EP0602528A1 - Transformateur - Google Patents

Transformateur Download PDF

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Publication number
EP0602528A1
EP0602528A1 EP93119794A EP93119794A EP0602528A1 EP 0602528 A1 EP0602528 A1 EP 0602528A1 EP 93119794 A EP93119794 A EP 93119794A EP 93119794 A EP93119794 A EP 93119794A EP 0602528 A1 EP0602528 A1 EP 0602528A1
Authority
EP
European Patent Office
Prior art keywords
transformer
core
partial windings
windings
turns
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Withdrawn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
EP93119794A
Other languages
German (de)
English (en)
Inventor
Andreas Huber
Franz Bernitz
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
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0602528A1 publication Critical patent/EP0602528A1/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Withdrawn legal-status Critical Current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
    • H01F27/2823—Wires
    • 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
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core

Definitions

  • the invention relates to a transformer for forward and choke converters, in particular for supplying discharge lamps and low-voltage halogen lamps, according to the preamble of claim 1.
  • Transformers in various designs are known from the prior art.
  • at least one primary winding and one secondary winding wind around a core which is made of magnetizable material and has a ring shape, rod shape or other possible shapes.
  • the primary and secondary windings are usually layered on top of each other.
  • DE-OS 40 01 840 A1 proposes a transformer which has a primary winding and at least two secondary windings, and a transformer core with a central leg carrying the primary windings and two side legs.
  • the secondary windings are on the side legs and the middle leg.
  • the primary and secondary windings are stacked on top of each other on the middle leg.
  • Field distortions for example caused by an air gap in the transformer core or inhomogeneities in the core material, can produce a large difference in the magnetic flux in the partial windings due to the stacking of the primary and secondary windings, since the field distortions result in different magnetic fields at different distances from the core. As a result, the coupling between the partial windings is reduced, which in turn leads to poorer efficiency. This has a very negative effect, especially when using such transformers in forward and choke converters.
  • the invention has for its object to provide a transformer of the type mentioned, which has an improved coupling between the windings of the transformer.
  • the core carrying the winding is designed as a closed ring core.
  • a metal powder core offers the advantage of a highly controllable transformer.
  • a ferrite core offers good high-frequency properties of the transformer.
  • the arrangement of an air gap reduces the initial permeability ⁇ i to the effective permeability ⁇ e .
  • the component has a high strength and is easier to handle, which has a particularly favorable effect on soldering onto a circuit board .
  • the transformer can be used as an energy store and transformer in forward converters, e.g. Push-pull flow converter as well as in throttle converters, e.g. Use electrically isolated fly-back converters or tapped high actuators.
  • forward converters e.g. Push-pull flow converter
  • throttle converters e.g. Use electrically isolated fly-back converters or tapped high actuators.
  • Figure 1 shows a transformer 10 in which the core 12 is designed as a ring core.
  • a primary winding 14 and a secondary winding 16 are wound around the core 12, the secondary winding 16 having twice as many turns as the primary winding 14.
  • the winding is carried out in one layer, so that two secondary winding wires lie directly and immediately adjacent to the primary winding wire. Due to this close localization of the winding wires, corresponding primary or secondary winding segments are always exposed to almost exactly the same magnetic flux.
  • the winding wires experience almost exactly the same changed magnetic flux.
  • Such disturbances are caused, for example, by the sawn-in air gap in the ferrite core or by inhomogeneities in the core material itself. Because the partial windings are always surrounded by the same magnetic flux at corresponding points, even if this flux varies somewhat locally, there is a high coupling between primary winding 14 and secondary winding 16. This results in an improved efficiency of the transformer.
  • FIG. 2 shows a transformer 10 with a toroidal core 12 on which partial windings 18 are arranged.
  • the wound toroidal core 12 is fastened to a base plate 20 by means of adhesive 32.
  • the base plate 20 is provided with solder pins 22.
  • Corresponding winding ends 24 of the partial windings 18 are provided with corresponding solder pins 22. This resulting component can be e.g. insert into a circuit board using the soldering pins 22 and then solder firmly onto the circuit board.
  • FIGS. 3 and 4 show in circuit diagram form the use of the transformer once in a floating fly-back converter 26 (FIG. 3) and in a tapped up positioner 28 (FIG. 4).
  • the circuits in FIGS. 3 and 4 are used to supply discharge lamps and low-voltage halogen lamps.
  • the memory inductors 30 are constructed from a plurality of windings, as set out in the embodiment according to FIGS. 1 and 2.
  • the degree of freedom resulting from the multi-winding structure can be used in these application examples for a more favorable adaptation of the power components, e.g. via only one tap as winding transformer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)
EP93119794A 1992-12-15 1993-12-08 Transformateur Withdrawn EP0602528A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924242295 DE4242295A1 (de) 1992-12-15 1992-12-15 Transformator
DE4242295 1992-12-15

Publications (1)

Publication Number Publication Date
EP0602528A1 true EP0602528A1 (fr) 1994-06-22

Family

ID=6475330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119794A Withdrawn EP0602528A1 (fr) 1992-12-15 1993-12-08 Transformateur

Country Status (2)

Country Link
EP (1) EP0602528A1 (fr)
DE (1) DE4242295A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19960881A1 (de) * 1999-12-17 2001-06-21 Abb Research Ltd Transformator
DE102006013692A1 (de) * 2006-03-24 2007-10-04 Handlbauer, Gerhard Infrarot-dimmbarer Niedervolt-(Halogen)trafo

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB918978A (en) * 1958-09-23 1963-02-20 Racal Electronics Ltd Improvements in electrical transformers
DE8809164U1 (de) * 1988-07-13 1989-05-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Streuinduktivitätsarmer Mittelfrequenz-Transformator
WO1992004723A1 (fr) * 1990-09-07 1992-03-19 Electrotech Instruments Limited Transfomateurs de puissance et inducteurs couples avec entrelacement optimal d'enroulement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB918978A (en) * 1958-09-23 1963-02-20 Racal Electronics Ltd Improvements in electrical transformers
DE8809164U1 (de) * 1988-07-13 1989-05-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Streuinduktivitätsarmer Mittelfrequenz-Transformator
WO1992004723A1 (fr) * 1990-09-07 1992-03-19 Electrotech Instruments Limited Transfomateurs de puissance et inducteurs couples avec entrelacement optimal d'enroulement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NASA TECH BRIEFS: "coaxial cable on toroid yields wide-band transformer", ELECTRONIC DESIGN, vol. 15, no. 13, 21 June 1967 (1967-06-21), pages 108 *

Also Published As

Publication number Publication date
DE4242295A1 (de) 1994-06-16

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Effective date: 19941223