EP0562469B1 - Transformateur de puissance à petite capacité, isolé contre le contact direct - Google Patents

Transformateur de puissance à petite capacité, isolé contre le contact direct Download PDF

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Publication number
EP0562469B1
EP0562469B1 EP93104501A EP93104501A EP0562469B1 EP 0562469 B1 EP0562469 B1 EP 0562469B1 EP 93104501 A EP93104501 A EP 93104501A EP 93104501 A EP93104501 A EP 93104501A EP 0562469 B1 EP0562469 B1 EP 0562469B1
Authority
EP
European Patent Office
Prior art keywords
casing
low power
transformer
housing
core
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
Application number
EP93104501A
Other languages
German (de)
English (en)
Other versions
EP0562469A1 (fr
Inventor
Peter Horn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knobel AG Lichttechnische Komponenten
Original Assignee
Knobel AG Lichttechnische Komponenten
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Knobel AG Lichttechnische Komponenten filed Critical Knobel AG Lichttechnische Komponenten
Publication of EP0562469A1 publication Critical patent/EP0562469A1/fr
Application granted granted Critical
Publication of EP0562469B1 publication Critical patent/EP0562469B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F27/02—Casings
    • H01F27/025—Constructional details relating to cooling
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/085—Cooling by ambient air

Definitions

  • the invention relates to a low-power transformer insulated against contact.
  • an ignition coil which has a heat sink with cooling fins made of metal, which is inserted into a plastic housing and protrudes therefrom.
  • the invention has for its object to provide a low-power transformer insulated against contact, which does not have the disadvantages mentioned.
  • the transformer should be inexpensive to manufacture and the heat generated during operation should be easy to dissipate.
  • the plastic housing is in direct contact with the laminated core of the transformer and acts on it in a resilient manner results in very good heat transfer from the laminated core to the plastic housing. Since this has formations that enlarge the surface on its outside, the heat can be given off well to the surroundings. Since the plastic housing lies directly on the laminated core, no potting compound is required and the corresponding expensive work step not applicable. This also makes mounting the housing on the transformer particularly easy.
  • the housing preferably consists of two sleeves, which are each pushed onto the transformer from the opposite side and which snap onto the base plate of the transformer. At the point at which the two sleeves lie opposite one another, a third housing part is provided which covers the separation point. This arrangement results in a particularly simple assembly. Furthermore, transformers of different lengths can be provided with a housing with the same sleeve parts, in that only the middle part has to be made more or less wide.
  • FIG. 1 shows a low-power transformer uncut and its housing in vertical longitudinal section.
  • the laminated core 1 of the transformer can be seen, which is arranged on a base plate 4.
  • the bottom plate 4 engages on both sides in lateral grooves of the laminated core 1 and holds it together.
  • the two winding heads of the coils emerging from the end of the laminated core are covered on one side with an end cap 2 and on the other end side with one Connection cap 3, which carries the connection terminals of the transformer.
  • the housing of the transformer consists of a first sleeve 5 made of plastic and a second sleeve 6 made of plastic, which are pushed onto the laminated core 1 from the two end faces thereof.
  • the sleeves are preferably fixed to the base plate 4, as will be shown below. Between the two sleeves 5, 6, a middle housing part 7 is provided, which overlaps both sleeves.
  • a cover 8 is provided on the sleeve 5 so that there is access to the connection terminals of the transformer.
  • Figure 2 shows a vertical longitudinal section through the sleeve 6, which is provided on the outside with a plurality of cooling fins 10, which enlarge the surface of the sleeve 6 in order to dissipate the heat generated by the transformer to the environment.
  • the lower inner surface of the sleeve 6 is provided with a projection 11 which engages in a corresponding recess in the base plate 4. This enables a particularly simple assembly of the housing on the laminated core 1 and the base plate 4 by pushing the sleeve 6 onto the laminated core with the base plate from the front side until the projection 11 engages in the corresponding recess in the base plate.
  • a fastening foot 12 can also be provided on the sleeve for fastening the transformer at its place of use.
  • Figure 3 shows a vertical cross-section through the sleeve 6 along the line AA of Figure 2. Only one half of the sleeve is shown.
  • the outline of the laminated core 1 and the base plate 4 is also partially drawn. It can be seen from this that the inner surface of the plastic housing lies flat against the laminated core so that there is good heat transfer from the laminated core to the plastic housing.
  • the plastic housing is preferably made minimally smaller than the outline of the laminated core with the base plate 4. This results in a slight expansion of the sleeve when inserting the laminated core or resilient contact of the housing inner surfaces on the laminated core, ie a good contact to enable the heat flow.
  • the corner regions 13 and 14 of the housing are accordingly designed such that there is a resilient loading of the laminated core with the base plate through the housing inner surfaces 15, 16 and 17.
  • FIG. 4 shows a vertical longitudinal section through a section of the sleeve 5.
  • the projection 11 is also visible, which is intended to be snapped onto the base plate.
  • the cover 8 is shown, which gives access to the connection terminals of the transformer.
  • This cover 8 is preferably made in one piece with the sleeve 5 and connected to the sleeve by a plastic hinge.
  • the cover 8 can be designed such that it locks into place on the fixed housing when it is closed and can only be opened again by means of a tool.
  • the cover also serves as strain relief for the cables to be connected.
  • plastics for the housing different types of plastic come into consideration as plastics for the housing. Plastics that have good thermal conductivity are preferred.
  • the polyamide material PA 6 is particularly suitable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Insulating Of Coils (AREA)
  • Rectifiers (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Claims (5)

