GB2159329A - Multi-terminal interference suppression capacitor - Google Patents
Multi-terminal interference suppression capacitor Download PDFInfo
- Publication number
- GB2159329A GB2159329A GB08505321A GB8505321A GB2159329A GB 2159329 A GB2159329 A GB 2159329A GB 08505321 A GB08505321 A GB 08505321A GB 8505321 A GB8505321 A GB 8505321A GB 2159329 A GB2159329 A GB 2159329A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- terminals
- foils
- electrode set
- electrode
- 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 31
- 230000001629 suppression Effects 0.000 title description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 239000011888 foil Substances 0.000 claims description 28
- GZCWPZJOEIAXRU-UHFFFAOYSA-N tin zinc Chemical compound [Zn].[Sn] GZCWPZJOEIAXRU-UHFFFAOYSA-N 0.000 claims description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract 1
- 230000011664 signaling Effects 0.000 description 3
- -1 Polypropylene Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 229910000679 solder Inorganic materials 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
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/006—Apparatus or processes for applying terminals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
A capacitor for filtering out interference from the drive circuit of on electric railway vehicle, comprises a series wound capacitor roll with one electrode projecting from one side (X) and the other electrode projecting from the opposite side (Y), and pairs of external connection terminals (A, A', B, B') soldered to metal sprayed portions (16, 17, 16', 17') of the projecting electrode edges, so that the vehicle drive current (1000A) will be carried by one electrode set via terminals (A, A') and either open circuit or short circuit condition in the capacitor will be a fail safe condition for the vehicle. <IMAGE>
Description
SPECIFICATION
Interference suppression capacitor
This invention relates to an interference suppression capacitor.
According to the present invention there is provided a wound foil capacitor having two electrode sets which are exposed on respective opposite sides of the winding, two external connection terminals connected to spaced positions on the exposed adge of one electrode set, and at least one further terminal connected to the exposed edge of the other electrode set, wherein in use of the capacitor the two terminals can be connected in the
D.C. supply path of an electrically driven vehicle such as to filter out interference frequencies in the D.C. supply path and wherein a D.C. supply current will pass through the one electrode set via said two terminals.
Conveniently the capacitor is series wound and has four terminals, two terminals connected to spaced positions on one electrode set, the other two terminals connected to spaced positions on a second electrode set.
Preferably the capacitor comprises a first metal foil on one side of a first dielectric layer, a pair or spaced metal foils on the other side of the dielectric layer, a second dielectric layer on the other side of the pair of metal foils, and a second metal foil on the other side of the second dielectric layer, the foils and layers being wound into a roll, and wherein two terminals are connected to the extended edge of one of the pair of metal foils, the other two terminals being connected to the extended edge of the other foil of the pair of foils.
Preferably the dielectric layers are polyester (polyethelene teraphthalate) the foils are aluminium and the terminals are copper plates.
Preferably too a metallic interface is provided between the electrode edge and the connection terminals. In a preferred embodiment the extended edges are sprayed with zinc with the centre section masked, followed by tin zinc spray, and the terminals are soldered to the tin zinc. In order that the invention can be clearly understood reference will now be made to the accompanying drawings, in which:
Figure 1 shows diagrammatically a capacitor according to an embodiment of the present invention;
Figure 2 shows the winding arrangement of the capacitor of Fig. 1, and
Figure 3 shows the equivalent series resistane of the capacitor of Fig. 2.
The capacitor to be described is for an electric railway vehicle having drive motors with associated field winding and series windings.
D.C. power picked up from adjacent floating live and neutral sources is fed to a motor power circuit having thyristors which are controlled by a control circuit to drive the motors at the required speed. Motor control contactors are closed to drive the vehicle and breaking control contactors are closed in order to brake the vehicle using the motors as generators. In this mode interference from the thyristors in the form of harmonics is worse and lies in the range 1.5 KHz to 5KHz. Within this range can lie the frequency of operation of e.g. a railway signalling system and by inductive coupling between the supply rails or wires and the nearby signalling lines, the interference can upset the signalling. This of course can be dangerous, and is particularly significant at points changeover locations.It is required to filter out the interference in a fail safe manner and the capacitor to be described has been developed for this task.
The capacitor is series wound and has four terminals A, A', B, B'. The electrode set connected to A, A' is designed to carry the full current of the vehicle power circuit in the neutral line and should either electrode set fail e.g. go open circuit, then either the current no longer reaches the vehicle motors (electrode failure of terminals A, A') in which case the vehicle stops or, alternatively, if the other electrode fails, (terminals B,B') which is providing earth continuity for the control circuit, then the earth continuity for the control circuit also fails and this can be sensed to adopt a fail safe mode and stop the vehicle. In the event of a capacitor short circuit then local heating will almost immediately cause an open circuit which is a fail safe mode by the reasons just described.
