WO2020052923A1 - Capteur de poignée de porte capacitif comprenant une antenne pour une communication en champ proche - Google Patents

Capteur de poignée de porte capacitif comprenant une antenne pour une communication en champ proche Download PDF

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Publication number
WO2020052923A1
WO2020052923A1 PCT/EP2019/072332 EP2019072332W WO2020052923A1 WO 2020052923 A1 WO2020052923 A1 WO 2020052923A1 EP 2019072332 W EP2019072332 W EP 2019072332W WO 2020052923 A1 WO2020052923 A1 WO 2020052923A1
Authority
WO
WIPO (PCT)
Prior art keywords
capacitive sensor
antenna
nfc
capacitive
sensor electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2019/072332
Other languages
German (de)
English (en)
Inventor
Jörg Schulz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IFM Electronic GmbH
Original Assignee
IFM Electronic GmbH
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 IFM Electronic GmbH filed Critical IFM Electronic GmbH
Publication of WO2020052923A1 publication Critical patent/WO2020052923A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/94084—Transmission of parameters among sensors or between sensor and remote station
    • H03K2217/94089—Wireless transmission

Definitions

  • the invention relates to a capacitive sensor with a capacitive sensor electrode and an antenna which surrounds the capacitive sensor electrode or which is arranged in the immediate vicinity thereof and is suitable for near field communication (NFC), and its antenna
  • Control elements accessible to the user are increasingly being equipped with intelligent functions, particularly in the automotive sector. This is especially true for the
  • NFC Near field communication
  • Bluetooth or other systems in the same place, which enables additional functionalities such as the use of virtual car keys in the form of a password stored on the smartphone.
  • the capacitive sensors are to be used in addition to a wireless communication system, e.g. NFC, can be accommodated in the same housing.
  • the NFC antenna which is usually in the form of an inexpensive, multi-turn conductor loop, works best when there is as little metal surface in the magnetic field as possible, which impedes field propagation.
  • metal surfaces are essential due to the sensor electrodes of the capacitive sensor system.
  • the capacitive sensor electrode in turn, can build up the required electrical field much worse if, for example, a surrounding ground surface is present in the direct vicinity of the electrode, which concentrates the field line course at very small distances. If, for example, an NFC antenna surrounds the capacitive electrode in a ring, this has a similar effect to one for the capacitive sensor
  • a door handle arrangement for a motor vehicle is known from DE 10 2013 102 701 A1, in which the NFC antenna is used by means of electronic switches either in NFC mode for near-field communication or as a capacitive sensor electrode.
  • a disadvantage is the additional circuitry for the switching device, which can also cause additional resonant circuit damping, detuning and voltage limitation in NFC operation.
  • DE 101 63 778 A1 proposes an arrangement in which the switching device is dispensed with, but without avoiding the capacitive load on the sensor electrode caused by the coupling circuit of the antenna, which is extremely unfavorable for the capacitive sensor.
  • a combination of an NFC system and a capacitive proximity sensor in which the NFC antenna is used in two different operating modes.
  • the proximity sensor is coupled to a connection of the antenna and then used as a capacitive sensor electrode.
  • the NFC antenna represents an "open end" for the capacitive sensor and a "closed end” for the NFC mode.
  • the capacitive load on the NFC coupling circuit is also disadvantageous for the sensor.
  • DE 10 2014 218 213 A1 discloses a communication device for a keyless vehicle access, in which the operating parameters of the antenna are evaluated, the antenna itself serving as a sensor. Since the antenna is usually designed as an inductive component, essentially only changes in the inductance can be evaluated, which can be influenced by metal objects, but which is unsuitable for the detection of human body parts.
  • EP 1 795 860 B1 discloses a combined system in a vehicle handle, in which the antenna coil for data communication is simultaneously connected at one end to a capacitive sensor system, the antenna coil being coupled via a parasitic capacitance to an electrically conductive core, which acts as an extended sensor electrode serves.
  • the relatively large capacity of the coupling network is disadvantageous for NFC applications.
  • a sensor arrangement with a capacitive sensor device and a near-field transmission device is known, a turn 22 of a near-field transmission coil 21 rotating on a single-layer printed circuit board 30, which is coupled to control electronics 40.
  • a sensor electrode 1 1 is coupled, which has a central conductor 1 1.2 and a plurality Branch conductors 1 1.1, wherein, if the capacitive sensor device is configured for capacitive detection, a potential deviating from a ground potential is then applied for cooperative control of the near-field transmission coil.
  • the object of the invention is seen to significantly improve the function of the capacitive sensor system in confined spaces, for example in a (motor vehicle) door handle, that is to say to increase the sensory sensitivity without impairing the function of the NFC system.
  • Claim 2 relates to an advantageous embodiment and the independent claim 3 to its intended
  • the center tap of the NFC antenna is proposed as
  • the main advantage is that the previously disruptive NFC antenna now acts as an auxiliary electrode. It displaces the electrical field lines in the edge areas of the sensor electrode 2, so that they now pass through a larger area and the hand of a user can be detected at a greater distance when trying to access.
  • Fig. 1 shows the prior art
  • Fig. 2 shows the arrangement according to the invention
  • FIG. 1 schematically shows a combined system with a capacitive sensor 1 and an NFC antenna 3 enclosing the capacitive sensor electrode 2, which in turn is connected to an NFC IC via an EMC filter 7 via a common coupling network 5 known from the relevant literature 6 is connected, which works in a symmetrical operating mode because of the efficient use of energy.
  • the capacitive sensor electrode 2 is severely restricted in its function by the enclosing NFC antenna 3, since this is the electrical structure built up by the electrode 2 Shielded field and restricted to very small distances. This is often no longer sufficient for a convenient operating function.
  • the center tap 4 of the NFC antenna 3 is used as a feed point for an auxiliary signal that is synchronized with the measurement signal of the sensor electrode 2, so that the metal surface of the NFC antenna 3 becomes an actively driven shield electrode, which no longer hinders field propagation , but additionally supported.
  • the capacitive sensor electrode is advantageous as an open grid structure without a closed one
  • the center tap of the NFC antenna 4 is usually not used at all, and otherwise does not lead to NFC radio frequency in the case of symmetrical NFC transmission operation, since the two electrical halves of the symmetrically operated NFC antenna represent two partial inductors and carry an antiphase voltage. Therefore, this point 4 can either be grounded or can remain unconnected.
  • any other impedance that is effective in common mode can also be set at this point without changing the operating parameters of the antenna for symmetrical NFC operation. This property naturally assumes the symmetrical operation of the antenna and the presence of a center tap.
  • this point (4) is acted upon by an auxiliary signal which is useful for the function of the capacitive sensor and which is synchronized with the actual measurement signal on the sensor electrode.
  • this auxiliary signal is of no importance for the function of the NFC system, since the high-frequency voltage is zero at this point in NFC operation.
  • R and C can therefore take on useful values for the operation of the auxiliary electrode without influencing the adaptation network 5 in the NFC function. In this way, the desired slope of the synchronous auxiliary signal, which is not necessarily identical to the sensor signal, can be set.
  • the capacitive sensor electrode 2 and the NFC antenna 3 can also be arranged in close proximity to one another without departing from the inventive concept.
  • Reference list

