CN204229433U - A kind of hyperchannel rfid interrogator and RFID recognition system - Google Patents

Abstract

The utility model discloses a kind of hyperchannel rfid interrogator and RFID recognition system, hyperchannel rfid interrogator comprises single-chip microcomputer; RFID radio-frequency module, RFID radio-frequency module is connected with single-chip microcomputer; First multiple signals switch chip, and the first multiple signals switch the radiofrequency signal end of chip and are connected with the radiofrequency signal end of RFID radio-frequency module, and the first multiple signals switch the first control input end of chip and are connected with the first control output end of RFID radio-frequency module; Second multiple signals switch chip, the radiofrequency signal end that second multiple signals switch chip is connected with the radiofrequency signal branch end that the first multiple signals switch chip, and the second multiple signals switch the second control input end of chip and are connected with the second control output end of single-chip microcomputer; Antenna, the radiofrequency signal branch end that antenna and the second multiple signals switch chip is connected.By the way, the utility model can achieve a hyperchannel rfid interrogator and controls multiple antenna.

Description

A kind of multi-channel RFID reader-writer and RFID identification system

technical field

The utility model relates to the technical field of radio frequency processing, in particular to a multi-channel RFID reader-writer and an RFID identification system.

Background technique

Radio Frequency Identification (RFID) is a wireless communication technology that identifies specific targets through radio signals and reads and writes relevant data without establishing mechanical or optical contact between the identification system and specific targets. The basic principle is to use the transmission characteristics of radio frequency signal and space coupling (inductive or electromagnetic coupling) or radar reflection to realize the automatic identification of the identified object.

RFID identification systems usually include RFID readers and electronic tags integrated with antennas. The RFID reader communicates wirelessly with the RFID electronic tag through the antenna, and can read or write the tag identification code and memory data. The RFID reader includes an RFID radio frequency module (transmitter and receiver), a control unit and an antenna. The spatial (contactless) coupling of radio frequency signals is realized between the electronic tag and the RFID reader through the coupling element, and in the coupling channel, according to the timing relationship, the transmission and data exchange are realized.

RFID technology has been widely used in different industries, for example: attaching an electronic tag to a car in production, the factory can easily track the progress of the car on the production line; electronic tags can also be attached to livestock and pets, Facilitate the identification of livestock and pets.

The inventor of this utility model has found in long-term research that: in the existing technology, a reader device can only be connected to one antenna, even if it is a split RFID reader, it can only be connected to a maximum of 4 external antennas. Therefore, when more antennas are needed to read electronic tags, several more RFID readers must be added, which increases the development cost of the user and increases the difficulty of development.

Utility model content

The technical problem mainly solved by the utility model is to provide a multi-channel RFID reader-writer and RFID identification system, which realizes the control of multiple antennas by one multi-channel RFID reader-writer, reduces the cost of project application, and reduces the The difficulty of system development.

In order to solve the above-mentioned technical problems, a technical scheme adopted by the utility model is: provide a kind of multi-channel RFID reader-writer, comprise single-chip microcomputer, described single-chip microcomputer comprises control output end; RFID radio frequency module, described RFID radio frequency module and described single-chip microcomputer Connection; the first multi-channel signal switching chip, the radio frequency signal end of the first multi-channel signal switching chip is connected to the radio frequency signal end of the RFID radio frequency module, the control input end of the first multi-channel signal switching chip is connected to the The control output terminal of the RFID radio frequency module is connected; the second multi-channel signal switching chip, the radio frequency signal end of the second multi-channel signal switching chip is connected with the radio frequency signal branch end of the first multi-channel signal switching chip, and the The control input end of the second multi-channel signal switching chip is connected to the control output end of the single-chip microcomputer; the antenna is connected to the radio frequency signal branch end of the second multi-channel signal switching chip.

Wherein, the first multi-channel signal switching chip is a four-channel signal switching chip, and the control output terminal of the RFID radio frequency module and the control input terminal of the first multi-channel signal switching chip are two I/O terminals; The second multi-channel signal switching chip is an eight-channel signal switching chip, and the control output terminals of the single-chip microcomputer and the control input terminals of the second multi-channel signal switching chip are three I/O terminals.

