EP0485341B1 - Small transformer, and process for manufacturing same - Google Patents
Small transformer, and process for manufacturing same Download PDFInfo
- Publication number
- EP0485341B1 EP0485341B1 EP91810851A EP91810851A EP0485341B1 EP 0485341 B1 EP0485341 B1 EP 0485341B1 EP 91810851 A EP91810851 A EP 91810851A EP 91810851 A EP91810851 A EP 91810851A EP 0485341 B1 EP0485341 B1 EP 0485341B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- iron core
- covers
- webs
- windings
- small transformer
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000004804 winding Methods 0.000 claims abstract description 25
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000004033 plastic Substances 0.000 abstract description 18
- 229920003023 plastic Polymers 0.000 abstract description 18
- 238000010923 batch production Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000004907 flux Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 241000446313 Lamella Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/266—Fastening or mounting the core on casing or support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
- H01F27/022—Encapsulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
Definitions
- the invention relates to a method for producing a small transformer with a laminated iron core and with primary and secondary windings which are received by a coil former, the central opening of which is penetrated by the iron core, the winding parts projecting beyond the iron core on both sides, each with a lid forming thermoplastic plastic compound are overmolded and the lids are integrally connected to one another by first webs which penetrate and fill the cavities between the windings and the iron core and the laminated iron core is fixed in itself by second webs connecting the two lids and the production in a single operation in one Injection mold is made.
- the invention relates to a small transformer with an iron core, with primary and secondary windings which are received by a coil former, the winding parts projecting beyond the iron core are encapsulated on both sides by a cover made of thermoplastic plastic, the two covers connected to one another by first webs are, which penetrate and fill the cavities between the windings and the iron core and thereby fix the windings and insulate each other, and the cover connecting second webs are present which fix the iron core in itself.
- DE-B-1 140 988 discloses a transformer cast with cold-curing casting resin, in which the mold for casting with the casting resin is formed by two shells, which surround the windings on two sides and the spaces between the two shells and the Iron core and the winding is cast with casting resin. The two shells can remain on the casting. The cumbersome production method with slowly hardening casting resin is not eliminated.
- US-A-3 813 763 relates to a manufacturing method for the stator of an electric motor. Layered lamellae are pressed together in a device to form a package, and in this compressed state, a coil former made of plastic is sprayed on. The coil former is then provided with a single winding. This body is then introduced into a second mold and provided with a plastic housing on the end face. The whole thing is then inserted into a horseshoe-shaped stator, which closes the magnetic flux together with the plate pack.
- DE-A-2 441 864 shows an inductive element with a core made up of lamellae. Side clamps made of plastic are available to hold the core together. Instead of the usual rivets that penetrate the plate pack, holes in the corner area of the plate pack are filled with plastic, which are connected to the clamps.
- the object of the invention is to provide a small transformer which - compared to conventional designs - has
- the plastic injection molding process can be produced very efficiently, is suitable for production in large series, manages with a low consumption of plastic mass and in which the electrical safety distances can be maintained without additional effort despite the compact design.
- the invention makes it possible, on the one hand, to fix the windings in such a way that they cannot move relative to the iron core and, on the other hand, to keep the laminated iron core package in place, so that the riveting with metal rivets, which is otherwise common with laminated iron cores, or the welding of the core package is eliminated.
- the two covers and the associated first and second webs are sprayed on efficiently in a single operation in the plastic injection molding process with comparatively low consumption of plastic. This creates a vibration-resistant product, in which the electrical safety distances can be reliably maintained.
- the small transformer is designed for a power of about 0.2-400 VA. It contains a laminated iron core 2 in the form of a package layered from individual sheets.
- the iron core 2 contains a sheet-metal package 2 'in E-shape, which is supplemented by a sheet-metal packet in I-shape 2 ".
- I-shape 2 " In the assembled state, the sheets of the E- and I-shape lie directly against one another. Further design variants arise by using other sheet metal shapes.
- the middle leg of the E-packet 2 ' is inserted into the cavity 20 of a coil former 5 and then the I-packet 2 "is added to the outside, as can be seen from the figure.
