RFID radio frequency reader-writer

Abstract

The utility model provides a radio frequency identification (RFID) radio frequency reader-writer, which relates to the field of RFID radio frequency reader-writers and comprises a baseband digital signal processing module, an analog radio frequency front-end module and a power supply module, and the power supply module is used for supplying power to the baseband digital signal processing module and the analog radio frequency front-end module. The analog radio frequency front-end module is electrically connected with the baseband digital signal processing module, the analog radio frequency front-end module comprises an RFID induction antenna, a radio frequency transmitter, a radio frequency receiver and a temperature protection circuit, the RFID induction antenna is electrically connected with the radio frequency transmitter, the RFID induction antenna is electrically connected with the radio frequency receiver, the radio frequency transmitter is electrically connected with the baseband digital signal processing module, and the temperature protection circuit is electrically connected with the baseband digital signal processing module. The radio frequency receiver is electrically connected with the baseband digital signal processing module, the temperature protection circuit is used for carrying out temperature protection on the radio frequency transmitter and the radio frequency receiver, and the radio frequency reader-writer has the advantage that the portability of the radio frequency reader-writer is improved.

Description

Technical Field

[0001] The utility model relates to the field of RFID radio frequency readers and writers, in particular to an RFID radio frequency reader and writer. Background Art

[0002] With the rapid development of the Internet of Things, information sharing, querying, and tracking have become cutting-edge technologies. As RFID core technology continues to develop and mature, its application areas are expanding, with applications in a wide range of fields, including military, aviation, warehousing and logistics, retail, industrial manufacturing, asset management, transportation, animal identification, and anti-counterfeiting and anti-theft. Therefore, having a stable, efficient, and reliable RFID reader is an inevitable requirement for using RFID technology in these fields.

[0003] Existing radio frequency readers have low integration, resulting in problems such as large size, heavy weight, high power consumption and cost, and inconvenience in carrying the radio frequency readers.

[0004] Therefore, it is necessary to provide an RFID radio frequency reader / writer to improve the portability of the radio frequency reader / writer. Utility Model Content

[0005] The utility model provides an RFID radio frequency reader / writer, comprising a baseband digital signal processing module, an analog radio frequency front-end module and a power supply module, wherein the power supply module is used to supply power to the baseband digital signal processing module and the analog radio frequency front-end module, and the analog radio frequency front-end module is electrically connected to the baseband digital signal processing module. The utility model is characterized in that the analog radio frequency front-end module comprises an RFID sensing antenna, a radio frequency transmitter, a radio frequency receiver and a temperature protection circuit, the RFID sensing antenna is electrically connected to the radio frequency transmitter, the RFID sensing antenna is electrically connected to the radio frequency receiver, the radio frequency transmitter is electrically connected to the baseband digital signal processing module, the radio frequency receiver is electrically connected to the baseband digital signal processing module, and the temperature protection circuit is used to perform temperature protection on the radio frequency transmitter and the radio frequency receiver.

[0006] Furthermore, the RF transmitter includes a voltage-controlled oscillator, a first mixer, a gain amplifier, a RF filter and a power amplifier, the output end of the voltage-controlled oscillator is electrically connected to the input end of the mixer, the output end of the first mixer is electrically connected to the input end of the gain amplifier, the output end of the gain amplifier is electrically connected to the input end of the RF filter, the output end of the RF filter is electrically connected to the output end of the power amplifier, and the power amplifier is electrically connected to the RFID sensing antenna through a circulator.

[0007] Furthermore, the RF receiver includes a RF amplifier, a second mixer and an intermediate frequency amplifier. The RF amplifier is used to amplify the RF signal received by the RFID sensing antenna. The output end of the RF amplifier is electrically connected to the input end of the second mixer, and the output end of the second mixer is electrically connected to the input end of the intermediate frequency amplifier.

[0008] Furthermore, the baseband digital signal processing module, analog RF front-end module and power supply module are arranged on a circuit board, and the circuit board includes a surface mount layer, a ground layer, a power wiring layer and a signal routing layer arranged in sequence from top to bottom. The baseband digital signal processing module, analog RF front-end module and power supply module are mounted on the surface mount layer, the ground layer is used to provide electrical grounding, the power wiring layer is used to lay out the power line, and the signal routing layer is used to lay out the signal line.

