CN112152675A - NFC antenna resonant frequency adjusting circuit, electronic equipment and calibration method - Google Patents
NFC antenna resonant frequency adjusting circuit, electronic equipment and calibration method Download PDFInfo
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- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
Abstract
The application discloses a Near Field Communication (NFC) antenna resonant frequency adjusting circuit, electronic equipment and a calibration method, and belongs to the technical field of communication. Wherein, NFC antenna resonant frequency adjustment circuit includes: the NFC antenna, the adjustable capacitor component and the controller; the adjustable capacitor component is electrically connected with the NFC antenna; the controller is electrically connected with the adjustable capacitor assembly; the controller adjusts the capacitance value of the adjustable capacitance component according to the frequency of the NFC signal received by the NFC antenna, so that the resonant frequency of the NFC antenna is adjusted to be a target frequency, and the target frequency is matched with the frequency of the NFC signal. According to the embodiment of the application, the accuracy of the communication signal between the NFC antenna and the NFC card reader can be improved.
Description
Technical Field
The application belongs to the technical field of communication, and particularly relates to an NFC antenna resonant frequency adjusting circuit, electronic equipment and a calibration method.
Background
Near Field Communication (NFC) applications are gradually expanding, and a card emulation mode of NFC of an electronic device is used as a common application instead of an NFC ID card. However, there are many NFC card readers in the market which do not meet the standard, and an important feature of such card readers is that the transmission frequency greatly deviates from the NFC regulated frequency: 13.56MHz, which will make it impossible to effectively identify the NFC radio-frequency signal emitted by the card reader in the card emulation mode of NFC of the electronic device, thereby reducing the compatibility of the card emulation mode of NFC of the electronic device.
In the related art, the resonant frequency of the card simulation mode of the NFC of the electronic device is adjusted by increasing the active load modulation intensity, so that the resonant frequency of the card simulation mode of the NFC of the electronic device is matched with the transmission frequency of the NFC card reader.
However, the bandwidth of the resonant frequency of the NFC antenna is narrow, and if the deviation of the resonant point of the NFC antenna increases slightly, the load modulation efficiency decreases greatly, which results in low accuracy of the NFC communication signal.
Disclosure of Invention
An object of the embodiments of the present application is to provide an NFC antenna resonant frequency adjustment circuit, an electronic device, and a calibration method, which can solve the problem of low accuracy of an NFC communication signal.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides an NFC antenna resonant frequency adjustment circuit, including: the NFC antenna, the adjustable capacitor component and the controller;
the adjustable capacitor component is electrically connected with the NFC antenna;
the controller is electrically connected with the adjustable capacitor assembly;
the controller adjusts the capacitance value of the adjustable capacitance component according to the frequency of the NFC signal received by the NFC antenna, so that the resonant frequency of the NFC antenna is adjusted to be a target frequency, and the target frequency is matched with the frequency of the NFC signal.
In a second aspect, an embodiment of the present application provides an electronic device, including the near field communication NFC antenna resonant frequency adjustment circuit described in the first aspect.
In a third aspect, an embodiment of the present application provides an NFC antenna resonant frequency calibration method, configured to calibrate an NFC antenna resonant frequency adjustment circuit according to the first aspect, where the method includes:
the controller sends a control quantity to the adjustable capacitor assembly according to the received calibration signal;
the adjustable capacitor component adjusts a capacitance value according to the control quantity;
a calibration system determines a resonant frequency of the NFC antenna;
the controller receives the resonant frequency of the NFC antenna sent by the calibration system, and stores the resonant frequency of the NFC antenna in association with the capacitance value or stores the resonant frequency of the NFC antenna in association with the control quantity.
In a fourth aspect, the present application provides an electronic device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method according to the third aspect.
In a fifth aspect, the present application provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the third aspect.
In a sixth aspect, embodiments of the present application provide a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the third aspect.
In this embodiment of the application, the controller adjusts the capacitance value of the adjustable capacitance component according to the frequency of the NFC signal received by the NFC antenna, so that the resonant frequency of the NFC antenna is adjusted to a target frequency, and the target frequency is matched with the frequency of the NFC signal, so that the capacitance value of the adjustable capacitance component can be adjusted according to the frequency of the NFC signal sent by the NFC card reader, so that the resonant frequency of the NFC antenna conforms to the transmission frequency of the NFC card reader, and thus the accuracy of a communication signal between the NFC antenna and the NFC card reader is improved.
