Low-power-consumption magnetic Bluetooth RFID card reader

Abstract

The utility model belongs to the technical field of radio frequency identification, and particularly discloses a low-power-consumption magnetic Bluetooth RFID card reader which comprises a magnetic shell, and a mainboard PCBA, an antenna board and a high-voltage high-density battery are embedded in the magnetic shell. The mainboard PCBA is electrically connected with the antenna board and the high-voltage high-density battery. The card reader adopts a highly integrated design, different functional modules are integrated together to form the mainboard PCBA, the mainboard PCBA, the high-voltage high-density battery and the antenna board are all embedded in the magnetic attraction shell, and the whole card reader is small and light; and the magnetic card reader has a magnetic attraction function, can be fixed on a mobile phone or a tablet computer through magnetic attraction, is convenient for a user to carry and use, and meets various requirements of reading IC and ID cards outdoors.

Description

Technical Field

[0001] The utility model belongs to the technical field of wireless radio frequency identification, and in particular relates to a low-power consumption magnetic attraction Bluetooth RFID card reader. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] RFID card reader is an automatic identification device that can read electronic tag data. As identification technology becomes more and more mature, the relevant application scenarios of card readers are becoming more and more extensive, and relevant upgrades are inevitably needed to meet the increasingly diverse identification needs.

[0004] However, the Bluetooth card readers currently on the market are large in size, inconvenient to move and carry, and magnetic fixation may also cause them to fall due to their large size. Utility Model Content

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a low-power magnetic Bluetooth RFID card reader.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0007] The utility model provides a low-power magnetic Bluetooth RFID card reader in a first aspect, comprising a magnetic housing, wherein the magnetic housing is embedded with a mainboard PCBA, an antenna board and a high-voltage and high-density battery;

[0008] The mainboard PCBA is electrically connected to the antenna board and the high-voltage and high-density battery respectively.

[0009] Furthermore, the mainboard PCBA includes a mainboard MCU chip, a USB Type-C female connector, a PMU power management unit, a power on / off control unit, an RFID card reader unit, a wireless communication unit, and an acoustic and optical control unit;

[0010] The mainboard MCU chip is electrically connected to the USB Type-C female connector, the PMU power management unit, the power on / off control unit, the RFID card reader unit, the wireless communication unit and the sound and light control unit respectively.

[0011] Further, the PMU power management module includes a PMU chip and a power conversion module; the load working power supply of the PMU chip is electrically connected to the power conversion module, and the power conversion module includes a low voltage difference linear regulator for providing a 3.3V power supply;

[0012] The I2C 1 communication pin of the mainboard MCU chip is electrically connected to the I2C communication pin of the PMU chip, and the charging status detection pin of the mainboard MCU chip is electrically connected to the charging status indication pin of the PMU chip.

[0013] Furthermore, the high-voltage and high-density battery is provided with a battery power lead, an NTC thermistor lead and a ground lead;

[0014] The battery power pin of the PMU chip is electrically connected to the battery power lead of the high-voltage and high-density battery, and the battery status monitoring pin of the PMU chip is electrically connected to the NTC thermistor lead of the high-voltage and high-density battery.

[0015] Furthermore, the USB communication pin of the mainboard MCU chip is electrically connected to the USB communication pin of the USB Type-C female connector.

[0016] Furthermore, the on / off control unit includes a hardware delay control module and a switch control module, and the hardware delay control module is electrically connected to the switch control module;

[0017] The power on / off detection pin of the mainboard MCU chip is electrically connected to the hardware delay control module, and the switch control pin of the mainboard MCU chip is electrically connected to the switch control module;

[0018] The hardware delay control module includes an RC delay circuit for controlling the closing and opening time of the switch.

[0019] Furthermore, the RFID card reader unit includes a security control module connector, a security control module, a flexible adapter board PCBA, a radio frequency chip and an antenna matching circuit;

[0020] The safety control module connector is electrically connected to the safety control module through a flexible adapter board PCBA; the safety control module supports an encryption binding function; the radio frequency chip is electrically connected to the antenna board through an antenna matching circuit;

[0021] Furthermore, the SPI communication pin of the mainboard MCU chip is electrically connected to the SPI communication pin of the radio frequency chip.

[0022] Further, the radio communication unit includes a Bluetooth module and a Bluetooth antenna, and the Bluetooth module is electrically connected to the Bluetooth antenna;

[0023] The serial port 2 communication module of the mainboard MCU chip is electrically connected to the serial port communication module of the Bluetooth module.

