• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A near field communication device (18) comprising: a processing module (10) and a first antenna (14) arranged in a first near field communication zone (12) and connected to said processing module (10), a first presence detector (16) arranged in the first zone (12); • a second antenna (15) arranged in a second near-field communication zone (13), the first antenna (14) and the second antenna (15); ) being electrically in series and forming an antenna circuit (29), • a second presence detector (17) arranged in the second zone (13), • a control circuit (11) adapted to place the antenna circuit (29) in at least two different modes of operation: - a first mode, called "functional mode" in which the antenna circuit (29) allows communication in the near field, - a second mode, called "dysfunctional mode", wherein the antenna circuit (29) does not allow the near field communication.
    公开号:FR3051578A1
    申请号:FR1654443
    申请日:2016-05-19
    公开日:2017-11-24
    发明作者:Mohamed Cheikh；Guillaume Vigneau；Said Bouguern
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    The present invention is in the field of devices suitable for communication between electronic devices. More particularly, the present invention relates to a near field communication device, called "NFC" (Near Field Communication) to ensure communication with one or more communication devices in the near field (smartphones or other ). The present invention finds a particularly advantageous application, although in no way limiting, in communication devices installed in motor vehicles.
    The NFC near-field communication protocol allows the exchange of frames between devices up to a distance of about 10 centimeters. This near field communication technology is used in many areas.
    In particular, it is known to provide a near field communication zone near a dashboard of a motor vehicle. The driver can approach a near-field communication device such as a smartphone, tablet or other device equipped with an NFC module to this zone, so as to establish a near-field communication between the device and a computer of the NFC module. motor vehicle. This communication can be used for example to authorize the starting of the motor vehicle via a secure smartphone, to pair between the near-field communication device and the motor vehicle computer, this pairing making it possible to establish a Bluetooth connection in the vehicle. cockpit, or for any other purpose.
    Since near-field communication is short-range in a motor vehicle, not all passengers can easily access the near-field communication area. It is therefore necessary to provide a second near field communication zone at another location of the motor vehicle. Naturally, in the presence of several near-field communication zones, certain priority rules between the zones must be put in place. In some cases, the use of the second near-field communication zone must be impossible in the absence of an NFC apparatus on the first near-field communication zone.
    The problem is therefore to create electronic circuits to manage the NFC communication simultaneously on several near-field communication areas and priorities between areas, while minimizing costs.
    The problem of the management of the priorities between the zones is particularly important in the particular case of a motor vehicle comprising a near-field communication zone disposed near the dashboard for starting the motor vehicle, and a second communication zone. in the near field for telematic use. In this case, the device shall prohibit the use of the second near-field communication area intended for telematic use when no NFC apparatus is present near the first near-field communication area for starting the vehicle. . This management of the priorities between zones makes it possible to ensure the safety of the passengers, and makes it possible to avoid that a telematic use is made on the second zone of communication in near field whereas the motor vehicle is not started, this which might drain the battery. By way of example, the prior art implements certain devices. There are systems in which the two near-field communication zones each comprise an NFC antenna connected to a processing module, these two separate processing modules being connected to an on-board computer of the motor vehicle which manages the priorities between the zones. This system has the disadvantage of being very expensive, indeed it requires the presence of two modules for processing the frames exchanged with the NFC antennas. The objective of the present invention is therefore to propose a solution that is more efficient and less costly than the prior art for managing the simultaneous communication of a computer with several near-field communication zones, making it possible to set up a prioritization on the computer. use of zones.
    According to a first aspect, the invention relates to a near-field communication device comprising: a processing module and a first antenna arranged in a first near-field communication zone and connected to said processing module, a first presence detector arranged in the first zone, • a second antenna arranged in a second near-field communication zone, the first antenna and the second antenna being electrically in series and forming an antenna circuit, • a second presence detector arranged in the second antenna zone, • a control circuit adapted to place the antenna circuit in at least two different modes of operation: - a first mode, called "functional mode" in which the antenna circuit (29) allows near-field communication - a second mode, called "dysfunctional mode", in which the antenna circuit (29) does not allow the communication in cham p near. said control circuit being configured to place the antenna circuit in the functional mode or in the dysfunctional mode according to detection signals provided by the first presence detector and the second presence detector.
    Thus, the near-field communication device advantageously allows simultaneous near-field communication on the first and second zones, with two separate near-field communication devices, and this with a single processing module for several NFC antennas. It is therefore a more economical solution.
