EP2751814A1 - Transformer and associated production method - Google Patents
Transformer and associated production methodInfo
- Publication number
- EP2751814A1 EP2751814A1 EP12751490.9A EP12751490A EP2751814A1 EP 2751814 A1 EP2751814 A1 EP 2751814A1 EP 12751490 A EP12751490 A EP 12751490A EP 2751814 A1 EP2751814 A1 EP 2751814A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- secondary winding
- conductor
- winding
- transformer according
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000004804 winding Methods 0.000 claims abstract description 126
- 239000004020 conductor Substances 0.000 claims abstract description 49
- 238000001816 cooling Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 5
- 239000000615 nonconductor Substances 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 4
- 238000009760 electrical discharge machining Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 239000002356 single layer Substances 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/346—Preventing or reducing leakage fields
-
- 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
- H01F41/02—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 for manufacturing cores, coils, or magnets
- H01F41/04—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 for manufacturing cores, coils, or magnets for manufacturing coils
-
- 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
Definitions
- the invention relates to a transformer and an associated manufacturing method.
- High-frequency transformers for high output currents are predominantly planar designs with stamped sheets for the secondary winding.
- the primary winding is usually also laminated or realized with stranded wire.
- Another problem is the implementation of the required isolation distances without an excessive increase of the leakage inductances. - -
- the invention has for its object to provide a transformer and an associated manufacturing method available that allow efficient cooling of the transformer with the least possible effort.
- the invention achieves this object by a transformer according to claim 1 and a manufacturing method according to claim 12.
- Preferred embodiments are the subject of the subclaims, the wording of which is hereby made part of the description.
- the transformer is preferably suitable or provided for clocked power supplies and comprises: a magnetic or magnetizable core, in particular a ferrite core, which defines a winding axis or has a winding axis, at least one primary winding, which is formed by a primary winding conductor, in particular in the form of multi-insulated high-frequency strand, which at least partially surrounds the winding axis of the core or a leg of the core through which the winding axis passes, and at least one secondary winding which is formed by a secondary winding conductor.
- a magnetic or magnetizable core in particular a ferrite core, which defines a winding axis or has a winding axis
- at least one primary winding which is formed by a primary winding conductor, in particular in the form of multi-insulated high-frequency strand, which at least partially surrounds the winding axis of the core or a leg of the core through which the winding axis passes
- secondary winding which is formed by
- the secondary winding conductor encloses the primary winding conductor, ie the secondary winding conductor and the primary winding conductor form different winding layers over the winding axis, the secondary winding is formed in one layer and a cross section of the secondary winding conductor is rectangular, in particular square. Due to the cross section and the consequent outer contour, the secondary winding can be coupled very easily and with low thermal resistance, for example to a cooling surface.
- the cross section of the particular massive winding or the solid conductor is deliberately oversized, so that an efficient heat flow within the winding is possible.
- the secondary winding conductor is massive, i. the complete cross-section of the conductor is filled with conductor material or the conductor is completely filled within its outer dimension with conductor material.
- the conductor is not constructed by interwoven strands, a plurality of combined individual conductors, as a waveguide or the like.
- the at least one secondary winding is formed from a solid block of material which is structured to form the secondary winding conductor, in particular by drilling, sawing and / or milling is structured.
- the at least one secondary winding is formed from a die-cast molding.
- the transformer has a rated power, wherein the (minimum) cross section of the secondary winding conductor is dimensioned such that a current carrying capacity of the secondary winding conductor is greater than required for the nominal power, i. the cross-section of the conductor is oversized relative to the rated power
- the secondary winding conductor made of copper or titanium, particularly preferably made of aluminum.
- a planar cooling element is provided, which is thermally coupled to the secondary winding, in particular to the side of the secondary winding facing away from the winding axis of the core.
- a heat-conducting electrical insulator is provided, which is arranged between the cooling element and the secondary winding.
- the electrical insulator is preferably an electrically insulating heat-conducting foil.
