Near field wireless communication system and method for magnetic drive conveying line

Abstract

The application relates to a near-field wireless communication system and method applied to a magnetic drive conveying line. The system comprises a transmitting end and a receiving end; the transmitting end comprises a main controller, a transmitting-end near-field communication chip, a radio frequency switch, a transmitting-end antenna tuning circuit, a top layer and a bottom layer of transmitting antennas, the top layer and the bottom layer of transmitting antennas are overlapped and laid on the top layer and the bottom layer of a stator printed circuit board to cover the horizontal axis direction, each transmitting antenna is connected with the transmitting-end antenna tuning circuit, the radio frequency switch is connected with the transmitting-end antenna tuning circuit and the transmitting-end near-field communication chip, and the main controller is connected with the radio frequency switch and the transmitting-end near-field communication chip; the receiving end comprises at least one receiving unit synchronously moved with a follower, the receiving unit comprises a sub-controller, a receiving-unit near-field communication chip, a receiving-unit antenna tuning circuit and a receiving antenna, the receiving antenna is connected with the receiving-unit antenna tuning circuit and corresponds to the top layer or the bottom layer of transmitting antennas one by one, and the system can improve the operation efficiency of the magnetic drive conveying line.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a near-field wireless communication system and method for use in magnetic drive conveyor lines. Background Technology

[0002] With the rapid development of technologies in intelligent manufacturing and automated logistics, moving-magnetic drive conveyor lines have become core conveying equipment in scenarios such as electronic assembly, food sorting, and precision component transfer due to their characteristics such as fixed stator coils (on-demand excitation on the track side), permanent magnets mounted on the mover (passive design), high transmission accuracy, low noise, and flexible layout. They drive the mover through the electromagnetic interaction between the magnetic field generated by the energized stator coils and the permanent magnets on the mover side, eliminating the need for active power supply to the mover and offering advantages over traditional conveying equipment in terms of lightweight design and low maintenance requirements.

[0003] Currently, signal interaction between the stator and mover in moving-magnet drive conveyor lines still largely relies on wired connections. However, these wired solutions suffer from drawbacks such as easy aging and failure of the drag chain, limitations on the mover's range of motion, and complex wiring in multi-motor scenarios. Therefore, achieving wireless signal and energy transmission between the passive mover and mover in moving-magnet drive conveyor lines has become an urgent technical problem to be solved. However, existing solutions consistently fail to meet the requirements, exhibiting issues such as signal blind spots at stator segment coil connections, inability to achieve uninterrupted signal transmission, and susceptibility to signal mistransmission and missed transmission, failing to meet the signal differentiation requirements in multi-motor parallel scenarios. Summary of the Invention

[0004] Therefore, it is necessary to provide a near-field wireless communication system and method for magnetic drive conveyor lines to address the aforementioned technical problems.

[0005] A near-field wireless communication system for use in magnetic drive conveyor lines, the system comprising: Transmitter and receiver; The transmitter includes a main controller, a transmitter near-field communication chip, an RF switch, a transmitter antenna tuning circuit, a top-level transmitting antenna, and a bottom-level transmitting antenna. The top-level transmitting antenna and the bottom-level transmitting antenna are respectively laid overlapping on the top and bottom layers of the stator's printed circuit board so that the communication signal covers the horizontal axis of the printed circuit board. Each transmitting antenna is connected to the transmitter antenna tuning circuit. The RF switch is connected to both the transmitter antenna tuning circuit and the transmitter near-field communication chip. The main controller is connected to both the RF switch and the transmitter near-field communication chip. The receiving end includes at least one receiving unit. The receiving unit moves synchronously with the mover of the magnetic drive conveyor line. It includes a sub-controller, a receiving unit near-field communication chip, a receiving unit antenna tuning circuit, and a receiving antenna. The receiving antenna is connected to the receiving unit antenna tuning circuit and corresponds one-to-one with the top-level transmitting antenna or the bottom-level transmitting antenna. The receiving unit near-field communication chip is connected to the sub-controller and the receiving unit antenna tuning circuit respectively. The main controller is used to control the radio frequency switch to switch the transmission path of the transmission signal according to the position of the receiving unit, and only the non-overlapping transmission antennas are in working state at the same time. The sub-controller is used to control the signal processing flow of the near-field communication chip of the receiving unit based on the handshake verification result of the received signal.

