WO2020079061A1 - Method for determining a coil current of a primary coil, control device for a primary coil arrangement, primary coil arrangement - Google Patents

Method for determining a coil current of a primary coil, control device for a primary coil arrangement, primary coil arrangement Download PDF

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Publication number
WO2020079061A1
WO2020079061A1 PCT/EP2019/078055 EP2019078055W WO2020079061A1 WO 2020079061 A1 WO2020079061 A1 WO 2020079061A1 EP 2019078055 W EP2019078055 W EP 2019078055W WO 2020079061 A1 WO2020079061 A1 WO 2020079061A1
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WO
WIPO (PCT)
Prior art keywords
coil
primary coil
sensor
current
induced
Prior art date
Application number
PCT/EP2019/078055
Other languages
German (de)
French (fr)
Inventor
Gabriel Krein
Moritz Braeuchle
Tobias TIPPELT
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Robert Bosch Gmbh
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Publication of WO2020079061A1 publication Critical patent/WO2020079061A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the invention relates to a method for determining a coil current of a primary coil for an energy transmission device having the primary coil and a secondary coil, the primary coil being assigned a sensor coil in such a way that an electrical voltage induces an electrical voltage in the sensor coil by applying an electrical current or an electrical voltage to the primary coil becomes.
  • the invention also relates to a control device for performing the above-mentioned method.
  • the invention further relates to a primary coil arrangement with the above-mentioned control device.
  • inductive charging stations have a primary coil. If an electrical current or an electrical voltage is applied to the primary coil, a coil current is generated in the primary coil and by the coil current
  • a secondary coil for example a secondary coil, which is electrically connected to an energy store of a motor vehicle with an electric drive machine, is now arranged in the magnetic field, an electrical voltage is induced in the secondary coil by the magnetic field, the induced by the Voltage of energy storage can be charged.
  • the primary coil and the secondary coil thus form an energy transmission device.
  • the sensor coil Depending on the voltage induced in the sensor coil, it detects whether there are metallic objects in the energy transmission device, in particular between the primary coil and the secondary coil.
  • the method according to the invention with the features of claim 1 has the advantage that the coil current of the primary coil is determined simply and reliably. Knowing the coil current of the primary coil is advantageous for open-loop and closed-loop control functions and for safety functions when operating the energy transmission device. According to the invention
  • Voltage is determined, in particular calculated, the coil current of the primary coil.
  • the coil current of the primary coil is determined as a function of the at least one voltage value. It is assumed that the voltage induced in the sensor coil with the
  • Coil current of the primary coil correlated.
  • the voltage induced in the sensor coil is proportional to the coil current of the primary coil.
  • the coil current of the primary coil is determined as a function of the voltage induced in the sensor coil also has the advantage that an additional primary coil current sensor can be dispensed with. This results, for example, in cost savings and
  • Coil current of the primary coil depending on a course of the induced Tension is determined. This has the advantage that the accuracy of determining the coil current is increased. For example, a course of the coil current is determined as a function of the course of the induced voltage. In particular, depending on the course of the induced voltage, maximum values, minimum values, amplitudes and / or a mean value of the induced voltage or the coil current of the primary coil are determined. Coil current values determined in this way are advantageous
  • Control and / or regulation of the coil current of the primary coil is particularly suitable.
  • the coil current of the primary coil can thus be calculated directly from the induced voltage using the proportionality factor.
  • a proportionality factor determined in preliminary tests is used as the proportionality factor.
  • the use of such a proportionality factor is particularly advantageous because, for example, in
  • a plurality of sensor coils are assigned to the primary coil in such a way that an electrical voltage is induced in each of the plurality of sensor coils by applying an electrical current or an electrical voltage to the primary coil, and that as a function of those in the plurality Sensor coils induced voltages the coil current of the primary coil is determined.
  • the reliability of the method or the determined coil current is increased.
  • a plurality of sensor coils ensures, for example, that an at least substantially reliable coil current of the primary coil is also determined when the one induced in one of the sensor coils
  • Voltage has an unexpected or incorrect voltage value. This is the case, for example, when the arrangement of one of the sensor coils changes compared to the arrangement of this sensor coil during the determination of the proportionality factor.
  • the coil current of the primary coil is preferably determined as a function of an average value of the voltages induced in the plurality of sensor coils.
  • a procedure advantageously takes into account the voltages induced in the multiple sensor coils. For example, an arithmetic mean is determined as the mean.
  • not all of the voltages induced in the plurality of sensor coils are taken into account when determining the coil current of the primary coil. Accordingly, at least one of the induced voltages is excluded when determining the coil current. That of the induced voltages which has an unexpected voltage value is preferably excluded, so that an unreliable coil current could be determined by taking this voltage value into account when determining the coil current of the primary coil.
  • a is used as the sensor coil
  • the primary coil of an energy transmission device is generally assigned a metal detection device with at least one sensor coil.
  • the provision of additional sensor coils for determining the coil current of the primary coil can be dispensed with. This saves costs and installation space.
  • the control device for a primary coil arrangement, which has a primary coil that can be connected to an alternating current network and at least one sensor coil, which is arranged in such a way that an electrical voltage is induced in the sensor coil by applying an electrical current or an electrical voltage to the primary coil the features of claim 8 by a control unit, specifically for this is prepared to carry out the method according to the invention when used as intended.
  • the primary coil arrangement according to the invention with a primary coil, which can be connected to an AC network, and at least one sensor coil, which is arranged in such a way that an electrical voltage is induced in the sensor coil by the application of an electrical current or an electrical voltage to the primary coil.
  • the primary coil arrangement is preferably designed without a primary coil current sensor.
  • the primary coil arrangement accordingly has no current sensor which is designed to directly detect the coil current of the primary coil. This results in the advantage that costs and installation space are saved which would result from the provision of an additional primary coil current sensor for detecting the coil current of the primary coil.
