CN118095325A - High concurrency RFID read-write system and device suitable for cold chain logistics - Google Patents
High concurrency RFID read-write system and device suitable for cold chain logistics Download PDFInfo
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Abstract
The application relates to a high concurrency RFID read-write system and device suitable for cold chain logistics, which relates to the field of RFID read-write systems and comprises a radio frequency module, a main control module and a temperature control module, wherein the radio frequency module comprises a plurality of groups of radio frequency units, each group of radio frequency units is provided with a unit identifier, each group of radio frequency units is pre-provided with different frequency intervals, and the different radio frequency units can simultaneously transmit and receive radio frequency signals with different frequencies according to the different frequency intervals. The radio frequency module is in bidirectional communication connection with the main control module to exchange read-write data, and meanwhile, the main control module exchanges information with the outside. The temperature control module is connected with the radio frequency module and the main control module, and is used for respectively collecting the temperatures of the radio frequency module and the main control module, and the temperature control module is used for heating according to the collected temperatures, so that the radio frequency module and the main control module can work normally. The application has the effect of improving the read-write efficiency of the RFID read-write device in a low-temperature environment.
Description
Technical Field
The application relates to the field of RFID read-write devices, in particular to a high concurrency RFID read-write system and device suitable for cold chain logistics.
Background
Radio Frequency Identification (RFID) is a method for identifying a specific object by radio signals and reading and writing related data, and the basic principle is to automatically identify the identified object by using transmission characteristics of radio frequency signals and spatial coupling (inductive or electromagnetic coupling) or radar reflection.
RFID identification systems typically include an antenna-integrated RFID reader and an electronic tag. The RFID read-write device performs wireless communication with the RFID electronic tag through the antenna, and can realize read-out or write-in operation of the tag identification code and the memory data. The current read-write device comprises an RFID radio frequency module, a control unit and an antenna. The electronic tag and the RFID read-write device realize the space (non-contact) coupling of radio frequency signals through the coupling element, and realize the transmission and the data exchange in the coupling channel according to the time sequence relationship.
Aiming at the related technology, in the case of multiple antennas, a change-over switch is usually added at the tail end of the RFID radio frequency module, and the change-over is carried out through a multiplexer, and one path is selected for processing, so that the reading and writing efficiency is lower.
Disclosure of Invention
In order to improve the read-write efficiency of the RFID read-write device, the application provides a high concurrency RFID read-write system and device suitable for cold chain logistics.
The application provides a high concurrency RFID read-write system and a device suitable for cold chain logistics, which adopts the following technical scheme:
On one hand, the high concurrency RFID read-write system suitable for cold chain logistics comprises a radio frequency module and a main control module, wherein the radio frequency module is in bidirectional communication connection with the main control module;
The system comprises a radio frequency module and a main control module, wherein the radio frequency module is in bidirectional communication connection with the main control module;
The radio frequency module comprises a plurality of groups of radio frequency units, each group of radio frequency units is provided with a unit identifier, each group of radio frequency units comprises an antenna unit and a processing unit, and the antenna units in each group of radio frequency units are connected with the processing units in the group to exchange signals; each antenna unit comprises a frequency selection circuit, a plurality of frequency selection circuits are preset with different frequency intervals, and the frequency selection circuits limit the antenna units to transmit and receive radio frequency signals with different frequencies according to the corresponding frequency intervals; the processing unit receives the received signal output by the antenna unit, converts the received signal to obtain read data, binds the read data with a unit identifier and outputs the read data to the main control module, and the processing unit receives the write data output by the main control module, converts the write data to obtain a transmitting signal and outputs the transmitting signal to the antenna unit;
The main control module comprises a communication unit and a control unit, wherein the communication unit is used for exchanging information with the outside, receiving write information with a unit identifier input by the outside and outputting the write information to the control unit, receiving read information with the unit identifier and outputting the read information to the outside; the control unit is in bidirectional communication connection with the communication unit and the processing unit, receives the read data with the unit identifier, processes the read data to obtain read information, outputs the read information with the unit identifier to the communication unit, receives the write information with the unit identifier, processes the write information to obtain write data, and outputs the write data to the corresponding processing unit according to the bound unit identifier.
By adopting the technical scheme, the read-write system realizes the simultaneous operation of a plurality of antenna units through a plurality of groups of radio frequency units in the radio frequency module, realizes the high-concurrency read-write operation, and improves the read-write efficiency and the stability of the system. Each antenna unit limits the receiving and transmitting of radio frequency signals with different frequencies through the frequency selection circuit, so that signal interference among different antenna units is avoided, and the stability of the system is improved.
Optionally, the processing unit includes a duplexer, an amplifying circuit and a modem, where the amplifying circuit includes an input amplifier and an output amplifier, an RX end of the duplexer is connected to an input end of the input amplifier, a TX end of the duplexer is connected to an output end of the output amplifier, and an ANT end of the duplexer is connected to the antenna unit to exchange a received signal; the output end of the input amplifier and the input end of the output amplifier are connected with the modem circuit, the modem circuit is connected with the main control module, and the modem circuit can convert a received signal into read data and convert the write data into a transmitting signal.
