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
  • H01F27/2804—Printed windings

Definitions

• the present invention relates to a winding for a planar transformer comprising at least one primary winding and at least one secondary winding, and more particularly such a winding of the type of which the primary and secondary windings comprise turns formed in the form of conductive tracks formed on the faces.
• a transformer winding in planar technology, consists of at least two portions of conductive tracks produced on different faces of one or more planar insulating supports stacked so as to be able to present connection terminals arranged on the periphery of the transformer, this in order to facilitate the electrical connection of the transformer.
• the portions of conductive tracks of the same winding follow spirals in the same direction and are electrically connected together to ensure continuity of the winding, by the inner ends of their spirals and, as necessary, by some of the ends. outside of their spirals by means of conductive holes passing through the insulating support or supports.
• the conductive tracks of the primary and secondary windings of a transformer are nested on the flat insulating supports so that when one moves from the outside towards the center of a transformer, on any of the flat insulating supports, an alternation of primary and secondary turns.
• the subject of the invention is a winding for a planar transformer comprising at least one primary winding and at least one secondary winding with turns formed in the form of conductive tracks formed on the faces of an insulating support and connected together by means of conductive holes drilled in the insulating support, characterized in that the portions of the primary and secondary windings carried by the same face of the insulating support are grouped by winding, in two distinct nested zones, of spiral shapes, one of the zones grouping side by side of the turns or portions of turns of the primary winding and the other zone grouping side by side of the turns or portions of turns of the secondary winding.
• a transformer produced according to the invention can therefore comprise fewer support layers, even if it generally comprises several, and therefore be less expensive and less bulky.
• each winding portion forms a turn which extends over approximately 360 °.
• This arrangement has the advantage of being simple, since it easily leads to complete turns when two winding portions are electrically connected to each other by a conductive hole joining the inner ends of their turns.
• At least one of the windings is formed on each face of the support from a plurality of winding portions joined successively from one face to the other of the support in series by conductive holes.
• the turns of each winding have shapes such that they provide superimposed recesses in which the conductive holes of the other winding pass.
• the present invention also relates to a multiple winding for planar transformer, comprising a plurality of windings as described above arranged one above the other on a plurality of assembled supports, the primary and secondary windings respectively of said windings being electrically connected to each other. Said windings can then be connected either in series or in parallel.
• FIG. 1 is a perspective view of a transformer winding according to the invention
• FIG. 2 and 3 illustrate, respectively in perspective and in top view, a winding portion according to the invention
• FIG. 4 illustrates another embodiment of a winding according to the invention, a single winding being shown
• FIG. 5 is a perspective view of another embodiment of the invention.
• FIG. 1 shows two identical elementary windings 1 and 2 joined together in a multiple winding.
• Each of the windings is formed by a nested primary winding and a secondary winding, each being partially produced on each of the upper and lower faces of the support on which this elementary winding is formed.
• the primary winding for example, is formed of a first conductive section 3 extending approximately 360 ° around the axis of the winding, to form a first turn on the upper face of the support, and of a second section conductor 4 also extending approximately over 360 ° around the axis of the winding, to form a second turn on the underside of the support.
• the secondary winding is formed by a first conductive section 5 extending approximately over 360 ° around the axis of the winding, to form a first turn on the upper face of the support, and a second conductive section 6 also extending approximately over 360 ° around the winding axis, to form a second turn on the underside of the support.
• each winding has only one turn per side, this means that each turn of each winding passes between the ends of the turn of the other winding formed on the same face of the support.
• each turn has a free end, the connection of which will be described below.
• each turn of each winding is located, on one side of the support, opposite the other end of the turn of the same winding, on the other side of the support. These opposite ends are connected by conductive holes 7 ( Figure 2) to ensure the electrical continuity of each winding from one of its free ends to the other.
• each winding has shapes such that they provide for overlapping recesses 8.
• the conductive holes of the other winding pass through these recesses, which ensures optimal recovery of the primary and secondary windings, and therefore good performance from the magnetic point of view.
• the free ends of the primary winding are connected to two connecting conductors 9 and 10 (here, double), perpendicular to the plane of the support and arranged side by side.
• the free ends of the secondary winding are connected to two similar connecting conductors 1 1 and 12 (one of which, here, is double).
• the primary and secondary connection conductors are produced in a known manner in the form of conductive holes, during the assembly of the superimposed supports.
• FIG. 4 shows a multiple winding, primary or secondary, where three elementary windings are connected in series on four conductive holes 13a-13d.
• the arrangement of Figure 4 does not differ not otherwise than that of FIG. 1 and will therefore not be described in more detail.
• the primary winding (for example) 20 and the connections of the windings to the conductive holes 21 a-21 d are identical to those of FIG. 1. We will therefore only describe the secondary winding 22.
• the first turn 22a extends on the upper face of the support from the conductive hole 21c, outside the winding, up towards the inside of the winding.
• the winding then continues through a conductive hole 23a, where it passes through the support.
• the second turn 22b therefore extends on the underside of the support, from the conductive hole 23a to another conductive hole 23b, near the conductive hole 21 c.
• the third turn 22c again extends to the upper face, inside the turn 22a, from the conductive hole 23b to the conductive hole 23c near the conductive hole 23a.
• the winding thus continues in series through the turn 22d, the conductive hole 23d, the turn 22e, the conductive hole 23e, and the turn 22f, connected to the conductive hole 21 d.
• the three turns 22a, 22c and 22e of the secondary winding 22 carried by the upper face of the support are arranged side by side in the same zone reserved so to speak for the secondary winding 22.
• This zone in the form spiral is nested with another zone also in the form of a spiral, which is it, reserved for the split coil 20b of the primary winding 20.
• winding which has just been described in relation to FIG. 5, can obviously be associated with others in parallel or in series, as in FIGS. 1 or 4 respectively.

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

Applications Claiming Priority (3)

Publications (2)

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ID=9514993

Family Applications (1)

Country Status (6)

Cited By (1)

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Family Cites Families (7)

• 1997
  • 1997-12-23 FR FR9716347A patent/FR2772973B1/fr not_active Expired - Fee Related
• 1998
  • 1998-12-23 US US09/581,223 patent/US6606022B1/en not_active Expired - Lifetime
  • 1998-12-23 WO PCT/FR1998/002853 patent/WO1999034379A1/fr not_active Ceased
  • 1998-12-23 EP EP98963613A patent/EP1042768B1/de not_active Expired - Lifetime
  • 1998-12-23 CA CA002315894A patent/CA2315894A1/fr not_active Abandoned
  • 1998-12-23 DE DE69809595T patent/DE69809595T2/de not_active Expired - Lifetime

Non-Patent Citations (1)

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