JPH01199423A - Aging device of electrolytic condenser - Google Patents

Abstract

PURPOSE:To enable the efficient and effective aging process to be performed by a method wherein a power supply generating an intermittent aging output with periodicity and a voltage controller raising the lower limit value of the aging output from the power supply corresponding to the lapse of aging time are provided. CONSTITUTION:A power supply 2 generating an intermittent aging output with periodicity as well as a voltage controller 4 raising the lower limit value of the aging output from the power supply 2 corresponding to the lapse of aging time are provided. For example, an electrolytic condenser 6 is used as the said voltage controller 4 on which multiple parts connecting terminals 10a, 10b are provided on one terminal side through the intermediary of multiple diodes 8 for preventing reverse current and then electrolytic condensers 121-12N in the same rating for performing the aging process as the final processing after manufacture are connected between respective connecting terminals 10a, 10b. Finally, the limit voltage VL of the pulse voltage VP set up at frequency of 1kHz and duty ratio of 1/2 is raised by charging the electrolytic condenser 6 to perform the aging of the electrolytic condensers 121-12N.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is used for aging treatment of electrolytic capacitors in order to repair the chemical oxide film on the anode side electrode, stabilize and equalize the characteristics as a final treatment for product production. It relates to an aging device.

[Conventional technology]

Generally, an electrolytic capacitor consists of an anode that has a dielectric oxide film on its surface and a cathode that does not have a dielectric oxide film, which are placed facing each other with a separator interposed between the two electrodes, and are impregnated with electrolyte and sealed in an exterior case. This is what I did. Etched aluminum foil or the like is used for both the anode and the cathode, and a dielectric oxide film is further formed on the surface of the anode by chemical conversion treatment. These anodes and cathodes are connected to internal leads by stitching, cut to a predetermined length and width, and then wound as a cylindrical electrolytic capacitor element with a separator in between. After impregnation, it is sealed in an outer case.

An anode that has undergone such mechanical processing is subjected to mechanical stress due to connection, cutting, winding, etc. of internal leads, resulting in exposure of the bare metal or damage to the dielectric oxide film. For anodes with such defects, it is not possible to stabilize and make the characteristics uniform if the self-repairing action, which is a characteristic feature of electrolytic capacitors, is left alone.As a final treatment to compensate for this, dielectric Aging treatment, which is a property stabilization treatment and reconversion treatment, is performed to repair the defective portions of the oxide film.

[Problem to be solved by the invention]

Conventionally, aging processing uses a resistor and constant current element as a current control element to set the aging voltage and aging current corresponding to the electrolytic capacitor's rating (low voltage, medium voltage, and high voltage), the type of electrolyte, the capacity, etc. , is carried out by continuous voltage and current. In other words, since electrolytic capacitors before aging have variations in characteristics, it is desirable to apply aging labor to each individual electrolytic capacitor that corresponds to the variations.However, at the production level, It is very difficult to change the aging input.

Furthermore, if the aging input is increased in order to speed up the aging time, the electrolytic capacitor may generate heat due to variations in characteristics and internal pressure may increase due to rapid chemical changes, which may lead to breakdown. Therefore, on the production line, we standardized the current control elements that correspond to multiple electrolytic capacitors, and in order to improve the safety of the aging process, we started with low voltage and low current, and increased the voltage and current as time passed. However, the aging process tended to take a long time.

Conventionally, as an aging method that shortens the aging treatment time, there is Japanese Patent Publication No. 62-56648 entitled ``Method for Aging Electrolytic Capacitors''. This aging method is unique in that aging treatment is performed intermittently and discharge treatment is performed, but the aging treatment itself uses continuous voltage and current, so it still has the disadvantage that the aging treatment time is long. be.

For this reason, the applicant attempted to optimize the aging process by controlling the electrical factors of the aging input to the electrolytic capacitor, thereby shortening the aging time and improving the reconstitution characteristics such as product uniformity and stability. We proposed an aging method for electrolytic capacitors.

Therefore, the purpose of this invention is to realize efficient and effective aging processing by controlling the aging output in accordance with the leakage current characteristics, since the aging characteristics of electrolytic capacitors are closely related to the leakage current. The aim is to provide an aging device that

Another object of the present invention is to focus on the fact that the leakage current reduction characteristics associated with aging treatment are similar to the charging characteristics of electrolytic capacitors, and to achieve efficient aging treatment by controlling voltage with electrolytic capacitors. Our goal is to provide an aging device that achieves this.

[Means to solve the problem]

As shown in FIG. 1, the electrolytic capacitor aging device of the present invention includes a power supply 2 that generates an intermittent aging output with periodicity, and a lower limit value of the aging output from this power supply 2 that increases as the aging time elapses. It is equipped with a voltage control means (voltage control section 4) for controlling the voltage.