    The control circuit makes it possible, when placing the antenna circuit in dysfunctional mode, to prohibit the device any communication in the near field. The control circuit places the antenna circuit in functional or mismatched mode according to a predetermined logic, which can be chosen according to the priorities associated with the NFC zones.
    According to particular embodiments, the invention also fulfills the following characteristics, implemented separately or in each of their technically operating combinations.
    In one embodiment, the control circuit is configured to place the antenna circuit in the dysfunctional mode if and only if: • the detection signal provided by the first presence detector indicates the presence of a communication device near field of said first zone, and • the detection signal provided by the second presence detector indicates the absence of a near-field communication apparatus near the second zone, the control circuit being configured to place the antenna circuit in functional mode for all other detection signal combinations provided by the first presence detector and the second presence detector.
    This logic of prohibiting the use of the device aims to make the second near field communication area a priority over the first near field communication zone.
    In one embodiment, the antenna circuit comprises at least a first capacitor adapted to ensure the resonance of the antenna circuit at a resonant frequency adapted to the near-field communication when the antenna circuit is in the mode. functional.
    In another embodiment, the control circuit comprises a first switch for short-circuiting the first capacitor so that the antenna circuit resonates at a frequency that is not adapted to near-field communication, in order to place the circuit. antennas in dysfunctional mode.
    In another embodiment, the control circuit includes a first switch for opening the antenna circuit to place it in a dysfunctional mode.
    In all cases, this antenna priority management system has the advantage of being simple, inexpensive, entirely hard "hardware", thus avoiding the problems of reaction times and thresholds specific to the use of a software.
    In addition, the presence detection of NFC objects is done at the NFC zones, and the dysfunctional setting of the antennas is done in the same place, without having to go through the processing module, which reduces the costs in terms of of wiring.
    In one embodiment, said first capacitor is arranged in the second zone.
    In one embodiment, the antenna circuit further comprises a second capacitor arranged in the first zone.
    This second capacitor makes it possible to improve the resonance of the antenna circuit.
    In one embodiment, said control circuit is arranged in the second zone and / or in the first zone. So the control circuit that manages the priorities between the zones is perfectly independent of the control module.
    In one embodiment, the device further comprises an active antenna, connected to the processing module, and the antenna circuit is electromagnetically coupled with said active antenna, so that said antenna circuit is connected to the module. treatment via the active antenna.
    This antenna configuration has the advantage of optimizing the resonance of the antennas, and improving near-field communication on both zones for low power consumption.
    In one embodiment, the antenna circuit is connected directly to the processing module.
    This configuration is the simplest, it has only two antennas instead of three in the previous configuration.
    In one embodiment, the first antenna and the second antenna are interconnected by twisted wires.
    These twisted wires, which connect the first NFC communication zone and the second NFC communication zone, make it possible to avoid problems of coupling or magnetic induction.
    The device described here has the advantage of managing the priority between the first zone and the second zone quickly and completely independently of the processing module.
    According to a second aspect, the present invention relates to a motor vehicle comprising a near-field communication device according to any one of the embodiments of the invention. Other advantages, aims and features of the present invention will become apparent from the following description, given for the purpose of explanation and in no way limiting with reference to the accompanying drawings, in which: FIG. 1 schematically represents a particular embodiment of the invention; invention, wherein the antenna circuit is directly connected to the processing module, - Figure 2 schematically shows a particular embodiment of the invention, wherein the device comprises an active antenna electromagnetically coupled with the circuit d FIGS. 3 schematically and in more detail a possible embodiment of the invention, in which the first switch makes it possible to short-circuit the first capacitor; FIG. 4 schematically represents a possible embodiment of FIG. the invention, wherein the first switch is adapted to open the antenna circuit nes.
    As of now, we note that the figures are not to scale. The invention finds its place in the context of devices 18 adapted to allow near field communication with one or more near field communication apparatus.
    Near-field communication or NFC means a short-range and high-frequency wireless communication technology, allowing the exchange of information between equipment.
    In some embodiments, the exchange of information is possible up to a distance of about 10 cm, the technology used applying an extension of ISO / IEC 14443.
    Near-field communication device is any electronic device adapted to communicate information using the NFC communication protocol. For example, many smartphones, tablets, smart cards, are now near field communication devices.
    A device 18 seion one of the réaisation modes described here can for example be embedded in a motor vehicle. The invention relates to a near-field communication device 18 comprising: • a processing module 10, • and a first antenna 14 arranged in a first near field communication zone 12 and connected to said processing module 10, • and a second Antenna 15 arranged in a second near-field communication zone 13, the first antenna 14 and the second antenna 15 being electrically in series and forming an antenna circuit 29.
