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WO2015058895A1 - Ensemble permettant de fournir une liaison de charge inductive - Google Patents

Ensemble permettant de fournir une liaison de charge inductive Download PDF

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Publication number
WO2015058895A1
WO2015058895A1 PCT/EP2014/069070 EP2014069070W WO2015058895A1 WO 2015058895 A1 WO2015058895 A1 WO 2015058895A1 EP 2014069070 W EP2014069070 W EP 2014069070W WO 2015058895 A1 WO2015058895 A1 WO 2015058895A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
arrangement according
substrate
metal structure
frequency
Prior art date
Application number
PCT/EP2014/069070
Other languages
German (de)
English (en)
Inventor
Franz Eiermann
Andreas Fackelmeier
Sebastian Martius
Benjamin Sewiolo
Klaus Huber
Claus Seisenberger
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2015058895A1 publication Critical patent/WO2015058895A1/fr

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Classifications

    • 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
    • H01F38/14—Inductive couplings
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Definitions

  • the invention relates to an arrangement for providing an inductive charging connection.
  • a coil system which consists of a stationary primary coil on the ground and a secondary coil on the electric vehicle.
  • the coil system generates a magnetic alternating field, which transmits energy to the electric vehicle. Between the two coils usually remains an air gap in the range of about 70-150 cm, which must be monitored.
  • the charging process can be done while stationary or while driving; in the latter case, a plurality of stationary primary coils embedded in the pavement.
  • the primary coil is used as a metal detector.
  • electrical properties of the primary coil or the secondary coil during operation can, for example, be based on a reduction of the energy transfer or a noticeable change in the voltage, the current, the magnetic field, the reactance or the phase relationship.
  • the present invention is intended to provide an arrangement for providing an inductive charging connection which provides an alternative to the devices known from the prior art. This object is achieved by an arrangement comprising a first coil, which is adapted to produce an inductive charging connection in the kHz range with a second coil, wherein the second coil is not necessarily included in the arrangement, and wherein the first coil in particular enclosing a ferrite.
  • the arrangement is characterized by a frequency-selective shield for the first coil, which shields frequencies in the MHz range and / or in the GHz range, without affecting frequencies in the kHz range.
  • Examples of the kHz range are 1-999 kHz, as well as any cuts in the range of 1-999 kHz, about 20-50 kHz, 20-100 kHz.
  • Examples of the MHz range are 1-999 MHz, as well as any cut-outs in the range of 1-999 MHz, about 20-50 MHz, 20-lOOMHz.
  • Examples of the GHz range are 1-999 GHz, as well as any cuts in the range of 1-999 GHz, about 76-77 GHz, 50-100 GHz, 20-100 GHz.
  • Ferrites are usually used in the coils of inductive charging systems.
  • the frequency-selective shielding of the arrangement makes it possible to use these high-frequency ferrites (MHz- and / or GHz range) without disturbing the inductive charging functionality in the low frequency range (kHz range).
  • the arrangement allows the use of radar methods which operate with frequencies in the MHz GHz range when the inductive charging connection operates at full power.
  • the frequency-selective shielding prevents the sensitivity of the detection antennas from being lowered at high frequencies by the ferrites in the primary as well as in the secondary coil. As a result, it is still possible with these antennas to detect objects in the air gap even when the inductive charging connection is operating at full power.
  • the first coil is a stationary primary coil
  • the second coil is a vehicle-side secondary coil in an electric vehicle and the frequency-selective shielding is a stationary shield for the stationary primary coil.
  • the first coil is a vehicle-side secondary coil in an electric vehicle
  • the second coil a stationary primary coil and the frequency-selective shielding a vehicle-side shield for the vehicle-side secondary coil.
  • a detection means for monitoring a gap between the first coil and the second coil is provided, which is set up for frequencies in the MHz range and / or in the GHz range and arranged outside the frequency-selective shielding.
  • the detection means is a radar, in particular a Doppler radar or an FMCW radar.
  • the detection means includes a patch antenna or a dipole antenna.
  • the frequency-selective shielding includes at least one substrate, wherein a metal structure is arranged on at least one side of the at least one substrate. is assigned, wherein the metal structure comprises a plurality of non-contiguous portions, and wherein the portions of the metal structure are at least partially capacitively interconnected.
