WO2011020326A1 - 一种检测、控制手机射频卡刷卡距离的方法及装置 - Google Patents

一种检测、控制手机射频卡刷卡距离的方法及装置 Download PDF

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Publication number
WO2011020326A1
WO2011020326A1 PCT/CN2010/071463 CN2010071463W WO2011020326A1 WO 2011020326 A1 WO2011020326 A1 WO 2011020326A1 CN 2010071463 W CN2010071463 W CN 2010071463W WO 2011020326 A1 WO2011020326 A1 WO 2011020326A1
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Prior art keywords
mobile phone
card
induction coil
payment terminal
distance
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PCT/CN2010/071463
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English (en)
French (fr)
Inventor
李健诚
邵威烈
赵成武
蓝先春
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厦门盛华电子科技有限公司
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Publication of WO2011020326A1 publication Critical patent/WO2011020326A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • G07F7/0873—Details of the card reader
    • G07F7/0893—Details of the card reader the card reader reading the card in a contactless manner

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  • the present invention relates to the field of communication technologies, and in particular, to a method and device for detecting and controlling the distance of a mobile phone RF card.
  • Mobile phones have emerged as a means of mobile payment. For security reasons, mobile phones must be used to control the mobile phone's card-swapping distance. This distance is usually required to be 5cm. Within a distance, the distance of the card is too easy to be stolen or accidentally brushed.
  • mobile phone RF card that is, the RF mobile phone user identification card is a relatively effective technical means to support mobile phone card swiping.
  • due to the directionality, power size, and sensitivity of the RF signal it is difficult to accurately control, and it is necessary to accurately detect and control the card swipe distance of the mobile phone. It has always been a problem. This has affected the promotion and application of mobile payment with mobile phones with mobile phone RF cards.
  • the object of the present invention is to overcome the deficiencies of the prior art, and to provide a method and a device for detecting and controlling the distance of the radio frequency card of the mobile phone, which is to use the metal material contained in the mobile phone when the card is swiped and close to the induction coil of the card swiping machine.
  • the inductance of the coil will have an influence. This effect is used to detect the exact distance between the mobile phone and the credit card machine, and then the control of the card swipe distance is realized.
  • the method has the advantages of simple method, easy implementation, accurate detection and effective control.
  • the technical solution adopted by the present invention to solve the technical problem thereof is: a method for detecting the distance of the mobile phone RF card swipe, comprising:
  • An induction coil is disposed on a plane parallel to the surface of the mobile phone RF card in the payment terminal POS; a preset high frequency AC excitation signal is applied to both ends of the induction coil, and the high frequency AC excitation signal causes the induction coil Forming a sinusoidal alternating magnetic field around the periphery; placing a mobile phone with a mobile phone radio frequency card close to the induction coil; subject to the sinusoidal alternating magnetic field, the metal material of the mobile phone itself generates eddy current, and the eddy current generates a new alternating a magnetic field, the new alternating magnetic field causes a change in impedance of the induction coil; a voltage detecting circuit is connected across the induction coil to detect a change in its voltage and obtain a voltage value thereof; The corresponding relationship between the voltage value detected by the induction coil is smaller, and the distance between the mobile phone and the payment terminal POS can be obtained by detecting the voltage value.
  • the induction coil is newly added in the payment terminal POS machine.
  • the induction coil is an existing RFID-sensing antenna coil in a payment terminal POS machine.
  • a method for controlling the distance of a mobile phone RF card including parameter setting and actual control:
  • a voltage detecting circuit is connected to both ends of the induction coil to detect a change in voltage thereof and obtain a voltage value thereof, and the voltage value is subjected to analog/digital conversion by an A/D converter and then sent to a computer of a payment terminal POS machine for processing. Processing by the system, processed by the computer processing system into data corresponding to a known distance;
  • step d Continuously changing the known distance of the mobile phone of the mobile phone radio frequency card to the payment terminal POS machine, and repeating step c to obtain data corresponding to the known distance between the mobile phone of the plurality of mobile phone radio frequency cards and the payment terminal POS machine;
  • step g Providing an induction coil identical to step a in a plane position parallel to the surface of the mobile phone RF card in the payment terminal POS, and applying a high frequency AC excitation signal to the induction coil that is the same as step a, so that the induction
  • the coil forms a sinusoidal alternating magnetic field at its periphery;
  • a voltage detecting circuit is connected to both ends of the induction coil
  • the voltage detecting circuit detects the voltage across the induction coil and acquires a detection voltage value, which is subjected to analog/digital conversion by an A/D converter and then sent to a computer processing system of the payment terminal POS machine to process the corresponding detection data. ;
  • the computer processing system determines whether the detected data is greater than the distance threshold; when the determination is yes, returns to step j; when the determination is no, proceeds to the next step;
  • the computer processing system sends a control instruction to the radio frequency receiving module of the payment terminal POS machine to agree to receive the radio frequency signal for payment by the radio frequency of the mobile phone radio frequency card.