    The processing module 10 may for example comprise an NFC microcontroller, an electromagnetic compatibility filter EMC, and an NFC adaptation stage, all these components being known per se to those skilled in the art. The processing module 10 is able to exchange frames with the near-field communication antennas connected to it. The processing module 10 is generally connected to a computer with which it exchanges information.
    The processing module 10, when exchanging frames on its port connected to one or more antennas, is ordinarily not adapted to distinguish with which antennas connected to it is communicating. The processing module 10 can not distinguish in the vicinity of which antenna is located near-field communication device with which it communicates. By against the processing module 10 is adapted to simultaneously exchange frames with several near-field communication devices present near one or more NFC antennas connected to the processing module 10, because the processing module 10 is equipped with an anti-collision protocol.
    Thus, the present invention advantageously allows simultaneous near-field communication over the first zone 12 and the second zone 13, with two separate near-field communication devices. The present invention has only one processing module 10 for several NFC antennas, so it is a very economical solution.
    Two distinct embodiments are possible for said antenna circuit 29: in a first embodiment illustrated in FIG. 1, the antenna circuit 29 is directly connected to the processing module 10, in a second embodiment illustrated in FIG. 2, the device 18 further comprises an active antenna 24, connected to the processing module 10, and the antenna circuit 29 is electromagnetically coupled with said active antenna 24, so that said antenna circuit 29 is connected to the processing module 10 via the active antenna 24.
    The operation of the system is similar for these two embodiments, but the embodiment comprising an active antenna 24 is preferred because it has a better electromagnetic operation and a better quality factor, and makes it possible to obtain a larger current in the second antenna 15 in the second zone 13, for the same power consumption.
    Each of the antennas mentioned here may be able to transmit and receive NFC signals to one or more near-field communication apparatuses.
    For this, in one embodiment, the antenna circuit 29 comprises a first capacitor 19 of capacitance adapted to ensure the resonance of the antenna circuit 29 at a resonance frequency adapted to the near-field communication.
    In one embodiment, said first capacitor 19 is arranged in the second near-field communication zone 13.
    In one embodiment, the antenna circuit 29 further comprises a second capacitor 23 arranged in the first zone 12, making it possible to improve the resonance of the antenna circuit 29.
    In one embodiment, the first antenna 14 and the second antenna 15 are interconnected by twisted wires 28. Said twisted wires 28, connecting the first zone 12 and the second NFC communication zone 13, make it possible to avoid coupling problems or magnetic induction.
    The near-field communication device 18 further comprises: a first presence detector 16 arranged in the first zone 12, and a second presence detector 17 arranged in the second zone 13.
    These presence detectors are electronic circuits adapted to provide a detection signal representative of the presence or absence of a near-field communication apparatus near the zone in which they are installed.
    In one embodiment, a presence detector comprises a capacitor, a resistor and a coil, forming a passive resonant circuit capable of generating a voltage induced by the effect of the fields emitted by an NFC device when there is one. near. The characteristic quantities of the electronic components present in a presence detector are intended to allow its resonance at a frequency adapted to near-field communication. A presence detector may further include a current rectifying diode bridge, taking as input the voltage across the passive resonant circuit mentioned above. In this case, the voltage at the output terminals of this rectifier bridge constitutes said detection signal representative of the presence or absence of a near-field communication apparatus near the zone in which the presence detector is installed. . This detection signal is the output of the presence detector.
    The near-field communication device 18 furthermore comprises a control circuit 11 adapted to place the antenna circuit 29 in at least two different operating modes: a first mode, referred to as a "functional mode", in which the circuit of FIG. antennas 29 allows communication in the near field, • a second mode, called "dysfunctional mode", in which the antenna circuit 29 does not allow communication in the near field, said control circuit 11 being configured to place the circuit of antennas 29 in the functional mode or in the dysfunctional mode as a function of detection signals provided by the first presence detector 16 and by the second presence detector 17.
    The output signals of the first presence detector 16 and the second presence detector 17 are connected to the input of the control circuit 11.
    It is necessary to establish selection priorities between the first zone 12 and the second zone 13 of near-field communication. This is the function of the control circuit 11. Generally, the control circuit 11 prohibits the device 18 any near-field communication when it places the antenna circuit 29 in dysfunctional mode.
    In one embodiment, said control circuit 11 is arranged in the second zone 13 and / or in the first zone 12. This means that the control circuit which manages the priorities between the zones is perfectly independent of the control module.
