WO2009050625A2 - Système de transfert d'énergie électrique - Google Patents

Système de transfert d'énergie électrique Download PDF

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Publication number
WO2009050625A2
WO2009050625A2 PCT/IB2008/054174 IB2008054174W WO2009050625A2 WO 2009050625 A2 WO2009050625 A2 WO 2009050625A2 IB 2008054174 W IB2008054174 W IB 2008054174W WO 2009050625 A2 WO2009050625 A2 WO 2009050625A2
Authority
WO
WIPO (PCT)
Prior art keywords
power transfer
portable device
transfer device
data
coil
Prior art date
Application number
PCT/IB2008/054174
Other languages
English (en)
Other versions
WO2009050625A3 (fr
Inventor
Remco H. W. Pijnenburg
Bruno Motte
Original Assignee
Nxp B.V.
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 Nxp B.V. filed Critical Nxp B.V.
Publication of WO2009050625A2 publication Critical patent/WO2009050625A2/fr
Publication of WO2009050625A3 publication Critical patent/WO2009050625A3/fr

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Classifications

    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
    • 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
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/22—Capacitive coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H04B5/263—Multiple coils at either side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

Definitions

  • the present invention relates to a power transfer system for transferring electric power from a power supply device to a portable device.
  • Portable devices, and in particular electronic equipment, such as mobile phones or small hand-held computers and wireless devices include secondary power cells for power supply which are usually provided in the form of rechargeable power cells (rechargeable batteries) saving the user the costs and the inconvenience of regularly having to purchase new (not rechargeable) cells.
  • Rechargeable cells are preferred due to economical and environmental reasons.
  • a charging operation of the rechargeable cells can be performed by using an adaptor or charger which takes power from a public electrical power network (mains power supply) or other adequate sources of power.
  • the adaptor or charger connected to the mains power supply is further connected by a supply line and a suitable connector to the portable device, and charging starts immediately upon connecting these devices. When the charging operation is completed, this is usually displayed on the display means of the portable device, and charging may be stopped or reduced.
  • the adaptors and chargers usually require the users to plug a connector into the device, and the devices cannot be used in wet environment due to the possibility of corroding or shorting out the contacts, and also such devices cannot be used in flammable gaseous environment due to the possibility of creating electrical sparks.
  • the problems above can be solved by replacing the conventional chargers or adaptors by inductive chargers for transmitting the electric energy for charging the batteries of a device by means of a magnetic field and a direct magnetic coupling without a physical electrical connection. Since the inductive chargers for wireless charging remove the need to have open electrical contacts in conjunction with a cable connection it is possible to use such chargers in wet or dusty environments since both the chargers and the device to be charged can be provided as sealed devices.
  • the basical principal of such inductive chargers involves magnetic cores with a coil wound around the cores, and a generated magnetic field penetrating through the air gap or a region of non-magnetic material between the devices and forming a magnetic inductive link for power transmission.
  • planar inductive battery charger an example of which is disclosed in prior art document WO 03/105308 Al.
  • On a charging surface of a planar charging module is at least one planar coil or a plurality of planar coils arranged to generate a planar magnetic field.
  • this planar magnetic field an inductive coupling to a device placed thereon is established when this device (a portable device such as a mobile phone) is also equipped with a corresponding magnetic coil.
  • the battery included in the portable device can be charged when the portable device is placed on the planar surface of the charging module and the magnetic field of the charging module is coupled to the coil of the portable device.
  • power transfer pads have been developed, these pads generating an electromagnetic field over a large area, and preferably the whole pad area. The user can simply place one or more devices the batteries of which are to be charged on the pad with no requirement to place them accurately or at a predetermined position.
  • planar charging module of document WO 03/105308 Al an array of planar coils is provided and only coils which are needed are activated.
  • the electromagnetic field generated is perpendicular to the pad and only around the position where the portable device is placed.
  • the relative location of the portable device on the planar charging module can be sent and a control unit can then activate the appropriate coils to deliver power to these coils which in turn deliver power via the magnetic field to the portable device.
  • a charging efficiency when the portable device is placed on the charging module or docking station for enabling a wireless charging of the portable device the user must provide a setting of the charging module or docking station to obtain an optimized charging process with the highest effectivity and the minimum time duration for successfully completing the charging process.
  • the power transfer system of the present invention comprises a power transfer device as well as at least one portable device.
  • the power transfer device includes at least one coil arrangement for generating or receiving a magnetic field, and a first controller coupled to the coil arrangement for driving the coil arrangement to supply power to the portable device placed upon the power transfer device, via the generated magnetic field.
