CN218941115U

CN218941115U - Universal wireless gateway device based on 5G NB-IoT

Info

Publication number: CN218941115U
Application number: CN202222803612.7U
Authority: CN
Inventors: 梅逢城; 宁磊; 魏浩; 魏玫; 陈勇
Original assignee: Shenzhen Technology University
Current assignee: Shenzhen Technology University
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-04-28
Anticipated expiration: 2032-10-24

Abstract

The utility model provides a universal wireless gateway device based on 5G NB-IoT, which comprises a power management module, an interface conversion module, a low-power consumption main control module, a memory and a 5G NB-IoT module, wherein the memory is connected with the low-power consumption main control module, the power management module is used for providing power for each functional unit of the wireless gateway device, managing a power supply mode and battery state information, the 5G NB-IoT module is connected to the low-power consumption main control module through a serial port, the low-power consumption main control module transmits data to the 5G NB-IoT module through an LPUART interface, and the 5G NB-IoT module establishes wireless communication with an internet of things platform through an NB base station. The gateway is used for solving the problems of difficulty in balancing power consumption and performance, discrete power supply, weak interface expansibility and the like of the existing gateway of the Internet of things.

Description

Universal wireless gateway device based on 5G NB-IoT

Technical Field

The utility model relates to the technical field of Internet of things equipment, in particular to a universal wireless gateway device based on 5G NB-IoT.

Background

With the development of the technology of the Internet of things, the technology maturity of the whole industrial chain of the Internet of things is greatly improved due to the reduction of the cost of the sensor and the upgrading of the transmission technology. And under the continuous promotion of digital transformation, various industries hug the Internet of things more closely, and domestic Internet of things equipment is billions. The gateway device of the internet of things is used as a tie for connecting the sensing network and the traditional communication network, and is indispensable to any large-scale network. With this technology, NB-IoT technology, a cellular-based narrowband internet of things technology, is also an optimal connection technology for low power consumption wide area internet of things (LPWA), carries the basic connection tasks of smart worlds such as smart home, smart trip, smart city, etc., and is widely applied to various aspects such as smart meters, smart parking, smart street lamps, smart agriculture, white appliances, etc., which is one of the basic connection technologies in the smart era.

After the gateway of the Internet of things is combined with the NB-IoT technology, the gateway has great progress in performance and power consumption. The 5NB-IoT internet of things is an emerging technology in the IoT field, supports cellular data connection of low-power-consumption equipment in a wide area network, when the NB-IoT internet of things is used, a device is needed to be used for connecting the device to equipment to be used for data conversion service, the application environment difference of terminal products in the internet of things is large, the product shells of the terminal products are undetachably designed, external power supply is usually used, and the charging of the products in some fields is a relatively complicated problem in the use process, so that more products powered by disposable batteries are used, the service life of the products is required to be as long as possible in order to realize the value of the products to the maximum, so that the terminal products are required to have excellent low-power consumption characteristics, and meanwhile, the BOM cost of the hardware of the products is required to be reduced for the possibility of mass application, and the problem that the hardware resources of the terminal products are limited is solved.

Traditional gateway devices mostly rely on 2G/3G and 4G networks, which are difficult to balance in power consumption, transmission rate, coverage capability, and device cost. In addition, the traditional gateway is single in interface, does not support most common interface protocols, and is weak in interface expansibility.

Disclosure of Invention

The utility model provides a universal wireless gateway device based on 5G NB-IoT, which is used for solving the problems that the existing gateway of the Internet of things is difficult to balance power consumption and performance, discrete in power supply, weak in interface expansibility and the like.

