A dual-mode driverless USB RFID card issuer

Abstract

A dual-mode drive-free USB RFID card dispenser solves the problem that the existing RFID card dispenser does not have the function of simultaneously reading and writing high-frequency cards and ultra-high-frequency tags, comprising a power supply unit, a main control unit, an ultra-high-frequency unit, a high-frequency unit and an antenna unit; the power supply unit uses a USB power supply as the power input; the main control unit provides a USB interface for realizing USB drive-free communication and USB keyboard function; the ultra-high-frequency unit and the high-frequency unit are connected and controlled internally; the antenna unit comprises a separate high-frequency unit antenna and an ultra-high-frequency unit antenna; the ultra-high-frequency unit antenna is arranged in the inner circle of the high-frequency unit antenna. The USB can be powered, the product power consumption is reduced, the USB drive-free problem is solved, the USB communication and keyboard input switching problem is solved; the ultra-high-frequency unit antenna is arranged in the inner circle of the high-frequency unit antenna, forming a high-frequency and ultra-high-frequency integrated antenna, improving the ultra-high-frequency performance, enabling the ability to read and write special tags and small tags; and simultaneously having the functions of high-frequency and ultra-high-frequency.

Description

Technical Field

[0001] This invention relates to the field of RFID card issuer technology. Background Technology

[0002] As RFID (Radio Frequency Identification) applications expand, more people are experiencing the convenience and efficiency brought by RFID technology. RFID card issuers, as an indispensable component of RFID application systems, are used in many situations, such as conventional card writing, access control, retail store checkouts, and libraries. User needs vary depending on the application. Some applications require only high-frequency cards, such as access cards, library cards, and assembly line trays; others require ultra-high-frequency tags, such as in the clothing industry and express delivery; and still others require both high-frequency cards and ultra-high-frequency tags, such as in the wine industry for anti-counterfeiting. At the beginning of each process flow, RFID card issuers are needed to read or write application-related data into the corresponding cards.

[0003] Among the existing products on the market, those targeting RFID card issuance needs mainly fall into the following categories:

[0004] 1. A small UHF all-in-one machine is used as a card issuer to read and write UHF tags. This type of card issuer is only for UHF tags. The interface is mainly network port and RS232. It requires separate power supply, and is relatively large and expensive.

[0005] 2. Dedicated card-issuing equipment is used to read and write UHF tags. These card issuers are only designed for UHF tags, and their interfaces are mostly USB-to-serial, with some also having RS232 interfaces and Ethernet ports. Some even require separate power supplies. However, these products have low performance and are difficult to write to special or small tags. Furthermore, the antenna has poor directionality, making it easy to read tags around the card issuer. Summary of the Invention

[0006] In summary, the purpose of this invention is to address the shortcomings of existing RFID card issuers, such as the lack of compatibility with simultaneous reading and writing of high-frequency cards and ultra-high-frequency tags, the requirement for separate power supply for ultra-high-frequency integrated card issuers, their large size and high price, the lack of switchable USB communication and keyboard input functions, and the susceptibility to cross-reading. Therefore, this invention proposes a dual-mode driverless USB RFID card issuer.

[0007] To address the shortcomings of the technology proposed in this invention, the following technical solution is adopted:

[0008] A dual-mode driverless USB RFID card issuer, characterized in that the card issuer comprises: a power supply unit, a main control unit, an ultra-high frequency unit, a high frequency unit, and an antenna unit; wherein,

[0009] The power supply unit uses USB power as the power input and converts the 5V power into the power required for the operation of the main control unit, ultra-high frequency unit and high frequency unit for output.

[0010] The main control unit provides a USB interface for external communication and USB keyboard functionality; internally, it connects to and controls the UHF unit and the HF unit, enabling the reading and writing of UHF tags and HF cards; the main control unit is also connected to a working mode switching key for switching the working state of the UHF unit or the HF unit.

[0011] The UHF unit, used for UHF tag reading and writing, consists of an UHF RF chip, a power amplifier, and a directional coupler. The UHF RF chip is used for encoding and decoding UHF signals; the power amplifier amplifies the signal output by the RF chip, up to a maximum of 23dBm; and the directional coupler separates the transmit and receive signals.