Wherein, the number of the eight-way signal switching chip is four, and a radio frequency signal branch end of the four-way signal switching chip is connected to a radio frequency signal end of an eight-way signal switching chip; the number of the antennas is thirty-two, so One radio frequency signal branch end of the eight-way signal switching chip is connected to an antenna.

Wherein, the multi-channel RFID reader/writer also includes a serial port; the serial port is respectively connected to the serial port of the RFID radio frequency module and the serial port of the single-chip microcomputer.

In order to solve the above-mentioned technical problems, another technical solution adopted by the utility model is to provide an RFID identification system, including a processor, a multi-channel RFID reader-writer and an electronic tag; the multi-channel RFID reader-writer includes: the Single-chip microcomputer comprises control output end; RFID radio frequency module, described RFID radio frequency module is connected with described single-chip microcomputer; First multi-channel signal switching chip, the radio frequency signal end of described first multi-channel signal switching chip and the radio frequency of described RFID radio frequency module The signal end is connected, the control input end of the first multi-channel signal switching chip is connected with the control output end of the RFID radio frequency module; the second multi-channel signal switching chip, the radio frequency signal end of the second multi-channel signal switching chip It is connected with the radio frequency signal branch end of the first multi-channel signal switching chip, the control input terminal of the second multi-channel signal switching chip is connected with the control output terminal of the single-chip microcomputer; the antenna, the antenna is connected with the second The radio frequency signal branch end of the multi-channel signal switching chip is connected; the processor is connected with the single-chip microcomputer, and the electronic label is set on the object to be detected.

Wherein, the first multi-channel signal switching chip is a four-channel signal switching chip, and the control output terminal of the RFID radio frequency module and the control input terminal of the first multi-channel signal switching chip are two I/O terminals; The second multi-channel signal switching chip is an eight-channel signal switching chip, and the control output terminals of the single-chip microcomputer and the control input terminals of the second multi-channel signal switching chip are three I/O terminals.

Wherein, the number of the eight-way signal switching chip is four, and a radio frequency signal branch end of the four-way signal switching chip is connected to a radio frequency signal end of an eight-way signal switching chip; the number of the antennas is thirty-two, so One radio frequency signal branch end of the eight-way signal switching chip is connected to an antenna.

Wherein, the multi-channel RFID reader/writer also includes a serial port; the serial port is respectively connected to the serial port of the RFID radio frequency module and the serial port of the single-chip microcomputer.

Wherein, the RFID identification system includes a display; the display is connected to the processor.

Wherein, the serial port of the single-chip microcomputer is connected with the serial port of the processor.

The beneficial effects of the utility model are: different from the situation of the prior art, the utility model connects the first multi-channel signal switching chip in series on the RFID radio frequency module, and connects the second multi-channel signal switching chip in series on the first multi-channel signal switching chip Switching the chip greatly expands the RF signal interface, so that the RFID RF module can mount more antennas, expand the number of antennas in the multi-channel RFID reader, and realize the control of multiple antennas by a multi-channel RFID reader. There is no need to configure multiple RFID readers to control multiple antennas, which reduces the cost of project applications and reduces the difficulty of system development.

Description of drawings

Fig. 1 is the schematic diagram of the embodiment of multi-channel RFID reader-writer of the present invention;

2 is a schematic diagram of the separation of the first multi-channel signal switching chip and the RFID radio frequency module in the implementation mode of the multi-channel RFID reader of the present invention;

Fig. 3 is the schematic diagram of combining the first multi-channel signal switching chip and the RFID radio frequency module in the embodiment of the multi-channel RFID reader of the present invention;

Fig. 4 is a schematic structural diagram of the RFID identification system of the present invention.

Detailed ways

In order to facilitate the understanding of the utility model, the utility model will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is said to be "fixed" to another element, it may be directly on the other element, or there may be one or more intervening elements therebetween. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions are used in this specification for the purpose of description only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the utility model in this description are only for describing the purpose of specific implementation, and are not used to limit the utility model. The term "and/or" used in this specification includes any and all combinations of one or more of the associated listed items.

The utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.

Please refer to FIG. 1 and FIG. 2 , the multi-channel RFID reader-writer 20 includes a single-chip microcomputer 21 , an RFID radio frequency module 22 , a first multi-channel signal switching chip 23 , a second multi-channel signal switching chip 24 and an antenna 25 . The RFID radio frequency module 22 is used to transmit and receive radio frequency signals. The multi-channel signal switching chip is a chip with multiple channels, and any one of them can be selected for communication. In short, the multi-channel signal switching chip is quite a single-pole multi-channel Throw the switch.

The microcontroller 21 includes a control output terminal 211 . The single-chip microcomputer 21 is connected with the RFID radio frequency module 22, and the single-chip microcomputer 21 is used for controlling the RFID radio frequency module 22. The radio frequency signal end of the first multi-channel signal switching chip 23 is connected with the radio frequency signal end of the RFID radio frequency module 22, the control input end 221 of the first multi-channel signal switching chip 22 is connected with the control output end 231 of the RFID radio frequency module 23, the first The control input terminal 221 of the multi-channel signal switching chip 22 outputs a control signal to the control output terminal 231 of the RFID radio frequency module 23, so that the first multiple signal switching chip 22 switches to the corresponding channel. The radio frequency signal end of the second multi-channel signal switching chip 24 is connected to the radio frequency signal branch end of the first multi-channel signal switching chip 23 . The control input end 241 of the second multi-channel signal switching chip 24 is connected with the control output end 211 of the single-chip microcomputer, and the control output end 211 of the single-chip microcomputer outputs the control signal to the control input end 241 of the second multi-channel signal switching chip 24, so that the second The multi-channel signal switching chip 24 is switched to the corresponding channel. The antenna 25 is connected to the branch end of the radio frequency signal of the second multi-channel signal switching chip 24 . The multi-channel RFID reader/writer connects the first multi-channel signal switching chip 23 to the RFID radio frequency module 22, and connects the second multi-channel signal switching chip 24 to the first multi-channel signal switching chip 23 to greatly expand the radio frequency signal of the antenna 25. Interface, and then mount more antennas 25.

The first multi-channel signal switching chip 22 is a four-way signal switching chip, and the four-way signal switching chip has a radio frequency signal end and four radio frequency signal branch ends, wherein, a radio frequency signal end can be connected with any one of the four radio frequency signal branch ends connected to form a channel. The second multi-channel signal switching chip 25 is an eight-way signal switching chip, and the eight-way signal switching chip has a radio frequency signal terminal and eight radio frequency signal branch terminals, wherein one radio frequency signal terminal can communicate with any one of the eight radio frequency signal branch terminals, Form a channel. It is worth noting that the multi-channel signal switching core can only use one channel at the same time, which avoids signal interference caused by multiple antennas sending signals at the same time, and the use of channels can be controlled by polling. In the embodiment of the present utility model, the number of eight-way signal switching chips is four, a radio frequency signal branch end of the first multi-way signal switching chip 23 is connected to a radio frequency signal end of an eight-way signal switching chip, and the number of antennas 25 is thirty Two, one radio frequency signal branch end of the second multi-channel signal switching chip 25 is connected to one antenna 25, and different antennas 25 are applied to different projects, which expands the applicability of more different projects to different numbers of antennas.

The control input end of the first multi-channel signal switching chip is two I/O ends, and the control output end of the RFID radio frequency module is two I/O ends, and the two I/O ends of the RFID radio frequency module are connected with the first multi-channel signal The two I/O terminals of the switching chip 23 are connected in parallel, the I/O terminals output high level and low level, and the two I/O terminals can output four sets of high level and low level combinations, and through a set of high and low level The combination of the two values can determine which of the four radio frequency signal branch terminals the radio frequency signal terminal of the first multi-channel signal switching chip 23 is connected to. Similarly, the control output end of the single-chip and the control input end 241 of the second multi-channel signal switching chip are all three I/O terminals, and the three I/O terminals of the single-chip microcomputer are connected in parallel with the second multi-channel signal switching chip 24 , through a combination of a set of three values of high and low levels, it can be determined which of the four radio frequency signal branch terminals the radio frequency signal terminal of the second multi-channel signal switching chip 24 is connected to. It should be noted that all three I/O terminals of the second multi-channel signal switching chip 24 are connected in parallel with the three I/O terminals of the single-chip microcomputer 21 .