  • the sensor coil is preferably arranged directly on an end face of the primary coil. This results in a particularly efficient coupling between the primary coil and the sensor coil, so that an electrical voltage can be induced in the sensor coil by applying an electrical current or an electrical voltage to the primary coil.
  • the end face is preferably the side, in particular the upper side, of the primary coil which faces the secondary coil when an electrical voltage is induced in the secondary coil by the magnetic field.
  • the sensor coil is therefore preferably arranged directly above the primary coil.
  • Figure 2 shows an advantageous method for determining a coil current of a primary coil of the energy transmission device.
  • Figure 1 shows a schematic representation of a
  • Energy transmission device 1 has a stationary part 2, which is designed as an inductive charging station 2, and a mobile part 3.
  • the stationary part 2 has a primary coil arrangement 4, the one
  • Primary coil 5 comprises.
  • the primary coil 5 is electrically conductively connected to an alternating current source 8 by a first electrical line 6 and a second electrical line 7.
  • the AC power source 8 is designed to apply an AC power to the primary coil 5.
  • an alternating voltage source is provided which is designed to apply an alternating voltage to the primary coil 5.
  • a first power electronics 9 and a first are between the alternating voltage source 8 and the primary coil 5
  • the mobile part 3 of the energy transmission device 1 has one
  • Secondary coil 13 This is part of a motor vehicle (not shown in FIG. 1) with an electric drive machine and is electrically conductively connected to an energy store 16 of the motor vehicle by a third electrical line 14 and a fourth electrical line 15. There are also one between the energy store 16 and the secondary coil 13
  • Compensation network ie a second compensation network 18, switched.
  • the motor vehicle or the secondary coil is present 13 arranged such that a voltage is induced in the secondary coil 13 by the magnetic field 11, so that the energy store 16 can be charged by the voltage induced in the secondary coil 13.
  • the primary coil arrangement 4 has at least one, in the present case four, sensor coils 12.
  • the sensor coils 12 are arranged such that an electrical voltage is induced in each of the sensor coils 12 by the magnetic field 11.
  • the sensor coils 12 are preferably arranged directly on an end face of the primary coil 5.
  • the end face is the side, in particular the upper side, of the primary coil which, according to FIG. 1, faces the secondary coil 13.
  • Sensor coils 12 arranged in this way are used according to the prior art to detect whether there are metallic objects in an intermediate space 19 between the primary coil 5 and the secondary coil 13.
  • the coil current of the primary coil 5 can be determined as a function of the voltages induced in the sensor coils 12.
  • the stationary part 2 has a control device 20 which is connected to each of the sensor coils 12 and is designed to detect the voltages induced in the sensor coils 12 and to determine the coil current of the primary coil 5 as a function of the detected induced voltages.
  • a step S1 an alternating current or an alternating voltage is applied to the primary coil 5. This is achieved by a suitable control of the first power electronics 9 and the first compensation network 10. By the alternating current or the applied
  • step S1 an electrical voltage is also applied to the magnetic field 11 Secondary coil 13 induced, so that the energy store 16 can be charged, namely when the mobile part 3 or the secondary coil 13 are suitably arranged in the magnetic field 11.
  • the voltages induced in the sensor coils 12 are detected by the control device 20.
  • the control unit 20 detects a course of the voltages induced in the sensor coils 12.
  • the control unit 20 determines the coil current of the primary coil 5 as a function of the detected voltages induced in the sensor coils 12. For example, the coil current is determined by the
  • Control unit 20 is calculated from the voltages induced in the sensor coils 12. Because of the above-described relationship between the voltages induced in the sensor coils 12 and the coil current of the primary coil 5, this is easily possible using a proportionality factor determined in preliminary tests. In particular, a proportionality factor is provided for each of the sensor coils 12, which is used in the calculation of the coil current. In the present case, the control unit 20 calculates a preliminary coil current of the primary coil 5 as a function of each of the voltages induced in the sensor coils 12. The coil current of the primary coil 5 is then an average of the preliminary ones

Abstract

The invention relates to a method for determining a coil current of a primary coil for an energy transmission device having the primary coil and a secondary coil, wherein a sensor coil is assigned to the primary coil in such a manner that an electrical voltage is induced in the sensor coil by applying an electrical current or an electrical voltage to the primary coil. Provision is made for the coil current of the primary coil to be determined on the basis of the voltage induced in the sensor coil.

Description

Beschreibung  description
Titel title
Verfahren zum Ermiteln eines Spulenstroms einer Primärspule, Steuergerät für eine Primärspulenanordnung, Primärspulenanordnung  Method for determining a coil current of a primary coil, control device for a primary coil arrangement, primary coil arrangement
Die Erfindung betrifft ein Verfahren zum Ermitteln eines Spulenstroms einer Primärspule für eine die Primärspule und eine Sekundärspule aufweisende Energieübertragungseinrichtung, wobei der Primärspule eine Sensorspule derart zugeordnet wird, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule eine elektrische Spannung in die Sensorspule induziert wird. The invention relates to a method for determining a coil current of a primary coil for an energy transmission device having the primary coil and a secondary coil, the primary coil being assigned a sensor coil in such a way that an electrical voltage induces an electrical voltage in the sensor coil by applying an electrical current or an electrical voltage to the primary coil becomes.
Außerdem betrifft die Erfindung ein Steuergerät zum Durchführen des oben genannten Verfahrens. The invention also relates to a control device for performing the above-mentioned method.
Ferner betrifft die Erfindung eine Primärspulenanordnung mit dem oben genannten Steuergerät. The invention further relates to a primary coil arrangement with the above-mentioned control device.