  • the generated capacitive coupling represents a short circuit for high frequencies and an idling for low frequencies.
  • a frequency selective surface results, which has a low-pass characteristic.
  • the embodiment has the advantage that a frequency-selective surface can be achieved by the substrate and the structuring of the metal surface, which shields high-frequency interference frequencies. Another advantage is that the frequency-selective shielding by patterned metal surface (e.g., a slit) becomes transmissive for frequencies in the kHz range. In addition, discrete capacitances can be used to connect parts of the metal structure. Precisely because of the combination of the approaches, there is a high degree of flexibility with regard to the design of the shielding structure and the frequencies which are to be shielded.
  • the shield for the first coil or its ferrite in the MHz and / or GHz range is as high as possible and as transparent as possible in the kHz range.
  • the shielding comprises at least one substrate, wherein a metal structure is arranged on at least one side of the at least one substrate.
  • This metal structure comprises a plurality of non-contiguous subregions, wherein adjacent subareas which are arranged on the same side of the substrate are spaced apart by a meandering boundary line. That is, adjacent edges of the portions extend in a meandering manner, thereby forming a meander-shaped spacing without metal between the edges.
  • the adjacent subareas are capacitively coupled together.
  • This embodiment has the advantage that the border line is particularly long due to its meandering shape and thus a high capacitance between the sub-areas is generated, so that without the use of discrete components, a capacitive coupling can be achieved, which for high frequencies a short circuit and represents an idle for low frequencies.
  • a frequency-selective surface is created in a simple manner, which has a low-pass characteristic. That is, the shielding according to the invention ensures good shielding for high frequencies and in particular the MR frequency, whereas low frequencies and in particular the frequency of the MR gradient field are transmitted, thus avoiding the disturbing induction of eddy currents.
  • the substrate used in the shield preferably comprises a dielectric (non-conductive) material.
  • a dielectric (non-conductive) material is a high frequency suitable substrate, e.g. with a largely homogeneous dielectric constant over the desired frequency range.
  • Other possible materials for the substrate are ceramics, e.g. Alumina, polymer, e.g. Teflon, or a glass fiber structure, e.g. FR4, or prepreg.
  • a non-ferromagnetic material is used as metal for the metal structure.
  • Preferred metals for the metal structure are gold, silver, copper or aluminum or combinations of these metals.
  • the meander-shaped boundary line runs at right angles and / or in curves.
  • the metal structure forms a pattern of a plurality of identical structured surface elements, which are configured and arranged next to one another such that the non-contiguous subregions are formed thereby.
  • a fractal structuring is achieved by repetitive surface elements, which can be produced in a simple manner, for example, with known printed circuit board processes.
  • a respective structured surface element is rectangular and particularly preferably square.
  • one or more sections of the boundary line run into the structured surface element at the respective edges of a respective structured surface element, a respective section of the boundary line extending from one position on the corresponding edge to another position of the corresponding edge.
  • the edge is to be understood as a virtual edge, which delimits the individual surface elements from each other. In contrast to the boundary line, this edge is not actually formed in the metal structure.
  • a finger extending into the corresponding edge is formed by a respective section of the boundary line, wherein the fingers are preferably of different lengths at the same edge.
  • a particularly good damping effect is achieved in the shield by arranging a respective metal structure on both sides of the at least one substrate. This results in a capacitive coupling by means of the substrate for overlapping in plan view of the substrate portions.
  • the damping effect can further be improved in that the shield comprises a plurality of superimposed substrates, wherein a respective metal structure is arranged between adjacent sides of at least one pair and in particular of all pairs of adjacent substrates.
  • a respective metal structure is also arranged on the upper side of the uppermost substrate and / or on the underside of the lowermost substrate of the plurality of superimposed substrates.
  • two adjacent metal structures which are separated from each other by a substrate, are configured such that the subregions of the adjacent metal structures are offset from one another in a plan view of the plane of the substrate. As a result, the capacitive coupling between portions of adjacent metal structures can be increased.
