Multi-channel RFID read-write system applied to immunodetection module

Abstract

The utility model discloses a multipath RFID read-write system applied to an immunodetection module, comprising a central processor, a first universal synchronous / asynchronous serial transmit-receive interface (USART1) of the central processor is in communication connection with an upper computer through an MAX3232 transceiver; a second universal synchronous / asynchronous serial transceiving interface (USART2) of the central processing unit is connected with the input end of the multiplexing circuit, and a universal programmable I / O port (GPIO) of the central processing unit is connected with the control end of the multiplexing circuit; and the output end of the multiplexing circuit is connected with the radio frequency antenna unit through the communication conversion circuit. According to the utility model, read-write operation of multi-path and multi-functional RFID is realized, the design of a control system is optimized, the problem that each radio frequency antenna needs to be matched with a set of read-write control system to read tag data of an antenna with one function is solved, and the problems of detection system redundancy and resource waste caused by the problem are solved; and long-distance signal transmission can be carried out, and the functions of detecting instrument position tracking, identity binding and data transmission are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a multi -channel RFID read -write system especially a multi -channel RFID read -write system for immunodetection module. BACKGROUND

[0002] With the development of precision medicine, the number of medical sample detection increases, which requires diagnostic detection instruments to have multi -item, multi -category pipeline detection.

[0003] RFID is the non - contact data communication based on radio frequency wireless transmission, can realize the identity binding of sample tray and detection sample in medical transportation pipeline and the transmission tracking of module detection data. Since RFID is according to the high -frequency magnetic field coupling mode to carry out information transmission, this makes the design and working environment of radio frequency antenna have very high requirement, especially in special working environment, the radio frequency antenna needs to be individually impedance matched and size designed. For example, when carrying out non - contact position tracking, identity binding and data transmission to detection sample in single module and between different detection modules, the radio frequency antenna in different detection positions, different functions needs to be different impedance matched, currently, a set of read -write control system is needed to match each radio frequency antenna to carry out sample label information reading, leading to detection system redundancy and resource waste, greatly increase the manufacturing cost and control complexity of detection system. SUMMARY

[0004] Therefore, the utility model provides a multi -channel RFID read -write system for immunodetection module, realizes the stable work of different function radio frequency antennas and reads the success rate of label.

[0005] To realize above -mentioned purpose, the utility model adopts following technical scheme:

[0006] The multi -channel RFID read -write system for immunodetection module, including central processing unit, the first general synchronous / asynchronous serial transceiver interface (USART1) of central processing unit is connected with host computer communication through MAX3232 transceiver, and the second general synchronous / asynchronous serial transceiver interface (USART2) of central processing unit is connected with multiplexing circuit input, and the general programmable I / O port (GPIO) of central processing unit is connected with multiplexing circuit control end, and multiplexing circuit output is connected with radio frequency antenna unit through communication conversion circuit.

[0007] Optionally, the multiplexing circuit comprises a plurality of MOS transistors, the source of each MOS transistor is connected to the second universal synchronous / asynchronous serial transceiver interface of the central processing unit, the gate of each MOS transistor is connected to the universal programmable I / O port of the central processing unit, and the drain of each MOS transistor is connected to the radio frequency antenna unit through the communication conversion circuit.

[0008] Optionally, the communication conversion circuit comprises a first RS422 full-duplex transceiver and a second RS422 full-duplex transceiver connected in series.

[0009] Optionally, the radio frequency antenna unit comprises a plurality of antenna units of the same structure, and each antenna unit comprises a radio frequency chip (FM17622) and a receiving circuit, a transmitting circuit, an impedance matching circuit and an antenna.

[0010] Optionally, the receiving circuit comprises resistors R4 and R5 and capacitors C9 and C10, one end of the resistor R5 is connected to VMID and connected to ground GND through the capacitor C9, the other end of the resistor R5 is connected to RX and connected to one end of the capacitor C10 through the resistor R4.

[0011] The transmitting circuit comprises inductors L1 and L2 and capacitors C11 and C12, the capacitors C11 and C12 form a series circuit, one end of the capacitor C11 is connected to the first end of the inductor L1 and the other end of the capacitor C10, the second end of the inductor L1 is connected to TX2, the connection point of the capacitor C11 and the capacitor C12 is connected to ground GND, the capacitor C12 is connected to the first end of the inductor L2, and the second end of the inductor L2 is connected to TX1; the inductors L1 and L2 and the capacitors C11 and C12 form a low-pass filter.

[0012] The impedance matching circuit comprises capacitors C1, C2, C3, C4, C5, C6, C7 and C8, the capacitors C1 and C7 form a first capacitor parallel circuit, the capacitors C2 and C8 form a second capacitor parallel circuit, the capacitors C3 and C4 form a first capacitor series circuit, the capacitors C5 and C6 form a second capacitor series circuit, one end of the first capacitor parallel circuit is connected to the first end of the inductor L1, and one end of the second capacitor parallel circuit is connected to the first end of the inductor L2; the first capacitor series circuit and the second capacitor series circuit are connected between the other end of the first capacitor parallel circuit and the other end of the second capacitor parallel circuit, respectively; the connection point of the capacitors C3 and C4 and the connection point of the capacitors C5 and C6 are connected to ground GND, respectively.

[0013] The antenna is composed of two rectangular coils connected in series and resistors R1, R2 and R3; one end of the two rectangular coils connected in series is connected with a first capacitor parallel circuit through the resistor R1, the other end of the two rectangular coils connected in series is connected with a second capacitor parallel circuit through the resistor R3, and the connection point of the two rectangular coils connected in series is connected with the ground GND through the resistor R3; R1, R2 and R3 play the role of differential antenna connection.

[0014] Further, the radius of each rectangular coil is half of the detection distance; in actual application, the inductance and capacitance parameters of the two rectangular coils connected in series are measured through a bridge, so that the standing wave ratio reaches 1.2-1.5, so as to achieve the optimal antenna power transmission parameters.

[0015] The utility model adopts a set of control system, uses multiplex switching mode, adopts RS422 full duplex communication connection, realizes the read and write operation of RFID of multiple functions, optimizes the control system design, solves the problem that each radio frequency antenna needs to match a set of read and write control system to read a kind of functional antenna tag data, and the detection system redundancy and resource waste problem caused, and long-distance signal transmission can be carried out, satisfies the detection instrument position tracking, identity binding and data transmission function. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the circuit principle diagram of the multipath RFID read-write system of the utility model.

[0017] Figure 2 It is the circuit principle diagram of the multiplex circuit, communication conversion circuit and radio frequency antenna unit of the utility model.

[0018] Figure 3 It is the circuit principle diagram of the antenna unit of the utility model. DETAILED DESCRIPTION

[0019] The embodiments of the utility model will be described in detail below in combination with the drawings, and the embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation mode and specific operation process are given, but the protection scope of the utility model is not limited to the following embodiments.

[0020] It should be noted that, in the description of the utility model, the relationship terms such as 'first' and'second' are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or sequence between the entities or operations.

[0021] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection" that can appear should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements.For the person skilled in the art, the above-mentioned terms can be understood by the specific meaning in the utility model through specific circumstances.

[0022] As Figure 1 Indicated, the utility model discloses the utility model the multiplex RFID read-write system for immune detection module, including central processing unit, the central processing unit adopts STM32 singlechip (MCU), and the first general synchronous / asynchronous serial transceiver interface (USART1) of central processing unit is connected with host computer communication through MAX3232 transceiver, and the second general synchronous / asynchronous serial transceiver interface (USART2) of central processing unit is connected with multiplex circuit input end, and the general programmable I / O port (GPIO) of central processing unit is connected with the control end of multiplex circuit;The output end of multiplex circuit is connected with radio frequency antenna unit through communication conversion circuit.

[0023] The power supply adopts DC24V power supply, and the DC24V power supply is connected with central processing unit through 5 power converter and 3.3V power converter;The central processing unit I / O is connected with running indicator light, error indicator light and buzzer.

[0024] Beneficially or illustratively, as Figure 2 Indicated, the multiplex circuit includes a plurality of MOS tubes Qn (Q1\Q2\Q3\Q4\Q5), and the source of each MOS tube is connected with the second general synchronous / asynchronous serial transceiver interface (USART2) of central processing unit respectively, and the gate of each MOS tube is connected with the general programmable I / O port (GPIO) of central processing unit respectively, and the drain of each MOS tube is connected with radio frequency antenna unit through communication conversion circuit respectively.

