SYSTEM FOR EXCHANGING DATA BY CONTACTLESS COMMUNICATION BETWEEN TERMINAL AND REMOTELY POWERED PORTABLE OBJECT

摘要

PPROBLEM TO BE SOLVED: To provide a system for exchanging data by contactless communication between a terminal and remotely powered portable objects. PSOLUTION: A terminal (100) includes a coil (102) co-operating with a data transmitter/receiver means (108-118). A portable object (200) includes a remotely powered electric circuit including: a coil (202) for picking up a modulated magnetic field from the terminal or for responding by producing the modulated disturbance of the magnetic field; a converter means including a rectifier stage (210) and a filter stage (212) transforming the magnetic field picked up by the coil into a DC power supply voltage (a); and a data transmitter/receiver means. The terminal includes a receiver including a means (218) for demodulating the amplitude of the signal picked up by the coil. PCOPYRIGHT: (C)2008,JPO&INPIT