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WO1996018969A1 - Systeme de transmission de donnees sans contact - Google Patents

Systeme de transmission de donnees sans contact Download PDF

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Publication number
WO1996018969A1
WO1996018969A1 PCT/DE1995/001659 DE9501659W WO9618969A1 WO 1996018969 A1 WO1996018969 A1 WO 1996018969A1 DE 9501659 W DE9501659 W DE 9501659W WO 9618969 A1 WO9618969 A1 WO 9618969A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmitting
circuit
data carrier
data
receiving device
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/DE1995/001659
Other languages
German (de)
English (en)
Inventor
Robert Reiner
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO1996018969A1 publication Critical patent/WO1996018969A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/04—Arrangements for transmitting signals characterised by the use of a wireless electrical link using magnetically coupled devices
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/06—Arrangements for transmitting signals characterised by the use of a wireless electrical link using capacity 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
    • H04B5/22—Capacitive coupling

Definitions

  • the invention relates to a system for contactless data transmission by means of a device for loose inductive or capacitive coupling between a transmitting / receiving device and at least one portable data carrier arrangement, the transmission of data from the data carrier arrangement to the transmitting / receiving device using modulation of the carrier signal sent from the transmitting / receiving device to the data carrier arrangement by loading the secondary circuit of the coupling device and in the transmitting / receiving device demodulation takes place.
  • Such a data transmission system is known for example from EP 0 473 569 A2.
  • a transmitting coil of the transmitting / receiving device is fed by an oscillator.
  • the transmitting coil is loosely coupled to a receiving coil in a portable data carrier arrangement, so that an inductive transmission of energy from the transmitting / receiving device to the data carrier arrangement can take place.
  • This energy transfer takes place by means of a carrier signal which on the one hand functions as a clock signal and on the other hand serves as a carrier for data from the transmitting / receiving device to the data carrier arrangement.
  • the inductance or the ohmic load of the receiving coil can be changed, as a result of which the current in the secondary circuit of the coupling device and, depending on this, also the voltage at the transmitting coil of the primary circuit changes.
  • This change is determined by an amplitude demodulator.
  • This load modulation means that data can be transmitted from the data carrier arrangement to the transmitting / receiving device without the need for a further carrier signal.
  • the transmission behavior depends on the coupling factor between the primary and the secondary circuit of the coupling device. exercise. This in turn is a function of the distance between the transmitting / receiving device and the data carrier arrangement, which can be a contactless chip card, for example.
  • the basic dependence of the voltage at the transmitter coil of the primary circuit on the current through the secondary circuit is shown in FIG. In the usual circuit constellations for coupling devices, there is a transmission course which has a minimum.
  • the load on the secondary circuit which can be done both by changing the inductance of the coil, the value of a resistor or the capacitance of a tuning capacitor, the secondary current changes, for example, from a value I ⁇ to a larger value I2.
  • the value of the voltage on the primary circuit coil will deviate from a value Ui result in a smaller value U2, which can be detected by means of an amplitude demodulator.
  • the object of the invention is therefore to provide a data transmission system in which a change in load can always be detected.
  • the object is achieved by a data transmission system according to claim 1.
  • Advantageous further developments are specified in the subclaims.
  • phase demodulation circuit has the advantage that in the case of a load modulation around the minimum of the UI characteristic and thus in the case of a minimal or even vanishing amplitude change on the primary circuit coil, the phase change of the voltage on the primary circuit coil exhibits a maximum .
  • the amplitude is additionally demodulated and in a further development a device is provided which simultaneously evaluates the amounts of the detected amplitude and phase changes, so that a demodulated output signal which can be easily evaluated is always generated.
  • a particular advantage of such a system in which only the alternating field built up by the primary circuit is modulated by the data carrier arrangement, is that the modulation oscillations are derived directly from the primary oscillation and are therefore in a fixed frequency and phase relationship.
  • This can be used advantageously by using the oscillation of the transmit oscillator as a reference for the demodulation.
  • This allows simple and known circuits to be used, e.g. controlled rectifiers, EXOR gates, quadrature demodulators or multipliers.
  • the use of the oscillation of the transmit oscillator as a reference has the advantage that the frequency selection can be improved in a simple manner.
  • Show 1 shows a basic circuit of a data transmission system according to the invention
  • Figure 2 shows the basic course of a U-I transfer characteristic.
  • the transmission oscillator of the transmission / reception device is represented by a voltage source Uo. This feeds a series resonant circuit from a resistor Rp, a capacitor Cp and a coil Lp, which forms the primary inductance of a loosely coupled transformer.
  • the secondary circuit of this inductive coupling device is formed by a parallel resonant circuit with a secondary coil formed by an inductance Lg, a capacitor Cg and a resistor Rg.
  • a variable resistor Ry and a variable capacitor Cy are connected in parallel to this parallel resonant circuit.
  • this voltage is supplied both to a phase demodulator circuit P and, in a further development of the invention, to an amplitude demodulator A.
  • the output signals of these demodulators A, P can either be evaluated separately and, for example, the larger signal of the two can be used for further processing, or but are fed to a device 3 which evaluates the amounts of the two output signals simultaneously and thus always provides a good output signal for further processing of the data from the portable data carrier arrangement.
  • the voltage UQ of the oscillator and the voltage UL of the primary circuit coil are supplied to the phase demodulator circuit P as a reference signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

