CN215990792U - Near field communication device and electronic equipment - Google Patents
Near field communication device and electronic equipment Download PDFInfo
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- CN215990792U CN215990792U CN202122637503.8U CN202122637503U CN215990792U CN 215990792 U CN215990792 U CN 215990792U CN 202122637503 U CN202122637503 U CN 202122637503U CN 215990792 U CN215990792 U CN 215990792U
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- 238000012545 processing Methods 0.000 claims abstract description 35
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- 238000001514 detection method Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 description 14
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- 238000010586 diagram Methods 0.000 description 4
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- 239000000696 magnetic material Substances 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000000737 periodic effect Effects 0.000 description 2
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- 238000002955 isolation Methods 0.000 description 1
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Abstract
The application discloses near field communication device and electronic equipment, this near field communication device includes: the antenna comprises a processing module, a first antenna and a second antenna; the first antenna is connected with the processing module, and transmits a radio frequency signal under the action of a driving signal of the processing module; the second antenna is connected with the processing module, receives an electric signal generated by a target antenna in the target near field communication device under the action of the radio frequency signal, and transmits the electric signal to the processing module; the first antenna is an annular structure, the second antenna is surrounded by the annular structure, and the first antenna and the second antenna are arranged at intervals.
Description
Technical Field
The present application relates to the field of electronic product technologies, and in particular, to a near field communication device and an electronic apparatus.
Background
Near Field Communication (NFC) technology enables NFC devices to exchange data in close proximity to each other, and is used in many fields. The NFC device may be mounted on an electronic device (e.g., a terminal device such as an NFC card reader or a mobile phone), an NFC card, or the like.
Taking near field communication between the NFC card reader and the NFC card as an example, when the NFC card reader reads a card, the NFC card reader sends a radio frequency signal to the NFC card through the NFC antenna, and the NFC antenna in the NFC card acquires energy of the radio frequency signal and drives a circuit inside the NFC card to work. In addition, part of the NFC card reader (or other card reading devices) may further be provided with an antenna for receiving an electric signal generated by oscillation of an NFC antenna in the NFC card under the action of a radio frequency signal transmitted by the NFC card reader, and the like, so that the occupied space is also large when the number of antennas arranged in the NFC card reader (or other card reading devices) is large.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a near field communication device and electronic equipment, and aims to solve the problem that the occupied space is large when the number of antennas of the near field communication device is large.
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 a near field communication apparatus, including:
a processing module;
the first antenna is connected with the processing module, and transmits a radio frequency signal under the action of a driving signal of the processing module;
the second antenna is connected with the processing module, receives an electric signal generated by a target antenna in a target near field communication device under the action of the radio frequency signal, and transmits the electric signal to the processing module;
the first antenna is an annular structure, the second antenna is surrounded by the annular structure, and the first antenna and the second antenna are arranged at intervals.
In a second aspect, the present application further provides an electronic device including the near field communication apparatus as described above.
In this way, in the above scheme of the present application, the near field communication device includes a first antenna and a second antenna, where the first antenna may transmit a radio frequency signal under the action of the driving signal of the processing module, and the second antenna may receive an electrical signal generated by a target antenna in the target near field communication device under the action of the radio frequency signal; the first antenna is an annular structure, the second antenna is surrounded by the annular structure, and the first antenna and the second antenna are arranged at intervals, namely the first antenna and the second antenna can be nested, so that the space occupation of the plurality of antennas in the near field communication device can be reduced.
Drawings
Fig. 1 shows one of the schematic diagrams of a near field communication device according to an embodiment of the present application;
fig. 2 shows a second schematic diagram of a near field communication device according to an embodiment of the present application;
fig. 3 is a schematic diagram of an equivalent circuit of a target antenna according to an embodiment of the present application.
Description of reference numerals:
11. a processing module; 111. a drive circuit; 112. a detection circuit; 113. a processor;
12. a first antenna; 121. a first coil;
13. a second antenna; 131. a second coil.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present application provides a near field communication apparatus, including: a processing module 11, a first antenna 12 and a second antenna 13.
The first antenna 12 is connected with the processing module 11, and the first antenna 12 transmits a radio frequency signal under the action of a driving signal of the processing module 11; the second antenna 13 is connected to the processing module 11, and the second antenna 13 receives an electrical signal generated by a target antenna in the target nfc device under the action of the radio frequency signal and transmits the electrical signal to the processing module 11.
The first antenna 12 is an annular structure, the annular structure surrounds the second antenna 13, and the first antenna 12 and the second antenna 13 are spaced apart from each other.
Optionally, the near field communication device in this embodiment of the present application may perform data interaction with the target near field communication device through the first antenna 12, for example, the first antenna 12 may transmit data to the target near field communication device, and may also receive data transmitted by the target near field communication device. The target near field communication device may be mounted in an NFC device or an NFC card, which is not limited in this embodiment of the application.
Optionally, the second antenna 13 receives an electrical signal generated by a target antenna in the target near field communication device under the action of the radio frequency signal, and may be an electrical signal generated by oscillation of the target antenna when receiving the radio frequency signal, and the oscillation frequency of the electrical signal may represent the resonant frequency of the target antenna.
For example: when the first antenna 12 transmits a radio frequency signal under the action of the driving signal of the processing module 11, the target near field communication device may store energy through an energy storage element therein when receiving the radio frequency signal. The first antenna 12 stops transmitting the rf signal after a first time period (for example, the processing module 11 stops outputting the driving signal), and the target antenna in the target nfc device may generate LC oscillation based on the stored energy, and the second antenna 13 may couple the electrical signal generated by the target antenna during the LC oscillation, and the processing module 11 may collect the voltage value of the electrical signal.
The voltage value of the electric signal is periodically changed along with the resonant frequency of the target antenna, so that the resonant frequency of the target antenna can be determined according to the electric signal, namely, the near field communication device can have the function of acquiring the resonant frequency of the target antenna of the target near field communication device, and further the near field communication device can adjust the frequency of the radio frequency signal transmitted by the near field communication device according to the resonant frequency of the target antenna, so that the problem that data transmission cannot be effectively carried out due to the fact that the radio frequency signal transmitted by the near field communication device is inconsistent with the resonant frequency of the target antenna in the target near field communication device can be solved.
In the above scheme, the near field communication device includes a first antenna 12 and a second antenna 13, and the first antenna 12 may transmit a radio frequency signal under the action of the driving signal of the processing module 11, and the second antenna 13 may receive an electrical signal generated by a target antenna in the target near field communication device under the action of the radio frequency signal, because the first antenna 12 is a loop structure, the loop structure surrounds the second antenna 13, and the first antenna 12 and the second antenna 13 are arranged at intervals, that is, the first antenna 12 and the second antenna 13 may be arranged in a nested manner, so that the space occupation of multiple antennas in the near field communication device may be reduced.
Optionally, a magnetic structure is arranged between the first antenna 12 and the second antenna 13; the magnetic structure is annular and surrounds the second antenna 13.
For example: filling a gap formed by the interval between the first antenna 12 and the second antenna 13 with a magnetic material to form the magnetic structure; wherein, the gap formed by the interval between the first antenna 12 and the second antenna 13 is annular, and the magnetic structure formed by the filled magnetic material is annular. Or, the annular magnetic structure is prepared in advance based on the size of the gap formed by the interval between the first antenna 12 and the second antenna 13, and the magnetic structure is disposed between the first antenna 12 and the second antenna 13, and the like, which is not limited in this embodiment of the application.
Alternatively, the magnetic material may be a ferrite material.
In this embodiment, a magnetic structure is disposed between the first antenna 12 and the second antenna 13 for magnetic field isolation, so as to reduce interference of energy on the first antenna 12 when receiving and transmitting radio frequency signals to the second antenna 13, thereby ensuring accuracy of detecting a resonant frequency of a target antenna through the second antenna 13, and avoiding interference of energy on the second antenna 13 when receiving electrical signals to the first antenna 12.
As shown in fig. 2, the first antenna 12 includes: a first coil 121, wherein the first coil 121 is connected with the processing module 11; the first coil 121 surrounds the second antenna 13, and the first coil 121 and the second antenna 13 are spaced apart from each other.
For example: the first coil 121 is a coil used for data interaction with a target nfc device in the nfc device, and may be formed by a conducting wire surrounding a central position for a plurality of turns, and the central position of the first coil 121 has an accommodating space, that is, the first coil 121 is in an annular structure. By thus disposing the second antenna 13 in the accommodating space, the occupation of space by the plurality of antennas in the near field communication device can be reduced.
Optionally, the second antenna 13 includes: a second coil 131, wherein the second coil 131 is connected with the processing module 11.
