CN203149603U - Identification reader-writer for T5557 radio frequency cards - Google Patents

Abstract

The utility model provides an identification reader-writer for T5557 radio frequency cards. The identification reader-writer comprises a control device (1), a matching network module (5) and an antenna module (6), wherein the control device (1) consists of a signal transmitting unit and a signal receiving unit, the signal transmitting unit and the signal receiving unit are connected with the antenna module (6) through the matching network module (5), and the signal transmitting unit includes a signal generator generating square waves of which the frequency is 125KHz. The identification reader-writer for T5557 radio frequency cards, provided by the utility model, adopts technologies such as the inductive coupling technology, an LC series-parallel resonant circuit, a multilevel power amplification circuit and a filter circuit, long-distance card reading for T5557 radio frequency cards is realized, and the card reading distance can be larger than 50cm.

Description

Identification reader for T5557 radio frequency card

technical field

The utility model relates to the technical field of wireless communication, in particular to a T5557 type radio frequency card identification reader for 125KHz frequency band in a radio frequency identification (RFID) system.

Background technique

Radio frequency identification technology is a non-contact automatic identification technology realized by radio frequency communication, also known as electronic tag technology, which is an innovative automatic identification technology. It takes wireless communication technology and large-scale integrated circuit technology as the core, uses radio frequency signals and their spatial coupling and transmission characteristics to realize automatic identification of stationary or moving targets, and efficiently obtains target information data. Through the combination with Internet and other technologies, it can Realize the tracking of targets and the sharing of information on a global scale.

A typical RFID system includes radio frequency tags, readers, and computer equipment. The transmitter in the reader/writer outputs a radio frequency signal through the antenna to form an electromagnetic field to activate the radio frequency tag, and the electromagnetic field makes the radio frequency tag return a radio frequency signal carrying information. The receiver in the reader achieves data extraction by demodulating the radio frequency signal carrying the information.

In the RFID system, the T5557 radio frequency card belongs to the 125KHz low frequency band, and the inductive coupling mode works between the radio frequency card and the reader. At present, the readers for this RF card on the market are all low-power readers, and the card reading distance is less than 10cm. It is impossible to directly apply the existing readers to the applications that require long-distance card reading, so this is limited. The scope of application of the class reader.

Utility model content

Aiming at the deficiencies in the prior art, the utility model provides an identification reader-writer specially used for T5557 type radio frequency card, which solves the application problem of T5557 type radio frequency card long-distance card reading.

In order to achieve the above-mentioned purpose, the technology adopted in the utility model is a kind of identification reader-writer for T5557 radio frequency card, including control device (1), matching network module (5) and antenna module (6), the control device (1) It includes a signal transmitting unit and a signal receiving unit, the signal transmitting unit is connected to the antenna module (6) through the matching network module (5), and the signal receiving unit is connected to the antenna module (6) through the matching network module (5) connection; the signal transmitting unit includes a signal generator that generates a square wave with a frequency of 125KHz.

In a preferred embodiment provided by the utility model, the identification reader also includes a booster module (3) and a power amplifier module (4), and the booster module (3) connects the signal transmitting unit The generated signal is amplified, and the booster module (3) sends the amplified signal to the power amplifier module (4) for power amplification, and the power amplifier module (4) outputs the amplified power signal to the matching network in module (5).

In a preferred embodiment provided by the utility model, the identification reader further includes a detection circuit module (7), and the detection circuit module (7) detects signals entering the matching network module (5), The detected signal is sent from the detection circuit module (7) to the signal receiving unit.

In a preferred embodiment provided by the utility model, the identification card reader further includes an amplifying circuit module (8), and the amplifying circuit module (8) amplifies the output signal of the detection circuit module (7). The amplified signal is fed to the signal receiving unit.

In a preferred embodiment provided by the utility model, the identification reader-writer further includes a filter circuit module (9), and the filter circuit module (9) filters the output signal of the amplifying circuit module (8), and after filtering The signal is delivered to the signal receiving unit.

In a preferred embodiment provided by the present utility model, wherein the control device is mainly formed by a single-chip microcomputer.