[0024] Furthermore, the sound and light control unit includes an audio control module and a light control module;

[0025] The control module of the mainboard MCU chip is electrically connected to the lighting control module for controlling the working status and battery power indication; the control module of the mainboard MCU chip is electrically connected to the audio control module for controlling the working prompt sound.

[0026] One or more of the above technical solutions have the following beneficial effects:

[0027] (1) The card reader of the utility model adopts a highly integrated design, integrating different functional modules together to form a mainboard PCBA. The mainboard PCBA, high-voltage and high-density battery and antenna board are all embedded in a magnetic shell, and the whole is small and light; and it has a magnetic suction function, which supports magnetic fixation on mobile phones and tablets, making it easy for users to carry and use, and meeting various outdoor IC and ID card reading needs.

[0028] (2) The card reader of the utility model can communicate with the host computer device via Bluetooth or USB, thereby expanding the communication method between the card reader and the host computer and meeting the user's needs in various scenarios.

[0029] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0031] Figure 1 This is a schematic diagram of a low-power magnetic Bluetooth RFID card reader according to Example 1.

[0032] Figure 2 This is the mainboard MCU circuit schematic diagram of Example 1.

[0033] Figure 3 This is a schematic diagram of the PMU chip circuit of Example 1.

[0034] Figure 4 This is a schematic diagram of the USB Type-C female connector circuit of Example 1.

[0035] Figure 5 This is a schematic diagram of the connector circuit of Example 1.

[0036] Figure 6 This is a schematic diagram of the RF chip circuit of Example 1.

[0037] Figure 7This is a schematic diagram of the Bluetooth module circuit of Example 1.

[0038] Figure 8 This is a schematic diagram of the lighting control module circuit of Example 1. DETAILED DESCRIPTION

[0039] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0040] Embodiment 1

[0041] like Figure 1 As shown, the utility model proposes a low-power magnetic Bluetooth RFID card reader, including a magnetic shell, the magnetic shell is embedded with a mainboard PCBA, an antenna board and a high-voltage high-density battery, and the mainboard PCBA is electrically connected to the antenna board and the high-voltage high-density battery.

[0042] The mainboard PCBA includes the mainboard MCU chip, USB Type-C female connector, PMU power management unit, power on / off control unit, RFID card reader unit, radio communication unit and sound and light control unit; the mainboard MCU chip is electrically connected to the USB Type-C female connector, PMU power management unit, power on / off control unit, RFID card reader unit, radio communication unit and sound and light control unit. The circuit schematic diagram of the mainboard MCU chip is shown in the figure below. Figure 2 As shown, the main control MCU combines hardware circuit design to monitor multiple signal conditions and quickly enters standby mode when there is no work demand, thus minimizing power consumption.

[0043] In this embodiment, the PCBA layout is optimized, and different functional modules are integrated together to form a mainboard PCBA; and each chip is a low-power chip, the purpose is to reduce the power consumption of the whole machine, and the chip model can be selected according to needs, which will not be repeated here.

[0044] As a further technical solution, the PMU power management module includes a PMU chip and a power conversion module; the PMU chip is electrically connected to the power conversion module, and the power conversion module includes an LDO low voltage drop linear regulator that can provide a 3.3V power supply. Figure 3 shown.

[0045] The I2C 1 communication pins (PB6, PB7) of the mainboard MCU chip are electrically connected to the I2C communication pins (SCL, SDA) of the PMU chip, and the charging status detection pin (PA15) of the mainboard MCU chip is electrically connected to the charging status indication pin (STAT) of the PMU chip.

[0046] As a further technical solution, high-voltage and high-density batteries are lithium-ion batteries. High-voltage batteries mean high energy density. Under the same conditions of use, high-voltage batteries can release more capacity.

[0047] A battery power lead, an NTC thermistor lead and a ground lead are provided on the high-voltage and high-density battery; the battery power pin (BAT) of the PMU chip is electrically connected to the battery power lead of the high-voltage and high-density battery, and the battery status monitoring pin (NTC) of the PMU chip is electrically connected to the NTC thermistor lead of the high-voltage and high-density battery.

[0048] As a further technical solution, the USB communication pins (USB_N, USB_P) of the mainboard MCU chip are electrically connected to the USB communication pins of the USB Type-C female connector, and the power pin of the USB Type-C female connector is connected to the charging power pin (VBUS) of the PMU chip; the circuit schematic diagram of the USB Type-C female connector is as follows Figure 4 As shown. The USB Type-C female connector can support USB communication and also support adapter charging.