Stand der Technik State of the art
Energieübertragungseinrichtungen der eingangs genannten Art sind bekannt. Beispielsweise weisen induktive Ladestationen eine Primärspule auf. Wird an die Primärspule ein elektrischer Strom oder eine elektrische Spannung angelegt, so wird in der Primärspule ein Spulenstrom und durch den Spulenstrom Energy transmission devices of the type mentioned are known. For example, inductive charging stations have a primary coil. If an electrical current or an electrical voltage is applied to the primary coil, a coil current is generated in the primary coil and by the coil current
beziehungsweise durch die Primärspule ein Magnetfeld erzeugt. Wird nun eine Sekundärspule, beispielsweise eine Sekundärspule, die elektrisch mit einem Energiespeicher eines Kraftfahrzeugs mit einer elektrischen Antriebsmaschine verbunden ist, in dem Magnetfeld angeordnet, wird durch das Magnetfeld eine elektrische Spannung in die Sekundärspule induziert, wobei durch die induzierte Spannung der Energiespeicher aufgeladen werden kann. Somit bilden die Primärspule und die Sekundärspule eine Energieübertragungseinrichtung. or generated by the primary coil a magnetic field. If a secondary coil, for example a secondary coil, which is electrically connected to an energy store of a motor vehicle with an electric drive machine, is now arranged in the magnetic field, an electrical voltage is induced in the secondary coil by the magnetic field, the induced by the Voltage of energy storage can be charged. The primary coil and the secondary coil thus form an energy transmission device.
Um das Vorhandensein metallischer Gegenstände in einer derartigen To the presence of metallic objects in such
Energieübertragungseinrichtung zu überwachen, ist es außerdem bekannt, der Primärspule eine Sensorspule derart zuzuordnen, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule eine elektrische Spannung in die Sensorspule induziert wird. Dabei wird in To monitor the energy transmission device, it is also known to assign a sensor coil to the primary coil in such a way that an electrical voltage is induced in the sensor coil by applying an electrical current or an electrical voltage to the primary coil. Thereby in
Abhängigkeit von der in die Sensorspule induzierten Spannung erfasst, ob sich metallische Gegenstände in der Energieübertragungseinrichtung, insbesondere zwischen der Primärspule und der Sekundärspule, befinden. Depending on the voltage induced in the sensor coil, it detects whether there are metallic objects in the energy transmission device, in particular between the primary coil and the secondary coil.
Offenbarung der Erfindung Disclosure of the invention
Das erfindungsgemäße Verfahren mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass der Spulenstrom der Primärspule einfach und zuverlässig ermittelt wird. Die Kenntnis des Spulenstroms der Primärspule ist für Steuerungs- und Regelungsfunktionen, sowie für Sicherheitsfunktionen beim Betreiben der Energieübertragungseinrichtung vorteilhaft. Erfindungsgemäß ist dazu The method according to the invention with the features of claim 1 has the advantage that the coil current of the primary coil is determined simply and reliably. Knowing the coil current of the primary coil is advantageous for open-loop and closed-loop control functions and for safety functions when operating the energy transmission device. According to the invention
vorgesehen, dass in Abhängigkeit von der in die Sensorspule induzierten provided that depending on the induced in the sensor coil
Spannung der Spulenstrom der Primärspule ermittelt, insbesondere berechnet, wird. Hierzu wird zumindest ein Spannungswert der in die Sensorspule induzierten Spannung erfasst und in Abhängigkeit von dem zumindest einen Spannungswert der Spulenstrom der Primärspule ermittelt. Dabei wird davon ausgegangen, dass die in die Sensorspule induzierte Spannung mit dem Voltage is determined, in particular calculated, the coil current of the primary coil. For this purpose, at least one voltage value of the voltage induced in the sensor coil is detected and the coil current of the primary coil is determined as a function of the at least one voltage value. It is assumed that the voltage induced in the sensor coil with the
Spulenstrom der Primärspule korreliert. Insbesondere ist die in die Sensorspule induzierte Spannung proportional zu dem Spulenstrom der Primärspule. Coil current of the primary coil correlated. In particular, the voltage induced in the sensor coil is proportional to the coil current of the primary coil.
Dadurch, dass der Spulenstrom der Primärspule in Abhängigkeit von der in die Sensorspule induzierten Spannung ermittelt wird, ergibt sich weiterhin der Vorteil, dass auf einen zusätzlichen Primärspulenstromsensor verzichtet werden kann. Daraus resultieren beispielsweise Kosteneinsparungen und  The fact that the coil current of the primary coil is determined as a function of the voltage induced in the sensor coil also has the advantage that an additional primary coil current sensor can be dispensed with. This results, for example, in cost savings and
Bauraumeinsparungen. Space savings.
Gemäß einer bevorzugten Ausführungsform ist vorgesehen, dass der According to a preferred embodiment it is provided that the
Spulenstrom der Primärspule in Abhängigkeit von einem Verlauf der induzierten Spannung ermitelt wird. Daraus ergibt sich der Vorteil, dass, die Genauigkeit des Ermitelns des Spulenstroms gesteigert wird. Beispielsweise wird in Abhängigkeit von dem Verlauf der induzierten Spannung ein Verlauf des Spulenstroms ermitelt. Insbesondere werden in Abhängigkeit von dem Verlauf der induzierten Spannung Maximalwerte, Minimalwerte, Amplituden und/oder ein Mitelwert der induzierten Spannung beziehungsweise des Spulenstroms der Primärspule ermitelt. Derartig ermitelte Spulenstromwerte sind für eine vorteilhafte Coil current of the primary coil depending on a course of the induced Tension is determined. This has the advantage that the accuracy of determining the coil current is increased. For example, a course of the coil current is determined as a function of the course of the induced voltage. In particular, depending on the course of the induced voltage, maximum values, minimum values, amplitudes and / or a mean value of the induced voltage or the coil current of the primary coil are determined. Coil current values determined in this way are advantageous
Steuerung und/oder Regelung des Spulenstroms der Primärspule besonders geeignet. Control and / or regulation of the coil current of the primary coil is particularly suitable.
