 73 and the second anode foil 79 constitute a second individual anode.

The aluminum electrolytic capacitor Z used in the power supply device of the present embodiment has two capacitor capacitances C4 and C44 in the same case 74, and one of the capacitor capacitances C4 is used as the power supply output generating capacitor 4 and the other. Is different from the conventional two-capacitor separate type because the capacitor capacity C44 is a life detecting capacitor 44, and the ambient temperature conditions of both capacitors 4 and 44 match, resulting in high-precision life. Detection or prediction is possible.

Even if the ambient temperature differs between the upper end and lower end of the condenser due to the phenomenon that warm air accumulates in the upper space, the both condensers 4 and 44 have the same ambient temperature. , It is possible to detect or predict the service life with high accuracy.

Even if the mounting posture of the capacitor is changed, it is not necessary to perform an electrical correction process or the like thereby.
There is no need for a temperature measurement sensor for correction, mounting thereof, a correction circuit for the correction, a detection circuit for the mounting posture, and the like, and the power supply circuit can be simplified and reduced in cost.

There is no difference between the two 4 and 44 in the temperature affecting the capacity deterioration, thereby enabling highly accurate life detection.

In the present invention, the life detection circuit Y is provided on the primary side of the transformer. However, as shown in FIG. 7, the life detection circuit Y is provided on the secondary side of the transformer. No problem. The power supply device of FIG. 7 differs from that of FIG. 1 only in the life detection circuit Y, and the other operations are the same. Reference numeral 5d denotes a secondary winding of the transformer, and a life detecting circuit Y is connected to the secondary winding 5d. The aluminum electrolytic capacitor Z is a smoothing capacitor 2 in the constant voltage power circuit X.
0 and a life detecting capacitor 44 of the life detecting circuit Y. The smoothing capacitor 20 also constitutes a power output generation capacitor.

[0068]

According to the present invention, an aluminum electrolytic capacitor having at least two anodes and a cathode opposed to both anodes is built in, and the aluminum electrolytic capacitor is formed between one anode and the cathode. The first capacitor capacitance is used as a power supply output generation capacitor for smoothing and outputting the rectified voltage to generate a power supply output, while the second capacitor capacitance formed between the other anode and cathode is used as the power supply output generation capacitor. Since it is used as a life detection capacitor for detecting or predicting the life of the power supply device related to the power supply device, accurate detection or prediction of the power supply life can be performed without causing the power supply circuit to become complicated and expensive. An enabled power supply device can be provided.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a power supply device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a timing chart for explaining the operation;

FIG. 4 is an external perspective view of the aluminum electrolytic capacitor Z of FIG. 1;

FIG. 5 is a schematic cross-sectional view of FIG.

FIG. 6 is a perspective view showing a wound state of the anode foil, electrolytic paper, cathode foil, and the like shown in FIG. 5;

FIG. 7 is an electric circuit diagram of a power supply device according to another embodiment of the present invention.

[Explanation of symbols]

 X Constant voltage power supply circuit Y Life detection circuit 4 Power output generation capacitor 44 Life detection capacitor Z Aluminum electrolytic capacitor 74 Case 71 to 73 Terminal 75 Cathode foil 76 First electrolytic paper 77 First anode foil 78 Second electrolytic paper 79 No. 2 anode foil C4 1st capacitor capacity C44 2nd capacitor capacity

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) H02M 3/338 H01G 9/00 521 F term (reference) 5E082 AB09 BB03 MM31 PP08 5H730 AA04 AA20 BB43 BB55 CC01 DD02 EE02 EE07 FD01 FD11 FD41 FF19 XX02 XX13 XX22 XX33 XX50

Claims (4)

[Claims] 1. A power supply which includes an aluminum electrolytic capacitor having at least first and second capacitor capacities in a same case, and smoothes and outputs a rectified voltage to generate a power supply output of the first capacitor capacities. A power supply device as the output generation capacitor, wherein the second capacitor capacity is used as a life detection capacitor for detecting or predicting the life of the power supply device related to the power supply output generation capacitor. 2. An aluminum electrolytic capacitor having at least two individual anodes and a common cathode facing both said individual anodes in the same case, wherein one of the individual anodes and the common cathode in the aluminum electrolytic capacitor are connected to each other. The first capacitor formed between them is used as a power output generating capacitor for smoothing and outputting the rectified voltage to generate a power output, while the second capacitor formed between the other individual anode and the common cathode is used. A power supply device, wherein a capacitor capacity is used as a life detection capacitor for detecting or predicting the life of the power supply device related to the power output generation capacitor. 3. A constant voltage power supply circuit having a power supply output generating capacitor for smoothing a rectified output obtained by rectifying an alternating current by a rectifier circuit, and a life span of the power supply device connected in parallel with the constant voltage power supply circuit. A life detecting circuit having a life detecting capacitor for smoothing a rectified output obtained by rectification by a rectifying circuit for detection, wherein at least two individual anodes and a common opposing the two individual anodes are provided in the same case. A first capacitor capacitance formed between one individual anode and a common cathode in an aluminum electrolytic capacitor having a cathode is used as the power output generation capacitor, while the other individual anode and a common cathode in the aluminum electrolytic capacitor are used. A power supply device, wherein a second capacitor capacity formed between the power supply device and the power supply device is used as the life detecting capacitor. 4. An aluminum electrolytic capacitor used in a power supply device for smoothing and outputting a rectified voltage to generate a power supply output, wherein said aluminum electrolytic capacitor faces at least two individual anodes and said both individual anodes in the same case. A first cathode formed between one of the individual anodes and the common cathode, having an anode terminal connected to each individual anode and a cathode terminal connected to the common cathode. The capacitor capacity is used as a power output generation capacitor for smoothing and outputting the rectified voltage, while the second capacitor capacity formed between the other individual anode and the common cathode is related to the power output generation capacitor. Used as a life detecting capacitor for detecting or predicting the life of the power supply device, an anode terminal corresponding to the one individual anode outputs the smoothed output. An aluminum electrolytic capacitor, wherein an anode terminal corresponding to the other individual anode is used as a terminal for outputting the life detection or prediction output.