- the two core packs 2', 2" are thereby held by holding cams 10 of the bobbin 5 is supported.
- the bobbin 5 is passed through Support walls 17 and 19 held and separated from each other by a partition 18.
- the two windings 3, 4 and the coil former 5 protrude beyond the iron core 2 on both sides.
- the covers 6, 7 lie against the lamella edges adjacent to the central opening of the iron core.
- the injected plastic also penetrates into the cavities between the windings 3, 4 and the iron core 2 and forms first webs. As a result, the windings 3, 4 are secured in their position in a vibration-resistant manner on the one hand in the coil former 5 and on the other hand in the iron core 2.
- second webs 14 with a curved cross section on the outside of the iron core 2. These are integrally connected to both lids 6, 7 via ribs 8. Thus, the two covers 6, 7 together with the first and second webs form a single, contiguous piece of plastic.
- a first embodiment variant consists in the fact that the second webs 14 each penetrate holes at the corners of the iron core 2, instead of the corresponding webs 14 arranged on the outside at the corners.
- connection between the two covers 6, 7 is made by connecting strands which surround the iron core on the outside.
- a thermal protection element is installed in the coil former 5 to protect against inadmissible heating.
- the features described enable particularly efficient production with little outlay on raw materials and semi-finished products.
- the testing effort and the failure rate can be reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
- Insulating Of Coils (AREA)
- Transformers For Measuring Instruments (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung eines Kleintransformators mit einem lamellierten Eisenkern und mit Primär- und Sekundärwicklungen die von einem Spulenkörper aufgenommen werden, dessen Zentralöffnung vom Eisenkern durchdrungen wird, die den Eisenkern überragenden Wicklungsteile auf beiden Seiten mit je einem Deckel bildenden thermoplastischen Kunststoffmasse umspritzt werden und die Deckel untereinander einstückig durch erste Stege verbunden werden, welche die Hohlräume zwischen den Wicklungen und dem Eisenkern durchdringen und ausfüllen und der lamellierte Eisenkern durch zweite, die beiden Deckel verbindende Stege in sich fixiert wird und die Herstellung in einem einzigen Arbeitsgang in einer Spritzgussform erfolgt.The invention relates to a method for producing a small transformer with a laminated iron core and with primary and secondary windings which are received by a coil former, the central opening of which is penetrated by the iron core, the winding parts projecting beyond the iron core on both sides, each with a lid forming thermoplastic plastic compound are overmolded and the lids are integrally connected to one another by first webs which penetrate and fill the cavities between the windings and the iron core and the laminated iron core is fixed in itself by second webs connecting the two lids and the production in a single operation in one Injection mold is made.
Ferner bezieht sich die Erfindung auf einen Kleintransformator mit einem Eisenkern, mit Primär- und Sekundärwicklungen die von einem Spulenkörper aufgenommen sind, die den Eisenkern überragenden Wicklungsteile beidseitig je von einem aus thermoplastischem Kunststoff bestehenden Deckel umgossen sind, die beiden Deckel untereinander durch erste Stege einstückig verbunden sind, welche die Hohlräume zwischen den Wicklungen und dem Eisenkern durchdringen und ausfüllen und dabei die Wicklungen fixieren und gegenseitig isolieren, und die Deckel verbindende, zweite Stege vorhanden sind, welche den Eisenkern in sich fixieren.Furthermore, the invention relates to a small transformer with an iron core, with primary and secondary windings which are received by a coil former, the winding parts projecting beyond the iron core are encapsulated on both sides by a cover made of thermoplastic plastic, the two covers connected to one another by first webs are, which penetrate and fill the cavities between the windings and the iron core and thereby fix the windings and insulate each other, and the cover connecting second webs are present which fix the iron core in itself.