Gemäß einer bevorzugten Ausführungsform ist vorgesehen, dass bei der Ermitlung beziehungsweise Berechnung ein Proportionalitätsfaktor According to a preferred embodiment it is provided that a proportionality factor is used in the determination or calculation
berücksichtigt wird. Daraus ergibt sich ein besonders einfaches Vorgehen bei der Berechnung des Spulenstroms der Primärspule. Es wird davon ausgegangen, dass der Spulenstrom der Primärspule zumindest in bestimmten is taken into account. This results in a particularly simple procedure when calculating the coil current of the primary coil. It is assumed that the coil current of the primary coil at least in certain
Strombetragsbereichen des Spulenstroms der Primärspule zumindest im Current amount ranges of the coil current of the primary coil at least in
Wesentlichen proportional zu der in die Sensorspule induzierten Spannung ist. Somit kann der Spulenstrom der Primärspule direkt unter Verwendung des Proportionalitätsfaktors aus der induzierten Spannung berechnet werden. Is essentially proportional to the voltage induced in the sensor coil. The coil current of the primary coil can thus be calculated directly from the induced voltage using the proportionality factor.
Vorzugsweise wird dabei als Proportionalitätsfaktor ein in Vorversuchen ermitelter Proportionalitätsfaktor verwendet. Die Verwendung eines derartigen Proportionalitätsfaktors ist besonders vorteilhaft, weil beispielsweise in Preferably, a proportionality factor determined in preliminary tests is used as the proportionality factor. The use of such a proportionality factor is particularly advantageous because, for example, in
Abhängigkeit von einer Beschaffenheit der Sensorspule und/oder einer Depending on the nature of the sensor coil and / or
Anordnung der Sensorspule unterschiedliche Proportionalitätsfaktoren ein korrektes Ermiteln des Spulenstroms der Primärspule gewährleisten. Arrangement of the sensor coil different proportionality factors ensure correct determination of the coil current of the primary coil.
Gemäß einer bevorzugten Ausführungsform ist vorgesehen, dass mehrere Sensorspulen der Primärspule derart zugeordnet werden, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule jeweils eine elektrische Spannung in jede der mehreren Sensorspulen induziert wird, und dass in Abhängigkeit von den in die mehreren Sensorspulen induzierten Spannungen der Spulenstrom der Primärspule ermitelt wird. Durch das Verwenden mehrerer Sensorspulen wird dabei die Zuverlässigkeit des Verfahrens beziehungsweise des ermitelten Spulenstroms gesteigert. Durch das Verwenden mehrerer Sensorspulen wird beispielsweise gewährleistet, dass auch dann noch ein zumindest im Wesentlichen zuverlässiger Spulenstrom der Primärspule ermittelt wird, wenn die in eine der Sensorspulen induzierte According to a preferred embodiment, it is provided that a plurality of sensor coils are assigned to the primary coil in such a way that an electrical voltage is induced in each of the plurality of sensor coils by applying an electrical current or an electrical voltage to the primary coil, and that as a function of those in the plurality Sensor coils induced voltages the coil current of the primary coil is determined. By using several sensor coils, the reliability of the method or the determined coil current is increased. By the Using a plurality of sensor coils ensures, for example, that an at least substantially reliable coil current of the primary coil is also determined when the one induced in one of the sensor coils
Spannung einen unerwarteten beziehungsweise falschen Spannungswert aufweist. Dies ist beispielsweise dann der Fall, wenn sich die Anordnung einer der Sensorspulen verändert, verglichen mit der Anordnung dieser Sensorspule während des Ermittelns des Proportionalitätsfaktors. Voltage has an unexpected or incorrect voltage value. This is the case, for example, when the arrangement of one of the sensor coils changes compared to the arrangement of this sensor coil during the determination of the proportionality factor.
Vorzugsweise wird der Spulenstrom der Primärspule in Abhängigkeit von einem Mittelwert der in die mehreren Sensorspulen induzierten Spannungen ermittelt. Durch eine derartige Vorgehensweise werden die in die mehreren Sensorspulen induzierten Spannungen vorteilhaft berücksichtigt. Als Mittelwert wird dabei beispielsweise ein arithmetisches Mittel ermittelt. Insbesondere werden nicht alle der in die mehreren Sensorspulen induzierten Spannungen beim Ermitteln des Spulenstroms der Primärspule berücksichtigt. Demnach wird zumindest eine der induzierten Spannungen beim Ermitteln des Spulenstroms ausgeschlossen. Vorzugsweise wird diejenige der induzierten Spannungen ausgeschlossen, die einen unerwarteten Spannungswert aufweist, sodass durch das Berücksichtigen dieses Spannungswertes beim Ermitteln des Spulenstroms der Primärspule ein unzuverlässiger Spulenstrom ermittelt werden könnte. The coil current of the primary coil is preferably determined as a function of an average value of the voltages induced in the plurality of sensor coils. Such a procedure advantageously takes into account the voltages induced in the multiple sensor coils. For example, an arithmetic mean is determined as the mean. In particular, not all of the voltages induced in the plurality of sensor coils are taken into account when determining the coil current of the primary coil. Accordingly, at least one of the induced voltages is excluded when determining the coil current. That of the induced voltages which has an unexpected voltage value is preferably excluded, so that an unreliable coil current could be determined by taking this voltage value into account when determining the coil current of the primary coil.
