EP1745527A1 - 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

Info

Publication number
EP1745527A1
EP1745527A1 EP05741826A EP05741826A EP1745527A1 EP 1745527 A1 EP1745527 A1 EP 1745527A1 EP 05741826 A EP05741826 A EP 05741826A EP 05741826 A EP05741826 A EP 05741826A EP 1745527 A1 EP1745527 A1 EP 1745527A1
Authority
EP
European Patent Office
Prior art keywords
antenna arrangement
arrangement according
magnetic
magnetic core
energy
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
Application number
EP05741826A
Other languages
German (de)
English (en)
Other versions
EP1745527B1 (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

Links

Classifications

    • 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. Basically, it is possible to transmit energy and information using electrical or magnetic dipoles. Depending on the control circuit, electromagnetic waves or only predominantly electrical or magnetic fields are generated. It may be desirable not to emit electromagnetic waves, but to limit the generation of magnetic fields, in order to avoid, for example, the effect on organic tissue in the vicinity of the antenna. In particular, the radiation of magnetic fields or the inductive coupling to a magnetic antenna can transmit relatively high energies without galvanic coupling. The effect of such a coupling is limited to a narrow spatial area smaller than about Im. Nevertheless, there are many possible applications for such a transmission.
  • soft magnetic powder composites can be used as pressed magnetic cores.
  • these can consist of iron powder.
  • effective permeabilities between approximately 10 and 30 can be achieved.
  • saturation induction is around 1.0 to 1.4 T.
  • powder composites made of soft magnetic crystalline Iron-aluminum-silicon alloys and iron-nickel alloys are known, with which application frequencies up to over 100 kHz can be achieved.
  • AI magnetic cores are known, which are produced by injection molding from an injection-moldable plastic and a nanocrystalline alloy.
  • Nanocrystalline alloys are known, for example, from EP 0271657 A2 and EP 0455113 A2. Alloys of this type are produced, for example, by means of rapid starter 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 with particle sizes smaller than 2mm. So-called flakes with thicknesses between 0.01 and 0.04 mm and widths or lengths of 0.04 to preferably arise
  • the present invention is based on the object of providing an antenna arrangement for use in the inductive transmission of energy.
  • the present invention aims at the effective energy transmission in the near field and the reliable functioning independently of a precise positioning of the antenna arrangement in relation to a receiver to which the energy is to be transmitted inductively.
  • the setting of very specific magnetic properties, in particular a sufficient flux with suitable radiation characteristics, is necessary in the antenna arrangement.
  • powers between approximately 1 W and 100 W are to be transmitted from a transmitter to a receiver over a distance between approximately 0.5 and 50 cm. Examples of this are all devices that have to be supplied with energy temporarily or permanently. Because of the exclusively inductive coupling, a frequency range from 10 kHz to 150 kHz is particularly suitable due to the availability of this frequency band and the boundary conditions. In addition, a magnetic flux of at least 20 ⁇ Wb must be achieved in the magnetic core. Since such antennas, as are used in the present antenna arrangement, mostly represent the inductive part of a resonance 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 radiation.
  • a temperature-independent permeability is required, which is between 30 and 200 for optimal flow control. If the permeability is higher, the flux bundling in the core is so good that too little flux portion emerges from the side of the core and the field strength along the core, i.e. in the receiver area, becomes very inhomogeneous.
  • the magnetic core contains as a composite material a soft magnetic component made of finely divided particles and a plastic component, the magnetic core having 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 made of a nanocrystalline material. This has a saturation magnetization of approx. 1 to 1.6T and permeabilities> 30,000.
  • the magnetic circuit is through the microscopic gaps between the flakes are interrupted and lower effective permeabilities from 30 to 100 can be set with high quality and constant temperature. Nevertheless, there is a high achievable flux density greater than 0.6 T, typically also greater than 0.9 T.
  • the soft magnetic component of the magnetic core also advantageously has the property that the particles are individually electrically insulated by a surface layer. This can be achieved, for example, by means of surface oxidation or plastic coating.
  • the particle size can advantageously be less than 2 mm, the particle thicknesses being less than 0.5 mm. This configuration of the particles results in particularly low magnetic reversal losses and thus a particularly high quality of the antenna.
  • the mechanical properties can be adjusted depending on the type and proportion of the plastic used with regard to fracture toughness and flexibility as well as its temperature dependence.
  • plastic components can be used as plastic components
  • thermoplastics or thermosets such as polyamide, polyacrylate, polyacetate, polyimide or epoxy resin can be selected depending on the desired mechanical and thermal properties.
  • the antenna arrangement as a magnetic core has a rod or a plate which is provided with a winding. Certain core cross sections are necessary in order to make the arrangement usable for the effective transmission of energy. Should be a middle one at heart
  • the coil length of the winding should be greater than its diameter, preferably large compared to the diameter.