[0006] A near-field wireless communication method for use in magnetic drive conveyor lines, the method comprising: After the transmitter is started, the main controller controls the RF switch to switch the transmission path of the transmission signal according to the position of the receiver, so that the top and bottom layer transmitting antennas of the stator printed circuit board are working, and only the non-overlapping transmitting antennas are working at the same time; each transmitting antenna is connected to the RF switch through the corresponding transmitter antenna tuning circuit, and the RF switch works with the transmitter near-field communication chip to realize signal transmission. In the receiving end, which moves synchronously with the mover of the magnetic drive conveyor line, the sub-controller of the receiving unit controls the near-field communication chip of the receiving unit to process the signal sensed by the receiving antenna according to the handshake verification result of the received signal; the receiving antenna corresponds one-to-one with the top-level transmitting antenna or the bottom-level transmitting antenna, and is connected to the near-field communication chip of the receiving unit through the antenna tuning circuit of the receiving unit. Near-field wireless communication between the stator and mover in a magnetic drive conveyor line is achieved through the coordinated interaction of the transmitter and receiver.

[0007] The aforementioned near-field wireless communication system and method applied to magnetic drive conveyor lines effectively improves the communication performance of magnetic drive conveyor lines through the collaboration between the stator-side transmitter and the receiver moving with the mover. The top and bottom layer transmitting antennas of the transmitter are overlapped, covering the horizontal axis of the track. The main controller switches the transmission path according to the position of the receiving unit, and only non-overlapping transmitting antennas operate at any given time, avoiding signal interference, adapting to the mover's movement path, and ensuring communication continuity. The receiver uses a one-to-one correspondence between the receiving antenna and the transmitting antenna. The sub-controller controls signal processing based on the handshake verification result, ensuring the mover accurately receives the matching signal and reducing confusion. In this embodiment, the mover does not require a wired connection, overcoming the limitations of traditional cables on the mover's range and speed, reducing failures caused by drag chain aging and current collector wear, adapting to complex paths and multi-motor scenarios, and effectively improving equipment operating efficiency. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the transmitter structure in one embodiment; Figure 2 This is a schematic diagram of the receiver structure in one embodiment; Figure 3 This is a schematic diagram of the layout of the core components of a near-field wireless communication system for a magnetic drive conveyor line in one embodiment. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0010] In one embodiment, a near-field wireless communication system for use in a magnetic drive conveyor line is provided, including a transmitter and a receiver; The transmitter includes a main controller, a transmitter near-field communication chip, an RF switch, a transmitter antenna tuning circuit, a top-level transmitting antenna, and a bottom-level transmitting antenna. The top-level and bottom-level transmitting antennas are laid overlapping on the top and bottom layers of the stator's printed circuit board, respectively, so that the communication signal covers the horizontal axis of the printed circuit board. Each transmitting antenna is connected to the transmitter antenna tuning circuit. The RF switch is connected to both the transmitter antenna tuning circuit and the transmitter near-field communication chip. The main controller is connected to both the RF switch and the transmitter near-field communication chip. The receiving end includes at least one receiving unit, which moves synchronously with the mover of the magnetic drive conveyor line. It includes a sub-controller, a near-field communication chip for the receiving unit, an antenna tuning circuit for the receiving unit, and a receiving antenna. The receiving antenna is connected to the antenna tuning circuit for the receiving unit and corresponds one-to-one with the top-level transmitting antenna or the bottom-level transmitting antenna. The near-field communication chip for the receiving unit is connected to the sub-controller and the antenna tuning circuit for the receiving unit, respectively. The main controller is used to control the RF switch to switch the transmission path of the transmission signal according to the position of the receiving unit, and only the non-overlapping transmission antennas are in working state at the same time. The sub-controller is used to control the signal processing flow of the near-field communication chip of the receiving unit based on the handshake verification result of the received signal.