Es ist bekannt, Kleintransformatoren in vollständig vergossener Form herzustellen, wobei der Eisenkern samt Spulen aussen von einem Kunststoff-Gehäuse umgossen wird. Dabei wird von der offenen Gehäuseseite her ein aushärtender Kunststoff drucklos eingefüllt, sodass der Transformator bis zum Gehäuserand vollständig von Kunststoff umgeben ist. Nachteilig ist jedoch, dass eine relativ grosse Kunststoff-Masse benötigt wird, sowie das umständliche und langsame Herstellungsverfahren, da die für diese Zwecke geeigneten Zweikomponenten-Kunststoffe nur langsam - über Stunden - aushärten. Ein weiterer Nachteil liegt in der schlechten Wärmeableitung als Folge der den Eisenkern allseitig umgebenden Kunststoff-Schicht.It is known to produce small transformers in a completely encapsulated form, the iron core including coils on the outside of a plastic housing is cast around. A hardening plastic is filled from the open housing side without pressure, so that the transformer is completely surrounded by plastic up to the edge of the housing. However, it is disadvantageous that a relatively large plastic mass is required, as well as the cumbersome and slow production process, since the two-component plastics suitable for these purposes harden only slowly - over hours. Another disadvantage is the poor heat dissipation as a result of the plastic layer surrounding the iron core on all sides.
Aus DE-B-1 140 988 ist ein mit kalt härtendem Giessharz vergossener Transformator bekannt, bei dem die Form für das Vergiessen mit dem Giessharz durch zwei Schalen gebildet wird, welche die Wicklungen auf zwei Seiten umgeben und die Zwischenräume zwischen den beiden Schalen sowie dem Eisenkern und der Wicklung mit Giessharz ausgegossen wird. Dabei können die beiden Schalen am Giessling verbleiben. Die umständliche Herstellungsweise mit langsam aushärtendem Giessharz wird dadurch nicht behoben.DE-B-1 140 988 discloses a transformer cast with cold-curing casting resin, in which the mold for casting with the casting resin is formed by two shells, which surround the windings on two sides and the spaces between the two shells and the Iron core and the winding is cast with casting resin. The two shells can remain on the casting. The cumbersome production method with slowly hardening casting resin is not eliminated.
Die US-A-3 813 763 bezieht sich auf ein Herstellungsverfahren für den Stator eines Elektromotores. Dabei werden geschichtete Lamellen in einer Vorrichtung zu einem Paket zusammengepresst und in diesem zusammengepressten Zustand wird ein aus Kunststoff bestehender Spulenkörper aufgespritzt. Hernach wird der Spulenkörper mit einer einzigen Wicklung versehen. Alsdann wird dieser Körper in eine zweite Form eingebracht und stirnseitig mit einem Kunststoffgehäuse versehen. Anschliessend wird das Ganze in einen hufeisenförmigen Stator eingesetzt, welcher den Magnetfluss zusammen mit dem Lamellenpaket schliesst.US-A-3 813 763 relates to a manufacturing method for the stator of an electric motor. Layered lamellae are pressed together in a device to form a package, and in this compressed state, a coil former made of plastic is sprayed on. The coil former is then provided with a single winding. This body is then introduced into a second mold and provided with a plastic housing on the end face. The whole thing is then inserted into a horseshoe-shaped stator, which closes the magnetic flux together with the plate pack.
Die DE-A-2 441 864 zeigt ein induktives Element mit einem aus Lamellen aufgebauten Kern. Zum Zusammenhalten des Kernes sind seitliche Bügelklemmen aus Kunststoff vorhanden. An Stelle der sonst üblichen, das Lamellenpaket durchdringenden Nieten sind Bohrungen im Eckbereich des Lamellenpaketes mit Kunststoff ausgefüllt, welche mit den Bügelklemmen verbunden sind.DE-A-2 441 864 shows an inductive element with a core made up of lamellae. Side clamps made of plastic are available to hold the core together. Instead of the usual rivets that penetrate the plate pack, holes in the corner area of the plate pack are filled with plastic, which are connected to the clamps.