  • An essential property of the material used according to the invention is the mechanical insensitivity to shock or vibrations and the free shaping in the context of the manufacture or a subsequent flexibility. Because of its magnetic properties, the material used according to the invention also allows a small size, which is desirable in many fields of application for reasons of cost, space and design.
  • a plurality of windings can be arranged on the same magnetic core, the longitudinal axes of the windings being at an angle> 0 °, for example 90 ° to one another.
  • the windings can be controlled simultaneously, out of phase or alternately, in order to reach receivers for inductive energy transmission in different positions. This makes energy transmission more reliable and less sensitive to the relative positioning of the transmitter and receiver.
  • the invention also relates to various operating methods of the antenna arrangement according to the invention with intermittent operation of the different windings or the phase-shifted simultaneous activation of the different windings.
  • the antenna arrangement according to the invention is also designed to be space-saving, it can additionally be useful to provide a recess within a magnetic core in which electronic components, for example the control 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 control circuit and simply inserted as an integral structural unit in a device.
  • FIG. 1 shows a plate-shaped rectangular design of a magnetic core with a winding
  • FIG. 2 shows a corresponding magnetic core with two windings
  • FIG. 3 shows a rod-shaped magnetic core with a winding
  • FIG. 4 shows a rod-shaped magnetic core with an integrated winding and pole pieces
  • Figure 5 shows a magnetic core with a recess
  • Figure 6 shows an application of the antenna arrangement with two magnetic cores.
  • Figure 1 shows a flat magnetic core 1 with a winding 2, wherein the dimensions of the magnetic core can 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.
  • the configuration of the winding for example a compression of the windings towards the winding ends, produces a flux density that is as homogeneous as possible over the core surface.
  • FIG. 2 shows a combination of two windings 3, 4 which are perpendicular to one another on a magnetic core 5 which is designed almost as a square plate.
  • the entire arrangement according to FIG. 1 or 2 can be flexible. In any case, however, it is less sensitive to breakage than, for example, an antenna with a ferrite core or a core made of another conventional material.
  • FIG. 3 shows a rod-shaped magnetic core which is particularly suitable for the transmission of energy to a moving receiver, the direction of movement and the antenna of the receiver being directed parallel to the longitudinal axis 6 of the winding 7.
  • FIG. 6 shows two different magnetic cores 8, 9, each of which has a separate winding and whose longitudinal axes are perpendicular to one another in order to enable different flux densities and radiation characteristics.
  • This is an alternative embodiment to that shown in FIG. 2 with multiple windings on a single magnetic core.
  • FIG. 4 shows an arrangement in which the winding 10 is integrated in a magnetic body 11 insofar as it is the
  • Magnetic core 11 passes through itself, so that a lower part of the magnetic core 11 in FIG. 4 forms a yoke that short-circuits the magnetic flux on the underside.
  • a shielding effect in one direction (downward) with good radiation upward is achieved.
  • the casting method shown in WO 0191141 A1 is particularly suitable for producing such an arrangement, in which the winding can also be cast in during the production of the magnetic core.
  • FIG. 5 shows a recess 15 in the magnetic core 14, which allows components of an electronic circuit to be accommodated there, for example for controlling the winding 16.
  • FIG. 6 shows an application example of the antenna arrangement according to the invention with a mobile communication terminal, for example a cell phone or a cordless telephone 17, which has a receiving device (not shown in more detail) for inductive coupling to the antenna arrangement 18.
  • the antenna arrangement 18 has a housing 19, the two magnetic cores 8, 9, each of which is provided with a winding and can inductively transmit energy to the receiver in the terminal 17.
  • a capacitor or rechargeable battery is provided in the terminal 17 for storing the transmitted energy.
  • the same arrangement can also be used for the retransmission of information, or a signal, which is either also transmitted inductively, switching between sending and receiving, or by evaluating the energy consumption of the receiver ,

Landscapes

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

Abstract

Ensemble antenne pour la transmission inductive d'énergie à l'aide de noyaux magnétiques constitués d'une matière composite contenant des paillettes amorphes ou nanocristallines et un plastique coulé, ce qui permet d'obtenir un ensemble antenne possédant des propriétés magnétiques adaptées pour une transmission efficace d'énergie et possédant simultanément une haute résistance à la rupture et des dimensions minimes.
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 true EP1745527A1 (fr) 2007-01-24
EP1745527B1 EP1745527B1 (fr) 2013-04-17

Family

ID=34967320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05741826.1A Expired - Lifetime EP1745527B1 (fr) 2004-05-13 2005-05-13 Ensemble antenne pour la transmission inductive d'energie et utilisation dudit ensemble antenne

Country Status (5)

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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Publication number Publication date
WO2005112192A1 (fr) 2005-11-24
JP2007537637A (ja) 2007-12-20
DE102004023815A1 (de) 2005-12-08
US7545337B2 (en) 2009-06-09
WO2005112192A9 (fr) 2006-02-09
US20070126650A1 (en) 2007-06-07
EP1745527B1 (fr) 2013-04-17

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