EP0225241B1 - Coreless-type high-frequency current transformer - Google Patents

Coreless-type high-frequency current transformer Download PDF

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Publication number
EP0225241B1
EP0225241B1 EP86402512A EP86402512A EP0225241B1 EP 0225241 B1 EP0225241 B1 EP 0225241B1 EP 86402512 A EP86402512 A EP 86402512A EP 86402512 A EP86402512 A EP 86402512A EP 0225241 B1 EP0225241 B1 EP 0225241B1
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EP
European Patent Office
Prior art keywords
central part
spool
transformer
wound
parts
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.)
Expired - Lifetime
Application number
EP86402512A
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German (de)
French (fr)
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EP0225241A1 (en
Inventor
Noel Guais
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General Electric CGR SA
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General Electric CGR SA
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01F27/027—Casings specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
    • 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
    • H01F27/2866—Combination of wires and sheets
    • 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

Definitions

  • the present invention relates to a high frequency air current transformer.
  • transformers devoid of magnetic cores for medical magnetic resonance imaging devices generally known by the abbreviation MRI.
  • MRI magnetic resonance imaging devices
  • the known production techniques for current transformers lead to the use of magnetic ferrite circuits to obtain good magnetic coupling between the primary and secondary windings of the transformers.
  • These production techniques naturally go against the design requirements of MRI devices because the presence of a ferrite intensity transformer can naturally cause deformation of the field lines of the magnet of MRI devices.
  • Such a transformer revealed for example by document US-A-4 176 335, cannot be suitable because it has a ferrite core and because its conductive strands are distributed in a way which in itself would deform the lines of the field of this magnet.
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the subject of the invention is a high frequency intensity transformer with air, comprising on the one hand, a primary winding formed by a conductive strip wound on an insulating mandrel, and on the other hand, a secondary winding with N contiguous turns of enameled wire wound above the conductive strip, characterized in that that the primary winding comprises a rectangular central part whose long sides extend over a turn around the mandrel in a first direction, and two parts located at the ends, measured in this first direction, of the central part, also shaped roughly rectangular, the long sides of these two parts each extending in one of a second and a third direction, in opposite directions to each other and both substantially perpendicular to the first direction, these two parts being collinear when the central part is wound on the mandrel, and in that the ends of the central part are truncated to avoid er the overlapping of the ends of this central part when this central part is wound on the mandrel.
  • the main advantage of the invention is that it allows the production of high frequency air intensity transformers, in which maximum coupling can be obtained between the primary and secondary windings, which thus partially compensates for the absence of magnetic circuit. .
  • the particular shape of the conductive strip which avoids the overlapping of the ends of the coil, makes it possible to obtain maximum efficiency of the latter over a full turn, while dispensing with the establishment of layers of insulation between ends which would disadvantage the quality of the magnetic coupling between primary and secondary
  • the shape given to the primary turn guarantees a winding of constant thickness of the primary and secondary windings around the mandrel and thus allows the best coupling to be obtained.
  • the current transformer according to the invention which is shown in Figure 1 comprises a mandrel 1 made of plastic, or any other equivalent insulating material, on which are successively wound, a primary winding 2, a metal screen 3 and a secondary winding 4.
  • the primary winding 2 is constituted by a strip which is cut from a sheet of metal foil according to the S-shaped outline shown in FIG. 2, before being wound on the mandrel 1.
  • the strip shown in FIG. 2 includes a central part 5 of roughly rectangular shape and two other parts 6 and 7 of also roughly rectangular shapes which extend in two directions opposite to each other at the ends of the central part. In FIG. 2, directions of the long sides 61, 62 on the one hand, and 71, 72 on the other hand, rectangular parts 6 and 7 are perpendicular to the direction of the long sides 51 and 52 of the rectangle forming the central part 5.
  • the length L of the long sides 51, 52 of the central part is determined to allow the ends 6 and 7 to be in extension of one another when the central part 5 is wound on the mandrel 1 and the angles formed by the adjacent edges of the corresponding lamella on the one hand, at the sides 52, 62 and on the other hand, at the sides 51, 71 are truncated in the same direction, at 45 ° for example from the direction of the sides 51 and 52, for form the edges 8 and 9 of FIG. 2, and avoid overlapping the ends of the central part 5 when it is wound on the mandrel 1 in the manner shown in FIG. 3.
  • the screen 3 which is represented in FIG. 4 makes it possible to carry out the electrostatic shielding of the transformer and to limit the stray capacitances between primary and secondary.
  • the isolations between the screen 3 and the primary and secondary windings are carried out in a known manner using one or more layers of PTFE sheets (abbreviation of polytetrafluoroethylene) or of adhesive paper.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)