[0025] Beneficially or illustratively, the communication conversion circuit is composed of first full duplex transceiver (RS422) and second full duplex transceiver (RS422) in series.

[0026] Beneficially or illustratively, as Figure 2 Indicated, the radio frequency antenna unit includes a plurality of structure same antenna units, and the embodiment is five structure same antenna units.

[0027] Beneficially or illustratively, as Figure 2 , 3As shown, the antenna unit is composed of a radio frequency chip (FM17622) and a receiving circuit 1, a transmitting circuit 2, an impedance matching circuit 3 and a radio frequency antenna 4.

[0028] The receiving circuit 1 is composed of resistors R4, R5 and capacitors C9, C10; one end of the resistor R5 is connected to the internal reference voltage VMID of the radio frequency chip (FM17622) and is connected to the ground GND through the capacitor C9; the other end of the resistor R5 is connected to the radio frequency input end RX of the radio frequency chip (FM17622) and is connected to one end of the capacitor C10 through the resistor R4.

[0029] The transmitting circuit 2 is composed of inductors L1, L2 and capacitors C11, C12; the capacitors C11, C12 form a series circuit, one end of the capacitor C11 is connected to the first end of the inductor L1 and the other end of the capacitor C10 respectively, the second end of the inductor L1 is connected to the second transmitting output end TX2 of the radio frequency chip (FM17622); the connection point of the capacitor C11 and the capacitor C12 is connected to the ground GND; the capacitor C12 is connected to the first end of the inductor L2, and the second end of the inductor L2 is connected to the first transmitting output end TX1 of the radio frequency chip (FM17622); the inductors L1, L2 and the capacitors C11, C12 form a low-pass filter.

[0030] The impedance matching circuit 3 is composed of capacitors C1, C2, C3, C4, C5, C6, C7, C8; the capacitors C1, C7 form a first capacitor parallel circuit, the capacitors C2, C8 form a second capacitor parallel circuit, the capacitors C3, C4 form a first capacitor series circuit, and the capacitors C5, C6 form a second capacitor series circuit; one end of the first capacitor parallel circuit is connected to the first end of the inductor L1, and one end of the second capacitor parallel circuit is connected to the first end of the inductor L2; the first capacitor series circuit and the second capacitor series circuit are connected between the other end of the first capacitor parallel circuit and the other end of the second capacitor parallel circuit respectively; the connection point of the capacitor C3 and the capacitor C4 and the connection point of the capacitor C5 and the capacitor C6 are connected to the ground GND respectively.

[0031] The radio frequency antenna 4 is composed of two rectangular coils 4.1, 4.2 connected in series and resistors R1, R2, R3; one end of the two rectangular coils 4.1, 4.2 connected in series is connected to the first capacitor parallel circuit through the resistor R1, the other end of the two rectangular coils 4.1, 4.2 connected in series is connected to the second capacitor parallel circuit through the resistor R3, and the connection point of the two rectangular coils 4.1, 4.2 connected in series is connected to the ground GND through the resistor R3; the resistors R1, R2, R3 function as a differential antenna.

[0032] In actual application, the radius of each rectangular coil 4.1, 4.2 is usually half of the detection distance; each antenna unit can be designed with different antenna matching circuit and radio frequency antenna according to different detection positions and corresponding detection distance requirements; the inductance and capacitance parameters of the two rectangular coils 4.1, 4.2 in series are measured by a bridge, and a spectrum analyzer is used to match the 50Ω impedance at the set frequency, and the matching capacitor needs to be selected according to the parameters of the two rectangular coils 4.1, 4.2 in series, so that the standing wave ratio reaches 1.2-1.5, so as to achieve the best antenna power transmission parameters.

[0033] The host computer selects the corresponding MOS tube Qn (Q1, Q2, Q3, Q4, Q5) controlled by the GPIO circuit according to the sample detection position and the antenna unit number in the immune module, and then sends the tag data reading and writing instructions through the serial port according to the program, and closes the MOS tube after completing reading and writing.

[0034] The working process of the utility model is briefly described as follows:

[0035] 1. System initialization, waiting for receiving host computer command data information;

[0036] 2. Data detection, detecting whether the host computer sends the correct command (including frame header, frame tail, data length and check byte), and recording which way the radio frequency antenna unit is operated and the block number of reading and writing.

[0037] 3. The multiplexing circuit switches the MOS tube of the single antenna loop according to the instructions of the data frame through Gpio.

[0038] 4. Reading and writing card operation: reading card operation includes: starting the antenna, radio frequency initialization, searching card, anti-collision, selecting card, verifying key and reading and writing card operation process.

[0039] Finally, it should be emphasized that the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, and for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified without creative labor, or some technical features can be replaced. Thus, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A multipath RFID read-write system applied to an immune detection module, characterized in that: The central processing unit is connected with the host computer through a transceiver via a first universal synchronous / asynchronous serial transceiver interface, and the second universal synchronous / asynchronous serial transceiver interface of the central processing unit is connected with the input end of the multiplexing circuit, and the universal programmable I / O port of the central processing unit is connected with the control end of the multiplexing circuit. The output end of the multiplexing circuit is connected with the radio frequency antenna unit via a communication conversion circuit.

2. The multipath RFID read-write system applied to the immune detection module according to claim 1, characterized in that: The multiplexing circuit comprises a plurality of MOS transistors, the source of each MOS transistor is connected with the second universal synchronous / asynchronous serial transceiver interface of the central processing unit, the gate of each MOS transistor is connected with the universal programmable I / O port of the central processing unit, and the drain of each MOS transistor is connected with the radio frequency antenna unit via the communication conversion circuit.

3. The multipath RFID read-write system for use in the immunoassay module according to claim 1 or 2, characterized in that: The communication conversion circuit comprises a first full-duplex transceiver and a second full-duplex transceiver connected in series.

4. The multipath RFID read-write system for use in the immunoassay module according to claim 1 or 2, wherein: The radio frequency antenna unit comprises a plurality of antenna units with the same structure, and each antenna unit comprises a radio frequency chip, a receiving circuit, a transmitting circuit, an impedance matching circuit and an antenna.

5. The multipath RFID read-write system for use in the immunoassay module according to claim 4, wherein: The receiving circuit comprises resistors R4 and R5 and capacitors C9 and C10; one end of the resistor R5 is connected with VMID and connected with ground GND through the capacitor C9; the other end of the resistor R5 is connected with RX and connected with one end of the capacitor C10 through the resistor R4; The transmitting circuit comprises inductors L1 and L2 and capacitors C11 and C12; the capacitors C11 and C12 form a series circuit, one end of the capacitor C11 is connected with the first end of the inductor L1 and the other end of the capacitor C10, the second end of the inductor L1 is connected with TX2; the connection point of the capacitor C11 and the capacitor C12 is connected with ground GND; the capacitor C12 is connected with the first end of the inductor L2, and the second end of the inductor L2 is connected with TX1; the inductors L1 and L2 and the capacitors C11 and C12 form a low-pass filter; The impedance matching circuit comprises capacitors C1, C2, C3, C4, C5, C6, C7 and C8; the capacitors C1 and C7 form a first capacitor parallel circuit, the capacitors C2 and C8 form a second capacitor parallel circuit, the capacitors C3 and C4 form a first capacitor series circuit, and the capacitors C5 and C6 form a second capacitor series circuit; one end of the first capacitor parallel circuit is connected with the first end of the inductor L1, and one end of the second capacitor parallel circuit is connected with the first end of the inductor L2; the first capacitor series circuit and the second capacitor series circuit are connected between the other end of the first capacitor parallel circuit and the other end of the second capacitor parallel circuit, respectively; the connection point of the capacitor C3 and the capacitor C4 and the connection point of the capacitor C5 and the capacitor C6 are connected with ground GND, respectively. The antenna (4) is composed of two rectangular coils and resistors R1, R2 and R3 in series; one end of the two rectangular coils in series is connected with a first capacitor parallel circuit through the resistor R1, the other end of the two rectangular coils in series is connected with a second capacitor parallel circuit through the resistor R3, and the connection point of the two rectangular coils in series is connected with the ground GND through the resistor R3; R1, R2 and R3 play the role of differential antenna connection.

6. The multipath RFID read-write system for use in the immunoassay module according to claim 5, wherein: The radius of each rectangular coil is half of the detection distance.

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