Low-power-consumption pressure acquisition unit based on wireless transmission technology

Abstract

The utility model discloses a low-power-consumption pressure acquisition unit based on a wireless transmission technology, and belongs to the technical field of pressure acquisition. The problem that in the prior art, a traditional low-power-consumption pressure acquisition unit is difficult to transmit data due to the installation position of a valve is solved. The system comprises a monitoring system and a low-power-consumption pressure acquisition unit, wherein a data transmission unit comprises a power switch control module, an internal FLASH storage module, a lithium battery power supply module, an MCU (Microprogrammed Control Unit) main control module and a Lora470M wireless communication module; the monitoring system is connected with the Lora470M wireless communication module, the Lora470M wireless communication module is connected with the MCU main control module, and the MCU main control module is connected with the low-power-consumption pressure acquisition unit, the power switch control module and the internal FLASH storage module. The utility model improves the installation and maintenance efficiency of the pressure acquisition unit, can be applied to pipeline heat supply pressure acquisition, and meets the requirements of wireless transmission of pressure values.

Description

Technical Field

[0001] The utility model relates to a low-power consumption pressure acquisition unit, in particular to a low-power consumption pressure acquisition unit based on wireless transmission technology, belonging to the technical field of pressure acquisition. Background Art

[0002] At present, the common low-power pressure acquisition units on the market generally adopt wired power supply and wired communication methods, such as CAN bus and RS85 bus methods, which are used in conjunction with other main valve equipment. When installing the low-power pressure acquisition unit, a DC24V DC power supply is required to power it, and the communication between the low-power pressure acquisition unit and the host is three-core or two-core wired communication; due to the special installation location of the on-site low-power pressure acquisition unit, such as in sewer pipes, sewage pipes, underground garages, and building pipes, and most of the installation locations are on the first or second floor near the window of the residential unit door, a very long communication line needs to be connected between the valve and the data transmission unit. If the low-power pressure acquisition unit is installed in a trench, it is also necessary to dig grooves on the surface to bury pipes and thread the wires, which brings great difficulties and construction costs to on-site construction. When the communication line breaks in the future, it is difficult to find the fault point, which also brings great difficulties to subsequent maintenance.

[0003] In summary, a low-power pressure acquisition unit with convenient data transmission and based on wireless transmission technology is needed. Utility Model Content

[0004] The following is a brief overview of the present invention to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important aspects of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description discussed later.

[0005] In view of this, in order to solve the problem in the prior art that traditional low-power pressure acquisition units are difficult to transmit data due to the valve installation position, the utility model provides a low-power pressure acquisition unit based on wireless transmission technology.

[0006] The technical solution is as follows: a low-power pressure acquisition unit based on wireless transmission technology, including a control system and a data transmission unit;

[0007] The control system includes a monitoring system and a low-power pressure acquisition unit;

[0008] The data transmission unit includes a power switch control module, an internal FLASH storage module, a lithium battery power supply module, an MCU main control module and a Lora470M wireless communication module;

[0009] The monitoring system is connected to the Lora470M wireless communication module, the Lora470M wireless communication module is connected to the MCU main control module, and the MCU main control module is connected to the low-power pressure acquisition unit, the power switch control module and the internal FLASH storage module respectively.

[0010] Furthermore, the MCU main control module is an MCU main control module using the HC32L196KCAT chip.

[0011] Furthermore, the internal FLASH storage module is an internal FLASH storage module using an HC32L196KCA chip.

[0012] Furthermore, the Lora470M wireless communication module is a Lora470M wireless communication module using the WH-L101-L chip.

[0013] Furthermore, the low-power pressure acquisition unit is a low-power pressure acquisition unit using a JHM1203 chip.

[0014] Furthermore, the lithium battery power supply module is a lithium battery power supply module using an XC6220B331MR-G chip.

[0015] Furthermore, the power switch control module is a power switch control module that adopts a combination of a CJ1012 chip and a CJ2307 chip.

