CN213484868U

CN213484868U - Radio frequency identification device

Info

Publication number: CN213484868U
Application number: CN202021878470.5U
Authority: CN
Inventors: 戴亢亢; 廖鸿文; 方世煌
Original assignee: Kunshan Xinwulian Electronic Communications Co ltd
Current assignee: Kunshan Xinwulian Electronic Communications Co ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-06-18
Anticipated expiration: 2030-09-01

Abstract

The utility model provides a radio frequency identification device, it includes: the antenna module, the analog signal amplification module and the analog-to-digital conversion module are connected in sequence; the antenna module is used for receiving an analog signal; the analog signal amplification module includes: a UCC27424D chip; the analog-to-digital conversion module comprises a TMS3705 chip. The utility model discloses utilize analog signal to enlarge the module and enlarge antenna received analog signal to the distinguishable scope of analog signal has effectively been increased.

Description

Radio frequency identification device

Technical Field

The utility model relates to a signal identification field, concretely relates to radio frequency identification device.

Background

In recent years, the internet of things is a new technology which people generally pay attention to, and a radio frequency identification technology is rapidly developed as a key technology of the internet of things. Radio Frequency Identification (RFID) technology is an automatic Identification technology. It uses radio frequency mode to make non-contact two-way communication so as to attain the goal of identification and exchange data.

In practice, the used high-frequency active sources are all single-antenna, the emitting distance of the active sources is usually about 5cm, the signal range is small, the active sources can not be activated easily to the label, so that the signal intensity of the label in different directions is inconsistent, even no signal exists, and the RFID in the prior art is designed on the circuit board in a customized mode, and once the RFID is damaged, the whole board needs to be replaced, and the portability is poor when the product is researched and developed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a radio frequency identification device.

A radio frequency identification device, comprising: the antenna module, the analog signal amplification module and the analog-to-digital conversion module are connected in sequence;

the antenna module is used for receiving an analog signal; the analog signal amplification module includes: a UCC27424D chip; the analog-to-digital conversion module comprises a TMS3705 chip.

The analog signal amplification module further comprises: a first filter circuit;

the first filter circuit includes: a sixth capacitor and a seventh capacitor;

one end of the seventh capacitor is connected with a power supply end of the UCC27424D chip, one end of the sixth capacitor, the first enabling end and the second enabling end respectively, and the other ends of the seventh capacitor and the sixth capacitor are grounded;

and a 12V direct-current power supply is arranged between the sixth capacitor and the first enabling end.

A rectifying circuit is arranged between the antenna module and the analog signal amplification module;

the rectifier circuit includes: the circuit comprises a first diode, a second diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, a third resistor, a fourth resistor and a ninth resistor;

one end of the first capacitor is connected with the second input end of the antenna module, the other end of the first capacitor is respectively connected with one ends of the second diode, the third capacitor and the fourth resistor, the other ends of the second diode and the third capacitor are grounded, and the other end of the fourth resistor is connected with the first output end of the analog signal amplification module;

one end of the fifth capacitor is connected with the first input end of the antenna module and one end of the ninth resistor, the other end of the fifth capacitor is connected with the other end of the ninth resistor, the first diode, the second capacitor and one end of the third resistor, the first diode and the other end of the second capacitor are grounded, and the other end of the third resistor is connected with the second output end of the analog signal amplification module.

And a third input end of the antenna module is connected with the analog input end and the analog output end of the TMS3705 chip.

And a first resistor is arranged between the third input end of the antenna module and the analog input end of the TMS3705 chip.

And a second resistor is arranged between the first resistor and the analog output end of the TMS3705 chip.

The first input end of the UCC27424D chip is connected with the first analog driving output end of the TMS3705 chip, and the second input end of the UCC27424D chip is connected with the second analog driving output end of the TMS3705 chip.

The analog-to-digital conversion module further includes: a second filter circuit and a crystal oscillator circuit;

the second filter circuit is connected with a power supply end of the TMS3705 chip;

the crystal oscillator circuit is connected with a crystal oscillator end of the TMS3705 chip.

Compared with the closest prior art, the utility model provides a technical scheme has following beneficial effect:

the utility model utilizes the analog signal amplification module to amplify the analog signal received by the antenna, thereby effectively increasing the recognizable range of the analog signal; furthermore, the utility model discloses still can combine with the main circuit of difference through digital end interface, make the main circuit can be with through unnecessary code program for the interface the utility model discloses a function is added wherein, and not only portability is strong, still simplifies the product design, research and development process with higher speed.

Drawings

Fig. 1 is a schematic diagram of an antenna module SMA1 and an analog signal amplification module according to the present invention;

fig. 2 is a schematic diagram of an analog-to-digital conversion module according to the present invention.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the drawings.

The utility model discloses can include: the antenna module, the analog signal amplification module and the analog-to-digital conversion module are connected in sequence; the antenna module is used for receiving analog signals; the analog signal amplification module includes: a UCC27424D chip; the analog-to-digital conversion module comprises a TMS3705 chip.