    For example, the control circuit 11 may be configured to place the antenna circuit 29 in the dysfunctional mode if and only if: • the detection signal provided by the first presence detector 16 indicates the presence of a communication apparatus in a near field near said first zone 12, and • the detection signal provided by the second presence detector 17 indicates the absence of a near-field communication apparatus near the second zone 13, the control circuit 11 being configured to place the antenna circuit 29 in the functional mode for all other detecting signal combinations provided by the first presence detector 16 and the second presence detector 17.
    In this example, let us summarize the operation of the control circuit 11, and the mode in which the antenna circuit 29 will be placed as a function of the presence or absence of near-field communications apparatus: near-field communication is present near the first zone 12 and no near-field communication apparatus is present near the second zone 13, then a voltage produced by the first presence detector 16 is inputted. of the control circuit 11, while the second presence detector 17 produces no voltage. In this case, the control circuit 11 places the antenna circuit 29 in dysfunctional mode. If a near-field communication apparatus is present near the first zone 12 and a near-field communication apparatus is present near the second zone 13, then a voltage produced by the first presence detector 16 is applied to the input of the control circuit 11, and a voltage produced by the second presence detector 17 is applied to the input of the control circuit 11. In this case, the control circuit 11 places the antenna circuit 29 in the functional mode. If no near-field communication apparatus is present near the first zone 12 and a near-field communication apparatus is present near the second zone 13, then no voltage is produced by the first zone 12; presence detector 16, while a voltage produced by the second presence detector 17 is applied to the input of the control circuit 11. In this case, the control circuit 11 places the antenna circuit 29 in a functional mode. If no near-field communication apparatus is present near the first zone 12 and no near-field communication apparatus is present near the second zone 13, then no voltage is produced by the first presence detector 16, and no voltage is produced by the second presence detector 17. In this case, the control circuit 11 places the antenna circuit 29 in the functional mode.
    In this example, the logic of prohibiting the use of the device 18 aims to make the second zone 13 of near field communication priority over the first zone 12, the second zone 13 will therefore advantageously arranged near the driver, in the where the device 18 would be installed on board a motor vehicle.
    The control circuit 11 can be realized in different ways. FIGS. 3 and 4 show two possible embodiments of said control circuit 11: in an embodiment illustrated in FIG. 3, the control circuit comprises a first switch 21 for short-circuiting the first capacitor 19 to that the antenna circuit 29 resonates at a frequency not adapted to the near-field communication, to place the antenna circuit 29 in dysfunctional mode, • in one embodiment illustrated in FIG. 4, the control circuit 11 comprises a first switch 21 adapted to open the antenna circuit 29 to place it in dysfunctional mode.
    In the embodiment illustrated in FIG. 3, said first switch 21 may for example be a transistor N whose source and drain are connected on either side of said first capacitor 19, its gate being connected to the drain of a second switch 22 which may be a transistor P. In this example, the source of said second switch 22 is connected to the output signal of the first presence detector 16, and the gate of said second switch is connected to the output signal of the second detector of presence 17.
    In the embodiment illustrated in FIG. 4, said first switch 21 may, for example, have a transistor P whose source and drain are electrically connected in series with the antenna circuit 29, its gate being connected to the output signal of the first presence detector 16. In this example, a second switch 22 has its source and its drain connected to the same points as the first switch 21 on the antenna circuit 29, the gate of said second switch 22 being connected to the output signal of the second presence detector 17. In this example, the second switch 22 is a transistor N.
    Transistor P is understood to mean a transistor which allows the current to flow between its source and its drain when its gate is not powered, and which isolates its source and its drain when its gate is energized. In one embodiment, the transistor P is of the PMOS or JFET type.
    Transistor N means a transistor which isolates its source and its drain when it is not powered, and which allows the current to flow between its source and its drain when it is powered. In one embodiment, the transistor N is of the NMOS type.
    This control circuit 11 enabling priority management of the antennas has the advantage of being simple, inexpensive, entirely hard hardware and independent of the processing module 10, thus avoiding the problems of reaction times and thresholds proper the use of software. In addition, the detection of presence of NFC objects being made at the first zone 12 and second zone 13 of near-field communication, and the dysfunctional mode of the antenna circuit 29 being made at the same place directly by the circuit 11 control, it is not necessary to connect the control circuit 11 with the processing module 10, which reduces the costs in terms of wiring.
    In one embodiment, devices adapted to provide other functionalities may be arranged in the second zone 13 or in the first zone 12, for example an induction wireless smartphone charger.