Through adopting above-mentioned technical scheme, the duplexer can realize the receiving and dispatching separation of signal, avoids signal interference, ensures the stability of system. The input amplifier can amplify the received weak signal so that the signal strength reaches the level required by processing, thereby ensuring that the system can accurately identify and read the tag information. Meanwhile, the output amplifier can increase the gain of the output signal, and improve the coverage area of the output signal of the read-write system, so that the read-write range of the system is wider, and the requirements of more application scenes can be met.
Optionally, the temperature control module comprises a temperature acquisition unit and a heating unit, wherein the temperature acquisition unit is used for acquiring and outputting the temperatures of the radio frequency module and the main control module;
the temperature control module further comprises a comparison circuit, wherein the comparison circuit is preset with a low limit value and a high limit value, the comparison circuit is connected with the temperature acquisition unit, receives the temperature output by the temperature acquisition unit, compares the temperature with the low limit value and the high limit value, outputs a heating signal when the temperature is lower than the low limit value, and stops outputting when the temperature is higher than the high limit value;
the heating unit is electrically connected with the comparison circuit, receives the temperature rising signal output by the comparison circuit, and starts heating when the heating unit receives the temperature rising signal.
By adopting the technical scheme, in environments such as cold chain logistics which need low-temperature work, the radio frequency module and the main control module can not work normally due to too low temperature, and the performance of the whole read-write system is influenced, so the temperature control module is additionally arranged, the normal work of the radio frequency module and the main control module in the low-temperature environment can be effectively protected by the arrangement of the temperature control module, and the stability and the reliability of the whole read-write system are improved. The design ensures that the read-write system has better adaptability and stability in complex environments such as cold chain logistics and the like.
Optionally, the temperature control module is divided into a plurality of heating areas according to the positions of the main control module, the plurality of antenna units and the plurality of processing units; the temperature acquisition unit comprises a plurality of temperature sensors, each heating area is distributed with a plurality of temperature sensors, wherein one temperature sensor is used for acquiring the temperature at the position with the highest temperature in the heating area; there is a temperature sensor to collect the temperature at the position of the heating area where the temperature is lowest; and each heating area is internally provided with a comparison circuit and a heating unit, the comparison circuit in each heating area is connected with all the temperature sensors in the area and receives temperatures acquired by a plurality of temperature sensors, the comparison circuit selects the maximum value as the highest temperature, selects the minimum value as the lowest temperature, compares the highest temperature with the high limit value, compares the lowest temperature with the low limit value, outputs a heating signal when the lowest temperature is lower than the low limit value, and stops outputting when the highest temperature is higher than the high limit value.
By adopting the technical scheme, the temperature control module can control the temperature of each area more accurately by dividing the heating areas, the efficiency and the accuracy of temperature regulation are improved, a plurality of temperature sensors and comparison circuits are arranged in each area, the equipment in each heating area can work at a proper temperature, and more accurate and flexible temperature control is realized. The design ensures that the read-write system can better adapt to temperature change in complex environments such as cold chain logistics and the like, and ensures the stability and reliability of the system.
Optionally, the temperature acquisition unit acquires working temperatures at the positions of the input amplifier and the output amplifier and outputs the working temperatures to the control unit; the amplifying circuit further comprises two temperature compensators, wherein one temperature compensator is connected with the input amplifier in series, the other temperature compensator is connected with the output amplifier in series, and the two temperature compensators are connected with the modem circuit; the main control module further comprises a model generation unit, wherein a database is preset in the model generation unit, and a plurality of groups of historical test data of the temperature compensator are stored in the database; the model generating unit creates a data model through model training according to historical data, and the data model represents the relationship among the temperature, the frequency, the control voltage and the gain of the temperature compensator; the control unit is pre-provided with a first curve and a second curve, wherein the first curve represents gain values of the input amplifier at different temperatures and different frequencies, and the second curve represents gain values of the output amplifier at different temperatures and different frequencies; the control unit reads the input frequency according to the read information and reads the output frequency according to the write data; the control unit is connected with the temperature acquisition unit and the temperature compensator, receives the working temperature, and adjusts the gain of the temperature compensator according to the working temperature, the input frequency, the output frequency, the first curve, the second curve and the data model, so as to ensure that the amplifying circuit can stably output at different working temperatures.
By adopting the technical scheme, the temperature compensator is used as a gain compensation amplifier, so that the gains of the input amplifier or the output amplifier at different working temperatures can be effectively compensated, and the stable output of the amplifying circuit at different working temperatures is ensured. The amplifying circuit can maintain stable gain output even when the working temperature of the read-write system changes, and the stability and reliability of the RFID read-write system are improved. Meanwhile, the sensitivity of the system to the ambient temperature is reduced, so that the RFID read-write system can work normally under wider ambient conditions.
Optionally, the control unit presets a standard temperature, the control unit combines a first curve, reads a gain corresponding to the working temperature and the input frequency as an input gain, reads the gain corresponding to the standard temperature and the input frequency as an input standard gain, makes a difference between the input gain and the input standard gain to obtain an input floating gain, calls a data model, substitutes the input floating gain, the input frequency and the working temperature into the data model, calculates to obtain a control voltage as an input control voltage, and outputs the input control voltage to a corresponding temperature compensator; the control unit reads the gain corresponding to the working temperature and the output frequency as output gain in combination with the second curve, reads the gain corresponding to the standard temperature and the output frequency as output standard gain, makes a difference between the input gain and the output standard gain to obtain output floating gain, calls a data model, substitutes the output floating gain, the output frequency and the working temperature into the data model, calculates to obtain output control voltage, and outputs the output control voltage to the corresponding temperature compensator; the temperature compensator adjusts a gain of the temperature compensator according to the received control voltage.