- the secondary winding or the secondary winding conductor forms a thermal bridge to the planar cooling element.
- Losses and losses of the primary winding (s) go first on the secondary winding (s), in order then to be dissipated, for example, over the flat cooling element in the form of a water-cooled cooling plate can.
- the secondary winding forms a heat sink.
- a distance between the primary winding and the core and a distance between the secondary winding and the primary winding are selected such that leakage losses are minimized.
- the primary winding is as close as possible above the core and the secondary winding is as close as possible to the primary winding, so that there are minimal loss components due to stray fields and a good thermal coupling of the system.
- the secondary winding is formed from a solid block of material which is patterned to form the conductor, in particular by material-removing machining in the form of drilling, sawing and / or milling.
- FIG. 1 is an illustration of a transformer according to the invention
- Fig. 2 is an exploded view of the transformer shown in Fig. 1 and
- FIG. 3 is an electrical equivalent circuit diagram of that shown in FIGS. 1 and 2
- a switched-mode power supply transformer 1 having a magnetizable ferrite core 2 with a leg defining a winding axis 3, a first primary winding 4a (see FIG. 2) formed by a first primary winding conductor of multi-insulated high-frequency stranded wire.
- a second primary winding 4b formed by a second primary winding conductor of multi-insulated high-frequency strand immediately surrounding the winding axis 3 of the core 2, the first primary winding 4a and the second primary winding 4b being axially adjacent the leg are arranged, a first solid secondary winding 5a made of aluminum, which is formed by a first secondary winding conductor 6a, and a second solid secondary winding 5b made of aluminum, which is formed by a second secondary winding conductor 6b
- bores 9a and 9b are provided as terminals for the first and second secondary winding 5a and 5b, respectively.
- Isolation elements 10 serve for electrically insulating between the primary and secondary circuits.
- the secondary winding conductors 6a and 6b enclose their associated primary winding conductor so as to be axially adjacent to the leg.
- the secondary winding conductors 6a and 6b are each formed in one layer and each have a rectangular cross-section in the winding direction, which is variable in the winding direction.
- the transformer has a specific rated power, wherein the cross section of the secondary winding conductors 6a and 6b is dimensioned such that their current carrying capacity is greater than required for the nominal power.
- a flat cooling element 7 is further provided, which is thermally coupled to the side facing away from the winding axis 3 of the core 2 side or surface of the secondary windings 5a and 5b, wherein between the cooling element 7 and the secondary windings 5a and 5b, a heat-conducting electrical Insulator in the form of an electrically insulating heat conducting foil 8 is provided.
- Corresponding cooling elements may be provided on the upper side and / or the lower side of the secondary windings 5a and 5b.
- the secondary windings 5a and 5b are each formed from a solid aluminum block of material, which is suitably structured by drilling, sawing, spark erosion and / or milling.
- the cross-section of the secondary winding conductors 6a and 6b or their minimal cross-section over the entire winding is dimensioned such that at a given operating frequency effective by current displacement replacement surface (skin depth) is significantly smaller than the geometric cross-section of the massive secondary winding conductors 6a and 6b.
- skin depth current displacement replacement surface
- Fig. 2 shows for clarity an exploded view of the transformer shown in Fig. 1.
- Fig. 3 shows an equivalent electrical circuit diagram of the transformer 1 shown in Figs. 1 and 2 with the primary windings 4a and 4b and the secondary windings 5a and 5b.
- the embodiments shown have massive secondary-side windings 5a and 5b, which are directly above the primary windings 4a - - or 4b are made of multi-insulated high-frequency stranded wire.
- the primary windings 4a and 4b are arranged at a minimum distance above the ferrite core 2.
- the (minimum) cross section of the massive secondary windings 5a and 5b is deliberately oversized, so as to achieve an efficient heat flow within the secondary windings 5a and 5b.
- the insulation of the windings 5a and 5b against the cooling surface 7 takes place with a thin heat-conducting foil 8 or ceramic material.
