JPH0817672A - Wound type metallized film capacitor - Google Patents

Abstract

PURPOSE:To improve the performance fit for a power circuit by providing the title winding type metallized film capacitor with high safety function, durability and current resistance. CONSTITUTION:Within the title winding type metallized film capacitor, sectional electrodes 13 sectioned by insulating parts 12 on a dielectric film 10, a band type connecting part 14 continuous along one side edge of the film 10 in contact with a metallicon electrode 2 and the fuse parts existing in every space between respective sectional electrodes 13 and the band type connecting part 14 are formed of a zinc vaporized film while the fuse current level fusing off said fuse part is to be selected within the range of 40mA-130mA.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding type metallized film capacitor having a security function (hereinafter referred to as a winding type MF capacitor), which has an improved security function and other electrical characteristics.

[0002]

2. Description of the Related Art A vapor deposition electrode of a metallized film is subdivided into a plurality of parts, and a fuse function is given by narrowing a part of a current path leading from the terminal to the electrode to cause a partial dielectric breakdown in a capacitor. In the event of an accident, the technology relating to the safety function of the capacitor, in which the divided electrode having the accident is cut off by fusing the fuse part and the remaining electrode continues to maintain the function of the capacitor, starts from Japanese Patent No. 132759, There are a large number such as Japanese Patent Laid-Open No. 52-4049, and European Patent Office published patent application 0 017 556 A1 (France).

The above capacitor has been put to practical use today after many improvements. For example, Japanese Patent Publication 1-21
In the capacitor disclosed in Japanese Patent No. 613, the magnitude of the fuse current is 1
0 mA-1 A, the capacitor disclosed in Japanese Unexamined Patent Publication No. 5-251266 specifies the shape of the fuse portion, and
In the capacitor disclosed in Japanese Patent No. 4450, the safety function of the capacitor is improved by specifying the size of the fuse portion.

In each of the above techniques, the electrode of the metallized film is divided (divided) into a plurality of portions by the insulating groove as shown in FIG. 1 or 6, and a part of the current path of each divided electrode is narrowed. Then, the fuse function is obtained, and the fault current (overcurrent) generated inside the dielectric under a certain segment electrode is quickly interrupted, and the segment electrode at the fault location is disconnected from the power supply, resulting in a short circuit, smoking, or ignition due to a fault. The purpose is to improve the safety function of the wound type MF capacitor by preventing the damage such as explosion from spreading to the entire capacitor.

[0005]

As described above, the conventional wound-type MF capacitor having a security function is mainly focused on improving the security function among the basic performances required as a capacitor. , There was a problem with other basic performance.

That is, the conventional wound-type MF capacitor with a safety function has the following characteristics in terms of withstanding current against inrush current at power-on and large current during charging / discharging and durability for long-term operation. Compared with the winding type MF capacitor which does not have the security function, it was comparable.

Among the above-mentioned several prior arts, the invention closest to the present invention is the invention described in Japanese Examined Patent Publication No. 1-21613 which specifies the magnitude of the fuse current. This includes, in addition to the embodiment in which a narrow fuse portion is provided in the vapor deposition film as described above, an embodiment in which the vapor deposition film itself is thinned to increase the film resistance value, and innumerable flaws are formed in the vapor deposition film instead of the narrow portion. Examples are shown in which a crack zone provided with the above is provided and an example in which the contact between the vapor-deposited film and the metallikon electrode is incomplete by coating with silicone oil.

Among these, in the embodiment of the wound type MF capacitor in which the narrowed fuse portion is provided in the vapor deposition film as in the other prior art described above, the fuse current is as large as 140 to 300 mA, so that a certain segment electrode Even if a through discharge accident occurs, it will not be melted immediately, but heat generation at the accident location will cause dielectric breakdown over several layers.