By adopting the technical scheme, the control unit can accurately calculate the gain change of the input amplifier or the output amplifier according to the standard gain, and control the gain of the temperature compensator to compensate the gain of the amplifying circuit, so that the gain compensation of the input amplifier and the output amplifier at different working temperatures is realized, the RFID read-write system can keep stable gain output at different working temperatures, and the stability and the reliability of the system are improved.
Optionally, the control unit presets a standard temperature and an initial control voltage, the control unit combines a first curve, reads a gain corresponding to the working temperature and the input frequency as an input gain, reads a gain corresponding to the standard temperature and the input frequency as an input standard gain, calls a data model, substitutes the initial control voltage, the input frequency and the working temperature into the data model, calculates to obtain an input initial gain, sums the input standard gain and the input initial gain, then differs from the input gain to obtain an input floating gain, substitutes the input floating gain, the input frequency and the working temperature into the data model, calculates to obtain a control voltage as an input control voltage, and outputs the input control voltage to a corresponding temperature compensator; the control unit combines a second curve, reads the gain corresponding to the working temperature and the output frequency as output gain, reads the gain corresponding to the standard temperature and the output frequency as output standard gain, calls a data model, substitutes the initial control voltage, the output frequency and the working temperature into the data model, calculates to obtain output initial gain, sums the output standard gain and the output initial gain, then makes a difference with the output gain to obtain output floating gain, substitutes the output floating gain, the output frequency and the working temperature into the data model, calculates to obtain control voltage as input control voltage, and outputs the input control voltage to a corresponding temperature compensator; the temperature compensator adjusts a gain of the temperature compensator according to the received control voltage.
By adopting the technical scheme, the initial gain of the temperature compensator and the gain of the input amplifier or the output amplifier form the total gain of the amplifying circuit together. When the gain of the input amplifier or the output amplifier is increased due to the change of the operating temperature, the temperature compensator compensates by reducing the gain thereof; when the gain of the input amplifier or the output amplifier is reduced due to the change of the working temperature, the temperature compensator compensates by increasing the gain, so that the amplifying circuit can output stably. The flexible adjustment mode of the temperature compensator also enables the system to be more suitable for complex and changeable working environments.
On the other hand, the high concurrency RFID read-write device suitable for cold chain logistics comprises the read-write system and further comprises a shell, wherein a containing cavity is formed in the shell, temperature control equipment and radio frequency equipment are arranged in the containing cavity, a temperature control module is arranged in the temperature control equipment, and a plurality of processing units and a main control module are arranged in the radio frequency equipment; a heat insulation cavity is arranged between the accommodating cavity and the outer surface of the shell, and the heat insulation cavity is arranged around the accommodating cavity.
Through adopting above-mentioned technical scheme, the thermal-insulated chamber will hold chamber and the outside separation of casing, and the setting of cavity has reduced the loss of holding intracavity temperature, has improved the thermal-insulated performance who holds the chamber, has further reduced the operating time of control by temperature change equipment, reaches the effect of energy saving.
Optionally, a plurality of independent mounting boxes are arranged in the accommodating cavity, the radio frequency equipment comprises a plurality of radio frequency processing components, each radio frequency unit corresponds to one radio frequency processing component and is arranged in the radio frequency processing component, and one radio frequency processing component is arranged in each mounting box.
Through adopting above-mentioned technical scheme, hold a plurality of radio frequency processing components respectively through setting up a plurality of independent mounting boxes, every mounting box provides independent space for radio frequency processing component, has effectively reduced electromagnetic interference and signal crosstalk's possibility, has increased the isolation effect between every radio frequency processing component, has improved read write system's stability.
In summary, the present application includes at least one of the following beneficial technical effects:
The read-write system realizes the simultaneous operation of a plurality of antenna units through a plurality of groups of radio frequency units in the radio frequency module, realizes the high-concurrency read-write operation, and improves the read-write efficiency and the stability of the system. Each antenna unit limits the receiving and transmitting of radio frequency signals with different frequencies through a frequency selection circuit, so that signal interference among different antenna units is avoided, and the stability of a system is improved;
the temperature control module can effectively protect the normal operation of the radio frequency module and the main control module in a low-temperature environment, and the stability and the reliability of the whole read-write system are improved. The design ensures that the read-write system has better adaptability and stability in complex environments such as cold chain logistics and the like;
The temperature compensator can effectively compensate the gains of the input amplifier or the output amplifier at different working temperatures, so that stable output of the amplifying circuit at different working temperatures is ensured. The amplifying circuit can maintain stable gain output even when the working temperature of the read-write system changes, and the stability and reliability of the RFID read-write system are improved.
Drawings
FIG. 1 is a system block diagram of a high concurrency RFID read-write system suitable for use in cold chain logistics in accordance with an embodiment of the present application.
Fig. 2 is a block diagram of a high concurrency RFID read-write system highlighting radio frequency module suitable for use in cold chain logistics according to an embodiment of the present application.
FIG. 3 is a block diagram of a high concurrency RFID read-write system highlighting unit adapted for use in cold chain logistics in accordance with an embodiment of the present application.
Fig. 4 is a block diagram of a high concurrency RFID read-write system highlighting master control module suitable for cold chain logistics according to an embodiment of the present application.