[0011] In the aforementioned near-field wireless communication system applied to magnetic drive conveyor lines, the communication performance of the magnetic drive conveyor line is effectively improved through the collaboration between the stator-side transmitter and the receiver moving with the mover. The top and bottom layer transmitting antennas of the transmitter are laid in an overlapping manner, covering the horizontal axis of the track. The main controller switches the transmission path according to the position of the receiving unit, and only non-overlapping transmitting antennas operate at any given time, avoiding signal interference, adapting to the mover's movement path, and ensuring communication continuity. The receiver uses a one-to-one correspondence between the receiving antenna and the transmitting antenna. The sub-controller controls signal processing based on the handshake verification result, ensuring that the mover accurately receives the matching signal and reducing confusion. In this embodiment of the invention, the mover does not require a wired connection, breaking through the limitations of traditional cables on the mover's range and speed, reducing failures caused by drag chain aging and current collector wear, adapting to complex paths and multi-motor scenarios, and effectively improving equipment operating efficiency.

[0012] In one embodiment, the overlapping laying of the top-level transmitting antenna and the bottom-level transmitting antenna on the top and bottom layers of the stator's printed circuit board includes: multiple sets of top-level transmitting antennas are laid at predetermined distances along the horizontal axis on the top layer of the printed circuit board, and multiple sets of bottom-level transmitting antennas are laid in a positional overlapping relationship with the top-level transmitting antennas along the horizontal axis on the bottom layer of the printed circuit board, and there is no electromagnetic field overlap area between any set of top-level transmitting antennas and bottom-level transmitting antennas in space.

[0013] In this embodiment, the layered and overlapping arrangement of the top and bottom layer transmitting antennas provides stable and reliable near-field wireless communication for the entire process of moving parts transport. When the moving parts move along the conveyor track (corresponding to the horizontal axis of the PCB), regardless of whether they are in a starting, accelerating, changing track, or decelerating state, signal reception will not be interrupted due to antenna spacing, ensuring smooth communication between the moving parts and the stator. This is crucial for key aspects of magnetic drive conveyor lines, such as precise material transfer and multi-moving part collaborative operation. For example, in a magnetic drive conveyor line for assembling electronic components, moving parts carrying precision components need to move precisely between different workstations and interact with the stator in real time with assembly instructions. This arrangement ensures that the signal remains stable during workstation switching (corresponding to antenna coverage area switching), preventing assembly errors due to communication problems. Specifically, on the top layer of the PCB, four sets of top-layer transmitting antennas (Antenna-T1~T4) are laid at preset intervals along the horizontal axis. The length of each antenna set is adapted to the horizontal axis dimension of the PCB, and the edge spacing of adjacent antennas remains consistent. On the bottom layer of the PCB, four sets of bottom-layer transmitting antennas (Antenna-B1~B4) are laid along the horizontal axis, and the projection position of each bottom-layer transmitting antenna overlaps with that of the top-layer transmitting antennas. For example, the projection of Antenna-B1 covers the interval between Antenna-T1 and Antenna-T2, the projection of Antenna-B2 covers the interval between Antenna-T2 and Antenna-T3, and so on. Simultaneously, the antenna size and laying height are optimized through simulation to ensure that the electromagnetic field coverage of any set of top-layer and bottom-layer transmitting antennas does not overlap, avoiding signal coupling between antennas on different layers. It should be noted that the number of sets of top-layer and bottom-layer transmitting antennas is not limited to four; six, eight, etc., are also acceptable. The specific number is determined based on the actual application requirements to achieve full coverage of the PCB horizontal axis and meet the requirement of no electromagnetic field overlap.

[0014] In one embodiment, controlling the RF switch to switch the transmission path of the transmission signal according to the position of the receiving unit includes: when multiple receiving units are within the coverage area of ​​adjacent overlapping transmitting antennas, the main controller generates a clock signal with a preset period through a built-in timer, and outputs a first control command to the RF switch according to the clock signal; the RF switch selects all top-level transmitting antennas or all bottom-level transmitting antennas in the first period according to the first control command, and selects the transmitting antennas that were not selected in the previous period in the second period, with the first period and the second period having the same duration.