In addition, in the embodiment in which the vapor deposition film is thinned to increase the resistance value, the electrode area is greatly reduced due to the electrolytic corrosion of the divided electrodes, and there is a problem in terms of durability. In addition, in the example in which the crack band is provided in the vapor deposition film, the fuse current is similarly larger, and the fuse current values of the respective segment electrodes are uneven, so that the reliability of the operation is deteriorated. Further, in the example in which the contact with the metallikon electrode was made incomplete by the silicone oil, the fuse current values of the electrodes of each section were not the same as in the case of the crack zone, and the section which was not in contact with the metallikon electrode from the beginning was used. The electrodes appear, the capacitance of the capacitor is not constant, and the current resistance is significantly reduced.

Aluminum has been widely used as a vapor deposition metal in the past.
In JP-A-21613 and JP-A-5-251266, only aluminum is shown as an example, and the vapor deposition metal is unknown in the remaining prior art. However, the aluminum vapor deposition film has a larger reduction in the film area due to the electrolytic corrosion action than the zinc vapor deposition film, and the contact with the metallikon electrode is worse than that of the zinc vapor deposition film. As in the invention described in Japanese Patent Publication No. 1-21613, when each of the divided electrodes is separated up to the contact portion with the metallikon electrode, the contact between some of the divided electrodes and the metallikon electrode is often cut off. As a result, the capacitance of the capacitor is reduced, which causes the deterioration of current resistance and durability. Therefore, the current resistance of the conventional wound-type MF capacitor having this type of aluminum vapor deposition film with a fuse portion was as low as 20 A / m or less according to the tests by the inventors.

The present invention is a wound type MF in which a metal evaporated film electrode is divided into a plurality of electrodes, and a narrow fuse portion is provided on each divided electrode.
In a capacitor, the fuse portion is surely blown at a lower fuse current value to further enhance the security function thereof and to enhance the current resistance and durability of the capacitor.

[0012]

Also in the present invention, at least one of a pair of capacitor electrodes facing each other with a dielectric film sandwiched therebetween is metal-deposited, as in the conventional wound type MF capacitor with a security function. This metal vapor deposition electrode is divided into a plurality of sections along the longitudinal direction of the film to form section electrodes, and each section electrode is bonded to a metallikon electrode at one side edge of the film, A narrow fuse portion is provided at a position of the division electrode close to the metallikon electrode.

As a feature of the present invention, the vapor-deposited metal is zinc, the fuse portion is provided for each of the divided electrodes, and the portion between the fuse portion and the metallikon electrode of each of the divided electrodes is the above. A band-shaped continuous current path is formed in the longitudinal direction of the film, and the fusing current of the fuse portion is 4
It is selected within the range of 0 mA to 130 mA.

The width of the metal vapor deposition film in the fuse portion is 0.3 mm to 1.7 mm, particularly 0.4 to 1.2 mm.
Is appropriate. The length of the fuse portion is 1.0 to 2.0 times the width of the fuse portion, particularly 1.1 to 1.8.
It is desirable to be double. Further, the thickness of the vapor deposition film is 2 to 6 Ω / □ in the strip-shaped conducting path coupled to the metallikon electrode, 4 to 8 Ω / □ in the fuse part, and 6 to 1 in the section electrode part.
It is desirable to select 6Ω / □.

[0015]

[Function] When aluminum is used as the vapor deposition metal,
The electrode causes an electrolytic corrosion effect from the surroundings during use to reduce the effective area, resulting in a decrease in capacity. Furthermore, if the electrodes are divided to provide a security function, the electrolytic corrosion of the electrodes becomes larger. According to the present invention, since zinc, which is less likely to be corroded during use than aluminum, is used as a vapor deposition metal, it is possible to reduce the capacity decrease due to the reduction of the electrode area and improve the durability of the capacitor.

Further, since the aluminum vapor deposition electrode has a poor compatibility with a metallikon metal such as zinc due to the formation of an oxide film on the surface, the contact between the two is likely to be incomplete. In particular, when the vapor deposition electrode is divided up to the contact portion with the metallikon electrode, as shown in Japanese Patent Publication No. 1-216613 and Japanese Patent Laid-Open No. 5-4450, a certain division is often used. In some cases, the electrode is initially shielded from the metallikon electrode.