Gemäß einer bevorzugten Ausführungsform wird als Sensorspule eine According to a preferred embodiment, a is used as the sensor coil
Sensorspule einer Metalldetektionseinrichtung verwendet. Wie bereits beschrieben, ist der Primärspule einer Energieübertragungseinrichtung in der Regel ohnehin eine Metalldetektionseinrichtung mit zumindest einer Sensorspule zugeordnet. Durch Verwenden dieser Sensorspule kann auf das Vorsehen zusätzlicher Sensorspulen für das Ermitteln des Spulenstroms der Primärspule verzichtet werden. Hierdurch werden Kosten und Bauraum eingespart. Sensor coil of a metal detection device used. As already described, the primary coil of an energy transmission device is generally assigned a metal detection device with at least one sensor coil. By using this sensor coil, the provision of additional sensor coils for determining the coil current of the primary coil can be dispensed with. This saves costs and installation space.
Das erfindungsgemäße Steuergerät für eine Primärspulenanordnung, die eine mit einem Wechselstromnetz verbindbare Primärspule und zumindest eine Sensorspule aufweist, die derart angeordnet ist, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule eine elektrische Spannung in die Sensorspule induziert wird, zeichnet sich mit den Merkmalen des Anspruchs 8 durch ein Steuergerät aus, das speziell dazu hergerichtet ist, bei bestimmungsgemäßem Gebrauch das erfindungsgemäße Verfahren durchzuführen. Es ergeben sich daraus die bereits genannten Vorteile. Weitere bevorzugte Merkmale und Merkmalskombinationen ergeben sich aus dem zuvor Beschriebenen sowie aus den Ansprüchen. The control device according to the invention for a primary coil arrangement, which has a primary coil that can be connected to an alternating current network and at least one sensor coil, which is arranged in such a way that an electrical voltage is induced in the sensor coil by applying an electrical current or an electrical voltage to the primary coil the features of claim 8 by a control unit, specifically for this is prepared to carry out the method according to the invention when used as intended. This results in the advantages already mentioned. Further preferred features and combinations of features result from what has been described above and from the claims.
Die erfindungsgemäße Primärspulenanordnung mit einer Primärspule, die mit einem Wechselstromnetz verbindbar ist, und zumindest einer Sensorspule, die derart angeordnet ist, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule eine elektrische Spannung in die Sensorspule induziert wird, zeichnet sich mit den Merkmalen des Anspruchs 9 durch das erfindungsgemäße Steuergerät aus. Auch daraus ergeben sich die bereits genannten Vorteile. The primary coil arrangement according to the invention with a primary coil, which can be connected to an AC network, and at least one sensor coil, which is arranged in such a way that an electrical voltage is induced in the sensor coil by the application of an electrical current or an electrical voltage to the primary coil Features of claim 9 by the control device according to the invention. The advantages already mentioned also result from this.
Vorzugsweise ist die Primärspulenanordnung primärspulenstromsensorfrei ausgebildet. Die Primärspulenanordnung weist demnach keinen Stromsensor auf, der dazu ausgebildet ist, direkt den Spulenstrom der Primärspule zu erfassen. Daraus ergibt sich der Vorteil, dass Kosten und Bauraum eingespart werden, die durch das Vorsehen eines zusätzlichen Primärspulenstromsensors zum Erfassen des Spulenstroms der Primärspule entstehen würden. The primary coil arrangement is preferably designed without a primary coil current sensor. The primary coil arrangement accordingly has no current sensor which is designed to directly detect the coil current of the primary coil. This results in the advantage that costs and installation space are saved which would result from the provision of an additional primary coil current sensor for detecting the coil current of the primary coil.
Vorzugsweise ist die Sensorspule direkt auf einer Stirnseite der Primärspule angeordnet. Daraus ergibt sich eine besonders effiziente Kopplung zwischen der Primärspule und der Sensorspule, sodass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule eine elektrische Spannung in die Sensorspule induziert werden kann. Vorzugsweise handelt es sich bei der Stirnseite um die Seite, insbesondere Oberseite der Primärspule, die der Sekundärspule zugewandt ist, wenn durch das Magnetfeld eine elektrische Spannung in die Sekundärspule induziert wird. Die Sensorspule ist demnach vorzugsweise direkt über der Primärspule angeordnet. The sensor coil is preferably arranged directly on an end face of the primary coil. This results in a particularly efficient coupling between the primary coil and the sensor coil, so that an electrical voltage can be induced in the sensor coil by applying an electrical current or an electrical voltage to the primary coil. The end face is preferably the side, in particular the upper side, of the primary coil which faces the secondary coil when an electrical voltage is induced in the secondary coil by the magnetic field. The sensor coil is therefore preferably arranged directly above the primary coil.
Im Folgenden wird die Erfindung anhand der Zeichnungen näher erläutert, wobei gleiche und entsprechende Elemente mit den gleichen Bezugszeichen versehen sind. Dazu zeigen Figur 1 eine Energieübertragungseinrichtung in einer schematischenThe invention is explained in more detail below with reference to the drawings, the same and corresponding elements being provided with the same reference symbols. Show this Figure 1 shows an energy transmission device in a schematic
Darstellung, Presentation,
Figur 2 ein vorteilhaftes Verfahren zum Ermitteln eines Spulenstroms einer Primärspule der Energieübertragungseinrichtung. Figure 2 shows an advantageous method for determining a coil current of a primary coil of the energy transmission device.
Figur 1 zeigt in einer schematischen Darstellung eine Figure 1 shows a schematic representation of a
Energieübertragungseinrichtung 1 in einer Seitenansicht. Die Energy transmission device 1 in a side view. The
Energieübertragungseinrichtung 1 weist einen stationären Teil 2, der als induktive Ladestation 2 ausgebildet ist, und einen mobilen Teil 3 auf. Energy transmission device 1 has a stationary part 2, which is designed as an inductive charging station 2, and a mobile part 3.