[0015] In this embodiment, polling logic ensures precise and controllable antenna switching timing, meeting the real-time requirements of near-field communication. Simultaneously, the design of grounding non-working antennas during single-cycle, single-layer operation completely avoids signal interference between antennas on different layers within the same cycle. Combined with the non-overlapping electromagnetic field structure of the previous embodiment, this further reduces the system interference rate. The main controller (using an MCU) generates a clock signal with a period T (the preset period can be dynamically adjusted by the program) through a built-in timer. Based on this clock signal, it outputs high and low level control commands to the single-pole multi-throw RF switch. When the clock signal is high (first cycle), the main controller outputs a "01" level signal, controlling the RF switch to select the path of all top-layer transmitting antennas (such as Antenna-T1~T4), while grounding the bottom-layer transmitting antennas. When the clock signal is low (second cycle), the main controller outputs a "10" level signal, controlling the RF switch to switch to the path of all bottom-layer transmitting antennas (Antenna-B1~B4), while grounding the top-layer transmitting antenna, thus achieving alternating polling of the top and bottom-layer antenna groups.

[0016] In one embodiment, controlling the RF switch to switch the transmission path of the transmission signal according to the location of the receiving unit includes: when multiple receiving units are within the coverage area of ​​non-adjacent overlapping transmitting antennas, or when only a single receiving unit exists, the main controller outputs a second control command to the RF switch, causing the RF switch to simultaneously select the transmitting antenna corresponding to each receiving unit.

[0017] In this embodiment, this control method can flexibly adjust the operating state of the transmitting antenna according to the actual distribution of the receiving units. When a receiving unit is in a non-adjacent overlapping area or exists only once, the corresponding transmitting antenna is synchronously selected, which can improve the communication efficiency of multiple movers operating in a dispersed manner or a single mover operating in the magnetic drive conveyor line, reduce communication waiting time, and allow the movers to conduct near-field wireless communication with the stator more efficiently, adapting to the diverse operating scenarios of the magnetic drive conveyor line. Specifically, the main controller obtains the position information of the receiving units in real time. When it is determined that multiple receiving units are in the coverage area of ​​non-adjacent overlapping transmitting antennas, or that only a single receiving unit exists, a second control command is generated and sent to the RF switch. According to the command, the RF switch simultaneously connects the path of the transmitting antenna corresponding to these receiving units, so that the transmitting antennas work synchronously.

[0018] In one embodiment, based on the handshake verification result of the received signal, the signal processing flow of the near-field communication chip of the receiving unit includes: the sub-controller acquires the signal from the transmitting end through the receiving antenna and verifies the handshake identifier in the signal; if the verification is successful, the sub-controller controls the near-field communication chip of the receiving unit to switch the signal demodulation parameters, adjust the receiving gain, and start the signal acquisition and decoding process of the receiving antenna path corresponding to the currently working antenna group. In this embodiment, it can be ensured that the receiving unit (synchronously moving with the mover) only responds to the transmitting end signal that matches itself, avoiding signal confusion caused by the alternating operation of multiple sets of transmitting antennas on the track or the parallel operation of multiple movers. This allows the mover to accurately receive control commands and data from the stator side even when moving at high speed along the track and frequently switching communication areas. At the same time, by switching demodulation parameters and adjusting the receiving gain in real time, it can adapt to the signal strength differences of transmitting antennas at different positions (such as the signal attenuation differences between the two ends of the track and the middle area), ensuring the accuracy of signal decoding. This provides stable communication support for the precise positioning of material transmission and the coordinated scheduling of multiple movers in the magnetic drive conveyor line, reducing conveying delays or positioning deviations caused by signal misreading.

[0019] Specifically, the sub-controller of the receiving unit presets a unique handshake identifier (such as a carrier signal of a specific frequency or a dedicated digital code) that matches the corresponding mover. When the mover moves along the magnetic drive conveyor track, the receiving antenna captures the signals of the surrounding transmitting antennas in real time and transmits them to the sub-controller. The sub-controller extracts the handshake identifier in the signal and compares it with the preset identifier (such as by using logic gate circuits or embedded programs to complete the identifier verification). If the verification results are consistent (verification passed), the sub-controller immediately outputs a control signal to the near-field communication chip of the receiving unit. At the same time, it activates the receiving antenna path corresponding to the currently working transmitting antenna through the gating circuit, samples the signal, and converts the sampled data into control commands or data information sent by the stator side, completing a complete signal processing flow.

[0020] In one embodiment, the near-field communication chip of the transmitting end and the near-field communication chip of the receiving unit have a simulated front-end function, which is used to skip redundant protocol steps.