[0016] Furthermore, a low-power pressure collection unit based on wireless transmission technology also includes a shell and an antenna. The shell is provided with a charging interface and an antenna interface. The antenna is fixed to the outside of the shell through the antenna interface. The data transmission unit is provided inside the shell and is connected to the antenna.

[0017] The beneficial effects of the present invention are as follows: the present invention provides a low-power pressure acquisition unit based on wireless transmission technology, which controls the Lora470M wireless communication module and the low-power pressure acquisition unit through the MCU main control module to collect pressure values ​​in real time. At the same time, the MCU main control module transmits the collected data to the monitoring system through the Lora470M wireless communication module, which solves the problem of data communication failure due to the valve installation position, effectively improves the installation and maintenance efficiency of the low-power pressure acquisition unit, reduces the on-site construction difficulty and saves construction costs for enterprises, and makes future maintenance easier; the MCU main control module used in the present invention is a low-power type CPU, and under static standby adjustment, the working current is about 25uA. Under normal circumstances, a 4.2V lithium battery can be used to power it for 4-6 years; the present invention effectively improves the regulation efficiency of the heating pressure, can solve the extensive management of the heating enterprise, and greatly improves the intelligent management of the entire heating system; this The utility model greatly reduces the difficulty of on-site pressure collection networking communication. There is no need for networking wiring between the on-site pressure unit and the data transmission unit, and the valve position can be installed at will. The utility model reduces future maintenance costs. Since the valve and the data transmission unit adopt the Lora470M wireless communication module for wireless communication, the risk of communication line damage and disconnection is completely solved. The control unit of the utility model adopts a high-performance microprocessor, that is, an MCU main control module equipped with an HC32L196KCAT chip and a low-power Lora470M wireless communication module, which saves power consumption and has strong anti-interference ability, and can ensure the long-term stable operation of the equipment. The utility model has a remote control working mode and can be controlled by issuing instructions through the monitoring system. The utility model can analyze the heating strategy through the monitoring system and issue effective adjustment commands, thereby improving the intelligent management of heating users. The utility model is simple and convenient to install without wiring, and can be powered by a power supply or a battery, which reduces construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 This is a structural diagram of a low-power pressure acquisition unit based on wireless transmission technology;

[0020] Figure 2 This is a structural diagram of the power switch control module;

[0021] Figure 3 This is a structural diagram of the lithium battery power supply module;

[0022] Figure 4This is a structural diagram of the MCU main control module;

[0023] Figure 5 This is a schematic diagram of the structure of the Lora470M wireless communication module;

[0024] Figure 6 It is a structural diagram of a low-power pressure acquisition unit;

[0025] Figure 7 Schematic diagram of the shell structure.

[0026] Figure numbers: 1. Monitoring system; 2. Low-power pressure acquisition unit; 3. Power switch control module; 4. Internal FLASH storage module; 5. Lithium battery power supply module; 6. MCU main control module; 7. Lora470M wireless communication module; 8. Top cover; 9. Antenna interface; 10. M20 threaded interface; 11. Bottom cover. DETAILED DESCRIPTION

[0027] In order to make the embodiments and advantages of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, and are not an exhaustive list of all embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other unless there is a conflict.

[0028] In this utility model, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; and internal communication between two electrical components or interaction between two electrical components. Those skilled in the art will understand the specific meanings of the above terms in this utility model according to specific circumstances.

[0029] refer to Figure 1 、 Figure 2 This embodiment is described in detail. A low-power pressure acquisition unit based on wireless transmission technology includes a control system and a data transmission unit;

[0030] The control system includes a monitoring system 1 and a low-power pressure acquisition unit 2;

[0031] The data transmission unit includes a power switch control module 3, an internal FLASH storage module 4, a lithium battery power supply module 5, an MCU main control module 6 and a Lora470M wireless communication module 7;

[0032] The monitoring system 1 is connected to the Lora470M wireless communication module 7, the Lora470M wireless communication module 7 is connected to the MCU main control module 6, and the MCU main control module 6 is connected to the low-power pressure acquisition unit 2, the power switch control module 3 and the internal FLASH storage module 4 respectively;

[0033] Specifically, in this embodiment, the monitoring system 1 is connected to the cloud platform. The monitoring system 1 sends a query instruction 01, indicating that the low-power pressure acquisition unit 2 receives the read pressure value. The low-power pressure acquisition unit 2 regularly transmits the pressure value to the monitoring system 1 according to the set reporting cycle. The monitoring system 1 then transmits the collected pressure data to the cloud platform for storage and subsequent analysis.

