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EP2811495B1 - Transformateur - Google Patents

Transformateur Download PDF

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Publication number
EP2811495B1
EP2811495B1 EP13170704.4A EP13170704A EP2811495B1 EP 2811495 B1 EP2811495 B1 EP 2811495B1 EP 13170704 A EP13170704 A EP 13170704A EP 2811495 B1 EP2811495 B1 EP 2811495B1
Authority
EP
European Patent Office
Prior art keywords
transformer
magnetic
return path
magnetic core
gap
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.)
Not-in-force
Application number
EP13170704.4A
Other languages
German (de)
English (en)
Other versions
EP2811495A1 (fr
Inventor
Volker Heise
Andreas Aye
Gerard J. Kneppers
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.)
BorgWarner Luxembourg Automotive Systems SA
Original Assignee
Delphi Automotive Systems Luxembourg SA
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 Delphi Automotive Systems Luxembourg SA filed Critical Delphi Automotive Systems Luxembourg SA
Priority to EP13170704.4A priority Critical patent/EP2811495B1/fr
Publication of EP2811495A1 publication Critical patent/EP2811495A1/fr
Application granted granted Critical
Publication of EP2811495B1 publication Critical patent/EP2811495B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/12—Magnetic shunt paths
    • 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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

Definitions

  • This disclosure relates to a transformer and has particular, but not exclusive application, to a transformer for an ignition apparatus or coil, such as for, but not limited to, automotive applications.
  • the transformers generally include a core of magnetic highly permeable material, around which primary and secondary windings are located.
  • a closed magnetic return path is provided by a generally C or U shaped magnetic return path element, the magnetic core being located between two end faces of the return path element.
  • Preferred materials for the magnetic core and for the magnetic return path element are laminated metal sheets.
  • one end of the magnetic core directly abuts or contacts one end face of the magnetic return path element.
  • a magnet or simply an air-gap Between the other end face of the magnetic return path element and the other end of the core is typically located a magnet or simply an air-gap.
  • Magnetic saturation zones can be created at interfaces between the magnetic return path element and the magnetic core. Saturation is built-up inside the magnetic return path element, around the interface region to the magnetic core. Generally such saturation causes a problem in that it limits the performance of the entire magnetic circuit.
  • Known solutions are to increase the cross-sections of the magnetic path element or use magnetic material with higher magnetic permeability. Either solution is not desired because it increases weight, volume and/or cost.
  • Documents US 2004/085174A1 and US 2004/085173A1 disclose a transformer device comprising bulk amorphous metal.
  • Figure 1 shows a simple transformer according to one embodiment of the invention.
  • the transformer comprises a magnetic core 12, a primary winding 14 and secondary winding 16, a magnetic return path element 18 and a first gap component 30.
  • the magnetic core 12 extending along a longitudinal axis 'A' is generally cylindrical in overall shape and includes two ends 20 and 22.
  • the magnetic return path element 18 is configured to provide a high permeability magnetic return path, and has a base section 24 and two end faces 26 and 28.
  • the typical width for gap component 30 is 0.5 to 2 mm. Gap components could have different thickness.
  • a second gap component 34 is located symmetrically to the first gap component 30. More precisely, the first and the second gap component 30 and 34 are located between each end faces of section 26 and 28 of the magnetic return path element 18 and the respective ends 20 and 22 of the magnetic core 12.
  • the magnetic core 12 in combination with the magnetic return path element 18, and gap components form a magnetic circuit having a high magnetic permeability.