The capacitor roll is constructed as follows.
Referring to Fig. 2, dielectric layers 11, 11' are sandwiched between vapour deposited aluminium or zinc foil layers 12, 12'. Sandwiched between the dielectric layers is a pair of discrete aluminium foils 1 3 and 1 4 separated by an 8mm gap. Foils 1 3 and 14 could alternatively be of tin. This pair of foils is of sufficient thickness typically 20 microns to pass the required current without overheating.
The aspect ratio of the roll i.e. diameter to width, is such as to ensure satisfactory current capacity through the winding 1 5. This ratio can be between 2:1 and 4:1 and is preferably 3:1. The roll is then metal sprayed onto exposed electrode edges on each of the sides
X, Y (Fig. 1) with zinc and tin zinc, indicated by reference numerals 1 6 and 1 7 (side X on to foil 14) and 16' and 17' onto foil 13 (side
Y). An open current path 18, 18' on each side allows for current to pass through the electrode of the roll.
Terminals A, A' are connected to foil 14 and terminals B, B' are connected to foil 1 3.
These terminals are formed by tinned copper plates having dimensions d = 50mm, b = 6mm, and the thickness of the zinc and tin zinc connection layers is about 5.0mm.
The gap 18, 18' for the current path is about 60mm.
Referring now to Fig. 3, the equivalent series resistance of one side of the capacitor is shown. It comprises resistance R1 representing the copper bar terminal, e.g. A, resistance
R2 representing the disimilar metal interfaces tin/copper (17), solder, tin zinc, zinc, aluminium and resistance R3 represents the resistance of the aluminium foil (14). Similarly resistance is R3', R2' and Ri' represent the corresponding resistance associated with the other terminal A' connected to the same foil (14). In the embodiment described the six series resistances amounts to approximately 0.03 Milliohms. This gives 30W dissipation at a 1000 Amps.
The capacitor roll is housed in an open topped metal case and the internal gaps between the roll and the case filled with a highdielectric resin. The terminal ends A, A', B, B' project from the open end of the case and are insulated with plastic insulating sleeves projecting above the surface of the potting resin to provide an increased leakage path from the terminals to the edge of the metal casing.
The capacitor has a capacitance of 4.7
Microfarad and a working d.c. voltage of 1500 volts.
The preferred dielectric (polyester) is 36 microns thick and 65mm wide metallised with edge margins of 2.5mm. Alternative dielectrics are Polypropylene, Polycarbonate and Paper. Paper needs impregnating leading to possible termination difficulties at the required voltages (5000 volts peak). Polypropylene would require a larger roll owing to its lower permittivity.
Without the requirement for sensing earth continuity through the capacitor terminals B,
B', the capacitor could have a single terminal to replace terminals B, B'.
Claims (7)
1. A wound foil capacitor having two electrode sets which are exposed on respective opposite sides of the winding, two external connection terminals connected to spaced positions on the exposed edge of one electrode set, and at least one further terminal connected to the exposed edge of the other electrode set, wherein in use of the capacitor the two terminals can be connected in the
D.C. supply path of an electrically driven vehicle such as to filter out interference frequencies in the D.C. supply path and wherein a D.C. supply current will pass through the one electrode set via said two terminals.
2. A capacitor as claimed in claim 1 having two said further terminals connected to spaced positions on the second electrode set.
3. A capacitor as claimed in claim 1 or claim 2, wherein the foils are series wound.
4. A capacitor comprising a first metal foil on one side of a first dielectric layer, a pair of spaced metal foils on the other side of the dielectric layer, a second dielectric layer on the other side of the pair of metal foils, and a second metal foil on the other side of the second dielectric layer, the foils and layers being wound into a roll, and wherein two spaced-apart terminals are each connected to the extended edge of one of the pair of spaced metal foils, at least one other terminal being connected to the extended edge of the other foil of the pair of foils.
5. A capacitor as claimed in any preceding claim wherein the dielectric layers are polyester and the foils are aluminium and the terminals are copper plates.
6. A capacitor as claimed in any preceding claim, wherein an electrode set has an exposed edge sprayed with zinc followed by a tin zinc spray, and the terminals are soldered to the tin zinc.
