JPH09232182A - Metallized film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a capacitor small in size and at low price and readily clear overseas safety standards by a method wherein a capacitor element is covered with a shrinkable tube or an adhesive tape is wound on the capacitor element, and the capacitor element is inserted into a case to be sealed with resin in this structure. SOLUTION: A capacitor element 14 is structured by forming a metallicon electrode 12 at both ends of a metallized film winder body 11 and melting a lead wire 13 in the metallicon electrode 12. An outer periphery of the capacitor element 14 is covered with a shrinkable tube 15 to contact so that melting parts of the metallicon electrode 12 and the lead wire 13 at the both ends are covered, or an adhesive tape is wound about twice or thrice. The capacitor element 14 which is covered with the shrinkable tube 15, and on which the adhesive tape is wound is housed in a resinous case 16, and sealing resin 17 is filled in between the case 16 and the capacitor element 14. Thereby, it is possible to obtain a capacitor capable of bearing a shock voltage of a discharge test in UL or CSA of an overseas safety standards authorization test.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to AC of various electronic devices.
Regarding the metallized film capacitor for noise prevention used in the power supply section, especially the overseas safety standards (UL, CSA, V
The present invention relates to a metallized film capacitor capable of clearing DE and the like.

[0002]

2. Description of the Related Art Conventionally, there are noise-preventing metallized film capacitors used in AC power supply units of various electronic devices. The metallized film capacitor comprises a capacitor element formed by winding a metallized film obtained by vapor-depositing a metal on a dielectric film such as a resin film. As shown in FIG. The metallikon electrodes 2 are formed on both ends, the lead wire 3 is welded to the metallikon electrodes 2 to form a capacitor element 4, the capacitor element 4 is housed in a case 5, and a sealing resin is provided between the case 5 and the capacitor element 4. There is one configured by filling 8.

[0003]

In order to obtain the overseas safety standard certification in the cased metallized film capacitor shown in FIG. 4, the potential gradient of the film is made smaller than that of the general-purpose product, and the margin is sufficient. By impregnating the capacitor element 4 with silicon oil,
Sealing resin 8 for improving withstand voltage or filling the case 5
The hardness is significantly reduced, and the amount of the sealing resin 8 is made sufficient to absorb the breaking energy in the overseas safety standard test. However, this increases the shape and size, and requires a large amount of material cost accordingly, which causes a problem of high cost.

The present invention has been made in view of the above points, and an object of the present invention is to provide a metallized film capacitor which is small in size, inexpensive, and capable of easily meeting overseas safety standards.

[0005]

In order to solve the above problems, the invention according to claim 1 of the present application provides a capacitor element constituted by winding or laminating a metallized film obtained by vapor-depositing a metal on the surface of a dielectric film. The metallized film capacitor provided is characterized in that the capacitor element is covered with a shrinkage tube or wrapped around an adhesive tape, the capacitor element is inserted into a case, and a resin sealing is performed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are views showing the structure of a metallized film capacitor of the present invention. FIG. 1A is an external view of a capacitor element, FIG. 1B is an external view of a case, and FIG. 1C is a sectional view of a metallized film capacitor. Is. As shown in FIG. 1A, the capacitor element 14 is formed by forming metallikon electrodes 12 on both ends of the metallized film winding body 11 and welding lead wires 13 to the metallikon electrodes 12. A contraction tube 15 is covered on the outer periphery of the capacitor element 14 so as to cover the welded portions of the metallikon electrodes 12 and the lead wires 13 at both ends to contract. In addition, it replaces with the said contraction tube 15 and the adhesive tape is 2-3.
It may be wrapped about once.

The shrinkable tube 15 is covered or an adhesive tape is wrapped around to house the capacitor element 14 in a resin case 16 shown in FIG. 1B, and a sealing resin 17 is filled between the case 16 and the capacitor element 14. By doing so, the metallized film capacitor having the sectional structure shown in FIG. 1C is completed. In the above example, the metallized film is wound to form the metallized film roll 11, but the present invention is not limited to this, and a metallized film may be laminated and metallikon electrodes may be provided on both end faces thereof.