[0034] The power switch control module 3 is connected to the MOS tube through the IO port of the MCU main control module 6, that is, the central processing unit. The IO port of the MCU main control module 6 outputs high and low levels, thereby controlling the switch of the 3.3V power output end (power supply POWER_OUT port). The purpose is to ensure that in low power mode, the device has no power input and reduces power consumption;

[0035] The switching functions of the MOS tube are as follows: 1. High controllability: By adjusting the gate voltage, the conductive channel of the MOS tube can be precisely controlled to achieve fine adjustment of the current, thereby realizing highly controllable switching operation; 2. Low power consumption: In static conditions, the MOS tube basically consumes no power and only requires a short energy supply when switching, making it widely used in electronic devices, especially in scenarios with low power consumption requirements; 3. Fast response: Due to the structure and principle of the MOS tube, its switching speed is very fast and can complete the switching operation at the nanosecond level, making it suitable for high-frequency electronic equipment and communication systems; the switching start condition of the MOS tube is: when the MCU main control module 6 gives a high level, the MOS tube switch is turned on;

[0036] The internal FLASH storage module 4 is used to store the configuration data of each valve in real time. The configuration data will not be lost after power failure, and the number of erase and write times is up to 1 million times.

[0037] The Lora470M wireless communication module 7 adopts the most popular Lora technology, with long signal communication distance and strong wall penetration ability. Through the 470MHZ wireless fixed-point communication mode of Lora technology, the address and channel are specified to interact with the valve. Before each communication, the Lora470M wireless communication module 7 will send a fixed-duration wake-up code to wake up the valve for interaction.

[0038] The lithium battery power supply module 5 is used to power the Lora470M wireless communication module 7 and the low-power pressure acquisition unit 2; the low-power pressure acquisition unit 2 is used to collect pressure data collected by the device in real time;

[0039] The power switch control module 3 is used to ensure that the data transmission unit has an extremely low operating current (about 25uA) in the static working mode.

[0040] Furthermore, the MCU main control module 6 is an MCU main control module using the HC32L196KCAT chip;

[0041] Specifically, the MCU main control module 6 has super low power consumption. When using an external low-speed clock (32.768KHZ), the power consumption is 5uA. The internal FLASH storage module 4 is the internal FLASH configured for the MCU main control module 6; the MCU main control module 6 includes a first decoupling capacitor C8 and a second decoupling capacitor C9. The decoupling capacitor of the microcontroller pin plays a very important role in circuit design. Its main function is to eliminate or reduce the noise and voltage fluctuations on the microcontroller pin to ensure the stable operation of the microcontroller. The decoupling capacitor is usually placed between the power pin and the ground pin of the microcontroller to form a low-impedance power supply loop to reduce the impact of power supply noise on the microcontroller. In addition, the decoupling capacitor can also provide transient current to meet the current required by the microcontroller during fast switching, thereby avoiding the reduction of the power supply voltage; the MCU main control module 6 also includes a reset circuit composed of a ninth resistor R9 and a fifteenth capacitor C15.

[0042] Furthermore, the internal FLASH storage module 4 is an internal FLASH storage module using a HC32L196KCA chip.

