Dual-interface user identification device and mobile terminal

Abstract

The invention discloses a dual-interface user identification device and a mobile terminal. The dual-interface user identification device includes: non-contact antenna, non-contact chip, user identification module, adjustable capacitor, and control circuit; The contact operation provides working energy; the non-contact antenna is connected in parallel with the adjustable capacitor to form a resonant circuit; the control circuit adjusts the capacitance value of the adjustable capacitor according to the capacitance input by the user, so that the resonant frequency of the resonant circuit is consistent with the The difference of the resonant frequency of the external electromagnetic signal is within a predetermined range. The solution provided by the invention enables the dual-interface user identification device to adapt to the resonant frequency of different card readers, so that the dual-interface user identification device can perform normal non-contact operation on different card readers.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a dual-interface user identification device and a mobile terminal. Background technique [0002] In recent years, with the increase of mobile communication users and the popularization of mobile terminals, more and more mobile terminal users want to use mobile terminals, such as mobile phones, to realize short-distance payment or card swiping applications. A dual-interface Subscriber Identity Module (SIM), also known as a dual-interface SIM card, provides a solution for such applications. [0003] The dual-interface SIM card can support both contact and non-contact working interfaces. Insert the dual-interface SIM card into the SIM card slot in the mobile terminal: the contact working interface realizes the traditional SIM card application and provides mobile communication functions; The non-contact working interface realizes non-contact application, for example, in the nea...

AI Technical Summary

Problems solved by technology

[0005] However, various types of card readers interacting with dual-interface SIM cards may be different, and the resonant frequency of these card readers is relatively high or low relative to the resonant frequency of the dual-interface SIM card oscillation circuit. This will cause the resonance between the dual-interface SIM card and the card reader may not be able to occur during the contactless work process, so that the dual-interface SIM card cannot work in the best state, and payment or card swiping errors may occur.

For example, the resonance frequency of the SIM card standard is 13.56Mhz. When the difference between the resonance frequencies of the two sides reaches 1-2Mhz, it is difficult to read the card correctly.

When the resonant frequency difference between the two sides is too large, it cannot even provide enough voltage to drive the contactless chip to complete the corresponding operation, which will cause the dual-interface SIM card to fail to perform contactless operation.

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