Drawings
Fig. 1 is a circuit diagram of a resonant frequency adjustment circuit of an NFC antenna according to an embodiment of the present application;
fig. 2 is a circuit diagram of a resonant frequency adjustment circuit of a second NFC antenna according to an embodiment of the present application;
fig. 3 is a circuit diagram of an NFC antenna resonant frequency calibration system provided in an embodiment of the present application;
fig. 4 is a flowchart of an operation of an NFC antenna resonant frequency adjustment circuit provided in an embodiment of the present application;
fig. 5 is a flowchart of an operation of an NFC antenna resonant frequency calibration system provided in an embodiment of the present application;
fig. 6 is a flowchart of an NFC antenna resonant frequency calibration method provided in an embodiment of the present application;
fig. 7 is a block diagram of an electronic device according to an embodiment of the present disclosure;
fig. 8 is a block diagram of another electronic device provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The NFC antenna resonant frequency adjustment circuit, the electronic device, and the NFC antenna resonant frequency calibration method provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1, a circuit diagram of a first NFC antenna resonant frequency adjustment circuit according to an embodiment of the present disclosure is shown in fig. 1, where the NFC antenna resonant frequency adjustment circuit includes: NFC antenna 1, adjustable capacitance component 2 and controller 3.
The adjustable capacitor component 2 is electrically connected with the NFC antenna 1; the controller 3 is electrically connected to the adjustable capacitance assembly 2.
In operation, the controller 3 adjusts the capacitance value of the adjustable capacitance component 2 according to the frequency of the NFC signal received by the NFC antenna 1, so that the resonant frequency of the NFC antenna 1 is adjusted to a target frequency, and the target frequency is matched with the frequency of the NFC signal.
The adjustable capacitor assembly 2 may be a capacitor array, which may include a switch and a plurality of capacitors, so that the connection state of the plurality of capacitors may be changed by controlling the switch state of the switch, thereby changing the capacitance value of the adjustable capacitor assembly 2.
The Controller 3 may be a Micro Controller Unit (MCU), but may also be other processors with a storage function, and the like, and is not limited in particular.
Of course, the adjustable capacitor assembly 2 may include one or more adjustable capacitors, and the adjustable capacitors may change the capacitance value of the adjustable capacitor assembly 2 according to different received control quantities, where the different control quantities may be input currents with different values or input voltages with different values, and the process of adjusting the adjustable capacitors is the same as that of adjusting the adjustable capacitors in the prior art, and is not specifically described herein.
In a specific implementation, the controller 3 may detect the frequency of the NFC signal sent by the NFC reader through an external detection device, or may also actively send the frequency of the NFC signal to the controller 3 by the NFC reader, so that the controller 3 obtains the frequency of the NFC signal that it receives.
For example: as shown in fig. 2, a frequency counter 5 may be further disposed in the NFC antenna resonant frequency adjustment circuit, and the frequency counter 5 is electrically connected to the controller 3 and the adjustable capacitor component 2, so as to detect, by the frequency counter 5, the frequency of the NFC signal received by the NFC antenna 1 and transmitted by the adjustable capacitor component 2, and transmit the frequency to the controller 3.
It should be noted that the frequency counter 5 may be replaced by another detection device capable of detecting the frequency of the NFC signal, and is not limited in detail here.
In practical application, the NFC signal sent by the NFC card reader is a ring magnetic field signal vibrating according to a certain frequency, and the NFC antenna 1 is configured to send a reverse magnetic field signal of a corresponding frequency to cancel or absorb the ring magnetic field signal sent by the NFC card reader, so that the NFC card reader cannot receive the ring magnetic field signal that has been cancelled or absorbed, and thus the NFC card reader can determine that interaction occurs with the analog card device where the NFC antenna 1 is located.
In addition, the above-mentioned adjustment of the resonant frequency of the NFC antenna 1 to the target frequency, where the target frequency matches the frequency of the NFC signal, may be understood as: adjusting the resonant frequency of the NFC antenna 1 to a value where a difference between the resonant frequency of the NFC antenna and the frequency of the NFC signal is smaller than a preset frequency value, or adjusting the capacitance value of the adjustable capacitance component 2 to a target capacitance value, where the target capacitance value may be one of all adjustable capacitance values of the adjustable capacitance component 2, and the resonant frequency of the NFC antenna 1 may be adjusted to an adjustable capacitance value closest to the frequency of the NFC signal.