  • the portable device includes a further coil for generating and receiving a magnetic field, a battery power source, and a second controller coupled to the further coil for supplying power received via the magnetic field generated by the power transfer device, to charge the battery power source.
  • the first controller and the second controller are adapted to respectively drive the coil arrangement of the power transfer device and the further coil of the portable device to establish between the power transfer device and the portable device a near field communication link (NFC link) for transferring data, and a power transfer link for supplying power for charging the battery power source of the portable device.
  • NFC link near field communication link
  • the power transfer system consists of the power transfer device which can generate a magnetic field to transmit power via this magnetic field, and corresponding coils arranged in the power transfer device and in the portable device, as well as of this portable device which is designed so that an inductive link between the power transfer device and the portable device can be established.
  • each of the power transfer device and the portable device comprises a controller (respective first and second controller), and the first controller of the power transfer device is connected to a coil arrangement and drives this coil arrangement for generating or receiving a magnetic field.
  • the second controller arranged in the portable device is connected to a further coil arranged in the portable device, and drives this coil for generating or receiving a magnetic field.
  • each of the first and second controllers can drive the respective coil for establishing a data communication link in the form of a near field communication (NFC) as well as for establishing a power transfer link for transferring electric power via the magnetic field generated in the power transfer device to the portable device placed on the power transfer device for charging the rechargeable cells or the battery power source in the portable device.
  • NFC near field communication
  • the second controller drives the coil arranged in the portable device, and in a similar manner the first controller drives the coil arrangement in the power transfer device, so that the coil arrangement and the coil, respectively, are used for both the data communication link via near field communication (NFC) and the power transfer link.
  • the data communication link on the basis of the near field communication
  • NFC establishes a link for versatile data communication, the link being automatically established when the portable device comes into the near field communication range of the power transfer device.
  • data communication link based on the near field communication is established, data peculiar to the properties of the portable device can be transmitted to the power transfer device so that an automatic setting of the power transfer device depending upon the kind of portable device used can be performed.
  • the method includes a step of driving the coil arrangement by the first controller and the further coil by the second controller to establish a data communication link based on a near field communication, exchanging data between the power transfer device and the portable device by the near field communication, and driving the coil arrangement by the first controller and the further coil by the second controller to establish a power transfer link for supplying power to the portable device for charging the battery power source.
  • the portable device and the power transfer device are arranged close to each other which is in the near field communication range, so that automatically on the basis of the near field communication a data communication link is established and a data exchange can be performed.
  • data peculiar to the portable device and reflecting the technical properties thereof can be transmitted to the power transfer device by means of the near field communication (NFC) so that depending upon the detected kind of portable device the charging operation can be set in the power transfer device to ensure an optimized and gentle charging of the battery power source (rechargeable cells) of the portable device.
  • the various portable devices of different kind and charging requirements owned by the user and having a near field communication (NFC) functionality can be easily charged without the requirement of a manual setting of the power transfer device to obtain an optimized charging process.
  • NFC near field communication
  • the data exchange between said portable device and said power transfer device includes data peculiar to the portable device, and may include identification data of said portable device.
  • the first controller of the power transfer device includes a driver circuit for driving the first and second coils to first establish the data communication link and then establish said power transfer link
  • the second controller of the portable device includes a driver circuit for driving said further coil to first establish said data communication link and then establish said power transfer link.
  • Fig. 1 shows the basic concept of the present invention in the form of a schematic diagram.
  • Fig. 2 shows an embodiment of the present invention with more details of the power transfer device and the portable device shown in Fig. 1.
  • Fig. 3 shows a circuit arrangement for driving magnetic coils arranged in the power transfer device as well as the portable device as shown in Fig. 2.
  • Fig. 4 shows a flow chart of a data communication process carried out for establishing a data communication link.
  • Fig. 5 shows the basic arrangement of the power transfer system according to a second embodiment of the present invention.
  • Fig. 6 shows a third embodiment of the power transfer system according to the present invention.
  • Fig. 1 shows the basic arrangement of the present invention in the form of a schematic diagram in which a power transfer device 10 is provided as a charging device or a charging pad for a portable device 20 which includes a battery power source 21 in the form of a rechargeable battery which is to be charged by the power transfer device 10. That is, the portable device 20 is powered by the battery power source 21.
  • a power transfer device 10 is provided as a charging device or a charging pad for a portable device 20 which includes a battery power source 21 in the form of a rechargeable battery which is to be charged by the power transfer device 10. That is, the portable device 20 is powered by the battery power source 21.