In the case of such a divisional electrode formed by aluminum vapor deposition, the connection with the metallikon electrode is broken due to a large current when the power switch is turned on or during charging / discharging, or the connection is broken due to an electrolytic corrosion effect due to long-term use. It is often dripped, which greatly affects the withstand current and the durability.

Further, in the present invention, since the metal evaporated is zinc, the contact between the evaporated film and the metallikon electrode is good, and the electrolytic corrosion phenomenon of the evaporated film at the contact portion is extremely small. In addition to this, since each segmented electrode is connected to the metallikon electrode by a continuous strip-shaped conduction path, even if the vapor deposition film and the metallikon electrode are not in good contact at a certain segment electrode position, It is possible to prevent the partition electrode from losing its capacitor function.

Further, when a large current flows between each sectioned electrode and the metallikon electrode, this current is dispersed by the strip-shaped conducting path and flows through the contact portion with the metallikon electrode. Even if the contact between the vapor-deposited film and the metallikon electrode is not good at the position, it is possible to prevent the contact portion from being cut by a large current.

Further, in the present invention, the vapor deposition film resistance in the fuse portion is 4 to 16 Ω / □, preferably 4 to 8 Ω /
By selecting □, one fuse for each sectioned electrode, and selecting the width and length of the fuse and the fuse current appropriately according to the rating of the capacitor, it is possible to prevent the fuse from fusing openly. The current resistance and durability of the capacitor can be improved.

That is, in a capacitor having a rated voltage of 200 V-AC, the fuse width is 0.3 mm or more, the ratio of the length to the fuse width is 2.0 or less, and the fuse current is 4
By selecting 0mA or more, the rated voltage is 400V-
For AC capacitors, the fuse width is 0.6 mm
Above, by selecting the fuse current over 70mA,
The current resistance and durability of the capacitor can be further improved.

Furthermore, in the present invention, by properly selecting the width and length of the fuse and the fuse current, the fuse can be surely blown in the event of an accident, and the safety of the capacitor can be improved. That is, the fuse width is 1.5m
m or less, the ratio of the length to the fuse width is 1.0 or more,
By selecting the fuse current to 130 mA or less, the safety function of the capacitor can be ensured.

Further, when a plurality of fuse portions are provided on each divided electrode, a narrow fuse width of 1.7 mm at maximum is divided as described above, and as a result, the fuse current between the divided fuse portions is divided. However, in the present invention, since only one fuse portion is provided for each divided electrode, the accuracy of the fuse operation can be improved.

Further, in the present invention, the resistance value of the vapor-deposited film is 2 to 6 Ω / in the strip-shaped conducting path in contact with the metallikon electrode.
□, 4 to 8Ω / □ in the fuse part, 6 to 16 in the divided electrode part
By setting Ω / □, it is possible to further ensure the connection with the metallikon electrode, enhance the current resistance and durability, and further enhance the self-recovery function when an accident occurs in a certain segment electrode.

The value of the fuse current that melts the fuse portion is such that when the metal vapor deposition film is unfolded, when the capacitor is made by winding, and when the capacitor is in use, heat is generated and electrical stress is applied. It is expected that they will differ from time to time, but since there is no official standard for measuring this, the method for measuring "fuse current of divided electrodes" described in Japanese Patent Publication No. 1-216613 was adopted.

In this fuse current measuring method, as shown in FIG. 3, a current is passed from the variable DC power supply 31 through the ammeter 32 between the metallikon electrode 2 and the segment electrode 13, and this current is 1 mA / sec. The current when the fuse part 15 is blown is measured in the unfolded state of the film.

Next, since there is no suitable official evaluation method for evaluating the withstand current of the capacitor, a method using the circuit shown in FIG. 4A has been newly devised. FIG.
In (a), the capacitor 41 is charged by the variable DC power supply 45 via the a side of the changeover switch 42, the charging resistor 43 and the power switch 44, and the changeover switch 42 is changed to b.
Turning to the side, the capacitor 41 is discharged via the circuit inductance 46 and the peak ammeter 47. 48
Is a switch controller, which is 1 depending on the capacity of the capacitor 41.
The switch 42 is turned on to the side a for a set time within the range of 10 seconds, and then 0.
The switch 42 is turned to the b side for a set time within the range of 5 to 5 seconds, and this charging / discharging is set as one cycle, and this is continuously repeated 100 cycles.