[0043] Furthermore, the Lora470M wireless communication module 7 is a Lora470M wireless communication module using a WH-L101-L chip;

[0044] Specifically, when the Lora470M wireless communication unit 7 receives and sends data, it is configured through AT commands to enter low power consumption mode; the WH-L101-L chip has high anti-interference and stability, its operating frequency band is 410Mhz-525Mhz (the default frequency is 470Mhz), the operating range is 1.9V-3.7V, and the minimum sleep current for point-to-point use is only 2.5uA. It can support point-to-point and be used with LoRa gateways, and has TTL level output; the WH-L101-L chip has higher anti-interference, stability, and a longer transmission distance, and integrates three communication protocols into one, supports point-to-point, and is used with USR-LG210-L and USR-LG220-L gateway communications. One module is suitable for multiple scenarios; the WH-L101-L chip supports relay data transmission, and can perform multi-module relay transmission for ultra-long-distance wireless data transmission, multi-device relay use, and long-distance transmission can reach 6000 meters, transmission power 22dBm±0.5dBm, receiving sensitivity can reach -140dBm@0.268Kbps; the WH-L101-L chip monitors LoRa signals, which can display the signal quality during data transmission and whether there is interference in the used frequency band, ensuring device transmission stability; the WH-L101-L chip has an LBT function, which detects channel environment interference noise before sending data. When noise is detected, it delays transmission to prevent channel conflicts and ensure the success rate of device data communication; the WH-L101-L chip has four power consumption modes: RUN\WU\LR\LSR ​​mode, and the power consumption in LSR mode is about 2.5uA; the WH-L101-L chip also has a watchdog function to prevent module downtime and abnormalities, and can quickly restart and recover. The hardware operating range is -40℃-+85℃, the mechanical dimensions are 26.65x18.22x2.60mm, and it adopts SMT patch package.

[0045] Furthermore, the low-power pressure acquisition unit 2 is a low-power pressure acquisition unit using a JHM1203 chip;

[0046] Specifically, the low-power pressure acquisition unit 2 adopts the JHM1203 chip. The JHM1203 chip is a high-precision signal conditioning chip designed for differential signals. It has rich internal resources and integrates a pre-PGA, a 24-bit analog-to-digital converter, a temperature sensor, a digital processor and a memory. At the same time, the JHM1203 chip is designed for low-power applications, with an operating current of less than 0.6mA and a standby current of less than 0.1uA. The JHM1203 chip integrates a variety of compensation algorithms, through which the original value of the collected signal can be digitally compensated, including the zero-point deviation, sensitivity deviation and nonlinear deviation of the signal. The coefficients of the compensation algorithm are saved in the one-time programmable memory (OTP) integrated on the chip and can still be maintained after power failure. The compensated data is output by the JHM1203 chip through the IIC interface. In this embodiment, the pressure source adopts a four-wire design, and the four-wire sensor uses two signal lines to transmit the signal. The reason is to improve the stability and Accuracy, that is, when two signal lines are used to transmit signals, if one of the signal lines is interfered with or damaged, the other signal line can still work normally, thereby avoiding interruption or error in signal transmission; the JMH1203 chip uses a four-wire connection method to input the pressure data of the pressure sensor through the second relay J2, and the amplifier uses an OPA337UA instrument amplifier or an ordinary operational amplifier to form a differential amplifier to form an operational amplifier circuit. Only one external resistor, the fourteenth resistor R14, is needed to set the amplification gain G, G = (100KΩ / R14) + 1, and the set amplification gain G = 11 is obtained. In addition, the sixteenth capacitor C16 and the nineteenth capacitor C19 form a filtering circuit. The operational amplifier circuit amplifies the collected pressure data and transmits it to the JMH24-bit ADC digital chip. The ADC module transmits the converted analog pressure data to the MCU main control module 6 through IIC communication after digital conversion. At the same time, the tenth resistor R10 and the thirteenth resistor R13 form a voltage divider circuit to provide working voltage for the operational amplifier circuit.

[0047] Furthermore, the lithium battery power supply module 5 is a lithium battery power supply module using an XC6220B331MR-G chip;

[0048] Furthermore, the power switch control module 3 is a power switch control module that adopts a combination of a CJ1012 chip and a CJ2307 chip.

[0049] Furthermore, a low-power pressure collection unit based on wireless transmission technology also includes a shell and an antenna. The shell adopts a flip-top waterproof shell, and the shell is provided with a charging interface and an antenna interface. The antenna is fixed to the outside of the shell through the antenna interface by a threaded connection. The data transmission unit is arranged inside the shell, and the data transmission unit and the antenna are connected by an antenna adapter cable.

