GB2089569A - Metallized-film Dual Capacitor - Google Patents
Metallized-film Dual Capacitor Download PDFInfo
- Publication number
- GB2089569A GB2089569A GB8137046A GB8137046A GB2089569A GB 2089569 A GB2089569 A GB 2089569A GB 8137046 A GB8137046 A GB 8137046A GB 8137046 A GB8137046 A GB 8137046A GB 2089569 A GB2089569 A GB 2089569A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- metallized
- winding
- margin
- termination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 50
- 239000011104 metalized film Substances 0.000 title claims abstract description 41
- 230000009977 dual effect Effects 0.000 title claims abstract description 23
- 239000010408 film Substances 0.000 claims abstract description 68
- 238000004804 winding Methods 0.000 claims abstract description 60
- 238000001465 metallisation Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims description 17
- -1 polypropylene Polymers 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- HBGGXOJOCNVPFY-UHFFFAOYSA-N diisononyl phthalate Chemical compound CC(C)CCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC(C)C HBGGXOJOCNVPFY-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/255—Means for correcting the capacitance value
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/32—Wound capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
- H01G4/385—Single unit multiple capacitors, e.g. dual capacitor in one coil
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
A metallized-film dual capacitor comprises a convolute winding (10) of a plain dielectric film (20) and a metallized dielectric film (48) which has metallization over both of its surfaces. A first metal-free margin extends the length of one surface of the metallized film, and a second metal-free margin (42) extends the full length of the other surface and at the other edge to the first margin so as to provide a margin at each lateral-end edge of the winding. A metal-free region (46) extends across one surface of the metallized film (34) so as to divide the metallization on that one surface into a first electrode (36) and a second electrode (38). A first termination contacts the first electrode, a second termination contacts the second electrode, and a third termination contacts the metallization on the other surface of the metallized film. The winding further includes at least one full turn of a third dielectric film (18) which extends beyond one edge of the winding so as to ensure separation between the first termination and the second termination. Additional turns of the plain film (20) are utilized as the protective outer wrap, thereby eliminating the need for a separate outer wrap. <IMAGE>
Description
SPECIFICATION
Metallized Film Dual Capacitor
This invention relates to a metallized film dual capacitor, and more particularly to a common electrode dual capacitor in which all electrodes are metallized surfaces of a single film, and to a method of making the same.
Dual capacitors having a common electrode have been known in the prior art, particularly as shunt capacitors in wave filters. One such construction is shown in U.S. 2,918,635 wherein a single common foil electrode is wound with two shorter, serially disposed, foil electrodes.
It is also known in the prior art to substitute metallized films for foil electrodes in a dual capacitor. It is also known in the prior art to achieve separation between portions of a metallized film by burning metallization from the film at intermediate points in the winding.
The present invention provides a metallizedfilm dual capacitor comprising a convolute winding of a plain dielectric film and a metallized dielectric film having metallization over substantially the full extent of both surfaces, a first metal-free margin extending the full length of one surface of said metallized film, a second metal-free margin extending the full length of the other surface of said metallized film diagonally opposite said first margin, a metal-free region extending across said one surface from said one margin to said second margin dividing said metallization on said one surface into a first electrode and a second electrode, a first termination contacting said first electrode, a second termination contacting said second electrode, and a third termination contacting said metallization on said other surface.
An advantage of a preferred embodiment is the reduction of the inventory of costly metallized film that is required for the construction of metallizedfilm dual capacitors. Further, the effective width of a metallized-film dual capacitor is controlled by complete elimination of wavy margins in the winding. Greater construction efficiency, tighter outer winding, and more uniform tension winding than heretofore attained in metallized-film dual capacitors are also achieved.
In order that the present invention be more readily understood, an embodiment thereof will now be described by way of example with reference to the accompanying drawing, in which:
Figure 1 is a perspective of a finished capacitor winding,
Figure 2 is a perspective of the capacitor of
Figure 1 partially unrolled to reveal the interrelationship of the films, and
Figure 3 is a cross-section taken along line 33 of Figure 2.
In general, a metallized-film dual capacitor 10 according to an embodiment of this invention is a convolute winding of a plain dielectric film 20 and a metallized dielectric film 30 which has metallization 32, 34 over substantially the full extent of both of its surfaces. A first metal-free margin 42 extends the length of one surface of the metallized film, and a second metal-free margin 44 extends the full length of the other surface and is disposed diagonally opposite the first margin 42 so as to provide a margin at each lateral-end edge of the winding. A metal-free region 46 (Figure 2) extends across one surface of the metallized film 30 from one margin to the second margin so as to divide the metallization 34 on that one surface into a first electrode 36 and a second electrode 38.A first termination 14 contacts the first electrode, a second termination 1 6 contacts the second electrode, and a third termination (not shown) contacts the metallization on the other surface of the metallized film. The winding further includes at least one full turn of a third dielectric film 18 which extends from one edge of the winding so as to ensure separation between the first termination 14 and the second termination 16.