In practical applications, the correspondence between the capacitance value of the adjustable capacitive component 2 and the resonant frequency of the NFC antenna 1 may be stored in advance, or the correspondence between the control amount of the adjustable capacitance component 2 and the resonance frequency of the NFC antenna 1 is stored in advance, and thus, the frequency of the acquired NFC signal may be determined as a target frequency, and by searching a pre-stored correspondence relationship, a capacitance value or a control amount corresponding to the target frequency is determined, so that the capacitance value of the tunable capacitance component 2 can be tuned to a capacitance value corresponding to the target frequency, or when the control quantity corresponding to the target frequency is output to the adjustable capacitor component 2, the capacitance value of the adjustable capacitor component 2 can be adjusted according to the frequency of the NFC signal received by the NFC antenna 1, so that the resonant frequency of the NFC antenna 1 is adjusted to a target frequency, which matches the frequency of the NFC signal.
The control quantity may be an analog control signal or a digital control signal, and when the adjustable capacitor component 2 receives different control quantities, the capacitance value of the adjustable capacitor component 2 can be adjusted to a capacitance value matching the control quantity in response to the control quantity. For example: if the control amount is 0V (volt) voltage, the tunable capacitor element 2 is at the default capacitance value, and if the control amount is 0.5V, the capacitance value of the tunable capacitor element 2 is increased by 1pF (picofarad) based on the default capacitance value. It should be noted that the numerical values in the above embodiments are merely used as illustrative examples, and in practical applications, the numerical values may be determined according to actual structural parameters of the tunable capacitor assembly 2, and are not specifically limited herein.
In an embodiment, if the controller 3 has a storage function, the correspondence between the capacitance value of the tunable capacitance element 2 and the resonant frequency of the NFC antenna 1, or the correspondence between the control amount of the tunable capacitance element 2 and the resonant frequency of the NFC antenna 1, may be stored in the controller 3 in advance.
In this way, the controller 3 can determine the capacitance value or the control amount corresponding to the frequency of the NFC signal according to the pre-stored correspondence between the capacitance value of the adjustable capacitance component 2 and the resonant frequency of the NFC antenna 1, or the correspondence between the control amount of the adjustable capacitance component 2 and the resonant frequency of the NFC antenna 1, so as to adjust the adjustable capacitance component 2 accordingly, so that the resonant frequency of the NFC antenna 1 is adjusted to the target frequency, and the target frequency is matched with the frequency of the NFC signal.
In another embodiment, as shown in fig. 2, the correspondence between the capacitance value of the adjustable capacitance component 2 and the resonant frequency of the NFC antenna 1, or the correspondence between the control amount of the adjustable capacitance component 2 and the resonant frequency of the NFC antenna 1 may be stored in a memory 4 in advance, and the memory 4 is electrically connected to the controller 3.
In this way, the controller 3 can read the correspondence between the capacitance value of the adjustable capacitance component 2 and the resonant frequency of the NFC antenna 1 from the memory 4, or the correspondence between the control amount of the adjustable capacitance component 2 and the resonant frequency of the NFC antenna 1, and can adjust the adjustable capacitance component 2 accordingly, so that the resonant frequency of the NFC antenna 1 is adjusted to a target frequency, where the target frequency is matched with the frequency of the NFC signal.
In this embodiment of the application, a correspondence between a capacitance value of the adjustable capacitor component 2 and a resonant frequency of the NFC antenna 1 may be stored in advance, or a correspondence between a control amount of the adjustable capacitor component 2 and a resonant frequency of the NFC antenna 1 may be stored in advance. Therefore, the controller can adjust the capacitance value of the adjustable capacitor component according to the frequency of the NFC signal received by the NFC antenna, so that the resonant frequency of the NFC antenna is adjusted to be the target frequency, the target frequency is matched with the frequency of the NFC signal, the capacitance value of the adjustable capacitor component is adjusted according to the frequency of the NFC signal sent by the NFC card reader, the resonant frequency of the NFC antenna is enabled to accord with the transmitting frequency of the NFC card reader, and the accuracy of a communication signal between the NFC antenna and the NFC card reader is improved.
Fig. 2 is a circuit diagram of a resonant frequency adjustment circuit of a second NFC antenna according to an embodiment of the present disclosure. The second NFC antenna resonant frequency adjustment circuit differs from the first NFC antenna resonant frequency adjustment circuit shown in fig. 1 in that: as shown in fig. 2, the second NFC antenna resonant frequency adjustment circuit further includes: memory 4, frequency counter 5, signal converter 6, gain controller 7, application processor 8, NFC signal transmitting component and NFC signal receiving component (not shown).
In a specific implementation, the NFC antenna 1 may be a loop antenna, an NFC signal received by the NFC antenna 1 may be an NFC differential signal, and the signal converter 6 (which may also be referred to as a balun) may be a coil structure that converts the differential signal into a single-ended signal, where one end of the signal converter 6 is a differential output and the other end is a single-ended output, so that conversion between the NFC differential signal and the NFC single-ended signal can be achieved.
Specifically, the signal converter 6 is connected between the tunable capacitor assembly 2 and the controller 3, and the signal converter 6 is configured to convert the NFC differential signal into an NFC single-ended signal, or convert the NFC single-ended signal into an NFC differential signal, where the NFC differential signal is transmitted through the tunable capacitor assembly 2, and the NFC single-ended signal is transmitted through the controller 7. So that no differential circuit is required to be provided in the gain controller 7, the frequency counter 5, the memory 4, the controller 3, and the application processor 8 on the right side of the signal converter 6 as shown in fig. 2, thereby simplifying the structure of the NFC antenna resonant frequency adjustment circuit.
In practical applications, the NFC antenna resonant frequency adjustment circuit may include: the NFC antenna comprises an NFC signal transmitting component and an NFC signal receiving component, wherein the NFC signal transmitting component and the NFC signal receiving component are both connected with the NFC antenna.
It should be noted that, the NFC signal transmitting component and the NFC signal receiving component may be located in the same device or system, for example: as shown in fig. 2, the NFC signal transmitting component and the NFC signal receiving component may also be referred to as: an NFC signal receiving and transmitting System (NFC TX/RX System)20 is configured to implement a receiving/transmitting function of an NFC signal via an NFC antenna, and its specific function and structure are the same as those of an NFC signal receiving and transmitting System in the prior art, and are not described herein again.
It should be noted that, in the related art, if a signal converter capable of being used to implement a function of converting an NFC differential signal and an NFC single-ended signal is disposed in an NFC signal receiving path, the signal converter 6 in the embodiment of the present application may be the same signal converter as the signal converter in the NFC signal receiving path, and only the gain controller 7, the frequency counter 5, the memory 4, the controller 3, the application processor 8, and the like on the right side of the signal converter 6 as shown in fig. 2 need to be disposed at a single-ended signal output end of the signal converter in the NFC signal receiving path.
In operation, the frequency counter 5 is configured to determine a frequency of an NFC signal received by the NFC antenna according to the NFC single-ended signal.
In addition, a gain controller 7 may be further disposed in the NFC antenna resonant frequency adjustment circuit, so as to limit the amplitude (also referred to as amplitude) of the NFC single-ended signal through the gain controller 7, thereby adjusting the signal amplitude of the NFC single-ended signal to be within a rated amplitude range of the frequency counter 5.
In a specific implementation, the Gain controller 7 may be an Automatic Gain Controller (AGC), but of course, it may also be other devices or apparatuses capable of limiting the amplification of the magnetic field signal, and is not limited in detail.
Thus, the phenomenon that the amplitude of the NFC single-ended signal exceeds the maximum amplitude of devices such as the frequency counter 5 and the like, so that the devices such as the frequency counter 5 and the like are damaged can be avoided.
In practical application, the corresponding relationship between the resonant frequency of the NFC antenna 1 and the capacitance value of the adjustable capacitive component 2 needs to be calibrated in advance, or the corresponding relationship between the resonant frequency of the NFC antenna 1 and the control quantity of the adjustable capacitive component 2 needs to be calibrated in advance, where the adjustable capacitive component 2 is in different capacitance values when acquiring different control quantities. The following description will exemplify the calibration process by taking the corresponding relationship between the resonant frequency of the calibration NFC antenna 1 and the control amount of the adjustable capacitance element 2 as an example:
in operation, the application processor 8 is configured to, under the action of the calibration system 30, drive the controller 3 to transmit a target control quantity to the adjustable capacitive component 2, and receive the resonant frequency of the NFC antenna 1 detected by the calibration system 30, and store the target control quantity and the resonant frequency of the NFC antenna in association.
For example: as shown in fig. 3, the application processor 8 may be connected to a calibration device 32 in a calibration system 30 via a data connection 31, so that, when the calibration device 32 sends the calibration signal to the application processor 8, the application processor 8 can control the controller 3 to send the target control quantity to the adjustable capacitive component 2, and is coupled to the NFC antenna 1 via the NFC calibration antenna 33 in the calibration system 30, so as to be able to acquire the NFC antenna 1 transceive signals, and transmit the transceived signals to the vector network analyzer 34 in the calibration system 30, so as to analyze the transceiving signal and obtain the resonant frequency of the NFC antenna 1, and transmit the resonant frequency to the application processor 8 through the calibration device 32 and the data connection line 31, so that the controller 3 can store the resonance frequency received by the application processor 8 in association with the current control amount (i.e., the target control amount) of the adjustable capacitance component 2 in the memory 4.
The calibration device 32 may be a Personal Computer (PC) for calibration. And the data connection line 31 may be a Universal Serial Bus (USB) line or an Asynchronous Receiver/Transmitter (UART).
It should be noted that the calibration process is an iterative process. Specifically, the controller 3 transmits different control quantities to the adjustable capacitance component 2 in each iteration until the calibration is finished after each different control quantity that the controller 3 can output is respectively associated and stored with the corresponding resonant frequency, and the calibration system 30 can detect the resonant frequency of the NFC antenna 1 at each different control quantity, thereby implementing the association and storage of each different control quantity and the resonant frequency under the action thereof in the memory 4.
Like this, can order to use processor 8 to send the controlled quantity of different values to adjustable capacitor assembly 2 through calibration system, and detect through calibration system and obtain the resonant frequency of NFC antenna 1 under this controlled quantity effect, thereby obtain the corresponding relation between controlled quantity and the resonant frequency, like this, when confirming to adjust the resonant frequency of NFC antenna 1 to target resonant frequency, alright according to the corresponding relation between predetermined controlled quantity and resonant frequency, confirm the target controlled quantity that corresponds with this target resonant frequency, thereby make processor 8 export this target controlled quantity to adjustable capacitor assembly 2, alright realize adjusting the resonant frequency of NFC antenna 1 to above-mentioned target resonant frequency.
In this embodiment, the signal converter 6 is connected between the tunable capacitor assembly 2 and the gain controller 7, the frequency counter 5 is connected between the gain controller 7 and the controller 3, the memory 4 is connected to the controller 3 and the application processor 8, respectively, and the controller 3 is connected to the application processor 8.
It should be noted that, when the gain controller 7 is not provided in the NFC antenna resonant frequency adjustment circuit, the signal converter 6 may be connected between the adjustable capacitor element 2 and the frequency counter 5, or when the frequency counter 5 is not provided in the NFC antenna resonant frequency adjustment circuit, the signal converter 6 may be connected between the adjustable capacitor element 2 and the controller 3, which is not particularly limited herein.
And the signal converter 6 is connected between the adjustable capacitor component 2 and the controller 3, and is used for converting the NFC differential signal transmitted by the adjustable capacitor component 2 and the NFC single-ended signal transmitted by the controller 3 into each other.
The following takes the operation flow chart shown in fig. 4 as an example, and illustrates the operation flow of the NFC antenna resonant frequency adjustment circuit shown in fig. 1 or fig. 2:
In this step, the card reader information is an NFC signal sent by an NFC card reader.
The transmission frequency of the card reader is the frequency of the NFC signal sent by the NFC card reader.
And step 403, the controller determines the control quantity according to the transmitting frequency of the card reader.
If the correspondence between the control amount and the resonant frequency is stored in advance before step 403, the determining of the control amount according to the transmission frequency of the card reader may be performed by setting the transmission frequency of the card reader as a target frequency and determining the control amount corresponding to the target frequency according to the correspondence between the control amount and the resonant frequency.
And step 404, the controller outputs the control quantity to the adjustable capacitor assembly so as to adjust the capacitance value of the adjustable capacitor assembly and realize the tuning of the antenna.
In this step, the tuning of the antenna may be realized by adjusting the resonant frequency of the NFC antenna to match the target frequency.
Above-mentioned work flow can be according to the capacitance value of the adjustable capacitor assembly of transmitting frequency adjustment of NFC card reader to make the resonant frequency of NFC antenna and the transmitting frequency matching of NFC card reader, thereby can promote the accuracy of the NFC signal of transmission between NFC card reader and the NFC antenna.
The following takes the operation flow chart shown in fig. 5 as an example, and illustrates the operation flow of the NFC antenna resonant frequency adjustment circuit and calibration system 30 shown in fig. 3:
In this step, the application processor is connected to the calibration device in the calibration system.
The initialization control quantity may be a control quantity transmitted to the tunable capacitance component by the initialization controller, and specifically, the control quantity transmitted to the tunable capacitance component by the controller may be adjusted to 0.
In addition, initializing a mapping table between the control quantity and the resonant frequency in the memory, wherein each different control quantity in the mapping table is determined, and the resonant frequency corresponding to each control quantity is a parameter to be determined; alternatively, the mapping table may be cleared, that is, the control quantity and the resonant frequency in the mapping table are deleted.
In this step, when the adjustable capacitor component is turned off, the resonant frequency of the NFC antenna is at the preset resonant frequency in the non-tuning state.
In this step, the NFC calibration antenna is specifically coupled with the NFC antenna to obtain a transmit-receive signal of the NFC antenna, and transmit the transmit-receive signal to the vector network analyzer, analyze the transmit-receive signal to obtain a resonant frequency of the NFC antenna, and finally transmit the resonant frequency of the NFC antenna obtained by analysis to the application processor through the calibration device.
And 505, the application processor stores the preset resonant frequency and the non-control quantity in a memory in an associated manner.
Wherein, the above-mentioned non-control quantity can be understood as that the capacitance value provided by the adjustable capacitance component is 0.
Wherein, in the case that the judgment result of the step 506 is yes, the calibration process is ended; if the determination result in step 506 is "no", step 507 is executed.
And step 507, controlling the incremental lift control quantity according to the unit.
The controller transmits the boosted control quantity to the adjustable capacitor assembly so as to change the capacitance value of the adjustable capacitor assembly.
Specifically, the unit control increment may be understood as: the minimum increment of the control amount that the controller can output is specifically related to the accuracy of the controller and is not specifically limited herein.
In step 509, the application processor stores the current controlled variable output by the controller and the received resonant frequency of the NFC antenna in association with each other in a mapping table between the controlled variable and the resonant frequency.
In this embodiment, a calibration system may be used to calibrate a correspondence between a control quantity in the NFC antenna resonant frequency adjustment circuit and a resonant frequency of the NFC antenna, so that the NFC antenna resonant frequency adjustment circuit may determine, during operation, a control quantity corresponding to the resonant frequency of the NFC signal received by the NFC antenna based on the correspondence between the control quantity and the resonant frequency of the NFC antenna, and output the control quantity to the adjustable capacitor component, so as to adjust the resonant frequency of the NFC antenna to a target frequency, where the target frequency is matched with the frequency of the NFC signal.
The embodiment of the present application further provides an electronic device, which includes any one of the NFC antenna resonant frequency adjustment circuits provided in the embodiments of the present application.
In specific implementation, the electronic device in the embodiment of the present application may be a mobile electronic device, and may also be a non-mobile electronic device. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a Network Attached Storage (NAS), a personal computer (personal computer, PC), a Television (TV), a teller machine, a self-service machine, and the like, and the embodiments of the present application are not limited in particular.
In application, the electronic device provided in the embodiment of the present application has a function of simulating a card, for example: an analog Radio Frequency Identification (RFID) card.
Under the condition that the electronic equipment executes the analog card function, the electronic equipment can realize information interaction with an NFC card reader by transmitting or receiving an NFC signal, so that the NFC card reader can read response information.
The electronic equipment that this application embodiment provided can adjust the resonant frequency of NFC antenna according to the frequency of the NFC signal that NFC card reader sent, has the same beneficial effect with the NFC antenna resonant frequency adjusting circuit that this application embodiment provided, for avoiding repeating no longer giving details here.
Please refer to fig. 6, which is a flowchart illustrating a method for calibrating a resonant frequency of an NFC antenna according to an embodiment of the present disclosure, where the method for calibrating a resonant frequency of an NFC antenna is used to calibrate an NFC antenna resonant frequency adjustment circuit according to a circuit embodiment of the present disclosure, as shown in fig. 6, the method for calibrating a resonant frequency of an NFC antenna may include the following steps:
In specific implementation, the NFC antenna resonant frequency calibration method provided in the embodiment of the present application may be applied to the calibration system 30 and an NFC antenna resonant frequency adjustment circuit connected to the calibration system 30 as shown in fig. 3.
The calibration signal can be sent by a calibration device in the calibration system and transmitted to the controller through the application processor.
And step 602, the adjustable capacitor component adjusts a capacitance value according to the control quantity.
In this step, the calibration system may be the calibration system 30 shown in fig. 3, and at this time, a process of the calibration system determining the resonant frequency of the NFC antenna may be the same as the process of determining the resonant frequency of the NFC antenna through the NFC calibration antenna and the vector network analyzer shown in fig. 3, and details are not repeated here.
And step 604, the controller receives the resonant frequency of the NFC antenna sent by the calibration system, and stores the resonant frequency of the NFC antenna in association with the capacitance value or stores the resonant frequency of the NFC antenna in association with the control quantity.
In a specific implementation, the specific process of storing the resonant frequency of the NFC antenna in association with the capacitance value or storing the resonant frequency of the NFC antenna in association with the control amount is the same as the process of storing the resonant frequency of the NFC antenna in association with the capacitance value or storing the resonant frequency of the NFC antenna in association with the control amount in the NFC antenna resonant frequency adjustment circuit provided in the present application, and is not repeated here.
In the embodiment of the application, the resonant frequency of the NFC antenna in the NFC antenna resonant frequency adjustment circuit and the associated capacitance value or control amount are calibrated, so that the NFC antenna resonant frequency adjustment circuit can adjust the capacitance value of the adjustable capacitance component according to the capacitance value or control amount associated with the frequency after determining the frequency of the NFC signal sent by the NFC card reader, so that the resonant frequency of the NFC antenna is adjusted to the target frequency conforming to the frequency of the NFC signal, and the accuracy of the NFC signal transmitted between the NFC antenna and the NFC card reader is improved.
As an optional implementation, the sending, by the controller, the target control quantity to the adjustable capacitance component according to the received calibration signal includes:
the controller iteratively sends a control quantity to the adjustable capacitor component according to the received calibration signal;
and stopping iteration until the capacitance value of the adjustable capacitance component reaches the maximum adjustable capacitance value from the minimum adjustable capacitance value.
In a specific implementation, the control quantity sent in the current iteration is a sum of the control quantity sent in the last iteration and a unit control increment, and may be represented as: the control quantity sent by the controller is gradually increased, and each increment is a unit control increment, such as: the control quantity sent by the controller in the nth iteration is KnThe control quantity sent by the controller in the (n-1) th iteration is Kn-1And Kn is Kn-1+ Δ K, where Δ K represents the unit control increment.
In the iteration process, after the (N-1) th iteration process is completed and the control quantity of the (N-1) th iteration process and the resonant frequency of the NFC antenna are stored in a correlated mode, the nth iteration process is executed, wherein N can be any integer from 1 to N, N represents the total iteration number of the control quantity, and the capacitance value of the adjustable capacitance component reaches the maximum adjustable capacitance value when the nth iteration is executed.
The iteration process is similar to the iteration process for calibrating the corresponding relationship between the control quantity and the resonant frequency of the NFC antenna in the NFC antenna resonant frequency adjustment circuit provided by the present application, and is not repeated here.
In the present embodiment, the correspondence between each different control amount and the resonant frequency of the NFC antenna under the action of the control amount can be determined.
It should be noted that the NFC antenna resonant frequency calibration method provided in the embodiment of the present application may also be applied to other calibration devices or calibration systems besides the calibration system 30 shown in fig. 3, and the application scenario of the NFC antenna resonant frequency calibration method provided in the embodiment of the present application is not limited herein.
Optionally, as shown in fig. 7, an electronic device 700 is further provided in this embodiment of the present application, and includes a processor 701, a memory 702, and a program or an instruction stored in the memory 702 and executable on the processor 701, where the program or the instruction is executed by the processor 701 to implement each process of the embodiment of the NFC antenna resonant frequency calibration method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and the non-mobile electronic devices described above.
Fig. 8 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.
The electronic device 800 includes, but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, and a processor 810.
Those skilled in the art will appreciate that the electronic device 800 may further comprise a power source (e.g., a battery) for supplying power to the various components, and the power source may be logically connected to the processor 810 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system. The electronic device structure shown in fig. 8 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is omitted here.
An NFC antenna resonant frequency adjustment circuit as shown in fig. 1 or fig. 2 is further disposed in the electronic device 800, and a controller in the NFC antenna resonant frequency adjustment circuit may be the processor 810, and the radio frequency unit 801 may include an NFC antenna.
The processor 810 is configured to send a control quantity to the adjustable capacitance component according to the received calibration signal;
the adjustable capacitor component adjusts a capacitance value according to the control quantity;
a calibration system determines a resonant frequency of the NFC antenna;
the processor 810 is further configured to receive the resonant frequency of the NFC antenna sent by the calibration system, and store the resonant frequency of the NFC antenna in association with the capacitance value or store the resonant frequency of the NFC antenna in association with the control quantity.
Optionally, the sending, by the processor 810, the target control quantity to the adjustable capacitance component according to the received calibration signal includes:
the processor 810 iteratively sends a control quantity to the adjustable capacitor assembly according to the received calibration signal;
and stopping iteration until the capacitance value of the adjustable capacitance component reaches the maximum adjustable capacitance value from the minimum adjustable capacitance value.
The electronic device provided by the embodiment of the application can realize each process of the NFC antenna resonant frequency calibration method provided by the embodiment of the application, and can obtain the same beneficial effect, and for avoiding repetition, the details are not repeated here.