The utility model realizes the above purpose through the following technical scheme:

a 5G NB-IoT based generic wireless gateway device, comprising: the system comprises a power management module, an interface conversion module, a low-power-consumption main control module, a memory and a 5G NB-IoT module, wherein the memory is connected with the low-power-consumption main control module, the power management module is used for providing power for each functional unit of the wireless gateway device, managing a power supply mode and battery state information, the 5G NB-IoT module is connected to the low-power-consumption main control module through a serial port, the low-power-consumption main control module transmits data to the 5G NB-IoT module through an LPUART interface, and the 5G NB-IoT module establishes wireless communication with an Internet of things platform through an NB base station;

the interface conversion module comprises a USB-serial port conversion circuit, a UART-RS485 conversion circuit and a UART-RS232 conversion circuit, wherein the USB-serial port conversion circuit is connected with a first UART port of the low-power-consumption main control module and is used for realizing USB-serial port protocol conversion, the UART port of the UART-RS485 conversion circuit is connected with a second UART port of the low-power-consumption main control module, the RS485 port of the UART-RS485 conversion circuit is connected with RS485 communication equipment, the UART port of the UART-RS232 conversion circuit is connected with a third UART port of the low-power-consumption main control module, and the RS232 port of the UART-RS232 conversion circuit is connected with the RS232 communication equipment.

The device further comprises a CAN signal conversion circuit, wherein a first interface of the CAN signal conversion circuit is connected with a CAN port of the low-power-consumption main control module, and a second interface of the CAN signal conversion circuit is connected with a CAN bus.

In a further scheme, the UART-RS485 conversion circuit comprises an RS485 interface circuit and a first level conversion chip, wherein the RS485 interface circuit is connected with a second UART port of the low-power-consumption main control module through the first level conversion chip, and an RS485B/RS485A interface is led out from the port and used for directly communicating with RS485 communication equipment.

In a further scheme, the UART-RS232 conversion circuit includes an RS232 interface circuit and a second level conversion chip, where the RS232 interface circuit is connected to a third UART port of the low-power consumption master control module through the level conversion chip, and an RS232_tx/RS232_rx interface is led out from a port for directly communicating with an RS232 communication device.

The CAN signal conversion circuit comprises a CAN interface circuit and a third level conversion chip, wherein the CAN interface circuit converts an external CAN signal into a TTL level signal through the third level conversion chip, the low-power-consumption main control module is connected with the third level conversion chip through the CAN1 RX and the CAN1 TX, an interface end of the CAN interface circuit is connected with an ohmic resistor, and a CANH/CANL interface is led out from the interface end and used for directly communicating with CAN equipment.

In a further scheme, the USB-serial port conversion circuit is a USB-to-serial port chip CH340, a USB port of the USB-to-serial port chip CH340 is connected to a USB interface, and a serial port of the USB-to-serial port chip CH340 is connected to a first UART port of the low-power consumption main control module.

In a further scheme, the low-power-consumption main control module comprises an STM32L431 single-chip microcomputer module.

In a further scheme, the 5G NB-IoT module is a BC95-CNV communication module, the USIM pin of the BC95-CNV communication module is connected with an SD card circuit, and the NB pin of the BC95-CNV communication module is connected with the NB pin of the STM32L431 singlechip module.

In a further scheme, the memory comprises a QSPI_FLASH chip, the low-power consumption main control module controls a clock signal of the QSPI_FLASH chip through a QSPI_CLK pin, and controls read-write signals of the QSPI_FLASH chip through a QSPI_IO0 pin and a QSPI_IO1 pin.

In a further aspect, the power management module includes a battery module and a power conversion module, where the battery module includes at least 2 large-capacity rechargeable lithium batteries for providing stable power to the wireless gateway device; the power conversion module boosts and outputs the voltage of the rechargeable lithium battery to 5V voltage of a system through the boosting chip, and outputs the 3.3V voltage of the system through the step-down chip so as to provide the voltage for the low-power-consumption main control module and other peripheral circuits.