The construction utilizes additional turns of the plain film 20 as the protective outer wrap, thereby eliminating the need for the separate outer wrap of prior art metallized dual capacitors. By maintaining the continuous plain film under tension during the rolling and the outer wrap, a tighter finished winding is obtained than is attainable in the prior art where an additional wrapper film has to be introduced into the winding.
In the drawing, Figure 1 shows the capacitor 10 of this invention in perspective, with the third dielectric separator 1 8 extending from the winding between the terminations 14 and 1 6.
Figure 2 shows the capacitor 10 of Figure 1 in a partially unrolled condition so as to reveal the interrelationship of the films 20, 30 and their terminations. Figure 3 further shows the spacial relationship of the three dielectric films that are employed in the capacitor 10 of this invention.
Figure 1 shows terminals 1 5 and 17 attached to the terminations 14 and 16, respectively, extending from one lateral end of the convolute winding. Terminal 13 extends from the opposite end of the convolute winding in contact with a similar termination that is not shown in the drawing. The third dielectric separator 1 8 extends outwardly from the one lateral end of the capacitor 10 so as to separate the terminations 14 and 16 on that end.
Figure 3 shows the relative lateral placement of the films 20 and 30 for the preferred embodiment of this invention. Film 20 is preferably wide enough to extend about half-way into unmetallized margins 42 and 44 on the opposite surfaces of film 30. Film 20 could be of substantially the same width as film 30, although such a width would make more difficult the application of the termination material to the ends of capacitor winding 10 in good electrical contact with the metallization 32 or 34 extending from that end of the winding.
Figure 3 also shows the lateral extent of spacer 1 8 in the winding 10. It is important that separator 18 extends beyond one end of winding 10 to an extent greater than the thickness of the termination material to be applied to that end.
Separator 1 8 is preferably made of a material to which the termination material does not stick, and which is preferably a material that is stiff enough to rebound from any crushing in the operation of applying the termination material. Suitable materials for separator 1 8 are polymers such as polycarbonate or polysulfone. About the only restriction on the material for separator 18 apart from it being dielectric is that the material should not melt at the temperature of application of end spray metallizations 14 and 1 6.
Figure 2 shows a partially unrolled layout of capacitor 10 so as to expose metallization 34 on the top side of film 30, as also shown in crosssection in Figure 3. Film 20 is shown as extending beyond the tail end of film 30, and film 30 is shown having an end margin 48; both practices serving to insure against shorting the metallizations on the opposite surfaces of film 30 when the film 30 is cut between successive windings 10 from the same roll of material.
Although metal-free end 48 ensures non-shorting between metallized surfaces, it should be understood that the normal clearing action in a metallized winding serves to vaporize any bridges between metal surfaces that might be present without margin 48.
Film 30 is provided with a metal-free region 46 which extends completely across film 30 from margin 42 to margin 44, thereby dividing the metallization 34 on that surface of film 30 into separate electrodes 36 and 38. The width of metal-free region 46 is shown as being slightly greater than the width of margins 42 and 44 and also end region 48. However, all of the metal-free regions may be of the same width, so long as each metal-free region is of a greater width than the arc-over distance of the rated voltage of the capacitor winding.
In the processing of the capacitors of this invention, the applied overload is twice the rated voltage hence, the metal-free regions in the commercial embodiments are at least twice the arc over distance of the rated voltage.
Metallization 32 is continuous on the surface of film 30 from one end of the winding 10 to the other. Metallization 32 provides the common electrode in capacitive relation to metallizations 34 and 38, so as to provide a serially-wound dual capacitor 10.
Film 30 is preferably provided with the diagonally opposite margins 42 and 44 prior to winding of capacitor section 10. Margins 42 and 44 may be provided during the metallization of film 30, as by suitable masks within the metallization chamber.
However, in order to be able to wind successive capacitors from a continuous roll of the metallized-film material, it is preferred that regions 46 and 48 on film 30 be cleared of metal during the operation of winding each capacitor. It is preferred that the demetallizing operation be accomplished on the capacitor winding machine by means of a brush which scrubs or erases the metal coating from only one surface of the film. A suction applied around the scrubber serves to capture the particles of metallization, and thereby prevent their incorporation into the winding.