It should be understood that, in the embodiment of the present application, the input Unit 804 may include a Graphics Processing Unit (GPU) and a microphone, and the Graphics Processing Unit processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 806 may include a display panel, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 807 includes a touch panel and other input devices. Touch panels, also known as touch screens. The touch panel may include two parts of a touch detection device and a touch controller. Other input devices may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein. The memory 809 may be used to store software programs as well as various data including, but not limited to, application programs and operating systems. The processor 810 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 810.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the embodiment of the NFC antenna resonant frequency calibration method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the embodiment of the NFC antenna resonant frequency calibration method, and can achieve the same technical effect, and in order to avoid repetition, the details are not repeated here.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
It should be noted that, in this document, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A Near Field Communication (NFC) antenna resonant frequency adjustment circuit, comprising: the NFC antenna, the adjustable capacitor component and the controller;
the adjustable capacitor component is electrically connected with the NFC antenna;
the controller is electrically connected with the adjustable capacitor assembly;
the controller adjusts the capacitance value of the adjustable capacitance component according to the frequency of the NFC signal received by the NFC antenna, so that the resonant frequency of the NFC antenna is adjusted to be a target frequency, and the target frequency is matched with the frequency of the NFC signal.
2. The circuit of claim 1, wherein the NFC signal received by the NFC antenna is an NFC differential signal, wherein the adjustable capacitive component comprises a differential circuit, and wherein the NFC antenna resonant frequency adjustment circuit further comprises:
the signal converter is connected between the adjustable capacitor component and the controller, and is used for converting an NFC differential signal into an NFC single-ended signal or converting an NFC single-ended signal into an NFC differential signal, wherein the NFC differential signal is transmitted through the adjustable capacitor component, and the NFC single-ended signal is transmitted through the controller.
3. The circuit of claim 2, further comprising:
the frequency counter is connected between the signal converter and the controller and used for determining the frequency of the NFC signal received by the NFC antenna according to the NFC single-ended signal.
4. The circuit of claim 3, further comprising:
and the gain controller is connected between the signal converter and the frequency counter and is used for adjusting the signal amplitude of the NFC single-ended signal to be within a rated amplitude range of the frequency counter.
5. The circuit of any one of claims 1-4, further comprising:
an application processor connected with the controller and configured to communicatively couple with a calibration system;
the application processor is used for driving the controller to send a target control quantity to the adjustable capacitor component under the action of the calibration system, receiving the resonant frequency of the NFC antenna detected by the calibration system, and storing the target control quantity and the resonant frequency of the NFC antenna in an associated mode.
6. The circuit of any of claims 2-4, further comprising: the NFC antenna comprises an NFC signal transmitting component and an NFC signal receiving component, wherein the NFC signal transmitting component and the NFC signal receiving component are both connected with the NFC antenna.
7. The circuit of claim 6, wherein the signal converter is a signal converter in the NFC signal receiving component.
8. An electronic device, characterized in that it comprises a near field communication, NFC, antenna resonant frequency adjustment circuit according to any of claims 1-7.
9. A Near Field Communication (NFC) antenna resonant frequency calibration method for calibrating the NFC antenna resonant frequency adjustment circuit of any one of claims 1-7, the method comprising:
the controller sends a control quantity to the adjustable capacitor assembly according to the received calibration signal;
the adjustable capacitor component adjusts a capacitance value according to the control quantity;
a calibration system determines a resonant frequency of the NFC antenna;
the controller receives the resonant frequency of the NFC antenna sent by the calibration system, and stores the resonant frequency of the NFC antenna in association with the capacitance value or stores the resonant frequency of the NFC antenna in association with the control quantity.
10. The method of claim 9, wherein the controller sending a target control quantity to the adjustable capacitive component based on the received calibration signal comprises:
the controller iteratively sends a control quantity to the adjustable capacitor component according to the received calibration signal;
and stopping iteration until the capacitance value of the adjustable capacitance component reaches the maximum adjustable capacitance value from the minimum adjustable capacitance value.
11. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the near field communication, NFC, antenna resonant frequency calibration method according to claim 9 or 10.
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| CN202011038813.1A CN112152675B (en) | 2020-09-28 | 2020-09-28 | NFC antenna resonant frequency adjusting circuit, electronic equipment and calibration method |
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| CN202011038813.1A CN112152675B (en) | 2020-09-28 | 2020-09-28 | NFC antenna resonant frequency adjusting circuit, electronic equipment and calibration method |
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