Further, the multi-channel RFID reader/writer 20 also includes a serial port line 26 . The serial port line 26 is respectively connected to the serial port of the RFID radio frequency module 22 and the serial port of the single-chip microcomputer 21 .

It should be noted that: the first multi-channel signal switching chip 23 can be separated from the RFID radio frequency module 22, or the first multi-channel signal switching chip 23 can be directly integrated in the RFID radio frequency module 22, as shown in Figure 3.

In the embodiment of the present utility model, by connecting the first multi-channel signal switching chip in series with the RFID radio frequency module, and connecting the second multi-channel signal switching chip in series on the first multi-channel signal switching chip, the radio frequency signal interface is greatly expanded, so that The RFID radio frequency module can mount more antennas, expand the number of antennas in the multi-channel RFID reader, and realize the control of multiple antennas by a multi-channel RFID reader, without the need to configure multiple RFIDs when multiple antennas need to be controlled. The reader/writer reduces the cost of project application and reduces the difficulty of system development.

The utility model also provides an implementation mode of the RFID identification system. Referring to FIG. 4 , the RFID identification system 30 includes a processor 301 , a multi-channel RFID reader 302 and an electronic tag 303 .

For the specific structure of the multi-channel RFID reader-writer 302, please refer to the implementation manner of the above-mentioned multi-channel RFID reader-writer, which will not be repeated here.

The processor 301 is connected with the single-chip microcomputer in the multi-channel RFID reader-writer 302, specifically, the processor 301 and the single-chip microcomputer can be connected in series, then the serial port of the processor 301 is connected with the serial port of the single-chip microcomputer, and the processor 301 and the single-chip microcomputer can be a network connected, then the network interface of the processor 301 is connected with the network interface of the single-chip microcomputer.

The electronic tag 303 is set on the object to be detected. The multi-channel RFID reader 302 amplifies the signal through its own antenna and sends it out. When the electronic tag 303 is found, the electronic tag is activated. After the electronic tag is activated, the data in the electronic tag The multi-channel RFID reader-writer 302 is transmitted back through the antenna, and the multi-channel RFID reader-writer 302 transmits the data back to the processor 301 for processing.

Further, the RFID identification system 30 also includes a display 304 connected to the processor 301 . . It is worth noting that: usually the display 304 and the processor 301 are assembled together, which is called a host computer.

In the embodiment of the present utility model, by connecting the first multi-channel signal switching chip in series with the RFID radio frequency module, and connecting the second multi-channel signal switching chip in series on the first multi-channel signal switching chip, the radio frequency signal interface is greatly expanded, so that The RFID radio frequency module can mount more antennas, expand the number of antennas in the multi-channel RFID reader, and realize the control of multiple antennas by one multi-channel RFID reader. The device reduces the cost of project application and reduces the difficulty of system development.

It should be noted that, the description of the utility model and the accompanying drawings have given the preferred implementation of the utility model, but the utility model can be realized in many different forms, and is not limited to the description in this specification. Embodiments, these embodiments are not used as additional restrictions on the content of the present utility model, and the purpose of providing these embodiments is to make the understanding of the disclosure of the present utility model more thorough and comprehensive. Moreover, the above-mentioned technical features continue to be combined with each other to form various implementations not listed above, which are all considered to be within the scope of the description of the utility model; furthermore, those of ordinary skill in the art can improve or improve according to the above description. Transformation, and all these improvements and transformations should belong to the protection scope of the appended claims of the present utility model.

