Compressed hydrogen on-line calibration data acquisition control system of hydrogen hydrogenation machine

Abstract

The utility model discloses an online calibration data acquisition control system for compressed hydrogen of a hydrogen hydrogenation machine. A digital acquisition board is respectively connected with an upper computer, an external power supply, a mass flowmeter, a hydrogen alarm, a temperature sensor and a pressure sensor; the digital acquisition board is provided with three acquisition current loops which are respectively connected with a hydrogen alarm, a temperature sensor and a pressure sensor, and is also provided with two Modbus communication lines which are respectively connected with an upper computer and a mass flow meter. The components work cooperatively so as to realize real-time data acquisition, transmission, processing and control functions. On-site on-line application of a standard meter method hydrogen adding machine calibration method is supported, and the 24-bit resolution can ensure the transmission precision. The metering accuracy of a standard device of a standard meter method is superior to 0.8%; the pressure grade is 35 Mpa; the flow range is 0 to 3.6 kg / min; the explosion-proof grade is more than Ex d IIC T4, and the device is suitable for a hydrogen coupling area; and the working power supply is 220V AC (Alternating Current).

Description

Technical Field

[0001] The utility model belongs to the technical field of verification or calibration of instrument equipment for measuring capacity, flow, liquid level or volumetric measurement in IPC classification G01F25 / 00, and in particular relates to a structural innovation and improvement technology of a data acquisition control management integrated module system for online calibration of compressed hydrogen operation applied to hydrogenation machines. Background Art

[0002] As a new type of energy, hydrogen energy produces only water as the product of its oxidation combustion and has a high unit calorific value. It has the characteristics of diverse sources, clean and low-carbon, flexible and efficient. It can help to absorb renewable energy on a large scale, achieve large-scale peak regulation of the power grid and cross-seasonal and cross-regional energy storage. It can be widely used in energy, transportation, industry, construction and other fields.

[0003] As the basic infrastructure for supplying hydrogen to fuel cell vehicles, hydrogen refueling stations are mainly composed of hydrogen production systems, compression systems, storage systems, filling systems and control systems. The hydrogen refueling machine is the core working equipment of the hydrogen refueling station. The hydrogen refueling machine is a special equipment that fills hydrogen into gas storage containers and has metering and pricing devices. It includes mass flow meters, electronic controllers, quick shut-off valves, hydrogen refueling guns, etc.

[0004] The GB / T 31138-2014 Compressed Hydrogen Refueling Machine for Automobiles standard specifies the mass method hydrogen refueling machine measurement accuracy test method. Hydrogen refueling machines need to be regularly inspected or calibrated using other inspection methods such as the standard table method.

[0005] Patent application 202010255830.4 discloses an online calibration device and method for the metering performance of a hydrogenation machine, including a hydrogenation machine, a static mass method device, and a data acquisition and processing mechanism. The hydrogenation machine includes a display screen, an intake valve group, a pressure gauge, and a mass flow meter. The intake valve group is connected to a gas source, and the intake valve group, the pressure gauge, and the mass flow meter are connected in sequence. The measurement principle is based on the law of conservation of mass, and an electronic scale is used as the measurement standard, making it possible to directly trace the flow value of the hydrogenation machine to the mass value of the electronic scale.

[0006] CN110726459A discloses an on-site calibration device for a hydrogenator, comprising a computer, a high-pressure pipeline, a pressure gauge, a solenoid valve, a stop valve, a flow sensor and a flow transmitter. A hydrogenation gun interface is provided at one end of the high-pressure pipeline, and a gas cylinder interface is provided at the other end. The flow sensor, the pressure gauge, the solenoid valve and the stop valve are arranged on the high-pressure pipeline between the hydrogenation gun interface and the gas cylinder interface. The flow sensor is electrically connected to the flow transmitter, and the computer is simultaneously connected to the flow transmitter and the hydrogenation amount display module signal of the hydrogenator. The computer can compare and analyze the actual hydrogenation amount sent by the flow transmitter with the hydrogenation gas amount displayed by the hydrogenation amount display module of the hydrogenator and determine whether the measurement of the hydrogenator is accurate.

[0007] The currently disclosed technologies lack standard calibration equipment that can conduct traceability calibration by mass method at the hydrogenation site. Utility Model Content

[0008] The technical problem to be solved by the utility model is that in view of the above-mentioned problem and technical demand of the lack of standard calibration devices that can be calibrated online at the hydrogenation work site, the utility model proposes a hydrogenation machine compressed hydrogen online calibration data acquisition and control system, which is responsible for data acquisition and control during the hydrogenation machine compressed hydrogen online calibration process. It needs to be able to collect various sensor data in real time and accurately, such as pressure, temperature, flow, etc., and perform corresponding processing and analysis to ensure accurate calibration and safe operation of the hydrogenation machine.