Fig. 5 is a block diagram of a high concurrency RFID read-write system highlighting temperature control module suitable for use in cold chain logistics according to an embodiment of the present application.
Reference numerals illustrate: 1. a radio frequency module; 11. a radio frequency unit; 12. an antenna unit; 121. a frequency selection circuit; 13. a processing unit; 131. a diplexer; 132. an amplifying circuit; 1321. an input amplifier; 1322. an output amplifier; 1323. a first temperature compensator; 1324. a second temperature compensator; 133. a modulation/demodulation circuit; 2. a main control module; 21. a communication unit; 22. a control unit; 23. a model generation unit; 3. a temperature control module; 31. a temperature acquisition unit; 311. a temperature sensor; 32. a comparison circuit; 33. and a heating unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings 1 to 5 and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Embodiment 1, the embodiment of the application discloses a high concurrency RFID read-write system suitable for cold chain logistics. Referring to fig. 1, a high concurrency RFID read-write system suitable for cold chain logistics includes a radio frequency module 1, a main control module 2 and a temperature control module 3, wherein the radio frequency module 1 is in bidirectional communication connection with the main control module 2, the radio frequency module 1 is generally used for processing transmission and reception of radio frequency signals, and is responsible for communicating with RFID tags stored on goods, reading information on the tags or writing data into the tags. The main control module 2 exchanges data and communicates with the radio frequency module 1, receives data processed by the radio frequency module 1 or transmits data to the radio frequency module 1, and performs data interaction with the outside. The temperature control module 3 is connected with the radio frequency module 1 and the main control module 2, and is used for respectively collecting the temperatures of the radio frequency module 1 and the main control module 2, and the temperature control module 3 is used for heating the radio frequency module 1 and the main control module 2 according to the collected temperatures, so that the radio frequency module 1 and the main control module 2 can work normally.
Referring to fig. 2, the radio frequency module 1 includes a plurality of sets of radio frequency units 11, each set of radio frequency units 11 is provided with a unit identifier, each set of radio frequency units 11 includes an antenna unit 12 and a processing unit 13, the antenna units 12 in each set of radio frequency units 11 are connected with the processing units 13 in the set, and each antenna unit 12 exchanges a received signal with the connected processing unit 13. The arrangement of the multiple groups of radio frequency units 11 realizes the parallel processing of multiple paths of radio frequency signal modules, and improves the read-write efficiency of the RFID read-write system under the occasion of multiple antennas.
Referring to fig. 3, each antenna unit 12 includes a frequency selection circuit 121, and the frequency selection circuit 121 is preset with different frequency intervals, and the frequency selection circuit 121 limits the antenna units 12 to transmit and receive radio frequency signals with different frequencies according to the different frequency intervals. When the antenna unit 12 receives the radio frequency signal sent by the RFID tag, the received radio frequency signal is output to the processing unit 13 as a received signal, and when the antenna unit 12 receives the transmission signal output by the processing unit 13, the transmission signal is sent to the corresponding RFID tag, and the receiving and transmitting signals between the antenna unit 12 and the RFID tag are not performed simultaneously. The frequency selection circuit 121 is arranged to stagger the frequency ranges of the working frequencies of the plurality of groups of radio frequency units 11, so that the signal isolation among the plurality of groups of radio frequency units 11 is improved, and the reliability of the read-write system is improved.
Referring to fig. 3, the processing unit 13 includes a duplexer 131, an amplifying circuit 132 and a modem circuit 133, and the amplifying circuit 132 includes an input amplifier 1321, an output amplifier 1322 and two temperature compensators, and the setting of the input amplifier 1321 and the output amplifier 1322 can increase the gain of the radio frequency input, improve the detectivity of the read-write system, and increase the output gain and improve the coverage area of the output signal of the read-write system. The temperature compensators are preferably AGC amplifiers, first and second temperature compensators 1323 and 1324, respectively, the input amplifier 1321 is connected in series with the first temperature compensator 1323 and the output amplifier 1322 is connected in series with the second temperature compensator 1324. The temperature compensator can perform gain compensation for the input amplifier 1321 and the output amplifier 1322 at different temperatures, and improve the stability of the output gain of the amplifying circuit 132.
An RX end of the duplexer 131 is connected to an input end of the input amplifier 1321, a TX end of the duplexer 131 is connected to an output end of the output amplifier 1322, and an ANT end of the duplexer 131 is connected to the antenna unit 12, so as to exchange transmission/reception signals between the duplexer 131 and the antenna unit 12. An output terminal of the input amplifier 1321 is connected to an input terminal of the first temperature compensator 1323, and an output terminal of the first temperature compensator 1323 is connected to the modem circuit 133, and amplifies the received signal and outputs the amplified signal to the modem circuit 133. An input terminal of the output amplifier 1322 is connected to an output terminal of the second temperature compensator 1324, an input terminal of the second temperature compensator 1324 is connected to the modem circuit 133, and the second temperature compensator 1324 receives the transmission signal output from the modem circuit 133 and amplifies the transmission signal. The modem circuit 133 is connected to the main control module 2, and the modem circuit 133 demodulates the received amplified received signal to obtain read data, binds the read data with the unit identifier, and outputs the read data to the main control module 2. The modem circuit 133 receives the write data output from the main control module 2, modulates the write data, converts the modulated write data into a transmit signal, and outputs the transmit signal to the second temperature compensator 1324.