[0049] As a further technical solution, the on / off control unit includes a hardware delay control module and a switch control module, and the hardware delay control module is electrically connected to the switch control module;

[0050] The power on / off detection pin (PA8) of the mainboard MCU chip is electrically connected to the hardware delay control module, and the switch control pin (PC13) of the mainboard MCU chip is electrically connected to the switch control module.

[0051] The hardware delay control module includes an RC delay circuit, which applies the RC charging and discharging principle and designs and calculates the charging and discharging time threshold that meets the requirements through the charging and discharging voltage calculation formula. The power on / off detection pin (PA8) of the MCU chip monitors the charging and discharging time of the capacitor. When the monitoring condition meets the set threshold, the switch control pin (PC13) controls the switch control module to realize the software power on / off function. At the same time, after the RC charging and discharging time exceeds the hardware design theoretical value, the hardware delay control module can control the switch control module to realize the hardware power on / off action through its own hardware level change.

[0052] As a further technical solution, the RFID card reader unit includes a security control module connector, a security control module, a flexible adapter board PCBA, a radio frequency chip and an antenna matching circuit;

[0053] The safety control module connector is electrically connected to the safety control module through the flexible adapter board PCBA; the safety control module supports low power working mode and encryption binding function; the RF chip is electrically connected to the antenna board; the safety control module connector is as follows Figure 5 shown.

[0054] The serial port 1 communication pins (PA2, PA3) of the mainboard MCU chip are electrically connected to the serial port communication pins of the safety control module through the 9th and 10th pins of the safety control module connector, the I2C 2 communication pins (PB10, PB11) of the mainboard MCU chip are electrically connected to the I2C communication pins of the safety control module through the 7th and 8th pins of the safety control module connector, and the send and receive data identification pins (PB8, PC14) of the mainboard MCU chip are electrically connected to the send and receive data identification pins of the safety control module through the 5th and 6th pins of the safety control module connector.

[0055] The security control and power consumption control pin (PB1) of the mainboard MCU chip is electrically connected to the power consumption control pin of the security control module through the 4th pin of the security control module connector. The mainboard MCU chip can control the working mode of the security control module.

[0056] As a further technical solution, the SPI communication pins (PA5, PA6, PA7, PB12) of the mainboard MCU chip are electrically connected to the SPI communication pins (SCK, MISO, MOSI, NSS) of the RF chip; the RF chip is as follows: Figure 6 shown.

[0057] The RF chip (pins RF1, RF2, RF3, RF4) is electrically connected to the antenna matching circuit, and the antenna matching circuit is electrically connected to the antenna board. The antenna matching circuit includes an LC filter circuit and an impedance matching circuit. The output end of the LC filter circuit is connected to the impedance matching circuit. The impedance matching circuit is a π-type impedance matching circuit. By using the impedance matching circuit, the energy loss of the card reader motherboard PCBA and the antenna can be minimized. With the help of the Smith chart and the network analyzer, the impedance matching calculation test is performed, and the antenna energy loss is minimized and the power consumption is reduced by optimizing the impedance matching. The circuit structure and optimization method of the π impedance matching circuit belong to the prior art and will not be repeated here.

[0058] As a further technical solution, the radio communication unit includes a Bluetooth module and a Bluetooth antenna, the Bluetooth module is electrically connected to the Bluetooth antenna; the Bluetooth module is as follows Figure 7 As shown, the serial port 2 communication pins (PA9, PA10) of the mainboard MCU chip are electrically connected to the serial port communication pins (UART_TX, UART_RX) of the Bluetooth module. The Bluetooth module has a low-power working mode. The mainboard MCU chip can send specific AT commands to control the working mode of the Bluetooth module to achieve low-power design.

[0059] As a further technical solution, the sound and light control unit includes an audio control module and a light control module; the light control module is as follows Figure 8As shown, the control pins (PB13, PB14, PB15, PB2, PB3, PB5) of the mainboard MCU chip are electrically connected to the lighting control module for controlling the working status and battery power indication; the control pin (PC15) of the mainboard MCU chip is electrically connected to the audio control module for controlling the working prompt sound.

[0060] The working principle of the utility model is:

[0061] When the card reader communicates with the host computer via Bluetooth, the Bluetooth module will send the received host computer data to the mainboard MCU chip through the TTL serial port; when the card reader communicates with the host computer via USB, the mainboard MCU will receive the host computer data through the USB Type-C female connector. The mainboard MCU chip will perform protocol analysis on the received signal, analyze the corresponding card reading instruction information, and transmit the corresponding information to the security control module through the corresponding serial port.