[0021] In this embodiment, both the near-field communication chips at the transmitting and receiving ends enable the analog front-end (AFE) function. At the transmitting end, the AFE function skips the redundant steps of field detection, initialization, and handshake in the traditional NFC protocol, and directly enters the signal modulation and transmission state, which greatly shortens the time from chip startup to stable transmission, achieving a stabilization time at the microsecond level.

[0022] In one embodiment, the RF switch is a single-pole multi-throw (SPMD) RF switch. The main controller outputs high and low level signals to the control terminal of the SPMD RF switch to achieve the selection control of different transmitting antenna paths.

[0023] In one embodiment, the receiving unit antenna tuning circuit is used to adjust the impedance of the receiving antenna so that the impedance of the receiving antenna matches that of the receiving unit near-field communication chip.

[0024] In one embodiment, the near-field communication chip at the transmitter is connected to a top-level transmitting antenna and a bottom-level transmitting antenna respectively via an RF switch.

[0025] In this embodiment, the transmitter is equipped with two near-field communication (NFC) chips. Each chip is connected to one set of top-level transmitting antennas and one set of bottom-level transmitting antennas. For example, chip 1 connects to Antenna-T1 (top level) and Antenna-B1 (bottom level), chip 2 connects to Antenna-T2 (top level) and Antenna-B2 (bottom level), chip 3 connects to Antenna-T3 (top level) and Antenna-B3 (bottom level), and chip 4 connects to Antenna-T4 (top level) and Antenna-B4 (bottom level). The main controller independently controls the four chips. During polling, chips at the same level start synchronously, driving the corresponding antennas to transmit signals. It should be noted that the number of NFC chips and the number of antenna sets connected to each chip are not limited to the above settings. The specific number depends on the actual application to achieve antenna load balancing and stable system operation.

[0026] In one embodiment, such as Figure 1 The diagram shows a schematic representation of a transmitter end. Figure 1 In this design, the antennas are positioned within the Wireless Communication Region. Antenna_1 to Antenna_4 are laid out in an overlapping pattern on the top and bottom layers of the PCB board to cover any position along the horizontal axis of the PCB. Each antenna is connected to an Antenna Tuning Circuit and is controlled by an RF switch with a 50Ω resistor. Only non-overlapping antennas are active at a time (e.g., Antenna_1 and Antenna_3 are active in the first stage, and Antenna_2 and Antenna_4 are active in the second stage) to avoid coupling interference. NFC IC_1 and NFC IC_2 have analog front-end (AFE) functionality, which can skip redundant protocol detection, shortening the settling time to the microsecond level to meet real-time requirements. The MCU (microcontroller) acts as the main controller, coordinating the entire transmitter's operation to ensure efficient and stable antenna polling switching and communication.

[0027] In one embodiment, such as Figure 2The diagram shown illustrates the structure of a receiver end. Figure 1 The internal components and connections of four receivers (receiver end1 - receiver end4) are shown. Each receiver has four sub-MCUs (MCU_1~MCU_4) and one NFCIC (NFCIC_5~NFCIC_8). The sub-MCUs are responsible for local control of the receiver, and the NFCICs pair with the transmitter NFCICs to achieve near-field communication. Each receiver is equipped with one receiving antenna (Antenna_5~Antenna_8) and one AntennaTuningCircuit. The antennas are matched with the transmitters Antenna_1~Antenna_4 to ensure stable signal reception.

[0028] In one embodiment, a near-field wireless communication method for use in a magnetic drive conveyor line is provided, comprising the following steps: After the transmitter is started, the main controller controls the RF switch to switch the transmission path of the transmission signal according to the position of the receiver, so that the top and bottom layer transmitting antennas of the stator printed circuit board are working, and only the non-overlapping transmitting antennas are working at the same time; each transmitting antenna is connected to the RF switch through the corresponding transmitter antenna tuning circuit, and the RF switch works with the transmitter near-field communication chip to realize signal transmission. In the receiving end, which moves synchronously with the mover of the magnetic drive conveyor line, the sub-controller of the receiving unit controls the near-field communication chip of the receiving unit to process the signal sensed by the receiving antenna according to the handshake verification result of the received signal; the receiving antenna corresponds one-to-one with the top-level transmitting antenna or the bottom-level transmitting antenna, and is connected to the near-field communication chip of the receiving unit through the antenna tuning circuit of the receiving unit. Near-field wireless communication between the stator and mover in a magnetic drive conveyor line is achieved through the coordinated interaction of the transmitter and receiver.

