CN212413155U

CN212413155U - UHF RFID discrete component read-write module

Info

Publication number: CN212413155U
Application number: CN202021993569.XU
Authority: CN
Inventors: 薛玉兵
Original assignee: Nanjing Liujiayi Intelligent Technology Co ltd
Current assignee: Nanjing Liujiayi Intelligent Technology Co ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-01-26
Anticipated expiration: 2030-09-11

Abstract

The utility model relates to a UHF RFID discrete component read-write module, which comprises a main control unit, a phase-locked loop, a transmitting link and a receiving link; the main control unit receives a command sent by an upper computer connected with the main control unit, and the main control unit is respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls a phase-locked loop to lock signal frequency, the phase-locked loop modulates carrier signals, a transmitting link comprises a power-controllable amplifying circuit which amplifies the power of the carrier signals to the power set by the main control unit, a receiving link receives the signals of the transmitting link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to an upper computer. The utility model has the advantages of long recognition distance and high reading and writing speed; and the design and manufacturing cost can be greatly reduced.

Description

UHF RFID discrete component read-write module

Technical Field

The utility model relates to a radio frequency identification field, in particular to UHF RFID discrete component read-write module.

Background

The mainstream direction of the current read-write module used at home and abroad is based on R2000 of England, AS3992 of Austrian microelectronics or integrated chips produced by domestic companies AS platforms, the integration level is high, the design and development are convenient, but the relative cost is high.

Meanwhile, the UHF RFID module technology built by discrete elements at home and abroad is mainly oriented to a zero intermediate frequency mixing framework and is consistent with an internal framework of an integrated chip. One path of radio frequency signals generated by the front-end signal generator is transmitted out as data carriers through the power amplifier, and the other path of radio frequency signals is provided to the frequency mixer as local oscillation signals and is mixed with radio frequency receiving signals to obtain zero intermediate frequency signals. The main problem of the architecture is that the signal power of the transmit signal leaking to the receive link is much larger than the power of the receive signal, and circuits such as self-interference cancellation must be added to improve the receive sensitivity of the module, thereby increasing the hardware cost and the workload of software, and the hardware of the architecture includes a power divider, a mixer or a quadrature demodulator with higher cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides a UHF RFID discrete component read-write module for solving the above problems, which not only has long identification distance and fast read-write speed; and the design and manufacturing cost can be greatly reduced.

To achieve the above object, the present invention is implemented as follows: a UHF RFID discrete component read-write module comprises a main control unit, a phase-locked loop, a transmitting link and a receiving link; the main control unit receives a command sent by an upper computer connected with the main control unit, and the main control unit is respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls a phase-locked loop to lock signal frequency, the phase-locked loop modulates carrier signals, a transmitting link comprises a power-controllable amplifying circuit connected with the phase-locked loop to amplify the power of the carrier signals to the power set by the main control unit, a receiving link receives the signals of the transmitting link connected with the receiving link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to an upper computer.

The main control unit comprises a data communication unit, a coding and decoding unit and a link control unit connected with a phase-locked loop and a power controllable amplifying circuit.

In a further preferred embodiment, the phase locked loop comprises a VCO (voltage controlled oscillator) connected to the power controllable amplifier circuit and a loop filter.

The further optimization scheme is that the transmitting link further comprises a channel isolation unit connected with the power controllable amplifying circuit and a phase deflection unit connected with the channel isolation unit.

The further optimization scheme is that the receiving link comprises an envelope detection unit, a differential amplification unit and a voltage comparison unit which are sequentially connected, the envelope detection unit is connected with the phase deflection unit, and the voltage comparison unit is connected with the main control unit.

In a further preferred embodiment, the envelope detection unit includes a schottky diode for detecting the modulated signal.

Compare prior art, the utility model has the advantages of it is following: the utility model discloses UHF RFID discrete component read-write module possesses that the discernment distance is far away, read-write speed is fast, once only read many labels, low-cost and high acceptance sensitivity, can greatly reduced design cost of manufacture.

The utility model discloses integrated chip such as ware, directional coupler, quadrature modulator, mixer are divided to the merit in the removal mainstream frame. And a zero intermediate frequency detection scheme is adopted to replace a mixing frame, so that the cost of main stream frame hardware is greatly reduced.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of the overall structure of the UHF RFID discrete component read/write module of the present invention.

