Method for detecting and controlling card stamping distance of radio-frequency card of mobile telephone

Abstract

The invention discloses a method for detecting and controlling the card stamping distance of a radio-frequency card of a mobile telephone. An induction coil is arranged on a plane in a POS machine of a payment terminal parallel to the card stamping face of the radio-frequency card of the mobile telephone; a preset high-frequency AC excitation signal is applied to both ends of the induction coil, and a sine alternating magnetic field is formed at the periphery of the induction coil; the mobile telephone with the radio-frequency card of the mobile telephone is close to the induction coil; the self metal substance of the mobile telephone generates vortex flow, and the vortex flow generates a new alternating magnetic field and causes the impedance of the induction coil to be changed; a voltage detection circuit is connected to both ends of the induction coil so as to detect the change of the voltage of the induction coil and obtain the value of the voltage of the induction coil; accordingto a corresponding relationship that the value of the voltage obtained by detection is smaller if the mobile telephone is closer to the induction coil, distance between the mobile telephone and the POS machine of the payment terminal can be obtained by detecting the value of the voltage; and then control is realized. The invention has the characteristics of simple method, easy realization, accurate detection and effective control.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a method for detecting and controlling the swiping distance of a mobile phone radio frequency card. Background technique [0002] With the rapid development of my country’s national economy, the people’s living standards have greatly improved, especially with the rapid development of mobile communication technology and with the development of market economy, the functions of mobile phones are increasing, and they are no longer limited to making calls and sending and receiving short messages. News, this also makes the application of mobile phones quite popular. Mobile phones have actually become an indispensable necessities in people's daily life, and they are also necessities to carry around. [0003] It is precisely because of the increasing role of mobile phones that mobile phones have begun to emerge as a means of mobile payment. From the perspective of security, when ...

AI Technical Summary

Problems solved by technology

From the perspective of security, when using a mobile phone for mobile payment, the card swiping distance of the mobile phone must be properly controlled. This distance is usually required to be within 5cm. If the card swiping distance is too far, it is easy to be stolen or mistakenly swiped.

[0004] The use of mobile phone radio frequency cards, that is, radio frequency mobile phone subscriber identification cards, is a more effective technical means to support mobile phone card swiping. However, due to the directionality, power level, and receiving sensitivity of radio frequency signals, it is difficult to accurately control. It is necessary to accurately detect and control the card swiping distance of mobile phones. , has been a problem

Thereby affecting the popularization and application of mobile payment with mobile phone radio frequency card

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