Before the test, the capacitance (μF) of the capacitor 41 at room temperature and tan δ at 1 kHz were previously set.
Measure the initial value of (%). When the power switch 44 is closed, the changeover switch 42 is put on the a side to charge the capacitor 41, and then the switch 42 is changed to the b side, the capacitor 41 is discharged with a damped oscillation waveform as shown in FIG. 4B. . The voltage of the power supply 45 is adjusted so that the value of the initial peak current Ip at this time is 10 A per 1 m of the length of the capacitor electrode, the switch controller 48 is operated, and the discharge peak current Ip is 10 A / m. 100 cycles of continuous charging and discharging at room temperature.
After standing for a minute, the capacity and the value of tan δ are recorded. This test is referred to as step 1.

Next, the voltage of the power supply 45 is set so that the discharge peak current Ip becomes 20 A / m, and the charging / discharging is performed at 10 times in the same manner.
Perform 0 cycles and record the capacity and tan δ value after 30 minutes, which is referred to as step 2. Similarly, the discharge peak current is increased by 10 A / m, and the capacity and tan δ values are recorded after charging / discharging for 100 cycles each time, and the tests from step 3 are performed.

In the course of this test, the capacitor 41 is damaged by repeated charging and discharging, and the capacitance and the value of tan δ change. Therefore, the capacity or t compared to the initial value
The value of the discharge peak current (A / m) at the step where the value of an δ reached ± 3% or 1.1 times, respectively, is used as the numerical value for the evaluation of the withstand current of the capacitor 41. When a plurality of sample capacitors are used for testing, each sample is tested one by one, and the lowest numerical value among the numerical values obtained for each sample is used for evaluation.

Further, the durability and safety tests of the capacitors were carried out in accordance with the regulations of JIS-C4901. That is,
The durability is measured by measuring the capacity of the sample capacitor after a test time of 1500 hours under a specified test voltage and test temperature, and the rate of change in capacity (ΔC / C%) with respect to the initial value of the capacity.
Evaluate with. In addition, the safety is that the applied voltage of the discharge capacitor among the applied voltage of the sample capacitor is gradually increased to sequentially destroy each part of the electrode, and eventually the capacitor continues to be destroyed until the capacitor capacity becomes 0, The one that does not cause a dangerous state such as ignition, smoke generation, exterior damage, etc. by the safety function is regarded as a pass, and this is performed for a plurality of sample capacitors, and the pass rate (%) is evaluated.

[0032]

Example 1 In FIG. 1A, 10 and 20 are polypropylene films. A blank strip 11 is placed on one side of the film 10, and T-shaped insulating grooves 12 and 1 are formed in the central portion.
The electrodes 13, 13 ... That are divided by 2 ... Are formed with a strip-shaped conduction path 14 continuous to the other side by metal vapor deposition. Each of the electrodes 13, 13, ... Is a T-shaped insulating groove 12,
The heads 12a, 12a of the ... 12 ... Are connected by the narrow fuse portions 15 formed by vapor deposition. A metal vapor deposition electrode 22 is formed on the entire surface of the film 20 except for the blank band 21 located on the side opposite to the blank band 11 of the film 10.

The deposited films 10, 20 are shown in FIG.
The wound product 1 shown in FIG. 2 is produced by overlapping and winding in the mode shown in (a), and the metallikon electrodes 2 and 3 are sprayed on both winding end faces of the wound product 1 to form the capacitor element 4. obtain.
Terminals 5 and 5 are attached to the metallikon electrodes 2 and 3 of the capacitor element 4 by lead wires 6 and 6, respectively, housed in a case 7, dried, filled with a two-component thermosetting resin 8 and cured by heating at room temperature. Then, the wound type MF capacitor was manufactured.

[0034]

[Embodiment 2] The T-shaped insulating grooves 12, 12 ... Are provided between the partition electrodes 13, 13 ... In the capacitor shown in FIG. In the capacitor shown in FIG. 2), the divided L-shaped insulating grooves 12, 12 ...
3 and 13 ... are separated from each other. The rest of the configuration is similar to that of the first embodiment.