[0009] To this end, the utility model includes: a host computer, an external power supply, a digital acquisition board, a mass flow meter, a hydrogen alarm, a temperature sensor and a pressure sensor. The digital acquisition board is respectively connected to the host computer, the external power supply, the mass flow meter, the hydrogen alarm, the temperature sensor and the pressure sensor; wherein, the digital acquisition board is provided with three acquisition current loops respectively connected to the hydrogen alarm, the temperature sensor and the pressure sensor, and two communication bus Modbus communication lines are also provided respectively connected to the host computer and the mass flow meter.

[0010] The three acquisition current loops are 4-20 mA current loops and are commonly connected to a corresponding analog-to-digital conversion chip with three inputs.

[0011] The communication bus is a two-way Modbus485 communication line, wherein one Modbus485 communication line is connected to the mass flow meter to collect flow signals, and the other Modbus485 communication line is connected to the host computer for signal communication. The communication bus uses the Modbus485 communication mode of 1 host with 2 slaves, the host computer is the host, and the mass flow meter and the digital acquisition board are both slaves.

[0012] The digital acquisition board is installed in the explosion-proof box, and the power supply and communication between the mass flow meter, hydrogen alarm, temperature sensor and pressure sensor and the explosion-proof box and the digital acquisition board therein are connected in a cluster through explosion-proof hoses; the explosion-proof protection master controller of the ZXF8030-A1K1 380V 10A model is selected in the explosion-proof box; the digital acquisition board communicates with the host computer and the external power connection interface through a four-core explosion-proof aviation plug as a line connection device, and the four-core explosion-proof plug is an AC-32 380 32A explosion-proof aviation plug, which complies with Ex d IIB T6 Gb. The processor on the main function module is STM32F103C8T6.

[0013] The digital acquisition board is installed in an explosion-proof box. The power supply and communication between the mass flow meter, hydrogen alarm, temperature sensor and pressure sensor and the explosion-proof box and the digital acquisition board therein are connected in a cluster through explosion-proof hoses. The explosion-proof protection master controller of the ZXF8030-A1K1 380V 10A model is selected in the explosion-proof box. The digital acquisition board communicates with the host computer and the external power connection interface through a four-core explosion-proof aviation plug as a line connection device. The four-core explosion-proof aviation plug is an AC-32 380 32A explosion-proof aviation plug that complies with Ex d IIB T6 Gb. The digital acquisition board is designed as a two-layer board structure, and the size of the digital circuit board is designed to be 120mm*180mm.

[0014] Furthermore, a chip L78M05 is provided on the power module to convert 12V into 5V DC, and at the same time, an XL6019E1 is provided on the power module to boost the 12V to 24V, and a chip 1117-3.3 is provided on the power module to convert 5V into 3.3V.

[0015] Compared with the prior art, the beneficial effects of the utility model are: setting up a connection between the host computer and the mass flow meter, and using a three-way current loop for digital acquisition of temperature and pressure sensors, as well as a hydrogen alarm device. Supporting on-site online application of the standard table hydrogenation machine calibration method, the 24-bit resolution can ensure transmission accuracy. The optional cyclic redundancy check (CRC) in data input, data output and register mapping can ensure communication integrity. Ensure detection convenience, meet the needs of on-site use of hydrogen, the needs of large current loops and explosion-proof requirements, and have a wide dynamic range, low power consumption and specific functions for electric energy measurement. Minimize interference with digital circuits, short traceability chains, fewer intermediate links and uncertainty factors, and conveniently and accurately allocate and use processor resources to achieve high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following drawings are for illustration only and should not be construed as limiting the present invention in any way. By referring to the following drawings, readers can understand the embodiments of the present invention and further understand the advantages and technical features of the present invention.

[0017] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model.

[0018] Figure 2 This is a schematic diagram of the circuit connection structure of an embodiment of the utility model.

[0019] Figure 3 The figure is a schematic diagram of the circuit structure of the analog-to-digital conversion module in the embodiment of the utility model.

[0020] Figure 4 The figure is a schematic diagram of the circuit structure of the Modbus transceiver module in the embodiment of the utility model. DETAILED DESCRIPTION

[0021] It should be noted that:

[0022] The terms "comprise", "comprises", "having" and any variations thereof are intended to cover other possible options under the same logic that are not listed. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatus.