[0009] Furthermore, the temperature protection circuit includes a temperature acquisition circuit, a temperature control circuit and a power-off protection circuit. The temperature acquisition circuit is used to collect temperature signals of the RF transmitter and the RF receiver. The temperature control circuit is used to perform temperature control according to the signal output by the temperature acquisition circuit. The power-off protection circuit is used to perform power-off protection according to the signal output by the temperature acquisition circuit.

[0010] Furthermore, the temperature acquisition circuit includes a first temperature acquisition circuit, a second temperature acquisition circuit, a first OR gate, and a second OR gate. The circuit structures of the first temperature acquisition circuit and the second temperature acquisition circuit are consistent. The first temperature acquisition circuit is used to acquire the temperature signal of the RF transmitter, and the second temperature acquisition circuit is used to acquire the temperature signal of the RF receiver. The output end of the first temperature acquisition circuit and the output end of the second temperature acquisition circuit are respectively electrically connected to the two input ends of the first OR gate, and the output end of the first temperature acquisition circuit and the output end of the second temperature acquisition circuit are respectively electrically connected to the two input ends of the second OR gate.

[0011] Furthermore, the first temperature acquisition circuit includes a first temperature sensor, a first signal amplifier, a first voltage comparator and a second voltage comparator. The first temperature sensor is arranged on the RF receiver, the output end of the first temperature sensor is electrically connected to the input end of the first signal amplifier, the output end of the first signal amplifier is electrically connected to the non-inverting end of the first voltage comparator, the inverting end of the first voltage comparator is input with a first reference voltage, the output end of the first signal amplifier is electrically connected to the non-inverting end of the second voltage comparator, and the inverting end of the second voltage comparator is input with a second reference voltage, wherein the second reference voltage is greater than the first reference voltage; the output end of the first voltage comparator is electrically connected to one input end of the first OR gate, the output end of the third voltage comparator of the second temperature acquisition circuit is electrically connected to the other input end of the first OR gate; the output end of the second voltage comparator is electrically connected to one input end of the second OR gate, and the output end of the fourth voltage comparator of the second temperature acquisition circuit is electrically connected to the other input end of the second OR gate.

[0012] Furthermore, the temperature control circuit includes a first transistor switch and a refrigeration component, wherein the output end of the first OR gate is electrically connected to the base of the first transistor switch, and the first transistor switch is connected in series between the power module and the refrigeration component.

[0013] Furthermore, the refrigeration component includes a plurality of Peltier elements.

[0014] Furthermore, the power-off protection circuit includes a first NOT gate, a second triode switch, a second NOT gate, and a third triode switch, wherein the output end of the second OR gate is electrically connected to the input end of the first NOT gate, the output end of the first NOT gate is electrically connected to the base of the second triode switch, the output end of the second OR gate is electrically connected to the second NOT gate, the output end of the second NOT gate is electrically connected to the base of the third triode switch, the second triode switch is connected in series between the power module and the RF transmitter, and the third triode switch is connected in series between the power module and the RF receiver. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0016] Figure 1 This is a module diagram of an RFID radio frequency reader according to some embodiments of this specification;

[0017] Figure 2is a schematic diagram of a module of a radio frequency transmitter according to some embodiments of this specification;

[0018] Figure 3 is a schematic diagram of a module of a radio frequency receiver according to some embodiments of this specification;

[0019] Figure 4 This is a module schematic diagram of a temperature protection circuit according to some embodiments of this specification. DETAILED DESCRIPTION

[0020] To more clearly illustrate the technical solutions of the embodiments of this specification, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this specification. Those skilled in the art can apply this specification to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0021] Figure 1 is a schematic diagram of a module of an RFID radio frequency reader according to some embodiments of this specification, such as Figure 1 As shown, an RFID radio frequency reader may include a baseband digital signal processing module, an analog radio frequency front-end module and a power supply module, wherein the power supply module is used to power the baseband digital signal processing module and the analog radio frequency front-end module, the analog radio frequency front-end module is electrically connected to the baseband digital signal processing module, the analog radio frequency front-end module includes an RFID sensing antenna, a radio frequency transmitter, a radio frequency receiver and a temperature protection circuit, the RFID sensing antenna is electrically connected to the radio frequency transmitter, the RFID sensing antenna is electrically connected to the radio frequency receiver, the radio frequency transmitter is electrically connected to the baseband digital signal processing module, the radio frequency receiver is electrically connected to the baseband digital signal processing module, and the temperature protection circuit is used to perform temperature protection on the radio frequency transmitter and the radio frequency receiver.

