CN202304874U - Thermotechnical type energy efficiency data acquisition terminal - Google Patents

Abstract

The utility model relates to a thermal energy efficiency data collection terminal. The terminal includes a microprocessing module MCU, a data storage module, a power supply module and an RS485 interface module; the microprocessing module MCU is connected with a signal sampling module, including a chip clock module and an AD conversion module The data storage module is bidirectionally connected to the microprocessing module; the power supply module supplies power to the microprocessing module MCU; the RS485 interface module, the micropower wireless module and the PLC carrier communication module are respectively bidirectionally connected to the microprocessing module MCU. The utility model has strong anti-interference and high reliability; it solves the problem of data collection and transmission of thermal energy efficiency, realizes cluster deployment, collection of multiple data types, transmission of multiple interfaces, etc. amount of collection. In addition, the terminal also takes into account the needs of different working environments, such as the communication mode can also use micro-power wireless, PLC and other signal transmission methods, and leave an expansion interface for the future intelligent control of the master station.

Description

A Thermal Energy Efficiency Data Acquisition Terminal

technical field

The utility model relates to an electrical instrument, in particular to a thermal energy efficiency data collection terminal.

Background technique

The rapid development of the energy-saving industry has put forward extremely high requirements for basic technologies. Perfect, rich and accurate basic data are the prerequisite for promoting the overall healthy development of the energy-saving industry and the key to evaluating the effects of all energy-saving technologies. The current confusion of various energy-saving data and energy-efficiency information has brought many potential hidden dangers to the energy-saving industry. Therefore, it is urgent to establish a unified energy efficiency data collection center to obtain comprehensive energy-saving service industry data, provide data support and technical support for the development of the energy-saving industry, monitor energy-saving projects and evaluate energy-saving service agencies, and provide decision-making support for energy conservation.

Accurate energy efficiency basic data mainly depends on on-site real-time collection, including electricity and non-electricity data, which need to be collected and transmitted by a dedicated collection terminal. There are many thermal quantities such as flow, temperature, humidity, and pressure in the actual site, and these thermal quantities are important factors for evaluating energy efficiency. It is urgent to develop a collection terminal for real-time collection of thermal quantities that meets the requirements of industrial sites and energy efficiency monitoring.

Patent application number 200920069055.2 discloses a wireless data acquisition terminal, which includes a radio frequency identification module, a main control module and a wireless communication module. The utility model can realize wireless collection and wireless transmission of data, and has the characteristics of strong real-time performance, wide application range, large transmission capacity of the system and the like.

The patent with the application number 200920236498.6 discloses a collection terminal for a centralized meter reading system for low-voltage power users, which includes a main controller, a storage module, a remote update module, a carrier modulation module, a power supply module and an RS485 interface module. The purpose of the utility model The purpose is to provide a collection terminal for a centralized meter reading system for low-voltage power users that can be operated on a master station to realize remote system update.

The patent with application number 200920279096.4 discloses a collection terminal for power management system. The collection terminal includes a pulse port and a communication unit for data communication with the handset. It also includes an RS485 interface, and the RS485 interface fits on the pulse port. The technical scheme provided by the utility model is convenient for deployment and expansion, improves collection efficiency, and further improves the efficiency of electric quantity collection and transmission in the electric quantity management system.

The patent with the application number 201020214236.2 discloses a special transformer collection terminal equipped with a modular communication module, which is used to collect electric energy information of special transformer users. The terminal includes a display screen, a main board, a communication interface and wiring terminals. A remote communication module and a signal expansion interface module are installed on the main board. The remote communication module is connected to the remote terminal interface on the main board through the base board, and a signal receiver is installed on the base board. This patent designs the solidified remote communication module and signal expansion interface module in each special variable acquisition terminal in the prior art as a plug-in module, and formulates a unified pin, so that various communication methods can be replaced arbitrarily. It greatly reduces the user replacement cost and construction difficulty.

The inventor has found through long-term painstaking research that although the above-mentioned prior art provides a basic technology for the research and development of thermal energy efficiency data collection terminals, it still has not fully adapted to cluster deployment, collection of multiple data types, and transmission of multiple interfaces. Requirements for energy efficiency thermal quantity collection on industrial sites.

The utility model provides a technical solution, which collects a variety of thermal parameters through cluster deployment, and realizes safe, stable and reliable transmission of various interfaces, making real-time collection and transmission of energy-efficiency thermal parameters possible , providing technical support for real-time collection of energy efficiency data.