Referring to fig. 2, the main control module 2 includes a communication unit 21 and a control unit 22, the communication unit 21 is used for exchanging information with the outside, the control unit 22 is connected with the communication unit 21 and the processing unit 13 in a bi-directional communication manner, the control unit 22 is in bi-directional communication with the modem circuit 133, receives the read data with the unit identifier output by the modem circuit 133, the control unit 22 processes the read data to obtain the read information, and outputs the read information with the unit identifier to the communication unit 21, and the communication unit 21 receives the read information with the unit identifier output by the control unit 22 and outputs the read information with the unit identifier to the outside. The communication unit 21 receives externally input writing information with a unit identifier, and outputs the writing information with the unit identifier to the control unit 22, the control unit 22 receives the writing information with the unit identifier output by the communication unit 21, processes the writing information to obtain writing data with the unit identifier, and outputs the writing data to the processing unit 13 of the corresponding unit according to the bound unit identifier.
Referring to fig. 4, the temperature control module 3 is divided into a plurality of heating areas according to the positions of the main control module 2, the plurality of antenna units 12, and the plurality of processing units 13. The temperature control module 3 comprises a temperature acquisition unit 31 and a plurality of heating units 33, the temperature acquisition unit 31 comprises a plurality of temperature sensors 311, and the temperature sensors 311 are used for acquiring temperatures of different positions of the radio frequency module 1 and the main control module 2. Each heating zone is distributed with a plurality of temperature sensors 311, wherein one temperature sensor 311 is used for collecting the temperature at the position with the highest temperature in the heating zone and outputting the temperature to the control unit 22, and one temperature sensor 311 is used for collecting the temperature at the position with the lowest temperature in the heating zone and outputting the temperature to the control unit 22. At least one temperature sensor 311 is distributed in the heating area corresponding to the plurality of processing units 13 near the input amplifier 1321 and the output amplifier 1322, collects the working temperatures of the input amplifier 1321 and the output amplifier 1322, and outputs the working temperatures to the control unit 22. The position with the highest temperature in the heating area and the position with the lowest temperature in the heating area are obtained through thermal analysis, thermal simulation and multiple test. The heating is more uniform due to the fact that the heating is performed in the different areas, and the problem that the temperature control effect is poor due to the fact that heat caused by the concentration of heating devices is uneven is solved. The temperature control module 3 can heat the radio frequency module 1 and the main control module 2 according to the acquired temperature, so that the read-write system can work normally in low-temperature scenes such as ocean cold-chain logistics storage, inventory, transportation and the like.
Referring to fig. 4, the temperature control module 3 further includes a plurality of comparison circuits 32, each comparison circuit 32 is preset with the same low limit value and high limit value, the low limit value is smaller than the high limit value, when the temperature is between the low limit value and the high limit value, the radio frequency module 1 and the main control module 2 can work normally, one comparison circuit 32 is distributed in each heating area, the comparison circuits 32 in the area are connected with all the temperature sensors 311 in the area, all the temperatures collected by the temperature sensors 311 are received, the maximum value in all the collected temperatures is taken as the highest temperature, and the minimum value is taken as the lowest temperature. The maximum temperature is compared with the high limit value, the minimum temperature is compared with the low limit value, the comparison circuit 32 outputs a temperature increase signal when the minimum temperature is lower than the low limit value, and the comparison circuit 32 stops outputting when the maximum temperature is higher than the high limit value.
Referring to fig. 4, a heating unit 33 is distributed in each heating area, the heating unit 33 in the area is connected with the comparison circuit 32, receives the heating signal output by the comparison circuit 32, and when the heating unit 33 receives the heating signal, the heating unit 33 starts heating. When the heating unit 33 does not receive the temperature increase signal, the heating is stopped.
Referring to fig. 5, the main control module 2 further includes a model generating unit 23, where the model generating unit 23 is preset with a database, and the database stores multiple sets of historical test data of the current temperature compensator, and in this embodiment, the first temperature compensator 1323 and the second temperature compensator 1324 adopt amplifiers of the same model, so that the historical test data of the temperature compensator is one set, and if the first temperature compensator 1323 and the second temperature compensator 1324 are two amplifiers of different models, two sets of historical data corresponding to the models of the amplifiers are required. The model generating unit 23 creates a data model through model training according to historical data, wherein the data model represents the relationship among the temperature, the frequency, the control voltage and the gain of the temperature compensator; the control unit 22 is pre-configured with a first curve and a second curve, the first curve represents the gain values of the input amplifier 1321 at different temperatures and different frequencies, the second curve represents the gain values of the output amplifier 1322 at different temperatures and different frequencies, and if the types of the input amplifier 1321 and the output amplifier 1322 are the same, only one curve is needed.