[0035]

Example 3 In the capacitor shown in FIG. 1 (a) or FIG. 1 (b), from the viewpoint of the self-recovery function, it is better that the electrode film thickness is thinner, and in terms of durability and current resistance. In view of the above, in order to ensure contact with the metallikon electrode 2, the vapor deposition film thickness of the electrode is preferably large. Therefore, in the embodiment shown in FIG. 5, the film thickness of the electrode deposited on the same film 10 is thin in the divided capacitor electrode 13, thick in the contact portion 14 with the metallikon electrode 2, and the above in the fuse portion 15. The thickness is selected between the two parts. As an example, the membrane resistance of the partition electrode 13 is 6 to 16 Ω / □, the membrane resistance of the fuse portion 15 is 4 to 8 Ω / □, and the metallikon contact portion 14 is
Has a film resistance of 2 to 6 Ω / □.

[0036]

[Test 1] In order to compare the superiority and inferiority of the aluminum vapor deposition electrode and the zinc vapor deposition electrode, a polypropylene film having a thickness of 4.5 μm and a width of 50 mm was used as the films 10 and 20, and aluminum was vapor deposited at different thicknesses from each other. Regarding the manufactured capacitors (Sample Nos. 1, 2, 3) and capacitors manufactured by vapor-depositing zinc on the same polypropylene film with different thicknesses (Sample Nos. 4, 5, 6), the above durability test and current resistance Table 1 shows the results of the tests and safety tests. In addition, 10 sample capacitors were used for each test item for each sample of each number.

[0037]

[Table 1]

From the test results shown in Table 1, in the case of a capacitor having an aluminum vapor-deposited electrode, Sample 1 having a low vapor-deposition film resistance has no problem in terms of durability and current resistance, but its safety is insufficient. However, in Samples 2 and 3 having a relatively large vapor deposition film resistance, the capacity decrease in the durability test was large, and the current resistance was also extremely low. Therefore, it has been found that it is extremely difficult to achieve both durability and current resistance and safety in order to realize a capacitor suitable for a phase advancing capacitor in a power circuit using an aluminum vapor deposition electrode.

On the other hand, in the case of the zinc vapor-deposited electrode capacitor, all of Samples 4, 5, and 6 showed excellent durability and current resistance, but Sample 4 having a low vapor deposition film resistance had a fuse current of 180 mA. Therefore, the problem remains in terms of security, which is the original purpose of this type of divided electrode type MF capacitor.

In the winding type MF capacitor used for advancing the phase of the power circuit by combining these, zinc is suitable as the vapor deposition metal, and the resistance of the vapor deposition film constituting the fuse portion is suitably 4Ω / □ or more. I understood. It should be noted that a capacitor with excellent characteristics can be obtained even when the resistance of the zinc vapor deposition film exceeds 16 Ω / □, but since the vapor deposition film is largely consumed by the influence of moisture in the atmosphere during the manufacturing process, it is practically used. It is a disadvantage.

[0041]

[Test 2] In the vapor deposition pattern shown in FIG.
Comparison between the case where the vapor deposition film thickness of each part is made equal (Sample 7) and the case where the vapor deposition film thicknesses of the strip-shaped current-carrying path 14, the fuse part 15, and the division electrode 13 are made different as shown in FIG. 5 (Sample 8). And for comparison between the case where the metallikon electrode contact portion is continuous in a strip shape as shown in FIG. 1 (a) (Samples 7 and 8) and the case where it is divided as shown in FIG. 6 (Sample 9). In addition, the sample capacitors 7, 8 and 9 shown in Table 2 were used in Example 1
Was manufactured in accordance with the above, and the durability, current resistance, and safety were tested. In addition, each test was implemented about five each sample capacitors.