[0012] The high-frequency unit, used for high-frequency card read / write processing, includes a high-frequency radio frequency chip for high-frequency signal encoding and decoding and a matching network circuit for adjusting the matching antenna unit.

[0013] The antenna unit is connected to the ultra-high frequency unit and the high frequency unit respectively, enabling the reading and writing of ultra-high frequency tags and high frequency cards; the antenna unit includes an independent high frequency unit antenna and an ultra-high frequency unit antenna; the ultra-high frequency unit antenna is located in the inner circle of the high frequency unit antenna.

[0014] The technical solutions that further define the present invention include:

[0015] The ultra-high frequency unit antenna adopts a five-sided metal sheet structure. The antenna unit also includes a shielded shell with shielding junctions on all four sides, which limits the ultra-high frequency signal of the ultra-high frequency unit antenna to be radiated only in a forward direction.

[0016] The main control unit is also connected to a data transmission status indicator, a data reception status indicator, and a buzzer; the power input terminal of the power supply unit is connected to a power indicator.

[0017] The power supply unit uses a TYPE_C interface to connect to a USB power source.

[0018] The beneficial effects of this invention are as follows: This invention uses USB power as the power input, integrates an ultra-high frequency unit and a high frequency unit, and switches between them through the main control unit, solving the problem that ultra-high frequency and high frequency cannot be read simultaneously; it can be powered via USB, reducing product power consumption, solving the problem of USB driverless operation, and solving the problem of switching between USB communication and keyboard input; the ultra-high frequency unit antenna is located in the inner ring of the high frequency unit antenna, forming an integrated high frequency and ultra-high frequency antenna, improving ultra-high frequency performance, and enabling the ability to read and write special tags and small tags; it also has high frequency and ultra-high frequency functions. Attached Figure Description

[0019] Figure 1 This is a structural principle block diagram of the present invention;

[0020] Figure 2 This is a block diagram illustrating the structural principle of the ultra-high frequency unit of the present invention;

[0021] Figure 3 This is a schematic diagram of the antenna unit of the present invention;

[0022] Figure 4 This is a schematic diagram of the shielding housing structure of the antenna unit of the present invention;

[0023] Figure 5 This is a circuit schematic diagram of the power supply unit and the main control unit of the present invention;

[0024] Figure 6 This is a circuit schematic diagram of the high-frequency unit of the present invention;

[0025] Figure 7 This is a circuit diagram of the ultra-high frequency unit of the present invention. Detailed Implementation

[0026] The structure of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0027] Reference Figures 1 to 7 As shown in the figure, the dual-mode driverless USB RFID card issuer disclosed in this invention includes: a power supply unit, a main control unit, an ultra-high frequency unit, a high frequency unit, and an antenna unit; wherein,

[0028] The power supply unit uses USB power as its input, converting 5V power into the power required for the main control unit, ultra-high frequency unit, and high frequency unit to operate. Specifically, the power supply unit provides power to the entire system of this invention. It uses USB power (VBUS) as its input, outputting one 3.3V power supply (V33_CPU) for the main control unit, one 3.3V power supply (V33_RF) for the high frequency or ultra-high frequency power supply, and one 2.7V power supply (V27_PA) for the power amplifier of the ultra-high frequency unit. The maximum current consumption of the entire system is 400mA, meeting the USB power supply requirements. Preferably, a USB power supply is connected via a Type-C interface.

[0029] The main control unit provides an external USB interface for driverless USB communication and USB keyboard functionality; internally, it connects to and controls the UHF and HF units, enabling the reading and writing of UHF tags and HF cards. The main control unit also features a working mode switch for switching the operating status of the UHF or HF units. Furthermore, the main control unit is connected to a data transmission status indicator LED302, a data reception status indicator LED301, and a buzzer SP301. The power supply unit's power input is connected to a power indicator LED303. The data transmission status indicator LED302, data reception status indicator LED301, and buzzer SP301 provide a clear view of the invention's operating status, and the user is notified when card reading or writing is successful. Figure 5 In this example, the main control unit uses the N32G4FRKEQ7 microcontroller U401.

