CN216286702U - Card reader - Google Patents
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- CN216286702U CN216286702U CN202122967243.0U CN202122967243U CN216286702U CN 216286702 U CN216286702 U CN 216286702U CN 202122967243 U CN202122967243 U CN 202122967243U CN 216286702 U CN216286702 U CN 216286702U
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- card reading
- reading chip
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Abstract
The utility model relates to a card reader belongs to near field communication field, can promote the reading performance of card reader. A card reader comprising a card reading chip, a plurality of antennas, and a matching and antenna switching circuit connected between the card reading chip and the plurality of antennas, wherein: the card reading chip is used for controlling connection and disconnection between the antenna in the plurality of antennas and the card reading chip by controlling on-off of the matching and antenna switching circuit, and transmitting data to the outside through the connected antenna; the matching and antenna switching circuit is used for connecting the antennas of the plurality of antennas to the card reading chip under the control of the card reading chip and matching the output impedance of the card reading chip with the input impedance of the plurality of antennas.
Description
Technical Field
The present disclosure relates to the field of near field communication, and more particularly, to a card reader.
Background
In the related art, a card reader is equipped with a Near Field Communication (NFC) antenna, as shown in fig. 1. For applications equipped with multiple Radio Frequency Identification (RFID) tags, it is common practice for a reader to employ a large-sized antenna coil so that the antenna coil can cover all RFID tags. However, this approach may reduce the reading performance of the card reader, and an anti-collision mechanism needs to be designed in the card reading chip of the card reader, which increases the complexity of the algorithm.
SUMMERY OF THE UTILITY MODEL
To overcome the problems in the related art, the present disclosure provides a card reader.
According to a first aspect of the embodiments of the present disclosure, there is provided a card reader, including a card reading chip, a plurality of antennas, and a matching and antenna switching circuit connected between the card reading chip and the plurality of antennas, wherein: the card reading chip is used for controlling connection and disconnection between the antenna in the plurality of antennas and the card reading chip by controlling on-off of the matching and antenna switching circuit, and transmitting data to the outside through the connected antenna; the matching and antenna switching circuit is used for connecting the antennas of the plurality of antennas to the card reading chip under the control of the card reading chip and matching the output impedance of the card reading chip with the input impedance of the plurality of antennas.
Optionally, the matching and antenna switching circuit includes a matching circuit and an antenna switching circuit, wherein the card reading chip, the matching circuit, the antenna switching circuit and the plurality of antennas are sequentially connected in series, and the antenna switching circuit includes a plurality of antenna switching channels corresponding to the plurality of antennas one to one.
Optionally, the matching circuit includes a plurality of matching sub-circuits, and the plurality of matching sub-circuits are connected to the plurality of antenna switching channels in a one-to-one correspondence.
Optionally, the matching and antenna switching circuit includes a matching circuit and an antenna switching circuit, and the card reading chip, the antenna switching circuit, the matching circuit, and the plurality of antennas are sequentially connected in series, where: the antenna switching circuit comprises a plurality of antenna switching channels, the matching circuit comprises a plurality of matching sub-circuits, the antenna switching channels are connected with the matching sub-circuits in a one-to-one correspondence mode, and the matching sub-circuits are connected with the antennas in a one-to-one correspondence mode.
Optionally, the matching and antenna switching circuit connects the antennas of the plurality of antennas to the card reading chip one by one under the control of the card reading chip.
Optionally, the matching and antenna switching circuit connects the antennas of the plurality of antennas to the card reading chip one by one under the control of the card reading chip.
Optionally, the antenna switching circuit is a multiplexer.
Optionally, the size of each antenna of the plurality of antennas matches the size of a tag antenna of the RFID tag.
Optionally, the number of antennas in the plurality of antennas is the same as the number of RFID tags in an application in which the RFID tags are used.
Optionally, the card reading chip is one of a single chip microcomputer, a field programmable gate array and a microprocessor.
By adopting the technical scheme, the card reader is provided with the plurality of antennas, and the card reading chip can control the connection and disconnection between the antennas in the plurality of antennas and the card reading chip by controlling the on-off of the matching and antenna switching circuit, so that each antenna in the plurality of antennas can communicate with the corresponding RFID tag, and thus, the communication between each RFID tag and the card reader in the application with the plurality of RFID tags can be realized without large-size antennas and anti-collision complex algorithms, the card reading performance of the card reader is improved, and the complexity of the reading and writing algorithms of the card reader can not be increased.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a block diagram of a card reader according to the prior art.