  1. Transformateur de faible puissance, protégé contre l'attouchement, avec un boîtier en plastique entourant entièrement le transformateur, caractérisé en ce que le boîtier en plastique (5, 6) s'applique intimement le long d'une surface contre le paquet de tôles (1, 4), qu'il comporte à son extérieur des profils (10) destinés à évacuer vers l'extérieur la chaleur produite lors du fonctionnement du transformateur, et en ce que le boîtier est conformé de manière à ce qu'au moins une des faces intérieures (15, 16) du boîtier s'appliquant par toute une surface contre le paquet de tôles presse élastiquement contre celui-ci.
  2. Transformateur de faible puissance selon la revendication 1, caractérisé en ce que les profils forment des ailettes (10) s'etendant en direction longitudinale du boîtier.
  3. Transformateur de faible puissance selon une des revendications 1 ou 2, caractérisé en ce que le boîtier comporte deux coques (5, 6) engagées sur le paquet de tôles, et une partie centrale (7) située entre les coques.
  4. Transformateur de faible puissance selon une des revendications 1 à 3, caractérisé en ce qu'une plaque de fond (4) maintient ensemble les tôles du paquet (1) et que le boîtier comporte des protubérances intérieures (11) destinées à s'engager dans des creux de la plaque de fond.
  5. Transformateur de faible puissance selon une des revendications 1 à 4, caractérisé en ce que le boîtier comporte au moins une charnière et un couvercle (8) formant une ouverture du boîtier pouvant être fermée et servant à retenir des câbles conducteurs.
EP93104501A 1992-03-26 1993-03-19 Transformateur de puissance à petite capacité, isolé contre le contact direct Expired - Lifetime EP0562469B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH958/92A CH683214A5 (de) 1992-03-26 1992-03-26 Gegen Berührung isolierter Kleinleistungstransformator.
CH958/92 1992-03-26

Publications (2)

Publication Number Publication Date
EP0562469A1 EP0562469A1 (fr) 1993-09-29
EP0562469B1 true EP0562469B1 (fr) 1996-10-09

Family

ID=4199136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93104501A Expired - Lifetime EP0562469B1 (fr) 1992-03-26 1993-03-19 Transformateur de puissance à petite capacité, isolé contre le contact direct

Country Status (5)

Country Link
EP (1) EP0562469B1 (fr)
AT (1) ATE144070T1 (fr)
CH (1) CH683214A5 (fr)
DE (1) DE59304070D1 (fr)
ES (1) ES2093300T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185811B1 (en) * 1994-08-01 2001-02-13 Hammond Manufacturing Company Method for making a transformer
DE10350617B3 (de) * 2003-10-30 2005-06-30 Vossloh-Schwabe Deutschland Gmbh Versorgungseinheit für Leuchtmittel
ES2275398B1 (es) * 2005-04-18 2008-04-01 Polylux, S.L. Transformador encapsulado de pequeña potencia y su correspondiente procedimiento de fabricacion.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947957A (en) * 1957-04-22 1960-08-02 Zenith Radio Corp Transformers
US3387244A (en) * 1966-05-03 1968-06-04 Hermetic Coil Co Inc Transformer having winding leads held in pressure contact with terminals
GB1268768A (en) * 1968-07-18 1972-03-29 South Wales Switchgear Housing tanks for transformers
AT304690B (de) * 1970-02-05 1973-01-25 Zumtobel Walter Transformator oder Induktionsspule
ES189797Y (es) * 1973-03-17 1974-10-16 Frater, S. A. E. Soporte perfeccionado para reactancias.
DE3149853C1 (de) * 1981-12-16 1983-04-07 May & Christe Gmbh, Transformatorenwerke, 6370 Oberursel Drossel oder Transformator
FR2595415A3 (fr) * 1986-03-06 1987-09-11 Ducellier & Cie Circuit magnetique loge dans un boitier de bobine d'allumage pour moteur a combustion interne
FI78190C (fi) * 1986-07-15 1989-06-12 Helvar Oy Anordning i en drossel eller i en transformator foer att effektivera dess kylning.

Also Published As

Publication number Publication date
EP0562469A1 (fr) 1993-09-29
ATE144070T1 (de) 1996-10-15
ES2093300T3 (es) 1996-12-16
DE59304070D1 (de) 1996-11-14
CH683214A5 (de) 1994-01-31

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