Mit der Erfindung soll die Aufgabe gelöst werden, einen Kleintransformator zu schaffen, der - gegenüber konventionellen Ausführungen - unter Verwendung des Kunststoff-Spritzgussverfahrens sehr rationell herstellbar ist, sich zur Herstellung in grossen Serien eignet, mit einem geringen Verbrauch an Kunststoffmasse auskommt und bei dem die elektrischen Sicherheitsabstände trotz gedrängter Bauart ohne zusätzlichen Aufwand eingehalten werden können.The object of the invention is to provide a small transformer which - compared to conventional designs - has The plastic injection molding process can be produced very efficiently, is suitable for production in large series, manages with a low consumption of plastic mass and in which the electrical safety distances can be maintained without additional effort despite the compact design.
Durch die Erfindung ist es möglich, einerseits die Wicklungen relativ zum Eisenkern verschiebungsfest zu fixieren und andererseits das lamellierte Eisenkernpaket verschiebungsfest zu halten, wobei die sonst bei lamellierten Eisenkernen übliche, den Magnetfluss störende Vernietung mit Metallnieten oder das Verschweissen des Kernpaketes wegfällt. Das Aufspritzen der beiden Deckel und der mit diesen zusammenhängenden ersten und zweiten Stege erfolgt rationell in einem einzigen Arbeitsgang im Kunststoff-Spritzgussverfahren mit vergleichsweise geringem Verbrauch an Kunststoff. Dabei entsteht ein vibrationsfestes Produkt, bei dem die elektrischen Sicherheitsabstände zuverlässig eingehalten werden können.The invention makes it possible, on the one hand, to fix the windings in such a way that they cannot move relative to the iron core and, on the other hand, to keep the laminated iron core package in place, so that the riveting with metal rivets, which is otherwise common with laminated iron cores, or the welding of the core package is eliminated. The two covers and the associated first and second webs are sprayed on efficiently in a single operation in the plastic injection molding process with comparatively low consumption of plastic. This creates a vibration-resistant product, in which the electrical safety distances can be reliably maintained.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt, das nachstehend näher beschrieben wird. Es zeigt:
- Fig. 1
- die Herstellungsstufen des Kleintransformators in auseinandergezogener, perspektivischer Darstellung.
- Fig. 1
- the stages of manufacture of the small transformer in an exploded, perspective view.
Der Kleintransformator ist für eine Leistung von etwa 0,2-400 VA vorgesehen. Er enthält einen laminierten Eisenkern 2 in Form eines aus einzelnen Blechen geschichteten Paketes. Der Eisenkern 2 enthält ein Blech-Paket 2' in E-Form, das durch ein Blech-Paket in I-Form 2" ergänzt wird. Im zusammengebauten Zustand liegen die Bleche der E- und I-Form direkt aneinander an. Weitere Ausführungsvarianten entstehen durch die Verwendung anderer Blechformen.The small transformer is designed for a power of about 0.2-400 VA. It contains a laminated
Der mittlere Schenkel des E-Paketes 2' wird in den Hohlraum 20 eines Spulenkörpers 5 eingeschoben und hernach das I-Paket 2" aussen angefügt, wie dies aus der Figur hervorgeht. Dabei werden die beiden Kern-Pakete 2', 2" durch Haltenocken 10 des Spulenkörpers 5 gestützt. Vor dem Einsetzen des Eisenkernes 2 werden auf den Spulenkörper 5 durch Stützwände 17 und 19 gehalten und durch eine Trennwand 18 voneinander getrennt.The middle leg of the E-packet 2 'is inserted into the
Die beiden Wicklungen 3,4 und der Spulenkörper 5 überragen den Eisenkern 2 auf beiden Seiten. Auf diese beiden den Eisenkern 2 überragenden Wicklungsteile wird je ein Deckel 6,7 aus einem thermoplastischen Kunststoff, vorzugsweise aus Polyamid, in einer Spritzgussform aufgespritzt. Damit die Luft gut entweichen kann, wird der flüssige Kunststoff nur von einer Seite her, vorzugsweise von der einen Deckelmitte her, eingespritzt. Die Deckel 6,7 liegen gegen die der Zentralöffnung des Eisenkernes benachbarten Lamellenränder an. Der eingespritzte Kunststoff dringt auch in die Hohlräume zwischen den Wicklungen 3,4 und dem Eisenkern 2 ein und bilden erste Stege. Dadurch werden die Wicklungen 3,4 einerseits im Spulenkörper 5 und andererseits im Eisenkern 2 in ihrer Lage vibrationsfest gesichert.The two windings 3, 4 and the coil former 5 protrude beyond the
