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A contactless card reader

A non-contact, card reader technology, used in instruments, inductive record carriers, computer parts, etc., can solve the problem of reducing the sensitivity of the card reader's receiving antenna, and achieve the effect of improving the receiving sensitivity and the signal strength ratio.

Active Publication Date: 2017-12-08
FUJIAN LANDI COMML EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when receiving wireless electromagnetic waves, the carrier signal amplification will suppress the received card signal, thereby greatly reducing the sensitivity of the card reader receiving antenna

Method used

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  • A contactless card reader
  • A contactless card reader

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] How a traditional contactless card reader works:

[0035] A traditional contactless card reader includes a contactless card reader chip, an EMC filter, an impedance matching circuit, an antenna coil, and a receiving circuit. The contactless card reader chip is used to transmit and receive signals, and complete signal modulation and demodulation.

[0036] When the contactless card reader transmits a signal, the RF drive pins TX1 and TX2 of the contactless card reader chip output a 13.56MHz differential square wave signal, which is filtered by an EMC filter and then passes through the impedance The matching circuit transmits to the antenna coil and radiates out.

[0037] When the non-contact card reader receives the signal, the receiving circuit divides the voltage from the antenna coil to obtain the carrier signal and the card signal, and the receiving circuit outputs to the non-contact card reader chip through the RX pin for internal processing and demodulation to obta...

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PUM

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Abstract

The invention relates to a non-contact card reader. A series LC parallel resonant circuit is added between the receiving circuit and the antenna coil of the traditional non-contact card reader, and the preset threshold is set as small as possible, indicating that the resonant frequency of the LC parallel resonant circuit is as close as possible to the contactless reader. The carrier frequency of the card chip, when the resonant frequency of the LC parallel resonant circuit is closer to the carrier frequency of the contactless card reader chip, the carrier signal will be suppressed more, thereby improving the card signal and carrier signal. The signal strength ratio is equivalent to amplifying the card signal when the carrier signal remains unchanged, and improving the non-contact reading without changing the Q value of the antenna coil and the internal receiving gain of the non-contact card reader chip. Card antenna receiving sensitivity.

Description

technical field [0001] The invention relates to a non-contact card reader. Background technique [0002] At present, the contactless card reader adopts the 13.56MHz frequency standard and is used in the technical field of near field communication. It is designed in accordance with the ISO14443 international standard and the EMV Contactless Specifications for paymentsystems payment standard formulated by EMVco. At present, the contactless card mainly returns data to the card reader through load modulation technology, and the signal amplitude of the card data is very small. Therefore, the antenna of the contactless card reader needs sufficient receiving sensitivity to achieve the best receiving effect. [0003] At present, the receiving sensitivity of the contactless card reader antenna is mainly improved by increasing the Q value of the receiving antenna or increasing the internal receiving gain of the chip of the contactless card reader. However, improving the Q value of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 童佳育蒋锦扬叶芳耀
Owner FUJIAN LANDI COMML EQUIP CO LTD