- the embodiments shown allow a simple cooling of the transformer 1 via the thermally well connectable massive secondary windings 5a and 5b.
- the transformer core 2 can also be easily thermally coupled, so that optimal cooling of the entire component is possible. Furthermore, due to the large cross section of the secondary windings 5a and 5b aluminum can be used, which saves weight and costs.
- the transformer 1 for clocked power supplies has at least one massive (secondary) winding whose cross-section is chosen such that a transport of heat generated during operation loss is possible to a flat heat sink without additional coolant is required. - -
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011082046A DE102011082046A1 (en) | 2011-09-02 | 2011-09-02 | Transformer and related manufacturing process |
PCT/EP2012/066207 WO2013030031A1 (en) | 2011-09-02 | 2012-08-20 | Transformer and associated production method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2751814A1 true EP2751814A1 (en) | 2014-07-09 |
EP2751814B1 EP2751814B1 (en) | 2018-04-18 |
Family
ID=46754976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12751490.9A Active EP2751814B1 (en) | 2011-09-02 | 2012-08-20 | Transformer and method of manufacturing thereof |
Country Status (5)
Country | Link |
---|---|
US (1) | US10734151B2 (en) |
EP (1) | EP2751814B1 (en) |
CN (2) | CN104054145A (en) |
DE (1) | DE102011082046A1 (en) |
WO (1) | WO2013030031A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3815118B1 (en) * | 2018-06-29 | 2023-08-16 | Sew-Eurodrive GmbH & Co. KG | Ring core transformer and system for supplying electrical power to a load |
CN110660563A (en) * | 2019-10-12 | 2020-01-07 | 台达电子企业管理(上海)有限公司 | Magnetic assembly and power module |
AT523579A1 (en) * | 2020-03-05 | 2021-09-15 | Avl List Gmbh | Magnetic choke, choke arrangement and converter with choke arrangement |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1420290A (en) * | 1973-06-14 | 1976-01-07 | Siemens Ag | Inductive electri'al components |
Family Cites Families (31)
Publication number | Priority date | Publication date | Assignee | Title |
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DE6907606U (en) * | 1969-02-26 | 1969-11-13 | Sel Kontakt Bauelemente G M B | REEL BODY |
NL178373C (en) | 1977-06-06 | 1986-03-03 | Philips Nv | TRANSFORMER. |
DE3718383A1 (en) | 1987-06-02 | 1988-12-15 | Vacuumschmelze Gmbh | HIGH FREQUENCY POWER TRANSMITTER |
US5175525A (en) | 1991-06-11 | 1992-12-29 | Astec International, Ltd. | Low profile transformer |
US5210513A (en) * | 1992-03-20 | 1993-05-11 | General Motors Corporation | Cooling of electromagnetic apparatus |
JPH08130127A (en) * | 1994-06-15 | 1996-05-21 | Nippondenso Co Ltd | High voltage transformer and discharge lamp circuit |
CN2226335Y (en) * | 1995-01-12 | 1996-05-01 | 冯涌波 | High-frequency transformer for low-temp rise contravariant power supply |
JPH1012454A (en) * | 1996-06-21 | 1998-01-16 | Toko Inc | Winding structure of transformer |
US6087916A (en) * | 1996-07-30 | 2000-07-11 | Soft Switching Technologies, Inc. | Cooling of coaxial winding transformers in high power applications |
DE19723958C2 (en) * | 1997-06-06 | 2000-08-24 | Siemens Ag | Tension bandage |
US6909349B1 (en) * | 1999-11-17 | 2005-06-21 | Trexco, Llc | Apparatus and method for cooling power transformers |