FIG. 2 is a block diagram illustrating a card reader according to an example embodiment.
FIG. 3 is a block diagram illustrating yet another card reader according to an example embodiment.
FIG. 4 is a block diagram illustrating yet another card reader according to an example embodiment.
FIG. 5 is a block diagram illustrating yet another card reader according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
FIG. 2 is a block diagram illustrating a card reader according to an example embodiment. The card reader can be applied to any equipment needing NFC communication, such as a mobile phone, a tablet personal computer and the like, so as to realize the functions of mobile payment, electronic ticketing, entrance guard, mobile identity recognition, anti-counterfeiting and the like. The reader is adapted to communicate with an application having a plurality of RFID tags, each of which includes a respective tag chip and tag antenna, as shown in fig. 2. The applications of having a plurality of RFID labels are various, and one example is a water purifier, and this water purifier is furnished with a plurality of filter cores, is furnished with corresponding RFID label on every filter core, needs to read the label data on a plurality of filter cores once and carries out anti-fake inquiry.
Referring to FIG. 2, a card reader 100 according to one embodiment of the present disclosure includes a card reading chip 21, a plurality of antennas 22, and a matching and antenna switching circuit 23, wherein the matching and antenna switching circuit 23 is connected between the card reading chip 21 and the plurality of antennas 22.
And the card reading chip 21 is used for controlling connection and disconnection between the antenna in the plurality of antennas 22 and the card reading chip 21 by controlling on and off of the matching and antenna switching circuit 23, and transmitting data to the outside through the connected antenna.
The card reading chip 21 can control the on-off of the matching and antenna switching circuit 23 according to the preset antenna connection logic.
For example, the card reading chip 21 may control the matching and antenna switching circuit 23 to connect the antennas of the plurality of antennas 22 to the card reading chip 21 one by one. For example, assuming that the plurality of antennas 22 includes N antennas, then: the card reading chip 21 may first control the matching and antenna switching circuit 23 to connect only a first antenna of the N antennas to the card reading chip and the remaining antennas are not connected to the card reading chip 21, after the card reading chip 21 completes communication with the corresponding RFID tag through the connected first antenna (e.g., reads data in the corresponding RFID tag, writes data to the corresponding RFID tag, etc.), the card reading chip 21 may then control the matching and antenna switching circuit 23 to connect only a second antenna of the N antennas to the card reading chip and the remaining antennas are not connected to the card reading chip 21, after the card reading chip 21 completes communication with the corresponding RFID tag through the connected second antenna (e.g., reads data in the corresponding RFID tag, writes data to the corresponding RFID tag, etc.), the card reading chip 21 may then control the matching and antenna switching circuit 23 to connect only a third antenna of the N antennas to the card reading chip and the remaining antennas are not connected to the card reading chip Connect to the card reading chip 21 and so on until communication with all the corresponding RFID tags is completed.
For another example, the card reading chip 21 may control the matching and antenna switching circuit 23 to connect the antennas of the plurality of antennas 22 to the card reading chip 21 one by one, for example, to connect at least two antennas to the card reading chip 21 at one time. For example, assuming that the plurality of antennas 22 includes N antennas, then: the card reading chip 21 may first control the matching and antenna switching circuit 23 to connect only the first antenna and the second antenna of the N antennas to the card reading chip and the remaining antennas are not connected to the card reading chip 21, after the card reading chip 21 completes communication with the corresponding RFID tag through the connected first antenna and second antenna (e.g., reads data in the corresponding RFID tag, writes data to the corresponding RFID tag, etc.), the card reading chip 21 may then control the matching and antenna switching circuit 23 to connect only the third antenna and the fourth antenna of the N antennas to the card reading chip and the remaining antennas are not connected to the card reading chip 21, after the card reading chip 21 completes communication with the corresponding RFID tag through the connected third antenna and fourth antenna (e.g., reads data in the corresponding RFID tag, writes data to the corresponding RFID tag, etc.), the card reading chip 21 may then control the matching and antenna switching circuit 23 to connect only the fifth and sixth antennas of the N antennas to the card reading chip and the remaining antennas are not connected to the card reading chip 21, and so on, until the communication with all the corresponding RFID tags is completed.