[0023] In the description of the present utility model, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In order to enable those skilled in the art to better understand the scheme of the utility model, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only an embodiment of a part of the utility model, rather than all the embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by ordinary technicians in the field to which the utility model belongs. When there is a conflict, the definitions in this specification shall prevail.

[0027] According to the functions to be realized, the system of the utility model needs to include multiple important components, such as a central controller unit, a sensor interface, a data acquisition module, a data processing module, a communication module, etc. These components work together to realize the real-time data acquisition, transmission, processing and control functions. Among them:

[0028] (1) Data acquisition: Various sensors are connected through the sensor interface to collect various data of the hydrogenation machine during operation, such as hydrogen pressure, temperature, flow rate, etc. These data are the basis for subsequent processing and analysis.

[0029] (2) Data transmission: The collected data is transmitted to the central controller unit in real time through the communication module. The communication module may support multiple communication protocols to ensure accurate and efficient data transmission.

[0030] (3) Data processing and analysis: The central controller unit processes and analyzes the received data, such as filtering, denoising, conversion, etc., to extract useful information. This information is used to monitor the operating status of the hydrogenation machine and provide a basis for subsequent calibration and control.

[0031] (4) Control output: Based on the results of data processing and analysis, the central controller unit generates corresponding control instructions to control the operation of the hydrogenation machine through the output interface. These instructions may include adjusting the parameter settings of the hydrogenation machine, starting or stopping certain functions, etc., to ensure the accurate calibration and safe operation of the hydrogenation machine.

[0032] The utility model is based on the principle of hydrogenation verification, in that the system also needs to be designed to collect various parameters of temperature sensors, pressure sensors, hydrogen alarm devices and mass flow meters, including connection structures of various functional modules and connection structures of signal acquisition and communication.

[0033] The utility model is also based on the working principle and connection structure of the online calibration data acquisition control system for compressed hydrogen in the hydrogenator, and further designs a core data acquisition board structure involving an integrated control circuit for use in the system, so as to quickly and accurately collect parameters of various instruments in the hydrogenation calibration device, and summarize and transmit them to the host computer control software.

[0034] The utility model comprises: a host computer, an external power supply, a digital acquisition board, a mass flow meter, a hydrogen alarm, a temperature sensor and a pressure sensor.

[0035] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0036] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

[0037] The content of the present invention can be more easily understood by selecting the following preferred implementation methods and embodiments of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by ordinary technicians in the field to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0038] Example: As attached Figure 1 As shown, the digital acquisition board is connected to the host computer, external power supply, mass flow meter, hydrogen alarm, temperature sensor and pressure sensor respectively. Among them, there are three acquisition current loops on the digital acquisition board, which are connected to the hydrogen alarm, temperature sensor and pressure sensor respectively, and two communication bus Modbus communication lines are also set to connect the host computer and mass flow meter respectively.

[0039] In the above, the three-way current acquisition loop is a 4-20mA current loop.

[0040] In the above, the communication bus is two Modbus485 communication lines, wherein one Modbus485 communication line is connected to the mass flow meter to collect flow signals, and the other Modbus485 communication line is connected to the host computer for signal communication.

[0041] In the embodiment of the utility model, the overall circuit design framework of the digital acquisition board is shown in the attached Figure 2As shown, the digital acquisition board is equipped with a power interface, a host computer interface, a power module, a main function module, a communication bus, a communication function module, a hydrogen alarm interface, a pressure communication interface, a temperature communication interface and a flow meter communication interface. The power interface is connected to the power module, and the power module is connected to the main function module and the communication function module at the same time. The main function module is connected to the communication function module. At the same time, the communication function module is connected to the host computer interface and the flow meter communication interface through the communication bus. The communication function module is connected to the hydrogen alarm interface, the pressure communication interface, and the temperature communication interface through three current loops to collect the working signal data of the hydrogen alarm, the temperature sensor and the pressure sensor, that is, the current signal is converted into a voltage signal using a high-precision resistor, and then the voltage signal is converted into a digital signal through the analog-to-digital conversion chip, and then transmitted to the core processor of the main function module for conversion.