[0029] Specifically, interference-free near-field communication across the entire area is achieved through the following implementation methods: 1. After the system is powered on, the main MCU of the transmitter starts up and initializes NFCIC_1, NFCIC_2 and SPDT RF switch. Each sub-MCU of the receiver initializes the corresponding NFCIC_5~NFCIC_8. The antenna tuning circuit automatically completes signal matching calibration.

[0030] 2. The main MCU sends a control signal to the SPDT RF switch to open the paths between Antenna_1, Antenna_3 and NFCIC_1, NFCIC_2, while simultaneously closing Antenna_2 and Antenna_4 (grounding them) to prevent coupling interference caused by overlapping antennas (such as Antenna_1 and Antenna_2) operating simultaneously. NFCIC_1 and NFCIC_2 enable the AFE function, using Antenna_1 and Antenna_3 as signal sources / loads to establish near-field communication with the receiving end Antenna_5 and Antenna_7 (corresponding matched transmitting antennas) to complete data transmission (such as sensor data, control commands, etc.).

[0031] 3. After the first stage of data transmission is completed, the main MCU sends a switching signal to close the path between Antenna_1, Antenna_3 and NFCIC, while opening the path between Antenna_2, Antenna_4 and NFCIC_1, NFCIC_2. NFCIC_1 and NFCIC_2 switch the load / source to Antenna_2 and Antenna_4, and continue to quickly stabilize through the AFE function to establish communication with the receiving end Antenna_6 and Antenna_8, completing a new round of data transmission.

[0032] 4. Repeat steps 2-3. The main MCU controls the RF switch to periodically switch the antennas, so that Antenna_1~Antenna_4 are polled and working in turn, ensuring that any position in the horizontal direction of the PCB board can be covered by at least one working antenna, so as to realize uninterrupted point-to-point near-field communication in the whole area.

[0033] In one embodiment, such as Figure 3 As shown, a schematic diagram of the core component layout of a near-field wireless communication system for a magnetic drive conveyor line is provided. Figure 3 As shown, the bottom layer is a wireless transmitting module, which generates and outputs radio frequency signals as a signal source. Above it is a ferrite board, which serves as a magnetic shield and guides the magnetic field, reducing magnetic field leakage and guiding the magnetic field upward. The next layer is a coil board with multiple sets of overlapping transmitting coils, which radiate the radio frequency signals in the form of a near-field magnetic field, covering the horizontal axis of the conveyor track to adapt to the movement of the mover. The topmost coil receiving board is the receiving end on the mover side. The board has receiving coils that correspond one-to-one with the transmitting coils, which can sense the magnetic field signal and convert it into an electrical signal, thereby realizing near-field wireless communication between the mover and the stator.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A near-field wireless communication system for use in magnetic drive conveyor lines, characterized in that, The system includes a transmitter and a receiver; The transmitter includes a main controller, a transmitter near-field communication chip, an RF switch, a transmitter antenna tuning circuit, a top-level transmitting antenna, and a bottom-level transmitting antenna. The top-level transmitting antenna is laid on the top layer of the stator's printed circuit board, and the bottom-level transmitting antenna is laid on the bottom layer of the stator's printed circuit board. The top-level transmitting antenna and the bottom-level transmitting antenna are in an overlapping position so that the communication signal covers the horizontal axis of the printed circuit board. Each transmitting antenna is connected to the transmitter antenna tuning circuit. The RF switch is connected to both the transmitter antenna tuning circuit and the transmitter near-field communication chip. The main controller is connected to both the RF switch and the transmitter near-field communication chip. The receiving end includes at least one receiving unit. The receiving unit moves synchronously with the mover of the magnetic drive conveyor line. It includes a sub-controller, a receiving unit near-field communication chip, a receiving unit antenna tuning circuit, and a receiving antenna. The receiving antenna is connected to the receiving unit antenna tuning circuit and corresponds one-to-one with the top-level transmitting antenna or the bottom-level transmitting antenna. The receiving unit near-field communication chip is connected to the sub-controller and the receiving unit antenna tuning circuit respectively. The main controller is used to control the radio frequency switch to switch the transmission path of the transmission signal according to the position of the receiving unit, and only the non-overlapping transmission antennas are in working state at the same time. The sub-controller is used to control the signal processing flow of the near-field communication chip of the receiving unit based on the handshake verification result of the received signal.