The card reading chip 21 can be implemented by any type of processor, for example, one of a single chip, a field programmable gate array, a microprocessor, and the like can be used.
A matching and antenna switching circuit 23 for connecting an antenna of the plurality of antennas 22 to the card reading chip 21 under the control of the card reading chip 21 and for matching an output impedance of the card reading chip 21 with an input impedance of the plurality of antennas 22. By performing impedance matching, impedance continuity between the output impedance of the card reading chip 21 and the input impedance of the plurality of antennas 22 can be ensured, and the card reading performance of the card reader can be ensured.
The size of each antenna in the plurality of antennas 22 may be matched with the size of the tag antenna of the corresponding RFID tag, so as to ensure matching between the antennas, ensure communication capability of the antennas, and improve the card reading performance of the card reader.
In addition, the number of antennas in the plurality of antennas 22 is the same as the number of RFID tags in an application in which the RFID tags are used, which ensures that each RFID tag in the application has a reader antenna corresponding thereto.
By adopting the above technical scheme, since the card reader 100 has the plurality of antennas 22, and the card reading chip 21 can control the connection and disconnection between the antennas of the plurality of antennas 22 and the card reading chip 21 by controlling the on-off of the matching and antenna switching circuit 23, each antenna of the plurality of antennas 22 can communicate with the corresponding RFID tag, thus, the communication between each RFID tag in the application having the plurality of RFID tags and the card reader 100 can be realized without a large-sized antenna and an anti-collision complex algorithm, the card reading performance of the card reader is improved, and the complexity of the read-write algorithm of the card reader is not increased.
FIG. 3 is a block diagram illustrating yet another card reader according to an example embodiment. As shown in fig. 3, the matching and antenna switching circuit 23 includes a matching circuit 231 and an antenna switching circuit 232, wherein the card reading chip 21, the matching circuit 231, the antenna switching circuit 232 and the plurality of antennas 22 are connected in series in sequence, and the antenna switching circuit 232 includes a plurality of antenna switching channels 232 corresponding to the plurality of antennas 22 one to one1～232N。
The card reading chip 21 can switch the channel 232 by controlling each antenna1～232NTo control the connection of each of the plurality of antennas 22 to the card reading chip 21.
By adopting the technical scheme, the channel 232 can be switched by controlling each antenna1～232NTo control the connection between each antenna of the plurality of antennas 22 and the card reading chip 21, so as to realize the reading and writing of the corresponding RFID tag.
FIG. 4 is a block diagram illustrating yet another card reader according to an example embodiment. As shown in fig. 4, on the basis of fig. 3, the matching circuit 231 may comprise a plurality of matching sub-circuits 2311～231NA plurality of matching sub-circuits 2311～231NAnd a plurality of antenna switching channels 2321～232NAre connected in a one-to-one correspondence.
By adopting the technical scheme, aiming at each path of data transmission channel, a matching subcircuit is arranged to match the input impedance of the antenna with the output impedance of the card reading chip 21, so that each path of data transmission channel can perform data transmission with the best performance.
FIG. 5 is a block diagram illustrating yet another card reader according to an example embodiment. As shown in fig. 5, the matching and antennaThe switching circuit 23 includes a matching circuit 231 and an antenna switching circuit 232, wherein the card reading chip 21, the antenna switching circuit 232, the matching circuit 231 and the plurality of antennas 22 are sequentially connected in series, wherein: the antenna switching circuit 232 includes a plurality of antenna switching channels 2321～232NThe matching circuit 231 includes a plurality of matching sub-circuits 2311～231NAnd antenna switching channel 2321～232NAnd matching sub-circuit 2311～231NConnected in one-to-one correspondence, matching sub-circuits 2311～231NAre connected in one-to-one correspondence with the plurality of antennas 22.
By adopting the technical scheme, the channel 232 can be switched by controlling each antenna1～232NTo control the connection between each antenna of the plurality of antennas 22 and the card reading chip 21, so as to realize the reading and writing of the corresponding RFID tag.
In some embodiments, the antenna switching circuit 232 described above may be a multiplexer. Of course, it is also possible to use separate switches for each antenna switching channel of the antenna switching circuit 232. For example, each antenna switching channel may be implemented using a semiconductor switch.