Damit auch der laminierte Eisenkern 2 in sich sicher zusammengehalten wird und Schweissnähte oder Metallnieten, welche den Magnetfluss stören würden, vermieden werden, sind auf der Aussenseite des Eisenkerns 2 an den Ecken zweite, im Querschnitt gewölbte Stege 14 vorhanden. Diese sind mit beiden Deckeln 6,7 je über Rippen 8 einstückig verbunden. Somit bilden die beiden Deckel 6,7 zusammen mit den ersten und zweiten Stegen ein einziges zusammenhängendes Kunststoff-Stück.So that the laminated
Eine erste Ausführungsvariante besteht darin, dass die zweiten Stege 14 Bohrungen je an den Ecken des Eisenkernes 2 durchdringen, an Stelle der aussen an den Ecken angeordneten entsprechenden Stege 14.A first embodiment variant consists in the fact that the
Eine zweite Ausführungsvariante besteht, dass die Verbindung zwischen den beiden Deckeln 6,7 durch Verbindungsstränge erfolgt, welche den Eisenkern aussen umgeben.A second embodiment variant is that the connection between the two covers 6, 7 is made by connecting strands which surround the iron core on the outside.
Zum Schutz gegen unzulässige Erwärmung ist im Spulenkörper 5 ein Thermoschutzelement eingebaut.A thermal protection element is installed in the coil former 5 to protect against inadmissible heating.
Die beschriebenen Merkmale ermöglichen eine besonders rationelle Herstellung mit geringem Aufwand an Rohmaterialien und Halbfabrikaten. Zudem kann der Prüfaufwand und die Ausfallquote vermindert werden.The features described enable particularly efficient production with little outlay on raw materials and semi-finished products. In addition, the testing effort and the failure rate can be reduced.
Claims (4)
- Process for manufacturing a small transformer with an iron core (2) consisting of E-shaped and I-shaped plates, with primary and secondary windings (3, 4) which are wound on a coil former (5), after which the central limb of the laminated iron core (2) is placed into the central opening (20) of the coil former (5) and is formed from the E-shaped and I-shaped plates of the iron core, onto the winding sections projecting beyond the iron core (2), a cover (6, 7) of a thermoplastic plastic compound is then sprayed on, which covers these winding sections, the covers (6, 7) lying against the plate rims adjacent to the central opening, the covers (6, 7) being joined to each other in one piece by first webs, which penetrate and fill up the cavities between the windings (3, 4) and the iron core (2). The laminated iron core (2) is fixed in it by second webs which join the two covers (6, 7), and the manufacture of the covers and the first and second webs takes place in one single operation in an injection mould.
- Small transformer with an iron core (2) made of E-shaped and I-shaped plates, with primary and secondary windings (3, 4) which are held by a coil former (5) having a central opening, the central limb of the E-shaped plates penetrating the central opening (20) of the coil former (5), the winding section (3, 4) projecting beyond the iron core (2) on both sides being encapsulated in each case by covers (6, 7) made of thermoplastic plastics, covering these winding sections, the covers (6, 7) lying against the rims of the plates adjacent to the central opening, the two covers (6, 7) being joined to each other by first webs in one piece, which penetrate and fill up the cavities between the windings (3, 4) and the iron core (2) and, in doing this, fix the windings (3, 4) and insulate them against each other, and second webs joining the two covers (6, 7) being present, which fix the iron core (2) in them.
- Small transformer according to Claim 2, characterized in that the second webs (14) enclose the iron core (2) externally and connect the covers (6, 7).
