EP2811495A1 - Transformateur - Google Patents
Transformateur Download PDFInfo
- Publication number
- EP2811495A1 EP2811495A1 EP13170704.4A EP13170704A EP2811495A1 EP 2811495 A1 EP2811495 A1 EP 2811495A1 EP 13170704 A EP13170704 A EP 13170704A EP 2811495 A1 EP2811495 A1 EP 2811495A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- magnetic
- return path
- magnetic core
- path element
- 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
- 238000004804 winding Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims description 17
- 229940024548 aluminum oxide Drugs 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 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
- 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.
- a transformer comprises a magnetic core and a magnetic return path element providing a magnetic return path for the magnetic core.
- the magnetic core is generally located between two end faces of the magnetic return path element.
- a primary coil or winding surrounds the magnetic core.
- a secondary coil or winding surrounds the primary winding/coil.
- a first gap component is located between one end of the magnetic core and one corresponding end face of the magnetic return path element.
- a second gap component is located between the other end of the magnetic core and the corresponding other end face of the magnetic return path element. The second gap component is located symmetrically to the first gap component in the magnetic core about an axis perpendicular to the core axis.
- the magnetic core, the magnetic return path element, the primary winding and the secondary winding are encapsulated by an encapsulated material which is an epoxy resin.
- the gap components comprises spacers encapsulated inside the epoxy resin material.
- the two gap components are formed from an electrical isolating material and at least for one spacer from a material with a thermal conductivity greater than 1 W/m/K.
- the two gap components are formed from a ceramic material including aluminum-oxide or aluminum-nitrides.
- a heat sink surrounds a substantial portion of the transformer.
- the heat sink includes a bracket.
- An electronic board is attached to the heat sink.
- the transformer includes an insulating housing.
- An ignition coil includes a transformer.
- 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)
- Coils Or Transformers For Communication (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
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 true EP2811495A1 (fr) | 2014-12-10 |
| EP2811495B1 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019014578A1 (fr) * | 2017-07-13 | 2019-01-17 | Diamond Electric Mfg. Corp. | Dispositifs électromagnétiques et leur gestion thermique |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0283354A1 (fr) * | 1987-03-04 | 1988-09-21 | Sagem Allumage | Transformateur électrique, en particulier bobine d'allumage pour moteur à combustion interne |
| EP0913841A1 (fr) * | 1997-10-30 | 1999-05-06 | Ford Motor Company | Mécanisme de support pour un appareil électromagnétique |
| US20040085173A1 (en) * | 2002-11-01 | 2004-05-06 | Decristofaro Nicholas J. | Bulk amorphous metal inductive device |
| US20040085174A1 (en) * | 2002-11-01 | 2004-05-06 | Decristofaro Nicholas J. | Bulk laminated amorphous metal inductive device |
| 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 |
| EP2498266A2 (fr) * | 2011-03-08 | 2012-09-12 | Hitachi, Ltd. | Réacteur et transformateur électrique l'utilisant |
| EP2518740A1 (fr) * | 2009-12-25 | 2012-10-31 | Tamura Corporation | Réacteur et procédé pour le produire |
-
2013
- 2013-06-05 EP EP13170704.4A patent/EP2811495B1/fr not_active Not-in-force
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0283354A1 (fr) * | 1987-03-04 | 1988-09-21 | Sagem Allumage | Transformateur électrique, en particulier bobine d'allumage pour moteur à combustion interne |
| EP0913841A1 (fr) * | 1997-10-30 | 1999-05-06 | Ford Motor Company | Mécanisme de support pour un appareil électromagnétique |
| US20040085173A1 (en) * | 2002-11-01 | 2004-05-06 | Decristofaro Nicholas J. | Bulk amorphous metal inductive device |
| US20040085174A1 (en) * | 2002-11-01 | 2004-05-06 | Decristofaro Nicholas J. | Bulk laminated amorphous metal inductive device |
| EP2518740A1 (fr) * | 2009-12-25 | 2012-10-31 | Tamura Corporation | Réacteur et procédé pour le produire |
| EP2498266A2 (fr) * | 2011-03-08 | 2012-09-12 | Hitachi, Ltd. | Réacteur et transformateur électrique l'utilisant |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019014578A1 (fr) * | 2017-07-13 | 2019-01-17 | Diamond Electric Mfg. Corp. | Dispositifs électromagnétiques et leur gestion thermique |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2811495B1 (fr) | 2017-01-11 |
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