[0022] Specifically, the baseband digital signal processing module is primarily responsible for digital signal processing tasks such as signal encoding, decoding, modulation, and demodulation. The primary component of the baseband digital signal processing module is the baseband digital signal processing chip, for example, the Philips MFRC522. In this embodiment, the baseband digital signal processing module is based on existing technology and will not be further described here.

[0023] Figure 2 is a schematic diagram of a module of a radio frequency transmitter according to some embodiments of this specification, such as Figure 2As shown, the RF transmitter includes a voltage-controlled oscillator, a first mixer, a gain amplifier, a RF filter and a power amplifier. The output end of the voltage-controlled oscillator is electrically connected to the input end of the mixer, the output end of the first mixer is electrically connected to the input end of the gain amplifier, the output end of the gain amplifier is electrically connected to the input end of the RF filter, the output end of the RF filter is electrically connected to the output end of the power amplifier, and the power amplifier is electrically connected to the RFID sensing antenna through a circulator.

[0024] Specifically, the voltage-controlled oscillator is used to provide a local oscillation signal to the mixer, the mixer is used to receive the local oscillation signal and the baseband modulation signal and generate a radio frequency signal, the gain amplifier is used to amplify the radio frequency signal output by the mixer, the radio frequency filter filters the radio frequency signal output by the gain amplifier, the power amplifier amplifies the power of the signal output by the radio frequency filter, and transmits the signal output by the power amplifier through the RFID sensing antenna.

[0025] Figure 3 is a schematic diagram of a module of a radio frequency receiver according to some embodiments of this specification, such as Figure 3 As shown, the RF receiver includes an RF amplifier, a second mixer and an intermediate frequency amplifier. The RF amplifier is used to amplify the RF signal received by the RFID sensing antenna. The output end of the RF amplifier is electrically connected to the input end of the second mixer, and the output end of the second mixer is electrically connected to the input end of the intermediate frequency amplifier.

[0026] Specifically, the RF signal received by the antenna or RF front-end circuit is first amplified by the RF amplifier. The amplified RF signal is then sent to the second mixer, where it is mixed with the signal generated by the local oscillator to produce an intermediate frequency (IF) signal. The IF signal is then sent to the IF amplifier for further amplification. Finally, the amplified IF signal is sent to the subsequent baseband digital signal processing module for further processing.

[0027] In some embodiments, the baseband digital signal processing module, the analog RF front-end module and the power module are arranged on a circuit board, which includes a surface mount layer, a ground layer, a power wiring layer and a signal routing layer arranged in sequence from top to bottom. The baseband digital signal processing module, the analog RF front-end module and the power module are mounted on the surface mount layer. The ground layer is used to provide electrical grounding, the power wiring layer is used to lay out the power line, and the signal routing layer is used to lay out the signal line.

[0028] Specifically, the ground layer provides electrical grounding, ensuring circuit stability and safety. The power routing layer is used to lay out power lines, providing the required power to the various baseband digital signal processing modules and analog RF front-end modules. The signal routing layer, located at the bottom layer, is used to lay out signal lines, enabling signal transmission between the various baseband digital signal processing modules and analog RF front-end modules.