[0042]

[Table 2]

As is clear from the test results shown in Table 2,
The sample 8 in which the vapor deposition film thickness of the strip-shaped current-carrying path 14 was made thicker as shown in FIG. 5 was superior in current resistance to the sample 7 in which the vapor deposition film thickness was uniform. Further, even when the vapor deposition film thickness of each part was changed as shown in FIG. 5, the sample 8 in which the metallikon electrode contact part was continuous in a strip shape as shown in FIG. 1 was divided as shown in FIG. The sample 9 was significantly superior to Sample 9 in terms of durability and current resistance. The value of -1.84% of the durability test result of Sample 9 is considered to be acceptable, but
This is a value that becomes a problem when used for a long period of time, and the value of 40 A / m of the current resistance test result is considered to be acceptable, but it is a remarkably low value as compared with Samples 7 and 8.

[0044]

[Test 3] In order to find an appropriate value of the ratio of the width dimension a to the length dimension b in the fuse portion 15, five sample capacitors 10 to 27 shown in Table 3 were manufactured for each test item, and the durability, Tests were carried out for current resistance and safety. The test results are shown in Table 3.

[0045]

[Table 3]

The sample capacitor is rated voltage 200V, 6
6.7μF and fuse width a 0.4mm (Sample 1
0 to 15) and 0.8 mm (Samples 16 to 21), rated voltage 400 V, 16.6 μF, and fuse width a 1.
It is divided into 3 groups of 2 mm (Samples 22 to 27). In any group, as the fuse length b increases and the fuse current decreases, the durability and current resistance deteriorate but the safety is improved. Is improving.

Among these, in the group of samples 10 to 15 in which the fuse width was 0.4 mm, samples 11 to 15 in which the length of the fuse portion was 0.4 to 0.8 mm generally showed good results. However, the length of the fuse part is 0.3m
The sample 10 of m had insufficient security. Sample 16
In the group where the fuse width of ~ 21 is 0.8 mm,
Sample 1 with fuse length of 0.6 mm and 0.7 mm
Samples 6 and 17 had insufficient safety, but Samples 18 to 21 having a fuse portion length of 0.8 mm to 1.1 mm were generally good. Further, in the group of Samples 22 to 27 having the fuse width of 1.2 mm, Samples 22 and 23 having the fuse portions of 1.0 mm and 1.1 mm had insufficient safety, but Length 1.2
Samples 24-27 with mm-1.5 mm were generally good.

From the results of the ratio of the length to the width of the fuse portion, it was found that the value within the range of 1.0 to 2.0 was good for each group. Also, in terms of the magnitude of the fuse current, it is 6 in the group of Samples 10-15
8 mA or more, 96 mA or more in the group of Samples 16 to 21 and 135 mA or more in the group of Samples 22 to 27 cause a problem in safety, and the fuse current with extremely small fuse current of 32 mA causes a problem in current resistance. Was there.

Therefore, it was found that the fuse current needs to be at least 40 mA and must not exceed 130 mA. It was also found that the ratio of the length b to the width a of the fuse portion is properly in the range of 1.0 to 2.0.

[0050]

[Test 4] A closer examination of Table 3 shows that the fuse current is related to the fuse width and length and the rated voltage.
Samples 28 to 31 shown in Table 4 and samples 32 to 3 shown in Table 5
Five sample capacitors having different fuse widths of 6 were manufactured for each test item, and the tests of durability, current resistance and safety were performed. Here, in all the samples, the fuse length was set to 1.25 times the fuse width. The sample 7 is a reprint of the sample 7 shown in Table 2.

[0051]

[Table 4]

[0052]

[Table 5]

According to the test result, the rated voltage is 200V.
In samples 28 to 31 and 7 of AC, as shown in Table 4, those having a fuse width in the range of 0.4 to 1.2 mm showed good results, and those having a fuse width of 0.2 mm showed The durability and current resistance were poor, and the fuse with a fuse width of 1.7 mm had poor security. Therefore, the proper range of the width of the fuse portion is considered to be 0.3 to 1.5 mm.

Sample 32 having a rated voltage of 400 V-AC
In Tables 36 to 36, as shown in Table 5, those having a fuse width in the range of 0.8 mm to 1.7 mm are generally good, and those having a fuse width of 0.4 mm or less are poor in durability and have a fuse width. If it exceeds 1.7 mm, the security is expected to deteriorate. Therefore, the proper range of the width of the fuse part is 0.8
It is considered to be 1.7 mm.