Utility model content

The utility model provides a thermal-type energy efficiency data collection terminal, which realizes group deployment, collection of various data types, transmission of various interfaces, etc., and is completely suitable for collection of energy efficiency thermal quantities on industrial sites.

In order to achieve the above object, the utility model adopts the following technical solutions:

A thermal type energy efficiency data acquisition terminal, the terminal includes a micro-processing module MCU, a data storage module, a power supply module and an RS485 interface module; the micro-processing module MCU is connected to a signal sampling module, including a chip clock module and an AD conversion module The data storage module is bidirectionally connected to the microprocessing module; the power supply module supplies power to the microprocessing module MCU; the RS485 interface module, the micropower wireless module and the PLC carrier communication module are bidirectionally connected to the microprocessing module MCU. The data storage module includes a flash memory U4 whose model is MX25L3206E and a ferroelectric memory U5 whose model is PM25CL64.

The signal sampling module is one or more sensors among flow sensor, humidity sensor, pressure sensor and temperature sensor.

The RS485 interface is a standard configuration interface of the terminal, and the interfaces of the micro-power wireless module and the PLC carrier communication module are pluggable, and both share the same interface standard on the terminal.

The AD conversion module adopts a 12-bit precision AD converter.

The terminal adopts an intensive method combining soft clock and network time synchronization.

The terminal inputs the 4-20mA current analog signals collected and converted by the 4 or 8-channel signal sampling modules into its input port, or directly receives the digital signals by using the RS485 interface module.

The terminal sets the copying type and curve parameters for each port through the host computer or the handheld computer, and sets the default value of the interval of the recording copying time of the curve parameters.

The acquisition accuracy of the terminal is Class B accuracy of instrument performance classification, or not lower than the Class 2.0 accuracy stipulated in the national standard.

The power supply module adopts PT (Potential Transformer) power supply mode to make the equipment structure and terminal arrangement compact; the test objects of the power supply module are three-phase three-wire and three-wire four-wire circuits or high voltage.

The micro-processing module MCU includes a main control chip U1, which has an ARM Cortex_M3 core, and the highest operating frequency can reach 100MHZ.

The RS485 interface module includes two RS485 interface chips, and a photoelectric coupler is used for photoelectric isolation between the interface chips and the main control chip U1 to prevent signals from interfering with the main control chip U1.

The PLC carrier communication module is bidirectionally connected to the main control chip U1 and connected to the power lines L and N; it includes a chip U10.

Compared with the prior art, the utility model has the beneficial effects of:

1. Strong anti-interference and high reliability;

2. Solve the problem of thermal energy efficiency data collection and transmission, realize cluster deployment, multiple data type collection, multiple interface transmission, etc., fully adapt to the collection of industrial site energy efficiency thermal data, and provide an accurate energy efficiency basis for energy efficiency data centers Data to provide support for energy conservation policies of the country and government agencies at all levels;

3. The technical solution provided by the utility model fully considers the requirements of different working environments, such as adopting signal transmission communication modes such as micro-power wireless and PLC, and leaving an expansion interface for the realization of intelligent control of the future master station.

Description of drawings

Figure 1 is a structural diagram of a thermal energy efficiency data acquisition terminal;

Fig. 2 is the circuit principle diagram of microprocessing module MCU;

Fig. 3 is the circuit principle diagram of data storage module;

Fig. 4 is the circuit principle diagram of RS485 interface;

Fig. 5 is a schematic circuit diagram of the PLC carrier communication module.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, a kind of thermal type energy efficiency data collection terminal, described terminal comprises microprocessing module MCU, data storage module, power supply module and RS485 interface module; Described microprocessing module MCU is connected with signal sampling module, comprises chip Clock module and AD conversion module; The data storage module is bidirectionally connected with the microprocessing module; The power supply module supplies power for the microprocessing module MCU; The RS485 interface module, the micropower wireless module and the PLC carrier communication module are respectively connected to the microprocessing module MCU bidirectional connection.

The signal sampling module is one or more sensors among flow sensor, humidity sensor, pressure sensor and temperature sensor.

The RS485 interface is a standard configuration interface of the terminal, and the interfaces of the micro-power wireless module and the PLC carrier communication module are pluggable, and both share the same interface standard on the terminal.

The AD conversion module adopts a 12-bit precision AD converter.

The terminal adopts an intensive method combining soft clock and network time synchronization.

The terminal inputs the 4-20mA current analog signals collected and converted by the 4 or 8-channel signal sampling modules into its input port, or directly receives the digital signals by using the RS485 interface module.

The terminal sets the copying type and curve parameters for each port through the host computer or the handheld computer, and the interval of the recording copying time of the curve parameters is set to 15 minutes by default.

The acquisition accuracy of the terminal is Class B accuracy of instrument performance classification, or not lower than the Class 2.0 accuracy stipulated in the national standard.

The power supply module adopts PT (Potential Transformer) power supply mode to make the device structure and terminal arrangement compact; the allowable error change limit caused by the power supply voltage of PT power supply mode changes within the specified working range meets the relevant requirements of GB/17215.301-2007 Requirements; the allowable error range refers to the allowable error change value of the electrical measurement unit when the voltage changes within the range of 0.8Un～0.9Un and 1.1Un～1.15Un, which does not exceed 3 times the limit of the allowable error change value within the specified working range. When the voltage is lower than 80% of the rated voltage, the error of the terminal changes in the range of -100% to +10%.

The test objects of the power module are three-phase three-wire and three-wire four-wire circuits or high voltage.

As shown in FIG. 2, the micro-processing module MCU includes a main control chip U1 whose model is LPC1765.LPC1765, which has an ARM Cortex_M3 core, and the operating frequency can reach up to 100MHZ. The ARM Cortex-M3 CPU has a 3-stage pipeline and a Harvard architecture with separate local instruction and data buses and a slightly lower performance third bus for peripherals.

The peripheral components of the LPC1765Cortex-M3 microcontroller include: 256KB Flash memory, 64KB data memory, Ethernet MAC, USB host/slave/OTG interface, 8-channel general-purpose DMA controller, 4 UARTs, 2 CANs channels, 2 SSP controllers, SPI interface, 3 I2C interfaces, 2-input and 2-output I2S interfaces, 8-channel 12-bit ADC, 10-bit DAC, motor control PWM, quadrature encoder interface, 4 General-purpose timer, 6-output general-purpose PWM, ultra-low-power RTC with independent battery supply and up to 70 general-purpose I/O pins.

LPC1765 has in-system programming (ISP) and in-application programming (IAP) 256KB on-chip Flash program memory. By integrating the enhanced Flash storage accelerator and the location of the Flash memory on the CPU local code/data bus, Flash can provide high-performance code;

LPC1765 single 3.3V power supply (2.4V-3.6V). The temperature range is -40°C-85°C;

In the present invention, totally 4 serial ports of UART0, UART0, UART1, UART2 and UART3 are used, wherein UART0 is used for infrared communication; UART1 is used for carrier/small wireless communication; UART2 is used for the second RS485 communication; UART3 is used for The first RS485 communication.

The FLASH memory U4 and the ferroelectric memory U5 are connected to the SSP1 interface P0.7, P0.8 and P0.9 of the microcontroller through the SPI bus, and P0.5 and P0.6 are the chip selects of the FLASH memory U4 and the ferroelectric memory U5 respectively Wire.

P1.19 is connected to the status indicator pin of the AT7022 metering chip, and P1.20, P1.23 and P1.24 are the clock line and signal line for the communication between the microcontroller and AT7022 through the SPI bus.

P1.21 is the chip selection line of AT7022, P1.22 is the reset line of AT7022, P2.11 and P2.22 are the active pulse and reactive pulse output lines of AT7022 respectively.

P2.3 outputs 38K modulation wave, which is used for modulation of infrared communication. The output of this pin uses the internal PWM output function of the microcontroller.

As shown in FIG. 3 , the data storage module is connected to the main control chip U1 through the SPI communication interface, which includes a flash memory U4 of model MX25L3206E and a ferroelectric memory U5 of model PM25CL64.

As shown in Figure 4, the RS485 interface module includes 2 RS485 interface chips with the model number SN65HV03082EOR. Since FTC1/2/3/4 is added as a protection device, it prevents damage to the equipment caused by high voltage and high current. Solve the problems of RS485 interface damage, lightning strikes, etc. The RS485 interface can withstand 220V AC for 5 minutes without damage. A photoelectric coupler is used for photoelectric isolation between the chip of model SN65HV03082EOR and the main control chip U1, so as to prevent the signal from interfering with the main control chip U1.

