CN215453283U

CN215453283U - NB-IoT-based fixed asset management device

Info

Publication number: CN215453283U
Application number: CN202121370602.8U
Authority: CN
Inventors: 杨倩倩
Original assignee: Anhui Xinyilian Intelligent Technology Co ltd
Current assignee: Anhui Xinyilian Intelligent Technology Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2022-01-07
Anticipated expiration: 2031-06-18

Abstract

The utility model discloses a fixed asset management device based on NB-IoT, which comprises a battery, a voltage conversion circuit, an MCU, an NB-IoT wireless communication module, a temperature and humidity sensor and an RFID module, wherein the NB-IoT wireless communication module is connected with the MCU; the NB-IoT wireless communication module comprises a main communication chip and an SIM card connector connected with the main communication chip; the battery is connected with the MCU, the NB-IoT wireless communication module, the temperature and humidity sensor and the RFID module through the voltage conversion circuit respectively. The utility model can actively report the fixed asset information by utilizing the NB-IoT wireless communication module, thereby avoiding the process of manually reading and processing the information, reducing the occurrence of human errors and greatly improving the management efficiency of the fixed asset.

Description

NB-IoT-based fixed asset management device

Technical Field

The utility model relates to the field of fixed asset management, in particular to a fixed asset management device based on NB-IoT.

Background

At present, fixed asset management is mostly in a human processing stage, or related technologies using RFID. Even with RFID technology, human passivity is required to read device information.

In the existing wireless communication mode, narrowband Internet of Things (NB-IoT) is constructed in a cellular network, only a bandwidth of about 180KHz is consumed, a License frequency Band is used, and three deployment modes such as in-Band deployment, guard Band deployment or independent carrier wave deployment can be adopted to coexist with the existing network. The method can be directly deployed in a GSM network, a UMTS network or an LTE network so as to reduce the deployment cost and realize smooth upgrading.

NBIOT is characterized as follows:

(1) super-strong coverage: compared with GPRS, the signal gain of 20db is increased.

(2) Ultra-low power consumption: the targets for terminal power consumption are: based on AA (5000mAh) batteries, the service life can exceed 10 years.

3) Ultra-large connection: one sector can support tens of thousands of connections, and support low delay sensitivity, ultra-low equipment cost, low equipment power consumption and optimized network architecture.

4) And (3) ultra-low cost: NB-IoT requires no re-networking and both radio frequency and antenna are essentially multiplexed.

It is therefore desirable to provide a new type of NB-IoT based fixed asset management device to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a fixed asset management device based on NB-IoT, which can actively report fixed asset information and improve the management efficiency of fixed assets.

In order to solve the technical problems, the utility model adopts a technical scheme that: the fixed asset management device based on the NB-IoT comprises a battery, a voltage conversion circuit, an MCU, an NB-IoT wireless communication module, a temperature and humidity sensor and an RFID module, wherein the NB-IoT wireless communication module is connected with the MCU;

the NB-IoT wireless communication module comprises a main communication chip and an SIM card connector connected with the main communication chip;

the battery is connected with the MCU, the NB-IoT wireless communication module, the temperature and humidity sensor and the RFID module through the voltage conversion circuit respectively.

In a preferred embodiment of the present invention, the battery is connected to the voltage conversion circuit through a switch.

In a preferred embodiment of the utility model, the voltage conversion circuit adopts an SGM2019-3.3V voltage stabilization chip.

In a preferred embodiment of the present invention, the temperature and humidity sensor employs SHT20, and the sensor can detect a low battery state and output a checksum, which is helpful for improving the reliability of communication.

In a preferred embodiment of the present invention, the primary communication chip adopts BC26, which is an NB-IoT wireless communication module with high performance and low power consumption.

The utility model has the beneficial effects that: the utility model can actively report the fixed asset information by utilizing the NB-IoT wireless communication module, thereby avoiding the process of manually reading and processing the information, reducing the occurrence of human errors and greatly improving the management efficiency of the fixed asset.

Drawings

FIG. 1 is a block diagram of the NB-IoT based fixed asset management apparatus of the present invention;

FIG. 2 is a circuit diagram of the voltage conversion circuit;

FIG. 3 is a circuit diagram of the MCU;

FIG. 4 is a circuit diagram of the temperature and humidity sensor;

fig. 5 is a circuit diagram of the NB-IoT wireless communication module;

fig. 6 is a circuit diagram of the RFID module.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.

Referring to fig. 1, an embodiment of the present invention includes:

a fixed asset management device based on NB-IoT comprises a battery, a voltage conversion circuit, an MCU, an NB-IoT wireless communication module connected with the MCU, a temperature and humidity sensor and an RFID module. The NB-IoT wireless communication module comprises a main communication chip and an SIM card connector connected with the main communication chip; the battery is respectively connected with the MCU, the NB-IoT wireless communication module, the temperature and humidity sensor and the RFID module through the voltage conversion circuit to supply power to the MCU, the NB-IoT wireless communication module, the temperature and humidity sensor and the RFID module.

The battery adopts 1 section of 2000mA lithium battery and is responsible for providing power for the whole system. Further, the battery is connected with the voltage conversion circuit through a switch. After the equipment is bound with fixed resources, the switch can be turned on to provide power for the whole system.

With reference to fig. 2, the voltage conversion circuit converts the battery voltage into 3.3V and other voltages by using an SGM2019-3.3V voltage stabilization chip, and the voltages are used by the MCU, the NB-IoT wireless communication module, the temperature and humidity sensor, and the RFID module. The voltage stabilizing chip and components and connection relation of the voltage stabilizing chip and peripheral circuits are shown in the figure.

With reference to FIG. 3, the MCU employs GD32E230 series GD32E230C8T6, the GD32E230 series being based on

A 32 bit general purpose microcontroller for the core. The MCU and the components and the connection relation of the peripheral circuits thereof and the pins connected with the modules are shown in the figure. Providing high performance while providing a very low gate count. For MCU and embedded applications with compact design requirements, the processor provides high power efficiency through a small and powerful instruction set and a large number of optimization designs, and high-end processing hardware, including 1 single-cycle multiplier and 1 17-cycle divider, thus providing high energy efficiency.

GD32E230C8T6 device integration

The 32-bit processor core of (1), the core runs at a frequency of up to 72MHz and has 0-2 wait states of flash memory access permissions to achieve maximum efficiency. GD32E230C8T6 provides built-in flash up to 64KB and SRAM up to 8 KB. And an enhanced I/O port which can be connected with two APB buses and various on-chip peripherals are supported. This series of MCUs provides 1 12-bit ADC and 1 comparator, 5 general 16-bit timers, 1 basic timer, 1 PWM advanced timer and standard and advanced communication interfaces: up to 2 SPI, 2I²C, 2 USARTs and 1I²S。

The MCU is powered by a power supply of 1.8V to 3.6V and can work within the temperature range of-40 ℃ to 85 ℃. The series provides three power saving modes with sufficient flexibility to maximize the optimization between wake-up latency and power consumption, which is also a particularly important consideration in low power applications.

With reference to fig. 4, the temperature and humidity sensor is mainly used for detecting the environment and humidity of an asset, and is more for the asset management of major fixed instruments, and these devices have strict requirements on the working environment, and if the temperature and humidity are not suitable, the instruments may be damaged. Preferably, the temperature and humidity sensor adopts SHT20, and a new generation of Sensirion humidity and temperature sensor establishes a new standard in terms of size and intelligence: it embeds a dual row flat no-lead DFN package suitable for reflow soldering, bottom 3x3mm, height 1.1 mm. The temperature and humidity sensor and the components and the connection relationship of the peripheral circuits are shown in the figure. Sensor output calibrated digital signal, Standard I²And C format. With an entirely new design of SHT20

The performance of the chip, an improved capacitive humidity sensor element and a standard bandgap temperature sensor element has greatly improved or even exceeded the reliability level of the previous generation sensors (SHT1x and SHT7 x). The resolution of the SHT20 can be changed by the input command (RH/T of 8/12bit or even 12/14 bit), the sensor can detect the low battery condition, and the checksum is output, contributing to the reliability of the communication.

With reference to fig. 5, the primary communication chip in the NB-IoT wireless communication module adopts BC26, which is a high-performance and low-power-consumption NB-IoT wireless communication module. The size of the module is only 17.7 x 15.8 x 2.0, the requirement of terminal equipment on small-size module products can be met to the maximum extent, and meanwhile, the module effectively helps customers to reduce the product size and optimize the product cost. BC26 adopts LCC encapsulation of being easier to weld, can realize the quick production of module through standard SMT equipment, provides reliable connected mode for the customer, is particularly suitable for automatic, large-scale, low-cost modernized production mode. The SMT patch technology also enables the BC95 to have high reliability to meet application requirements in complex environments. By virtue of compact size, ultra-low power consumption and ultra-wide working temperature range, the BC26 becomes an ideal choice for the M2M application field, and is often used in wireless meter reading, smart cities, security protection, asset tracking, intelligent household appliances, agriculture, environment monitoring and other industries to provide perfect short message and data transmission services.

In the default state, NB-IoT has three operating states, which can be switched according to different configuration parameters, and the three operating states are as follows:

(1) connected (Connected state):

the module is in the state after being registered and accessed to the network, can send and receive data, can enter an Idle mode after no data interaction exceeds a period of time, and can be configured in time.

(2) Idle (Idle state):

the receiving downlink data can enter a Connected state, the PSM mode can be entered when no data interaction exceeds a period, and the time can be configured.

(3) PSM (power save mode):

in this mode, the terminal closes the transceiver and does not monitor paging of the wireless side, so that although the terminal is still registered in the network, signaling cannot be reached, downlink data cannot be received, and power is low.

NBIOT is well suited for asset management given its low cost, low power consumption, and high performance. Fig. 5 shows a circuit component of the main communication chip and the SIM card connector connected thereto, and a connection relationship thereof.

The RFID module is mainly used for identifying an object to achieve the purpose of managing fixed assets, and a circuit diagram thereof is shown in fig. 6.

The utility model can actively report the fixed asset information by utilizing the NB-IoT wireless communication module, thereby avoiding the process of manually reading and processing the information, reducing the occurrence of human errors and greatly improving the management efficiency of the fixed asset.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A fixed asset management device based on NB-IoT is characterized by comprising a battery, a voltage conversion circuit, an MCU, an NB-IoT wireless communication module connected with the MCU, a temperature and humidity sensor and an RFID module;

2. The NB-IoT based fixed asset management device of claim 1, wherein the battery is connected to the voltage conversion circuit through a switch.

3. The NB-IoT based fixed asset management device according to claim 1, wherein the voltage conversion circuit employs an SGM2019-3.3V voltage regulation chip.

4. The NB-IoT based fixed asset management device according to claim 1, wherein the temperature and humidity sensor employs SHT 20.

5. The NB-IoT based fixed asset management device in accordance with claim 1, wherein the primary communication chip employs BC 26.