Description

La présente invention concerne un transformateur d'intensite haute fréquence à air.The present invention relates to a high frequency air current transformer.

Elle s'applique plus particulièrement à la fabrication de transformateurs dépourvus de noyaux magnétiques pour les appareils médicaux d'imagerie par résonance magnétique généralement connus sous l'abréviation IRM. On sait qu'il est souhaitable pour obtenir un bon fonctionnement de ces appareils de supprimer les causes de déformations des lignes de champ de l'aimant entrant dans la constitution de ces appareils. Or aux fréquences de fonctionnement de ceux-ci, 6 à 30 MHz, les techniques de réalisation connues des transformateurs d'intensité conduisent à utiliser des circuits magnétiques en ferrite pour obtenir un bon couplage magnétique entre enroulements primaire et secondaire des transformateurs. Ces techniques de réalisation vont naturellement à l'encontre des exigences de conception des appareils IRM car la présence d'un transformateur d'intensité en ferrite peut naturellement provoquer des déformations des lignes des champs de l'aimant des appareils IRM. Un tel transformateur, révélé par exemple par le document US-A-4 176 335, ne peut pas convenir car il possède un noyau ferrite et parce que ses brins conducteurs sont répartis d'une manière qui en elle même déformerait les lignes du champ de cet aimant.It more particularly applies to the manufacture of transformers devoid of magnetic cores for medical magnetic resonance imaging devices generally known by the abbreviation MRI. We know that it is desirable to obtain proper operation of these devices to eliminate the causes of deformation of the field lines of the magnet used in the construction of these devices. However, at their operating frequencies, 6 to 30 MHz, the known production techniques for current transformers lead to the use of magnetic ferrite circuits to obtain good magnetic coupling between the primary and secondary windings of the transformers. These production techniques naturally go against the design requirements of MRI devices because the presence of a ferrite intensity transformer can naturally cause deformation of the field lines of the magnet of MRI devices. Such a transformer, revealed for example by document US-A-4 176 335, cannot be suitable because it has a ferrite core and because its conductive strands are distributed in a way which in itself would deform the lines of the field of this magnet.

Le but de l'invention est de pallier les inconvénients précités.The object of the invention is to overcome the aforementioned drawbacks.

A cet effet, l'invention a pour objet, un transformateur d'intensité haute fréquence à air, comportant d'une part, un enroulement primaire formé par une lamelle conductrice enroulée sur un mandrin isolant , et d'autre part, un enroulement secondaire à N spires jointives de fil émaillé enroulées au-dessus de la lamelle conductrice, caractérisé en ce que l'enroulement primaire comporte une partie centrale rectangulaire dont les grands côtés s'étendent sur un tour autour du mandrin selon une première direction, et deux parties situées aux extrémités, mesurées selon cette première direction, de la partie centrale, de forme elles aussi à peu près rectangulaire, les grands côtés de ces deux parties s'étendant chacune selon une seule d'une deuxième et d'une troisième direction, de sens opposés l'une à l'autre et toutes deux sensiblement perpendiculairement à la première direction, ces deux parties étant colinéaires lorsque la partie centrale est enroulée sur le mandrin , et en ce que les extrémités de la partie centrale sont tronqués pour éviter le chevauchement des extrémités de cette partie centrale lorsque cette partie centrale est enroulée sur le mandrin.To this end, the subject of the invention is a high frequency intensity transformer with air, comprising on the one hand, a primary winding formed by a conductive strip wound on an insulating mandrel, and on the other hand, a secondary winding with N contiguous turns of enameled wire wound above the conductive strip, characterized in that that the primary winding comprises a rectangular central part whose long sides extend over a turn around the mandrel in a first direction, and two parts located at the ends, measured in this first direction, of the central part, also shaped roughly rectangular, the long sides of these two parts each extending in one of a second and a third direction, in opposite directions to each other and both substantially perpendicular to the first direction, these two parts being collinear when the central part is wound on the mandrel, and in that the ends of the central part are truncated to avoid er the overlapping of the ends of this central part when this central part is wound on the mandrel.

L'invention a principalement pour avantage qu'elle permet la réalisation de transformateurs d'intensité haute fréquence à air, dans lesquels un couplage maximal peut être obtenu entre les enroulements primaire et secondaire, ce qui compense ainsi en partie l'absence de circuit magnétique.The main advantage of the invention is that it allows the production of high frequency air intensity transformers, in which maximum coupling can be obtained between the primary and secondary windings, which thus partially compensates for the absence of magnetic circuit. .

D'autre part, la forme particulière de la lamelle conductrice qui évite le chevauchement des extrémités de la spire, permet d'obtenir une efficacité maximale de celle-ci sur un tour complet, tout en dispensant de la mise en place de couches d'isolements entre extrémités qui défavoriseraient la qualité du couplage magnétique entre primaire et secondaire.On the other hand, the particular shape of the conductive strip which avoids the overlapping of the ends of the coil, makes it possible to obtain maximum efficiency of the latter over a full turn, while dispensing with the establishment of layers of insulation between ends which would disadvantage the quality of the magnetic coupling between primary and secondary

Egalement, la forme donnée à la spire primaire garantit un bobinage d'épaisseur constante des enroulements primaire et secondaire autour du mandrin et permet ainsi l'obtention du meilleur couplage.Also, the shape given to the primary turn guarantees a winding of constant thickness of the primary and secondary windings around the mandrel and thus allows the best coupling to be obtained.

D'autres caractéristiques et avantages de l'invention apparaîtront également à l'aide de la description qui va suivre faite au regard des dessins annexés qui représentent :

  • la figure 1 une vue en perspective d'un transformateur d'intensité selon l'invention ;
  • la figure 2 un mode de réalisation vu en plan d'une lamelle conductrice pour l'obtention de l'enroulement primaire du transformateur selon l'invention ;
  • la figure 3 une représentation d'une lamelle conductrice montée sur un mandrin d'un transformateur selon l'invention ;
  • la figure 4 un mode de réalisation de l'écran d'isolement du transformateur représenté à la figure 1.
Other characteristics and advantages of the invention will also appear with the aid of the description which follows, given with regard to the appended drawings which represent:
  • Figure 1 a perspective view of an intensity transformer according to the invention;
  • Figure 2 an embodiment seen in plan of a conductive strip for obtaining the primary winding of the transformer according to the invention;
  • Figure 3 a representation of a conductive strip mounted on a mandrel of a transformer according to the invention;
  • FIG. 4 an embodiment of the isolation screen of the transformer shown in FIG. 1.

Le transformateur d'intensité selon l'invention qui est représenté à la figure 1 comprend un mandrin 1 en matière plastique, ou tout autre matériau isolant équivalent, sur lequel sont enroulés successivement, un enroulement primaire 2, un écran métallique 3 et un enroulement secondaire 4. L'enroulement primaire 2 est constitué par une lamelle qui est découpée dans une feuille de clinquant métallique selon le tracé en forme de S représenté à la figure 2, avant d'être enroulé sur le mandrin 1. La lamelle représentée à la figure 2 comprend, une partie centrale 5 de forme à peu près rectangulaire et deux autres parties 6 et 7 de formes également à peu près rectangulaires qui s'étendent selon deux directions opposées l'une à l'autre aux extrémités de la partie centrale. Sur la figure 2, des directions des grands côtés 6₁ , 6₂ d'une part, et 7₁ , 7₂ d'autre part, des parties rectangulaires 6 et 7 sont perpendiculaires à la direction des grands côtés 5₁ et 5₂ du rectangle formant la partie centrale 5.The current transformer according to the invention which is shown in Figure 1 comprises a mandrel 1 made of plastic, or any other equivalent insulating material, on which are successively wound, a primary winding 2, a metal screen 3 and a secondary winding 4. The primary winding 2 is constituted by a strip which is cut from a sheet of metal foil according to the S-shaped outline shown in FIG. 2, before being wound on the mandrel 1. The strip shown in FIG. 2 includes a central part 5 of roughly rectangular shape and two other parts 6 and 7 of also roughly rectangular shapes which extend in two directions opposite to each other at the ends of the central part. In FIG. 2, directions of the long sides 6₁, 6₂ on the one hand, and 7₁, 7₂ on the other hand, rectangular parts 6 and 7 are perpendicular to the direction of the long sides 5₁ and 5₂ of the rectangle forming the central part 5.

La longueur L des grands côtés 5₁ , 5₂ de la partie centrale est déterminée pour permettre aux extrémités 6 et 7 d'être en prolongement l'une de l'autre lorsque la partie centrale 5 est enroulée sur le mandrin 1 et les angles formés par les bords adjacents de la lamelle correspondant d'une part, aux côtés 5₂ , 6₂ et d'autre part, aux côtés 5₁ , 7₁ sont tronqués selon une même direction, à 45° par exemple de la direction des côtés 5₁ et 5₂ , pour former les bords 8 et 9 de la figure 2, et éviter le chevauchement des extrémités de la partie centrale 5 lorsqu'elle est enroulée sur le mandrin 1 de la manière représentée la figure 3.The length L of the long sides 5₁, 5₂ of the central part is determined to allow the ends 6 and 7 to be in extension of one another when the central part 5 is wound on the mandrel 1 and the angles formed by the adjacent edges of the corresponding lamella on the one hand, at the sides 5₂, 6₂ and on the other hand, at the sides 5₁, 7₁ are truncated in the same direction, at 45 ° for example from the direction of the sides 5₁ and 5₂, for form the edges 8 and 9 of FIG. 2, and avoid overlapping the ends of the central part 5 when it is wound on the mandrel 1 in the manner shown in FIG. 3.

L'écran 3 qui est représenté à la figure 4 permet d'effectuer le blindage électrostatique du transformateur et de limiter les capacités parasites entre primaire et secondaire. Les isolements entre l'écran 3 et les enroulements primaire et secondaire sont réalisés de façon connue à l'aide d'une ou plusieurs couches de feuilles de PTFE (abréviation de polytétrafluoréthylène) ou de papier adhésif.The screen 3 which is represented in FIG. 4 makes it possible to carry out the electrostatic shielding of the transformer and to limit the stray capacitances between primary and secondary. The isolations between the screen 3 and the primary and secondary windings are carried out in a known manner using one or more layers of PTFE sheets (abbreviation of polytetrafluoroethylene) or of adhesive paper.

Claims (4)