  • the two gap components 30 and 34 may be formed from ceramic or other material. Preferably this material has a heat conductivity greater than 1 W/m/K.
  • the choice of using heat conducting material for one or two gap components 30 and 34 can be selected to dissipate heat generated by the primary winding 14 and the secondary winding 16 from the magnetic core 12 to the magnetic return path element 18 either with a preferential direction or symmetrically.
  • the gap components 30 and 34 are formed from materials such as ceramics; for example ceramics including aluminum-oxide, aluminum-nitrides or any similar materials.
  • the additional second gap component 34 arranged symmetrically about the transverse axis 'B' to the first gap component 30 in the magnetic core 12, allows balancing of the magnetic circuit and by this allows an increase the total flux of the circuit.
  • one gap component could be realized by a permanent magnetic material, whereas the second gap could be made out of any filling material, preferably with high thermal conductivity.
  • This transformer topology increases the output performance of the transformer 10 and provides for a smaller more compact transformer.
  • FIG. 2 shows a transformer according to another embodiment of the invention.
  • the transformer comprises again a magnetic core 12, a primary winding 14 and secondary winding 16, a magnetic return path element 18 and two gap components 30 and 34.
  • the transformer is encapsulated within e.g. an epoxy material 32 with typical heat conductivities in the range of 0.1 to 1 W/m/K, to provide electrical insulation.
  • the two gap components 30 and 34 encapsulated inside the epoxy 32 potting material may be provided by spacers.
  • the two gap components allow balancing of the magnetic circuit and by this allow an increase the total flux of the circuit.
  • the spacers provide the advantage of a lighter transformer.
  • the epoxy potting material 32 also provides protection from environmental factors which may be encountered during the service life of the transformer. During the operation of the transformer 10, heat is created dominantly by ohmic losses of the primary winding 14 and secondary winding 16. This heat is conducted through the epoxy 32 encapsulation of the transformer to the surface.
  • the transformer 10 mays have an insulating plastic housing 38 in order to attach, for instance, connectors. This transformer topology increases the output performance of the transformer 10 or to further miniaturize its magnetic circuit.
  • FIG. 3 illustrates a further refined and preferred embodiment of the invention.
  • the drawing shows similar components and reference numerals as before.
  • the embodiment further however includes a heat sink 36 and an electronic circuit board 40.
  • the heat sink 36 may be attached to the magnetic return path element 18 providing a large surface to reduce the internal temperature of the primary winding 14 and secondary winding 16 during transformer operation.
  • the heat sink 36 can be attached by means of an over-mold, welding, clamping directly or any similar method, to the magnetic return path element18.
  • the heat sink 36 is preferably made of magnetic or non-magnetic metal material and allows heat to flow outside of the plastic housing 38.
  • the heat sink 36 may have additional means to attach to an integrated electronic circuit board 40 and serves by this for dissipating the heat from the electronic circuit board 40.
  • the electronic circuit board is preferably used as an electronic control board for the ignition coil comprising the transformer 10.
  • the heat sink 36 may further be formed as a bracket that can be fixed to a vehicle chassis.
  • the bracket can be split into at least two individual elements.
  • the thickness and contact surface of the heat sink 36 can be varied so as to provide desired heat dissipation requirements.
  • the shape of the heat sink 36 is preferably conforms to the shape of the outer surface of the magnetic return path element 18.
  • ignition coil topology allows balancing the magnetic circuit and by this allows increasing the total flux of the circuit. This can be used either to increase the output performance or to further miniaturize the magnetic circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (13)