  • the power transfer device 10 receives power from a mains power supply network PS which is usually provided in the form of a public power supply network. In case the power transfer device 10 is connected to the mains power supply PS, the power transfer device 10 is able to deliver electric power to the portable device 20 or charging the battery power source 21 of the portable device 20.
  • a mains power supply network PS which is usually provided in the form of a public power supply network.
  • the power transfer device 10 is able to deliver electric power to the portable device 20 or charging the battery power source 21 of the portable device 20.
  • the portable device 20 must be placed on the power transfer device 10 or must be located very close to the power transfer device 10. This is the precondition for obtaining a magnetic coupling (inductive coupling) between the power transfer device 10 and the portable device 20.
  • a communication data link 32 on the basis of a near field communication (NFC) is established between the power transfer device 10 and the portable device 20.
  • NFC near field communication
  • Fig. 1 In addition to the basic structure of the power transfer system according to the present invention as is shown in Fig. 1 further details of the structure of each of the power transfer device 10 and the portable device 20 are shown in Fig. 2 which is based on the structure shown in Fig. 1. Moreover, the power transfer device 10 and the portable device 20 have a magnetic coupling for establishing a power transfer link 31 for supplying power to the portable device 20 for charging the battery power source 21, as well as a data communication link 32 based on the near field communication (NFC).
  • NFC near field communication
  • the power transfer device 10 is basically a planar power transfer device 10 having a coil arrangement CA as shown in Fig. 2.
  • a first power transfer coil 11, a second power transfer coil 12 as well as a data communication coil 13 constitute the coil arrangement CA of the power transfer device 10.
  • the different coils of the coil arrangement CA are connected to a first controller 15 arranged in the power transfer device 10 for driving the coil arrangement CA to establish and obtain the power transfer link 31 as well as the communication link 32 based on near field communication, that is, the coils involved are adapted for generating or receiving a magnetic field.
  • the portable device 20 comprises a second controller 22 which receives power from the battery power source 21 and is further connected to a coil 23 which serves for establishing a power transfer link for receiving power from the power transfer device 10 and for establishing the data communication link 32 based on near field communication (NFC). That is, the second controller 22 of the portable device 20 drives the coil 23 to establish either the power transfer link 31 or the data communication link 32 between the portable device 20 and the power transfer device 10, that is, the coil 23 is adapted for generating or receiving a magnetic field.
  • NFC near field communication
  • the portable device 20 For establishing the power transfer link 31 and the communication link 32 as is shown in Fig. 1 and 2 between the power transfer device 10 and the portable device 20, the portable device 20 must be arranged closely to the power transfer device 10 so that a magnetic field generated by the coil arrangement CA of the power transfer device 10 can penetrate the coil 23 of the portable device 20, and a magnetic field generated by the coil 23 of the portable device can penetrate the coil arrangement CA of the power transfer device 10 to obtain the necessary magnetic or inductive coupling.
  • Fig. 2 shows the first and second power transfer coils 11 and 12 of the power transfer device 10, but the power transfer device 10 is not limited to this coil arrangement shown in Fig. 2 which only constitutes an explanatory example, and further power transfer coils can be arranged on the power transfer device 10 if needed or appropriate.
  • further power transfer coils are provided in addition to the power transfer coils 11 and 12 in the power transfer device 10 shown in Fig. 2, plural portable devices 10 can be placed on or close to the power transfer device 10 provided that the magnetic coupling between the coil arrangement CA of the power transfer device 10 and the coil 23 of the respective portable device 20 is assured.
  • both the power transfer device 10 and the portable device 20 include a coil arrangement or a coil, respectively, to establish between the power transfer device 10 and the portable device 20 a communication link 32 on the basis of a near field communication for exchanging data, and the power transfer link 31 for supplying power from the power transfer device 10 to the portable device 20 for charging the battery power source 21 of the portable device 20.
  • both devices need to have the near field communication functionality (NFC functionality) so that a communication link on the basis of the near field communication can be initiated and established.
  • the near field communication NFC is a very short-range wireless technology, for distances measured in centimeters, and is optimized for intuitive, easy and secure communication between various devices, such as the above power transfer device 10 and the portable device 20, without any configuration to be carried out by the user.
  • various devices such as the above power transfer device 10 and the portable device 20, without any configuration to be carried out by the user.
  • the NFC interfaces or circuits arranged in the particular devices will automatically connect and configure themselves to form a peer-to-peer network.
