Device, method, and card reader for low-frequency magnetic field signal detection

Abstract

The invention discloses a detection device and a method thereof of low-frequency magnetic field signals and a card reader, wherein the detection device comprises a low-frequency magnetic field receiving module used for receiving low-frequency magnetic field signals emitted from a low-frequency magnetic field emission source, and a microcontroller used for determining whether the low-frequency magnetic field emission source fault occurs according to the receiving result of the low-frequency magnetic field signals by the low-frequency magnetic field receiving module. The detection device can be used for determining whether the work of the current low-frequency magnetic field emission source is normal or not, and informing the low-frequency magnetic field emission source of adjusting corresponding low-frequency emission parameters when detecting that the work of the emission source is abnormal, so that the normal work of the low-frequency magnetic field emission source is ensured.

Description

technical field [0001] The present invention relates to the field of short-distance communication, in particular to a low-frequency magnetic field signal detection device, method and card reader. Background technique [0002] With the continuous development of mobile communication technology, the RFID-SIM solution based on the low-frequency magnetic field to control the transaction distance has attracted widespread attention due to its advantages such as small difference in the transaction distance of terminal equipment, easy control of the distance, and less susceptible to interference. "A Radio Frequency Device, Radio Frequency Card Reader, and Related Communication System" (application number: 200920179981.5) discloses a technical solution for controlling the transaction distance between the card reader and the mobile terminal by judging the intensity of the low-frequency field. The card reader transmits a low-frequency magnetic field signal of a certain strength to the d...

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Problems solved by technology

[0004] (1) The card reader will weaken the emitted low-frequency field strength due to the discreteness of its own electronic components, which will reduce the maximum physical communication distance that can be traded, resulting in the inability of the mobile terminal to trade;

[0005] (2) The low-frequency field strength emitted by the card reader is maliciously attacked or due to the increased discreteness of the card reader's own electronic components, the actual maximum physical communication distance that can be traded increases, so that the mobile terminal is not within the set maximum physical communication distance for transactions. The transaction can be completed within the distance, so that the user may complete the transaction without realizing it;

[0006] (3) The low-frequency magnetic field signal cannot be transmitted due to the broken coil of the card reader, etc., but it cannot quickly detect the problem of the low-frequency transmitting circuit of the card reader through effective methods;

[0007] (4) The card reader needs to work under the set low-frequency field strength signal cycle and change sequence characteristics in order to enable the mobile terminal to obtain accurate low-frequency data. Therefore, if the low-frequency field strength cycle and change sequence characteristics of the card reader are changed , will cause the mobile terminal to be unable to obtain accurate low-frequency data, and may even cause the mobile terminal to fail to achieve transactions

[0008] Therefore, in the existing RFID-SIM solution, if the low-frequency transmission parameters on the low-frequency transmission circuit of the card reader change, the low-frequency field strength, frequency, cycle, and signal change sequence characteristics will change, making the card reader not working properly

However, in the prior art, even if the low-frequency transmission parameters on the low-frequency transmission circuit of the card reader change, there is no effective solution to detect the problem on the low-frequency transmission circuit, so that the communication between the card reader and the mobile terminal cannot be guaranteed. normal transaction

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