  • the metal structure is connected to a mass of an electrical or electronic circuit, in which the first coil is incorporated.
  • the shield is arranged such that it at least partially covers the first coil and thus shields it.
  • Fig. 1 shows a first embodiment of an interferer
  • shielding structure (e.g., in the form of an electronic package) shielding structure;
  • FIG. 2 is an enlarged view of the fractal surface elements shown in FIG. 1; FIG.
  • FIG. 3 shows a second embodiment of a shield
  • Fig. 4 is a perspective view showing the arrangement of the fractal surface elements in the shield of Fig. 3;
  • Fig. 5 is an illustration of an embodiment of the inventive arrangement.
  • Fig. 1 shows a sectional view of a first embodiment of a frequency-selective shielding 1 in the form of a rectangular box, with which an interferer 5 is shielded in the form of an electronic circuit to components outside the shield.
  • an interferer 5 is shielded in the form of an electronic circuit to components outside the shield.
  • the interferer 5 for example, the ferrite of a primary coil or a secondary coil for producing an inductive charging connection of an electric vehicle.
  • an air gap which bridges the inductive charging connection, can be scanned by arbitrary antennas for higher frequencies (MHz GHz range) without the ferrites in the primary or secondary coil influencing them. Furthermore, the energy transfer at the low frequency (kHz range) is not disturbed by this shielding.
  • a shield of metal or a metal coated material In order for the ferrite to be shielded in both the primary and secondary coils for higher frequencies in the MHz GHz range, a shield of metal or a metal coated material must be used. Such a screen plate leads to problems in the transmission of the low-frequency signal, since eddy currents would be induced in the plate, which also lead to a heating of the plate and high power losses.
  • the frequency-selective shielding can be designed to pass (ie, idle) the low frequencies without much interference Frequencies) and acts for the higher frequencies as a metal plate (ie it represents a short circuit). For this purpose, different embodiments will be described below.
  • the frequency-selective shielding 1 comprises a dielectric substrate 2, which consists of a glass fiber composite material and in particular of FR4.
  • a metallic structure 3 is provided, which is formed of a non-ferromagnetic metal (preferably copper).
  • the metal structure is designed such that on the upper side of the substrate 2 non-contiguous portions are formed, which are separated by meandering boundary lines 4 from each other.
  • the borderlines thus represent spacings between adjacent subregions where there is no metal of the metal structure.
  • Fig. 1 also shows a detail view D, which shows a square section of the metal structure 3 in plan view. According to this detail view, dark areas are formed by the corresponding metal of the metal structure, whereas the bright areas are the corresponding boundary lines 4. As can be seen, in the illustrated detail of the detail view four boundary lines run meandering inwardly at each edge of the cutout to a center point P. The structure continues at each edge of the cutout by repeating the illustrated square so that partial regions are formed have a meandering borderline at each edge.
  • the surface of the metal structure 3 can be described based on corresponding fractal surface elements 301, wherein in the detail D is one of the surface elements highlighted by a border in the upper left corner of the square section. Overall, the square section of the metal structure contains four of these surface elements 301. This structure of the surface elements is repeated in the entire surface of the metal structure, wherein the surface elements are always assembled at their edges so that the meandering boundary lines 4 form.
  • Fig. 2 shows an enlarged view again the section of the metal structure of Fig. 1.
  • a single surface element 301 is shown again larger.
  • this surface element is designed square, wherein one of the edges of the square is designated by the reference symbol K.
  • this square may have different sizes.
  • the length of the edge of the square is between 5 mm and 5 cm.
  • the boundary line preferably has a width between 1 mm and 1 cm.
  • a surface element 301 is structured such that on each edge of the surface element a plurality of sections of the meandering boundary line extend into and out of the surface element, whereby five fingers F are formed on each edge (only partially provided with reference numerals).
  • the fingers of adjoining edges of adjacent surface elements are offset from one another in order to thereby form the meandering boundary line.
  • the borderlines 4 ensure that the capacitance between the individual subareas is greatly increased, so that sufficient attenuation for the MHz range and / or the GHz range is ensured without the use of discrete capacitive components between the subregions. It must therefore be provided no additional components for the shield, whereby the assembly cost is significantly reduced. It is also achieved at the same time that the shielding for the derfrequenten fields for inductive energy transmission is permeable.
