EP1745527B1 - Ensemble antenne pour la transmission inductive d'energie et utilisation dudit ensemble antenne - Google Patents

Ensemble antenne pour la transmission inductive d'energie et utilisation dudit ensemble antenne Download PDF

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Publication number
EP1745527B1
EP1745527B1 EP05741826.1A EP05741826A EP1745527B1 EP 1745527 B1 EP1745527 B1 EP 1745527B1 EP 05741826 A EP05741826 A EP 05741826A EP 1745527 B1 EP1745527 B1 EP 1745527B1
Authority
EP
European Patent Office
Prior art keywords
antenna arrangement
arrangement according
magnetic
magnetic core
windings
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
EP05741826.1A
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German (de)
English (en)
Other versions
EP1745527A1 (fr
Inventor
Wulf Guenther
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP1745527A1 publication Critical patent/EP1745527A1/fr
Application granted granted Critical
Publication of EP1745527B1 publication Critical patent/EP1745527B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material

Definitions

  • the invention relates to an antenna arrangement with an open magnetic core and a winding.
  • the invention is in the field of magnetic field antennas used for inductive energy transmission.
  • it is possible to transmit energy and information by means of electric or magnetic dipoles.
  • electromagnetic waves or only predominantly electrical or magnetic fields are generated. It may be desirable not to emit electromagnetic waves but to confine itself to the generation of magnetic fields, for example to avoid exposure to organic tissue around the antenna.
  • relatively high energies can be transmitted without a galvanic coupling. The effect of such coupling is limited to a narrow spatial area less than about 1 meter. Nevertheless, there are many possible applications for such a transmission.
  • soft magnetic powder composite materials can be used as pressed magnetic cores.
  • these may consist of iron powder.
  • effective permeabilities between about 10 and 30 can be achieved.
  • saturation inductions are approximately 1.0 to 1.4 T.
  • powder composite materials of soft magnetic crystalline Iron-aluminum-silicon alloys and iron-nickel alloys are known, with which application frequencies can be achieved to over 100 kHz.
  • Magnetic cores are known, which are produced by injection molding of an injection-moldable plastic and a nanocrystalline alloy.
  • Corresponding nanocrystalline alloys are for example from EP 0271657 A2 and the EP 0455113 A2 known.
  • Such alloys are produced, for example, by means of rapid solidification technology in the form of thin alloy strips which are initially amorphous and which are subjected to a heat treatment to form a nanocrystalline structure.
  • Such alloys can be ground to alloy powders having particle sizes less than 2mm.
  • so-called flakes with thicknesses between 0.01 and 0.04 mm and widths or lengths of 0.04 to 1 mm per particle arise.
  • These flakes can be processed into composite materials using synthetic resins, in which saturation magnetizations greater than 0.5 Tesla and permeabilities between 10 and 200 can be realized.
  • a manufacturing method for such magnetic cores is for example in the WO 0191141 A1 shown.
  • transponders which also consist of soft magnetic powder composite materials, such as amorphous alloys. Such antennas are used there for the exchange of information.
  • the present invention is based on the object of providing an antenna arrangement for use in the inductive transmission of energy, regardless of a precise positioning of the antenna arrangement relative to a receiver.
  • the present invention aims at the effective transmission of energy in the near field region and the reliable functioning independently of a precise positioning of the antenna arrangement relative to a receiver, to which the energy is to be transmitted by inductive means.
  • the setting of very specific magnetic properties, in particular a sufficient flow with a suitable radiation characteristic in the antenna arrangement is necessary.
  • antennas as used in the present antenna arrangement, usually represent the inductive part of a resonant circuit, a high antenna quality of at least 50, preferably even 100 in the range of the operating frequency is desirable for optimizing the energy dissipation.
  • a temperature-independent permeability is required, which is for optimal flow control between 30 and 200. With higher permeability, the flux bundling in the core is so good that laterally too low a flow component emerges from the core and the field strength along the core, ie in the receiver region, becomes highly inhomogeneous.
  • the object underlying the present invention can not be solved satisfactorily with the known magnet arrangements, magnetic cores and materials.
  • the magnetic core contains as a composite material a soft magnetic component of finely divided particles and a plastic component, wherein the magnetic core has an initial permeability between 20 and 200 and a saturation induction> 0.6 T.
  • the soft magnetic component advantageously consists of the already mentioned flakes of a nanocrystalline material. This has a saturation magnetization of about 1 to 1.6T and permeabilities> 30,000.
  • a plastic component of the magnetic circuit By mixing with a plastic component of the magnetic circuit is through the microscopic gaps between the flakes are interrupted and it is possible to set lower effective permeabilities of 30 to 100 with high quality and temperature stability. Nevertheless, a high achievable flux density greater than 0.6 T, typically greater than 0.9 T.