7. A capacitor substantially as herein before described with reference to Fig. 1, Fig. 2 and Fig. 3 of the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08505321A GB2159329B (en) | 1984-03-05 | 1985-03-01 | Multi-terminal interference suppression capacitor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848405719A GB8405719D0 (en) | 1984-03-05 | 1984-03-05 | Interference suppression |
| GB08505321A GB2159329B (en) | 1984-03-05 | 1985-03-01 | Multi-terminal interference suppression capacitor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8505321D0 GB8505321D0 (en) | 1985-04-03 |
| GB2159329A true GB2159329A (en) | 1985-11-27 |
| GB2159329B GB2159329B (en) | 1988-03-09 |
Family
ID=26287415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08505321A Expired GB2159329B (en) | 1984-03-05 | 1985-03-01 | Multi-terminal interference suppression capacitor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2159329B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005061171A1 (en) * | 2003-12-24 | 2005-07-07 | Maxwell Technologies Sa | Brazing method for achieving a mechanical and electrical connection between two pieces |
| US7780066B2 (en) | 2002-12-17 | 2010-08-24 | Abb Technology Ltd | Power capacitor |
| GB2536521A (en) * | 2014-10-31 | 2016-09-21 | Deere & Co | Capacitor with improved heat dissipation |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB560946A (en) * | 1942-10-23 | 1944-04-27 | Hunt A H Ltd | Improvements in or relating to the manufacture of electric condensers |
| GB619364A (en) * | 1946-12-04 | 1949-03-08 | Hunt A H Ltd | Improvements in or relating to the manufacture of metallised paper electrical capacitors |
| GB1159487A (en) * | 1968-04-04 | 1969-07-23 | Standard Telephones Cables Ltd | Capacitors |
| US3792323A (en) * | 1973-05-14 | 1974-02-12 | American Radionic | Wound capacitor |
| GB2052862A (en) * | 1979-06-25 | 1981-01-28 | American Radionic | Dual wound capacitor and method of making the same |
| GB2089569A (en) * | 1980-12-12 | 1982-06-23 | Sprague Electric Co | Metallized-film Dual Capacitor |
| EP0109090A2 (en) * | 1982-11-16 | 1984-05-23 | Zanussi Elettromeccanica S.p.A. | Multiple-capacitor coil of a metallized strip material |
| GB2144915A (en) * | 1983-08-11 | 1985-03-13 | Cambridge Electronic Ind | Multisection wound capacitors and terminations |
-
1985
- 1985-03-01 GB GB08505321A patent/GB2159329B/en not_active Expired
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB560946A (en) * | 1942-10-23 | 1944-04-27 | Hunt A H Ltd | Improvements in or relating to the manufacture of electric condensers |
| GB619364A (en) * | 1946-12-04 | 1949-03-08 | Hunt A H Ltd | Improvements in or relating to the manufacture of metallised paper electrical capacitors |
| GB1159487A (en) * | 1968-04-04 | 1969-07-23 | Standard Telephones Cables Ltd | Capacitors |
| US3792323A (en) * | 1973-05-14 | 1974-02-12 | American Radionic | Wound capacitor |
| GB2052862A (en) * | 1979-06-25 | 1981-01-28 | American Radionic | Dual wound capacitor and method of making the same |
| GB2089569A (en) * | 1980-12-12 | 1982-06-23 | Sprague Electric Co | Metallized-film Dual Capacitor |
| EP0109090A2 (en) * | 1982-11-16 | 1984-05-23 | Zanussi Elettromeccanica S.p.A. | Multiple-capacitor coil of a metallized strip material |
| GB2144915A (en) * | 1983-08-11 | 1985-03-13 | Cambridge Electronic Ind | Multisection wound capacitors and terminations |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7780066B2 (en) | 2002-12-17 | 2010-08-24 | Abb Technology Ltd | Power capacitor |
| WO2005061171A1 (en) * | 2003-12-24 | 2005-07-07 | Maxwell Technologies Sa | Brazing method for achieving a mechanical and electrical connection between two pieces |
| GB2536521A (en) * | 2014-10-31 | 2016-09-21 | Deere & Co | Capacitor with improved heat dissipation |
| US9831035B2 (en) | 2014-10-31 | 2017-11-28 | Deere & Company | Capacitor with improved heat dissipation |
| GB2536521B (en) * | 2014-10-31 | 2019-06-19 | Deere & Co | Capacitor with improved heat dissipation |
| US10418177B2 (en) | 2014-10-31 | 2019-09-17 | Deere & Company | Capacitor with improved heat dissipation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2159329B (en) | 1988-03-09 |
| GB8505321D0 (en) | 1985-04-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 20050228 |