  • NFC near field communication
  • Devices to communicate via a data communication link 32 on the basis of the near field communication must therefore be equipped with the circuits and magnetic coils for establishing the data communication link 32, and such NFC circuits and coils can be included, for example, in wireless mobile communication devices like mobile phones, PDAs and the like.
  • Confidential data and data with presenting value can be stored in a secure memory area and can always stay in the portable device (mobile device).
  • the NFC functionality included in the portable device for example in a PDA or a mobile phone can be transmitted as the data transmission or data communication and can be encrypted by a secure NFC functionality using a private encryption key stored on the mobile phone.
  • NFC near field communication
  • RFID radio frequency identification
  • the portable device 20 includes the coil 23 which serves for both establishing a data communication link 32 based on near field communication, as well as for establishing the power transfer link 31 which serves for transmitting power in a wireless manner from the power transfer device 10 to the portable device 20.
  • Both links 31 and 32 require magnetic coupling which is provided by respective magnetic coils in both devices for which an interconnection is to be provided, and the magnetic coupling requires an arrangement of both devices close to each other, and preferably that the portable device 20 is placed on a planar surface or adequate surface on the power transfer device 10.
  • the short distance of the data communication link 32 based on near field communication lies between 0 and 0.1 m.
  • Fig. 3 shows the basic structure of a circuit arrangement which can be provided in the portable device 20 and specifically in the controller 25 thereof for driving the coil 23 which is a single coil and which serves for both establishing or supporting the data communication link 32 as well as the power transfer link 31 between the portable device 20 and the power transfer device 10 when both devices are located within the very small distance of the power supply range which is smaller than the transmission range for near field communication.
  • the inductor Ll corresponds to the coil (loop coil) 23 of the portable device, and may have, for example, an inductivity of about 3 ⁇ H.
  • the further inductor L2 (which may have an inductivity of 10 ⁇ H) only serves as a choke coil to decrease the loading on the 50 Ohm port.
  • the coil (loop coil) Ll which corresponds to coil 23 of the portable device 20, is active when at terminal SV in Fig. 3 a higher voltage level (of for example +12 V) is applied.
  • the diode D2 is conducting and diode Dl is off.
  • the loop is tapped with capacitors towards 50 Ohm impedance to achieve matching to 50 Ohms.
  • the coil Ll is not active and tuned to a lower frequency (which may have a value of about 3.6 MHz) when a lower voltage is applied to terminal SV (having for example -5 V).
  • the diode D4 is non-conducting, and diode Dl is conducting and the capacitor Cl is switched in parallel to the coil Ll (loop coil, coil 23 of portable device 20).
  • the voltages are controlled by the second controller 25 of the portable device 20.
  • the coil 23 of the portable device which is a single coil is used for both purposes of data communication and power transfer (via magnetic field from the power transfer device 10) and is depending upon the kind of link to be established (data communication link 32 or power transfer link 31) driven in a different and appropriate manner.
  • the data communication link based on near field communication requires a tuning of the circuit and the coil (loop coil) 23 to the frequency range of about 13.56 MHz, whereas a frequency range for the power transmission can for example be about 460 kHz, or may have a range of approximately 430 kHz to approximately 1.8 MHz.
  • the circuit arrangement shown in Fig. 3 provides a different tuning or setting of the second controller 25 for driving the single coil 23 for the data communication link 32 based on near field communication (NFC) and for the power transfer link 31.
  • NFC near field communication
  • the circuit arrangement can be simplified since the coils for power transfer or data transmission require coils with certain dimensions, and when using only one single coil for both purposes, this reduces the size of the portable device 20, the hardware and costs. That is, the coil which is usually used for providing a magnetic coupling to a wireless charging system is also used for establishing a data communication link, such as the data communication link 32 shown in Fig. 1 and 2, and can be further used for radio frequency identification RFID.
  • any portable device 20 the battery power sources of which have to be charged by a wireless charger such as the power transfer device 10 according to the present invention, and when a near field communication functionality is implemented in both devices, only one coil for the portable device to reduce the dimensions thereof is provided.
  • the data communication when both the power transfer device 10 and the portable device 20 have implemented therein the near field communication functionality (NFC functionality), then a predetermined data exchange can take place when the data communication link 32 has been established in a stable manner.
  • NFC functionality near field communication functionality
  • the power transfer device 10 When according to the near field communication standard (NFC standard) the data communication link 32 has been established, it is possible for the power transfer device 10 to identify the kind of portable device 20 and even a particular individual portable device, after establishing the data communication link 23 (when the portable device 20 is placed on or closely to the power transfer device 10), data stored in the portable device 20 can be transmitted from the portable device 20 to the power transfer device 10 via near field communication (data communication link 32) under control of the second controller 25 of the portable device 20 and by means of the magnetic coupling to the coil 23.
  • the 10 may include an identification number, an individual production number or any further predetermined data which allow an identification of a group of portable devices or an individual portable device (such as a mobile phone with NFC functionality). Moreover, an information about the charging conditions of the battery power source 21 of the portable device 20 can be transmitted to the power transfer device 10 to optimize the charging conditions (strength of the magnetic field generated in the power transfer coils 11 and 12) in view of voltage and current for charging the battery power source 21.
  • the individual portable device may send data regarding a particular charging condition or may submit data which allow the particular portable device 20 to be assigned to a certain category of charging conditions, such as, for example, category 1 : charge type IW, category 2: charge type 2W (fast charge), and category 3 : charge type xx W, indicating any further category.
  • category 1 charge type IW
  • category 2 charge type 2W (fast charge)
  • category 3 charge type xx W, indicating any further category.
  • Further identification data may be a brand name, a device type, a serial number and corresponding data.
  • the transmitted information in the form of data may also include an information about communication ports available for the portable device 20, for example Bluetooth, IR, USB, and other corresponding communication ports.
  • the transmitted data may further include the battery type as well as power coil dimensions which allow a suitable setting of the power transfer device 10 for optimize power transfer to the portable device 20.
  • Such data can be stored in an appropriate storing means in the second controller 25 of the portable device 20 and can be provided according to a standardized format for such stored data so that easy data evaluation is possible when transmitted via the NFC functionality (data communication link 32) to the power transfer device 10, and in particular for handling of such data in the first controller 15 which receives the communication data via a magnetic coupling between the coil 23 of the portable device 20 and the communication coil 13 in the power transfer device 10.
  • the first controller 15 of the power transfer device may temporarily store such data and may compare such data transmitted via the near field communication from the portable device 20 with data stored before hand in the power transfer device (in conjunction with the first controller 15) to determine an authorization for charging the specific portable device, or to determine further conditions, such as the allowance of further data transmission.
  • the transmitted data can be evaluated by the first controller 15 in the power transfer device 10 in view of plausibility, and for identification purposes particular data or values can be compared with prestored corresponding data and values in the power transfer device 10. In case of data matching identification can be performed and an authorization for further data transmission or for a subsequent wireless charging process can be determined.
  • the controller 15 of the power transfer device 10 drives the power transfer coils 11 and 12 so that power can be transmitted via the generated electromagnetic field to the portable device and can be received by the coil 23 due to magnetic coupling.
  • the battery power source 21 of the portable device 20 can be charged in a suitable and optimized manner by wireless charging.
  • the data stored in the portable device 20 and the data stored in the power transfer device 10 for the purpose of data matching and data evaluation can be programmed at the manufacturing process of the devices, where a suitable electronic chip (memory, tag IC) is programmed or written with corresponding data. After completion of the programming process at the manufacturer the electronic chip or memory should be set for "write protected” to avoid any later customer problems or accidental erasure of necessary data. Hence, such data support technical conditions or administrative conditions.
  • the portable device 20 is placed near or set on the wireless charger, such as the power transfer device 10 according to the present invention and both devices have NFC functionality, a quick establishment of the data communication link is carried out, thereby referring to the standard for NFC functionality (protocol).
  • a corresponding data communication is shown in Fig. 4.
  • the process includes plural steps for data communication and evaluation thereof.
  • step Sl When the portable device 20 is placed on the power transfer device 10, an automatic establishment of the data communication link 32 via NFC functionality is carried out (step Sl).
  • step S2 an identification process regarding the portable device 20 in question is carried out, resulting in defining three categories of the kind of portable device 20.
  • step S 13 In category A when proceeding from step S2 the portable device is according to step S 13 identified as a portable device having an NFC functionality so that a data communication link 32 via NFC and a subsequent power transfer link 31 (charging) can be established.
  • a data communication link 32 via NFC and a subsequent power transfer link 31 charging
  • data communication is basically completed charging of the battery power source 21 of the portable device 20 can be carried out.
  • step S 14 such an information can be displaced on a display means arranged on the portable device 20 and/or on the power transfer device 10 (not shown in the Figures) so that the user can be informed about the kind of portable device and the further operating conditions, that is, what kind of process is actually running.
  • step S 15 after identification has been completed, data transmission as well as charging is allowed.
  • step S21 a manual setting is possible
  • step S22 such an information is displayed to inform the user about the detected conditions.
  • step S23 a charging operation can be carried out.
  • step S31 of Fig. 4 it is verified that the kind of portable device 20 placed on or near the power transfer device 10 has implemented an NFC functionality but requires no charging.
  • step S32 such an information is displayed, and after an identification of the individual portable device 20 base on the NFC functionality, only data transmission is possible and can be carried out.
  • No charging is performed, i.e. the power transfer coils 11 and 12 of the coil arrangement CA of the power transfer device 10 are not driven, and only the communication coil 13 is used and driven to establish and support the data communication link 32 via the NFC functionality.
  • Category C is applicable in case a passive device such as a tag with NFC functionality is available having no individual power supply, or when for any other reasons any charging is not to be carried out or cannot be carried out due to technical reasons.
  • the display means of a portable device may notify the user of any data detected or exchange or any prevailing conditions.
  • Corresponding information can also be displayed on a display means of the power transfer device 10.
  • Such an information may refer to the start and the end (completion) of the charging process, any feedback information about the actual battery status (state of charge of the battery), and when the portable device 20 is ready to initiate a rapid exchange of data (further data exchange) via a specific port, or may, for example, display any error messages helpful for the user.
  • the data handling and evaluation process and in particular the identification operation when the data communication link 31 has been established provides each of both devices involved with necessary or helpful data so that the identification operation helps to avoid that a non-compliant device is charged since charging a non-compliant device may lead to deterioration or malfunction thereof. Furthermore, a specific kind (brand) of power transfer device may not wish to charge specific or non-specific portable devices.
  • the identification of the portable device by data exchange and data matching in the power transfer device 10 supports an adaptation of the behavior or service of the power transfer device 10 in view of specific charging parameters, data transfer conditions and specific services between the portable device 20 and the power transfer device 10.
  • the power transfer device 10 in view of further and optimized data exchange and data evaluation can be connected to any local network (LAN) or any other computer system or host computer or server. This would extend or upgrade the services offered.
  • the data communication can be carried out according to a certain identification protocol or data storage standard which has to be implemented in both controllers regarding the program (sequence of steps to be carried out) and the data format stored.
  • the protocol distinguishes between the priority of the two devices for which a data communication link is to be established, one device constituting the initiator and the other device constituting the target.
  • the power transfer device 10 forms the initiator and the portable device 20 forms the target from which data are requested and from which upon output of a pertinent request such data are transmitted to the initiator (power transfer device 10).
  • the data exchange may also be used for registration of individual portable devices 20 and for billing purposes according to the electric energy drawn from the charger in the form of the power transfer device 10 in public places (such as, for example, waiting rooms at the airport) or in view of the amount of data exchange in conjunction with the near field communication (NFC). Specific conditions such as time and costs or other information necessary or helpful for the user can be displayed.
  • a connection of the power transfer device 10 to a computer local network or host computer, depending upon the user's intention and in case the portable device 20 is provided in the form of a mobile phone, a time table, a calendar, an appointment book, a real time setting and other general notings can be transferred to and from the computer connected to the power transfer device 10 so that the user after charging and data communication of the mobile device can easily go over his notes in a computer connected thereto (such connection can be wireless or by cable).
  • Fig. 1 to 4 facilitates the wireless power transfer to portable devices 20 when both the portable device 20 and the power transfer device 10 (charger) need to contain relative large coils to create the inductive link.
  • the portable device 20 one single coil is used for multiple purposes, that is for power transfer and for data communication, such as a near field communication (RFID) so that an additional coil to provide the NFC functionality is not necessary.
  • RFID near field communication
  • Even the integration of two separate coils would in contrast thereto consume a large volume and would make the dimensions of the portable device 20 bigger and would raise the costs.
  • the embodiment above exhibits the advantage of using an implemented power transfer coil in the portable device 20 in an efficient manner also for a data communication link (NFC functionality, RFID functionality).
  • Fig. 5 shows a second embodiment of the present invention.
  • the schematic view shown in Fig 5 basically corresponds to the arrangement shown in Fig. 1 and 2, and the difference between the structure shown in Fig. 5 and that of Fig. 1 and 2 lies in the omission of a separately provided communication coil (communication coil 13 in Fig. 2) in the power transfer device 10.
  • the coil arrangement CA of the power transfer device 10 now includes a first coil 11 and a second coil 12 which serve for purposes of power transfer to a portable device 20 in the manner as described in conjunction with the first embodiment (power transfer link 31), and also for establishing a data communication link 32 based on NFC technology (NFC functionality).