Claims (10)

1. a hyperchannel rfid interrogator, is characterized in that, comprising:

Single-chip microcomputer, described single-chip microcomputer comprises control output end;

RFID radio-frequency module, described RFID radio-frequency module is connected with described single-chip microcomputer;

First multiple signals switch chip, the radiofrequency signal end that described first multiple signals switch chip is connected with the radiofrequency signal end of described RFID radio-frequency module, and the control input end that described first multiple signals switch chip is connected with the control output end of described RFID radio-frequency module;

Second multiple signals switch chip, the radiofrequency signal end that described second multiple signals switch chip is connected with the radiofrequency signal branch end that described first multiple signals switch chip, and the control input end that described second multiple signals switch chip is connected with the control output end of described single-chip microcomputer;

Antenna, the radiofrequency signal branch end that described antenna switches chip with described second multiple signals is connected.

2. hyperchannel rfid interrogator according to claim 1, is characterized in that,

It is four road signal switching chips that described first multiple signals switch chip, and the control input end that the control output end of described RFID radio-frequency module and the first multiple signals switch chip is two I/O ends;

It is eight road signal switching chips that described second multiple signals switch chip, and the control input end that the control output end of described single-chip microcomputer and the second multiple signals switch chip is three I/O ends.

3. hyperchannel rfid interrogator according to claim 2, is characterized in that,

The quantity of described eight road signal switching chips is four, and a radiofrequency signal branch end of described four road signal switching chips connects the radiofrequency signal end of eight road signal switching chips;

The quantity of described antenna is 32, and a radiofrequency signal branch end of described eight road signal switching chips connects an antenna.

4. hyperchannel rfid interrogator according to claim 1, is characterized in that, described hyperchannel rfid interrogator also comprises Serial Port Line;

Described Serial Port Line connects the serial ports of RFID radio-frequency module and the serial ports of single-chip microcomputer respectively.

5. a RFID recognition system, is characterized in that, described RFID recognition system comprises processor, hyperchannel rfid interrogator and electronic tag;

Described hyperchannel rfid interrogator comprises:

Single-chip microcomputer, described single-chip microcomputer comprises control output end;

RFID radio-frequency module, described RFID radio-frequency module is connected with described single-chip microcomputer;

First multiple signals switch chip, the radiofrequency signal end that described first multiple signals switch chip is connected with the radiofrequency signal end of described RFID radio-frequency module, and the control input end that described first multiple signals switch chip is connected with the control output end of described RFID radio-frequency module;

Second multiple signals switch chip, the radiofrequency signal end that described second multiple signals switch chip is connected with the radiofrequency signal branch end that described first multiple signals switch chip, and the control input end that described second multiple signals switch chip is connected with the control output end of described single-chip microcomputer;

Antenna, the radiofrequency signal branch end that described antenna switches chip with described second multiple signals is connected;

Described processor is connected with described single-chip microcomputer, and described electronic tag is arranged on detected material.

6. RFID recognition system according to claim 5, is characterized in that,

It is four road signal switching chips that described first multiple signals switch chip, and the control input end that the control output end of described RFID radio-frequency module and the first multiple signals switch chip is two I/O ends;

It is eight road signal switching chips that described second multiple signals switch chip, and the control input end that the control output end of described single-chip microcomputer and the second multiple signals switch chip is three I/O ends.

7. RFID recognition system according to claim 6, is characterized in that,

The quantity of described eight road signal switching chips is four, and a radiofrequency signal branch end of described four road signal switching chips connects the radiofrequency signal end of eight road signal switching chips;

The quantity of described antenna is 32, and a radiofrequency signal branch end of described eight road signal switching chips connects an antenna.

8. RFID recognition system according to claim 5, is characterized in that,

Described hyperchannel rfid interrogator also comprises Serial Port Line;

Described Serial Port Line connects the serial ports of RFID radio-frequency module and the serial ports of single-chip microcomputer respectively.

9. RFID recognition system according to claim 5, is characterized in that, described RFID recognition system comprises display;

Described display is connected with described processor.

10. RFID recognition system according to claim 5, is characterized in that, the serial ports end of described single-chip microcomputer is connected with the serial ports end of described processor.