EP0335142A1 - Transformateur pour réseau de commutation - Google Patents

Transformateur pour réseau de commutation Download PDF

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Publication number
EP0335142A1
EP0335142A1 EP89104114A EP89104114A EP0335142A1 EP 0335142 A1 EP0335142 A1 EP 0335142A1 EP 89104114 A EP89104114 A EP 89104114A EP 89104114 A EP89104114 A EP 89104114A EP 0335142 A1 EP0335142 A1 EP 0335142A1
Authority
EP
European Patent Office
Prior art keywords
core
projecting
switching power
air gap
power 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.)
Withdrawn
Application number
EP89104114A
Other languages
German (de)
English (en)
Inventor
Anton Dipl.-Ing. Schmeller (Fh)
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.)
Vogt Electronic AG
Original Assignee
Vogt Electronic AG
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 Vogt Electronic AG filed Critical Vogt Electronic AG
Publication of EP0335142A1 publication Critical patent/EP0335142A1/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Withdrawn legal-status Critical Current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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • 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
    • H01F19/06—Broad-band transformers, e.g. suitable for handling frequencies well down into the audio range

Definitions

  • the invention relates to a switched-mode transformer for flyback converter operation, the magnetic circuit of which has at least one air gap to avoid the saturation of the magnetic core material, the core having a base part and core parts projecting at a distance from one another, and the windings are arranged on and on at least one coil former a protruding core part is postponed.
  • Switching power transformers of this type operate in the frequency range up to about 500 kHz and always require an air gap in the magnetic circuit so that the saturation of the magnetic core material is avoided.
  • the cores are designed in two parts, so that it is possible to be able to push the previously separately manufactured coils with one or more windings on a coil former onto the protruding core parts.
  • the magnetic circuit is then closed with the second core part.
  • double U, double E, EI, EC, ETD cores are known and similar core forms.
  • the required air gap between the dividing surfaces of the core pairs is achieved, for example by inserting suitable spacers or by shortening at least one protruding core part compared to the others.
  • the known switching power transformers have the disadvantage that the cores require complicated and therefore expensive processing.
  • the two parts of the core pairs have to be connected to one another by staples or by an adhesive process in a complex operation.
  • the invention has for its object to provide a switching power transformer of the type mentioned, which requires neither a complicated core processing nor means for assembling and holding together core parts.
  • the above object is achieved according to the invention in that the core parts protruding from the base part are substantially extended beyond the width of the winding in order to form an air gap located outside the windings between their free end sections.
  • the subclaims relate to preferred embodiments of the transformer according to claim 1.
  • a permanent magnet in each case in the air gap between adjacent end sections of the projecting core parts or, according to patent claim 3, with a core with an outer projecting core part located central protruding core part, a permanent magnet is arranged in front of the free end of the latter.
  • the pre-magnetization of the core enables a higher power to be implemented in flyback converter operation.
  • the premagnetization according to claim 3 with a permanent magnet arranged on the end face in front of the free end of a central protruding core part has the further advantage that the permanent magnet is not demagnetized in the event of a short circuit.
  • the surfaces of the free end sections opposite one another at an air gap are the front protruding core parts preferably carried out plane-parallel.
  • the measure according to claim 5 is advantageous in several respects. On the one hand, it has surprisingly been found that the external magnetic stray field is reduced by the beveling of the core legs. In addition, there is a weight saving on the core and thus less expensive production, and the core with the bevelled protruding core parts, e.g. Core legs, tolerates higher accelerations due to the lower mass (reduced risk of breakage).
  • the core is preferably designed as a U, E or bell core.
  • the protruding core parts outside the actual coil or coils are extended and dimensioned so that the magnetic resistance of their opposite end portions is approximately the same as the magnetic resistance of the air gap between them.
  • the core 1 is a U-core, which carries a coil 4 with the required windings on each of its two core parts 3 protruding from its base part 2, which here form legs, each of which is up close of the base part 2 are pushed onto it.
  • the protruding core parts 3 are substantially extended beyond the width of the respective coils 4 or windings, and their extended end sections 5 form between them the air gap 6, which is necessary in a switched-mode transformer to avoid saturation of the core material.
  • the magnetic circuit outside the coils 4 is closed via the air gap 6.
  • the magnetic field lines are shown in dashed lines and designated 7.
  • the embodiment according to FIG. 2 differs from that according to FIG. 1 in that the core here is an E-core, only one coil 4 with the necessary windings is provided, which is pushed onto the central protruding core part 3, and two air gaps 6 between the middle protruding core part 3 and the two outer protruding core divide 3 are present.
  • the embodiment according to FIG. 3 corresponds to that according to FIG. 2 with the difference that a permanent magnet 8 is arranged in each of the two air gaps 6.
  • the two permanent magnets 8 cause the magnetic material of the core 1 to be premagnetized.
  • the core 1 is a pot core.
  • the core parts 3 protruding from a disk-shaped base part 2 consist of a central cylindrical part and a cylindrical jacket which coaxially surrounds the latter at a distance.
  • the air gap 6 here extends radially between the free end section 5 of the central central projecting core part 3 and the free end section 5 of the jacket-shaped outer projecting core part 3.
  • FIG. 5 corresponds to that according to FIG. 1 and the embodiment according to FIG. 6 to that according to FIG. 2, each with the difference that here the free end sections 5 of the respective outer protruding core parts 3 on their sides remote from one another towards the free end face are chamfered inwards, the chamfer 9 beginning immediately after the coil arrangement.
  • the embodiment according to FIG. 7 differs from that according to FIG. 6 in that a permanent magnet 8 which pre-magnetizes the core 1 is arranged in front of the free end face of the central projecting core part 3.
  • the coil 4 here has two windings W1 and W2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Dc-Dc Converters (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP89104114A 1988-03-29 1989-03-08 Transformateur pour réseau de commutation Withdrawn EP0335142A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3810625A DE3810625A1 (de) 1988-03-29 1988-03-29 Schaltnetztrafo
DE3810625 1988-03-29