Metal-free region 46 is provided in the winding after a sufficient number of turns have been rolled to provide the desired capacitance of the inner of the two capacitors. In a like manner, whenever metal-free region 48 is to be provided, metal removal is done after a sufficient number of additional turns have been rolled to attain the desired capacitance of the outer capacitor. In practice, it has been found that it is effective to make the width of metal-free region 48 at least twice the width needed to ensure separation of the metal coatings on the opposite surfaces of the film. The winding machine is then programmed to cut the film 30 in the middle of region 48, thereby also providing a metal-free start for the next capacitor winding,
Films 20 and 30 may be selected from among polypropylene, polyethylene terephthalate, polycarbonate, and polyethylene.It is preferred that films 20 and 30 be of the same material, with polypropylene being employed in the preferred embodiment.
Metallization on the surface of film 30 may be selected from any of the known vapour deposited materials used in the capacitor art, such as aluminium or zinc. Aluminium has been selected as the preferred embodiment for its ease of handling and its highly reproducible electrical properties.
Terminations 14 and 16 may be of any solderlike material known to provide good electrical contact to aluminium and which can be applied by metal spray techniques. Sprayed zinc is the preferred material, with sprayed aluminium also being satisfactory. The zinc termination permits terminals to be attached by welding or by soldering to an overcoat of a tin/lead solder of 60/40 composition.
Terminals 13, 1 5 and 17 are preferably tinned copper tab stock. The terminals may be applied to the terminations of capacitor 10 by conventional techniques known to the metallized capacitor art, with reflowing of the solder overcoat on the termination materials being satisfactory.
However, direct welding to the zinc termination is the preferred method.
The capacitors may be housed in any conventional capacitor encasement, such as preformed metal or plastic cases, or by moulding or coating techniques. It is preferred that aluminium cans be employed with terminals 13, 1 5 and 1 7 being secured to separate terminals in the cover of such a capacitor can. Suitable pressure interrupters known to the capacitor art are preferably utilized across the terminals so as to avoid rupture of the housing in the event of over pressure.
The preferred method of this invention is described in terms of a dual capacitor having a 5 mfd. inner section and a 35 mfd. outer section.
Polypropylene film of 8 microns thickness was used for both the plain and the metallized films.
The metallized film 30 was metallized on both surfaces with aluminium to provide a surface resistivity of 1 to 4 ohms/square. Margins 42 and 44 were each 2.5 mm along the full length of film 30.
Capacitor winding 10 was started by spinning 200 turns of plain film 20 and then inserting double metallized film 30. A smaller number of starting turns of plain film 20 would be satisfactory, provided that a rigid core was employed.
The metallized film 30 was 100 mm wide and the plain film 20 was 98 mm wide. The films were centered so that film 30 extended 1 mm beyond each edge of film 30. In other words, 1 mm of metal was left available for termination spray at each edge of the winding 1 0.
The 5 mfd. inner section was completed by winding 270 turns of combined films 20 and 30.
Barrier 1 8 was inserted into the winding and margin 46 was produced by brushing away 1 Omm of metallization from one side of film 30.
After 2 turns of combined films 20, 30 and 18 were wound, barrier film 1 8 was cut and released from the winding. The 35 mfd. outer section was completed by winding 820 turns of combined films 20 and 30, at which time metallized film 30 was cut and released from the winding. Capacitor winding 10 was completed by winding 50 additional turns of plain film 20, and then heat sealing film 20 to itself by raising the film temperature to 1 800C by contact with a heating element.
Terminations were provided by spraying zinc onto both ends of winding 10 so as to contact the metallizations extending to each of the edges of the winding. Tinned copper terminals 13, 15 and 1 7 were thereafter welded to the respective zinc terminations.
Winding 10 was housed within a cylindrical metal can having three through terminals in its cover, with each of winding terminals 13, 1 5 and 1 7 joined to a respective cover terminal. The housing was sealed in the conventional manner except for a fill hole in the cover.
A vacuum was pulled on the housing, and then a suitable dielectric oil, e.g. diisononylphthalate, was introduced through the fill hole at 15 psi gauge pressure. Three vacuum and pressure cycles of impregnation were completed so as to ensure the elimination of voids in the winding.
The fill hole in the housing was closed by solder.
Claims (8)
1. A metallized-film dual capacitor comprising convolute winding of a plain dielectric film and a metallized dielectric film having metallization over substantially the full extent of both surfaces, a first metal-free margin extending the full length of one surface of said metallized film, a second metal-free margin extending the full length of the other surface of said metallized film diagonally opposite said first margin, a metal-free region extending across said one surface from said one margin to said second margin dividing said metallization on said one surface into a first electrode and a second electrode, a first termination contacting said first electrode, a second termination contacting said second electrode, and a third termination contacting said metallization on said other surface.