The control unit 22 reads the input frequency according to the read information and reads the output frequency according to the write data; the control unit 22 is preset with a standard temperature, the control unit 22 is connected with the temperature acquisition unit 31, the first temperature compensator 1323 and the second temperature compensator 1324, and the control unit 22 receives the working temperature and outputs the frequency according to the working temperature, the input frequency and the output frequency. When the read-write system is reading information, the control unit 22 combines the first curve, reads the gain corresponding to the operating temperature and the input frequency as an input gain, reads the gain corresponding to the standard temperature and the input frequency as an input standard gain, makes a difference between the input gain and the input standard gain to obtain an input floating gain, calls the data model, substitutes the input floating gain, the input frequency and the operating temperature into the data model, calculates to obtain a control voltage as an input control voltage, the control unit 22 outputs the input control voltage to the first temperature compensator 1323, the first temperature compensator 1323 receives the input control voltage, and adjusts the output gain of the first temperature compensator 1323 according to the control voltage. When the read-write system is writing information, the control unit 22 combines the second curve, reads the gain corresponding to the working temperature and the output frequency as the output gain, reads the gain corresponding to the standard temperature and the output frequency as the output standard gain, makes a difference between the input gain and the output standard gain to obtain the output floating gain, calls the data model, substitutes the output floating gain, the output frequency and the working temperature into the data model, calculates to obtain the output control voltage, the control unit 22 outputs the output control voltage to the second temperature compensator 1324, the second temperature compensator 1324 receives the output control voltage, and adjusts the output gain of the second temperature compensator 1324 according to the control voltage so as to ensure that the amplifying circuit 132 can stably output at different working temperatures.
The temperature compensator is used as a compensation amplifier to compensate the gains of the input amplifier 1321 and the output amplifier 1322 at different working temperatures, so as to ensure that the amplifying circuit 132 can output smoothly at different working temperatures.
Embodiment 2 is different from embodiment 1 in that, referring to fig. 5, the control unit 22 is preset with a standard temperature and an initial control voltage, which is preferably an intermediate value of a rated control voltage range of the current temperature compensator, which is available from a device data manual of the current temperature compensator. When the read-write system is reading information, the control unit 22 combines the first curve, reads the gain corresponding to the working temperature and the input frequency as the input gain, reads the gain corresponding to the standard temperature and the input frequency as the input standard gain, calls the data model, substitutes the initial control voltage, the input frequency and the working temperature into the data model, calculates to obtain the input initial gain, sums the input standard gain and the input initial gain and then differs from the input gain to obtain the input floating gain, substitutes the input floating gain, the input frequency and the working temperature into the data model, calculates to obtain the control voltage as the input control voltage, and the control unit 22 outputs the input control voltage to the first temperature compensator 1323; when the read-write system is writing information, the control unit 22 combines the second curve, reads the gain corresponding to the operating temperature and the output frequency as the output gain, reads the gain corresponding to the standard temperature and the output frequency as the output standard gain, invokes the data model, substitutes the initial control voltage, the output frequency and the operating temperature into the data model, calculates to obtain the output initial gain, sums the output standard gain and the output initial gain, then differs from the output gain to obtain the output floating gain, substitutes the output floating gain, the output frequency and the operating temperature into the data model, calculates to obtain the control voltage as the input control voltage, and the control unit 22 outputs the input control voltage to the second temperature compensator 1324.
When the control voltage of the temperature compensator is the intermediate value of the rated control voltage range, the gain of the temperature compensator and the gain of the input amplifier 1321 or the output amplifier 1322 together form the total gain of the amplifying circuit 132. Meanwhile, the temperature compensator is used as a compensation amplifier in the amplifying circuit 132, the control voltage of the temperature compensator is adjusted based on the initial control voltage, and the gains of the input amplifier 1321 or the output amplifier 1322 under different working temperatures are compensated, so as to ensure that the amplifying circuit 132 can stably output under different working temperatures. The compensation mode of the temperature compensator is that when the gain of the input amplifier 1321 or the output amplifier 1322 is increased, the temperature compensator ensures that the amplifying circuit 132 can output stably by reducing the gain, so that the temperature compensation function is more flexible and reliable.
The embodiment of the application discloses a high concurrency RFID read-write device suitable for cold chain logistics, which comprises a read-write system and further comprises a shell, wherein an accommodating cavity is formed in the shell, temperature control equipment and radio frequency equipment are arranged in the accommodating cavity, a temperature control module 3 is arranged in the temperature control equipment, a plurality of processing units 13 and a main control module 2 are arranged in the radio frequency equipment, a plurality of antenna units 12 are arranged outside the shell and connected with the plurality of processing units 13, shielding of the shell to antennas is reduced, and signal stability and reliability of the read-write device are improved.
A heat insulation cavity is arranged between the accommodating cavity and the outer surface of the shell, and the heat insulation cavity is arranged around the accommodating cavity. The heat insulation cavity is separated from the outer part of the shell, the dissipation of the temperature in the cavity is reduced by the arrangement of the cavity, the heat insulation performance of the cavity is improved, the working time of the temperature control equipment is further shortened, and the effect of saving energy is achieved.
A plurality of independent mounting boxes are arranged in the accommodating cavity, the radio frequency equipment comprises a plurality of radio frequency processing assemblies, each radio frequency unit 11 corresponds to one radio frequency processing assembly and is arranged in the radio frequency processing assembly, and one radio frequency processing assembly is arranged in each mounting box. Each radio frequency processing component is used as an independent module and is positioned in an independent installation box, and each radio frequency processing component is completely isolated, so that the isolation effect between each radio frequency processing component is further improved, and the stability of a read-write system is improved.