  • the induction coil is newly added in the payment terminal POS machine.
  • the induction coil is an existing RFID-sensing antenna coil in a payment terminal POS machine.
  • the invention has the beneficial effects that an induction coil is disposed on a plane parallel to the surface of the mobile phone RF card in the payment terminal POS machine; and a preset high frequency AC excitation signal is applied to both ends of the induction coil.
  • the frequency alternating excitation signal causes the induction coil to form a sinusoidal alternating magnetic field at its periphery; the mobile phone with the mobile phone radio frequency card is placed close to the induction coil; and the metal material of the mobile phone itself generates eddy current due to the sinusoidal alternating magnetic field The eddy current generates a new alternating magnetic field, which causes the impedance of the induction coil to change; a voltage detecting circuit is connected across the induction coil to detect a change in its voltage and acquire it The voltage value is obtained according to the corresponding relationship that the voltage value detected by the mobile phone is closer to the induction coil, and the distance between the mobile phone and the payment terminal POS machine can be obtained by detecting the voltage value; further, using the detection center The accurate distance is obtained to realize the control of
  • the method is based on the principle of electromagnetism.
  • the metal material contained in the mobile phone is used in the card-swapping operation and close to the induction coil of the card-spinning machine, the inductance of the induction coil is affected, and the influence is used to detect the mobile phone and the credit card machine.
  • the accurate distance between them, and further control the distance of the mobile phone has the characteristics of simple method, easy implementation, accurate detection and effective control.
  • Figure 1 is a schematic diagram of electromagnetic induction utilized by the present invention
  • FIG. 2 is a schematic diagram of an equivalent circuit of electromagnetic induction utilized by the present invention.
  • Figure 3 is a schematic diagram of a voltage detecting circuit of the present invention.
  • FIG. 4 is a schematic view of an induction coil of the dual frequency card reading device of the present invention.
  • FIG. 5 is a schematic illustration of the manner of use of the present invention.
  • a method for detecting the distance of a mobile phone RF card is to provide an induction coil on a plane parallel to the surface of the mobile phone RF card in the payment terminal POS; one end is applied to the two ends of the induction coil a preset high frequency alternating current excitation signal, the high frequency alternating current excitation signal causing the induction coil to form a sinusoidal alternating magnetic field at its periphery; a mobile phone with a mobile phone radio frequency card is placed close to the induction coil; The influence of the magnetic field, the metal material of the mobile phone itself generates an eddy current, which in turn generates a new alternating magnetic field, the new alternating magnetic field causes the impedance of the induction coil to change; and a voltage detecting circuit is connected to the induction coil.
  • the two ends detect the change of the voltage and obtain the voltage value thereof; according to the corresponding relationship that the voltage value detected by the mobile phone is closer to the induction coil, the mobile phone and the payment terminal POS can be obtained by
  • an induction coil can be added to the payment terminal POS machine; and when the RFID induction antenna coil is already in the payment terminal POS machine, the RFID induction antenna coil can be used as an induction coil.
  • Figure 1 is a schematic diagram of electromagnetic induction. We know from physics that when the magnetic flux passing through the metal body changes, an induced electromotive force is generated in the metal, which generates a current in the metal body. This current is closed in a streamline shape, similar to water. The vortex is therefore called eddy current.
  • a high-frequency sinusoidal alternating current signal I1 is passed, and a space around the coil 20 inevitably generates a sinusoidal alternating magnetic field H1.
  • the metal substance 10 in the mobile phone 30 is placed.
  • the metal substance 10 in the mobile phone induces an eddy current I2, which in turn generates a new alternating magnetic field H2. It is obtained by Lenz's law that the action of the alternating magnetic field H2 will cause the anti-antigen magnetic field H1, thereby causing the impedance of the coil 20 to increase.
  • the mobile phone 30 approaches a certain distance range the eddy current is close to the strongest, resulting in the strongest vortex.
  • the change in impedance of the coil 20 also reaches a maximum.
  • Figure 2 is an equivalent circuit schematic of electromagnetic induction.
  • the equivalent circuit of the induction coil 20 can be In Fig. 2, a resistor R1 and an inductor L1 are formed.
  • a high-frequency alternating current I1 is input to both ends of the coil 20.
  • the voltage of the coil 20 is U1, and an alternating magnetic field having a frequency coincident with the current I1 exists around the coil 20.
  • the eddy current I2 is formed. According to the physics principle, the formation of the eddy current can be equivalent to the circuit composed of the inductor L2 and the resistor R2.
  • the eddy current is I2, and the closer the mobile phone is to the coil 20, the larger the eddy current is formed, so that the impedance of the inductance L1 of the coil 20 also increases, so that the alternating current in the coil 20 decreases, and the voltage U1 across the AB decreases.
  • FIG. 3 is a schematic diagram of a voltage detection circuit.
  • the voltage detecting circuit 40 is composed of a diode D1, a capacitor C1 and a resistor R3.
  • the voltage detecting circuit 40 is connected at both ends of the AB.
  • the anode of the detecting diode D1 is connected to the A terminal, the B terminal is grounded, and the negative electrode of the detecting diode D1 is connected to the resistor R3.
  • One end is connected, the other end of the resistor R3 is grounded, and the capacitor C1 is connected to both ends of the resistor R3.
  • a voltage of the DC voltage signal that is, CB
  • the voltage value of the DC signal ie, the voltage across the CB
  • Capacitor C1 acts to filter out AC ripple.
  • the U1 voltage initial value is S0.
  • the U1 voltage is S1.
  • the coil 20 and its surrounding parameters and the input current are usually unchanged, so the voltage S0 can be set to a constant.
  • the voltage S1 is also constantly changing, that is, the voltage S1 is getting smaller.
  • the voltage S1 reaches a minimum value, and the minimum value of S1 is generally close to a constant. Therefore, by detecting the voltage value of the change, the card swipe distance of the mobile phone 30 at the payment terminal POS can be accurately determined.
  • the method for controlling the distance of the mobile phone RF card swipe card comprises two steps of parameter setting and actual control:
  • a voltage detecting circuit 40 is connected to both ends of the induction coil 20 to detect a change in its voltage and obtain a voltage value thereof, which is subjected to analog/digital conversion by an A/D converter and then input to a payment terminal POS machine. Processing by a computer processing system, processed by the computer processing system into data corresponding to a known distance;
  • step d The mobile phone 30 with the radio frequency card is continuously changed to be close to the known distance of the payment terminal POS machine, and step c is repeated to obtain a one-to-one correspondence between the known distances between the mobile phone 30 with the radio frequency card and the payment terminal POS machine.
  • the data corresponding to the different known distances between the obtained mobile phone 30 with the radio frequency card and the payment terminal POS machine is processed with the data as a variable with the radio frequency card
  • the distance between the mobile phone 30 and the payment terminal POS machine is a function expression relationship
  • a same induction coil 20 as that of step a is disposed at a plane position parallel to the surface of the mobile phone RF card, and a high frequency AC excitation signal I1 is applied to the induction coil 20 in the same manner as step a.
  • the induction coil 20 forms a sinusoidal alternating magnetic field H1 at its periphery;
  • the mobile phone 30 with the radio frequency card is placed close to the payment terminal POS machine for card swiping operation;
  • a voltage detecting circuit 40 is connected to both ends of the induction coil 20;
  • the voltage detecting circuit 40 detects the voltage across the induction coil 20 and acquires a detected voltage value, which is subjected to analog/digital conversion by an A/D converter and then sent to a computer processing system of the payment terminal POS machine to process the corresponding Test data;
  • the computer processing system determines whether the detected data is greater than the distance threshold; when the determination is yes, returns to step j; when the determination is no, proceeds to the next step;
  • the computer processing system sends a control instruction to the radio frequency receiving module of the payment terminal POS machine to agree to receive the radio frequency signal for payment by the radio frequency of the mobile phone radio frequency card.
  • the induction coil 20 can be added to the payment terminal POS machine; and when the RFID induction antenna coil is already in the payment terminal POS machine, the RFID induction antenna coil can be used as the induction coil 20 .
  • radio frequency mobile phone card that is, a mobile phone user identification card containing a radio frequency short-range communication function (which can refer to a patent of a mobile phone card and a card reading terminal) can implement mobile phone card swiping.
  • the card reading device that implements the mobile phone swiping is the payment terminal POS machine.
  • the radio frequency mobile phone card and the radio frequency module of the card reading device adopt a whip antenna for short-distance communication.
  • an induction coil is placed on a plane parallel to the card reading direction, and a high frequency AC signal is input to the induction coil.
  • the RFID sensing antenna coil 20 in the contactless card reading system can be directly used as the The induction coil M1 is used (as shown in FIG. 4), and can perform the same function as described above.
  • the mobile phone 30 and the RFID sensing antenna coil 20 can be determined. That is, the distance of the card swiping device (as shown in Figure 5).
  • a device for detecting and controlling the distance of the mobile phone RF card is swiped.
  • the induction coil 20 is placed on a plane parallel to the card reading direction, and the high frequency AC signal is input at both ends of the induction coil 20.
  • a detection circuit 40 is connected to both ends of the coil 20, and the detection circuit 40 is composed of a parallel resistor RL and a capacitor C2.
  • the invention discloses a method and a device for detecting and controlling the distance of a mobile phone radio frequency card, and has the advantages of simple design, reasonable design, simple detection, easy implementation, accurate detection and effective control, and is convenient to implement and can be widely applied.

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Description

一种检测、控制手机射频卡刷卡距离的方法及装置 技术领域
本发明涉及通讯技术领域，特别是涉及一种检测、控制手机射频卡刷卡距离的方法及装置。
背景技术
手机作为移动支付的一种手段开始兴起，从安全考虑，使用手机进行移动支付，就必须适当地控制手机的刷卡距离，这个距离通常要求在5cm 以内，过远的刷卡距离容易被盗刷或误刷。
采用手机射频卡即射频手机用户识别卡是支持手机刷卡比较有效的技术手段，然而，由于射频信号的方向性，功率大小，接受灵敏度，很难精确控制，要准确地检测和控制手机的刷卡距离，一直是一个难题。从而影响了带有手机射频卡的手机进行移动支付的推广应用。
发明内容
本发明的目的在于克服现有技术之不足，提供一种检测、控制手机射频卡刷卡距离的方法及装置，是利用手机自身含有的金属物质在刷卡操作而靠近刷卡机的感应线圈时，对感应线圈的电感量会产生影响，利用这种影响来检测出手机与刷卡机之间的准确距离，并进而实现对手机刷卡距离的控制，具有方法简单、容易实现、检测准确、控制有效的特点。
本发明解决其技术问题所采用的技术方案是：一种检测手机射频卡刷卡距离的方法，包括：
是在支付终端POS机中与手机射频卡刷卡面相平行的平面上设置一个感应线圈；在感应线圈的两端施加一个预置的高频交流激励信号，该高频交流激励信号使所述感应线圈在其周边形成一个正弦交变磁场；将带有手机射频卡的手机靠近所述感应线圈；受所述正弦交变磁场的影响，手机自身的金属物质产生涡流，该涡流又产生新的交变磁场，该新的交变磁场导致所述感应线圈的阻抗发生变化；用一个电压检测电路连接在所述感应线圈的两端以检测其电压的变化并获取其电压值；根据手机越靠近所述感应线圈检测得到的电压值越小的这种对应关系，通过检测该电压值即能获取手机与支付终端POS机之间的距离。
所述感应线圈是在支付终端POS机中新增设的。
所述感应线圈为支付终端POS机中已有的RFID感应天线线圈。
一种控制手机射频卡刷卡距离的方法，包括参数设定和实际控制两个过程：
在参数设定过程中，其包括如下步骤：
a．在支付终端POS机中与手机射频卡刷卡面相平行的平面位置上设置一个感应线圈，并向所述感应线圈施加一个预置的高频交流激励信号，使所述感应线圈在其周边形成一个正弦交变磁场；
b．将带有手机射频卡的手机靠近于支付终端POS机的一个已知距离位置；
c．用一个电压检测电路连接在所述感应线圈的两端以检测其电压的变化并获取其电压值，该电压值经A/D转换器进行模/数转换后输给支付终端POS机的计算机处理系统进行处理，由所述计算机处理系统处理成与已知距离相对应的数据；
d．不断改变所述手机射频卡的手机靠近于支付终端POS机的已知距离，重复步骤c得到若干组手机射频卡的手机与支付终端POS机之间的已知距离所一一对应的数据；
e．由所述计算机处理系统将获得的手机射频卡的手机与支付终端POS机之间的不同已知距离所一一对应的数据处理成以所述数据为变量以所述手机射频卡的手机至支付终端POS机之间的距离为函数的表达关系式；
f．向所述计算机处理系统输入一个手机射频卡的手机至支付终端POS机之间的设定距离值，由计算机处理系统根据所述表达关系式得到一个关于距离的计算数据，该计算数据被认定为手机射频卡的手机至支付终端POS机之间的距离阈值；
在实际控制过程中，其包括如下步骤：
g．在支付终端POS机中与手机射频卡刷卡面相平行的平面位置上设置一个与步骤a相同的感应线圈，并向所述感应线圈施加一个与步骤a相同的高频交流激励信号，使所述感应线圈在其周边形成一个正弦交变磁场；
h．将带有手机射频卡的手机靠近于支付终端POS机进行刷卡操作；
i．在所述感应线圈的两端连接有一个电压检测电路；
j．该电压检测电路检测所述感应线圈两端的电压并获取检测电压值，该检测电压值经A/D转换器进行模/数转换后输给支付终端POS机的计算机处理系统处理成对应的检测数据；
l．所述计算机处理系统对检测数据是否大于所述距离阈值进行判断；当判断为是时，返回步骤j；当判断为否时，继续下一步骤；
m．所述计算机处理系统向支付终端POS机的射频接收模块发送同意接收手机射频卡所射频发送的用于支付的射频信号的控制指令。
所述感应线圈是在支付终端POS机中新增设的。
所述感应线圈为支付终端POS机中已有的RFID感应天线线圈。
本发明的有益效果是，由于采用了在支付终端POS机中与手机射频卡刷卡面相平行的平面上设置一个感应线圈；在感应线圈的两端施加一个预置的高频交流激励信号，该高频交流激励信号使所述感应线圈在其周边形成一个正弦交变磁场；将带有手机射频卡的手机靠近所述感应线圈；受所述正弦交变磁场的影响，手机自身的金属物质产生涡流，该涡流又产生新的交变磁场，该新的交变磁场导致所述感应线圈的阻抗发生变化；用一个电压检测电路连接在所述感应线圈的两端以检测其电压的变化并获取其电压值；根据手机越靠近所述感应线圈检测得到的电压值越小的这种对应关系，通过检测该电压值即能获取手机与支付终端POS机之间的距离；进一步的，利用该检测所获取的准确距离来实现支付终端POS机接收手机射频卡刷卡信号的控制。该方法是基于电磁学的原理，利用手机自身含有的金属物质在刷卡操作而靠近刷卡机的感应线圈时，对感应线圈的电感量会产生影响，利用这种影响来检测出手机与刷卡机之间的准确距离，并进而实现对手机刷卡距离的控制，具有方法简单、容易实现、检测准确、控制有效的特点。
以下结合附图及实施例对本发明作进一步详细说明；但本发明的一种检测、控制手机射频卡刷卡距离的方法不局限于实施例。
附图说明
图1为本发明所利用的电磁感应的原理图；
图2是本发明所利用的电磁感应的等效电路原理图；
图3是本发明的电压检测电路的原理图；
图4是本发明的双频读卡装置的感应线圈的示意图；
图5是本发明的使用方式的示意图。
具体实施方式
参见附图所示，本发明的一种检测手机射频卡刷卡距离的方法，是在支付终端POS机中与手机射频卡刷卡面相平行的平面上设置一个感应线圈；在感应线圈的两端施加一个预置的高频交流激励信号，该高频交流激励信号使所述感应线圈在其周边形成一个正弦交变磁场；将带有手机射频卡的手机靠近所述感应线圈；受所述正弦交变磁场的影响，手机自身的金属物质产生涡流，该涡流又产生新的交变磁场，该新的交变磁场导致所述感应线圈的阻抗发生变化；用一个电压检测电路连接在所述感应线圈的两端以检测其电压的变化并获取其电压值；根据手机越靠近所述感应线圈检测得到的电压值越小的这种对应关系，通过检测该电压值即能获取手机与支付终端POS机之间的距离。
其中：
对于支付终端POS机中没有线圈的情况，可以在支付终端POS机中增设感应线圈；而对于支付终端POS机中已有RFID感应天线线圈时，可以将RFID感应天线线圈作为感应线圈来使用。
图1为电磁感应的原理图。我们由物理学可以知到，当通过金属体的磁通量发生变化时，就会在金属里产生感应电动势，该电势会在金属体中产生电流，这种电流以流线形状成闭合回路，类似水中漩涡因此称为涡流。
在线圈20中，通以高频正弦交流信号I1，线圈20周围空间必然产生正弦交变磁场H1，当手机30靠近线圈M1，即进入磁场H1时，手机30中的金属物质10，就置于线圈20的交变磁场H1中，手机中的金属物质10就会感应出涡流电流I2，从而又产生新的交变磁场H2。由楞次定律可得：交变磁场H2的作用将反抗原磁场H1，从而，导致线圈20的阻抗增大。由于越靠近线圈20，交变磁场H2也越强，所以手机越接近在线圈20，其产生的涡流也越强，当手机30接近到某一距离范围时，其产生的涡流接近最强，导致线圈20的阻抗的变化也达到最大值。
图2为电磁感应的等效电路原理图。感应线圈20等效电路可以由 图2中电阻R1、电感L1组成，在线圈20的两端输入一高频交流电流I1，线圈20的电压为U1，线圈20周围存在在一个和电流I1频率一致的交变磁场。当手机30靠近感应线圈20，正如前面所述的，在手机30的金属物质10中，就形成涡流I2，根据物理学原理，可以把这个涡流的形成等效为电感L2、电阻R2组成的回路，涡流电流为I2，手机越靠近线圈20，形成的涡流越大，导致线圈20的电感L1的阻抗也增大，从而线圈20中交流电流减小，并导致AB两端的电压U1减小。
图3为电压检测电路的原理图。该电压检测电路40由二极管D1、电容C1和电阻R3构成，电压检测电路40连接在AB两端，其中检波二极管D1的正极连接在A端，B端接地，检波二极管D1的负极与电阻R3的一端相连接，电阻R3的另一端接地，电容C1连接在电阻R3的两端。 这样，在电阻R3上就可以获得一个直流电压信号即CB两端的电压，这个直流信号的电压值（即CB两端的电压）和AB两端的电压（即电压U1）成正比。电容C1起滤除交流纹波的作用。
设定U1电压初值为S0，手机30靠近感应线圈时，U1电压为S1，在实际应用中，线圈20及其周边参数和输入的电流通常不变，所以电压S0可以设定为一个常数，随着手机不断靠近线圈20，即手机30与支付终端POS机之间的距离不断缩小， 电压S1也在不断变化，即电压S1在不断变小，当手机30接近线圈20时，电压S1达到最小值，S1的最小值一般也接近一个常数。所以通过检测这个变化的电压值，就可以准确的判断手机30在支付终端POS机的刷卡距离。
本发明的一种控制手机射频卡刷卡距离的方法，包括参数设定和实际控制两个过程：
在参数设定过程中，其包括如下步骤：
a．在支付终端POS机中与手机射频卡刷卡面相平行的平面位置上设置一个感应线圈20，并向所述感应线圈20施加一个预置的高频交流激励信号I1，使所述感应线圈20在其周边形成一个正弦交变磁场H1；
b．将带有射频卡的手机30靠近于支付终端POS机的一个已知距离位置；
c．用一个电压检测电路40连接在所述感应线圈20的两端以检测其电压的变化并获取其电压值，该电压值经A/D转换器进行模/数转换后输给支付终端POS机的计算机处理系统进行处理，由所述计算机处理系统处理成与已知距离相对应的数据；
d．不断改变所述带有射频卡的手机30靠近于支付终端POS机的已知距离，重复步骤c得到若干组带有射频卡的手机30与支付终端POS机之间的已知距离所一一对应的数据；
e．由所述计算机处理系统将获得的带有射频卡的手机30与支付终端POS机之间的不同已知距离所一一对应的数据处理成以所述数据为变量以所述带有射频卡的手机30至支付终端POS机之间的距离为函数的表达关系式；
f．向所述计算机处理系统输入一个带有射频卡的手机30至支付终端POS机之间的设定距离值，由计算机处理系统根据所述表达关系式得到一个关于距离的计算数据，该计算数据被认定为带有射频卡的手机30至支付终端POS机之间的距离阈值；
在实际控制过程中，其包括如下步骤：
g．在支付终端POS机中与手机射频卡刷卡面相平行的平面位置上设置一个与步骤a相同的感应线圈20，并向所述感应线圈20施加一个与步骤a相同的高频交流激励信号I1，使所述感应线圈20在其周边形成一个正弦交变磁场H1；
h．将带有射频卡的手机30靠近于支付终端POS机进行刷卡操作；
i．在所述感应线圈20的两端连接有一个电压检测电路40；
j．该电压检测电路40检测所述感应线圈20两端的电压并获取检测电压值，该检测电压值经A/D转换器进行模/数转换后输给支付终端POS机的计算机处理系统处理成对应的检测数据；
l．所述计算机处理系统对检测数据是否大于所述距离阈值进行判断；当判断为是时，返回步骤j；当判断为否时，继续下一步骤；
m．所述计算机处理系统向支付终端POS机的射频接收模块发送同意接收手机射频卡所射频发送的用于支付的射频信号的控制指令。
其中：
对于支付终端POS机中没有线圈的情况，可以在支付终端POS机中增设感应线圈20；而对于支付终端POS机中已有RFID感应天线线圈时，可以将RFID感应天线线圈作为感应线圈20来使用。
采用射频手机卡即含有射频近距离通信功能的手机用户识别卡（可以引用手机卡与读卡终端的专利）可以实现手机刷卡。
实施手机刷卡的读卡装置即支付终端POS机，在读卡天线的装置中，射频手机卡与读卡装置的射频模块采用鞭状天线，进行短距离通信。在读卡装置中，与读卡方向平行的平面上，放置感应线圈，感应线圈中输入高频交流信号。
对于既可以读普通RFID非接触式卡（如：ISO14443标准的卡），也可以射频手机卡的双频读卡装置，可以直接使用非接触式卡读卡系统中的RFID感应天线线圈20来作为感应线圈M1使用（如图4所示），可以起到和前面所述的同样的作用，通过检测线圈端的电压（检波后的直流电压）的变化，就可以确定手机30与RFID感应天线线圈20即刷卡装置的距离（如图5所示）。
如图5所示，一种检测、控制手机射频卡刷卡距离的装置，在读卡装置中，与读卡方向平行的平面上放置感应线圈20，感应线圈20两端输入高频交流信号，在感应线圈20的两端连接有检测电路40，检测电路40是由并联的电阻RL和电容C2组成。
上述实施例仅用来进一步说明本发明的一种检测、控制手机射频卡刷卡距离的方法，但本发明并不局限于实施例，凡是依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均落入本发明技术方案的保护范围。
工业实用性
本发明一种检测、控制手机射频卡刷卡距离的方法及装置，构思巧妙、设计合理，具有检测方法简单、容易实现、检测准确、控制有效的特点，便于实施，可广泛应用。

Claims (9)

  1. 一种检测手机射频卡刷卡距离的方法，其特征在于：包括：
