JPH0722299A - Aging processing circuit for electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide an aging processing circuit for electrolytic capacitor in which the exciting current can be controlled optimally. CONSTITUTION:The aging processing circuit 1 for electrolytic capacitor conducts aging by applying a voltage from an aging power supply 5 to a plurality of electrolytic capacitors Cx1, Cx2,..., Cxn connected with the connecting terminals of an aging jig 3. The aging processing circuit 1 comprises a series circuit of an electrolytic capacitor C, a switch means comprising a normal close contact crb and a common contact crc, and an exciting coil L (opening means) connected between the electrodes of the aging power supply 5. When a predetermined current flows through the electrolytic capacitor C, the exciting coil L is excited to open the switch means. Consequently, a holding means comprising a normal open contact cra, the common contact crc and a holding power supply 7 functions to sustain the open state of the switch means thus preventing subsequent current supply to the electrolytic capacitor C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aging process circuit for an electrolytic capacitor, and more particularly to an aging process circuit for an electrolytic capacitor which can control an exciting current flowing through the capacitor to an optimum state when the aging process is performed on the electrolytic capacitor.

[0002]

2. Description of the Related Art As is well known, thin electrolytic capacitors are
For example, an aluminum thin film is used as an anode, an electrolytic substance is impregnated between the anode foil and the cathode foil, and a DC voltage is applied to both electrode foils to electrolytically oxidize the electrolytic substance to form an extremely thin oxide film between the electrode foils. It is an element manufactured by producing a dielectric material.

Therefore, in the process of manufacturing the electrolytic capacitor, an aging treatment is required before the inspection of the capacitor to apply a voltage to the capacitor to form the capacitor. Therefore, an aging processing circuit that performs an aging process has been proposed.

Conventional aging processing circuits are roughly classified into those using a constant current circuit and those using only a charging resistor.

In this aging processing circuit using a constant current circuit, the capacitor and the constant current circuit are connected in series so that a constant current flows through the capacitor.
By passing the charging current, the capacitor can be chemically formed.

In the aging processing circuit using only the charging resistor, the capacitor and the charging resistor are connected in series,
A direct current voltage is applied to this series circuit, and the formation of the capacitor can be performed by supplying a charging current.

[0007]

The above constant current, or
The aging method using a charging resistor has a drawback in that, in the aging process among a large number of capacitors, a capacitor which causes thermal breakdown due to a foil defect is destroyed during aging, and a non-defective capacitor nearby is mechanically destroyed.

An object of the present invention is thus to detect this before the destruction of the capacitor leading to thermal destruction and prevent the influence on the surroundings.

[0009]

In order to achieve the above object, an aging processing circuit for an electrolytic capacitor of the present invention comprises:
In an aging processing circuit of an electrolytic capacitor for performing an aging treatment by connecting a plurality of electrolytic capacitors in parallel and applying an aging voltage to each electrolytic capacitor, a switch means connected to one end of each electrolytic capacitor, and the switch. A means for opening the means in a state where a current equal to or higher than a predetermined constant current flows through the electrolytic capacitor, and a holding means for holding the open state once the switch is in the open state. is there.

[0010]

According to the present invention having the above-described structure, a series circuit including an electrolytic capacitor, a switch means, and an opening means is connected to an aging power source, and a current of a predetermined constant current or more flows through the electrolytic capacitor. Then, the opening means operates to open the switch means to cut off the current flowing through the electrolytic capacitor, and when the switch means is opened, the holding means operates to keep the switch means open. As a result, the exciting current no longer flows through the electrolytic capacitor.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram of essential parts showing an embodiment of an aging processing circuit for an electrolytic capacitor according to the present invention.

In FIG. 1, the aging processing circuit 1 is
Broadly classified, aging jig 3 and aging power supply 5
And a holding power supply 7.

The aging jig 3 can attach and detach a plurality of electrolytic capacitors C _x1 , C _x2 , ..., C _xn (n is an arbitrary integer), and a plurality of electrolytic capacitors C can be attached.
_x1 , C _x2 , ..., C _xn are connected and connected in parallel, and an aging voltage is supplied from the aging power source 5 to each electrolytic capacitor C _x1 ,
Axing processing can be performed by applying to C _x2 , ..., C _xn . In the aging jig 3, one ends of the charging resistors R ₁ , R ₂ , ..., R _n are commonly connected to the anode of the aging power source 5.

The other ends of the charging resistors R ₁ , R ₂ , ..., R _n are connected to one _ends of the electrolytic capacitors C _x1 , C _x2 , ..., C _xn , respectively. Each electrolytic capacitor C _x1 , C _x2 ,
_,, the other end of C _xn has protector relays CR ₁ , CR ₂ ,
,, CR _n normally closed contacts cr _b1 , cr _b2 , ..., cr _bn
It is connected to the. In addition, each protector relay CR ₁ ,
Common contacts of CR ₂ , ..., CR _n cr _c1 , cr _c2 , ..., cr
_cn, each protector relay _{CR 1, CR 2, ...,} CR excitation coil (open to means) _{n L 1, L 2, ...} , are connected to one end of the L _n. The other ends of the exciting coils (opening means) L ₁ , L ₂ , ..., L _n are commonly connected and connected to the cathodes of the aging power source 5 and the holding power source 7, respectively. Further, the anode of the holding power source 7 is a diode D
Connected to the anode of. The cathode of the diode D, the protector relay _{CR 1, CR 2, ...,} CR respective normally open contacts of the _{n cr a1, cr a2, ...} , are connected to the cr _an,. The holding power source 7, diode D, contact point cr
_{a1, cr a2, ..., cr} an, and the holding means by their connection is constructed.