    In the case where the near-field communication device 18 is on board a motor vehicle, the communication between one or more near-field communication devices and the device 18 may have several uses: starting the motor vehicle with a smartphone equipped with a secure chip, telematic communication as the pairing of a smartphone to a motor vehicle calculator to allow the rapid introduction of a Bluetooth connection inside the cabin, or other applications.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    A near-field communication device (18) comprising: a processing module (10) and a first antenna (14) arranged in a first near-field communication zone (12) and connected to said processing module (10) A first presence detector (16) arranged in the first zone (12), characterized in that said device (18) further comprises: a second antenna (15) arranged in a second communication zone (13) near field, the first antenna (14) and the second antenna (15) being electrically in series and forming an antenna circuit (29), • a second presence detector (17) arranged in the second zone (13), • a control circuit (11) adapted to place the antenna circuit (29) in at least two different operating modes: - a first mode, called "functional mode" in which the antenna circuit (29) allows the communication in the near field, - a second mode, called "fashion in which the antenna circuit (29) does not permit near-field communication, said control circuit (11) being configured to place the antenna circuit (29) in the functional mode or in the dysfunctional mode based on detection signals provided by the first presence detector (16) and the second presence detector (17).
    [2" id="c-fr-0002]
    2. Device (18) according to claim 1, characterized in that the control circuit (11) is configured to place the antenna circuit (29) in the dysfunctional mode if and only if: • the detection signal provided by the first presence detector (16) indicates the presence of a near-field communication apparatus near said first zone (12), and • the detection signal provided by the second presence detector (17) indicates the absence near-field communication apparatus near the second zone (13), the control circuit (11) being configured to set the antenna circuit (29) in functional mode for all other combinations of detecting signals provided by the first presence detector (16) and the second presence detector (17).
    [3" id="c-fr-0003]
    3. Device (18) according to one of claims 1 to 2, characterized in that the antenna circuit (29) comprises a first capacitor (19) of capacity adapted to ensure the resonance of the antenna circuit (29) at a resonant frequency suitable for near-field communication.
    [4" id="c-fr-0004]
    4. Device (18) according to the claims, characterized in that the control circuit (11) comprises a first switch (21) for shorting the first capacitor (19) so that the antenna circuit (29) resonates at a frequency not adapted to the near-field communication, for placing the antenna circuit (29) in a dysfunctional mode.
    [5" id="c-fr-0005]
    5. Device (18) according to any one of claims 1 to 3, characterized in that the control circuit (11) comprises a first switch (21) adapted to open the antenna circuit (29) to place it in position. dysfunctional mode.
    [6" id="c-fr-0006]
    6. Device (18) according to any one of claims 3 to 5, characterized in that said first capacitor (19) is arranged in the second zone (13).
    [7" id="c-fr-0007]
    7. Device (18) according to claim 6, characterized in that the antenna circuit (29) further comprises a second capacitor (23) arranged in the first zone (12).
    [8" id="c-fr-0008]
    8. Device (18) according to any one of claims 1 to 7, characterized in that it further comprises an active antenna (24), connected to the processing module (10), and in that the circuit of antennas (29) is electromagnetically coupled with said active antenna (24), so that said antenna circuit (29) is connected to the processing module via the active antenna (24).
    [9" id="c-fr-0009]
    9. Device (18) according to any one of claims 1 to 7, characterized in that the antenna circuit (29) is connected directly to the processing module (10).
    [10" id="c-fr-0010]
    A motor vehicle having a near-field communication device (18) according to any one of claims 1 to 9.
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    KR20170131223A|2017-11-29|
    KR102311874B1|2021-10-12|
    US9887460B2|2018-02-06|
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    引用文献:
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    法律状态:
    2017-05-23| PLFP| Fee payment|Year of fee payment: 2 |
    2017-11-24| PLSC| Publication of the preliminary search report|Effective date: 20171124 |
    2018-05-22| PLFP| Fee payment|Year of fee payment: 3 |
    2019-05-23| PLFP| Fee payment|Year of fee payment: 4 |
    2020-05-22| PLFP| Fee payment|Year of fee payment: 5 |
    2021-05-20| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
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    FR1654443|2016-05-19|FR1654443A| FR3051578B1|2016-05-19|2016-05-19|NEAR FIELD COMMUNICATION DEVICE HAVING TWO NFC ZONES|
    KR1020170058883A| KR102311874B1|2016-05-19|2017-05-11|Near-field communication device comprising two nfc areas|
    US15/595,235| US9887460B2|2016-05-19|2017-05-15|Near-field communication device comprising two NFC areas|
    CN201710352711.9A| CN107453787B|2016-05-19|2017-05-18|Near field communication device comprising two NFC areas|
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