The implementation principle of the high concurrency RFID read-write device suitable for cold chain logistics in the embodiment of the application is as follows: the arrangement of the multiple groups of radio frequency units 11 of the read-write system enables the read-write system to simultaneously receive and transmit radio frequency signals with different frequencies according to corresponding frequency intervals, and further simultaneously performs read-write operation on multiple RFID tags, so that parallel processing of multiple radio frequency signal modules is achieved, and the read-write efficiency of the RFID read-write system is improved under the occasion of multiple antennas. Meanwhile, the temperature control equipment can heat the radio frequency equipment in a low-temperature environment, so that the normal operation of the radio frequency equipment in the low-temperature environment is ensured, the dissipation of the temperature in the accommodating cavity is reduced due to the arrangement of the heat insulation cavity, the heat insulation performance of the accommodating cavity is improved, and the working time of the temperature control equipment is further reduced. Under the condition that the radio frequency equipment normally works, the working temperature can change to change the gain of the amplifying circuit 132, so that the detection degree of the read-write system and the coverage area of the output radio frequency signal are affected, the setting of the temperature compensator can adjust the gain of the amplifying circuit 132 according to the current working temperature, the stability of the detection degree of the read-write system and the output signal power is ensured, and the stability and the reliability of the read-write device are improved.
The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (9)
1. A high concurrency RFID read-write system suitable for use in cold chain logistics, comprising:
The system comprises a radio frequency module (1) and a main control module (2), wherein the radio frequency module (1) is in bidirectional communication connection with the main control module (2);
The radio frequency module (1) comprises a plurality of groups of radio frequency units (11), each group of radio frequency units (11) is provided with a unit identifier, each group of radio frequency units (11) comprises an antenna unit (12) and a processing unit (13), and the antenna units (12) in each group of radio frequency units (11) are connected with the processing units (13) in the group to exchange signals; each antenna unit (12) comprises a frequency selection circuit (121), a plurality of frequency selection circuits (121) are preset with different frequency intervals, and the frequency selection circuits (121) limit the antenna units (12) to transmit and receive radio frequency signals with different frequencies according to the corresponding frequency intervals; the processing unit (13) receives a receiving signal output by the antenna unit (12), converts the receiving signal to obtain read data, binds the read data with a unit identifier and outputs the read data to the main control module (2), the processing unit (13) receives write data output by the main control module (2), converts the write data to obtain a transmitting signal, and outputs the transmitting signal to the antenna unit (12);
The main control module (2) comprises a communication unit (21) and a control unit (22), wherein the communication unit (21) is used for exchanging information with the outside, receiving write information with a unit identifier input by the outside and outputting the write information to the control unit (22), receiving read information with the unit identifier and outputting the read information to the outside; the control unit (22) is in bidirectional communication connection with the communication unit (21) and the processing unit (13), the control unit (22) receives the read data with the unit identifier, processes the read data to obtain read information, outputs the read information with the unit identifier to the communication unit (21), and the control unit (22) receives the write information with the unit identifier, processes the write information to obtain write data, and outputs the write data to the corresponding processing unit (13) according to the bound unit identifier.
2. A high concurrency RFID read-write system for cold chain logistics according to claim 1, wherein: the processing unit (13) comprises a duplexer (131), an amplifying circuit (132) and a modulation and demodulation circuit (133), the amplifying circuit (132) comprises an input amplifier (1321) and an output amplifier (1322), an RX end of the duplexer (131) is connected with an input end of the input amplifier (1321), a TX end of the duplexer (131) is connected with an output end of the output amplifier (1322), and an ANT end of the duplexer (131) is connected with the antenna unit (12) to exchange received signals; the output end of the input amplifier (1321) and the input end of the output amplifier (1322) are connected with the modem circuit (133), the modem circuit (133) is connected with the main control module (2), and the modem circuit (133) can convert a received signal into read data and convert write data into a transmitting signal.
3. A high concurrency RFID read-write system for cold chain logistics according to claim 2, wherein: the temperature control device comprises a main control module (2) and a temperature control module (3), wherein the main control module (2) is used for controlling the temperature of the radio frequency module (1) and the temperature of the temperature control module (3);
The temperature control module (3) further comprises a comparison circuit (32), the comparison circuit (32) is preset with a low limit value and a high limit value, the comparison circuit (32) is connected with the temperature acquisition unit (31), the temperature output by the temperature acquisition unit (31) is received, the temperature is compared with the low limit value and the high limit value, when the temperature is lower than the low limit value, the comparison circuit (32) outputs a heating signal, and when the temperature is higher than the high limit value, the comparison circuit (32) stops outputting;
The heating unit (33) is electrically connected with the comparison circuit (32), receives a heating signal output by the comparison circuit (32), and when the heating unit (33) receives the heating signal, the heating unit (33) starts heating.
4. A high concurrency RFID read-write system for cold chain logistics according to claim 3, wherein: the temperature control module (3) is divided into a plurality of heating areas according to the positions of the main control module (2), the plurality of antenna units (12) and the plurality of processing units (13); the temperature acquisition unit (31) comprises a plurality of temperature sensors (311), each heating area is distributed with the plurality of temperature sensors (311), wherein one temperature sensor (311) acquires the temperature at the position with the highest temperature in the heating area; a temperature sensor (311) is arranged to detect the temperature at the lowest temperature location in the heating zone; and each heating area is internally provided with a comparison circuit (32) and a heating unit (33), the comparison circuit (32) in each heating area is connected with all the temperature sensors (311) in the area, the temperatures collected by the temperature sensors (311) are received, the comparison circuit (32) selects the maximum value as the highest temperature, selects the minimum value as the lowest temperature, compares the highest temperature with the high limit value, compares the lowest temperature with the low limit value, and outputs a heating signal when the lowest temperature is lower than the low limit value, and the comparison circuit (32) stops outputting when the highest temperature is higher than the high limit value.