  • Fig. 3 shows in section a section of a second embodiment of a shield.
  • this shield comprises two superimposed substrates 2, which in turn consist of dielectric material.
  • substrates 2 which in turn consist of dielectric material.
  • corresponding metal structures 3 are formed, the construction of which corresponds to the metal structure 3 from FIG. That is, each of the metal structures is formed of a plurality of portions separated by meander-shaped boundary lines. For reasons of clarity, only some of the boundary lines are designated by reference numeral 4 in FIG.
  • reference numeral 4 for reasons of clarity, only some of the boundary lines are designated by reference numeral 4 in FIG.
  • FIG. 3 not only adjacent subareas within a metal structure are capacitively coupled, but there are also capacitive couplings between subregions of adjacent metal structures spaced above a substrate which overlap one another in plan view of the substrate.
  • the individual metal structures 3 of FIG. 3 are arranged offset to one another, as is apparent from the perspective view of FIG. 4.
  • This figure shows a section of the superimposed three metal structures, wherein the points P 'of the relative positions of the metal structures are illustrated to each other. If the points P 'of different metal structures are superimposed in plan view of the substrate, the metal structures overlap exactly with one another. Otherwise, they are offset from each other.
  • mutually adjacent metal structures are always offset relative to one another, ie the lowermost metal structure is offset relative to the middle metal structure and the middle metal structure is positioned offset to the upper metal structure. The lowermost and the uppermost metal structure are in turn not arranged offset to one another. net. With this staggered positioning of adjacent metal structures, it is possible to achieve a particularly high capacitance between the individual subregions and thus a very good attenuation for high-frequency fields.
  • the embodiments of the shield described above have a number of advantages.
  • the special fractal structuring of the metal structure achieves a shielding effect down to the lower MHz frequency range, without additional capacitive components having to be provided.
  • it ensures that the metallic structure is transparent to low frequencies, thereby avoiding eddy currents in the metal structure.
  • Due to the multi-layer structure of the shielding it can be flexibly adapted for different areas of application. Furthermore, this improves the shielding effect for high frequency frequency components.
  • document WO 2008/051915 A1 shows a suitable frequency-selective shielding of an electronic circuit, in which metal structures are formed on both sides of a substrate, which each comprise non-contiguous subregions with slots located therebetween.
  • suitable frequency-selective shielding which provides a metal structure of a plurality of non-contiguous portions on a substrate, wherein the portions are at least partially capacitively interconnected. This is achieved by the subregions having overlaps on both sides of the substrate and / or by the subregions being connected to one another by means of capacitors.
  • the generated capacity Coupling provides a short circuit for high frequencies and an idling for low frequencies. This results in a frequency-selective surface.
  • a single-layer or multi-layer patch structure is described as the embodiment, with the patches overlapping one another in the case of several layers.
  • a single-layer or multi-layer strip screen is described, with several layers overlapping each other. In both variants, discrete capacitors can be soldered to match the shielding via the slots.
  • FIG. 5 shows an electric vehicle 10 which is equipped with an arrangement for inductive charging.
  • a vehicle-side secondary coil 12 is shielded by a vehicle-side shield 11 against a detection means 15.
  • the counterpart to the inductive charging connection is formed by a stationary primary coil 14, which in turn is shielded by a stationary shield 13 against the detection means 15.
  • the detection means 15 operates, for example, in the GHz range, for example at 76-77 GHz, as a Doppler radar for detecting object movements or as an FMCW radar. It includes a patch antenna or a dipole antenna.
  • the vehicle-side shielding 11 and the stationary shielding 13 here shield the ferrites as interferers in the GHz range within the vehicle-side secondary coil 12 and the stationary primary coil 14. At the same time, owing to their particular properties described in the context of FIGS. 1 to 4, these shieldings allow frequencies in the kHz range, for example 20-100 kHz, which provide the inductive charging connection to pass unhindered.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