    是在支付终端POS机中与手机射频卡刷卡面相平行的平面上设置一个感应线圈（20）；在感应线圈（20）的两端施加一个预置的高频交流激励信号（I1），该高频交流激励信号（I1）使所述感应线圈（20）在其周边形成一个正弦交变磁场（H1）；将带有手机射频卡的手机（30）靠近所述感应线圈（20）；受所述正弦交变磁场（H1）的影响，手机（30）自身的金属物质（10）产生涡流，该涡流（I1）又产生新的交变磁场（H2），该新的交变磁场（H2）导致所述感应线圈（20）的阻抗发生变化；用一个电压检测电路（40）连接在所述感应线圈（20）的两端以检测其电压的变化并获取其电压值；根据手机（30）越靠近所述感应线圈（M1）检测得到的电压值越小的这种对应关系，通过检测该电压值即能获取手机（30）与支付终端POS机之间的距离。
  2. 根据权利要求1所述的检测手机射频卡刷卡距离的方法，其特征在于：所述感应线圈（20）是在支付终端POS机中新增设的。
  3. 根据权利要求1所述的检测手机射频卡刷卡距离的方法，其特征在于：所述感应线圈（20）为支付终端POS机中已有的RFID感应天线线圈。
  4. 一种控制手机射频卡刷卡距离的方法，其特征在于：包括参数设定和实际控制两个过程：
    在参数设定过程中，其包括如下步骤：
    a．在支付终端POS机中与手机射频卡刷卡面相平行的平面位置上设置一个感应线圈（20），并向所述感应线圈（20）施加一个预置的高频交流激励信号（I1），使所述感应线圈（20）在其周边形成一个正弦交变磁场（H1）；
    b．将带有手机射频卡的手机（30）靠近于支付终端POS机的一个已知距离位置；
    c．用一个电压检测电路（40）连接在所述感应线圈（20）的两端以检测其电压的变化并获取其电压值，该电压值经A/D转换器进行模/数转换后输给支付终端POS机的计算机处理系统进行处理，由所述计算机处理系统处理成与已知距离相对应的数据；
    d．不断改变所述带有射频卡的手机（30）靠近于支付终端POS机的已知距离，重复步骤c得到若干组带有射频卡的手机（30）与支付终端POS机之间的已知距离所一一对应的数据；
    e．由所述计算机处理系统将获得的带有射频卡的手机（30）与支付终端POS机之间的不同已知距离所一一对应的数据处理成以所述数据为变量以所述带有射频卡的手机（30）至支付终端POS机之间的距离为函数的表达关系式；
    f．向所述计算机处理系统输入一个带有射频卡的手机（30）至支付终端POS机之间的设定距离值，由计算机处理系统根据所述表达关系式得到一个关于距离的计算数据，该计算数据被认定为带有射频卡的手机（30）至支付终端POS机之间的距离阈值；
    在实际控制过程中，其包括如下步骤：
    g．在支付终端POS机中与手机射频卡刷卡面相平行的平面位置上设置一个与步骤a相同的感应线圈（20），并向所述感应线圈（20）施加一个与步骤a相同的高频交流激励信号（I1），使所述感应线圈（20）在其周边形成一个正弦交变磁场（H1）；
    h．将带有射频卡的手机（30）靠近于支付终端POS机进行刷卡操作；
    i．在所述感应线圈（20）的两端连接有一个电压检测电路（40）；
    j．该电压检测电路检（40）测所述感应线圈（20）两端的电压并获取检测电压值，该检测电压值经A/D转换器进行模/数转换后输给支付终端POS机的计算机处理系统处理成对应的检测数据；
    l．所述计算机处理系统对检测数据是否大于所述距离阈值进行判断；当判断为是时，返回步骤j；当判断为否时，继续下一步骤；
    m．所述计算机处理系统向支付终端POS机的射频接收模块发送同意接收手机射频卡所射频发送的用于支付的射频信号的控制指令。
  5. 根据权利要求4所述的检测手机射频卡刷卡距离的方法，其特征在于：所述感应线圈（20）是在支付终端POS机中新增设的。
  6. 根据权利要求4所述的检测手机射频卡刷卡距离的方法，其特征在于：所述感应线圈（20）为支付终端POS机中已有的RFID感应天线线圈。
  7. 一种检测手机射频卡刷卡距离的装置，其特征在于：包括：
    在支付终端POS机中与手机射频卡刷卡面相平行的平面上设置一个感应线圈（20）；在感应线圈（20）的两端施加一个预置的高频交流激励信号（I1），进一步感应线圈（20）的两端还连接有一个电压检测电路（40）。
  8. 根据权利要求7所述的检测手机射频卡刷卡距离的装置，其特征在于：所述感应线圈（20）是在支付终端POS机中新增设的。
  9. 根据权利要求7所述的检测手机射频卡刷卡距离的装置，其特征在于：所述感应线圈（20）为支付终端POS机中已有的RFID感应天线线圈。
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