  • a coil 23 of the portable device 20 is identical to the coil 23 of the first embodiment and serves for power transfer from the power transfer device 10, as well as for establishing and supporting the data communication link 32.
  • the first and second coils 11 and 12 of the coil arrangement CA of the power transfer device 10 according to the second embodiment of the present invention can also be used for the purposes of data transmission and power transfer so that the additional coil (communication coil 13 in Fig. 2) can be omitted.
  • the general function of the power transfer system according to the second embodiment is basically the same as that of the first embodiment with the exception that a circuit arrangement as shown in Fig. 3 for driving coil 23 which is used for data transmission and for power transfer and implemented in the second controller 25 of the portable device 20 is also implemented in the first controller 15 of the power transfer device to drive the first and the second coils 11 and 12.
  • one coil for example the first coil 11 or the second coil 12 according to Fig. 5
  • the provision of one coil (for example the first coil 11 or the second coil 12 according to Fig. 5) of the power transfer device 10 makes it possible to arrange a plurality of such multi-purpose coils in the power transfer device 10 so that on the power transfer device 10 plural portable devices 20 can be placed for data communication and for charging purposes, if the individual properties of the portable device 20 allow or require charging.
  • the individual charging conditions or data transmission conditions can be set in the power transfer device 10 for optimized data communication and charging of the battery power source 21 of the particular portable devices 20.
  • the first controller 15 of the power transfer device 10 may have a drive circuit such as shown in Fig. 3 to drive the first and the second coils 11 and 12 of the coil arrangement CA. The structure in Fig.
  • FIG. 5 only shows two coils, whereas depending upon the necessary size of the power transfer device 10 a higher number of coils, such as coils 11 and 12 can be implemented, and these plural coils are driven by a circuit as shown in Fig. 3.
  • the driving of the particular coils has to be controlled by the controller (first controller 15) and a continuous scanning of all coils is carried out so that every coil implemented is activated and driven as is explained above in conjunction with the circuit arrangement of Fig. 3. That is, in subsequent activation each coil is driven.
  • the different coils of the power transfer device 10 (see Fig. 2 and 5) of the coil arrangement CA are presented in these Figures in a schematic manner, and the coils can be provided in the power transfer device 10 representing the kind of charging pad within arrangement departing from that schematic representation shown in the Figures without deteriorating the function and advantages obtained by the power transfer system according to the present invention.
  • the power transfer link 31 for charging the battery power source of the portable device both devices have to be arranged very closely to each other, whereas the near field communication (NFC) can be established within a short distance range up to approximately 0.1 M. Hence, when the portable device 20 is placed on or closed to the power transfer device 10, the NFC distance is fulfilled.
  • NFC near field communication
  • Fig. 6 shows a third embodiment of the power transfer system according to the present invention.
  • the power transfer system also involves a power transfer device 10 and a portable device 20 having a battery power source 21 and the possibility of obtaining a power transfer link 31 as well as a data communication link 32 based on near field communication (NFC functionality).
  • the power transfer device 10 as such, which receives power from a mains power supply PS such as a public power supply network, does not have an NFC functionality, but the NFC functionality is provided to the power transfer device 10 in the form of an NFC retrofit kit 40.
  • This NFC retrofit kit is mounted to the power transfer device 10 in a mechanical manner to be close to the area or surface of the power transfer device 10 on which or closed to which the portable devices 20 are arranged or placed.
  • the NFC retrofit kit 40 is in view of power supply and data transmission directly connected to the power transfer device 10 and is specifically linked with the first controller 15 shown in Fig. 2 and 5. Moreover, the NFC retrofit kit 40 includes the coil for only data transmission, so that a magnetic coupling is provided on the one hand between the power transfer coils of the power transfer device 10 for power transfer to the portable device, and on the other hand from the multi-purpose coil of the portable device 20 to the NFC retrofit kit 40 for data communication.
  • the NFC retrofit kit 40 receives the data and supplies these data to the first controller 15 of the power transfer device 10, and is also able to transmit corresponding data to the portable device 20.
  • NFC functionality with an additional NFC functionality to exhibit the advantages presented above in conjunction with the first and second embodiments when a portable device in question is equipped with an NFC functionality
  • the NFC retrofit kit 40 can be supplemented. The advantages obtained are the same as discussed in conjunction with the first embodiment.
  • the coils arranged in the power transfer device are only driven to provide and support the power transfer link 31 suitable for charging the battery power source 21 of the portable device 20.
  • the additional provision of the NFC retrofit kit 40 makes it possible for the user to avoid any manual setting when charging of any portable device having NFC functionality is necessary and when a data matching in an identification operation can be determined.
  • this case represents an active NFC mode of communication between the devices involved. It is assumed that the power transfer device 10 is the initiator of the near field communication (NFC) and starts communication at a selected transfer speed. The portable device 20 which is powered by the battery power source 21 receives the data or communication information transmitted from the power transfer device 10 and answers at the same transfer speed. Based on these initial steps the data transmission can be carried out until sufficient data are exchanged or data transmission is completed.
  • Category C when proceeding from step S2 in Fig. 4 represents the passive
  • NFC mode which means that the portable device 20 is not powered by any individual battery power source.
  • the initiator of the NFC which is assumed to be represented by the power transfer device 10 starts communication at a selected transfer speed.
  • the portable device 20 not powered by any battery power source answers by using load modulated data at the same transfer speed upon reception of the data transmitted from the power transfer device 10.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

L'invention concerne un système de transfert d'énergie électrique qui comporte un dispositif de transfert d'énergie électrique ainsi qu'au moins un dispositif portatif. Le dispositif de transfert d'énergie électrique inclut au moins un ensemble bobine destiné à générer ou à recevoir un champ magnétique, et un premier système de commande couplé à l'ensemble bobine de façon à amener l'ensemble bobine à fournir de l'énergie électrique au dispositif portatif placé sur le dispositif de transfert d'énergie électrique, via le champ magnétique généré. Le dispositif portatif inclut une autre bobine destinée à générer et à recevoir un champ magnétique, une source d'énergie électrique de batterie et un second dispositif de commande couplé à l'autre bobine de façon à fournir l'énergie électrique reçue par l'intermédiaire du champ magnétique généré par le dispositif de transfert d'énergie électrique, afin de charger la source d'énergie électrique de batterie. Plus particulièrement, le premier et le second dispositifs de commande sont conçus pour amener respectivement l'ensemble bobine du dispositif de transfert d'énergie électrique et l'autre bobine du dispositif portatif à établir, entre le dispositif de transfert d'énergie électrique et le dispositif portatif, une liaison de communication en champ proche (NFC), destinée à transférer des données, et une liaison de transfert d'énergie électrique destinée à fournir de l'énergie électrique, afin de charger la source d'énergie électrique de batterie du dispositif portatif.
PCT/IB2008/054174 2007-10-15 2008-10-10 Système de transfert d'énergie électrique WO2009050625A2 (fr)

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WO2014148264A1 (fr) * 2013-03-18 2014-09-25 Canon Kabushiki Kaisha Appareil de communication, son procédé de commande, et support de stockage
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US10413807B2 (en) 2013-05-09 2019-09-17 Mattel, Inc. Resonant coils for use with games and toys
US9776071B2 (en) 2013-05-09 2017-10-03 Mattel, Inc. Resonant coils for use with games and toys
US10994191B2 (en) 2013-05-09 2021-05-04 Mattel, Inc. Resonant coils for use with games and toys
WO2016028597A1 (fr) * 2014-08-20 2016-02-25 Qualcomm Incorporated Charge rapide de pile au moyen d'une rétroaction numérique
US9634502B2 (en) 2014-08-20 2017-04-25 Qualcomm Incorporated Fast battery charging through digital feedback
CN104950746A (zh) * 2015-06-09 2015-09-30 国网山东即墨市供电公司 一种电力设备运维管理方法及控制系统
US10432263B2 (en) 2015-09-30 2019-10-01 Datalogic Ip Tech S.R.L. Near field communication channel initiation via wireless charging channel
WO2017056118A1 (fr) * 2015-09-30 2017-04-06 Datalogic Ip Tech S.R.L. Initiation de canal de communication en champ proche par l'intermédiaire d'une session de canal de charge sans fil d'un système mobile à une station de base
US10491271B2 (en) 2015-12-23 2019-11-26 Datalogic Ip Tech S.R.L. Coexistence of wireless charging and near field communication in a portable data terminal
US11296557B2 (en) 2017-05-30 2022-04-05 Wireless Advanced Vehicle Electrification, Llc Single feed multi-pad wireless charging
US11621586B2 (en) 2017-05-30 2023-04-04 Wireless Advanced Vehicle Electrification, Llc Single feed multi-pad wireless charging
US11462943B2 (en) 2018-01-30 2022-10-04 Wireless Advanced Vehicle Electrification, Llc DC link charging of capacitor in a wireless power transfer pad

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