Detailed Description

The specific embodiment is as follows:

referring to fig. 1, a UHF RFID discrete component read-write module includes a main control unit, a phase-locked loop, a transmitting link and a receiving link; the main control unit receives a command sent by an upper computer connected with the main control unit, and the main control unit is respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls the frequency of a phase-locked loop locking signal, and comprises a data communication unit, a coding and decoding unit and a link control unit connected with the phase-locked loop and the power-controllable amplifying circuit. The phase-locked loop comprises a VCO (voltage controlled oscillator) and a loop filter which are connected with the power controllable amplifying circuit, the phase-locked loop modulates a carrier signal, and the transmitting link comprises the power controllable amplifying circuit which amplifies the power of the carrier signal to the power set by the main control unit, a channel isolation unit connected with the power controllable amplifying circuit and a phase deflection unit connected with the channel isolation unit. The receiving link comprises an envelope detection unit, a differential amplification unit and a voltage comparison unit which are sequentially connected, the envelope detection unit is connected with the transmitting link, and the voltage comparison unit is connected with the main control unit; the envelope detection unit comprises a Schottky diode for detecting the modulation signal; the receiving link receives signals of the transmitting link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to the upper computer.

The main control unit of the utility model is mainly responsible for the data communication function with the successor unit; meanwhile, the phase-locked loop is responsible for controlling the signal frequency required by the phase-locked loop locking by using I2C, regulating the power of a transmitted signal and modulating and demodulating the signal; the phase-locked loop is mainly responsible for generating a carrier signal required by modulation, the frequency stability of the phase-locked loop determines the performance of the whole hardware, the frequency controllability of the phase-locked loop is realized by using the main control unit, and the bandwidth required by a protocol is met; the power controllable amplifying circuit is mainly responsible for amplifying the power of the carrier signal to the power formulated by the main control unit, and the power amplifier has good conversion efficiency and gain linearity; the channel isolation mainly functions to increase the signal isolation between the transmitting and receiving links; the receiving chain is mainly responsible for envelope detection and signal amplification and comparison.

The utility model discloses the working process is as follows: the utility model discloses UHF RFID discrete component read-write module, main control unit receive the order that the host computer sent, start corresponding module task, main control unit is inside encodes the protocol stack order that corresponding task corresponds, sends to the radio frequency link and modulates; meanwhile, the main control unit configures a phase-locked loop and a power amplifying circuit according to the task command; the modulated signal is transmitted to a reader antenna after being amplified by power and sent out; the tag receives the carrier wave sent by the reader-writer antenna, obtains energy to wake up work, executes the received read-write module command at the same time, and sends the returned response information to the reader-writer antenna. And after the phase of the return signal is adjusted, the modulation signal is detected by a Schottky diode to obtain a T/Q double-path digital baseband signal, the T/Q double-path digital baseband signal is amplified and combined into a single-path baseband signal in a voltage comparator, the single-path baseband signal enters a main control unit for demodulation to obtain label information, and the main control unit transmits the label information to an upper computer.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A UHF RFID discrete component read-write module is characterized in that: the device comprises a main control unit, a phase-locked loop, a transmitting link and a receiving link; the main control unit receives a command sent by an upper computer connected with the main control unit, and the main control unit is respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls a phase-locked loop to lock signal frequency, the phase-locked loop modulates carrier signals, a transmitting link comprises a power-controllable amplifying circuit connected with the phase-locked loop to amplify the power of the carrier signals to the power set by the main control unit, a receiving link receives the signals of the transmitting link connected with the receiving link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to an upper computer.

2. The UHF RFID discrete component read-write module of claim 1, wherein: the main control unit comprises a data communication unit, a coding and decoding unit and a link control unit connected with a phase-locked loop and a power controllable amplifying circuit.

3. The UHF RFID discrete component read-write module of claim 1, wherein: the phase locked loop comprises a VCO and a loop filter connected to a power controllable amplification circuit.

4. The UHF RFID discrete component read-write module of claim 1, wherein: the transmitting chain also comprises a channel isolation unit connected with the power controllable amplifying circuit and a phase deflection unit connected with the channel isolation unit.

5. The UHF RFID discrete component read-write module of claim 4, wherein: the receiving link comprises an envelope detection unit, a differential amplification unit and a voltage comparison unit which are sequentially connected, the envelope detection unit is connected with the phase deflection unit, and the voltage comparison unit is connected with the main control unit.

6. The UHF RFID discrete component read-write module of claim 5, wherein: the envelope detection unit includes a schottky diode that detects the modulated signal.