Un système de transmission de données sans contact utilise un dispositif de couplage inductif ou capacitif lâche entre un dispositif émetteur/récepteur et au moins un support portatif de données. Afin de démoduler une modulation de charge lors de la transmission de données du support de données au dispositif émetteur/récepteur, on utilise au moins un circuit démodulateur de phases (P) ou un tel circuit associé à un démodulateur d'amplitudes (A). On peut ainsi éviter les points de passage à zéro et de renversement de phase du signal démodulé dans la plage de travail.
PCT/DE1995/001659 1994-12-16 1995-11-24 Systeme de transmission de donnees sans contact Ceased WO1996018969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4444984A DE4444984C1 (de) 1994-12-16 1994-12-16 System zur kontaktlosen Datenübertragung
DEP4444984.4 1994-12-16

Publications (1)

Publication Number Publication Date
WO1996018969A1 true WO1996018969A1 (fr) 1996-06-20

Family

ID=6536064

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001659 Ceased WO1996018969A1 (fr) 1994-12-16 1995-11-24 Systeme de transmission de donnees sans contact

Country Status (2)

Country Link
DE (1) DE4444984C1 (fr)
WO (1) WO1996018969A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000341884A (ja) * 1999-04-07 2000-12-08 Stmicroelectronics Sa 非常に密な結合で動作する電磁トランスポンダ
AT501055B1 (de) * 2005-04-07 2006-06-15 Univ Graz Tech Verfahren zur demodulation und lesegerät zur auswertung lastmodulierter signale
US7751860B2 (en) 2004-01-14 2010-07-06 Peter Symons Variable configuration apparatus
US8290463B2 (en) 2009-09-14 2012-10-16 ConvenientPower HK Ltd. Universal demodulation and modulation for data communication in wireless power transfer