2. A metallized-film dual capacitor according to claim 1 wherein said plain film is continued in said winding beyond the outer end of said metallized film a plurality of turns so as to provide the outer wrap of said winding.
3. A metallized film dual capacitor according to claim 1 wherein said winding includes at least one full turn of a third dielectric film extending from said winding between said first termination and said second termination.
4. A metallized-film dual capacitor according to claim 3 wherein said third dielectric film is arranged not to stick to said first termination or said second termination.
5. A metallized-film dual capacitor according to claim 1 wherein the width of each of said first margin and said second margin and said region is greater than the arc-over distance of twice the rated voltage of said winding.
6. A metallized-film dual capacitor according to claim 1, wherein the beginning and the end of at least one surface of said metallized film are metalfree from said one margin to said second margin.
7. A metallized-film dual capacitor according to claim 1 wherein said plain film and said metallized film are selected from among polypropylene, polyethylene terephthalate, polycarbonate, and polyethylene.
8. A method of making a metallized-film dual capacitor comprising winding a plain film together with a film which has metallization over substantially the full extent of both surfaces and a metal-free margin on each of said surfaces, inserting into said winding a short length of a third dielectric film so as to extend beyond one lateral edge of said winding, removing metallization from across one surface of said metallized film within the extent of said short length to as to divide the metallization on said one surface into two electrodes, continuing the winding of said plain film beyond the end of said metallized film so as to provide an outer wrap for said winding, and applying termination material to the lateral end edge of said winding from which said third film extends so as to contact said two electrodes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21559480A | 1980-12-12 | 1980-12-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2089569A true GB2089569A (en) | 1982-06-23 |
| GB2089569B GB2089569B (en) | 1985-06-05 |
Family
ID=22803598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8137046A Expired GB2089569B (en) | 1980-12-12 | 1981-12-09 | Metallized film dual capacitor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS57124414A (en) |
| CA (1) | CA1158730A (en) |
| GB (1) | GB2089569B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447854A (en) * | 1982-11-22 | 1984-05-08 | Sprague Electric Company | Oval dual-AC-capacitor package |
| EP0127117A2 (en) * | 1983-05-27 | 1984-12-05 | Siemens Aktiengesellschaft | Wound capacitor having edge contacts comprising at least two individual capacities, and method of making it |
| GB2159329A (en) * | 1984-03-05 | 1985-11-27 | Stc Plc | Multi-terminal interference suppression capacitor |
| DE102011118577A1 (en) * | 2011-11-15 | 2013-05-16 | Epcos Ag | Capacitor component e.g. film capacitor, has electrical functional component that is formed by winding the metallized film support strand on base portion |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59213122A (en) * | 1983-05-18 | 1984-12-03 | ニチコン株式会社 | Method of producing capacitor |
| JPS60150617A (en) * | 1984-01-18 | 1985-08-08 | 松下電器産業株式会社 | Composite capacitor |
| JPS6230325U (en) * | 1985-08-07 | 1987-02-24 |
-
1981
- 1981-11-18 CA CA000390320A patent/CA1158730A/en not_active Expired
- 1981-12-09 GB GB8137046A patent/GB2089569B/en not_active Expired
- 1981-12-11 JP JP56198712A patent/JPS57124414A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447854A (en) * | 1982-11-22 | 1984-05-08 | Sprague Electric Company | Oval dual-AC-capacitor package |
| EP0110526A2 (en) * | 1982-11-22 | 1984-06-13 | Sprague Electric Company | Oval dual-AC-capacitor package |
| EP0110526A3 (en) * | 1982-11-22 | 1984-09-12 | Sprague Electric Company | Oval dual-ac-capacitor package |
| EP0127117A2 (en) * | 1983-05-27 | 1984-12-05 | Siemens Aktiengesellschaft | Wound capacitor having edge contacts comprising at least two individual capacities, and method of making it |
| EP0127117A3 (en) * | 1983-05-27 | 1985-04-03 | Siemens Aktiengesellschaft | Wound capacitor having edge contacts comprising at least two individual capacities, and method of making it |
| GB2159329A (en) * | 1984-03-05 | 1985-11-27 | Stc Plc | Multi-terminal interference suppression capacitor |
| DE102011118577A1 (en) * | 2011-11-15 | 2013-05-16 | Epcos Ag | Capacitor component e.g. film capacitor, has electrical functional component that is formed by winding the metallized film support strand on base portion |
| DE102011118577B4 (en) * | 2011-11-15 | 2016-08-04 | Epcos Ag | Capacitor component and method for producing a capacitor component |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57124414A (en) | 1982-08-03 |
| CA1158730A (en) | 1983-12-13 |
| GB2089569B (en) | 1985-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |