Low-power-consumption intelligent carbon dioxide detector based on LORA wireless communication

Abstract

The utility model discloses a low-power-consumption intelligent carbon dioxide detector based on LORA wireless communication, which comprises an LORA SOC control unit, a power conversion circuit, a carbon dioxide sensor module, a wireless LORA radio frequency circuit, an address setting circuit and a reset circuit, the LORA SOC control unit is in signal connection with the power conversion circuit, the carbon dioxide sensor module, the wireless LORA radio frequency circuit, the address setting circuit and the reset circuit, the power conversion circuit provides a power supply for the whole detector and manages the power supply, and the wireless LORA radio frequency circuit is in wireless connection with the controller terminal. The device is simple in structure, the wireless communication technology and the lithium battery power supply technology are used, so that the device is convenient to install and use, wiring consumables are reduced, and the construction cost is saved; meanwhile, the maintenance period of a customer is shortened through the modularized design of the equipment gas sensor; the equipment sends a wireless signal to the control terminal in real time, and the ventilation device is intelligently and automatically controlled to be opened, closed and switched between high speed and low speed.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide detectors, in particular to a low-power intelligent carbon dioxide detector based on LORA wireless communication. Background Art

[0002] At room temperature, carbon dioxide is a colorless, odorless, non-flammable gas. It is produced during the burning of fossil fuels and biological respiration. It easily accumulates in confined spaces and can cause dizziness, confusion, shortness of breath, loss of consciousness, and even death from suffocation at unsafe concentration levels. By monitoring the carbon dioxide content in the air to control the operation of ventilation or air exchange equipment, the above situation can be avoided, and energy waste caused by excessive ventilation or air exchange can also be avoided. At the same time, reducing the carbon dioxide content in indoor air can also lower indoor temperatures and reduce the load on air conditioning equipment, thereby further saving energy.

[0003] Most of the carbon dioxide monitoring equipment on the market is connected by wires. For the intelligent upgrading and transformation of the project, it is necessary to lay the wiring in advance, which increases the project cost and construction period. The WIFI and 4G networking requires telecom operators to provide additional network equipment. The networking is not flexible and fast enough, and it wastes resources for the transmission of small amounts of data. At the same time, it increases energy consumption and does not meet the low-carbon energy-saving concept required by the development of today's society. On the other hand, during the working process, the sensor needs to be calibrated regularly as its sensitivity and zero point change. However, when the customer performs later maintenance, the environment and equipment conditions for calibration are not available, and the entire device needs to be sent back to the manufacturer for processing, which is not efficient and fast enough. Utility Model Content

[0004] The purpose of the utility model is to provide a low-power intelligent carbon dioxide detector based on LORA wireless communication to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-power intelligent carbon dioxide detector based on LORA wireless communication, comprising a LORA SOC control unit, a power conversion circuit, a carbon dioxide sensor module, a wireless LORA radio frequency circuit, an address setting circuit and a reset circuit, wherein the LORA SOC control unit is respectively connected to the power conversion circuit, the carbon dioxide sensor module, the wireless LORA radio frequency circuit, the address setting circuit and the reset circuit signals, the power conversion circuit provides power for the entire detector and manages the power supply, and the wireless LORA radio frequency circuit is wirelessly connected to the controller terminal.

[0006] Preferably, the LORA SOC control unit adopts a single-chip integrated ARM M4 core and LORA IP core.

[0007] Preferably, the wireless LORA radio frequency circuit is composed of a radio frequency antenna and a radio frequency switch.

[0008] Preferably, the address setting circuit is provided with a device address number.

[0009] Preferably, the carbon dioxide sensor module is composed of a carbon dioxide detection unit and a low-power microcontroller.

[0010] Preferably, the carbon dioxide detection unit adopts a digital sensor based on the principle of non-dispersive infrared (NDIR), with built-in temperature compensation, and a low-power microcontroller using APM32F003x4 / x6 series chips, embedded with 32K bytes of Flash and 4K bytes of SRAM, and the communication interfaces include: 1 I2C interface, 1 SPI interface, and 3 USART interfaces.

[0011] Preferably, the power conversion circuit is composed of a power management chip and a rechargeable lithium battery as a power source.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The simple structure and the use of wireless communication technology and lithium battery power supply technology make the equipment easy to install and use, reduce wiring consumables, and save construction costs; at the same time, the modular design of the equipment's gas sensor saves customers' maintenance cycle; the equipment sends wireless signals to the control terminal in real time to perform intelligent automatic control of the ventilation device to open, close, and switch between high and low speeds, achieving fast, efficient, and energy-saving control, reducing labor cost investment, and improving the reliability, stability, and feasibility of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal functional modules of the SOC chip of the utility model.

[0016] In the figure: 1. LORA SOC control unit; 2. Power conversion circuit; 3. Carbon dioxide sensor module; 4. Wireless LORA radio frequency circuit; 5. Address setting circuit; 6. Reset circuit; 7. Controller terminal. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2 The utility model provides a technical solution: a low-power intelligent carbon dioxide detector based on LORA wireless communication, including a LORA SOC control unit 1, a power conversion circuit 2, a carbon dioxide sensor module 3, a wireless LORA radio frequency circuit 4, an address setting circuit 5 and a reset circuit 6. The LORA SOC control unit 1 is respectively connected to the power conversion circuit 2, the carbon dioxide sensor module 3, the wireless LORA radio frequency circuit 4, the address setting circuit 5 and the reset circuit 6 by signal. The power conversion circuit provides power for the entire detector and manages the power supply. The wireless LORA radio frequency circuit 4 is wirelessly connected to a controller terminal 7. The wireless communication technical solution adopts the LORA method, the wireless communication protocol adopts a private protocol, and has a LORA wireless signal transmission anti-collision CAD detection mechanism, which can greatly reduce the data packet loss caused by signal channel conflicts and improve the communication quality.

[0019] In the utility model, the LORA SOC control unit 1 adopts a single-chip integrated ARM M4 core and a LORA IP core to replace the traditional LORA radio frequency chip + MCU combination solution. Its peripheral circuit is simple and the circuit design is more miniaturized. While meeting the equipment design requirements, it has lower power consumption and stronger anti-interference ability.

[0020] In the utility model, the wireless LoRa radio frequency circuit 4 is composed of a radio frequency antenna and a radio frequency switch, and the signals of the RF antenna port are respectively input into the LoRa SOC control unit 1; the LoRa SOC control unit 1 uses the built-in LoRa IP core to send and receive wireless signals and communicate with the controller terminal 7.

[0021] In the present invention, the address setting circuit 5 is provided with a device address number for distinguishing different devices, which can be identified by the controller terminal during wireless signal transmission, and the implementation method is completed by dialing a code switch.

[0022] In the present invention, the reset circuit 6 is used for device reset, and is used when the device address is changed or when the wireless network needs to be re-established.

[0023] In the utility model, the carbon dioxide sensor module 3 is composed of a carbon dioxide detection unit and a low-power microcontroller, and the carbon dioxide detection unit and the calibration data are modularized. When the sensor sensitivity decreases, the zero drifts, the life expires or is accidentally damaged, the customer only needs to replace the carbon dioxide sensor module 3, without the need to replace the entire device or calibrate the carbon dioxide detection unit. The carbon dioxide detection unit adopts a digital sensor based on the principle of non-dispersive infrared (NDIR), with built-in temperature compensation and serial port output, which can simplify the design of the carbon dioxide sensor module 3 as a whole. Compared with electrochemical and catalytic combustion type sensors, the sensor has a long service life, excellent long-term stability, a wide temperature range, does not require oxygen to participate in the reaction, is resistant to water vapor interference, is not poisoned, and has low maintenance costs. The low-power microcontroller uses the APM32F003x4 / x6 series chip, with 32K bytes of Flash and 4K bytes of SRAM embedded, and the communication interface includes: 1 I2C interface, 1 SPI interface, and 3 USART interfaces, which can meet the communication between the carbon dioxide detection unit and the LORA SOC control unit 1, and store calibration data at the same time.

[0024] The carbon dioxide sensor module 3 monitors the carbon dioxide concentration in the current environment in real time, and sends the data to the LORASOC control unit 1 for processing. If it is detected that the current environmental carbon dioxide concentration exceeds the set alarm value, the alarm signal will be sent to the controller terminal 7 through the wireless LORA radio frequency circuit 4, and the controller terminal 7 will receive it and control the ventilation device to work. When the LORA SOC control unit 1 collects the output signal of the carbon dioxide sensor module 3 in real time, the LORA SOC control unit 1 will start the communication detection program at a fixed time. When the communication connection between the carbon dioxide sensor module 3 and the LORA SOC control unit 1 is abnormal, the LORA SOC control unit 1 will control the wireless radio frequency circuit 4 in real time to report the fault information to the controller terminal 7 for fault reminder. Through these circuits and control programs, the detector has a certain degree of intelligence, realizing the wireless remote intelligent monitoring and maintenance work in the background.

[0025] In the utility model, the power conversion circuit 2 is composed of a power management chip and a rechargeable lithium battery as a power source. At the same time, the LORA SOC control unit 1 can collect lithium battery power information, and then send the data to the controller terminal 7 through the wireless LORA radio frequency circuit 4.

[0026] The utility model is a low-power product powered by a lithium battery. The following measures are taken in design to achieve low power consumption: 1) Select low-power devices. The MCU of the LORA SOC control unit 1 can select a low-power processor with a sleep current of uA level and cooperate with the software algorithm to make the overall average power consumption of the LORA SOC control unit 1 <20uA; the power chip in the power conversion circuit 2 uses a high-efficiency, low-power step-up and step-down DC-DC adjustment chip CS5517T, which has a stable operating current of 8uA. Its boost function can solve the problem that when the battery voltage drops to the critical protection voltage of the lithium battery 2.9~3V, it can still provide the system with a stable operating voltage through the boost function, thereby maximizing the use of battery power, thereby extending the use time of the utility model.

[0027] The communication scheme of the utility model detector adopts LoRa wireless communication technology, which has a long communication distance, strong penetration ability in buildings, low power consumption, and does not require telecommunications operators to authorize the use of frequency bands and provide additional network equipment, and is flexible in networking; the low-power technology is used in the design of the equipment hardware and software, so that the equipment can be powered by rechargeable lithium batteries, with a long power supply life, while saving construction and cable costs, bringing convenience to on-site construction and later maintenance; the utility model detector adopts a modular design, and the customer does not need to calibrate it by himself in the later stage, and only needs to replace the sensor detection module part, which makes maintenance more convenient and efficient. At the same time, the shell of the utility model is made of ABS material, which has the advantages of flame retardancy, corrosion resistance, small size, light weight, and little effect on wireless signal attenuation; the RF antenna is built into the product and welded to the PCB, and there is no need to connect an external antenna to the outside, making the product appearance neater and more beautiful.

[0028] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the utility model have been shown and described, it is understandable to those of ordinary skill in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A low-power intelligent carbon dioxide detector based on LORA wireless communication, characterized in that: The invention comprises a LoRa SOC control unit (1), a power conversion circuit (2), a carbon dioxide sensor module (3), a wireless LoRa radio frequency circuit (4), an address setting circuit (5) and a reset circuit (6); the LoRa SOC control unit (1) is respectively connected to the power conversion circuit (2), the carbon dioxide sensor module (3), the wireless LoRa radio frequency circuit (4), the address setting circuit (5) and the reset circuit (6) by signals; the power conversion circuit (2) provides power for the entire detector and manages the power; the wireless LoRa radio frequency circuit (4) is wirelessly connected to a controller terminal (7).

2. A low-power intelligent carbon dioxide detector based on LORA wireless communication according to claim 1, characterized in that: The LoRa SOC control unit (1) uses a single chip to integrate an ARM M4 core and a LoRa IP core.

3. A low-power intelligent carbon dioxide detector based on LORA wireless communication according to claim 1, characterized in that: The wireless LORA radio frequency circuit (4) is composed of a radio frequency antenna and a radio frequency switch.

4. A low-power intelligent carbon dioxide detector based on LORA wireless communication according to claim 1, characterized in that: The address setting circuit (5) is provided with a device address number.

5. A low-power intelligent carbon dioxide detector based on LORA wireless communication according to claim 1, characterized in that: The carbon dioxide sensor module (3) is composed of a carbon dioxide detection unit and a low-power microcontroller.

6. A low-power intelligent carbon dioxide detector based on LORA wireless communication according to claim 5, characterized in that: The carbon dioxide detection unit adopts a digital sensor based on the principle of non-dispersive infrared (NDIR), with built-in temperature compensation. The low-power microcontroller uses the APM32F003x4 / x6 series chip, embedded with 32K bytes of Flash and 4K bytes of SRAM, and the communication interfaces include: 1 I2C interface, 1 SPI interface, and 3 USART interfaces.

7. A low-power intelligent carbon dioxide detector based on LORA wireless communication according to claim 1, characterized in that: The power conversion circuit (2) is composed of a power management chip and a rechargeable lithium battery as a power source.

Images