公开(公告)号：FR2792130B1

公开(公告)日：2001-11-16

申请号：FR9904547

申请日：1999-04-07

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN PIERRE

IPC: G08C17/00 ,  G01S13/75 ,  G01S13/76 ,  G01S13/79 ,  G06K7/00 ,  G06K17/00 ,  G06K19/07 ,  H02J17/00 ,  H04B1/59 ,  H04B7/14

Abstract: The transponder includes capacitor-transistor pairs (C3,K1,C4,K2) that produce an information when the transponder is close reading-writing terminal. The oscillating circuit of the transponder has a given frequency. The transmission of the information this position does not match since the frequency is higher than that of the oscillating circuit. An Independent claim is included for: (a) a system of data transmission

公开(公告)号：FR2792135B1

公开(公告)日：2001-11-02

申请号：FR9904548

申请日：1999-04-07

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN PIERRE

IPC: G06K7/00 ,  G06K19/07 ,  G01S13/74 ,  H04B1/59 ,  H04B5/02 ,  H04B7/14

Abstract: The coupling between transponder and terminal is reduced by altering the resonant frequency of either the terminal or transponder coupling circuits when the two are in close proximity. When the coupling is reduced, the data rate for the communication between terminal and transponder is automatically increased, which can be achieved because the coupling is effectively a transformer coupling.

公开(公告)号：FR2792132B1

公开(公告)日：2001-11-02

申请号：FR9904544

申请日：1999-04-07

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN PIERRE

IPC: G06K19/07 ,  G06K7/00 ,  G06K17/00 ,  H02J17/00 ,  H04B1/59 ,  H04B5/02 ,  H04B7/14

Abstract: The terminal (1) uses inductive coupling to read from and write to a transponder, and includes a resonant circuit (Li,Ci) tuned to receive an AC HF excitation voltage. The resonant frequency may be altered so as to detune the LC in the event that a transponder is very close to the terminal. A capacitor (24) may be controlled by a control circuit (21) and with impedance (Li) to detect a gap of phase in relation to the signal of REF reference and to modify the capacity Ci of the capacitor (24). An Independent claim is included for a contactless system of data transmission.

公开(公告)号：FR2804557A1

公开(公告)日：2001-08-03

申请号：FR0001214

申请日：2000-01-31

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC

IPC: G06K17/00 ,  G01S13/75 ,  G01S13/76 ,  G01S13/79 ,  G06K7/00 ,  H02J17/00 ,  H04B1/59 ,  H04B5/02

Abstract: A terminal for generating an electromagnetic field adapted to cooperating with at least one transponder when the latter enters its field and including an oscillating circuit adapted to receiving a high-frequency A.C. excitation voltage, circuitry for regulating the signal phase in the oscillating circuit with respect to a reference value, circuitry for determining an instantaneous information relative to the magnetic coupling between the transponder and the terminal, and circuitry for adapting the electromagnetic field power according to at least said present information.

公开(公告)号：FR2787655B1

公开(公告)日：2001-03-09

申请号：FR9816383

申请日：1998-12-21

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL

IPC: G01S13/78 ,  G06K19/07 ,  H04B1/59 ,  H04B5/02

Abstract: The transponder is of the type having an oscillating circuit (L2,C2) in front of a rectifier circuit (13) designed to produce a continuous voltage (Va) to an electronic circuit (17). The circuit (17) includes means for emitting digital data codes. The transponder has two capacitive modulation circuits (C2,K1; C4,K2) respectively associated with each end terminal of an inductive part (L2) of the oscillating circuit. A reference terminal of each modulating circuit is connected to a reference voltage (15) of the electronic circuit supply

公开(公告)号：DE69610456T2

公开(公告)日：2001-02-08

申请号：DE69610456

申请日：1996-05-06

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BAILLY ALAIN

IPC: H02M1/00 ,  H02M1/42 ,  H02M1/12 ,  H05B41/295

Abstract: The rectifying process involves utilising a number of capacitors (C1,C2) of progressively decreasing value, connected across a rectifier output, in series with resistors (R1,R2) of progressively decreasing value. The discharge of these capacitors is blocked during the initial phase of the fall in the AC voltage applied to the rectifier (D1-D4) after the maximum of the cycle. The duration of the blocking of the capacitors is longer for the smaller value capacitors. As soon as a capacitor is unblocked and can discharge the currently discharging capacitor is blocked. The timing is controlled by comparison of the potential across the DC rails at each stage with a set reference value.

公开(公告)号：DE69610456D1

公开(公告)日：2000-11-02

申请号：DE69610456

申请日：1996-05-06

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BAILLY ALAIN

IPC: H02M1/00 ,  H02M1/42 ,  H02M1/12 ,  H05B41/295

Abstract: The rectifying process involves utilising a number of capacitors (C1,C2) of progressively decreasing value, connected across a rectifier output, in series with resistors (R1,R2) of progressively decreasing value. The discharge of these capacitors is blocked during the initial phase of the fall in the AC voltage applied to the rectifier (D1-D4) after the maximum of the cycle. The duration of the blocking of the capacitors is longer for the smaller value capacitors. As soon as a capacitor is unblocked and can discharge the currently discharging capacitor is blocked. The timing is controlled by comparison of the potential across the DC rails at each stage with a set reference value.

公开(公告)号：AT196702T

公开(公告)日：2000-10-15

申请号：AT96410045

申请日：1996-05-06

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BAILLY ALAIN

IPC: H02M1/00 ,  H02M1/42 ,  H02M1/12 ,  H05B41/295

Abstract: The rectifying process involves utilising a number of capacitors (C1,C2) of progressively decreasing value, connected across a rectifier output, in series with resistors (R1,R2) of progressively decreasing value. The discharge of these capacitors is blocked during the initial phase of the fall in the AC voltage applied to the rectifier (D1-D4) after the maximum of the cycle. The duration of the blocking of the capacitors is longer for the smaller value capacitors. As soon as a capacitor is unblocked and can discharge the currently discharging capacitor is blocked. The timing is controlled by comparison of the potential across the DC rails at each stage with a set reference value.

公开(公告)号：FR2792137A1

公开(公告)日：2000-10-13

申请号：FR9907024

申请日：1999-05-31

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN PIERRE

IPC: G06K17/00 ,  G01S13/75 ,  G01S13/76 ,  G01S13/79 ,  G06K7/00 ,  G06K19/07 ,  H02J17/00 ,  H04B1/59 ,  H04L27/02 ,  H04B7/14

公开(公告)号：FR2792134A1

公开(公告)日：2000-10-13

申请号：FR9904546

申请日：1999-04-07

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC

IPC: B42D15/10 ,  G01S13/74 ,  G06K7/00 ,  G06K17/00 ,  G06K19/00 ,  G06K19/07 ,  G08C17/00 ,  H01Q7/00 ,  H04B7/14 ,  H04B1/59

Abstract: The distance between a smart card and terminal is measured by a circuit that compares the level of rectified (D) voltage in transponder when its receiver circuit (L2,C'2) is set to resonate at the terminal frequency with the rectified voltage when a capacitor (C3) is switched (K1) into the circuit to shift the transponder resonant frequency away from the excitation frequency.