Der stationäre Teil 2 weist eine Primärspulenanordnung 4 auf, die eine The stationary part 2 has a primary coil arrangement 4, the one
Primärspule 5 umfasst. Die Primärspule 5 ist durch eine erste elektrische Leitung 6 und eine zweite elektrische Leitung 7 mit einer Wechselstromquelle 8 elektrisch leitend verbunden. Die Wechselstromquelle 8 ist dazu ausgebildet, einen Wechselstrom an der Primärspule 5 anzulegen. Alternativ zu der in Figur 1 dargestellten Wechselstromquelle 8 ist eine Wechselspannungsquelle vorgesehen, die dazu ausgebildet ist, eine Wechselspannung an der Primärspule 5 anzulegen. Um eine Regelung des Wechselstroms beziehungsweise der Wechselspannung zu ermöglichen, sind zwischen der Wechselspannungsquelle 8 und der Primärspule 5 eine erste Leistungselektronik 9 und ein erstes Primary coil 5 comprises. The primary coil 5 is electrically conductively connected to an alternating current source 8 by a first electrical line 6 and a second electrical line 7. The AC power source 8 is designed to apply an AC power to the primary coil 5. As an alternative to the alternating current source 8 shown in FIG. 1, an alternating voltage source is provided which is designed to apply an alternating voltage to the primary coil 5. In order to enable regulation of the alternating current or alternating voltage, a first power electronics 9 and a first are between the alternating voltage source 8 and the primary coil 5
Kompensationsnetzwerk 10 geschaltet. Beim Anlegen eines Wechselstroms beziehungsweise einer Wechselspannung an der Primärspule 5 wird ein Compensation network 10 switched. When an alternating current or an alternating voltage is applied to the primary coil 5, a
Spulenstrom der Primärspule 5 und durch den Spulenstrom beziehungsweise durch die Primärspule 5 ein Magnetfeld 11 erzeugt. Coil current of the primary coil 5 and a magnetic field 11 generated by the coil current or by the primary coil 5.
Der mobile Teil 3 der Energieübertragungseinrichtung 1 weist eine The mobile part 3 of the energy transmission device 1 has one
Sekundärspule 13 auf. Diese ist Bestandteil eines in Figur 1 nicht dargestellten Kraftfahrzeugs mit einer elektrischen Antriebsmaschine und durch eine dritte elektrische Leitung 14 und eine vierte elektrische Leitung 15 elektrisch leitend mit einem Energiespeicher 16 des Kraftfahrzeugs verbunden. Dabei sind auch zwischen dem Energiespeicher 16 und der Sekundärspule 13 eine Secondary coil 13. This is part of a motor vehicle (not shown in FIG. 1) with an electric drive machine and is electrically conductively connected to an energy store 16 of the motor vehicle by a third electrical line 14 and a fourth electrical line 15. There are also one between the energy store 16 and the secondary coil 13
Leistungselektronik, also eine zweite Leistungselektronik 17, und ein Power electronics, so a second power electronics 17, and one
Kompensationsnetzwerk, also ein zweites Kompensationsnetzwerk 18, geschaltet. Vorliegend ist das Kraftfahrzeug beziehungsweise die Sekundärspule 13 derart angeordnet, dass durch das Magnetfeld 11 eine Spannung in die Sekundärspule 13 induziert wird, sodass der Energiespeicher 16 durch die in die Sekundärspule 13 induzierte Spannung aufgeladen werden kann. Compensation network, ie a second compensation network 18, switched. The motor vehicle or the secondary coil is present 13 arranged such that a voltage is induced in the secondary coil 13 by the magnetic field 11, so that the energy store 16 can be charged by the voltage induced in the secondary coil 13.
Zusätzlich zu der Primärspule 5 weist die Primärspulenanordnung 4 zumindest eine, vorliegend vier, Sensorspulen 12 auf. Die Sensorspulen 12 sind derart angeordnet, dass durch das Magnetfeld 11 eine elektrische Spannung in jede der Sensorspulen 12 induziert wird. Vorzugsweise sind die Sensorspulen 12 hierzu direkt auf einer Stirnseite der Primärspule 5 angeordnet. Bei der Stirnseite handelt es sich um die Seite, insbesondere Oberseite, der Primärspule, die gemäß Figur 1 der Sekundärspule 13 zugewandt ist. Derartig angeordnete Sensorspulen 12 werden gemäß dem Stand der Technik verwendet, um zu erfassen, ob sich in einem Zwischenraum 19 zwischen der Primärspule 5 und der Sekundärspule 13 metallische Gegenstände befinden. In addition to the primary coil 5, the primary coil arrangement 4 has at least one, in the present case four, sensor coils 12. The sensor coils 12 are arranged such that an electrical voltage is induced in each of the sensor coils 12 by the magnetic field 11. For this purpose, the sensor coils 12 are preferably arranged directly on an end face of the primary coil 5. The end face is the side, in particular the upper side, of the primary coil which, according to FIG. 1, faces the secondary coil 13. Sensor coils 12 arranged in this way are used according to the prior art to detect whether there are metallic objects in an intermediate space 19 between the primary coil 5 and the secondary coil 13.
Gemäß der in Figur 1 dargestellten Energieübertragungseinrichtung 1 kann in Abhängigkeit von den in die Sensorspulen 12 induzierten Spannungen der Spulenstrom der Primärspule 5 ermittelt werden. Hierzu weist der stationäre Teil 2 ein Steuergerät 20 auf, das mit jeder der Sensorspulen 12 verbunden und dazu ausgebildet ist, die in die Sensorspulen 12 induzierten Spannungen zu erfassen und in Abhängigkeit von den erfassten induzierten Spannungen den Spulenstrom der Primärspule 5 zu ermitteln. According to the energy transmission device 1 shown in FIG. 1, the coil current of the primary coil 5 can be determined as a function of the voltages induced in the sensor coils 12. For this purpose, the stationary part 2 has a control device 20 which is connected to each of the sensor coils 12 and is designed to detect the voltages induced in the sensor coils 12 and to determine the coil current of the primary coil 5 as a function of the detected induced voltages.