The aging power source 5 is, for example, 100
[V] to 550 [V] can be arbitrarily set by the user. In addition, each protector relay CR ₁ , C
R _2, ..., exciting coil L ₁ of the _{CR n, L 2, ...,} L n , for example 20 current is excited and flows of [mA], the common contact cr _c1, cr _c2, ..., contact the cr _cn cr _a1 , cr _a2 ,
..., connect to the cr _an side.

The characteristic operation of the embodiment thus configured will be described.

First, a plurality of electrolytic capacitors C _x1 , C _x2 , ..., C _xn are mounted and connected to predetermined connection terminals of the aging jig 3. Then, a predetermined aging voltage (the voltage value is selected by the user) is applied from the aging power source 5 to each electrolytic capacitor C _x1 , C _x2 , ..., C _xn to perform the aging process.

When the aging process is normally completed, the electrolytic capacitor which has been subjected to the aging process is removed from the connection terminal, and the electrolytic capacitor which has not been processed is attached to the connection terminal to perform the aging process. I repeat.

When the quality of the electrolytic capacitor is poor, the voltage / current characteristics may be deteriorated. For example, when the quality of the electrolytic capacitor C _x2 is poor and the voltage / current characteristics are poor, the electrolytic capacitor may be deteriorated. A pseudo short circuit occurs at C _x2 . Then, the positive electrode of the aging power source 5 → charging resistance R ₂ → electrolytic capacitor C _x2 → protector relay CR ₂
Through contact point cr _b2 → common contact cr _c2 → excitation coil L ₂ → cathode of aging power source 5 for example, 20 [m
A] or more current flows. This makes that the exciting coil L ₂ of the protector relay CR ₂ is energized, the common contact cr _c2 will be connected to the contact cr _a2 away from the contact cr _b2. As a result, the anode of the power source 7 for holding → diode D → contact cr _a2 → common contact cr _c2
→ Excitation coil L ₂ → A closed circuit called the cathode of the holding power supply 7 is formed, and the holding current flows in the closed circuit, whereby the excitation coil L ₂ is kept in the excited state. Therefore, the contact point cr
_{Once b2} and the common contact cr _c2 (switch means) are opened, the opened state is maintained. As a result, no current flows through the electrolytic capacitor C _x2 .

As described above, according to this embodiment, the electrolytic capacitor C, the switch means including the contact point cr _b and the common contact point cr _c, and the opening means including the exciting coil L are connected in series, and the anode / cathode of the aging power source 5 is connected. When a constant current flows through the electrolytic capacitor C connected in between, the exciting coil L is excited and the switch means (normally closed contact cr _b and common contact c
r _c ) is opened. As a result, the current flowing through the electrolytic capacitor C is cut off. In addition, switch means (contact c
When r _b and the common contact cr _c ) are opened, the contact cr _a (normally open contact), the common contact cr _c, and the holding power supply 7
The holding means consisting of (3) is operated, whereby the open state of the switch means is maintained, and no more current flows through the electrolytic capacitor C.

As a result, according to the present embodiment, since a current does not flow through the electrolytic capacitor after a constant value of current flows, it is possible to prevent thermal damage due to the flow of excessive current, and to suppress the charging current by charging. It is not necessary to select a resistor for each electrolytic capacitor, and a charging resistor having a constant resistance value can be used.

Further, in this embodiment, since a complete short circuit can be prevented in advance, it is possible to prevent the adverse effect on other non-defective capacitors by preventing the spark and the burst due to the short circuit as in the conventional case.

Further, in the present embodiment, if it is possible to indicate that the common contact cr _c is connected to the contact cr _a , it is possible to detect the electrolytic capacitor in the pseudo short-circuited state and to easily detect a defective product or the like. Can be determined.

[0025]

As described above, according to the present invention, when an exciting current of a predetermined constant current or more flows, no current flows in the electrolytic capacitor thereafter.

Therefore, (1) it is possible to prevent thermal damage due to the flow of an excessive current, and (2) it is not necessary to select a charging resistor for each electrolytic capacitor, and a charging resistor having a constant resistance value can be used. 3) It has an excellent effect that it can prevent a complete short circuit.

[Brief description of drawings]

FIG. 1 is a circuit diagram of essential parts showing an embodiment of an aging processing circuit for an electrolytic capacitor according to the present invention.

[Explanation of symbols]

1 Aging processing circuit 3 Aging jig 5 Aging power supply 7 Holding power supply C _x1 , C _x2 , ..., C _xn Electrolytic capacitors R ₁ , R ₂ , ..., R _n Charging resistance CR ₁ , CR ₂ , ..., CR _n Protector relays cr _a1 , cr _a2 , ..., cr _an normally open contacts cr _b1 , cr _b2 , ..., cr _bn normally closed contacts cr _c1 , cr _c2 , ..., cr _cn common contacts L ₁ , L ₂ , ..., L _n Excitation coil (opening means)

Claims (1)

[Claims] 1. An aging processing circuit for an electrolytic capacitor, wherein a plurality of electrolytic capacitors are connected in parallel to apply an aging voltage to each electrolytic capacitor to perform an aging process. A switch connected to one end of each electrolytic capacitor. Means, a means for opening the switch means in a state where an exciting current of a predetermined constant current or more flows in the electrolytic capacitor, and a holding means for holding the open state when the switch is once in the open state. An aging processing circuit for an electrolytic capacitor, comprising: