EP0225241B1 - Kernloser Hochfrequenz-Stromtransformator - Google Patents

Kernloser Hochfrequenz-Stromtransformator 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
Authority
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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English (en)
French (fr)
Other versions
EP0225241A1 (de
Inventor
Noel Guais
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.)
General Electric CGR SA
Original Assignee
General Electric CGR SA
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 General Electric CGR SA filed Critical General Electric CGR SA
Publication of EP0225241A1 publication Critical patent/EP0225241A1/de
Application granted granted Critical
Publication of EP0225241B1 publication Critical patent/EP0225241B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F27/02—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.

Landscapes

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

Claims (4)

  1. Hochfrequenter kernloser Stromtransformator, der einerseits eine Primärwicklung (2), die durch eine um einen isolierenden Dorn (1) gewickelte leitende Lamelle gebildet wird, und andererseits eine Sekundärwicklung (4) mit N nebeneinanderliegenden Windungen aus Emaildraht, die auf die leitende Lamelle gewickelt sind, aufweist, dadurch gekennzeichnet, daß die Primärwicklung einen rechteckigen Mittelteil (5), dessen lange Seiten (5₁, 5₂) sich in einer ersten Richtung in einem Umlauf um den Dorn erstrecken, und zwei Teile (6, 7), die, gemessen in dieser ersten Richtung, an den Enden des Mittelteils (5) angeordnet sind und ebenfalls annähernd rechteckig geformt sind, aufweist, wobei sich die langen Seiten dieser zwei Teile (6₁, 6₂, 7₁, 7₂) jeweils entweder in einer zweiten oder in einer dritten, zur zweiten entgegengesetzten Richtung und jeweils im wesentlichen senkrecht zur ersten Richtung erstrekken, wobei diese zwei Teile kollinear sind, wenn der Mittelteil (5) um den Dorn (1) gewickelt ist, und daß die Enden (5₁, 5₂) des Mittelteils abgeschrägt sind (8, 9), um die Überlappung der Enden (6, 7) dieses Mittelteils zu vermeiden, wenn dieser Mittelteil (5) auf den Dorn (1) gewickelt wird.
  2. Transformator gemäß Anspruch 1, dadurch gekennzeichnet, daß der Dorn (1) durch ein Rohr aus Kunststoffmaterial gebildet wird.
  3. Transformator gemäß einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß er eine zwischen die Primärwicklung (2) und die Sekundärwicklung (4) eingesetzte Abschirmung (3) umfaßt.
  4. Transformator gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Lamelle (2) aus einer Kupferfolie ausgeschnitten wird.
EP86402512A 1985-11-19 1986-11-12 Kernloser Hochfrequenz-Stromtransformator Expired - Lifetime EP0225241B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8517084A FR2590400B1 (fr) 1985-11-19 1985-11-19 Transformateur d'intensite haute frequence a air
FR8517084 1985-11-19

Publications (2)

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

Family

ID=9324955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402512A Expired - Lifetime EP0225241B1 (de) 1985-11-19 1986-11-12 Kernloser Hochfrequenz-Stromtransformator

Country Status (4)

Country Link
US (1) US4748430A (de)
EP (1) EP0225241B1 (de)
DE (1) DE3680299D1 (de)
FR (1) FR2590400B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08330142A (ja) * 1995-06-05 1996-12-13 Motorola Inc 溝付きコアを有する表面実装電子部材とその製造方法
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 (fr) * 2004-03-17 2006-08-11 Lohr Ind Generateur electrique de haute tension en haute frequence a faible resistance interne et a haut rendement energetique
CN1762509B (zh) * 2004-10-20 2010-05-26 合肥奥力智能系统有限公司 一种能促进大脑功能的穴位电刺激装置和穴位电刺激方法
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)

* Cited by examiner, † Cited by third party
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 (fr) * 1954-10-29 1957-04-02 Ferranti Ltd Perfectionnements aux enroulements pour transformateurs, réactances ou autres appareils électromagnétiques d'induction
AT237735B (de) * 1961-12-02 1965-01-11 Siemens Ag Verfahren zur Herstellung von Wicklungen für Transformatoren
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 (da) * 1978-01-30 1980-11-10 Rovsing As Christian Transformer.

Also Published As

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

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