Therefore, the utility model adopts the low-power control chip, the NB module and the power supply to integrate, has lower power consumption, realizes longer endurance in limited hardware resources, has better safety and reliability, improves the product performance under the condition of reducing the power consumption, and widens the use of 5G NB-IoT. Meanwhile, the interface protocol supported by the existing gateway is relatively single, most of industrial transmission protocols are supported on a hardware system, a low-power control chip is used as a core component, other network modules are connected through standard extensible interfaces, information exchange between other networks is established in a bus mode, and an NB (radio access point) IoT (Internet of things) module is used for communication with an Internet of things platform through an NB base station, so that the application scene and the application range of the product are enlarged, the reliability is higher, and the application scene and the application range are wider.

The utility model is described in further detail below with reference to the drawings and the detailed description.

Drawings

Fig. 1 is a first schematic diagram of an embodiment of a 5G NB-IoT based generic wireless gateway device of the present utility model.

Fig. 2 is a second schematic diagram of an embodiment of a 5G NB-IoT based generic wireless gateway device of the present utility model.

Fig. 3 is a schematic diagram of a power management module in an embodiment of a 5G NB-IoT based generic wireless gateway device of the present utility model powering various functional units of the wireless gateway device.

Fig. 4 is a schematic circuit diagram of a low power consumption master control module in an embodiment of a 5G NB-IoT based generic wireless gateway device according to the present utility model.

Fig. 5 is a schematic circuit diagram of a 5G NB-IoT module in an embodiment of a 5G NB-IoT based generic wireless gateway device of the present utility model.

Fig. 6 is a circuit schematic diagram of a power management module in an embodiment of a 5G NB-IoT based generic wireless gateway device of the present utility model.

Fig. 7 is a schematic circuit diagram of a USB-to-serial port conversion circuit in an embodiment of a 5G NB-IoT based generic wireless gateway device according to the present utility model.

Fig. 8 is a circuit schematic of a memory in an embodiment of a 5G NB-IoT based generic wireless gateway device of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present utility model fall within the protection scope of the present utility model.

Referring to fig. 1 and 2, a generic wireless gateway device based on 5G NB-IoT according to the present utility model includes: the system comprises a power management module 10, an interface conversion module 20, a low-power-consumption main control module 30, a memory and a 5G NB-IoT module 40, wherein the memory is connected with the low-power-consumption main control module 30, the power management module 10 is used for providing power for each functional unit of the wireless gateway device, managing power supply modes and battery state information, the 5G NB-IoT module 40 is connected to the low-power-consumption main control module 30 through a serial port, the low-power-consumption main control module 30 transmits data to the 5G NB-IoT module 40 through an LPUART interface, and the 5G NB-IoT module 40 establishes wireless communication with an Internet of things platform through an NB base station;

the interface conversion module 20 includes a USB-serial port conversion circuit 21, a UART-RS485 conversion circuit 22, and a UART-RS232 conversion circuit 23, where the USB-serial port conversion circuit 21 is connected with a first UART port of the low-power consumption main control module 30, and is used for implementing USB-serial port protocol conversion, the UART port of the UART-RS485 conversion circuit 22 is connected with a second UART port of the low-power consumption main control module 30, the RS485 port of the UART-RS485 conversion circuit 22 is connected with an RS485 communication device, the UART port of the UART-RS232 conversion circuit 23 is connected with a third UART port of the low-power consumption main control module 30, and the RS232 port of the UART-RS232 conversion circuit 23 is connected with an RS232 communication device.

The device further comprises a CAN signal conversion circuit 24, wherein a first interface of the CAN signal conversion circuit 24 is connected with a CAN port of the low-power-consumption main control module 30, and a second interface of the CAN signal conversion circuit 24 is connected with a CAN bus.

As shown in fig. 3 and 6, the power management module 10 includes a battery module including at least 2 large-capacity rechargeable lithium batteries for providing stable power supply to the wireless gateway device, and a power conversion module U6; the power conversion module U6 boosts and outputs the voltage of the rechargeable lithium battery to the system 5V voltage through the boost chip, and outputs the system 3.3V voltage through the buck chip to provide the voltage to the low-power consumption main control module 30 and other peripheral circuits.