For example: the second coil 131 is a coil for receiving an electric signal generated by the target antenna in the target near field communication device under the action of the radio frequency signal.
Alternatively, in the case where the first antenna 12 includes the first coil 121 and the second antenna 13 includes the second coil 131, the magnetic structure may be disposed between the first coil 121 and the second coil 131.
Optionally, the processing module 11 includes: a drive circuit 111 and a detection circuit 112.
The first antenna 12 is connected to the driving circuit 111, and the first antenna 12 transmits a radio frequency signal under the action of a driving signal of the driving circuit 111; the second antenna 13 is connected to the detection circuit 112, and the second antenna 13 transmits the received electrical signal to the detection circuit 112.
Alternatively, the detection circuit 112 may collect a voltage value of the electrical signal.
Optionally, the detection circuit 112 includes: an analog-to-digital converter; the analog-to-digital converter is connected to the second antenna 13. For example: the analog-to-digital converter may perform analog-to-digital conversion on the analog signal corresponding to the voltage value acquired by the second antenna 13 to obtain a digital signal corresponding to the voltage value.
Optionally, the processing module further includes: a processor 113, wherein the processor 113 is connected to the driving circuit 111 and the detecting circuit 112 respectively.
Wherein, the processor 113 outputs a control signal to the driving circuit 111, and the driving circuit 111 outputs the driving signal to the first antenna 12 under the action of the control signal; and, the detection circuit 112 collects the voltage value of the electrical signal and transmits the voltage value to the processor 113.
For example: the input end of the analog-to-digital converter is connected with the second antenna 13, and the output end of the analog-to-digital converter is connected with the processor 113. Specifically, the analog-to-digital converter may perform analog-to-digital conversion on an analog signal corresponding to the voltage value acquired on the second antenna 13 to obtain a digital signal corresponding to the voltage value, and transmit the digital signal to the processor 113 for processing, for example, the processor 113 may determine a periodic variation rule of the electrical signal coupled to the second antenna 13 according to the digital signal, that is, a resonant frequency of the target antenna, and may further adjust the frequency of the radio frequency signal transmitted by the first antenna 12 according to the resonant frequency of the target antenna, so as to ensure that data transmission can be effectively performed between the near field communication device and the target near field communication device.
Optionally, the driving circuit 111 may also be referred to as an NFC driving circuit module, and is configured to drive the first antenna 12 (i.e., an NFC antenna) to transmit and receive information transferred from a target near field communication device (e.g., an NFC card); the first antenna 12, which may also be referred to as an NFC antenna module, is an antenna used by an NFC-enabled device for transmitting NFC signals.
Optionally, in a case that the second antenna 13 includes a second coil 131, a first connection end of the second coil 131 is connected to the first input end of the detection circuit 112, a second connection end of the first coil 131 is connected to the second input end of the detection circuit 112, and an output end of the detection circuit 112 is connected to the processor 113.
Optionally, the first antenna 12 includes: a second coil 121; a first connection end of the second coil 121 is connected to the first transmission end of the driving circuit 111, a second connection end of the second coil 121 is connected to the second transmission end of the driving circuit 111, and a third transmission end of the driving circuit 121 is connected to the processor 113.
Wherein, in the case that the signal transmission path is from the processor 113 to the first antenna 12 via the driving circuit 111, the first transmission terminal and the second transmission terminal are used as the output terminals, and the third transmission terminal is used as the input terminal; in the case where a signal transmission path is from the first antenna 12 to the processor 113 through the driving circuit 111, the first transmission terminal and the second transmission terminal serve as input terminals, and the third transmission terminal serves as an output terminal.
The embodiment of the application can not be limited to being applied to an NFC working scene, and the implementation logic based on the application can detect the resonant frequency of other equipment such as wireless charging slave equipment and low-frequency access card equipment, and the transmission frequency of carrier waves is adjusted based on the resonant frequency, so that the effective transfer of energy between the master equipment and the slave equipment can be obtained.
Embodiments of the present application further provide an electronic device, which includes the above-mentioned near field communication device, and can implement various embodiments that can be implemented by the above-mentioned near field communication device, and can achieve the same technical effects, and in order to avoid repetition, details are not repeated here.