Im Folgenden wird mit Bezug auf Figur 2 ein vorteilhaftes Verfahren zum In the following, an advantageous method for
Ermitteln des Spulenstroms der Primärspule 5 anhand eines Flussdiagramms erläutert. Determining the coil current of the primary coil 5 explained using a flow chart.
In einem Schritt S1 wird ein Wechselstrom oder eine Wechselspannung an der Primärspule 5 angelegt. Dies wird durch eine geeignete Ansteuerung der ersten Leistungselektronik 9 und des ersten Kompensationsnetzwerkes 10 erreicht. Durch den angelegten Wechselstrom beziehungsweise die angelegte In a step S1, an alternating current or an alternating voltage is applied to the primary coil 5. This is achieved by a suitable control of the first power electronics 9 and the first compensation network 10. By the alternating current or the applied
Wechselspannung werden ein Spulenstrom in der Primärspule 5 und dadurch das Magnetfeld 11 erzeugt. Durch das Magnetfeld 11 wird weiterhin in jede der Sensorspulen 12 eine elektrische Spannung induziert. Insbesondere wird in dem Schritt S1 durch das Magnetfeld 11 auch eine elektrische Spannung in die Sekundärspule 13 induziert, sodass der Energiespeicher 16 geladen werden kann, nämlich dann, wenn der mobile Teil 3 beziehungsweise die Sekundärspule 13 geeignet in dem Magnetfeld 11 angeordnet sind. AC voltage, a coil current is generated in the primary coil 5 and thereby the magnetic field 11. An electric voltage is further induced in each of the sensor coils 12 by the magnetic field 11. In particular, in step S1 an electrical voltage is also applied to the magnetic field 11 Secondary coil 13 induced, so that the energy store 16 can be charged, namely when the mobile part 3 or the secondary coil 13 are suitably arranged in the magnetic field 11.
In einem Schritt S2 werden die in die Sensorspulen 12 induzierten Spannungen durch das Steuergerät 20 erfasst. Beispielsweise erfasst das Steuergerät 20 hierzu jeweils einen Verlauf der in die Sensorspulen 12 induzierten Spannungen. In a step S2, the voltages induced in the sensor coils 12 are detected by the control device 20. For example, the control unit 20 detects a course of the voltages induced in the sensor coils 12.
In einem Schritt S3 ermittelt das Steuergerät 20 in Abhängigkeit von den erfassten in die Sensorspulen 12 induzierten Spannungen den Spulenstrom der Primärspule 5. Beispielsweise wird der Spulenstrom hierzu durch das In a step S3, the control unit 20 determines the coil current of the primary coil 5 as a function of the detected voltages induced in the sensor coils 12. For example, the coil current is determined by the
Steuergerät 20 aus den in die Sensorspulen 12 induzierten Spannungen berechnet. Aufgrund des oben beschriebenen Zusammenhangs zwischen den in die Sensorspulen 12 induzierten Spannungen und dem Spulenstrom der Primärspule 5 ist dies einfach unter Verwendung eines in Vorversuchen ermittelten Proportionalitätsfaktors möglich. Insbesondere ist für jede der Sensorspulen 12 jeweils ein Proportionalitätsfaktor vorgesehen, der bei der Berechnung des Spulenstroms verwendet wird. Vorliegend berechnet das Steuergerät 20 in Abhängigkeit von jeder der in die Sensorspulen 12 induzierten Spannungen jeweils einen vorläufigen Spulenstrom der Primärspule 5. Als Spulenstrom der Primärspule 5 wird dann ein Mittelwert der vorläufigen Control unit 20 is calculated from the voltages induced in the sensor coils 12. Because of the above-described relationship between the voltages induced in the sensor coils 12 and the coil current of the primary coil 5, this is easily possible using a proportionality factor determined in preliminary tests. In particular, a proportionality factor is provided for each of the sensor coils 12, which is used in the calculation of the coil current. In the present case, the control unit 20 calculates a preliminary coil current of the primary coil 5 as a function of each of the voltages induced in the sensor coils 12. The coil current of the primary coil 5 is then an average of the preliminary ones
Spulenströme berechnet. Coil currents calculated.
Durch das Ermitteln des Spulenstroms der Primärspule 5 in Abhängigkeit von den in die Sensorspulen 12 induzierten elektrischen Spannungen kann auf das Vorsehen eines Primärspulenstromsensors, der ansonsten beispielsweise in der ersten elektrischen Leitung 6 oder der zweiten elektrischen Leitung 7, insbesondere zwischen der Primärspule 5 und dem Kompensationsnetzwerk 10, angeordnet ist, verzichtet werden. Somit ist die in Figur 1 dargestellte By determining the coil current of the primary coil 5 as a function of the electrical voltages induced in the sensor coils 12, it is possible to provide a primary coil current sensor, which is otherwise, for example, in the first electrical line 6 or the second electrical line 7, in particular between the primary coil 5 and the compensation network 10, is arranged to be dispensed with. Thus, the one shown in Figure 1
Energieübertragungseinrichtung 1, beziehungsweise der stationäre Teil 2 der Energieübertragungseinrichtung 1, primärspulenstromsensorfrei ausgebildet. Hierdurch werden Kosten und Bauraum eingespart. Energy transmission device 1, or the stationary part 2 of the energy transmission device 1, designed without primary coil current sensors. This saves costs and installation space.