L'invention concerne un ensemble permettant de fournir une liaison de charge inductive. L'invention fournit un blindage sélectif en fréquence (1), lequel ne nuit pas aux fréquences dans la bande kHz nécessaires pour la charge inductive, tandis que les fréquences dans la bande MHz ou GHz sont blindées. Ceci permet l'utilisation de procédés de radar pour la surveillance de la liaison de charge inductive et la recherche de corps étrangers. Selon un mode de réalisation, le blindage sélectif en fréquence (1) comprend au moins un substrat (2), une structure métallique (3) étant disposée sur au moins une face du ou des substrats (2). Le blindage sélectif en fréquence (1) de ce mode de réalisation se caractérise par le fait que la structure métallique (3) comporte plusieurs zones non contigües, des zones voisines, lesquelles sont disposées sur la même face du substrat (2), étant espacées les unes des autres par une ligne de séparation (4) s'étendant de façon sinueuse.
PCT/EP2014/069070 2013-10-24 2014-09-08 Ensemble permettant de fournir une liaison de charge inductive WO2015058895A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013221659.9 2013-10-24
DE201310221659 DE102013221659A1 (de) 2013-10-24 2013-10-24 Anordnung zur Bereitstellung einer induktiven Ladeverbindung

Publications (1)

Publication Number Publication Date
WO2015058895A1 true WO2015058895A1 (fr) 2015-04-30

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PCT/EP2014/069070 WO2015058895A1 (fr) 2013-10-24 2014-09-08 Ensemble permettant de fournir une liaison de charge inductive

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WO (1) WO2015058895A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170084991A1 (en) * 2015-09-17 2017-03-23 Qualcomm Incorporated Wireless power transfer antenna having a split shield

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007023343A1 (de) * 2006-05-30 2007-12-06 Sew-Eurodrive Gmbh & Co. Kg Übertragerkopf und Anlage
WO2008051915A1 (fr) 2006-10-26 2008-05-02 Cherik Bulkes Dispositif médical électronique implanté compatible avec une irm avec capacité de puissance et de communication de données
US20080139262A1 (en) * 2006-12-08 2008-06-12 Han-Ni Lin Multiband frequency selective filter
WO2009081115A1 (fr) 2007-12-21 2009-07-02 Amway (Europe) Limited Transfert de puissance inductif
DE202009009689U1 (de) 2009-07-14 2010-11-25 Conductix-Wampfler Ag Vorrichtung zur induktiven Übertragung elektrischer Energie
US20110074346A1 (en) 2009-09-25 2011-03-31 Hall Katherine L Vehicle charger safety system and method
JP2012249490A (ja) * 2011-05-31 2012-12-13 Kojima Press Industry Co Ltd 車両搭載用充電装置および車両用電力供給装置
DE102011084071A1 (de) 2011-10-06 2013-04-11 Siemens Aktiengesellschaft Schirmung für elektronische Schaltung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7737899B1 (en) * 2006-07-13 2010-06-15 Wemtec, Inc. Electrically-thin bandpass radome with isolated inductive grids

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007023343A1 (de) * 2006-05-30 2007-12-06 Sew-Eurodrive Gmbh & Co. Kg Übertragerkopf und Anlage
WO2008051915A1 (fr) 2006-10-26 2008-05-02 Cherik Bulkes Dispositif médical électronique implanté compatible avec une irm avec capacité de puissance et de communication de données
US20080139262A1 (en) * 2006-12-08 2008-06-12 Han-Ni Lin Multiband frequency selective filter
WO2009081115A1 (fr) 2007-12-21 2009-07-02 Amway (Europe) Limited Transfert de puissance inductif
DE202009009689U1 (de) 2009-07-14 2010-11-25 Conductix-Wampfler Ag Vorrichtung zur induktiven Übertragung elektrischer Energie
US20110074346A1 (en) 2009-09-25 2011-03-31 Hall Katherine L Vehicle charger safety system and method
JP2012249490A (ja) * 2011-05-31 2012-12-13 Kojima Press Industry Co Ltd 車両搭載用充電装置および車両用電力供給装置
DE102011084071A1 (de) 2011-10-06 2013-04-11 Siemens Aktiengesellschaft Schirmung für elektronische Schaltung

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