In the tests described above, when the samples having particularly poor durability and current resistance were disassembled and inspected, it was found that the cause was all due to the disconnection of the fuse portion. In addition, it was found that the samples with poor security did not blow when the electrodes were short-circuited because the fuse current in the fuse part was too large.

Summarizing the results of the above-mentioned tests, the conditions for the wound type MF capacitor to have both durability and current resistance and safety are as follows. Zinc is suitable as a metal for vapor deposition, and the contact portion of each section electrode to the metallikon electrode needs to be continuous in a strip shape. The number of fuse sections for each section electrode is one, and the vapor deposition film resistance of the fuse section is 4-1
6Ω / □ is suitable. The size of the fuse part and the fuse current differ depending on the rated voltage of the capacitor, but the width a
Is in the range of 0.3 to 1.7 mm, the length b is in the range of 1.0 to 2.0 times the width a, and the fuse current is 40.
Within the range of 130 mA.

Further, by selecting the thickness of the vapor-deposited film to be the thickest in the strip-shaped current-carrying path in contact with the metallikon electrode, the thinnest in the divided electrode portion, and the intermediate thickness between them in the fuse portion, durability and durability can be improved. It is possible to further enhance the current-carrying property and further enhance the security by improving the self-healing function.

[0058]

As described above, according to the present invention,
It is possible to provide a capacitor excellent in a winding type metallized film, which has an improved safety function and an improved durability and current resistance during use, and which is particularly excellent for a power circuit.

[Brief description of drawings]

FIG. 1 is a front view showing a developed state of a metallized film in an example of the present invention.

FIG. 2 is a vertical sectional view of a completed capacitor according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a fuse current measuring circuit used for measurement of an example of the present invention.

FIG. 4 is a circuit diagram of a withstand current measuring circuit used for measurement of an example of the present invention.

FIG. 5 is an explanatory view of a change state of the thickness of a vapor deposition film in another embodiment of the present invention.

FIG. 6 is a front view of a conventional metallized film capacitor in which a metallized film is developed.

[Explanation of symbols]

 1 Metallized Film Rolled Material 2 Metallicon Electrode 3 Metallicon Electrode 4 Capacitor Element 10 Polypropylene Film 11 Blank Band 12 Insulation Groove 13 Sorted Electrode 14 Band-shaped Current Path 15 Fuse Part 20 Polypropylene Film 22 Opposite Electrode

Claims (5)

[Claims] 1. A partition electrode in which at least one of a pair of capacitor electrodes facing each other with a dielectric film sandwiched therebetween is formed by metal vapor deposition, and the metal vapor deposition electrode is partitioned at a plurality of locations along the longitudinal direction of the film. A winding metallized film capacitor in which each sectioned electrode is connected to a metallikon electrode at one side edge of the film, and a narrow fuse portion is provided at a position close to the metallikon electrode of each sectioned electrode. In the above, the vapor-deposited metal is zinc, and one fuse portion exists for each sectioned electrode, and a portion between the fuse section and the metallikon electrode of each sectioned electrode has a strip shape in the longitudinal direction of the film. A winding type metallized flux, characterized in that a fuse current for forming a continuous current path and blowing the fuse portion is in the range of 40 mA to 130 mA. Film capacitors. 2. The wound metallized film capacitor according to claim 1, wherein the fuse portion has a width of 0.3 mm to 1.7 mm. 3. The wound metallized film capacitor according to claim 1, wherein the ratio of the length to the width of the fuse portion is 1.0 to 2.0. 4. The wound metallized film capacitor according to claim 1, wherein the metal vapor deposition film resistance in the fuse portion is 4 to 16 Ω / □. 5. The film resistance value of the current-carrying path that is continuous in a strip shape of the metal deposition electrode is 2 to 6 Ω / □, and the film resistance value of the fuse portion is 4 to 8 Ω / □. The wound-type metallized film capacitor according to claim 1, wherein the film resistance value is 6 to 16 Ω / □.