EP1884966A1 - Transformateur d'isolation - Google Patents

Transformateur d'isolation Download PDF

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Publication number
EP1884966A1
EP1884966A1 EP06425554A EP06425554A EP1884966A1 EP 1884966 A1 EP1884966 A1 EP 1884966A1 EP 06425554 A EP06425554 A EP 06425554A EP 06425554 A EP06425554 A EP 06425554A EP 1884966 A1 EP1884966 A1 EP 1884966A1
Authority
EP
European Patent Office
Prior art keywords
transformer
insulating
secondary winding
core
bobbin
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.)
Withdrawn
Application number
EP06425554A
Other languages
German (de)
English (en)
Inventor
Luca Bordin
Marco Faccin
Mirco Frasson
Raffaele Piva
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.)
Osram GmbH
Osram SpA
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Osram SpA
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH, Osram SpA filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to EP06425554A priority Critical patent/EP1884966A1/fr
Publication of EP1884966A1 publication Critical patent/EP1884966A1/fr
Withdrawn legal-status Critical Current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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2895—Windings disposed upon ring cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal transformers
    • 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
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H01F2019/085—Transformer for galvanic isolation
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/326—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures specifically adapted for discharge lamp ballasts

Definitions

  • the invention relates to insulating transformers and was developed with specific attention paid to its possible use in electronic drive units for halogen lamps.
  • Insulating transformers for use in driving halogen lamps currently employ two different types of ferrite cores, namely "toroidal" cores or "E-shaped” cores.
  • a basic drawback of toroidal cores lies in their low leakage inductance. This leads to more complicated drive and protection circuitry and to the need of using higher-rated power transistors.
  • Transformers including "E-shaped" cores, or cores having more complex geometries, typically exhibit sufficiently high values of leakage inductance. They must however be provided with a plastic bobbin to ensure proper insulation (e.g. in conformity with IEC 61347-2-2) and their construction is inevitably more complicated.
  • the object of the invention is to provide such an insulating transformer.
  • reference 10 designates as a whole an insulating transformer for use e.g. in electronic drivers for halogen lamps.
  • the transformer 10 is essentially comprised of a ferrite toroidal core 12 having wound thereon (as better detailed in the following) a primary winding 14 and a secondary winding 16.
  • the ends of the wires comprising the primary winding 14 and the secondary winding 16 are designated 1,2 and 3, 4, respectively.
  • ferrite core 12 having a closed toroidal shape is presently preferred, use of a ferromagnetic material different from ferrite and/or toroidal cores that are not completely closed (e.g. with a "split- ring" geometry) falls within the scope of the invention.
  • the exemplary arrangement described herein is a step-down transformer arrangement, wherein the primary winding 14 includes a number of turns that is (much) higher than the number of turns in the secondary winding 16.
  • the primary winding 14 is comprised of an enamelled wire of smaller gauge than the sheathed wire comprising the secondary winding 16.
  • a feature of the arrangement described herein lies in that the windings 14 and 16 are wound on the core 12 in such a way that they are not angularly superposed, in that they are wound on distinct circular sectors (i.e. "slices") of the core 12.
  • the primary winding 14 is not wound over the entire toroidal surface of the core 12, but only over a sector having an angular width of e.g. typically less than 90 degrees.
  • the secondary winding 16 is wound on another angular sector of the toroidal core 12 extending over an angular width again of less than 90 degrees and not overlapping with the primary winding 14.
  • the two windings 14 and 16 are wound over angular sectors of the core at locations that are approximately diametrically opposed across the core 12.
  • the primary inductance is always normally about 100 times bigger than its leakage inductance and more than 1000 times bigger than that obtained without a ferrite core (it means to wound the wires direct in the air). This means that almost all the primary flux lines are "driven” inside the ferrite core concatenating the secondary winding and creating the desired coupling effect between primary and secondary windings.
  • the insulating properties of the transformer 10 is achieved by using for the secondary winding 16 an insulating wire, such as an sheathed wire with a sheath of at least 0.4 millimetres complying with IEC 61347-2-2.
  • Such a "bobbin-less" arrangement represents at the moment a preferred embodiment.
  • the invention lends itself to be practiced by resorting to an alternative embodiment wherein the primary winding 14 is wound on the core 12 and an insulating plastics bobbin (e.g. PET class F or equivalent) is then applied - in a manner known per se - over the assembly thus formed.
  • the secondary winding 16 (comprised in this case of a simple enamelled wire which is normally considered not having any isolation from the safety requirements point of view) is then wound over the insulating bobbin. This while preserving the non-overlapping arrangement of the windings 1 and 16, that is by ensuring that the two windings 14 and 16 are wound over distinct sectors of the core 12, preferably diametrically opposed to each other to maximize the leakage inductance.
  • the transformer described herein can be used in connection with arrangements integrating thermal and overload protections as described e.g. in EP-A-0 800 334 .
  • the transformer described herein can be used with lower-rated power transistors (for instance Dpack transistors with output power of the electronic transformer up to 100W, in the place of e.g. TO-220 or D 2 pack or SOT-82).
  • lower-rated power transistors for instance Dpack transistors with output power of the electronic transformer up to 100W, in the place of e.g. TO-220 or D 2 pack or SOT-82).
  • the non-overlapping features of the windings 14 and 16 enables i.a. locating the secondary winding 16 with a good degree of freedom in fulfilling the requirements of EN55015 without affecting the value of the leakage inductance while having the opportunity of using a cheaper input filter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP06425554A 2006-08-01 2006-08-01 Transformateur d'isolation Withdrawn EP1884966A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06425554A EP1884966A1 (fr) 2006-08-01 2006-08-01 Transformateur d'isolation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425554A EP1884966A1 (fr) 2006-08-01 2006-08-01 Transformateur d'isolation