[0029] Figure 4 is a module diagram of a temperature protection circuit according to some embodiments of this specification, such as Figure 4 As shown, the temperature protection circuit includes a temperature acquisition circuit, a temperature control circuit, and a power-off protection circuit. The temperature acquisition circuit is used to acquire temperature signals from the RF transmitter and the RF receiver. The temperature control circuit is used to perform temperature control based on the signal output by the temperature acquisition circuit. The power-off protection circuit is used to perform power-off protection based on the signal output by the temperature acquisition circuit. The temperature acquisition circuit includes a first temperature acquisition circuit, a second temperature acquisition circuit, a first OR gate, and a second OR gate. The first and second temperature acquisition circuits have the same circuit structure. The first temperature acquisition circuit is used to acquire the temperature signal from the RF transmitter, while the second temperature acquisition circuit is used to acquire the temperature signal from the RF receiver. The output of the first and second temperature acquisition circuits are respectively electrically connected to the two inputs of the first OR gate, and the output of the first and second temperature acquisition circuits are respectively electrically connected to the two inputs of the second OR gate. The first temperature acquisition circuit includes a first temperature sensor, a first signal amplifier, a first voltage comparator, and a second voltage comparator. The first temperature sensor is disposed on the radio frequency receiver. The output of the first temperature sensor is electrically connected to the input of the first signal amplifier. The output of the first signal amplifier is electrically connected to the non-inverting terminal of the first voltage comparator. A first reference voltage is input to the inverting terminal of the first voltage comparator. The output of the first signal amplifier is electrically connected to the inverting terminal of the second voltage comparator. A second reference voltage is input to the non-inverting terminal of the second voltage comparator, wherein the second reference voltage is greater than the first reference voltage. The output of the first voltage comparator is electrically connected to one input of a first OR gate. The output of the third voltage comparator of the second temperature acquisition circuit is electrically connected to the other input of the first OR gate. The output of the second voltage comparator is electrically connected to one input of the second OR gate. The output of the fourth voltage comparator of the second temperature acquisition circuit is electrically connected to the other input of the second OR gate. The temperature control circuit includes a first transistor switch and a cooling assembly. The output of the first OR gate is electrically connected to the base of the first transistor switch. The first transistor switch is connected in series between the power module and the cooling assembly. The power-off protection circuit includes a second triode switch and a third triode switch, wherein the output end of the second OR gate is electrically connected to the base of the second triode switch, the output end of the second OR gate is electrically connected to the base of the third triode switch, the second triode switch is connected in series between the power module and the RF transmitter, and the third triode switch is connected in series between the power module and the RF receiver.

[0030] Specifically, when the temperature of the RF transmitter sensed by the first temperature sensor is higher than a preset first temperature threshold, the voltage input to the non-inverting terminal of the first voltage comparator is greater than a first reference voltage, and the first voltage comparator outputs a high level to the first OR gate. When the temperature of the RF receiver sensed by the second temperature sensor is higher than a preset second temperature threshold, the voltage input to the non-inverting terminal of the second voltage comparator is greater than a second reference voltage, and the second voltage comparator outputs a high level to the first OR gate. When a high level is input to any one of the input terminals of the first OR gate, the first OR gate outputs a high level, turning on the first transistor switch, energizing the refrigeration component to perform cooling operations.

[0031] When the temperature of the RF transmitter sensed by the first temperature sensor exceeds a preset second temperature threshold, the voltage input to the non-inverting terminal of the third voltage comparator exceeds the second reference voltage, and the third voltage comparator outputs a high level to the second OR gate. When the temperature of the RF receiver sensed by the second temperature sensor exceeds the preset second temperature threshold, the voltage input to the non-inverting terminal of the fourth voltage comparator exceeds the second reference voltage, and the fourth voltage comparator outputs a high level to the second OR gate. When a high level is input to either input terminal of the second OR gate, the second OR gate outputs a high level to the first NOT gate and the second NOT gate, turning off the second and third transistor switches, de-energizing the RF transmitter and receiver, and stopping power supply.

[0032] Finally, it should be understood that the embodiments described in this specification are intended only to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly described and illustrated in this specification.

Claims

1. An RFID radio frequency reader, comprising a baseband digital signal processing module, an analog radio frequency front-end module and a power supply module, wherein: The power supply module is used to supply power to the baseband digital signal processing module and the analog RF front-end module, and the analog RF front-end module is electrically connected to the baseband digital signal processing module. It is characterized in that the analog RF front-end module includes an RFID sensing antenna, a RF transmitter, a RF receiver and a temperature protection circuit. The RFID sensing antenna is electrically connected to the RF transmitter, the RFID sensing antenna is electrically connected to the RF receiver, the RF transmitter is electrically connected to the baseband digital signal processing module, and the RF receiver is electrically connected to the baseband digital signal processing module. The temperature protection circuit is used to perform temperature protection on the RF transmitter and the RF receiver.

2. The RFID radio frequency reader according to claim 1, characterized in that: The RF transmitter includes a voltage-controlled oscillator, a first mixer, a gain amplifier, a RF filter and a power amplifier. The output end of the voltage-controlled oscillator is electrically connected to the input end of the mixer, the output end of the first mixer is electrically connected to the input end of the gain amplifier, the output end of the gain amplifier is electrically connected to the input end of the RF filter, the output end of the RF filter is electrically connected to the output end of the power amplifier, and the power amplifier is electrically connected to the RFID sensing antenna through a circulator.