As shown in fig. 1, the antenna module SMA1 and the analog signal amplifying module of the present invention may further include: a first filter circuit; wherein the first filter circuit may include: a sixth capacitance C6 and a seventh capacitance C7; one end of the seventh capacitor is connected to the power supply terminal VDD of the UCC27424D chip, one end of the sixth capacitor C6, the first enable terminal ENBA, and the second enable terminal ENBB, respectively, and the other ends of the seventh capacitor C7 and the sixth capacitor C6 are grounded. Further, a 12V dc power supply is provided between the sixth capacitor C6 and the first enable terminal ENBA.

A rectifying circuit is arranged between the antenna module and the analog signal amplification module; the rectifier circuit may include: a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fifth capacitor C5, a third resistor R3, a fourth resistor R4 and a ninth resistor R9; one end of the first capacitor C1 is connected to the second input end of the antenna module, the other end of the first capacitor C1 is connected to one ends of the second diode D2, the third capacitor C3 and the fourth resistor R4, the other ends of the second diode D2 and the third capacitor C3 are grounded, and the other end of the fourth resistor R4 is connected to the first output end of the analog signal amplification module; one end of a fifth capacitor C5 is connected to the first input end of the antenna module and one end of a ninth resistor R9, the other end of the fifth capacitor C5 is connected to the other end of the ninth resistor R9, one end of a first diode D1, one end of a second capacitor C2, and one end of a third resistor R3, the other ends of the first diode D1 and the second capacitor C2 are grounded, and the other end of the third resistor R3 is connected to the second output end of the analog signal amplification module.

The analog-to-digital conversion module shown in fig. 2, wherein the third input terminal of the antenna module is connected to the analog input terminal and the analog output terminal of the TMS3705 chip in the analog-to-digital conversion module. And a first resistor R1 is arranged between the third input end of the antenna module and the analog input end of the TMS3705 chip. And a second resistor R2 is arranged between the first resistor and the analog output end of the TMS3705 chip. The first input terminal INA of the UCC27424D chip is connected to the first analog driving output terminal ANT1 of the TMS3705 chip, and the second input terminal INB of the UCC27424D chip is connected to the second analog driving output terminal ANT2 of the TMS3705 chip.

The analog-to-digital conversion module may further include: a second filter circuit and a crystal oscillator circuit; the second filter circuit is connected with a power supply end of the TMS3705 chip; and the crystal oscillator circuit is connected with a crystal oscillator end of the TMS3705 chip.

Then, the data demodulation part receives the digital signal output by the TMS3705 chip and sends the digital signal to the control logic. Control logic accepts instructions to perform storage, send data, or other operations. The EEPROM is used to store the ID number of the electronic tag and other user data.

Wherein, the utility model discloses a radio frequency card that radio frequency identification system adopted is RFM001 read-write card, wants the development of accurate completion radio frequency identification system, must know the read-write characteristic of the radio frequency card who uses. These characteristics include: memory allocation for EEPROM, card synchronization signals, transmission frequency, card control logic, command formats for writing cards and other card operations, etc.

1) Storage format of data in RFM001 radio frequency card

Contains 14bytes of data from Start byte.

2) RFM001 radio frequency card writing format

To write user data to the RFM001 radio card, the following format must be followed.

The data of the user data area may be completely decided by the user, but it is recommended to check the data using a CRC check of the 2byte check code. So for 10 bytes of user data, the first 8 bytes are used as user data and the second 2 bytes are used as CRC check code for the user data.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and those skilled in the art can still modify or substitute the specific embodiments of the present invention with reference to the above embodiments, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are all within the scope of the claims of the present invention pending.

Claims

1. A radio frequency identification device, comprising: the antenna module, the analog signal amplification module and the analog-to-digital conversion module are connected in sequence;

the antenna module is used for receiving an analog signal; the analog signal amplification module includes: a UCC27424D chip; the analog-to-digital conversion module comprises a TMS3705 chip;

the third input end of the antenna module is connected with the analog input end and the analog output end of a TMS3705 chip in the analog-to-digital conversion module;

the data demodulation part receives the digital signal output by the TMS3705 chip and sends the digital signal to the control logic;

2. The rfid device of claim 1, wherein the analog signal amplification module further comprises: a first filter circuit;

the first filter circuit includes: a sixth capacitor and a seventh capacitor;

3. The rfid device of claim 1 or 2, wherein a rectifying circuit is disposed between the antenna module and the analog signal amplifying module;

4. The rfid device of claim 2, wherein the third input of the antenna module is coupled to an analog input and an analog output of the TMS3705 chip.

5. The RFID device of claim 2 or 4, wherein a first resistor is disposed between the third input terminal of the antenna module and the analog input terminal of the TMS3705 chip.

6. The RFID device of claim 5, wherein a second resistor is disposed between the first resistor and an analog output of the TMS3705 chip.

7. The radio frequency identification device according to claim 1, wherein the analog-to-digital conversion module further comprises: a second filter circuit and a crystal oscillator circuit;