Furthermore, the aging device for electrolytic capacitors of this invention includes:
As shown in FIG. 1, an electrolytic capacitor 6 is used as the voltage control means (voltage control section 4).

[For production]

Electrolytic capacitors 12, ~1 to be aged from power source 2
When an intermittent aging output with periodicity is added to 2N, an aging current having a periodic and intermittent level flows through the electrolytic capacitors 121 to 12s in accordance with the aging output. The upper limit of the aging output is the aging operation period, and the lower limit thereof is the rest period. In other words, the electrolytic capacitor 12. ~12m, heat is generated in the operating section and cooling is performed in the rest section. That is, as a result of alternating heat generation and cooling, and a chemical conversion reaction, aging can be started without abnormal heat generation or thermal accumulation.

By the way, when looking at the leakage current characteristics of such aging treatment, a considerably large leakage current flows at the beginning of aging due to defects in the dielectric oxide film, but as the aging treatment time progresses, the value decreases. It shifts to a steady value.

That is, when looking at this in terms of internal resistance, the resistance value is low at the beginning of aging and is close to a short circuit state, but the resistance value increases as the dielectric oxide film is repaired. When looking at this in terms of voltage, the terminal voltage tends to increase due to the accumulation of charge in the capacitor layer, contrary to the leakage current characteristics. In other words, repairing the dielectric oxide film also means that the withstand voltage necessary for an electrolytic capacitor is achieved.

Therefore, for intermittent aging output with periodicity,
The voltage control means (voltage control section 4) increases the lower limit value as the aging time elapses, and finally makes the voltage constant.

Therefore, as the leakage current decreases from the start of aging, the lower limit value of the periodic intermittent aging output is increased according to the aging time. Efficient and effective aging processing can be achieved by accelerating startup using the output and increasing the effective value of the aging output as the aging processing progresses.

If the electrolytic capacitor 6 is used as the voltage control means (voltage control section 4), the electrolytic capacitor 12 to be aged
．． ~12. Due to its leakage current reduction characteristics, electrolytic capacitor 6
Voltage control can be performed in accordance with the charging characteristics of the battery, and efficient and effective aging processing can be achieved with an extremely simple configuration.

〔Example〕

FIG. 1 shows an embodiment of an electrolytic capacitor aging device of the present invention.

The power supply 2 is an aging power supply that generates an intermittent aging output with periodicity such as voltage, current, frequency, duty ratio, etc., and can arbitrarily control the electrical factors of the aging process of the electrolytic capacitor. It is constructed with a pulsed power supply whose electrical factors are controlled.

A voltage control section 4 is installed at the output section of the power supply 2 to increase the lower limit value of the aging output from the power supply 2 as the aging time elapses and shift it to the upper limit value. An electrolytic capacitor 6 is installed as a capacitor. The voltage control unit 4 increases the lower limit value of the aging output from the power source 2 as the aging time elapses,
The electrolytic capacitor 6 may be configured by a circuit means such as a programmable power supply circuit having a function of shifting to the upper limit value, and the electrolytic capacitor 6 is only one example thereof.

The electrolytic capacitor 6 is connected to a plurality of pairs of connection terminals 1 via a plurality of diodes 8 for preventing backflow on one terminal side.
Electrolytic capacitors 121 and 12 of the same rating are provided between each connection terminal 10a and 10b for aging treatment as a final treatment after manufacturing.
□ ...12N is connected.

In this aging device, a case will be described in which a pulse voltage vP shown in A in FIG. 2 is used as an intermittent aging output having periodicity.

The pulse voltage ■, as the aging output applied from the power supply 2, has a specific repetition frequency f, and the upper limit voltage vH (〉O
), the lower limit voltage VL=O as the lower limit level of the aging output at time T2, and the duty ratio r is Tl / (TI
+Tt) When the aging process is performed using such a pulse voltage ■P, each electrolytic capacitor 12+ to 12
s is energized at time T, and cut off at time T2.
Heat generation occurs at , and cooling occurs at time T, and the repetition depends on the frequency f and the heat generation time on the duty ratio r.

Electrical factors such as frequency f, voltage V, vL, and duty ratio r are adjusted on the power supply 2 side, and are set according to the nominal values of the electrolytic capacitors 121 to 1214.

The aging process depends on the amount of charge to be supplied, and the shortening of the aging time is related to how quickly the amount of charge can be supplied. Therefore, as shown in B in FIG. By controlling the lower limit voltage ■1, the pulse voltage V,
The lower limit voltage vL of is set to the initial value O, and the lower limit voltage ■L, which arrives alternately with the upper limit voltage vH, is gradually increased over time to approach the upper limit voltage vH. Such an increase in the lower limit value (■) is caused by the electrolytic capacitor 12. It is effective to correspond to the aging reaction of ~12N and to correspond to the increase in the withstand pressure.