3. The RFID radio frequency reader according to claim 1, characterized in that: The RF receiver includes a RF amplifier, a second mixer and an intermediate frequency amplifier. The RF amplifier is used to amplify the RF signal received by the RFID sensing antenna. The output end of the RF amplifier is electrically connected to the input end of the second mixer, and the output end of the second mixer is electrically connected to the input end of the intermediate frequency amplifier.

4. The RFID radio frequency reader according to claim 1, characterized in that: The baseband digital signal processing module, analog RF front-end module and power module are arranged on a circuit board, which includes a surface mount layer, a ground layer, a power wiring layer and a signal routing layer arranged in sequence from top to bottom. The baseband digital signal processing module, analog RF front-end module and power module are mounted on the surface mount layer. The ground layer is used to provide electrical grounding, the power wiring layer is used to lay out the power line, and the signal routing layer is used to lay out the signal line.

5. The RFID radio frequency reader according to any one of claims 1 to 4, characterized in that: The temperature protection circuit includes a temperature acquisition circuit, a temperature control circuit and a power-off protection circuit. The temperature acquisition circuit is used to acquire temperature signals from the RF transmitter and the RF receiver. The temperature control circuit is used to perform temperature control according to the signal output by the temperature acquisition circuit. The power-off protection circuit is used to perform power-off protection according to the signal output by the temperature acquisition circuit.

6. The RFID radio frequency reader according to claim 5, characterized in that: The temperature acquisition circuit includes a first temperature acquisition circuit, a second temperature acquisition circuit, a first OR gate, and a second OR gate. The first temperature acquisition circuit and the second temperature acquisition circuit have the same circuit structure. The first temperature acquisition circuit is used to acquire the temperature signal of the RF transmitter, and the second temperature acquisition circuit is used to acquire the temperature signal of the RF receiver. The output end of the first temperature acquisition circuit and the output end of the second temperature acquisition circuit are respectively electrically connected to the two input ends of the first OR gate, and the output end of the first temperature acquisition circuit and the output end of the second temperature acquisition circuit are respectively electrically connected to the two input ends of the second OR gate.

7. The RFID radio frequency reader according to claim 6, characterized in that: The first temperature acquisition circuit includes a first temperature sensor, a first signal amplifier, a first voltage comparator, and a second voltage comparator. The first temperature sensor is disposed on the RF receiver. The output end of the first temperature sensor is electrically connected to the input end of the first signal amplifier. The output end of the first signal amplifier is electrically connected to the non-inverting end of the first voltage comparator. A first reference voltage is input to the inverting end of the first voltage comparator. The output end of the first signal amplifier is electrically connected to the non-inverting end of the second voltage comparator. A second reference voltage is input to the inverting end of the second voltage comparator. The second reference voltage is greater than the first reference voltage. The output terminal of the first voltage comparator is electrically connected to one input terminal of the first OR gate, and the output terminal of the third voltage comparator of the second temperature acquisition circuit is electrically connected to the other input terminal of the first OR gate; The output terminal of the second voltage comparator is electrically connected to one input terminal of the second OR gate, and the output terminal of the fourth voltage comparator of the second temperature acquisition circuit is electrically connected to the other input terminal of the second OR gate.

8. The RFID radio frequency reader according to claim 7, characterized in that: The temperature control circuit includes a first transistor switch and a refrigeration component, wherein the output end of the first OR gate is electrically connected to the base of the first transistor switch, and the first transistor switch is connected in series between the power module and the refrigeration component.

9. The RFID radio frequency reader according to claim 8, characterized in that: The cooling assembly includes a plurality of Peltier elements.

10. The RFID radio frequency reader according to claim 7, characterized in that: The power-off protection circuit includes a first NOT gate, a second triode switch, a second NOT gate, and a third triode switch, wherein the output end of the second OR gate is electrically connected to the input end of the first NOT gate, the output end of the first NOT gate is electrically connected to the base of the second triode switch, the output end of the second OR gate is electrically connected to the second NOT gate, the output end of the second NOT gate is electrically connected to the base of the third triode switch, the second triode switch is connected in series between the power module and the RF transmitter, and the third triode switch is connected in series between the power module and the RF receiver.

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