  • the soft magnetic component of the magnetic core also has the advantageous advantage that the particles are each electrically isolated by a surface layer. This can be realized for example by surface oxidation or plastic coating.
  • the particle size may advantageously be less than 2 mm, wherein the particle thicknesses may be smaller than 0.5 mm. As a result of this configuration of the particles, particularly low loss of magnetization losses and thus a particularly high quality of the antenna are achieved.
  • the mechanical properties can be adjusted with regard to the type and proportion of the plastic used with regard to fracture toughness and flexibility
  • thermosets or thermosets such as polyamide, polyacrylate, polyacetate, polyimide or epoxy resin depending on the desired mechanical and thermal properties.
  • the antenna arrangement as a magnetic core on a rod or a plate, which are provided with a winding. Certain core cross-sections are necessary to make the arrangement usable for the effective transmission of energy. If an average flux of at least 20 ⁇ Wb is to be achieved in the core, this results in an induction of 400 mT with a cross section of 0.5 cm 2 . This corresponds to about half of the cross section, which would be necessary when using a soft ferrite.
  • the coil length of the winding should be greater than its diameter, preferably large compared to the diameter.
  • An essential feature of the material used according to the invention is the mechanical insensitivity to shock or vibration and the free shaping during the production or a subsequent flexibility.
  • the inventively used material also allows because of its magnetic properties also a small size, as it is desirable for cost, space and design reasons in many applications.
  • a plurality of windings may be arranged on the same magnetic core, wherein the longitudinal axes of the windings are at an angle> 0 °, for example 90 ° to each other.
  • the windings may be driven simultaneously, out of phase or alternately to reach inductive energy transfer receivers in different positions. This makes the transmission of energy more reliable and less sensitive to the relative positioning of transmitter and receiver.
  • the invention also relates to various operating methods of the antenna arrangement according to the invention with intermittent operation of the various windings or the mentioned phase-shifted simultaneous driving of the different windings.
  • the antenna arrangement according to the invention is also designed to save space, it may additionally be useful to provide a recess within a magnetic core in which electronic components, for example the drive circuit of the antenna arrangement, can be accommodated.
  • the flow guidance within the magnetic core is hardly negatively influenced by such recesses, if they are not too large.
  • the antenna arrangement can advantageously be prefabricated with the drive circuit and simply used as an integral unit in a device.
  • FIG. 1 shows a flat magnetic core 1 with a winding 2, wherein the dimensions of the magnetic core may be, for example 20 x 10 x 0.2 cm.
  • the base area of the core is preferably as large as the target area of a receiver to be covered. Due to the design of the winding, for example, a compression of the windings to the winding ends, a strong as possible homogeneous flux density over the core surface is generated.
  • the special design of the flow orientation and the radiation characteristic shows the FIG. 2 a combination of two mutually perpendicular windings 3,4 on a running almost as a square plate magnetic core 5. The two windings can be alternately sequentially or simultaneously out of phase controlled against each other.
  • the entire arrangement according to FIG. 1 or 2 be flexible. In any case, however, it is more resistant to breakage than, for example, an antenna with a ferrite core or a core made of another conventional material.
  • FIG. 3 Particularly suitable for the transmission of energy to a moving receiver is the in FIG. 3 shown arrangement with a rod-shaped magnetic core, wherein the direction of movement, as well as the antenna of the receiver is directed parallel to the longitudinal axis 6 of the winding 7.
  • FIG. 6 are two different magnetic cores 8, 9 shown, each having a separate winding and the longitudinal axes are perpendicular to each other to allow different flux densities and radiation characteristics.
  • This is an alternative embodiment to that in the FIG. 2 shown with multiple windings on a single magnetic core.
  • FIG. 4 shows an arrangement in which the winding 10 is integrated into a magnetic body 11 in so far as it passes through the magnetic core 11 itself, so that a lower part of the magnetic core 11 in the FIG. 4 forms a yoke that shorts the magnetic flux on the bottom.
  • a shielding effect in one direction (down) is achieved with good radiation upwards.
  • FIG. 5 shows in the magnetic core 14 has a recess 15, which allows there components of an electronic circuit, for example, to drive the winding 16 to accommodate.
  • FIG. 6 shows an application example of the invention- ⁇ en antenna arrangement with a mobile communication terminal, such as a mobile phone or a cordless telephone 17, which has a non-illustrated receiving device for inductive coupling with the antenna assembly 18.
  • the antenna arrangement 18 has in a housing 19, the two magnetic cores 8, 9, which are each provided with a winding and inductively can transmit energy to the receiver in the terminal 17.
  • a capacitor or battery for storing the transmitted energy is provided in addition to the receiver.
  • the same arrangement can also be used for retransmission of information, or a signal which is either also transmitted inductively, which would have to be switched between sending and receiving, or by evaluating the energy extraction of the receiver.

