Patent Number: 6,168,083

Title: Chip-card with mode switching between contactless and contact-coupled mode

Abstract: A chip card is operable in a contactless and contact-coupled mode. For operation in the contactless mode, the chip card has an antenna coil and rectifier. In the contactless mode, the chip card receives an AC signal. The rectifier provides a rectified received AC signal. The rectified signal is used for powering internal circuitry of the chip card. The chip card further has a recognition circuit that recognizes whether an AC signal is actually received by the antenna coil. If the AC signal is recognized, the recognition circuit switches the chip card to the contactless mode. If no AC signal is recognized, the recognition circuit switches the chip card to the contact-coupled mode.

Inventors: Berger; Dominik (Graz, AT), Eber; Wolfgang (Graz, AT), Holweg; Gerald (Graz, AT)

Assignee: U.S. Philips Corporation

International Classification: G06K 19/07 (20060101); G06K 019/06 ()

Expiration Date: 01/02/2018