CN115276681B - RFID reader-writer system, transmitting power closed-loop control method and main controller - Google Patents
RFID reader-writer system, transmitting power closed-loop control method and main controller Download PDFInfo
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- CN115276681B CN115276681B CN202210892997.0A CN202210892997A CN115276681B CN 115276681 B CN115276681 B CN 115276681B CN 202210892997 A CN202210892997 A CN 202210892997A CN 115276681 B CN115276681 B CN 115276681B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application provides an RFID reader-writer system, a transmitting power closed-loop control method and a main controller, wherein the system comprises a transmitting link power driving circuit and a radio frequency power calibration circuit, wherein the transmitting link power driving circuit comprises a digital baseband and a gain register thereof, a fundamental frequency DAC, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof, a filter and a final-stage adjustable gain power amplifier which are sequentially connected, and the radio frequency power calibration circuit comprises a directional coupler, a power detector, an analog-to-digital converter and the main controller.
Description
Technical Field
The application relates to the technical field of radio frequency, in particular to an RFID reader-writer system, a transmitting power closed-loop control method and a main controller.
Background
The ultrahigh frequency radio frequency identification communication system consists of an RFID reader-writer and an RFID tag. The RFID reader-writer is an active system, can be directly externally connected with a power supply for power supply, and the tag is a passive system and cannot be directly externally connected with the power supply for power supply. The RFID reader-writer emits electromagnetic waves to the space through an antenna, and the RFID tag receives the space electromagnetic waves through the antenna and converts the space electromagnetic waves into electric energy to supply power for the RFID reader-writer. In the practical application scene, the distance between the RFID tag and the RFID reader-writer can influence the quality of communication. For example, when the distance between the two is far, the electromagnetic wave space is greatly attenuated, so that the RFID reader-writer is required to emit high-power electromagnetic waves so as to activate the tag and ensure normal communication of the two; when the distance between the two is relatively short, the electromagnetic wave space is reduced, so that the RFID reader-writer is required to emit low-power electromagnetic waves, only the close-range tag is activated, the activation of the long-range tag is avoided, and meanwhile, the power consumption of a reader-writer system can be reduced. The output power of the RFID reader-writer is required to be adjustable so as to meet the requirements of communication application scenes of different distances.
Currently, an RFID reader system mainly comprises a baseband DAC, a Mixer (Mixer), an on-chip power amplifier, an off-chip power amplifier, a directional coupler, a power detector, an analog-to-digital converter and a main controller. The gain of the mixer and the gain of the on-chip power amplifier can be regulated through the registers, but the range of the gain regulation of the two registers is limited, so that the current industry reader-writer system can only realize the power regulation range of 15dBm-33dBm generally, and the power can not be regulated in a large dynamic range.
Disclosure of Invention
The present application aims to solve at least one of the above technical drawbacks, and in particular, the technical drawbacks of the prior art that the range of gain adjustment by only two registers is limited and the power cannot be adjusted in a large dynamic range.
The application provides an RFID reader-writer system, which comprises: a transmit link power driving circuit and a radio frequency power calibration circuit;
the transmitting link power driving circuit comprises a digital baseband and a gain register thereof, a baseband DAC, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof, a filter and a final-stage adjustable gain power amplifier which are connected in sequence;
the radio frequency power calibration circuit comprises a directional coupler, a power detector, an analog-to-digital converter and a main controller;
one end of the directional coupler is connected with the final-stage adjustable gain power amplifier, and the other end of the directional coupler is connected with the power detector and is used for coupling the output power of the final-stage adjustable gain power amplifier to the power detector;
one end of the power detector is connected with the directional coupler, and the other end of the power detector is connected with the input end of the main controller through the analog-to-digital converter and is used for detecting the power coupled by the directional coupler, converting the detected power into output voltage through the analog-to-digital converter and then transmitting the output voltage to the main controller;
The output end of the main controller is respectively connected with the digital baseband and a gain register thereof, the mixer and a gain register thereof, the driving power amplifier and a gain register thereof and the final-stage adjustable gain power amplifier, and is used for performing closed-loop control on the gain of each gain driving unit in the transmitting link power driving circuit according to the output voltage so as to ensure that the transmitting power of the transmitting link power driving circuit meets the requirements of different communication scenes.
Optionally, the system further comprises a temperature sensor;
one end of the temperature sensor is connected with the power detector, the other end of the temperature sensor is connected with the main controller, and the temperature sensor is used for detecting the real-time temperature of the power detector and sending the detected real-time temperature to the main controller, so that the main controller carries out closed-loop control on the actual transmitting power when the gains of all gain driving units in the transmitting link power driving circuit are regulated according to the real-time temperature, and self-adaptive compensation is carried out.
The application also provides a transmitting power closed-loop control method which is applied to the main controller of the RFID reader-writer system in any one of the embodiments, and the method comprises the following steps:
Determining target transmitting power of a transmitting link power driving circuit, and acquiring a first gain configuration table between a preconfigured transmitting link gain and transmitting power;
configuring the gain of each gain driving unit in the transmission link power driving circuit based on the target transmission power and the first gain configuration table;
acquiring the actual transmitting power of the transmitting link power driving circuit after gain configuration;
comparing the actual transmitting power with the target transmitting power, and determining whether a power error between the actual transmitting power and the target transmitting power exceeds a preset error threshold;
if yes, reconfiguring the gain of each gain driving unit in the transmission link power driving circuit according to the power error, and returning to the step of acquiring the actual transmission power of the transmission link power driving circuit after configuring the gain until the power error between the actual transmission power and the target transmission power does not exceed the preset error threshold;
if not, the closed loop control link is exited.