As shown in FIG. 5 , the PLC carrier communication module is bidirectionally connected to the main control chip U1 and connected to the power lines L and N; it includes a chip U10 whose model is 74HCT244.

The terminal has strong anti-interference characteristics, has perfect and thorough electromagnetic compatibility (mechanical structure, power supply, PCB wiring, decoupling, filtering, grounding, photoelectric isolation, etc.), and can adapt to harsh operations such as high and low temperature and high humidity environment, with complete and thorough three-level lightning protection measures (lightning protection measures for power lines and communication interfaces). Electromagnetic Compatibility Electromagnetic compatibility of industrial process measurement and control devices in compliance with IEC61000-4 (electrostatic discharge immunity test, radiated electromagnetic field immunity test, electrical fast transient burst immunity test, external magnetic field influence, High frequency immunity test).

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: It is still possible to modify or equivalently replace the specific embodiments of the present utility model, and any modification or equivalently replace without departing from the spirit and scope of the present utility model shall be covered by the pending claims of this application.

Claims (13)

1. A thermal type energy efficiency data acquisition terminal, said terminal comprising microprocessing module MCU, data storage module, power supply module and RS485 interface module; It is characterized in that: The micro-processing module MCU includes a chip clock module and an AD conversion module, which is connected with the signal sampling module; The data storage module is bidirectionally connected to the microprocessing module; The power supply module supplies power to the micro-processing module MCU; The RS485 interface module, the micro-power wireless module and the PLC carrier communication module are bidirectionally connected with the micro-processing module MCU respectively; The data storage module includes a flash memory U4 whose model is MX25L3206E and a ferroelectric memory U5 whose model is PM25CL64. 2. A thermal type energy efficiency data collection terminal according to claim 1, wherein the signal sampling module is one or more of flow sensors, humidity sensors, pressure sensors and temperature sensors. 3. A kind of thermal type energy efficiency data collection terminal as claimed in claim 1, is characterized in that: described RS485 interface is the standard configuration interface of described terminal, and described micropower wireless module and PLC carrier communication module interface are available Pluggable, the two share the same interface standard on the terminal. 4. A thermal energy efficiency data collection terminal as claimed in claim 1, characterized in that: said AD conversion module adopts a 12-bit precision AD converter. 5. A thermal energy efficiency data collection terminal according to claim 1, characterized in that: said terminal adopts an intensive method combining soft clock and network time synchronization. 6. A thermal type energy efficiency data acquisition terminal as claimed in claim 5, characterized in that: said terminal inputs 4-20mA current analog signals collected and converted by said signal sampling modules of 4 or 8 channels into its input Port, or use the RS485 interface module to receive digital signals directly. 7. A kind of thermal type energy efficiency data collection terminal as claimed in claim 6, is characterized in that: described terminal is set copy type and curve parameter to each described port through host computer or handheld computer, and sets described curve parameter The default value for the interval between record copying times. 8. A thermal type energy efficiency data collection terminal as claimed in claim 7, characterized in that: the collection accuracy of the terminal is B-level accuracy of instrument performance classification, or not lower than the 2.0-level accuracy specified in the national standard. 9. A thermal type energy efficiency data collection terminal as claimed in claim 1, characterized in that: said power supply module adopts PT (Potential Transformer) power supply mode, so as to make the device structure and terminal arrangement compact. 10. A thermal type energy efficiency data collection terminal according to claim 9, wherein the test object of the power module is a three-phase three-wire or three-wire four-wire circuit or a high voltage. 11. A thermal type energy efficiency data acquisition terminal as claimed in claim 1, characterized in that: the micro-processing module MCU includes a main control chip U1, which has an ARM Cortex_M3 core, and the operating frequency can reach up to 100MHz. 12. A thermal type energy efficiency data acquisition terminal as claimed in claim 1, characterized in that: said RS485 interface module includes two RS485 interface chips, between said interface chip and the main control chip U1 is connected by a photoelectric The coupler performs photoelectric isolation to prevent signals from interfering with the main control chip U1. 13. A thermal energy efficiency data acquisition terminal according to claim 1, characterized in that: the PLC carrier communication module is bidirectionally connected to the main control chip U1, and connected to the power lines L and N; it includes a chip U10.

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