5. A high concurrency RFID read-write system for cold chain logistics according to claim 3, wherein: the temperature acquisition unit (31) acquires the working temperatures of the input amplifier (1321) and the output amplifier (1322) and outputs the working temperatures to the control unit (22); the amplifying circuit (132) further comprises two temperature compensators, wherein one temperature compensator is connected in series with the input amplifier (1321), the other temperature compensator is connected in series with the output amplifier (1322), and the two temperature compensators are connected with the modem circuit (133); the main control module (2) further comprises a model generation unit (23), wherein a database is preset in the model generation unit (23), and a plurality of groups of historical test data of the temperature compensator are stored in the database; the model generating unit (23) creates a data model through model training according to historical data, and the data model represents the relationship among the temperature, the frequency, the control voltage and the gain of the temperature compensator; the control unit (22) is preset with a first curve and a second curve, wherein the first curve represents gain values of the input amplifier (1321) at different temperatures and different frequencies, and the second curve represents gain values of the output amplifier (1322) at different temperatures and different frequencies; the control unit (22) reads the input frequency according to the read information and reads the output frequency according to the write data; the control unit (22) is connected with the temperature acquisition unit (31) and the temperature compensator, the control unit (22) receives the working temperature, and the gain of the temperature compensator is adjusted according to the working temperature, the input frequency, the output frequency, the first curve, the second curve and the data model, so that the amplification circuit (132) can stably output at different working temperatures.
6. A high concurrency RFID read-write system for cold chain logistics according to claim 5, wherein: the control unit (22) is preset with a standard temperature, the control unit (22) is combined with a first curve, gains corresponding to the working temperature and the input frequency are read to be used as input gains, gains corresponding to the standard temperature and the input frequency are read to be used as input standard gains, the input gains and the input standard gains are subjected to difference to obtain input floating gains, a data model is called, the input floating gains, the input frequency and the working temperature are substituted into the data model, a control voltage is obtained through calculation to be used as an input control voltage, and the control unit (22) outputs the input control voltage to a corresponding temperature compensator; the control unit (22) reads the gain corresponding to the working temperature and the output frequency as output gain in combination with the second curve, reads the gain corresponding to the standard temperature and the output frequency as output standard gain, obtains output floating gain by making difference between the input gain and the output standard gain, calls a data model, substitutes the output floating gain, the output frequency and the working temperature into the data model, calculates to obtain output control voltage, and the control unit (22) outputs the output control voltage to the corresponding temperature compensator; the temperature compensator adjusts the gain according to the received control voltage.
7. A high concurrency RFID read-write system for cold chain logistics according to claim 5, wherein: the control unit (22) is preset with a standard temperature and an initial control voltage, the control unit (22) is combined with a first curve, gains corresponding to the working temperature and the input frequency are read to be used as input gains, gains corresponding to the standard temperature and the input frequency are read to be used as input standard gains, a data model is called, the initial control voltage, the input frequency and the working temperature are substituted into the data model, the input initial gain is obtained through calculation, the input standard gain and the input initial gain are summed and then are subjected to difference with the input gain to obtain an input floating gain, the input frequency and the working temperature are substituted into the data model, the control voltage is obtained through calculation to be used as the input control voltage, and the control unit (22) outputs the input control voltage to a corresponding temperature compensator; the control unit (22) reads the gain corresponding to the working temperature and the output frequency as output gain in combination with the second curve, reads the gain corresponding to the standard temperature and the output frequency as output standard gain, calls the data model, substitutes the initial control voltage, the output frequency and the working temperature into the data model, calculates to obtain output initial gain, sums the output standard gain and the output initial gain and then differs from the output gain to obtain output floating gain, substitutes the output floating gain, the output frequency and the working temperature into the data model, calculates to obtain control voltage as input control voltage, and the control unit (22) outputs the input control voltage to the corresponding temperature compensator; the temperature compensator adjusts the gain according to the received control voltage.
8. High concurrency RFID read-write equipment suitable for cold chain commodity circulation, its characterized in that: the high concurrency RFID read-write system suitable for cold chain logistics comprises any one of claims 1-7, and further comprises a shell, wherein a containing cavity is formed in the shell, temperature control equipment and radio frequency equipment are arranged in the containing cavity, a temperature control module (3) is arranged in the temperature control equipment, and a plurality of processing units (13) and a main control module (2) are arranged in the radio frequency equipment; a heat insulation cavity is arranged between the accommodating cavity and the outer surface of the shell, and the heat insulation cavity is arranged around the accommodating cavity.
9. A high concurrency RFID read-write device for cold chain logistics according to claim 8, wherein: the radio frequency equipment comprises a plurality of radio frequency processing components, each radio frequency unit (11) corresponds to one radio frequency processing component and is arranged in the radio frequency processing component, and one radio frequency processing component is arranged in each mounting box.
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| CN202410486706.7A CN118095325A (en) | 2024-04-23 | 2024-04-23 | High concurrency RFID read-write system and device suitable for cold chain logistics |
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| CN202410486706.7A CN118095325A (en) | 2024-04-23 | 2024-04-23 | High concurrency RFID read-write system and device suitable for cold chain logistics |
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