Optionally, each gain driving unit in the transmitting link power driving circuit comprises a digital baseband and a gain register thereof, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof and a final-stage adjustable gain power amplifier;
The configuring the gain of each gain driving unit in the transmission link power driving circuit based on the target transmission power and the first gain configuration table includes:
determining a target transmitting link gain when the transmitting link power driving circuit reaches the target transmitting power according to the target transmitting power and the first gain configuration table;
acquiring a second gain configuration table between the gain of the transmitting link and the gain of each gain driving unit;
and configuring the gains of the digital baseband and the gain register thereof, the mixer and the gain register thereof, the driving power amplifier and the gain register thereof and the final-stage adjustable gain power amplifier according to the target transmitting link gain and the second gain configuration table.
Optionally, the reconfiguring the gain of each gain driving unit in the transmitting link power driving circuit according to the power error includes:
re-determining a target transmitting link gain when the transmitting link power driving circuit reaches the target transmitting power according to the power error;
and according to the redetermined target transmitting link gain and the second gain configuration table, the gains of the digital baseband and the gain register thereof, the mixer and the gain register thereof, the driving power amplifier and the gain register thereof and the final-stage adjustable gain power amplifier are reconfigured.
Optionally, the acquiring the actual transmission power of the transmission link power driving circuit after the gain configuration includes:
obtaining output voltage obtained after the detection power of the power detector is converted and input by the analog-to-digital converter;
converting the output voltage into the transmission power according to a target fitting formula between the preset transmission power and the output voltage, and taking the transmission power obtained by conversion as the actual transmission power of the transmission link power driving circuit after gain configuration;
the target fitting formula is a fitting formula set by the power detector in a normal temperature state.
Optionally, the configuration process of the target fitting formula includes:
determining an initial fitting formula according to the circuit loss of the radio frequency power calibration circuit and the type of the power detector;
selecting configuration relations between a plurality of groups of transmission link gains and transmission powers from the first gain configuration table at will;
and calibrating parameters in the initial fitting formula according to configuration relations between the gains and the transmitting powers of the transmitting links of each group to obtain a target fitting formula.
Optionally, the method further comprises:
determining a first gain configuration table between the transmission link gains and the transmission power at different working frequencies;
Returning to the first gain configuration table under each working frequency, and executing the step of arbitrarily selecting configuration relations between a plurality of groups of transmission link gains and transmission powers from the first gain configuration table until a target fitting formula under each working frequency is obtained;
the target fitting formula at each working frequency is used for converting the output voltage at the corresponding working frequency into the transmitting power at the corresponding working frequency.
Optionally, the method further comprises:
determining a real-time temperature of the power detector;
determining a power compensation value under the temperature difference according to the temperature difference between the real-time temperature of the power detector and the temperature of the power detector in the normal temperature state;
and carrying out self-adaptive compensation on the actual transmitting power of the transmitting link power driving circuit after the gain configuration according to the power compensation value.
The application also provides a master controller configured to perform the steps of the transmit power closed loop control method according to any of the above embodiments.
From the above technical solutions, the embodiment of the present application has the following advantages:
the application provides an RFID reader-writer system, a transmitting power closed-loop control method and a main controller, wherein the system comprises a transmitting link power driving circuit and a radio frequency power calibration circuit, the transmitting link power driving circuit comprises a digital baseband and a gain register thereof, a baseband DAC, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof, a filter and a final-stage adjustable gain power amplifier which are sequentially connected, the radio frequency power calibration circuit comprises a directional coupler, a power detector, an analog-to-digital converter and a main controller, the directional coupler couples the output power of the final-stage adjustable gain power amplifier to the power detector, the power detector detects the power coupled by the directional coupler, the detected power is converted into output voltage by the analog-to-digital converter and then is sent to the main controller, and the main controller performs closed-loop control on the gain of the digital baseband and the gain register thereof, the gain of the driving power amplifier and the gain register thereof and the gain of the final-stage adjustable gain power amplifier according to the output voltage, so that the transmitting power of the transmitting link power driving circuit meets different communication requirements, and the transmitting power of the transmitting link power driving circuit is further increased in the range of the digital baseband and the gain register thereof.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an RFID reader system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a main controller for performing closed-loop control on gains of gain driving units in a power driving circuit of a transmitting link according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a method for controlling a transmit power in a closed loop according to an embodiment of the present application;
fig. 4 is a display diagram of a first gain configuration table between a transmission link gain and a transmission power according to an embodiment of the present application;
fig. 5 is a diagram showing a second gain configuration between the gain of the transmitting link and the gain of each gain driving unit according to the embodiment of the present application;
FIG. 6 is a schematic diagram of a calibration circuit according to an embodiment of the present application;
Fig. 7 is a schematic structural diagram of an adaptive compensation circuit according to an embodiment of the present application;
fig. 8 is a schematic diagram of actual transmission power after adaptive compensation at different temperatures according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Currently, an RFID reader system mainly comprises a baseband DAC, a Mixer (Mixer), an on-chip power amplifier, an off-chip power amplifier, a directional coupler, a power detector, an analog-to-digital converter and a main controller. The gain of the mixer and the gain of the on-chip power amplifier can be regulated through the registers, but the range of the gain regulation of the two registers is limited, so that the current industry reader-writer system can only realize the power regulation range of 15dBm-33dBm generally, and the power can not be regulated in a large dynamic range.
Based on the above, the application provides the following technical scheme, and the specific scheme is as follows:
in one embodiment, the present application provides an RFID reader system, the system comprising: a transmit chain power drive circuit and a radio frequency power calibration circuit.
