EP0225241A1 - Kernloser Hochfrequenz-Stromtransformator - Google Patents
Kernloser Hochfrequenz-Stromtransformator Download PDFInfo
- Publication number
- EP0225241A1 EP0225241A1 EP86402512A EP86402512A EP0225241A1 EP 0225241 A1 EP0225241 A1 EP 0225241A1 EP 86402512 A EP86402512 A EP 86402512A EP 86402512 A EP86402512 A EP 86402512A EP 0225241 A1 EP0225241 A1 EP 0225241A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- central part
- mandrel
- wound
- transformer according
- sides
- 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.)
- Granted
Links
Images
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.
- the object of the invention is to overcome the aforementioned drawbacks.
- the subject of the invention is a high frequency air intensity transformer, characterized in that it comprises: on the one hand, a primary winding formed by a conductive strip wound on an insulating mandrel comprising, a rectangular central part whose long sides extend in a first direction, and two parts located at the ends of the central part of slightly near rectangular, the long sides of which extend in a second and a third direction in opposite directions, the length of the central part measured in the first direction being determined to allow the two ends to have the directions of their long collinear sides two by two when the central part, considered in the first direction is wound on the mandrel and in that the two angles formed at the crossing of the edges of the parts situated at the ends with the edges adjacent to the long sides of the part central, are truncated to avoid overlapping of the two ends when the central part is wound on the mandrel, and on the other hand, a secondary winding with N contiguous turns of enameled wire wound above the conductive strip.
- 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 one another 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 of 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 parasitic capacities 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)
- Coils Of Transformers For General Uses (AREA)
- Insulating Of Coils (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8517084 | 1985-11-19 | ||
FR8517084A FR2590400B1 (fr) | 1985-11-19 | 1985-11-19 | Transformateur d'intensite haute frequence a air |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0225241A1 true EP0225241A1 (de) | 1987-06-10 |
EP0225241B1 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) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Families Citing this family (7)
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 |
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 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2860312A (en) * | 1953-12-23 | 1958-11-11 | Sarkes Tarzian | Antenna input transformer |
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 |
US4236133A (en) * | 1978-01-30 | 1980-11-25 | Christian Rovsing A/S | Transformer with foil windings |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2081979A (en) * | 1934-08-28 | 1937-06-01 | Rca Corp | Ignition coil system |
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 |
-
1985
- 1985-11-19 FR FR8517084A patent/FR2590400B1/fr not_active Expired
-
1986
- 1986-11-12 EP EP86402512A patent/EP0225241B1/de not_active Expired - Lifetime
- 1986-11-12 DE DE8686402512T patent/DE3680299D1/de not_active Expired - Fee Related
- 1986-11-17 US US06/931,087 patent/US4748430A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2860312A (en) * | 1953-12-23 | 1958-11-11 | Sarkes Tarzian | Antenna input transformer |
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 |
US4236133A (en) * | 1978-01-30 | 1980-11-25 | Christian Rovsing A/S | Transformer with foil windings |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Also Published As
Publication number | Publication date |
---|---|
US4748430A (en) | 1988-05-31 |
DE3680299D1 (en) | 1991-08-22 |
EP0225241B1 (de) | 1991-07-17 |
FR2590400B1 (fr) | 1987-12-18 |
FR2590400A1 (fr) | 1987-05-22 |
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