Therefore, according to such aging processing, at the beginning of aging, a pulse current flows through the electrolytic capacitors 12+ to 12g by the pulse voltage vr, heat generation and cooling are performed alternately and at optimal time intervals, and the rise time of reconstitution is reduced. The time will be shortened. When continuous DC voltage is used, continuous heat generation occurs, so conventionally it was necessary to suppress the initial aging voltage and current and increase the voltage and current in stages. If the aging output is made intermittent and periodic as in the embodiment, even if the final aging voltage (VW) is applied from the initial stage, there will be no abnormal leakage current, heat generation, or thermal accumulation. It improves aging efficiency and makes it possible to shorten the aging process.

Then, as the leakage current decreases, by increasing the lower limit voltage (■) of the pulse voltage (2), the effective value of the aging output for the electrolytic capacitors 12t to 12.4 is increased, resulting in efficient and effective aging. Processing is accomplished.

The aging process using such a pulse voltage VP is performed by effectively varying the current, and the maximum current that contributes to aging is larger than the effective current, so that a debug function for defective products is realized. In other words, the electrolytic capacitors 12+ to 12 that undergo aging treatment have uneven individual characteristics, and in extreme cases, even if some are close to defective, the current will be concentrated in the defective electrolytic capacitor. flows, causing destruction of the electrolytic capacitor.
There is no risk that the aging process of other normal electrolytic capacitors will be insufficient, and the reliability of the aging process can be improved by controlling the lower limit voltage using intermittent aging output with periodicity such as pulse voltage. safety and security are further improved.

If the electrolytic capacitor 6 is used in the voltage control section 4 as in the embodiment, the electrolytic capacitor 12 to be aged.
The charging characteristics of the electrolytic capacitor 6 can be made to correspond to the leakage current reduction characteristics of -12N, and voltage control optimal for aging processing can be realized with an extremely simple configuration.

In addition, the lower limit voltage ■ of the pulse voltage V by the voltage control unit 4
One way to increase the value of The voltage may be divided and raised at a constant voltage or stepwise or continuously.

In addition, in the example, a case was explained in which a pulse voltage ■ was used as an intermittent aging output with periodicity, but as an intermittent aging output with periodicity, a voltage or current of an AC half-wave rectified waveform, a triangular wave voltage, etc. , electric current may be used.

Furthermore, the electrolytic capacitor 6 serving as the voltage control section 4 can be replaced by an aging electrolytic capacitor.

〔Experimental result〕

For an electrolytic capacitor with a rated voltage of 400 V and a capacitance of 47 μF, the aging output is set to a frequency of 1 kHz, a duty ratio of 1/2, and an upper limit voltage vN of 425 ■.The lower limit voltage vL of the pulse voltage VP is increased by charging the electrolytic capacitor 6. Figure 3 shows the aging results when a continuous voltage of 425 cm is applied and when a continuous voltage of 425 cm is used. terminal voltage,
Z indicates the temperature of the electrolytic capacitor element corresponding to X.

As is clear from this result, compared to the case where a continuous voltage is used, when the pulse voltage vP is used as an intermittent aging output with periodicity and its lower limit voltage ■ is increased, the electrolytic capacitor The terminal voltage rises quickly,
It can be seen that the aging processing time is reduced to about 1/4.

〔Effect of the invention〕

As explained above, according to the present invention, when an intermittent aging output with periodicity is applied to an electrolytic capacitor to be aged, and the lower limit value thereof is increased as the aging time elapses, heat generation and cooling can be reduced. The aging process progresses through alternating repetitions, and the lower limit value increases as the aging progresses, so in the end, the same effect as when constant voltage is used for aging is obtained, and the rise time of the aging process is reduced. It is possible to optimize the aging process by shortening and aging output according to the aging characteristics, and it is possible to produce products with improved uniformity and stability and excellent reliability.

Further, according to the present invention, by using an electrolytic capacitor as the voltage control means, optimization of aging characteristics can be realized with an extremely simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the aging device for electrolytic capacitors of the present invention, FIG. 2 is a diagram showing the aging output of the aging device shown in FIG. 1, and FIG. 3 is a diagram showing the aging device of the present invention and the conventional aging device. FIG. 3 is a diagram showing aging characteristics when an aging device is used. 2...Power supply 4...Voltage control section (voltage control means) 6...Electrolytic capacitor

Claims (2)

[Claims] (1) An aging device for an electrolytic capacitor, comprising a power source that generates an intermittent aging output with periodicity, and a voltage control means that increases the lower limit value of the aging output from the power source as the aging time elapses. (2) The electrolytic capacitor aging device according to claim 1, wherein an electrolytic capacitor is used as the voltage control means.