  1. Transformateur (10) comprenant:
    un noyau magnétique (12) s'étendant le long d'un axe longitudinal (A), ayant une forme globale cylindrique et incluant deux extrémités (20, 22) formant deux surfaces radiales opposées ;
    un élément formant trajet de retour magnétique (18) en forme de U ayant une base (24) et deux branches et réalisant un trajet de retour magnétique pour le noyau magnétique (12) ; ledit noyau magnétique étant placé entre deux faces d'extrémité internes (26, 28) des deux branches de l'élément formant trajet de retour magnétique (18) en forme de U ;
    un bobinage ou enroulement primaire (14) qui entoure le noyau magnétique (12) ;
    un bobinage ou enroulement secondaire (16) qui entoure le bobinage/enroulement primaire (14) ;
    un premier composant formant intervalle (30) placé entre une extrémité (20) du noyau magnétique (12) et une face d'extrémité interne correspondante (26) de l'élément formant trajet de retour magnétique (18) ;
    un second composant formant intervalle (34) placé entre l'autre extrémité (22) du noyau magnétique (12) et l'autre face d'extrémité interne correspondante (28) de l'élément formant trajet de retour magnétique (18).
  2. Transformateur (10) selon la revendication 1, dans lequel ledit second composant formant intervalle (34) est situé symétriquement au premier composant formant intervalle (30) dans le noyau magnétique (12) par rapport à un axe perpendiculaire à l'axe du noyau.
  3. Transformateur (10) selon l'une quelconque des revendications précédentes, dans lequel le noyau magnétique (12), l'élément formant trajet de retour magnétique (18), l'enroulement primaire (14) et l'enroulement secondaire (16) sont encapsulés.
  4. Transformateur (10) selon la revendication 3, dans lequel le matériau d'encapsulation est une résine époxy (32).
  5. Transformateur (10) selon l'une quelconque des revendications précédentes, dans lequel l'un au moins des composants formant intervalle (30, 34) est formé d'un matériau électriquement isolant.
  6. Transformateur (10) selon l'une quelconque des revendications précédentes, dans lequel l'un au moins des composants formant intervalle (30, 34) est formé d'un matériau avec une conductivité thermique plus élevée que 1 W/m/K.
  7. Transformateur (10) selon l'une quelconque des revendications précédentes, dans lequel les deux composants formant intervalle (30, 34) sont formés d'un matériau céramique.
  8. Transformateur (10) selon la revendication 7, dans lequel ledit matériau céramique inclut un oxyde d'aluminium ou des nitrures d'aluminium.
  9. Transformateur (10) selon l'une quelconque des revendications précédentes, incluant en outre un puits de chaleur (36) entourant une portion substantielle dudit transformateur (10).
  10. Transformateur (10) selon la revendication 9, dans lequel ledit puits de chaleur inclut une monture.
  11. Transformateur (10) selon les revendications 9 ou 10, dans lequel une carte électronique (40) est attachée au puits de chaleur (36).
  12. Transformateur (10) selon l'une quelconque des revendications précédentes, incluant un boîtier isolant (38).
  13. Bobine d'allumage incluant un transformateur (10) selon l'une quelconque des revendications précédentes.
EP13170704.4A 2013-06-05 2013-06-05 Transformateur Not-in-force EP2811495B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13170704.4A EP2811495B1 (fr) 2013-06-05 2013-06-05 Transformateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13170704.4A EP2811495B1 (fr) 2013-06-05 2013-06-05 Transformateur

Publications (2)

Publication Number Publication Date
EP2811495A1 EP2811495A1 (fr) 2014-12-10
EP2811495B1 true EP2811495B1 (fr) 2017-01-11

Family

ID=48613433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13170704.4A Not-in-force EP2811495B1 (fr) 2013-06-05 2013-06-05 Transformateur

Country Status (1)

Country Link
EP (1) EP2811495B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200273618A1 (en) * 2017-07-13 2020-08-27 Diamond Electric Mfg. Corp. Electro-magnetic devices and thermal management thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622344B2 (fr) * 1987-03-04 1995-05-19 Equipements Electriques Moteur Transformateur electrique, en particulier bobine d'allumage pour moteur a combustion interne
EP0913841A1 (fr) * 1997-10-30 1999-05-06 Ford Motor Company Mécanisme de support pour un appareil électromagnétique
US6737951B1 (en) * 2002-11-01 2004-05-18 Metglas, Inc. Bulk amorphous metal inductive device
US6873239B2 (en) * 2002-11-01 2005-03-29 Metglas Inc. Bulk laminated amorphous metal inductive device
JP5739348B2 (ja) * 2009-12-25 2015-06-24 株式会社タムラ製作所 リアクトル及びその製造方法
JP5689338B2 (ja) * 2011-03-08 2015-03-25 株式会社日立製作所 リアクトル装置、およびこのリアクトル装置を用いた電力変換装置
CN202258665U (zh) * 2011-08-17 2012-05-30 桐乡中欣化纤有限公司 变压器辅助散热装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2811495A1 (fr) 2014-12-10

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