Publications (1)

Publication Number Publication Date
EP0335142A1 true EP0335142A1 (fr) 1989-10-04

Family

ID=6350956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104114A Withdrawn EP0335142A1 (fr) 1988-03-29 1989-03-08 Transformateur pour réseau de commutation

Country Status (5)

Country Link
US (1) US5103201A (fr)
EP (1) EP0335142A1 (fr)
JP (1) JPH01276710A (fr)
KR (1) KR890015306A (fr)
DE (1) DE3810625A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839771A1 (de) * 1988-11-25 1990-05-31 Vogt Electronic Ag Schaltnetztrafo mit nur einem kern
JP3318889B2 (ja) * 1997-11-28 2002-08-26 太陽誘電株式会社 可変リニアリティコイル
JP2002164217A (ja) * 2000-11-29 2002-06-07 Tokin Corp インダクタンス部品
US7898379B1 (en) * 2002-12-13 2011-03-01 Volterra Semiconductor Corporation Method for making magnetic components with N-phase coupling, and related inductor structures
US8299885B2 (en) 2002-12-13 2012-10-30 Volterra Semiconductor Corporation Method for making magnetic components with M-phase coupling, and related inductor structures
JP5243361B2 (ja) * 2009-07-15 2013-07-24 コーセル株式会社 スイッチング電源装置
US8975995B1 (en) 2012-08-29 2015-03-10 Volterra Semiconductor Corporation Coupled inductors with leakage plates, and associated systems and methods
US9691538B1 (en) 2012-08-30 2017-06-27 Volterra Semiconductor LLC Magnetic devices for power converters with light load enhancers
CN104795217B (zh) * 2015-05-08 2016-09-28 上海工程技术大学 一种微位移测试系统用电源高频变压器绕制方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1149916A (fr) * 1956-04-17 1958-01-03 Labinal Ets Perfectionnements apportés aux dispositifs comprenant au moins un bobinage associé à un circuit magnétique, notamment aux self-inductances
EP0034955A1 (fr) * 1980-02-20 1981-09-02 DUCELLIER & Cie Bobine d'allumage pour moteurs à combustion interne

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US349611A (en) * 1886-09-21 Signoe to geoege westing house
US3243692A (en) * 1966-03-29 Travelx-responsive s sensingx d device, particularly for control of fabricating machinery
US1367988A (en) * 1921-02-08 replogle
US889346A (en) * 1907-05-01 1908-06-02 Harold Thomassen Eye-magnet.
DE552546C (de) * 1930-08-12 1932-06-15 Fritz Hellmuth Dr Ing Regelbare Drosselspule, bestehend aus einem verschiebbar angeordneten U-foermigen Eisenkern und einer Stromspule, in die ein Schenkel des Eisenkerns taucht
US2555110A (en) * 1947-10-03 1951-05-29 Int Electronics Co Magnetic head assembly
US2585932A (en) * 1948-07-29 1952-02-19 Magnetic Equipment Inc Device for reducing noise in magnetic recording systems
US2587097A (en) * 1948-11-19 1952-02-26 Berlant Associates Magnetic transducer head and mount therefor
BE520381A (fr) * 1952-06-03
US2867785A (en) * 1953-03-06 1959-01-06 Ranza A Crumbliss Ignition coil
FR1159725A (fr) * 1956-08-22 1958-07-01 Marocaine D Electronique Somel Dispositif de lecture magnétique
US4104437A (en) * 1974-09-24 1978-08-01 Champion International Corporation Pressure-sensitive copy system including ureido fluoran chromogenic compounds
DE3614492A1 (de) * 1986-04-29 1987-11-05 Electronic Werke Deutschland Elektrischer wandler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1149916A (fr) * 1956-04-17 1958-01-03 Labinal Ets Perfectionnements apportés aux dispositifs comprenant au moins un bobinage associé à un circuit magnétique, notamment aux self-inductances
EP0034955A1 (fr) * 1980-02-20 1981-09-02 DUCELLIER & Cie Bobine d'allumage pour moteurs à combustion interne

Also Published As

Publication number Publication date
KR890015306A (ko) 1989-10-28
US5103201A (en) 1992-04-07
DE3810625A1 (de) 1989-10-19
JPH01276710A (ja) 1989-11-07

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