Publications (1)

Publication Number Publication Date
EP1884966A1 true EP1884966A1 (fr) 2008-02-06

Family

ID=37563214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425554A Withdrawn EP1884966A1 (fr) 2006-08-01 2006-08-01 Transformateur d'isolation

Country Status (1)

Country Link
EP (1) EP1884966A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011026706A1 (fr) * 2009-09-04 2011-03-10 Osram Gesellschaft mit beschränkter Haftung Transformateur électronique
EP2529600A1 (fr) * 2010-01-26 2012-12-05 Gradix Holding Ltd. Conversion de tension alternative et dispositif de commutation
CN107808751A (zh) * 2017-11-17 2018-03-16 宁波中策亿特电子有限公司 一种防高压高频变压器
CN108922738A (zh) * 2018-07-02 2018-11-30 张家港鑫峰机电有限公司 一种电感及其绕制工艺
US10971299B2 (en) * 2017-11-21 2021-04-06 Cisco Technology, Inc. Biorthogonal windings on transformer and common mode choke for network port

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3613861A1 (de) * 1986-04-24 1987-11-05 Nkl Naturenergie Und Kleinspan Geraeuschgedaempftes induktives elektrisches bauelement
EP0558428A1 (fr) * 1992-02-24 1993-09-01 Schneider Electric Sa Transformateur en forme de tore pour capteur différentiel fonctionnant en classe A.
US5377652A (en) * 1993-11-08 1995-01-03 Chrysler Corporation Ignition transformer
WO1999017016A2 (fr) * 1997-09-18 1999-04-08 Alliedsignal Inc. Systeme d'allumage a haute vitesse d'impulsions
EP0974985A1 (fr) * 1998-07-23 2000-01-26 Bayerische Motoren Werke Aktiengesellschaft Bobine d'allumage
DE20013624U1 (de) * 2000-08-08 2001-12-20 Tridonic Bauelemente Gmbh, Dornbirn Elektronischer Transformator für Niedervolt-Halogenlampen
US20030210123A1 (en) * 2002-05-07 2003-11-13 Defond Manufacturing Limited Toroidal core for a toroid

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3613861A1 (de) * 1986-04-24 1987-11-05 Nkl Naturenergie Und Kleinspan Geraeuschgedaempftes induktives elektrisches bauelement
EP0558428A1 (fr) * 1992-02-24 1993-09-01 Schneider Electric Sa Transformateur en forme de tore pour capteur différentiel fonctionnant en classe A.
US5377652A (en) * 1993-11-08 1995-01-03 Chrysler Corporation Ignition transformer
WO1999017016A2 (fr) * 1997-09-18 1999-04-08 Alliedsignal Inc. Systeme d'allumage a haute vitesse d'impulsions
EP0974985A1 (fr) * 1998-07-23 2000-01-26 Bayerische Motoren Werke Aktiengesellschaft Bobine d'allumage
DE20013624U1 (de) * 2000-08-08 2001-12-20 Tridonic Bauelemente Gmbh, Dornbirn Elektronischer Transformator für Niedervolt-Halogenlampen
US20030210123A1 (en) * 2002-05-07 2003-11-13 Defond Manufacturing Limited Toroidal core for a toroid

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011026706A1 (fr) * 2009-09-04 2011-03-10 Osram Gesellschaft mit beschränkter Haftung Transformateur électronique
EP2529600A1 (fr) * 2010-01-26 2012-12-05 Gradix Holding Ltd. Conversion de tension alternative et dispositif de commutation
CN107808751A (zh) * 2017-11-17 2018-03-16 宁波中策亿特电子有限公司 一种防高压高频变压器
CN107808751B (zh) * 2017-11-17 2020-07-07 宁波中策亿特电子有限公司 一种防高压高频变压器
US10971299B2 (en) * 2017-11-21 2021-04-06 Cisco Technology, Inc. Biorthogonal windings on transformer and common mode choke for network port
US11948728B2 (en) 2017-11-21 2024-04-02 Cisco Technology, Inc. Biorthogonal windings on transformer and common mode choke for network port
CN108922738A (zh) * 2018-07-02 2018-11-30 张家港鑫峰机电有限公司 一种电感及其绕制工艺
CN108922738B (zh) * 2018-07-02 2020-01-17 张家港鑫峰机电有限公司 一种电感及其绕制工艺

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