In the following, by combining near field communication between the NFC card reading device and the NFC card, and by setting the near field communication device in the embodiment of the present application in the NFC card reader and setting the target near field communication device in the NFC card, as an example, a process of detecting the resonant frequency of the NFC card through the second coil in the present application is described:
as shown in fig. 3, which shows an equivalent circuit schematic diagram of a target antenna in a target near field communication device, a resistor R1, a coil L1 and a capacitor C1 form an LC oscillating circuit. When NFC card reading equipment with an NFC card reading function such as a mobile phone needs to read cards, a driving circuit drives an NFC antenna (namely a first antenna) to send a carrier signal of 13.56 MHz; an antenna coil L1 (namely a target antenna) on the NFC card is coupled with energy sent by the NFC card reading device, and a capacitor C1 on the NFC card stores energy; the driving circuit stops sending the carrier signal after sending the carrier signal for a period of time; the NFC card generates LC oscillation based on the stored energy, and the oscillation frequency is the resonance frequency of the NFC card; detecting a voltage coupled when the NFC antenna oscillates based on the second coil due to the fact that the second coil is coupled with the antenna coil of the NFC card; the voltage is periodically changed along with the resonant frequency of the NFC card, the detection circuit detects the voltage at two ends of the second coil and sends the detected voltage value to the processor; the processor calculates the variation period of the voltage based on the periodic variation of the voltage, and the period is the resonant frequency f of the NFC card.
Therefore, the embodiment of the application can ensure that the NFC card reading equipment can effectively detect the resonant frequency of the antenna coil of the NFC card, and after the resonant frequency of the NFC card is obtained, the NFC driving circuit can be controlled to adjust the transmitted carrier frequency to be equal to the resonant frequency of the NFC card, so that the carrier transmission frequency can be adjusted based on different cards to effectively drive the NFC card to work; and a first coil for carrying out data transmission with NFC and a second coil for detecting the resonant frequency of the NFC card are nested, so that the occupation of a plurality of coils in the NFC card reading equipment on the space can be effectively reduced.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. 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 terminal that comprises the element.
While the foregoing is directed to the preferred embodiment of the present application, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the disclosure and, therefore, the scope of the disclosure is to be defined by the appended claims.
Claims (8)
1. A near field communication device, comprising:
a processing module;
the first antenna is connected with the processing module, and transmits a radio frequency signal under the action of a driving signal of the processing module;
the second antenna is connected with the processing module, receives an electric signal generated by a target antenna in a target near field communication device under the action of the radio frequency signal, and transmits the electric signal to the processing module;
the first antenna is an annular structure, the second antenna is surrounded by the annular structure, and the first antenna and the second antenna are arranged at intervals.
2. Near field communication device according to claim 1, characterized in that the first antenna comprises: the first coil is connected with the processing module;
the first coil surrounds the second antenna, and the first coil and the second antenna are arranged at intervals.
3. Near field communication device according to claim 1, characterized in that the second antenna comprises: and the second coil is connected with the processing module.
4. Near field communication device according to claim 1, characterized in that a magnetic structure is provided between the first antenna and the second antenna;
the magnetic structure is annular, and the magnetic structure surrounds the second antenna.
5. Near field communication device according to any of claims 1 to 4, characterized in that the processing module comprises:
the first antenna is connected with the driving circuit, and emits a radio frequency signal under the action of a driving signal of the driving circuit;
the second antenna is connected with the detection circuit and transmits the received electric signal to the detection circuit.
6. The near field communication device of claim 5, wherein the detection circuit comprises: an analog-to-digital converter;
the analog-to-digital converter is connected with the second antenna.
7. The near field communication device of claim 5, wherein the processing module further comprises:
the processor is respectively connected with the driving circuit and the detection circuit;
the processor outputs a control signal to the driving circuit, and the driving circuit outputs the driving signal to the first antenna under the action of the control signal; and the detection circuit collects the voltage value of the electric signal and transmits the voltage value to the processor.
8. An electronic device characterized by comprising a near field communication apparatus as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122637503.8U CN215990792U (en) | 2021-10-29 | 2021-10-29 | Near field communication device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122637503.8U CN215990792U (en) | 2021-10-29 | 2021-10-29 | Near field communication device and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN215990792U true CN215990792U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122637503.8U Active CN215990792U (en) | 2021-10-29 | 2021-10-29 | Near field communication device and electronic equipment |
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|---|---|
| CN (1) | CN215990792U (en) |
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2021
- 2021-10-29 CN CN202122637503.8U patent/CN215990792U/en active Active
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