[0062] After receiving the command information, the security control module performs corresponding analysis and encryption, and then transmits the specific command to the mainboard MCU chip through I2C, and then further transmits it to the RF chip through SPI. After receiving the card reading information, the RF chip modulates the signal according to ISO / IEC 14443 requirements, and then sends it to the antenna board after the antenna matching circuit to communicate with the contactless card being read.

[0063] After receiving the reply signal from the card, the RF chip analyzes and processes it and sends the returned information to the mainboard MCU chip. After the mainboard MCU chip analyzes and processes it, it sends the returned signal to the security control module through I2C. After receiving the returned information, the security control module will first decrypt it, and then transmit the decrypted signal back to the mainboard MCU chip through the serial port. The mainboard MCU chip receives the card data sent back by the serial port and then transmits it back to the host computer through the corresponding Bluetooth or USB interface that communicates with the host computer.

[0064] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A low-power magnetic Bluetooth RFID card reader, characterized by: It includes a magnetic shell, wherein the magnetic shell has a mainboard PCBA, an antenna board and a high-voltage and high-density battery embedded therein; The mainboard PCBA is electrically connected to the antenna board and the high-voltage and high-density battery respectively; The motherboard PCBA includes a motherboard MCU chip, a USB Type-C female connector, a PMU power management unit, a power on / off control unit, an RFID card reader unit, a wireless communication unit, and an audio-visual control unit; The mainboard MCU chip is electrically connected to the USB Type-C female connector, the PMU power management unit, the power on / off control unit, the RFID card reader unit, the wireless communication unit and the sound and light control unit respectively.

2. A low-power magnetic Bluetooth RFID card reader according to claim 1, characterized in that: The PMU power management unit includes a PMU chip and a power conversion module; the load working power supply of the PMU chip is electrically connected to the power conversion module, and the power conversion module includes a low voltage difference linear regulator for providing a 3.3V power supply; The I2C 1 communication pin of the mainboard MCU chip is electrically connected to the I2C communication pin of the PMU chip, and the charging status detection pin of the mainboard MCU chip is electrically connected to the charging status indication pin of the PMU chip.

3. A low-power magnetic Bluetooth RFID card reader according to claim 2, characterized in that: The high-voltage and high-density battery is provided with a battery power lead, an NTC thermistor lead and a ground lead; The battery power pin of the PMU chip is electrically connected to the battery power lead of the high-voltage and high-density battery, and the battery status monitoring pin of the PMU chip is electrically connected to the NTC thermistor lead of the high-voltage and high-density battery.

4. The low-power magnetic Bluetooth RFID card reader according to claim 1 is characterized in that: The USB communication pin of the mainboard MCU chip is electrically connected to the USB communication pin of the USB Type-C female connector.

5. The low-power magnetic Bluetooth RFID card reader according to claim 1 is characterized in that: The on / off control unit includes a hardware delay control module and a switch control module, and the hardware delay control module is electrically connected to the switch control module; The power on / off detection pin of the mainboard MCU chip is electrically connected to the hardware delay control module, and the switch control pin of the mainboard MCU chip is electrically connected to the switch control module; The hardware delay control module includes an RC delay circuit for controlling the closing and opening time of the switch.

6. The low-power magnetic Bluetooth RFID card reader according to claim 1, characterized in that: The RFID card reader unit includes a security control module connector, a security control module, a flexible adapter board PCBA, a radio frequency chip and an antenna matching circuit; The security control module connector is electrically connected to the security control module via a flexible adapter board PCBA; the security control module supports an encryption binding function; and the radio frequency chip is electrically connected to the antenna board via an antenna matching circuit.

7. The low-power magnetic Bluetooth RFID card reader according to claim 6 is characterized by: The SPI communication pin of the mainboard MCU chip is electrically connected to the SPI communication pin of the radio frequency chip.

8. The low-power magnetic Bluetooth RFID card reader according to claim 1, characterized in that: The wireless communication unit includes a Bluetooth module and a Bluetooth antenna, and the Bluetooth module is electrically connected to the Bluetooth antenna; The serial port 2 communication module of the mainboard MCU chip is electrically connected to the serial port communication module of the Bluetooth module.

9. The low-power magnetic Bluetooth RFID card reader according to claim 1, characterized in that: The sound and light control unit includes an audio control module and a light control module; The control pin of the mainboard MCU chip is electrically connected to the light control module for controlling the working state and battery power indication; the control pin of the mainboard MCU chip is electrically connected to the audio control module for controlling the working prompt sound.

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