- Small transformer according to Claim 2, characterized in that drilled holes pass through the second webs at the corners of the iron core (2) and are joined to the covers (6, 7) in one piece.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH353690 | 1990-11-07 | ||
CH3536/90 | 1990-11-07 | ||
CH2853/91 | 1991-09-26 | ||
CH285391 | 1991-09-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0485341A1 EP0485341A1 (en) | 1992-05-13 |
EP0485341B1 true EP0485341B1 (en) | 1996-04-17 |
Family
ID=25691567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91810851A Expired - Lifetime EP0485341B1 (en) | 1990-11-07 | 1991-11-04 | Small transformer, and process for manufacturing same |
Country Status (11)
Country | Link |
---|---|
US (2) | US5483405A (en) |
EP (1) | EP0485341B1 (en) |
JP (1) | JP2832769B2 (en) |
CN (1) | CN1030592C (en) |
AT (1) | ATE137050T1 (en) |
CA (1) | CA2055010C (en) |
DE (1) | DE59107683D1 (en) |
DK (1) | DK0485341T3 (en) |
ES (1) | ES2088789T3 (en) |
GR (1) | GR3020526T3 (en) |
TW (1) | TW233367B (en) |
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CA2114564C (en) * | 1993-02-05 | 1998-05-26 | Shigeo Ichida | Transformer unit and coil case and coil bobbin for use therefor |
AU4617696A (en) * | 1995-02-15 | 1996-09-04 | Electronic Craftsmen Limited | Transformer and method of assembly |
JP2925998B2 (en) * | 1996-02-29 | 1999-07-28 | 三洋電機株式会社 | Charger |
DE19923360B4 (en) * | 1999-05-21 | 2010-01-07 | Werner Turck Gmbh & Co. Kg | Voltage transformer with a potential separation protection |
US6271742B1 (en) | 1999-07-27 | 2001-08-07 | Aspro Technology Ag | Mains adapter and method for its production |
MY120386A (en) * | 1999-07-28 | 2005-10-31 | Samsung Electronics Co Ltd | High voltage transformer for microware oven and method of manufacturing therefor. |
JP2001332418A (en) * | 2000-05-23 | 2001-11-30 | Sanden Corp | Coil bobbin |
KR20040068680A (en) * | 2003-01-27 | 2004-08-02 | 삼성전자주식회사 | High voltage transformer |
ES2257156B1 (en) * | 2004-07-15 | 2007-07-16 | Jose Cambronero Garcia | FIRST CERTIFICATE OF ADDITION TO THE PATENT 200101129: TRANSFORMER PROTECTED BY COVERS AND BAND OF ELASTIC MATERIAL ISOLATED WITH DOUBLE ANCHORAGE SYSTEM, TO BANKING AND TO LANE AND A SINGLE ROW OF TERMINALS. |
JP5916298B2 (en) * | 2011-03-30 | 2016-05-11 | 株式会社タムラ製作所 | Coil device |
CN103310967B (en) * | 2013-06-27 | 2015-10-21 | 慈溪市国兴电子有限公司 | A kind of production method of transformer for switching power supply |
CN108682543B (en) * | 2018-05-09 | 2024-07-02 | 浙江富特科技股份有限公司 | Planar transformer |
CN108820746A (en) * | 2018-07-28 | 2018-11-16 | 合肥市菲力克斯电子科技有限公司 | A kind of locking transfer positioning system of transformer framework |
GB2611596B (en) * | 2021-01-15 | 2023-11-01 | Zhongbian Group Shanghai Transf Co Ltd | Dry-type transformer with elliptical iron core |
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BE565112A (en) * | ||||
GB845780A (en) * | 1957-11-07 | 1960-08-24 | Gen Electric Co Ltd | Improvements in or relating to methods of encapsulating electrical devices |
DE1140988B (en) * | 1960-12-02 | 1962-12-13 | Goltermann | Transformer or choke encapsulated with resin |