It can be understood that the transmitting link power driving circuit refers to a link of an RFID reader system, which is formed by a plurality of gain driving units, a baseband DAC and a filter and transmits electromagnetic waves with certain power, and the radio frequency power calibration circuit refers to a circuit for detecting and performing closed-loop control adjustment on the transmitting power of the transmitting link power driving circuit in the RFID reader system.
The transmitting link power driving circuit can comprise a digital baseband and a gain register thereof, a baseband DAC, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof, a filter and a final-stage adjustable gain power amplifier which are connected in sequence.
It should be noted that, the transmitting link power driving circuit in the present application includes a plurality of gain driving units, which are respectively a digital baseband and a gain register thereof, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof, and a final-stage adjustable gain power amplifier, each gain driving unit adjusts a respective gain through the gain register thereof or the power amplifier itself, so that the power of the final transmitting link power driving circuit when transmitting electromagnetic waves can meet the requirements of different application scenarios.
Further, the gain herein refers to the amplification factor, and the gain register refers to a register capable of amplifying a signal. For example, the digital baseband and its gain register in the present application refer to the electronic components that amplify the digital baseband signal before it is modulated onto the carrier signal; after the baseband DAC converts the amplified digital baseband signal into a radio frequency signal, the mixer and the gain register multiply the radio frequency signal sent by the baseband DAC with a local oscillation signal and then amplify the radio frequency signal; the electronic component can drive the power amplifier and the gain register thereof to drive the output power of the mixer and the gain register thereof to gain; the final stage gain-adjustable power amplifier can be used as an electronic component for amplifying the output power of the driving power amplifier and the gain register thereof again.
The radio frequency power calibration circuit may include a directional coupler, a power detector, an analog-to-digital converter, and a main controller.
One end of the directional coupler is connected with the final-stage adjustable gain power amplifier, and the other end of the directional coupler is connected with the power detector and is used for coupling the output power of the final-stage adjustable gain power amplifier to the power detector.
One end of the power detector is connected with the directional coupler, and the other end of the power detector is connected with the input end of the main controller through the analog-to-digital converter and is used for detecting the power coupled by the directional coupler, converting the detected power into output voltage through the analog-to-digital converter and then transmitting the output voltage to the main controller.
The output end of the main controller is respectively connected with the digital baseband and a gain register thereof, the mixer and a gain register thereof, the driving power amplifier and a gain register thereof and the final-stage adjustable gain power amplifier, and is used for performing closed-loop control on the gain of each gain driving unit in the transmitting link power driving circuit according to the output voltage so as to ensure that the transmitting power of the transmitting link power driving circuit meets the requirements of different communication scenes.
Schematically, as shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an RFID reader system provided by an embodiment of the present application, and fig. 2 is a schematic structural diagram of a main controller provided by an embodiment of the present application for performing closed-loop control on gains of gain driving units in a transmission link power driving circuit; as can be seen from fig. 1 and fig. 2, in the present application, the main controller collects the output voltage corresponding to the detection power of the power detector through the analog-to-digital converter, and performs closed-loop control on the gain of each gain driving unit in the transmission link power driving circuit according to the output voltage, and when there are multiple gain driving units in the transmission link power driving circuit, the gain in each gain driving unit can be adjusted, so that the overall gain of the transmission link power driving circuit can be improved, thereby expanding the adjustable range of the transmission power of the transmission link power driving circuit, and further meeting the requirements of different communication scenarios.
In addition, the main controller in the present application refers to an instruction controller that plays a main role in a given time interval in a computer having a plurality of instruction controllers. As can be seen from fig. 1 and 2, the main controller in the present application can be replaced by an MCU (micro control unit), also called a single-chip microcomputer (Single Chip Microcomputer) or a single-chip microcomputer. Generally, the data bit number processed by the MCU according to the basic operation can be divided into 1-bit, 4-bit, 8-bit, 16-bit, 32-bit and even 64-bit singlechips, and 8-bit, 16-bit and 32-bit singlechips are used in common times; the memory types can be divided into a non-chip ROM type and a tape-chip ROM type, and the application can be selected according to actual situations without limitation.
In the above embodiment, the RFID reader/writer system includes a transmitting link power driving circuit and a radio frequency power calibration circuit, where the transmitting link power driving circuit includes a digital baseband and a gain register thereof, a baseband DAC, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof, a filter and a final-stage adjustable gain power amplifier that are sequentially connected, the radio frequency power calibration circuit includes a directional coupler, a power detector, an analog-to-digital converter and a main controller, the directional coupler couples the output power of the final-stage adjustable gain power amplifier to the power detector, the power detector detects the power coupled by the directional coupler, and converts the detected power into an output voltage through the analog-to-digital converter and sends the output voltage to the main controller, and the main controller performs closed-loop control on the gain of the digital baseband and the gain register thereof, the gain of the mixer and the gain register thereof, the gain of the driving power amplifier and the gain register thereof, so that the transmitting power of the transmitting link power driving circuit meets the requirements of different communication scenarios.
In one embodiment, the system may further comprise a temperature sensor; one end of the temperature sensor is connected with the power detector, the other end of the temperature sensor is connected with the main controller, and the temperature sensor is used for detecting the real-time temperature of the power detector and sending the detected real-time temperature to the main controller, so that the main controller carries out closed-loop control on the actual transmitting power when the gains of all gain driving units in the transmitting link power driving circuit are regulated according to the real-time temperature, and self-adaptive compensation is carried out.
In this embodiment, the RFID reader system may further include a temperature sensor, where the temperature sensor may be disposed between the power detector and the main controller, and is configured to detect a temperature of the power detector in real time, and send the detected real-time temperature to the main controller, so that the main controller may perform adaptive compensation on an actual transmitting power when performing closed-loop control adjustment on gains of each gain driving unit in the transmitting link power driving circuit according to the real-time temperature, thereby effectively reducing occurrence of poor accuracy of adjustment of output power of the reader due to a change of a working environment temperature of the power detector.
It can be understood that due to the influence of the temperature factor of the working environment, the power detected by the power detector at different temperatures has a certain deviation, so that the output voltage input to the main controller also has a certain deviation, and under the influence of the deviation, the adjustment accuracy of the output power of the final RFID reader-writer system is easy to be poor. Therefore, in order to improve the adjustment precision, when the power detector works, the temperature sensor is used for detecting the real-time temperature of the power detector, and the main controller is used for adaptively compensating the actual transmitting power of the transmitting link power driving circuit according to the real-time temperature, so that the deviation is eliminated to a certain extent.
In one embodiment, as shown in fig. 3, fig. 3 is a schematic flow chart of a method for controlling a transmit power in a closed loop according to an embodiment of the present application; the application also provides a transmitting power closed-loop control method which is applied to the main controller of the RFID reader-writer system in any one of the embodiments, and the method can comprise the following steps:
s110: the method comprises the steps of determining target transmitting power of a transmitting link power driving circuit and acquiring a first gain configuration table between a preconfigured transmitting link gain and the transmitting power.
In this step, when the main controller performs closed-loop control on the transmitting power of the transmitting link power driving circuit, the main controller may determine the target transmitting power of the transmitting link power driving circuit, where the target transmitting power refers to the transmitting power when the transmitting link power driving circuit in the RFID reader system transmits electromagnetic waves when the RFID reader system communicates with an RFID tag with a certain distance.
It can be appreciated that, since the distance between the RFID reader system and the RFID tag is related to the application scenario, the distance between the RFID reader system and the RFID tag is different in different application scenarios. When the distance between the two is far, the electromagnetic wave space is greatly attenuated, so that the RFID reader-writer system is required to emit high-power electromagnetic waves, and the tags can be activated, and normal communication of the two is ensured; when the distance between the two is relatively short, the electromagnetic wave space is reduced, so that the RFID reader-writer system is required to emit low-power electromagnetic waves, only the close-range tag is activated, the activation of the long-range tag is avoided, and meanwhile, the power consumption of the RFID reader-writer system can be reduced. Therefore, the target transmitting power in the application changes along with the transformation of the application scene, and when the target transmitting power changes, the gains of all gain driving units in the transmitting link power driving circuit can be controlled by the transmitting power closed-loop control method so as to achieve the corresponding transmitting power.
Furthermore, when the transmitting power of the transmitting link power driving circuit is subjected to closed-loop control, the application can also obtain the first gain configuration table between the preconfigured transmitting link gain and the transmitting power, wherein the first gain configuration table records the corresponding relation between a plurality of groups of transmitting link gains and the transmitting power, and after the target transmitting power is determined, the transmitting link gain of the transmitting link power driving circuit corresponding to the current target transmitting power can be determined through the first gain configuration table, so that the gains of all the gain driving units in the transmitting link power driving circuit can be controlled through the transmitting link gain.
S120: and configuring the gain of each gain driving unit in the transmission link power driving circuit based on the target transmission power and the first gain configuration table.
S130: and acquiring the actual transmitting power of the transmitting link power driving circuit after the gain is configured.
In the above steps, after determining the target transmit power of the transmit chain power driving circuit and obtaining the first gain configuration table between the preconfigured transmit chain gain and the transmit power through S110, the present application may configure the gain of each gain driving unit in the transmit chain power driving circuit based on the target transmit power and the first gain configuration table, so as to obtain the actual transmit power of the transmit chain power driving circuit after configuring the gain.
S140: comparing the actual transmitting power with the target transmitting power, and determining whether the power error between the actual transmitting power and the target transmitting power exceeds a preset error threshold; if yes, executing S150; if not, S160 is performed.
In this step, after determining the actual transmitting power of the transmitting link power driving circuit, the present application can compare the actual transmitting power with the target transmitting power, determine whether the power error between the actual transmitting power and the target transmitting power exceeds the preset error threshold, and make different processing modes respectively under the condition that the power error exceeds the preset error threshold or does not exceed the preset error threshold.
The preset error threshold value of the application can be the error between the actual transmitting power and the target transmitting power which can meet the requirements of different application scenes and are obtained after multiple experiments, and if the actual transmitting power is within the preset error threshold value range, the actual transmitting power is indicated to meet the requirements of the current application scene, and if the actual transmitting power is not within the preset error threshold value range, the actual transmitting power is indicated to not meet the requirements of the current application scene, so that the actual transmitting power needs to be adjusted so as to meet the requirements of the current application scene.
It can be understood that, in the present application, the first gain configuration table provides a correspondence between multiple sets of transmission link gains and transmission powers, and after determining the target transmission power, the transmission link gain of the transmission link power driving circuit corresponding to the current target transmission power can be determined by the first gain configuration table, so that the gain of each gain driving unit in the transmission link power driving circuit is controlled by the transmission link gain. However, in the control process, the control precision of each gain driving unit is inevitably deviated to a certain extent, so that a certain error exists between the actual transmission power of the transmission link power driving circuit after the gain is configured and the target transmission power. In order to eliminate the error, the application can compare the actual transmitting power with the target transmitting power, judge whether the power error between the actual transmitting power and the target transmitting power exceeds the preset error threshold value, and correspondingly control the condition of exceeding or not exceeding, thereby leading the power output by the final transmitting link power driving circuit to be more approximate to the target transmitting power, ensuring the normal communication between the RFID reader-writer system and the RFID tag and reducing the power consumption of the RFID reader-writer system.
