NFC and RFID coil multiplexing control system and terminal

Abstract

The utility model discloses an NFC (Near Field Communication) and RFID (Radio Frequency Identification) coil multiplexing control system and a terminal. The NFC and RFID coil multiplexing control system comprises a coil assembly, an NFC module, an RFID module and an MCU (Microprogrammed Control Unit) module, the coil assembly is connected with the RFID module; the NFC module is connected with the coil assembly through the coupling circuit; and the MCU module is respectively connected with the NFC module and the RFID module. According to the NFC and RFID coil multiplexing control system and the terminal, one set of coil is multiplexed by NFC and RFID, so that signal interference between the two sets of coils is avoided, the communication is more stable, the circuit is more concise, and the installation space is saved.

Description

Technical Field

[0001] The utility model relates to an NFC and RFID coil multiplexing control system and a terminal, belonging to the field of communication technologies. Background Art

[0002] At present, with the continuous development of communication technologies, the use of NFC and RFID technologies has been popularized in communication devices. NFC technology is more targeted at the mutual communication of consumer electronic devices, such as access control, public transportation, mobile payment and other fields. RFID is more proficient in long-distance identification and plays a huge role in fields such as production, logistics, tracking, and asset management.

[0003] For example: in the field of intelligent door locks and elevator control systems, especially in the field of intelligent door locks and elevator control systems that are compatible with NFC and RFID, a reasonable layout of the NFC tag coil area and the RFID card swiping coil area is crucial for ensuring the stability and reliability of the device. In the prior art, the NFC tag coil area and the RFID card swiping coil area are usually set at overlapping positions (in the way of nested large and small coils, and the two sets of coils control a certain distance) or at two relatively independent positions, but this only applies to those door lock systems and elevator control fields that have no excessive restrictions on the size of the panel space. Moreover, since both the NFC tag coil and the RFID card swiping coil use a 13.56 MHz radio frequency signal, such a layout will increase the risk of mutual interference between the NFC tag coil and the RFID card swiping coil, resulting in communication failures. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an NFC and RFID coil multiplexing control system and a terminal, which realize the multiplexing of a set of coils for NFC and RFID, thereby avoiding signal interference between the two sets of coils, making the communication more stable, and the circuit more concise, saving the installation space.

[0005] To solve the above technical problem, the technical solution of the utility model is as follows:

[0006] An NFC and RFID coil multiplexing control system, which includes a coil assembly, an NFC module, an RFID module, and an MCU module;

[0007] The coil assembly is connected to the RFID module;

[0008] The NFC module is connected to the coil assembly through a coupling circuit;

[0009] The MCU module is respectively connected to the NFC module and the RFID module.

[0010] Furthermore, the coil assembly adopts a dual-coil mode.

[0011] Furthermore, the coupling circuit includes a first coupling circuit and a second coupling circuit.

[0012] Furthermore, the first input terminal of the NFC module is connected to the coil assembly through the first coupling circuit.

[0013] Furthermore, the first coupling circuit includes a coupling capacitor C1. One end of the coupling capacitor C1 is connected to the first input terminal of the NFC module, and the other end of the coupling capacitor C1 is connected to the coil assembly.

[0014] Furthermore, the second input terminal of the NFC module is connected to the coil assembly through the second coupling circuit.

[0015] Furthermore, the second coupling circuit includes a coupling capacitor C2. One end of the coupling capacitor C2 is connected to the second input terminal of the NFC module, and the other end of the coupling capacitor C2 is connected to the coil assembly.

[0016] A terminal is configured with the NFC and RFID coil multiplexing control system.

[0017] Adopting the above technical solution, the present utility model has the following beneficial effects:

[0018] The present utility model cancels the NFC coil, and connects the RF two ends of the NFC tag in parallel to the RFID coil through a capacitor, realizing the multiplexing of a set of coils for NFC and RFID, thereby avoiding signal interference between the two sets of coils and making the communication more stable. Due to the existence of only one set of coils, when applied in the fields of intelligent door locks and elevator controls, it saves the panel space of the intelligent door locks and elevator controls. At the same time, the NFC tag area and the RFID card swiping area are set at the same position, and the circuit is more concise, also saving the surface space of the shells of the intelligent door locks and elevator controls. The NFC and RFID coil multiplexing control system of the present utility model has strong scalability and can be widely applied to other communication devices that require NFC and RFID functions. Description of the Drawings

[0019] Figure 1 It is a schematic block diagram of an NFC and RFID coil multiplexing control system of the present utility model;

[0020] Figure 2 It is a schematic circuit diagram of an NFC and RFID coil multiplexing control system of the present utility model. Detailed Embodiments

[0021] In order to make the content of the present utility model be more clearly understood, the present utility model will be further described in detail below according to specific embodiments in conjunction with the drawings.

[0022] Embodiment 1

[0023] As Figure 1 shown, this embodiment provides an NFC and RFID coil multiplexing control system, which includes a coil assembly ANT, an NFC module, an RFID module, and an MCU module. The coil assembly in this embodiment adopts a dual-coil mode. The coil assembly ANT is respectively connected to the NFC module and the RFID module, and both the NFC module and the RFID module are connected to the MCU module. This embodiment improves the prior art, avoids interference between the two sets of coils, and at the same time ensures the stability of signal transmission. The specific solution is: cancel the NFC coil, and directly connect the two radio frequency input pins of the NFC module in parallel to the RFID coil assembly ANT after series capacitance, so as to realize the sharing of a set of coils by NFC and RFID, and thus achieve all communication effects of NFC and RFID.