US3445797A (en) * | 1967-03-16 | 1969-05-20 | Mallory & Co Inc P R | Inductor coil and bobbin with terminals |
US3516040A (en) * | 1968-08-05 | 1970-06-02 | Micron Sealing Corp | Transformer structure |
US3813763A (en) * | 1970-12-17 | 1974-06-04 | Gen Electric | Laminated structure with insulating member formed in situ thereon and method for making same |
US3665358A (en) * | 1971-02-09 | 1972-05-23 | Collins Radio Co | Reactor coil form |
US4156222A (en) * | 1971-05-05 | 1979-05-22 | Commerzstahl Handelsgesellschaft Mbh | Transformer with divided primary |
NL7312739A (en) * | 1973-09-14 | 1975-03-18 | Philips Nv | INDUCTIVE ELEMENT WITH A BLADE BUILT |
US3821678A (en) * | 1973-10-02 | 1974-06-28 | Westinghouse Electric Corp | Transformer having a cast winding structure with integral insulating barriers |
FR2321054A1 (en) * | 1975-08-14 | 1977-03-11 | Sev Marchal | IGNITION COIL |
US4107636A (en) * | 1977-05-20 | 1978-08-15 | Jerome Industries Corporation | Plug-in adaptor |
US4199743A (en) * | 1978-02-06 | 1980-04-22 | Westinghouse Electric Corp. | Encapsulated current transformer |
DE3505367A1 (en) * | 1985-02-15 | 1986-08-28 | Daimler-Benz Ag, 7000 Stuttgart | IGNITION COIL FOR INTERNAL COMBUSTION ENGINES |
JPS63142622A (en) * | 1986-12-04 | 1988-06-15 | Nippon Denso Co Ltd | Ignition coil for internal combustion engine |
JPH0723934Y2 (en) * | 1989-03-13 | 1995-05-31 | ティーディーケイ株式会社 | Inductance element |
JP2504205B2 (en) * | 1989-07-24 | 1996-06-05 | 株式会社村田製作所 | Inductance components |
US5088186A (en) * | 1990-03-13 | 1992-02-18 | Valentine Engineering, Inc. | Method of making a high efficiency encapsulated power transformer |
-
1991
- 1991-11-04 DK DK91810851.5T patent/DK0485341T3/en active
- 1991-11-04 DE DE59107683T patent/DE59107683D1/en not_active Expired - Fee Related
- 1991-11-04 ES ES91810851T patent/ES2088789T3/en not_active Expired - Lifetime
- 1991-11-04 AT AT91810851T patent/ATE137050T1/en not_active IP Right Cessation
- 1991-11-04 EP EP91810851A patent/EP0485341B1/en not_active Expired - Lifetime
- 1991-11-06 CA CA002055010A patent/CA2055010C/en not_active Expired - Fee Related
- 1991-11-07 CN CN91111511.0A patent/CN1030592C/en not_active Expired - Fee Related
- 1991-11-07 JP JP3318635A patent/JP2832769B2/en not_active Expired - Fee Related
- 1991-12-03 TW TW080109519A patent/TW233367B/zh active
-
1994
- 1994-09-21 US US08/310,034 patent/US5483405A/en not_active Expired - Fee Related
-
1995
- 1995-06-05 US US08/465,008 patent/US5577316A/en not_active Expired - Fee Related
-
1996
- 1996-07-12 GR GR960401889T patent/GR3020526T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
TW233367B (en) | 1994-11-01 |
EP0485341A1 (en) | 1992-05-13 |
CA2055010C (en) | 1998-05-19 |
DK0485341T3 (en) | 1996-08-05 |
US5483405A (en) | 1996-01-09 |
ES2088789T3 (en) | 1996-09-16 |
CN1062428A (en) | 1992-07-01 |
DE59107683D1 (en) | 1996-05-23 |
JPH0513251A (en) | 1993-01-22 |
US5577316A (en) | 1996-11-26 |
GR3020526T3 (en) | 1996-10-31 |
JP2832769B2 (en) | 1998-12-09 |
ATE137050T1 (en) | 1996-05-15 |
CN1030592C (en) | 1995-12-27 |
CA2055010A1 (en) | 1992-05-08 |
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