Claims

Ansprüche Expectations
1. Verfahren zum Ermiteln eines Spulenstroms einer Primärspule (5) für eine die Primärspule (5) und eine Sekundärspule (13) aufweisende 1. A method for determining a coil current of a primary coil (5) for a primary coil (5) and a secondary coil (13)
Energieübertragungseinrichtung (1), wobei der Primärspule (5) eine Sensorspule (12) derart zugeordnet wird, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule (5) eine elektrische Spannung in die Sensorspule (12) induziert wird, dadurch gekennzeichnet, dass in Energy transmission device (1), wherein the primary coil (5) is assigned a sensor coil (12) such that an electrical voltage is induced in the sensor coil (12) by applying an electrical current or an electrical voltage to the primary coil (5) that in
Abhängigkeit von der in die Sensorspule (12) induzierten Spannung der Dependence on the voltage induced in the sensor coil (12)
Spulenstrom der Primärspule (5) ermitelt wird. Coil current of the primary coil (5) is determined.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Spulenstrom der Primärspule (5) in Abhängigkeit von einem Verlauf der in die Sensorspule (12) induzierten Spannung ermitelt wird. 2. The method according to claim 1, characterized in that the coil current of the primary coil (5) is determined as a function of a profile of the voltage induced in the sensor coil (12).
3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei der Ermitlung ein Proportionalitätsfaktor 3. The method according to any one of the preceding claims, characterized in that a proportionality factor in the determination
berücksichtigt wird. is taken into account.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass als Proportionalitätsfaktor ein in Vorversuchen ermitelter Proportionalitätsfaktor verwendet wird. 4. The method according to claim 3, characterized in that a proportionality factor determined in preliminary tests is used as the proportionality factor.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mehrere Sensorspulen (12) der Primärspule (5) derart zugeordnet werden, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule (5) jeweils eine elektrische Spannung in jede der mehreren Sensorspulen (12) induziert wird, und dass in Abhängigkeit von den in die mehreren Sensorspulen (12) induzierten Spannungen der Spulenstrom der Primärspule (5) ermitelt wird. 5. The method according to any one of the preceding claims, characterized in that a plurality of sensor coils (12) are assigned to the primary coil (5) in such a way that, by applying an electrical current or an electrical voltage to the primary coil (5), an electrical voltage in each of the several sensor coils (12) is induced, and that the coil current of the primary coil (5) is determined as a function of the voltages induced in the several sensor coils (12).
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass der Spulenstrom der Primärspule (5) in Abhängigkeit von einem Mittelwert der in die mehreren Sensorspulen (12) induzierten Spannungen ermittelt wird. 6. The method according to claim 5, characterized in that the coil current of the primary coil (5) is determined as a function of an average of the voltages induced in the plurality of sensor coils (12).
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass als Sensorspule (12) eine Sensorspule (12) einer Metalldetektionseinrichtung verwendet wird. 7. The method according to any one of the preceding claims, characterized in that a sensor coil (12) of a metal detection device is used as the sensor coil (12).
8. Steuergerät (20) für eine Primärspulenanordnung (4), wobei die 8. Control device (20) for a primary coil arrangement (4), the
Primärspulenanordnung (4) eine Primärspule (5), die mit einem Primary coil arrangement (4) a primary coil (5) with a
Wechselstromnetz verbindbar ist, und zumindest eine Sensorspule (12) aufweist, die derart angeordnet ist, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule (5) eine elektrische Spannung in die Sensorspule (12) induziert wird, dadurch gekennzeichnet, dass das AC network can be connected, and has at least one sensor coil (12) which is arranged such that an electrical voltage is induced in the sensor coil (12) by applying an electrical current or an electrical voltage to the primary coil (5), characterized in that the
Steuergerät (20) speziell dazu hergerichtet ist, bei bestimmungsgemäßem Gebrauch das Verfahren gemäß einem der Ansprüche 1 bis 7 durchzuführen. Control device (20) is specially designed to carry out the method according to one of claims 1 to 7 when used as intended.
9. Primärspulenanordnung (4), insbesondere einer induktiven Ladestation (2), mit einer Primärspule (5), die mit einem Wechselstromnetz verbindbar ist, und zumindest einer Sensorspule (12), die derart angeordnet ist, dass durch Anlegen eines elektrischen Stroms oder einer elektrischen Spannung an der Primärspule (5) eine elektrische Spannung in die Sensorspule (12) induziert wird, gekennzeichnet durch das Steuergerät (20) gemäß Anspruch 8. 9. primary coil arrangement (4), in particular an inductive charging station (2), with a primary coil (5), which can be connected to an AC network, and at least one sensor coil (12), which is arranged in such a way that by applying an electrical current or electrical voltage at the primary coil (5) an electrical voltage is induced in the sensor coil (12), characterized by the control device (20) according to claim 8.
10. Primärspulenanordnung (4) nach Anspruch 9, dadurch 10. primary coil arrangement (4) according to claim 9, characterized
gekennzeichnet, dass die Primärspulenanordnung (4) characterized in that the primary coil arrangement (4)
primärspulenstromsensorfrei ausgebildet ist. primary coil current sensor is formed.
11. Primärspulenanordnung (4) nach einem der Ansprüche 9 und 10, dadurch gekennzeichnet, dass die Sensorspule (12) direkt auf einer Stirnseite der Primärspule (5) angeordnet ist. 11. Primary coil arrangement (4) according to one of claims 9 and 10, characterized in that the sensor coil (12) is arranged directly on an end face of the primary coil (5).
PCT/EP2019/078055 2018-10-17 2019-10-16 Method for determining a coil current of a primary coil, control device for a primary coil arrangement, primary coil arrangement WO2020079061A1 (en)

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