The working principle of the card reader 100 according to the embodiment of the present disclosure to read data in the RFID tag is: when the reader 100 is powered up, the reader 100 approaches an RFID tag to read information in the RFID tag, the card reading chip 21 controls the matching and antenna switching circuit 23 to connect the antennas of the plurality of antennas 22 to the card reading chip 21 according to the preset antenna connection logic, the antennas connected to the card reading chip 21 generate a radio frequency field, transmit initial information through a transmission speed, after the card reading chip 21 recognizes the ID of the corresponding RFID tag through the connected antenna, the card reading chip 21 performs authentication (e.g., key authentication) with the corresponding RFID tag, and after the authentication is successful, the corresponding RFID tag transmits data in the tag to the reader 100 at the same speed using a load modulation technique (e.g., an amplitude shift keying modulation technique, a frequency shift keying modulation technique, etc.), the antenna connected to the card reading chip 21 receives the data of the corresponding RFID tag and transmits the data to the card reading chip 21. Then, the card reading chip 21 is switched to be connected with the next antenna according to the preset antenna connection logic, and the data of the RFID tag corresponding to the next antenna is read through the process described above, and so on until the data reading of all the RFID tags is completed.
The working principle of the card reader 100 writing data into the RFID tag according to the embodiment of the present disclosure is similar to the reading process described above, except that the reading operation is replaced by the writing operation, and thus, the description is omitted.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A card reader, comprising a card reading chip, a plurality of antennas and a matching and antenna switching circuit, the matching and antenna switching circuit being connected between the card reading chip and the plurality of antennas, wherein:
the card reading chip is used for controlling connection and disconnection between the antenna in the plurality of antennas and the card reading chip by controlling on-off of the matching and antenna switching circuit, and transmitting data to the outside through the connected antenna;
the matching and antenna switching circuit is used for connecting the antennas of the plurality of antennas to the card reading chip under the control of the card reading chip and matching the output impedance of the card reading chip with the input impedance of the plurality of antennas.
2. The card reader according to claim 1, wherein the matching and antenna switching circuit comprises a matching circuit and an antenna switching circuit, wherein the card reading chip, the matching circuit, the antenna switching circuit and the plurality of antennas are sequentially connected in series, and the antenna switching circuit comprises a plurality of antenna switching channels corresponding to the plurality of antennas one to one.
3. The card reader of claim 2, wherein the matching circuit comprises a plurality of matching sub-circuits connected in one-to-one correspondence with the plurality of antenna switching channels.
4. The card reader according to claim 1, wherein the matching and antenna switching circuit comprises a matching circuit and an antenna switching circuit, and the card reading chip, the antenna switching circuit, the matching circuit and the plurality of antennas are connected in series in sequence, wherein:
the antenna switching circuit comprises a plurality of antenna switching channels, the matching circuit comprises a plurality of matching sub-circuits, the antenna switching channels are connected with the matching sub-circuits in a one-to-one correspondence mode, and the matching sub-circuits are connected with the antennas in a one-to-one correspondence mode.
5. The card reader according to any one of claims 1 to 4, wherein the matching and antenna switching circuit connects the antennas of the plurality of antennas one by one to the card reading chip one by one under control of the card reading chip.
6. The card reader according to any of claims 1 to 4, wherein the matching and antenna switching circuit connects antennas of the plurality of antennas to the card reading chip one by one under control of the card reading chip.
7. The card reader according to any of claims 2 to 4, wherein the antenna switching circuit is a multiplexer.
8. The reader according to any one of claims 1 to 4, wherein the size of each antenna of the plurality of antennas matches the size of a tag antenna of an RFID tag.
9. The reader according to any one of claims 1 to 4, wherein the number of antennas in the plurality of antennas is the same as the number of RFID tags in an application in which the RFID tags are used.
10. The card reader according to any one of claims 1 to 4, wherein the card reading chip is one of a single chip microcomputer, a field programmable gate array, and a microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122967243.0U CN216286702U (en) | 2021-11-29 | 2021-11-29 | Card reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122967243.0U CN216286702U (en) | 2021-11-29 | 2021-11-29 | Card reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216286702U true CN216286702U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122967243.0U Active CN216286702U (en) | 2021-11-29 | 2021-11-29 | Card reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216286702U (en) |
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2021
- 2021-11-29 CN CN202122967243.0U patent/CN216286702U/en active Active
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