As shown in fig. 4, the low-power-consumption main control module 30 includes an STM32L431 single chip module U1.

As shown in fig. 5, the 5G NB-IoT module 40 is a BC95-CNV communication module U5, the USIM pin of the BC95-CNV communication module U5 is connected to the SD card circuit, and the NB pin of the BC95-CNV communication module U5 is connected to the NB pin of the STM32L431 single-chip microcomputer module U1.

As shown in fig. 7, the USB-serial port conversion circuit 21 is a USB-to-serial port chip CH340, for example, U11, and the USB port of the USB-to-serial port chip CH340 is connected to the USB interface, and the serial port of the USB-to-serial port chip CH340 is connected to the first UART port of the low-power consumption main control module 30. Therefore, the USB-to-serial circuit supports serial communication through the USB-to-serial chip CH340, establishes data connection with the upper computer, and the upper computer can read the message sent by the MCU through the serial tool.

In this embodiment, the UART-RS485 conversion circuit 22 includes an RS485 interface circuit and a first level conversion chip, where the RS485 interface circuit is connected with a second UART port of the low power consumption main control module 30 through the first level conversion chip, and an RS485B/RS485A interface is led out from the port for directly communicating with the RS485 communication device. The RS485 interface circuit is connected with the UART2 end of the main control chip by adopting a level conversion chip, and an external interface RS485B/RS485A is led out from the port, so that the communication with RS485 communication equipment can be directly realized.

In this embodiment, the UART-RS232 conversion circuit 23 includes an RS232 interface circuit and a second level conversion chip, where the RS232 interface circuit is connected to a third UART port of the low power consumption main control module 30 through the level conversion chip, and an RS232_tx/RS232_rx interface is led out from the port for directly communicating with the RS232 communication device. It can be seen that the RS232 interface circuit is connected to the UART3 end of the main control chip by using a level conversion chip, and an external interface RS232 TX/RS232 RX is led out from the port, so that the RS232 interface circuit can directly communicate with the RS232 communication device.

In this embodiment, the CAN signal conversion circuit 24 includes a CAN interface circuit and a third level conversion chip, the CAN interface circuit converts an external CAN signal into a TTL level signal through the third level conversion chip, the low power consumption main control module 30 is connected with the third level conversion chip through the CAN1_rx and the CAN1_tx, and an interface end of the CAN interface circuit is connected with an ohmic resistor and leads out a CANH/CANL interface at the interface end for directly communicating with the CAN device. The CAN interface circuit converts an external CAN signal into a TTL level signal by adopting a level conversion chip, the main control chip is connected with the level conversion chip through CAN1 RX and CAN1 TX, and a 120 ohm resistor is added at an interface end according to the standard, so that an external interface CANH/CANL is led out, and the external interface CANH/CANL CAN be directly communicated with CAN equipment.

As shown in fig. 8, the memory includes a qspi_flash chip U4, and the low power consumption main control module 30 controls a clock signal of the qspi_flash chip U4 through a qspi_clkpin and controls read/write signals of the qspi_flash chip U4 through a qspi_io0 pin and a qspi_io1 pin. Therefore, in the aspect of a memory, a QSPI_FLASH chip is adopted for storage, a main control chip controls a clock signal through QSPI_CLK, and QSPI_IO0 and QSPI_IO1 control read-write signals. In addition, the gateway supports the storage of the SD card, and the main control chip realizes DATA transmission through SDMC_CLK control clock signals, SDMC_CMD control read-write direction signals and SDMC_DATA 0.