[0030] UHF unit, used for UHF tag reading and writing, such as Figure 2 As shown, the UHF unit comprises an UHF RF chip U105, a power amplifier U102, and a directional coupler. The UHF RF chip is used for encoding and decoding UHF signals. The power amplifier U102 amplifies the signal output from the UHF RF chip U105, up to a maximum amplification of 23dBm. The directional coupler separates the transmit and receive signals. In this invention, the power amplifier uses a chip with an efficiency of over 50% to ensure that the power consumption of the entire system meets the design requirements. Figure 7 As shown in the figure, in this embodiment, the ultra-high frequency radio frequency chip U105 adopts the E310 type RAIN RFID reader chip, and the power amplifier U102 adopts the SKY65111 type amplifier.

[0031] High-frequency unit, used for high-frequency card read / write processing, such as Figure 6As shown, it includes a high-frequency radio frequency chip U201 for high-frequency signal encoding and decoding and a matching network circuit for adjusting the matching antenna unit; high-frequency communication uses electromagnetic field coupling, and the function of the matching network circuit is to adjust the matching network so that the antenna works at its best performance. Figure 6 In the middle, the high-frequency radio frequency chip adopts the ST25R3916 high-frequency card reader NFC chip.

[0032] Antenna elements, such as Figure 3 and Figure 4 As shown, the UHF unit and HF unit are connected respectively, enabling simultaneous reading and writing of UHF tags and HF cards. The antenna unit includes independent HF unit antennas and UHF unit antennas; the UHF unit antenna is located within the inner ring of the HF unit antenna. The UHF unit antenna adopts a 5-sided metal sheet structure. The antenna unit also includes a shielded shell with shielding junctions on all four sides, limiting the UHF signal of the UHF unit antenna to radiate only in a forward direction. This ensures the reliable performance of the HF and UHF antennas, prevents interference and mutual influence, and maintains a compact and exquisite product. It also solves the problem of UHF signal leakage and cross-reading. Furthermore, based on the antenna simulation results, a shielding structure is designed on all four sides to ensure that the UHF signal can only radiate in a forward direction.

Claims

1. A dual-mode driverless USB RFID card issuer, characterized in that... The card issuer includes: a power supply unit, a main control unit, an ultra-high frequency unit, a high frequency unit, and an antenna unit; wherein, The power supply unit uses USB power as the power input and converts the 5V power into the power required for the operation of the main control unit, ultra-high frequency unit and high frequency unit for output. The main control unit provides a USB interface for external communication and USB keyboard functionality; internally, it connects to and controls the UHF unit and the HF unit, enabling the reading and writing of UHF tags and HF cards; the main control unit is also connected to a working mode switching key for switching the working state of the UHF unit or the HF unit. The UHF unit, used for UHF tag reading and writing, consists of an UHF RF chip, a power amplifier, and a directional coupler. The UHF RF chip is used for encoding and decoding UHF signals; the power amplifier amplifies the signal output by the RF chip, up to a maximum of 23dBm; and the directional coupler separates the transmit and receive signals. The high-frequency unit, used for high-frequency card read / write processing, includes a high-frequency radio frequency chip for high-frequency signal encoding and decoding and a matching network circuit for adjusting the matching antenna unit. The antenna unit is connected to the ultra-high frequency unit and the high frequency unit respectively, enabling the reading and writing of ultra-high frequency tags and high frequency cards; the antenna unit includes an independent high frequency unit antenna and an ultra-high frequency unit antenna; the ultra-high frequency unit antenna is located in the inner circle of the high frequency unit antenna. The ultra-high frequency unit antenna adopts a 5-sided metal sheet structure. The antenna unit also includes a shielded shell with shielding junctions on all four sides, which limits the ultra-high frequency signal of the ultra-high frequency unit antenna to be radiated only in a forward direction. The power supply unit uses a TYPE_C interface to connect to a USB power source.

2. The dual-mode driverless USB RFID card issuer according to claim 1, characterized in that: The main control unit is also connected to a data transmission status indicator, a data reception status indicator, and a buzzer; the power input terminal of the power supply unit is connected to a power indicator.

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