[0042] Among them, the external power supply is connected to the power supply interface, and the external power supply is a DC 12V input power supply, but the mass flow meter and hydrogen alarm, as well as the temperature sensor and the temperature transmitter or pressure transmitter of the pressure sensor are powered by DC 24V. The operating voltage of the main function module and the communication function module chip on the remaining digital acquisition boards is 3.3V and 5V, including the communication bus Modbus communication requires a DC 5V power supply, so the power module is required to transform the external power input power supply. For this reason, the chip L78M05 is set on the power module to convert 12V to 5V DC, and the XL6019E1 is set on the power module to boost the voltage, boosting the 12V to 24V. The chip 1117-3.3 is also required on the power module to convert 5V to 3.3V. The 3.3V power supply will power the MCU, ADC and other chips. XL6019 E1 is a monolithic integrated circuit designed for boosting and buck-boosting. It can work in the DC5V to 40V input voltage range, has low ripple, built-in power MOS, and the maximum 5A switching current fully meets the use requirements of this device.

[0043] Among them, the three-way current collection loop is commonly connected to the corresponding analog-to-digital conversion chip with three inputs. The ADS131M03 analog-to-digital conversion chip is preferred. The ADS131M03 is a three-channel, synchronous sampling, 24-bit, Δ-Σ analog-to-digital converter (ADC) with a wide dynamic range, low power consumption and specific functions for electric energy measurement. The device integrates a low drift, 1.2V reference, reducing the area of ​​the printed circuit board (PCB). The optional cyclic redundancy check (CRC) in the data input, data output, and register mapping can ensure communication integrity. The ADS131M03 analog-to-digital conversion chip has a 24-bit resolution and can ensure transmission accuracy. For the specific analog-to-digital conversion circuit of the ADS131M03 analog-to-digital conversion chip, please refer to the attached Figure 3 shown.

[0044] Among them, the digital acquisition board only needs to provide one Modbus interface to connect to the communication bus. The communication bus uses Modbus485 communication as a working mode of 1 host with 2 slaves. The host computer is the host, and the mass flow meter and the digital acquisition board are both slaves. Therefore, the digital acquisition board only needs to provide one Modbus interface. Because only one Modbus transceiver is needed, the MAX485CPA chip is selected as the communication bus Modbus transceiver chip. The chip's transceiver enables automatic switching of NPN transistors. The specific communication bus circuit including the MAX485CPA chip as the Modbus transceiver module is shown in the attached figure. Figure 4 shown.

[0045] Among them, the processor of the main function module is STM32F103C8T6. Based on the above requirements, this processor needs one SPI interface and one UART serial port interface as peripheral interfaces. M32F103C8T6 is based on ARM 32-bit Cortex TM -M3 core, the voltage range is 2.0V~3.6V, and the operating frequency can reach up to 72MHz. The processor operating frequency is set to the default 8MHz. The main function of the processor is to collect and convert three-way 4~20mA current loop data storage. The serial port adopts the form of serial port interrupt. Because the data acquisition board is a serial port slave, there is no need to actively send data. It only needs to communicate with the host computer to read the data and make an immediate reply. The baud rate of the mass flow meter is 38400, and the device address is 1. The communication parameters of the data acquisition board are the same as those of the mass flow meter, with a baud rate of 38400. To distinguish it from the mass flow meter, the address of the digital acquisition board device is set to 2.

[0046] In the embodiment of the utility model, in order to meet the explosion-proof requirements, the digital acquisition board adopts a flameproof design and is installed in an explosion-proof box. Preferably, the digital circuit board is installed in an explosion-proof box. The power supply and communication between the mass flow meter, hydrogen alarm, temperature sensor and pressure sensor and the explosion-proof box and the digital acquisition board therein are bundled and connected through explosion-proof hoses, so that the explosion-proof design of the entire system device can meet the requirements of use in a hydrogen environment. The ZXF8030-A1K1 380V10A explosion-proof protection master controller is selected in the explosion-proof box. The explosion-proof specification of the explosion-proof protection master controller is Ex d eIIC T6 Gb, which meets the requirements for on-site use of hydrogen.

[0047] In the embodiment of the utility model, the size of the digital acquisition board needs to meet the size of the installation hole of the explosion-proof protection master controller. Therefore, the size of the digital circuit board is designed to be 120mm*180mm as required. The digital acquisition board is designed as a two-layer board, which can be covered with a large amount of copper to meet the needs of large current loops and minimize interference with digital circuits.

[0048] In the embodiment of the utility model, the digital acquisition board and explosion-proof box in the system communicate with the host computer and the external power connection interface. It is necessary to use a two-core communication and two-core power equipment that can simultaneously bundle and accommodate power and communication lines. After comprehensive consideration, only a four-core explosion-proof aviation plug is needed as the first choice for line connection. Preferably, the four-core explosion-proof aviation plug is an AC-32 380 32A explosion-proof aviation plug, which complies with Ex d IIB T6 Gb.