  1. A high frequency air core current transformer, comprising on the one hand a primary winding (2) constituted by a conductive blade wound on an insulating spool (1) and on the other hand a secondary winding (4) with N touching turns of enameled wire wound over the conductive blade, characterized in that primary winding comprises a central rectangular part (5) whose large sides (5₁ and 5₂) extend as one turn about the spool in a first direction, and two parts (6 and 7) positioned at the ends, considered in this first direction, of the central part (5), they also having a substantially rectangular form, the large sides of these two parts (6₁,6₂,7₁, and 7₂) each extending along a second or third direction, having opposite directions to each other and each being substantially parallel to the first direction, said two parts being colinear when the central part (5) is wound on the spool (1) and in that the ends (5₁ and 5₂) central part are truncated (8 and 9) in order to avoid overlap of the ends of this central part (6 and 7) when this central part (5) is wound on the spool (1).
  2. The transformer as claimed in claim 1, characterized in that the spool (1) is constituted by a tube of synthetic resin material.
  3. The transformer as claimed in claim 1 or claim 2, characterized in that it comprises a screen (3) placed between the primary winding (2) and the secondary winding (4).
  4. The transformer as claimed in any one of the preceding claims 1 through 3, characterized in that the blade (2) is cut from copper foil.
EP86402512A 1985-11-19 1986-11-12 Coreless-type high-frequency current transformer Expired - Lifetime EP0225241B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8517084 1985-11-19
FR8517084A FR2590400B1 (en) 1985-11-19 1985-11-19 HIGH FREQUENCY AIR INTENSITY TRANSFORMER

Publications (2)

Publication Number Publication Date
EP0225241A1 EP0225241A1 (en) 1987-06-10
EP0225241B1 true EP0225241B1 (en) 1991-07-17

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Application Number Title Priority Date Filing Date
EP86402512A Expired - Lifetime EP0225241B1 (en) 1985-11-19 1986-11-12 Coreless-type high-frequency current transformer

Country Status (4)

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US (1) US4748430A (en)
EP (1) EP0225241B1 (en)
DE (1) DE3680299D1 (en)
FR (1) FR2590400B1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08330142A (en) * 1995-06-05 1996-12-13 Motorola Inc Surface installation electron component with grooved core and its preparation
US6160467A (en) * 1995-08-09 2000-12-12 Visteon Global Technologies, Inc. Transformer with center tap
US6660412B2 (en) * 2001-03-15 2003-12-09 Waseem A. Roshen Low loss, high frequency composite magnetic material and methods of making the same
FR2867916B1 (en) * 2004-03-17 2006-08-11 Lohr Ind HIGH VOLTAGE HIGH VOLTAGE ELECTRIC GENERATOR WITH LOW INTERNAL RESISTANCE AND HIGH ENERGY EFFICIENCY
CN1762509B (en) * 2004-10-20 2010-05-26 合肥奥力智能***有限公司 Acupoint electrostimulation device and method for improving cerebral function
US20090302986A1 (en) * 2008-06-10 2009-12-10 Bedea Tiberiu A Minimal-length windings for reduction of copper power losses in magnetic elements
US9287030B2 (en) * 2011-05-26 2016-03-15 Franc Zajc Multi gap inductor core
US10998124B2 (en) * 2016-05-06 2021-05-04 Vishay Dale Electronics, Llc Nested flat wound coils forming windings for transformers and inductors

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US2081979A (en) * 1934-08-28 1937-06-01 Rca Corp Ignition coil system
US2860312A (en) * 1953-12-23 1958-11-11 Sarkes Tarzian Antenna input transformer
FR1133764A (en) * 1954-10-29 1957-04-02 Ferranti Ltd Windings improvements for transformers, reactors or other electromagnetic induction devices
AT237735B (en) * 1961-12-02 1965-01-11 Siemens Ag Process for the production of windings for transformers
US3312919A (en) * 1963-12-30 1967-04-04 Berkleonics Inc Shielded transformers
US3360754A (en) * 1965-06-29 1967-12-26 Wagner Electric Corp Transformer having reduced differential impedances between secondary portions
US3826967A (en) * 1973-05-29 1974-07-30 Pioneer Magnetics Inc Low leakage secondary circuit for a power transformer including conductive strips forming the secondary and connections for rectifying diodes
US4176335A (en) * 1977-10-25 1979-11-27 Burroughs Corporation Electrical conducting apparatus
DK142518B (en) * 1978-01-30 1980-11-10 Rovsing As Christian Transformer.

Also Published As

Publication number Publication date
US4748430A (en) 1988-05-31
DE3680299D1 (en) 1991-08-22
FR2590400B1 (en) 1987-12-18
EP0225241A1 (en) 1987-06-10
FR2590400A1 (en) 1987-05-22

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