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19637964A1 (de) * 1996-09-18 1998-03-19 Diehl Ident Gmbh Einrichtung zum induktiven hochfrequenten Datenaustausch
NL1006493C2 (nl) * 1997-07-04 1999-01-05 Hedon Electronic Developments Systeem voor het contactloos elektronisch uitwisselen van gegevens, alsmede lees/schrijfeenheid en drager bestemd voor toepassing in een dergelijk systeem.
FR2790154A1 (fr) * 1999-02-23 2000-08-25 Innovatron Electronique Borne de communication sans contact par induction avec des objets portatifs, comportant un detecteur a demodulation de phase
FR2792136B1 (fr) 1999-04-07 2001-11-16 St Microelectronics Sa Transmission en duplex dans un systeme de transpondeurs electromagnetiques
US7049935B1 (en) 1999-07-20 2006-05-23 Stmicroelectronics S.A. Sizing of an electromagnetic transponder system for a dedicated distant coupling operation
FR2796781A1 (fr) * 1999-07-20 2001-01-26 St Microelectronics Sa Dimensionnement d'un systeme a transpondeur electromagnetique pour un fonctionnement en hyperproximite
FR2796782A1 (fr) * 1999-07-20 2001-01-26 St Microelectronics Sa Dimensionnement d'un systeme a transpondeur electromagnetique pour un fonctionnement dedie en couplage lointain
FR2808942B1 (fr) 2000-05-12 2002-08-16 St Microelectronics Sa Validation de la presence d'un transpondeur electromagnetique dans le champ d'un lecteur a demodulation de phase
US20030169169A1 (en) 2000-08-17 2003-09-11 Luc Wuidart Antenna generating an electromagnetic field for transponder
DE102008011582B4 (de) * 2008-02-28 2012-10-31 Sew-Eurodrive Gmbh & Co. Kg Datenübertragungseinrichtung und Anlage
US8339139B2 (en) 2010-01-29 2012-12-25 Infineon Technologies Ag System and method for testing a circuit
US8660489B2 (en) 2010-01-29 2014-02-25 Infineon Technologies Austria Ag System and method for receiving data across an isolation barrier
JP5443650B2 (ja) 2010-04-06 2014-03-19 ヴェーデクス・アクティーセルスカプ モニタリング装置，およびモニタリング装置における無線データおよび電力の送信方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654658A (en) * 1984-08-03 1987-03-31 Walton Charles A Identification system with vector phase angle detection
US4656472A (en) * 1985-01-23 1987-04-07 Walton Charles A Proximity identification system with power aided identifier
EP0312168A1 (fr) * 1987-10-12 1989-04-19 N.V. Nederlandsche Apparatenfabriek NEDAP Méthode et appareil pour identifier électroniquement des articles avançant le long d'une surface
EP0473569A2 (fr) * 1990-08-23 1992-03-04 Mikron Gesellschaft Für Integrierte Mikroelektronik Mbh Système de transmission de données par voie inductive sans contact

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654658A (en) * 1984-08-03 1987-03-31 Walton Charles A Identification system with vector phase angle detection
US4656472A (en) * 1985-01-23 1987-04-07 Walton Charles A Proximity identification system with power aided identifier
EP0312168A1 (fr) * 1987-10-12 1989-04-19 N.V. Nederlandsche Apparatenfabriek NEDAP Méthode et appareil pour identifier électroniquement des articles avançant le long d'une surface
EP0473569A2 (fr) * 1990-08-23 1992-03-04 Mikron Gesellschaft Für Integrierte Mikroelektronik Mbh Système de transmission de données par voie inductive sans contact

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000341884A (ja) * 1999-04-07 2000-12-08 Stmicroelectronics Sa 非常に密な結合で動作する電磁トランスポンダ
US7751860B2 (en) 2004-01-14 2010-07-06 Peter Symons Variable configuration apparatus
US8306583B2 (en) 2004-01-14 2012-11-06 J.M. Stanneck, Limited Liability Company Variable configuration apparatus
AT501055B1 (de) * 2005-04-07 2006-06-15 Univ Graz Tech Verfahren zur demodulation und lesegerät zur auswertung lastmodulierter signale
WO2006105565A1 (fr) * 2005-04-07 2006-10-12 Technische Universität Graz Procede pour la demodulation et lecteur pour evaluer des signaux a modulation de charge
US8290463B2 (en) 2009-09-14 2012-10-16 ConvenientPower HK Ltd. Universal demodulation and modulation for data communication in wireless power transfer

Also Published As

Publication number Publication date
DE4444984C1 (de) 1995-12-14

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