2. The system according to claim 1, characterized in that, The top-level transmitting antenna is laid on the top layer of the stator's printed circuit board, and the bottom-level transmitting antenna is laid on the bottom layer of the stator's printed circuit board. The top-level transmitting antenna and the bottom-level transmitting antenna are in an overlapping position, including: The top-level transmitting antenna is laid out in multiple sets at predetermined intervals along the horizontal axis on the top layer of the printed circuit board. The bottom-level transmitting antenna is laid out in multiple sets along the horizontal axis on the bottom layer of the printed circuit board, overlapping with the top-level transmitting antenna. Furthermore, there is no electromagnetic field overlap area between any set of top-level transmitting antennas and bottom-level transmitting antennas in space.

3. The system according to claim 2, characterized in that, The step of controlling the radio frequency switch to switch the transmission path of the transmission signal according to the position of the receiving unit includes: When multiple receiving units are within the coverage area of ​​adjacent overlapping transmitting antennas, the main controller generates a clock signal with a preset period through a built-in timer, and outputs a first control command to the radio frequency switch according to the clock signal; According to the first control command, the radio frequency switch selects all top-level transmitting antennas or all bottom-level transmitting antennas in the first cycle, and selects the transmitting antennas that were not selected in the previous cycle in the second cycle. The first cycle and the second cycle have the same duration.

4. The system according to claim 2, characterized in that, Controlling the RF switch to switch the transmission path of the transmitted signal according to the position of the receiving unit includes: When multiple receiving units are within the coverage area of ​​non-adjacent overlapping transmitting antennas, or when only a single receiving unit exists, the main controller outputs a second control command to the RF switch, causing the RF switch to simultaneously select the transmitting antenna corresponding to each receiving unit.

5. The system according to claim 1, characterized in that, The signal processing flow for controlling the near-field communication chip of the receiving unit based on the handshake verification result of the received signal includes: The sub-controller acquires the signal from the transmitter through the receiving antenna and verifies the handshake identifier in the signal; If the verification is successful, the sub-controller controls the near-field communication chip of the receiving unit to switch the signal demodulation parameters, adjust the receiving gain, and start the signal acquisition and decoding process of the receiving antenna path corresponding to the current working antenna group.

6. The system according to claim 1, characterized in that, The transmitting end near-field communication chip and the receiving unit near-field communication chip have a simulated front-end function, which is used to skip redundant protocol steps.

7. The system according to claim 1, characterized in that, The radio frequency switch is a single-pole multi-throw radio frequency switch. The main controller outputs high and low level signals to the control terminal of the single-pole multi-throw radio frequency switch to achieve the selection control of different transmitting antenna paths.

8. The system according to claim 1, characterized in that, The antenna tuning circuit of the receiving unit is used to adjust the impedance of the receiving antenna so that the impedance of the receiving antenna matches that of the near-field communication chip of the receiving unit.

9. The system according to claim 1, characterized in that, The near-field communication chip at the transmitter is connected to a top-level transmitting antenna and a bottom-level transmitting antenna respectively via radio frequency switches.

10. A method for use in a near-field wireless communication system for a magnetic drive conveyor line as described in any one of claims 1-9, characterized in that, The method includes: After the transmitter is started, the main controller controls the RF switch to switch the transmission path of the transmission signal according to the position of the receiver, so that the top and bottom layer transmitting antennas of the stator printed circuit board are working, and only the non-overlapping transmitting antennas are working at the same time; each transmitting antenna is connected to the RF switch through the corresponding transmitter antenna tuning circuit, and the RF switch works with the transmitter near-field communication chip to realize signal transmission. In the receiving end, which moves synchronously with the mover of the magnetic drive conveyor line, the sub-controller of the receiving unit controls the near-field communication chip of the receiving unit to process the signal sensed by the receiving antenna according to the handshake verification result of the received signal; the receiving antenna corresponds one-to-one with the top-level transmitting antenna or the bottom-level transmitting antenna, and is connected to the near-field communication chip of the receiving unit through the antenna tuning circuit of the receiving unit. Near-field wireless communication between the stator and mover in a magnetic drive conveyor line is achieved through the coordinated interaction of the transmitter and receiver.

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