[0024] As Figure 2 shown, the coil assembly ANT in this embodiment is connected to the RFID module and adopts a dual-coil mode. The coil assembly ANT is respectively connected to the first output terminal TX1 and the second output terminal TX2 of the RFID module, and provides resonance through the resonance capacitor C3 and the resonance capacitor C4 respectively.

[0025] As Figure 2 shown, the NFC module in this embodiment is connected to the coil assembly ANT through a coupling circuit, and the coil signal is coupled to the NFC module by the coupling circuit. Since the dual-coil mode is adopted, there are two paths for the coupling circuit, namely the first coupling circuit and the second coupling circuit. The first input terminal NFC1 of the NFC module is connected to the coil assembly ANT through the first coupling circuit. The first coupling circuit includes a coupling capacitor C1. One end of the coupling capacitor C1 is connected to the first input terminal NFC1 of the NFC module, and the other end of the coupling capacitor C1 is connected to the coil assembly ANT. The second input terminal NFC2 of the NFC module is connected to the coil assembly ANT through the second coupling circuit. The second coupling circuit includes a coupling capacitor C2. One end of the coupling capacitor C2 is connected to the second input terminal NFC2 of the NFC module, and the other end of the coupling capacitor C2 is connected to the coil assembly ANT.

[0026] As Figure 2 shown, the RFID card reader chip used in the RFID module in this embodiment has models including but not limited to WS1850S. The NFC tag chip used in the NFC module in this embodiment has models including but not limited to nRF52832. In addition, since the nRF52832 chip integrates the MCU and NFC functions, the MCU control function of the nRF52832 chip can be reused in actual applications, eliminating the separate MCU module, thereby simplifying the hardware circuit structure and being more practical in actual production and manufacturing.

[0027] The working principle of the present utility model is as follows:

[0028] The MCU module communicates with the NFC module and the RFID module in a polling manner. If the RFID module supports the trigger mode, communication can also be carried out in the trigger interrupt mode.

[0029] When communication is achieved between the NFC device and the NFC module through the coil component ANT, the NFC device writes data information to the NFC module. At this time, the MCU module will turn off the RFID function and set the coil pins of the RFID module to the high impedance state.

[0030] When communication is achieved between the RFID card and the RFID module through the coil component ANT, the RFID module reads the information of the RFID card. At this time, the MCU module will turn off the NFC function and set the coil pins of the NFC module to the high impedance state.

[0031] The MCU module determines whether there is a change in the data information in the NFC module and whether the RFID module reads the information of the RFID card.

[0032] If there is new information written by the NFC device in the NFC module (such as an unlocking request message), the MCU module verifies the unlocking request message. After passing the verification, an opening instruction is sent to the subsequent device (such as the smart door lock body).

[0033] If the RFID reader module reads the information of the RFID card, the MCU module verifies the information of the RFID card. After passing the verification, an opening instruction is sent to the subsequent device (such as the smart door lock body).

[0034] Embodiment 2

[0035] This embodiment provides a terminal configured with the NFC and RFID coil multiplexing control system in Embodiment 1.

[0036] The specific embodiments described above further elaborate on the technical problems solved, technical solutions, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A NFC and RFID coil multiplexing control system, characterized in that: It includes coil assembly, NFC module, RFID module and MCU module; The coil assembly is connected to the RFID module; The NFC module is connected to the coil assembly via a coupling circuit; The MCU module is connected to the NFC module and the RFID module respectively.

2. The NFC and RFID coil multiplexing control system according to claim 1, characterized in that: The coil assembly adopts a double coil mode.

3. The NFC and RFID coil multiplexing control system according to claim 1, characterized in that: The coupling circuit includes a first coupling circuit and a second coupling circuit.

4. The NFC and RFID coil multiplexing control system according to claim 3, characterized in that: The first input terminal of the NFC module is connected to the coil assembly through a first coupling circuit.

5. The NFC and RFID coil multiplexing control system according to claim 4, characterized in that: The first coupling circuit includes a coupling capacitor C1, one end of the coupling capacitor C1 is connected to the first input end of the NFC module, and the other end of the coupling capacitor C1 is connected to the coil assembly.

6. The NFC and RFID coil multiplexing control system according to claim 3, characterized in that: The second input terminal of the NFC module is connected to the coil assembly through a second coupling circuit.

7. The NFC and RFID coil multiplexing control system according to claim 6, characterized in that: The second coupling circuit includes a coupling capacitor C2, one end of the coupling capacitor C2 is connected to the second input end of the NFC module, and the other end of the coupling capacitor C2 is connected to the coil assembly.

8. The NFC and RFID coil multiplexing control system according to claim 1, characterized in that: When the NFC module communicates with the NFC device through the coil assembly, the MCU module turns off the RFID function and sets the coil pin of the RFID module to a high impedance state.

9. The NFC and RFID coil multiplexing control system according to claim 1, characterized in that: When the RFID module communicates with the RFID card through the coil assembly, the MCU module turns off the NFC function and sets the coil pin of the NFC module to a high impedance state.

10. A terminal, characterized in that: The terminal is equipped with the NFC and RFID coil multiplexing control system as claimed in any one of claims 1 to 9.

Images