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Lock And Its Accessories (AREA)

Abstract

Capteur capacitif (1) comprenant une électrode de capteur capacitive (2) et une antenne (3) adaptée pour la communication en champ proche (NFC), entourant l'électrode de capteur capacitive (2) ou disposée à proximité immédiate de celle-ci, laquelle comprend une prise centrale (4) et est reliée à travers un réseau d'adaptation (5) à un émetteur-récepteur NFC (6) à fonctionnement symétrique, la prise centrale (4) de l'antenne NFC (3) recevant selon l'invention un signal auxiliaire synchronisé au signal de mesure du capteur capacitif (1).
PCT/EP2019/072332 2018-09-12 2019-08-21 Capteur de poignée de porte capacitif comprenant une antenne pour une communication en champ proche Ceased WO2020052923A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018122254.8 2018-09-12
DE102018122254.8A DE102018122254B3 (de) 2018-09-12 2018-09-12 Kapazitiver Türgriffsensor mit einer Antenne zur Nahfeldkommunikation

Publications (1)

Publication Number Publication Date
WO2020052923A1 true WO2020052923A1 (fr) 2020-03-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/072332 Ceased WO2020052923A1 (fr) 2018-09-12 2019-08-21 Capteur de poignée de porte capacitif comprenant une antenne pour une communication en champ proche

Country Status (2)

Country Link
DE (1) DE102018122254B3 (fr)
WO (1) WO2020052923A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117999591A (zh) * 2021-09-16 2024-05-07 纬湃科技有限公司 具有由天线包围的电极的用于控制对机动车辆的进入的传感器
US12476369B2 (en) 2023-12-21 2025-11-18 Strattec Security Corporation Near field communication antenna module

