Data exchange system by contactless communication between a...

G - Physics – 06 – K

Patent

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Details

G06K 19/07 (2006.01) G06K 7/08 (2006.01) G07C 9/00 (2006.01) G07B 15/00 (2006.01)

Patent

CA 2245912

The terminal (100) comprises a coil (102) co-operating with data transmitting/receiving means (108-118). The portable object (200) comprises a remote powered electric circuit including: a coil (202), for picking up the modulated magnetic field derived from the terminal or for generating in response a modulated pick-up in this magnetic field; converting means, comprising a rectifying stage (210) and a filtering stage (212), transforming the magnetic field picked up by the coil and a direct voltage supply (<u>d</u>); and data transmitting/receiving means, the receiving means comprising means (218) for demodulating the amplitude of the signal picked up by the coil, these amplitude demodulating means operating on the signal (<u>b</u>) delivered in output of the rectifying and filtering stages. The coils (102, 202) each form part of a tuned resonant circuit (106, 208) radiating the field in free space. The amplitude modulation is a slight depth modulation, with a modulation rate typically not more than 50 %.

La borne (100) comporte une bobine (102) coopérant avec des moyens d'émission/réception de données (108-118). L'objet portatif (200) comporte un circuit électrique téléalimenté comprenant: une bobine (202), pour capter le champ magnétique modulé issu de la borne ou pour produire en réponse une perturbation modulée de ce champ magnétique; des moyens convertisseurs, comprenant un étage de redressement (210) et un étage de filtrage (212), transformant le champ magnétique capté par la bobine en une tension continue d'alimentation (d); et des moyens d'émission/réception de données, les moyens de réception comportant des moyens (218) démodulateurs de l'amplitude du signal capté par la bobine, ces moyens démodulateurs d'amplitude opérant sur le signal (b) délivré en sortie des étages de redressement et de filtrage. Les bobines (102, 202) font chacune partie d'un circuit résonnant accordé (106, 208) rayonnant le champ en espace libre. La modulation d'amplitude est une modulation à faible profondeur, avec un taux de modulation typiquement inférieur ou égal à 50 %.

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