[0049] In the embodiment of the utility model, the digital acquisition board needs to collect various parameters of the temperature sensor, pressure sensor, hydrogen alarm device and mass flow meter. The digital acquisition board quickly and accurately collects the parameters of various instruments for hydrogenation calibration, summarizes them and transmits them to the host computer for control and management through a four-core explosion-proof aviation transmission.

[0050] In the embodiment of the utility model, the main technical indicators of the system include: the measurement accuracy of the standard meter method standard device is better than 0.8%; the pressure level is 35Mpa; the flow range is 0-3.6kg / min; the explosion-proof level is Ex d IIC T4 or above, suitable for areas where hydrogen occasionally occurs; the working power supply is 220V AC.

[0051] In the embodiment of the utility model, the digital circuit board is a printed circuit board (PCB), which is the core component of the system equipment of the utility model. It carries various electronic components and connects the electronic components together according to the circuit principle through a pre-designed conductive path, thereby realizing the function of the electronic device. The digital acquisition board is mainly composed of an insulating board substrate, a conductive pattern and a pad. The insulating board substrate provides a stable support for the circuit board, and the conductive pattern and the pad are responsible for realizing the electrical connection between the electronic components.

[0052] Based on the above embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention, so as to avoid exhaustively listing all implementation methods that are unnecessary and impossible to list comprehensively.

Claims

1. A data acquisition and control system for online calibration of hydrogen compressed by a hydrogenation machine, comprising: a host computer, an external power supply, a digital acquisition board, a mass flow meter, a hydrogen alarm, a temperature sensor and a pressure sensor; characterized in that: The digital acquisition board is respectively connected to the host computer, external power supply, mass flow meter, hydrogen alarm, temperature sensor and pressure sensor; wherein, there are three acquisition current loops respectively connected to the hydrogen alarm, temperature sensor and pressure sensor on the digital acquisition board, and two communication bus Modbus communication lines are respectively connected to the host computer and the mass flow meter.

2. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 1, characterized in that: The three-way current acquisition loop is a 4-20mA current loop.

3. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 1, characterized in that: The communication bus is a two-way Modbus485 communication line, wherein one Modbus485 communication line is connected to the mass flow meter to collect flow signals, and the other Modbus485 communication line is connected to the host computer for signal communication.

4. The online calibration data acquisition and control system for compressed hydrogen in a hydrogenation machine according to claim 1, characterized in that: The digital acquisition board is equipped with a power interface, a host computer interface, a power module, a main function module, a communication bus, a communication function module, a hydrogen alarm interface, a pressure communication interface, a temperature communication interface and a flow meter communication interface; the power interface is connected to the power module, the power module is connected to the main function module and the communication function module at the same time, the main function module is connected to the communication function module, and at the same time, the communication function module is connected to the host computer interface and the flow meter communication interface through the communication bus, and the communication function module is respectively connected to the hydrogen alarm interface, the pressure communication interface, and the temperature communication interface through three current loops.

5. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 4, characterized in that: The power module is provided with a chip L78M05 to convert 12V into 5V DC. Meanwhile, the power module is provided with a chip XL6019E1 to boost the voltage, thereby boosting 12V to 24V. The power module is provided with a chip 1117-3.3 to convert 5V into 3.3V.

6. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 4, characterized in that: The three acquisition current loops are commonly connected to a corresponding analog-to-digital conversion chip with three inputs.

7. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 4, characterized in that: The communication bus uses Modbus485 communication in the working mode of 1 host and 2 slaves, the upper computer is the host, and the mass flow meter and digital acquisition board are both slaves.

8. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 4, characterized in that: The processor selected on the main function module is STM32F103C8T6.

9. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 4, characterized in that: The digital acquisition board is installed in an explosion-proof box. The power supply and communication between the mass flow meter, hydrogen alarm, temperature sensor and pressure sensor and the explosion-proof box and the digital acquisition board therein are clustered and connected through explosion-proof hoses. The ZXF8030-A1K1 380V 10A explosion-proof protection master controller is selected in the explosion-proof box. The digital acquisition board communicates with the host computer and the external power connection interface through a four-core explosion-proof aviation plug as a line connection device. The four-core explosion-proof aviation plug is an AC-32 380 32A explosion-proof aviation plug, which complies with Ex d IIB T6 Gb.

10. The online calibration data acquisition and control system for hydrogenation machine compressed hydrogen according to claim 4, characterized in that: The digital acquisition board is designed as a two-layer board structure, and the size of the digital circuit board is designed to be 120mm*180mm.

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