Specifically, the 5G NB-IoT-based general wireless gateway device provided in the present embodiment mainly includes a built-in battery, an interface conversion module 20, a low-power consumption main control module 30, a 5G NB-IoT module 40, a power conversion module U6, and the like. The low-power-consumption main control module 30 adopts an STM32L series low-power-consumption processor for controlling and managing an external module, and a real-time operating system is supported in the low-power-consumption main control module to improve the operation reliability, such as STM32L431RCT series, and voltage can be timely adjusted according to different application requirements when the microprocessor operates, so that dynamic balance of power consumption is realized, and the performance is ensured and the power consumption is reduced. And it is the lowest cost of the same type. RTOS is supported, system instantaneity is improved, system APIs can be directly used, and development difficulty is reduced; the 5G NB-IoT module 40 adopts a remote BC95-CNV communication module, the BC95-CNV provided by a remote company is a high-performance and low-power-consumption multi-band LTE Cat NB2 wireless communication module, LCC encapsulation which is easier to weld is adopted, and the remote BC-CNV wireless communication module supports a Quectol enhanced AT instruction, ultra-low power consumption and ultra-high sensitivity; the interface conversion module 20 supports GPIO, I2C, SPI, CAN, RS485 and RS432 commonly used in industry; the lithium battery is powered, and a charging and discharging module is built in, so that the low-power consumption main control module 30, the 5G NB-IoT module 40 and other peripheral circuit devices can be powered simultaneously.

As shown in fig. 3, the gateway is provided with 2 pieces of rechargeable lithium batteries with the capacity of 9250mWh to supply stable power to the gateway. Under the support of the power interface module, multiple designs such as a constant current/constant voltage linear charging chip, a current limiting and circuit protecting chip and the like are adopted, so that the hardware safety is improved. The battery voltage is boosted and output into the system 5V voltage through the boosting chip, and then the system 3.3V voltage is output through the step-down chip to be provided for the main control chip and other peripheral circuits. Wherein, the RS485 level conversion chip and the CAN conversion chip adopt VCC power supply and reserve 5V power supply at the same time. The RS232 level conversion chip, the CH340 level conversion chip, the BC95-CNV chip, the SD-CARD drive circuit and the internal QSPI_FLASH memory chip are powered by a 3.3V power supply.

Furthermore, the universal wireless gateway device can be connected to the charging module through the USB to charge the battery and simultaneously supply power to the CPU, so that the service time of the device is prolonged, and the gateway has two working modes of fixing and moving.

Thus, based on 5G NB-IoT technology, devices have great advantages in terms of transmission rate and device portability over 2G/3G while maintaining low power consumption. Based on the characteristics of wide coverage and large connection, the access quantity of the terminal equipment and the network coverage are greatly improved. The 5G NB-IoT gateway also has a chargeable power supply, can work normally even under the condition of power shortage, is suitable for various complex environments, supports a heartbeat keep-alive mechanism of 5G NB-IoT large connection, and has a disconnection rate of less than 1% in 7 x 24 hours under the normal signal condition. In addition, the problem of the singleness of the traditional gateway is solved on the interface, and the gateway also supports most common interface protocols, such as: SPI, I2C, RS485, CAN, RS232, etc.

In practical application, the 5G NB-IoT gateway hardware layout size is 9.5cm by 6cm, and is divided into a TOP layer and a BOTTOM by adopting a 2-layer board design. The TOP layer is used for wiring, devices such as a core main control interface, a BC-95 module and the like are mainly placed, the BOTTOM layer is mainly used for placing a power module, and other devices are conveniently placed nearby according to functions and wiring. The critical signal traces follow the impedance matching and equal length requirements.

Therefore, the utility model adopts the low-power consumption control chip, the NB module and the power supply to integrate integrally, has lower power consumption, realizes longer endurance in limited hardware resources, has better safety and reliability, improves the product performance under the condition of reducing the power consumption, and widens the use of 5G NB-IoT. Meanwhile, the interface protocol supported by the existing gateway is relatively single, most of industrial transmission protocols are supported on a hardware system, a low-power control chip is used as a core component, other network modules are connected through standard extensible interfaces, information exchange between other networks is established in a bus mode, and an NB (radio access point) IoT (Internet of things) module is used for communication with an Internet of things platform through an NB base station, so that the application scene and the application range of the product are enlarged, the reliability is higher, and the application scene and the application range are wider.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims

1. A 5 GNB-IoT-based generic wireless gateway device, comprising:

the system comprises a power management module, an interface conversion module, a low-power-consumption main control module, a memory and a 5GNB-IoT module, wherein the memory is connected with the low-power-consumption main control module, the power management module is used for providing power for each functional unit of the wireless gateway device, managing a power supply mode and battery state information, the 5GNB-IoT module is connected to the low-power-consumption main control module through a serial port, the low-power-consumption main control module transmits data to the 5GNB-IoT module through an LPUART interface, and the 5GNB-IoT module establishes wireless communication with an internet of things platform through an NB base station;

2. The universal wireless gateway device of claim 1, wherein:

the device also comprises a CAN signal conversion circuit, wherein a first interface of the CAN signal conversion circuit is connected with a CAN port of the low-power-consumption main control module, and a second interface of the CAN signal conversion circuit is connected with a CAN bus.

3. The universal wireless gateway device of claim 2, wherein:

the UART-RS485 conversion circuit comprises an RS485 interface circuit and a first level conversion chip, wherein the RS485 interface circuit is connected with a second UART port of the low-power-consumption main control module through the first level conversion chip, and an RS485B/RS485A interface is led out from the port and used for directly communicating with RS485 communication equipment.

4. A universal wireless gateway device according to claim 3, wherein:

the UART-RS232 conversion circuit comprises an RS232 interface circuit and a second level conversion chip, wherein the RS232 interface circuit is connected with a third UART port of the low-power-consumption main control module through the level conversion chip, and an RS 232-TX/RS 232-RX interface is led out from the port and used for directly communicating with RS232 communication equipment.

5. The universal wireless gateway device of claim 4, wherein:

the CAN signal conversion circuit comprises a CAN interface circuit and a third level conversion chip, wherein the CAN interface circuit converts an external CAN signal into a TTL level signal through the third level conversion chip, the low-power-consumption main control module is connected with the third level conversion chip through CAN1 RX and CAN1 TX, the interface end of the CAN interface circuit is connected with an ohmic resistor, and a CANH/CANL interface is led out from the interface end and used for directly communicating with CAN equipment.

6. The universal wireless gateway device of claim 5, wherein:

the USB-serial port conversion circuit is a USB-to-serial port chip CH340, a USB port of the USB-to-serial port chip CH340 is connected with a USB interface, and a serial port of the USB-to-serial port chip CH340 is connected with a first UART port of the low-power-consumption main control module.

7. The universal wireless gateway device according to any of claims 1 to 6, wherein:

the low-power consumption main control module comprises an STM32L431 single-chip microcomputer module.

8. The universal wireless gateway device of claim 7, wherein:

the 5GNB-IoT module is a BC95-CNV communication module, a USIM pin of the BC95-CNV communication module is connected with an SD card circuit, and a NB pin of the BC95-CNV communication module is connected with a NB pin of the STM32L431 singlechip module.

9. The universal wireless gateway device according to any of claims 1 to 6, wherein:

the memory comprises a QSPI_FLASH chip, the low-power-consumption main control module controls a clock signal of the QSPI_FLASH chip through a QSPI_CLK pin and controls read-write signals of the QSPI_FLASH chip through a QSPI_IO0 pin and a QSPI_IO1 pin.

10. The universal wireless gateway device according to any of claims 1 to 6, wherein:

the power management module comprises a battery module and a power conversion module, wherein the battery module comprises at least 2 large-capacity rechargeable lithium batteries and is used for providing stable power supply for the wireless gateway device; the power conversion module boosts and outputs the voltage of the rechargeable lithium battery to 5V voltage of a system through the boosting chip, and outputs the 3.3V voltage of the system through the step-down chip so as to provide the voltage for the low-power-consumption main control module and other peripheral circuits.