Landscapes

  • Soft Magnetic Materials (AREA)
  • Details Of Aerials (AREA)
  • Near-Field Transmission Systems (AREA)

Claims (11)

  1. Ensemble antenne comprenant un noyau magnétique (1, 5, 14) et au moins un enroulement (2, 3, 4, 7, 10, 16), par le moyen duquel l'énergie inductive est transmise d'un émetteur à un récepteur sur une distance comprise entre environ 0,5 et 50 cm,
    caractérisé en ce que
    le noyau magnétique (1, 5, 14) contient un matériau composite, qui comprend un composant faiblement magnétique mélangé avec un composant en plastique, dans lequel le composant faiblement magnétique comprend des particules finement distribuées faites de matériau nanocristallin ayant une magnétisation de saturation de 1 à 1,6 Tesla et une perméabilité supérieure à 30 000, de manière que le noyau magnétique (1, 5, 14) ait une perméabilité initiale efficace comprise entre 20 et 200 et une induction de saturation supérieure à 0,6 Tesla, et que le noyau magnétique (1, 5, 14) ait une capacité de chargement de flux magnétique jusqu'à au moins 20 µWb.
  2. Ensemble antenne selon la revendication 1, dans lequel le composant faiblement magnétique consiste en particules qui sont isolées électriquement individuellement par une couche de surface.
  3. Ensemble antenne selon la revendication 1 ou 2, dans lequel la taille des particules est de moins de 2 mm.
  4. Ensemble antenne selon la revendication 1, 2 ou 3, dans lequel les épaisseurs des particules sont de moins de 0,5 mm.
  5. Ensemble antenne selon l'une des revendications 2 à 4, dans lequel les particules sont oxydées en surface ou revêtues de plastique.
  6. Ensemble antenne selon l'une des revendications 1 à 5, dans lequel le composant en plastique contient un thermoplastique ou un thermodurcissable, qui peut être traité dans le cadre de techniques utilisant des résines de coulée.
  7. Ensemble antenne selon l'une des revendications 1 à 6, dans lequel l'antenne formée par le noyau magnétique (1, 5, 14) et le ou les enroulements (2, 3, 4, 7, 10, 16) a une qualité de plus de 50 dans la plage de fréquence comprise entre 20 kHz et 150 kHz.
  8. Ensemble antenne selon l'une des revendications 1 à 7, comprenant une pluralité d'enroulements (2, 3, 4, 7, 10, 16) sur le même noyau magnétique (1, 5, 14), dans lequel les axes longitudinaux (20, 21) des enroulements sont disposés les uns par rapport aux autres selon un angle de plus 0°.
  9. Ensemble antenne selon la revendication 8, dans lequel une pluralité de noyaux magnétiques (1, 5, 14) supportent les enroulements (2, 3, 4, 7, 10, 16).
  10. Ensemble antenne selon l'une des revendications 1 à 9, dans lequel un évidement (15) destiné à recevoir des composants électroniques est prévu dans au moins un des noyaux magnétiques (1, 5, 14).
  11. Procédé d'utilisation d'un ensemble antenne selon les revendications 1 à 10,
    caractérisé en que
    dans l'ensemble antenne, les différents enroulements (2, 3, 4, 7, 10, 16) sont actionnés simultanément avec déphasage ou d'une manière alternée chronologiquement.
EP05741826.1A 2004-05-13 2005-05-13 Ensemble antenne pour la transmission inductive d'energie et utilisation dudit ensemble antenne Expired - Lifetime EP1745527B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004023815A DE102004023815A1 (de) 2004-05-13 2004-05-13 Antennenanordnung und Verwendung der Antennenanordnung
PCT/EP2005/005271 WO2005112192A1 (fr) 2004-05-13 2005-05-13 Ensemble antenne pour la transmission inductive d'energie et utilisation dudit ensemble antenne

Publications (2)

Publication Number Publication Date
EP1745527A1 EP1745527A1 (fr) 2007-01-24
EP1745527B1 true EP1745527B1 (fr) 2013-04-17

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Country Link
US (1) US7545337B2 (fr)
EP (1) EP1745527B1 (fr)
JP (1) JP2007537637A (fr)
DE (1) DE102004023815A1 (fr)
WO (1) WO2005112192A1 (fr)

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US7545337B2 (en) 2009-06-09
JP2007537637A (ja) 2007-12-20
WO2005112192A9 (fr) 2006-02-09
US20070126650A1 (en) 2007-06-07
DE102004023815A1 (de) 2005-12-08
WO2005112192A1 (fr) 2005-11-24
EP1745527A1 (fr) 2007-01-24

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