Inductive coupling reader comprising means for extracting a...

Details Inductive coupling reader comprising means for extracting a... Inductive coupling reader comprising means for extracting a...

2005-12-13

2010-02-23

Le, Thien M. (Department: 2887)

Registers

Coded record sensors

Particular sensor structure

C235S492000, C235S493000

Reexamination Certificate

active

07665664

ABSTRACT:
The present invention relates to a method for supplying a power supply voltage (Vccr) to a contactless integrated circuit reader (RD1) that is in a passive operating mode, in the presence of an external alternating magnetic field (FLD2), the reader comprising an antenna circuit (ACT) substantially tuned to a working frequency (F0). According to the present invention, the method comprises the steps of taking off in the antenna circuit (ACT) an alternating voltage (Vcd) induced in the antenna circuit by the external magnetic field (FLD2), and rectifying the induced voltage to supply an auxiliary supply voltage (Vccr).

REFERENCES:
patent: 5874725 (1999-02-01), Yamaguchi
patent: 6158656 (2000-12-01), Matsumoto et al.
patent: 6540147 (2003-04-01), Charrat
patent: 7064716 (2006-06-01), Deguchi et al.
patent: 2003/0169152 (2003-09-01), Charrat et al.
patent: 2 406 023 (2005-03-01), None
patent: 2005057481 (2005-06-01), None

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