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020102914A1 (de) * 2020-02-05 2021-08-05 Huf Hülsbeck & Fürst Gmbh & Co. Kg Sensorvorrichtung sowie Verfahren hierzu
DE102020102972A1 (de) * 2020-02-05 2021-08-05 Huf Hülsbeck & Fürst Gmbh & Co. Kg Sensorvorrichtung
EP3945501B1 (fr) 2020-07-31 2023-05-03 Continental Automotive Technologies GmbH Système d'accès
FR3131002B1 (fr) 2021-12-16 2024-03-29 Vitesco Technologies Dispositif de détection de présence avec antenne radiofréquence, pour un véhicule automobile.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163778A1 (de) 2001-06-27 2003-01-23 Witte Velbert Gmbh & Co Kg Griff mit integrierter Antenne und Sensorelektrode
EP1795860A1 (fr) 2004-09-28 2007-06-13 Aisin Seiki Kabushiki Kaisha Ensemble d'antenne et unité de poignée de porte
US20100315389A1 (en) * 2009-06-12 2010-12-16 Qualcomm Incorporated Devices and methods related to a display assembly including an antenna
WO2013137892A1 (fr) 2012-03-15 2013-09-19 Intel Corporation Communication par champ proche (nfc) et capteur de proximité pour dispositifs portables
DE102013102701A1 (de) 2013-03-18 2014-09-18 Huf Hülsbeck & Fürst Gmbh & Co. Kg Türgriffanordnung für ein Kraftfahrzeug mit kapazitivem Näherungssensor und NFC-Sende-/Empfangseinheit
US20150028864A1 (en) * 2013-07-29 2015-01-29 Hu Shan Auto Parts Inc. Vehicle door handle and sensor device thereof
DE102014218213A1 (de) 2014-09-11 2016-03-17 Continental Automotive Gmbh Anordnung und Verfahren zum Detektieren der Annäherung eines Objektes
EP3016295A1 (fr) * 2014-10-31 2016-05-04 Semtech Corporation Procédé et dispositif de communication en champ proche capacitif dans des dispositifs mobiles
DE102018106771A1 (de) 2017-03-30 2018-10-04 Huf Hülsbeck & Fürst Gmbh & Co. Kg Sensoranordnung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163778A1 (de) 2001-06-27 2003-01-23 Witte Velbert Gmbh & Co Kg Griff mit integrierter Antenne und Sensorelektrode
EP1795860A1 (fr) 2004-09-28 2007-06-13 Aisin Seiki Kabushiki Kaisha Ensemble d'antenne et unité de poignée de porte
US20100315389A1 (en) * 2009-06-12 2010-12-16 Qualcomm Incorporated Devices and methods related to a display assembly including an antenna
WO2013137892A1 (fr) 2012-03-15 2013-09-19 Intel Corporation Communication par champ proche (nfc) et capteur de proximité pour dispositifs portables
DE102013102701A1 (de) 2013-03-18 2014-09-18 Huf Hülsbeck & Fürst Gmbh & Co. Kg Türgriffanordnung für ein Kraftfahrzeug mit kapazitivem Näherungssensor und NFC-Sende-/Empfangseinheit
US20150028864A1 (en) * 2013-07-29 2015-01-29 Hu Shan Auto Parts Inc. Vehicle door handle and sensor device thereof
DE102014218213A1 (de) 2014-09-11 2016-03-17 Continental Automotive Gmbh Anordnung und Verfahren zum Detektieren der Annäherung eines Objektes
EP3016295A1 (fr) * 2014-10-31 2016-05-04 Semtech Corporation Procédé et dispositif de communication en champ proche capacitif dans des dispositifs mobiles
DE102018106771A1 (de) 2017-03-30 2018-10-04 Huf Hülsbeck & Fürst Gmbh & Co. Kg Sensoranordnung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117999591A (zh) * 2021-09-16 2024-05-07 纬湃科技有限公司 具有由天线包围的电极的用于控制对机动车辆的进入的传感器
US20240413525A1 (en) * 2021-09-16 2024-12-12 Vitesco Technologies GmbH Sensor for controlling access to a motor vehicle, having an electrode surrounded by an antenna
US12476369B2 (en) 2023-12-21 2025-11-18 Strattec Security Corporation Near field communication antenna module

Also Published As

Publication number Publication date
DE102018122254B3 (de) 2019-12-12

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