S150: and reconfiguring the gain of each gain driving unit in the transmission link power driving circuit according to the power error, and returning to S130-S140 until the power error between the actual transmission power and the target transmission power does not exceed a preset error threshold.
S160: and exiting the closed loop control link.
In the above steps, when the power error between the actual transmission power and the target transmission power exceeds the preset error threshold, the gain of each gain driving unit in the transmission link power driving circuit may be reconfigured according to the power error, the actual transmission power of the transmission link power driving circuit after the gain is configured is obtained, the actual transmission power is compared with the target transmission power, it is determined whether the power error between the actual transmission power and the target transmission power exceeds the preset error threshold, if so, the gain of each gain driving unit in the transmission link power driving circuit is reconfigured according to the power error until the power error between the actual transmission power and the target transmission power does not exceed the preset error threshold; when the power error between the actual transmitting power and the target transmitting power does not exceed the preset error threshold, the actual transmitting power is indicated to meet the requirement of the current application scene, the closed-loop control link can be directly exited, and the transmitting link power driving circuit can directly output corresponding electromagnetic waves according to the actual transmitting power.
In one embodiment, each gain driving unit in the transmission link power driving circuit may include a digital baseband and its gain register, a mixer and its gain register, a driving power amplifier and its gain register, and a final stage adjustable gain power amplifier.
The configuring the gain of each gain driving unit in the transmission link power driving circuit based on the target transmission power and the first gain configuration table in S120 may include:
s121: and determining a target transmitting link gain when the transmitting link power driving circuit reaches the target transmitting power according to the target transmitting power and the first gain configuration table.
S122: a second gain configuration table between the transmit link gains and the gains of the respective gain driving units is obtained.
S123: and configuring the gains of the digital baseband and the gain register thereof, the mixer and the gain register thereof, the driving power amplifier and the gain register thereof and the final-stage adjustable gain power amplifier according to the target transmitting link gain and the second gain configuration table.
In this embodiment, when configuring the gain of each gain driving unit in the transmission link power driving circuit, the target transmission link gain when the transmission link power driving circuit reaches the target transmission power may be determined according to the target transmission power and the first gain configuration table, and then, the present application may acquire a second gain configuration table between the transmission link gain and the gain of each gain driving unit, and find the gain of each gain driving unit corresponding to the target transmission link gain according to the second gain configuration table, so as to configure the gain of each gain driving unit.
Fig. 4 is a display diagram of a first gain configuration table between a transmission link gain and a transmission power provided by an embodiment of the present application, and fig. 5 is a display diagram of a second gain configuration between a transmission link gain and a gain of each gain driving unit provided by an embodiment of the present application; in fig. 4 and 5, dbb_gain represents a digital baseband and a Gain register thereof, modulator_gain represents a mixer and a Gain register thereof, driver pa_gain represents a driving power amplifier and a Gain register thereof, pa_gain represents a final-stage adjustable Gain power amplifier, and gain_index in fig. 5 represents a transmission link Gain. As can be seen from fig. 4, on the transmit link of the RFID reader system, the Gain control of each unit of the digital baseband and its Gain register (dbb_gain), the mixer and its Gain register (modulator_gain), the driving power amplifier and its Gain register (Driver pa_gain) and the final adjustable Gain power amplifier (pa_gain) can be realized by the main controller, the transmit power output range is-3 dBm-33dBm, and the adjustment accuracy is < 1dB; as can be seen from fig. 5, the Gain gain_index of the transmitting link in the present application is adjusted up or down, corresponding to 1 or more values of dbb_ Gain, modulator _gain, driver pa_gain, pa_gain. Therefore, after determining the transmission link gain corresponding to the target transmission power, the gain of each gain driving unit can be determined through the transmission link gain, so as to realize the configuration of the gain of each gain driving unit in the transmission link power driving circuit.
In one embodiment, reconfiguring the gain of each gain driving unit in the transmit chain power driving circuit according to the power error in S150 may include:
s151: and re-determining a target transmitting link gain when the transmitting link power driving circuit reaches the target transmitting power according to the power error.
S152: and according to the redetermined target transmitting link gain and the second gain configuration table, the gains of the digital baseband and the gain register thereof, the mixer and the gain register thereof, the driving power amplifier and the gain register thereof and the final-stage adjustable gain power amplifier are reconfigured.
In this embodiment, when the gain of each gain driving unit in the transmission link power driving circuit is reconfigured, the present application may redetermine the target transmission link gain when the transmission link power driving circuit reaches the target transmission power according to the power error, and then reconfigure the gain of each gain driving unit in the transmission link power driving circuit according to the redetermined target transmission link gain and the second gain configuration table.
For example, the present application may redetermine the target transmit link gain based on the magnitude of the power error. For example, when the power error is negative, the target transmit link gain may be adjusted upward, and the gain of each gain driving unit corresponding to the adjusted target transmit link gain may be determined; when the power error is positive, the target transmitting link gain is reduced, and the gain of each gain driving unit corresponding to the reduced target transmitting link gain is determined, so that the gain of each gain driving unit in the transmitting link power driving circuit is reconfigured. Of course, the present application may also redetermine the target transmit link gain in other manners, which will not be described herein.
In one embodiment, the obtaining the actual transmit power of the transmit link power driving circuit after the gain is configured in S130 may include:
s131: and obtaining an output voltage which is input by the analog-to-digital converter and is obtained after the detection power of the power detector is converted.
S132: converting the output voltage into the transmission power according to a target fitting formula between the preset transmission power and the output voltage, and taking the transmission power obtained by conversion as the actual transmission power of the transmission link power driving circuit after gain configuration; the target fitting formula is a fitting formula set by the power detector in a normal temperature state.
In this embodiment, when the actual transmission power of the transmission link power driving circuit after the gain is configured is acquired, the output voltage obtained after the detection power of the power detector is converted and input by the analog-to-digital converter may be acquired first.
It can be understood that the application realizes the detection and calibration of the transmitting power through the transmitting link power driving circuit and the radio frequency power calibration circuit, wherein the radio frequency power calibration circuit can comprise a directional coupler, a power detector, an analog-to-digital converter and a main controller; the main controller collects output voltage corresponding to the detection power of the power detector through the analog-to-digital converter, and performs closed-loop control on the gain of each gain driving unit in the transmission link power driving circuit according to the output voltage, so that the adjustable range of the transmission power of the transmission link power driving circuit is enlarged, and the requirements of different communication scenes are further met.
When the main controller performs closed-loop control on the gain of each gain driving unit in the transmission link power driving circuit according to the output voltage, the output voltage can be converted into the transmission power according to a target fitting formula between the pre-configured transmission power and the output voltage, the converted transmission power is used as the actual transmission power of the transmission link power driving circuit after the gain is configured, and further the gain of each gain driving unit in the transmission link power driving circuit is subjected to closed-loop control according to the power error between the actual transmission power and the target transmission power.
The target fitting formula is a fitting formula set by the power detector in a normal temperature state, the actual output power of the RFID reader-writer system can be calculated through the fitting formula, and whether the gain of each gain driving unit in the transmitting link power driving circuit is adjusted or not is further determined according to the actual output power, so that the finally output power meets the requirement of the current application scene.
In one embodiment, the configuration process of the target fitting formula may include:
s321: and determining an initial fitting formula according to the circuit loss of the radio frequency power calibration circuit and the type of the power detector.
S322: and selecting a plurality of groups of configuration relations between the transmission link gains and the transmission power from the first gain configuration table.
S323: and calibrating parameters in the initial fitting formula according to configuration relations between the gains and the transmitting powers of the transmitting links of each group to obtain a target fitting formula.
In this embodiment, before the actual output power is calculated by using the target fitting formula, the present application may determine an initial fitting formula according to the circuit loss of the radio frequency power calibration circuit and the type of the power detector, and then the present application may arbitrarily select a configuration relationship between a plurality of sets of transmission link gains and transmission powers from the first gain configuration table, and calibrate parameters in the initial fitting formula according to the configuration relationship between each set of transmission link gains and transmission powers, thereby obtaining the target fitting formula.
Specifically, in the application, the main controller samples the value of the power detector at fixed time through the analog-to-digital converter, and according to an initial fitting formula of the output power (Y) and the value (X) acquired by the analog-to-digital converter: y=a2×x 2 +A1 x+A0 calculates the actual output power of the RFID reader system. Wherein, A2, A1 and A0 are determined by directional coupler, attenuation resistor R2, power detector, A/D converter and microstrip line loss in hardware circuit, which can be calibrated by calibration circuit.
Schematically, as shown in fig. 6, fig. 6 is a schematic structural diagram of a calibration circuit according to an embodiment of the present application; in fig. 6, the calibration circuit includes a radio frequency power detection circuit, a transmit chain power driving circuit, a spectrometer/power meter and a PC (computer and its software system), and the present application can select several groups of gain_index from a first Gain configuration table which is pre-coarsely set to calibrate the radio frequency power detection circuit, so as to obtain values of A2, A1 and A0 in an initial fitting formula. It can be appreciated that the more gain_index is selected for calibration, the more y=a2×x is obtained 2 The closer the output power of the reader/writer calculated by the target fitting formula of +a1 x+a0 is to the actual output power value.
Further, in the application, when determining the initial fitting formula, the type of the formula is determined firstly through the type of the power detector, and then parameters A2, A1 and A0 in the initial fitting formula are determined according to the circuit loss of the radio frequency power calibration circuit. For example, when the power detector in the present application is the LMV225, since the LMV225 has a nonlinear characteristic, the initial fitting equation may be set to a form of a quadratic polynomial, and the parameters A2, A1 and A0 in the initial fitting equation are determined according to the circuit loss of the radio frequency power calibration circuit. Of course, if other types of power detectors are selected in the present application, the corresponding initial fitting formula may also be determined according to the characteristics of the type of power detector, which may be specific to the actual situation, and is not limited herein.
In one embodiment, the method may further comprise:
s133: determining a first gain configuration table between the transmission link gains and the transmission power at different working frequencies;
s134: returning to the first gain configuration table under each working frequency, and executing the step of arbitrarily selecting configuration relations between a plurality of groups of transmission link gains and transmission powers from the first gain configuration table until a target fitting formula under each working frequency is obtained; the target fitting formula at each working frequency is used for converting the output voltage at the corresponding working frequency into the transmitting power at the corresponding working frequency.
In this embodiment, the gains of the corresponding transmission links at different operating frequencies are different, which results in different gains of the gain driving units. Therefore, in order to further improve the accuracy of the radio frequency output power of the RFID reader-writer system under different working frequencies, the method can respectively configure the first gain configuration table for different working frequency points (f 1, f2...fx) to determine the first gain configuration table between the gain of the transmitting link and the transmitting power under different working frequencies, and for the first gain configuration table under each working frequency, return to execute the configuration relation between the gains of a plurality of groups of transmitting links and the transmitting power selected arbitrarily from the first gain configuration table, calibrate the parameters in the initial fitting formula according to the configuration relation between the gains of the transmitting links and the transmitting power of each group, and obtain the target fitting formula, thus obtaining different target fitting formulas The purpose of detecting the actual transmitting power by selecting a corresponding target fitting formula according to the corresponding frequency points of the system operation under different working frequencies is achieved.