DE19959732A1 (en) * | 1999-12-10 | 2001-06-13 | Chris W Chrystowski | Inductive device has conductors stacked in helical strip essentially perpendicular to cylindrical surface axis, wound around core to form annular or tubular winding body |
CN2410721Y (en) * | 2000-01-03 | 2000-12-13 | 福生工业股份有限公司 | Power transformer radiator |
US6344786B1 (en) * | 2000-10-06 | 2002-02-05 | Artesyn Technologies, Inc. | Telescoping bobbin |
US6392519B1 (en) * | 2000-11-03 | 2002-05-21 | Delphi Technologies, Inc. | Magnetic core mounting system |
DE10127556A1 (en) * | 2001-06-06 | 2002-12-12 | Nexans France S A | Metallic wire |
DE10203246B4 (en) * | 2002-01-21 | 2004-01-29 | Bombardier Transportation Gmbh | Medium-frequency transformer |
JP4482765B2 (en) * | 2005-09-30 | 2010-06-16 | Tdk株式会社 | Switching power supply |
US8164406B2 (en) * | 2006-05-26 | 2012-04-24 | Delta Electronics, Inc. | Transformer |
JP4222490B2 (en) * | 2006-09-29 | 2009-02-12 | Tdk株式会社 | Planar transformer and switching power supply |
US7920039B2 (en) * | 2007-09-25 | 2011-04-05 | Flextronics Ap, Llc | Thermally enhanced magnetic transformer |
US7733208B2 (en) * | 2008-04-21 | 2010-06-08 | Wolfgram Industries, Inc. | High voltage pulse type transformer with increased coupling coefficient through primary and secondary winding proximity |
TWI324351B (en) * | 2008-06-13 | 2010-05-01 | Delta Electronics Inc | Transformer structure and rectifier circuit using the same |
CN201369232Y (en) * | 2008-11-12 | 2009-12-23 | 汤文生 | Planar transformer |
US20120086536A1 (en) * | 2009-01-28 | 2012-04-12 | Michael John Harrison | High Frequency Power Transformer and Method of Forming |
TWI379329B (en) * | 2009-02-13 | 2012-12-11 | Delta Electronics Inc | Transformer structure |
US20110121930A1 (en) * | 2009-09-24 | 2011-05-26 | Ngk Insulators, Ltd. | Coil-buried type inductor and a method for manufacturing the same |
KR20120118456A (en) * | 2009-09-24 | 2012-10-26 | 파커-한니핀 코포레이션 | Embedded cooling of wound electrical components |
JP5041052B2 (en) * | 2009-11-25 | 2012-10-03 | ダイキン工業株式会社 | Cooling structure of reactor with magnet |
JPWO2011089941A1 (en) * | 2010-01-20 | 2013-05-23 | 住友電気工業株式会社 | Reactor |
JP5333521B2 (en) * | 2011-06-06 | 2013-11-06 | 株式会社豊田自動織機 | Magnetic core |
-
2011
- 2011-09-02 DE DE102011082046A patent/DE102011082046A1/en not_active Withdrawn
-
2012
- 2012-08-20 CN CN201280053809.XA patent/CN104054145A/en active Pending
- 2012-08-20 WO PCT/EP2012/066207 patent/WO2013030031A1/en active Application Filing
- 2012-08-20 US US14/342,517 patent/US10734151B2/en active Active
- 2012-08-20 EP EP12751490.9A patent/EP2751814B1/en active Active
- 2012-08-20 CN CN201811172431.0A patent/CN109346296A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1420290A (en) * | 1973-06-14 | 1976-01-07 | Siemens Ag | Inductive electri'al components |
Non-Patent Citations (1)
Title |
---|
See also references of WO2013030031A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20140300438A1 (en) | 2014-10-09 |
CN104054145A (en) | 2014-09-17 |
DE102011082046A1 (en) | 2013-03-07 |
WO2013030031A1 (en) | 2013-03-07 |
CN109346296A (en) | 2019-02-15 |
US10734151B2 (en) | 2020-08-04 |
EP2751814B1 (en) | 2018-04-18 |
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Inventor name: HAERTSCH, CHRISS Inventor name: BISIG, THOMAS Inventor name: ITTEN, ALEX Inventor name: CAVIN, PIERE Inventor name: GROSS-KAEUFLER, SILVIA Inventor name: SCHEKULIN, DIRK |
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