UL and CSA, which are overseas safety standard certification tests
Then, there is a test called a discharge test in which a shock voltage is applied to a sample capacitor. When this test is performed on the capacitor having the configuration shown in FIG. 4, there is a problem that the side surface of the case 5 is broken and scattered as shown in FIG.
In order to prevent this, the thickness of the dielectric film is increased, or the gap between the case 5 and the capacitor element 4 is increased, and the sealing resin 8 having a low hardness is filled. However, this method has a large geometrical dimension as described above, and the material cost is also high.

Therefore, in the present embodiment, a contraction tube 15 is covered on the outer circumference of the capacitor element 14 so as to cover the welded portions of the metallikon electrode 12 and the lead wire 13 or contracted, or an adhesive tape is wound around the capacitor element 14 and housed in the case 16. Then
Since the sealing resin 17 is filled and sealed, there is no problem that the side surface of the case 16 is broken and scattered in the UL or CSA discharge test.

FIG. 2 is a diagram showing a circuit configuration of the UL or CSA discharge test. In the figure, Cx is a sample capacitor, Cd is a dump capacitor, 21 is a DC power supply, and 22
Is an AC power supply and 23 is a transformer. The voltage Vac of the AC power supply 22 is Vac = 250V or 120V, and the voltage Vdc of the DC power supply 21 is Vdc = 5000 (Cd + Cx).
/ Cd, and the sample capacitor Cx via the transformer 23
An AC voltage is applied to the switch 24 and the switch 24 is switched in the direction of arrow A to discharge the electric charge stored in the dump capacitor Cd to the sample capacitor Cx. This is repeated 4 times, and the presence or absence of ignition and the presence or absence of scattered conductive parts are checked.

FIG. 3 is a diagram showing an example of the result of the above discharge test, and shows the number of 10 sample capacitors Cx whose case end faces are destroyed and scattered. Cx1 is a sample capacitor using a capacitor element formed by winding a metallized film obtained by vapor-depositing aluminum on a polyester film having a thickness of 9 μm, and Cx2 is a metallized film obtained by vapor-depositing aluminum on a polyester film having a thickness of 10.5 μm. A sample capacitor is one that uses a rotated capacitor element.

As shown in FIG. 3, the sample capacitor Cx1
In the case where the shrinkable tube or the adhesive tape is reinforced, the number of cases where the case end surface is broken and scattered (failed product) is 0, whereas when there is no reinforcement, the number is 4, and the shrinkable tube 15 or the adhesive tape is used. It is clear that the rejected product will be eliminated by reinforcing with. In the case of the sample capacitor Cx2 having a large film thickness, the number of rejected products is 0 even without reinforcement.
However, the shape and size increase as described above.

[0013]

As described above, according to the present invention, the following excellent effects can be obtained. The capacitor element is covered with a shrinkage tube or wrapped around the capacitor element with an adhesive tape, and the capacitor element is inserted into the case and sealed with a resin. Therefore, the UL or CSA discharge test, which is an overseas safety standard certification test, is performed. It is possible to provide a metallized film capacitor that can withstand a shock voltage.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a metallized film capacitor of the present invention.

FIG. 2 is a diagram showing a circuit configuration of a UL or CSA discharge test.

FIG. 3 is a diagram showing an example of a discharge test result of a metallized film capacitor.

FIG. 4 is a diagram showing a configuration of a conventional metallized film capacitor with a case.

FIG. 5 is a diagram showing a broken state of a metallized film capacitor.

[Explanation of symbols]

 11 Metallized film winding body 12 Metallicon electrode 13 Lead wire 14 Capacitor element 15 Shrinkable tube 16 Case 17 Sealing resin

Claims (1)

[Claims] 1. A metallized film capacitor comprising a capacitor element formed by winding or laminating a metallized film obtained by vapor-depositing a metal on a surface of a dielectric film, wherein the capacitor element is covered with a shrinkage tube or the capacitor element is formed. A metallized film capacitor characterized in that an adhesive tape is wrapped around, the capacitor element is inserted into a case, and a resin sealing is performed.