In a preferred embodiment provided by the present utility model, wherein the signal receiving unit is mainly formed by an A/D sampling module.

Compared with the prior art, the identification reader for the T5557 type radio frequency card provided by the utility model adopts technologies such as inductive coupling technology, LC series-parallel resonant circuit, multi-stage power amplifier circuit, filter circuit, etc. The long-distance card reading of the radio frequency card, the card reading distance can reach more than 50cm.

Description of drawings

Fig. 1 is a connection frame diagram of the identification reader-writer provided by the utility model.

Detailed ways

The utility model provides an identification reader-writer with a long reading distance, which adopts inductive coupling technology, LC series-parallel resonant circuit, multi-stage power amplifier circuit, filter circuit and other technologies to solve the problem of T5557 type radio frequency card long-distance card reading. application problems.

The identification card reader provided by the utility model will be further described in detail through the examples below, so as to better understand the content of the invention, but the content of the examples does not limit the scope of protection of the invention.

As shown in Fig. 1, the identification card reader provided by the utility model is divided into two parts: a transmitting signal channel and a receiving signal channel.

In the transmission channel, the signal transmission unit on the microcontroller module/MCU (1) outputs a square wave signal fc (2) with a frequency of 125KHz, and the square wave signal is output to the booster module (3) for pre-amplification. The signal is output to the power amplifier module (4) for power amplification. The signal is then output to the matching network module (5) for impedance matching, and finally the signal is loaded onto the antenna module (6) to output a radio frequency signal. The output radio frequency signal forms an electromagnetic field to activate the radio frequency tag.

In the receiving channel, the radio frequency signal carrying information enters the detection circuit module (7) through the antenna module (6) and the matching network module (5) for detection. Since the radio frequency card adopts load modulation, the amplitude of the useful signal will be very small and will be covered by the antenna voltage as high as hundreds of volts. Therefore, after detection, it is necessary to use a high-gain amplifier circuit module (8) to amplify the tiny useful signal . The amplified signal is then sent to the filter circuit module (9) for filtering, and finally sent to the signal receiving unit on the single-chip microcomputer module (1) for A/D acquisition to realize information decoding.

The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the utility are also within the scope of the utility model. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention shall fall within the scope of the present invention.

Claims (7)

1. an identification read write line that is used for T5557 type radio-frequency card is characterized in that comprise control device (1), matching network module (5) and Anneta module (6), described control device (1) comprises signal transmitter unit and signal receiving unit,

Described signal transmitter unit is connected with Anneta module (6) by matching network module (5), and described signal receiving unit is connected with Anneta module (6) by matching network module (5);

Described signal transmitter unit comprises that producing frequency is the signal generator of 125KHz square wave.

2. according to the identification read write line shown in the claim 1, it is characterized in that, also comprise in the described identification read write line and promote level module (3) and power amplifier level module (4), the described level module (3) that promotes is amplified the signal that described signal transmitter unit produces, promotion level module (3) is transported to the described signal through amplifying in the power amplifier level module (4) carries out power amplification, and power amplifier level module (4) will export in the matching network module (5) through the described signal of amplifying power.

3. according to the identification read write line shown in the claim 1, it is characterized in that, also comprise detecting circuit module (7) in the described identification read write line, described detecting circuit module (7) will enter that signal carries out detection in the matching network module (5), be transported to the described signal receiving unit from detecting circuit module (7) through the described signal of detection.

4. according to the identification read write line shown in the claim 3, it is characterized in that, also comprise amplifying circuit module (8) in the described identification card reader, described amplifying circuit module (8) is amplified detecting circuit module (7) output signal, and the described signal through amplifying is transported in the described signal receiving unit.

5. according to the identification read write line shown in the claim 4, it is characterized in that, described identification read write line also comprises filtering circuit module (9), described filtering circuit module (9) is carried out filtering with amplifying circuit module (8) output signal, is transported in the described signal receiving unit through the described signal of filtering.

6. according to the identification read write line shown in the claim 1, it is characterized in that described control device is mainly formed by single-chip microcomputer.

7. according to the identification read write line shown in the claim 1, it is characterized in that described signal receiving unit is mainly formed by the A/D sampling module.

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