[0050] A low-power pressure acquisition unit based on wireless transmission technology works as follows: the lithium battery power supply module 5 provides power, and the MCU main control module 6 initializes the entire system after power-on, that is, performs a series of initialization configurations such as address, channel, working mode, etc. on the Lora470M wireless communication module 7, and performs function initialization configuration on the related resources used; first, the low-power pressure acquisition unit 2, active reporting cycle, local address, local channel and other information automatically stored before the system is powered off are read from the internal FLASH storage module 4, and the MCU main control module 6 drives the low-power pressure acquisition unit 2 to collect current pressure data. When the timing time is greater than the active reporting cycle, the low-power pressure acquisition unit 2 will actively output the current pressure data to the real-time receiving monitoring system 1. After receiving the data, the monitoring system 1 transmits all the data of the low-power pressure acquisition unit 2 to the cloud platform in real time; finally, the Lora470M wireless communication module 7 automatically enters low-power mode;

[0051] refer to Figure 7 The upper cover 8 of the shell has a diameter of 68cm, the antenna interface 9 has a diameter of 25cm, the M20 threaded interface 10 has a height of 13mm-18mm, the M20 threaded interface 10 is connected to other devices, and the lower cover 11 has a diameter of 68mm.

[0052] Although the present invention has been described in terms of a limited number of embodiments, it will be apparent to those skilled in the art, having benefit of the foregoing description, that other embodiments are contemplated within the scope of the invention thus described. Furthermore, it should be noted that the language used in this specification has been selected primarily for readability and didactic purposes, rather than for the purpose of explaining or limiting the subject matter of the invention. Consequently, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive of the scope of the invention, which is defined by the appended claims.

Claims

1. A low-power pressure acquisition unit based on wireless transmission technology, characterized in that: Including control system and data transmission unit; The control system comprises a monitoring system (1) and a low-power pressure acquisition unit (2); The data transmission unit comprises a power switch control module (3), an internal FLASH storage module (4), a lithium battery power supply module (5), an MCU main control module (6) and a Lora470M wireless communication module (7); The monitoring system (1) is connected to the Lora470M wireless communication module (7), the Lora470M wireless communication module (7) is connected to the MCU main control module (6), and the MCU main control module (6) is respectively connected to the low-power pressure acquisition unit (2), the power switch control module (3) and the internal FLASH storage module (4).

2. The low-power pressure acquisition unit based on wireless transmission technology according to claim 1, characterized in that: The MCU main control module (6) is an MCU main control module using an HC32L196KCAT chip.

3. The low-power pressure acquisition unit based on wireless transmission technology according to claim 2, characterized in that: The internal FLASH storage module (4) is an internal FLASH storage module using an HC32L196KCA chip.

4. The low-power pressure acquisition unit based on wireless transmission technology according to claim 3, characterized in that: The Lora 470M wireless communication module (7) is a Lora 470M wireless communication module using a WH-L101-L chip.

5. The low-power pressure acquisition unit based on wireless transmission technology according to claim 4, characterized in that: The low-power pressure acquisition unit (2) is a low-power pressure acquisition unit using a JHM1203 chip.

6. The low-power pressure acquisition unit based on wireless transmission technology according to claim 5, characterized in that: The lithium battery power supply module (5) is a lithium battery power supply module using an XC6220B331MR-G chip.

7. The low-power pressure acquisition unit based on wireless transmission technology according to claim 6, characterized in that: The power switch control module (3) is a power switch control module that adopts a combination of a CJ1012 chip and a CJ2307 chip.

8. The low-power pressure acquisition unit based on wireless transmission technology according to claim 7, characterized in that: It also includes a shell and an antenna. The shell is provided with a charging interface and an antenna interface. The antenna is fixed to the outside of the shell through the antenna interface. The data transmission unit is provided inside the shell and is connected to the antenna.

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