In one embodiment, the method may further comprise:
s135: a real-time temperature of the power detector is determined.
S136: and determining a power compensation value under the temperature difference according to the temperature difference between the real-time temperature of the power detector and the temperature of the power detector in the normal temperature state.
S137: and carrying out self-adaptive compensation on the actual transmitting power of the transmitting link power driving circuit after the gain configuration according to the power compensation value.
In this embodiment, when the actual transmitting power of the transmitting link power driving circuit is calculated by the target fitting formula, the target fitting formula is a fitting formula configured by the power detector in a normal temperature state, and the power detector itself may have a certain deviation in the detected power at different temperatures due to the influence of the operating environment temperature factors, so that the output voltage input to the main controller also has a certain deviation, and under the influence of the deviation, the adjustment accuracy of the output power of the final RFID reader system is easily caused to be poor.
Therefore, in order to improve the adjustment precision, when the power detector works, the temperature sensor is used for detecting the real-time temperature of the power detector, and the main controller is used for adaptively compensating the actual transmitting power of the transmitting link power driving circuit according to the real-time temperature, so that the deviation is eliminated to a certain extent.
Specifically, the application can firstly determine the real-time temperature of the power detector, and determine the power compensation value under the temperature difference according to the temperature difference between the real-time temperature of the power detector and the temperature in the normal temperature state, and then can carry out self-adaptive compensation on the actual transmitting power calculated by the target fitting formula according to the power compensation value, thereby enabling the finally output actual transmitting power to be more accurate.
Furthermore, the application can determine the power compensation value under different temperature differences through the self-adaptive compensation circuit, and then self-adaptively compensate the actual transmitting power output by the target fitting formula according to the power compensation value. Schematically, as shown in fig. 7, fig. 7 is a schematic structural diagram of an adaptive compensation circuit according to an embodiment of the present application; in fig. 7, the adaptive compensation circuit may include a radio frequency power detection circuit, a transmit chain power driving circuit, a temperature sensor, a spectrometer/power meter, a PC (computer and its software system) and a constant temperature test box of the RFID reader system to be calibrated; the application can Placing the RFID reader-writer system to be calibrated into a constant temperature test box, setting the temperature of the constant temperature test box to be minus 35 ℃, controlling radio frequency output by PC software, and reading the temperature sensor value T1 and the power value Y of the spectrometer T1 Thereby obtaining Δ1=y T1 -Y T0 The method comprises the steps of carrying out a first treatment on the surface of the Then the temperature of the constant temperature test box is set to be minus 25 ℃, the PC software controls the radio frequency output, and the temperature sensor value T2 and the power value Y of the spectrometer are read T2 Thereby obtaining Δ1=y T2 -Y T0 After repeating the above operations, the temperature sensor value T and the power value Y of the spectrometer can be obtained T Further, Δ=y is obtained T -Y T0 。
Schematically, as shown in fig. 8, fig. 8 is a schematic diagram of actual transmission power after adaptive compensation at different temperatures according to an embodiment of the present application; wherein Y is T0 Refers to the actual transmitting power output by a target fitting formula in the application, and delta 1-delta 10 refer to the power compensation value, Y in the application T Refers to the actual transmit power after the adaptive compensation. As can be seen from fig. 8, the present application can adaptively compensate the actual transmitting power output by the target fitting formula according to the real-time temperature of the power detector, thereby further improving the accuracy of the radio frequency output power of the RFID reader system under the wide temperature operating condition.
In one embodiment, the present application also provides a master controller configured to perform the steps of the transmit power closed loop control method according to any of the above embodiments.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and may be combined according to needs, and the same similar parts may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An RFID reader system, the system comprising: a transmit link power driving circuit and a radio frequency power calibration circuit;
the transmitting link power driving circuit comprises a digital baseband and a gain register thereof, a baseband DAC, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof, a filter and a final-stage adjustable gain power amplifier which are connected in sequence;
the radio frequency power calibration circuit comprises a directional coupler, a power detector, an analog-to-digital converter and a main controller;
one end of the directional coupler is connected with the final-stage adjustable gain power amplifier, and the other end of the directional coupler is connected with the power detector and is used for coupling the output power of the final-stage adjustable gain power amplifier to the power detector;
One end of the power detector is connected with the directional coupler, and the other end of the power detector is connected with the input end of the main controller through the analog-to-digital converter and is used for detecting the power coupled by the directional coupler, converting the detected power into output voltage through the analog-to-digital converter and then transmitting the output voltage to the main controller;
the output end of the main controller is respectively connected with the digital baseband and a gain register thereof, the mixer and a gain register thereof, the driving power amplifier and a gain register thereof and the final-stage adjustable gain power amplifier;
the main controller is used for determining the target transmitting power of the transmitting link power driving circuit and acquiring a first gain configuration table between the pre-configured transmitting link gain and the transmitting power; configuring the gain of each gain driving unit in the transmission link power driving circuit based on the target transmission power and the first gain configuration table;
on the other hand, the method is used for obtaining the actual transmitting power of the transmitting link power driving circuit after the gain is configured; comparing the actual transmitting power with the target transmitting power, and determining whether a power error between the actual transmitting power and the target transmitting power exceeds a preset error threshold; if yes, re-determining a target transmitting link gain when the transmitting link power driving circuit reaches the target transmitting power according to the power error; acquiring a second gain configuration table between the gain of the transmitting link and the gain of each gain driving unit; according to the re-determined target transmitting link gain and the second gain configuration table, dynamically adjusting the gain of one or more units in each gain driving unit in the transmitting link power driving circuit again until the power error between the actual transmitting power and the target transmitting power does not exceed the preset error threshold; if not, exiting the closed loop control link;
The actual transmitting power is calculated according to a target fitting formula between the transmitting power and the output voltage of the transmitting link power driving circuit, and the target fitting formula is determined according to the circuit loss of the radio frequency power calibration circuit and the type of the power detector and is obtained after calibration through the configuration relation between the transmitting link gain and the transmitting power in the first gain configuration table.
