Importance

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Abstract

The present invention relates to methods and systems for power and energy transfer for non-contact IC cards, which is capable to communicate with an external device such as a host terminal. The disclosed method and system give the possibility to combine inductive coupling for remote power and data transmission, and capacitive coupling while IC card is attached to terminal, in order to transfer a large amount of energy. The new in the art is that bidirectional data and energy transfer from a terminal into an IC card is performing at two different carrier frequencies of an energy-transmitting alternating field. Herein the remote data transmission and energy transfer into the IC card is provided at first, lowest, frequency, utilizing the inductive coupling between a terminal transmitting-receiving coil and a IC card transmitting-receiving coil. Additionally, the close contactless energy and data transmission into the IC card is provided at second, higher, frequency utilizing the capacitive coupling between a terminal and IC card capacitive pads while IC card is attached to the terminal. The first frequency is designed to be a frequency of a parallel resonance combined by parallel alignment of an IC card inductive coil and a distributed capacitance of an IC card capacitive pads. The second frequency is designed to be a frequency of a series resonant circuit associated with series alignment of additional terminal inductance and joint capacitance of a terminal capacitive pads and IC card capacitive pads, when card is attached to terminal.

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First Claim