2. The RFID reader system of claim 1, wherein the system further comprises a temperature sensor;
one end of the temperature sensor is connected with the power detector, the other end of the temperature sensor is connected with the main controller, and the temperature sensor is used for detecting the real-time temperature of the power detector and sending the detected real-time temperature to the main controller, so that the main controller carries out closed-loop control on the actual transmitting power when the gains of all gain driving units in the transmitting link power driving circuit are regulated according to the real-time temperature, and self-adaptive compensation is carried out.
3. A method for closed loop control of transmission power applied to a main controller of an RFID reader system according to any one of claims 1-2, the method comprising:
Determining target transmitting power of a transmitting link power driving circuit, and acquiring a first gain configuration table between a preconfigured transmitting link gain and transmitting power;
configuring the gain of each gain driving unit in the transmission link power driving circuit based on the target transmission power and the first gain configuration table; each gain driving unit in the transmitting link power driving circuit comprises a digital baseband and a gain register thereof, a mixer and a gain register thereof, a driving power amplifier and a gain register thereof and a final-stage adjustable gain power amplifier;
the method comprises the steps of obtaining actual transmitting power of a transmitting link power driving circuit after gain configuration, wherein the actual transmitting power is calculated according to a target fitting formula between the transmitting power and output voltage of the transmitting link power driving circuit, and the target fitting formula is determined according to circuit loss of a radio frequency power calibration circuit and the type of a power detector and is obtained after calibration through configuration relation between the transmitting link gain and the transmitting power in a first gain configuration table;
comparing the actual transmitting power with the target transmitting power, and determining whether a power error between the actual transmitting power and the target transmitting power exceeds a preset error threshold;
If yes, reconfiguring the gain of each gain driving unit in the transmission link power driving circuit according to the power error, and returning to the step of acquiring the actual transmission power of the transmission link power driving circuit after configuring the gain until the power error between the actual transmission power and the target transmission power does not exceed the preset error threshold;
if not, exiting the closed loop control link;
the reconfiguring the gain of each gain driving unit in the transmitting link power driving circuit according to the power error includes:
re-determining a target transmitting link gain when the transmitting link power driving circuit reaches the target transmitting power according to the power error;
acquiring a second gain configuration table between the gain of the transmitting link and the gain of each gain driving unit;
and dynamically adjusting the gain of one or more units of the digital baseband and gain register thereof, the mixer and gain register thereof, the driving power amplifier and gain register thereof and the final-stage adjustable gain power amplifier according to the redetermined target transmitting link gain and the second gain configuration table.
4. The transmission power closed-loop control method according to claim 3, wherein said configuring the gain of each gain driving unit in the transmission link power driving circuit based on the target transmission power and the first gain configuration table comprises:
determining a target transmitting link gain when the transmitting link power driving circuit reaches the target transmitting power according to the target transmitting power and the first gain configuration table;
and configuring the gains of the digital baseband and the gain register thereof, the mixer and the gain register thereof, the driving power amplifier and the gain register thereof and the final-stage adjustable gain power amplifier according to the target transmitting link gain and the second gain configuration table.
5. The method for closed loop control of transmission power according to claim 3, wherein obtaining the actual transmission power of the transmission link power driving circuit after gain configuration comprises:
obtaining output voltage obtained after the detection power of the power detector is converted and input by the analog-to-digital converter;
converting the output voltage into the transmission power according to a target fitting formula between the preset transmission power and the output voltage, and taking the transmission power obtained by conversion as the actual transmission power of the transmission link power driving circuit after gain configuration;
The target fitting formula is a fitting formula set by the power detector in a normal temperature state.
6. The method of claim 5, wherein the process of configuring the target fitting equation comprises:
determining an initial fitting formula according to the circuit loss of the radio frequency power calibration circuit and the type of the power detector;
selecting configuration relations between a plurality of groups of transmission link gains and transmission powers from the first gain configuration table at will;
and calibrating parameters in the initial fitting formula according to configuration relations between the gains and the transmitting powers of the transmitting links of each group to obtain a target fitting formula.
7. The method of transmit power closed loop control of claim 6, further comprising:
determining a first gain configuration table between the transmission link gains and the transmission power at different working frequencies;
returning to the first gain configuration table under each working frequency, and executing the step of arbitrarily selecting configuration relations between a plurality of groups of transmission link gains and transmission powers from the first gain configuration table until a target fitting formula under each working frequency is obtained;
The target fitting formula at each working frequency is used for converting the output voltage at the corresponding working frequency into the transmitting power at the corresponding working frequency.
8. The method of transmit power closed loop control of claim 5, further comprising:
determining a real-time temperature of the power detector;
determining a power compensation value under the temperature difference according to the temperature difference between the real-time temperature of the power detector and the temperature of the power detector in the normal temperature state;
and carrying out self-adaptive compensation on the actual transmitting power of the transmitting link power driving circuit after the gain configuration according to the power compensation value.
9. A master controller, characterized in that the master controller is configured to perform the steps of the transmit power closed loop control method according to any of claims 3 to 8.
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| CN116318449B (en) * | 2023-05-22 | 2023-09-19 | 北京星河亮点技术股份有限公司 | Temperature calibration method and device |
| CN116865792A (en) * | 2023-07-31 | 2023-10-10 | 东集技术股份有限公司 | RFID reader-writer system and transmitting power control method thereof |
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