CN217846454U - Remote electric quantity data acquisition system - Google Patents
Remote electric quantity data acquisition system Download PDFInfo
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- CN217846454U CN217846454U CN202222033120.4U CN202222033120U CN217846454U CN 217846454 U CN217846454 U CN 217846454U CN 202222033120 U CN202222033120 U CN 202222033120U CN 217846454 U CN217846454 U CN 217846454U
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Abstract
The utility model discloses a remote electric quantity data acquisition system, which comprises a singlechip, an electric energy metering circuit, a signal conditioning circuit, an LCD display circuit, a keyboard, a storage circuit, a clock circuit, an RS-485 communication circuit and an NB-IOT communication module; the single chip microcomputer is respectively and electrically connected with the electric energy metering circuit, the signal conditioning circuit, the LCD display circuit, the keyboard, the storage circuit, the clock circuit, the RS-485 communication circuit and the NB-IOT communication module. The utility model has simple design and easy realization; the narrow-band Internet of things (NB-IOT) module is adopted to realize remote wireless transmission of data, and the method has the advantages of capacity of accommodating massive nodes, low power consumption, low cost, wide coverage range and convenience in use.
Description
Technical Field
The utility model relates to an electric energy data acquisition technology, concretely relates to long-range electric quantity data acquisition system.
Background
At present, in the prior art, an analog-to-digital converter is used for converting acquired electric quantity analog signals into digital quantity signals which can be identified by a single chip microcomputer, and the single chip microcomputer obtains electric quantity values such as voltage, current, active power, reactive power and the like through operation, so that the single chip microcomputer is overloaded in calculation load, complex in circuit design and large in error.
In the prior art, GPRS communication is used for realizing remote wireless transmission of data, but the large-area application of GPRS communication is limited due to the factors of small capacity, high cost, high power consumption, data safety and the like of a user of the GPRS communication.
Disclosure of Invention
The utility model provides a to above-mentioned problem, provide a long-range electric quantity data acquisition system, utilize high accuracy electric energy measurement chip and narrowband thing networking (NB-IOT) module to solve that prior art system design is complicated, electric quantity data is single, the big precision of error is not high, and data long-range wireless transmission expense is high, the consumption is high, data security and use limited problem.
The utility model discloses a technical scheme do: a remote electric quantity data acquisition system comprises a single chip microcomputer, an electric energy metering circuit, a signal conditioning circuit, an LCD display circuit, a keyboard, a storage circuit, a clock circuit, an RS-485 communication circuit and an NB-IOT communication module; the single chip microcomputer is respectively and electrically connected with the electric energy metering circuit, the signal conditioning circuit, the LCD display circuit, the keyboard, the storage circuit, the clock circuit, the RS-485 communication circuit and the NB-IOT communication module;
wherein:
the single chip microcomputer is used for receiving data, processing information and outputting instructions;
the electric energy metering circuit is used for collecting electric quantity data and transmitting the electric quantity data to the single chip microcomputer;
the signal conditioning circuit is used for adjusting the voltage and current signals to be within the range required by the sampling channel of the electric energy metering circuit, and the output of the signal conditioning circuit is connected with the electric energy metering circuit;
the LCD display circuit is used for receiving and displaying electric quantity data information sent by the single chip microcomputer;
the keyboard is used for outputting instructions to be transmitted to the singlechip to carry out parameter setting and data query;
the storage circuit is used for receiving a storage instruction sent by the singlechip to store and call data;
the clock circuit is in communication connection with the single chip microcomputer and is used for providing real-time information for the system;
the RS-485 communication circuit is used for receiving the instruction of the singlechip and carrying out wired data transmission with an upper computer;
and the NB-IOT module is used for receiving the instruction of the single chip microcomputer and carrying out remote wireless data transmission with an upper computer.
Furthermore, the signal conditioning circuit comprises a current type voltage transformer, a current transformer, an RC filter circuit and a protection circuit; the output of the current type voltage transformer is connected with an RC filter circuit, and the output of the RC filter circuit is connected with a protection circuit for voltage signal conditioning; the output of the current transformer is connected with an RC filter circuit, and the output of the RC filter circuit is connected with a protection circuit and used for conditioning current signals;
the current type voltage transformer is used for converting the line voltage into a low-voltage signal and outputting the low-voltage signal to the RC filter circuit;
the current transformer is used for converting line current into a low-voltage signal and outputting the low-voltage signal to the RC filter circuit;
the RC filter circuit is used for filtering interference signals and outputting the interference signals to the protection circuit;
the protection circuit is used for limiting the collected signals within the range required by the electric energy metering chip.
Furthermore, the rated input/output current of the current type voltage transformer is 2mA/2mA, and a resistor is connected to the secondary side of the transformer to convert a current signal into a required voltage signal.
Furthermore, the electric energy metering chip is provided with three voltage sampling channels and three current sampling channels, is connected with the single chip microcomputer through the SPI communication interface and is used for transmitting instructions and data.
Furthermore, the remote electric quantity data acquisition system further comprises a power supply module which is used for providing the required working voltage for the system.
The utility model has the advantages that:
the utility model discloses a long-range electric quantity data acquisition system adopts high accuracy electric energy measurement chip, and the electric quantity data precision that obtains is high, the error is little, the data type is abundant, and the singlechip calculates the burden lightly, and system design is simple, realizes easily; the narrow-band Internet of things (NB-IOT) module is adopted to realize remote wireless transmission of data, and the method has the advantages of capacity of accommodating massive nodes, low power consumption, low cost, wide coverage and convenience in use.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.
Fig. 1 is a schematic diagram of the overall system structure of the present invention;
FIG. 2 is a circuit diagram of the electric energy metering device of the present invention;
fig. 3 is a circuit diagram of the signal conditioning circuit of the present invention;
fig. 4 is a memory circuit diagram of the present invention;
figure 5 is the utility model discloses a RS-485 communication circuit diagram
Fig. 6 is a diagram of NB-IOT communication hardware structure of the present invention;
fig. 7 is a clock circuit diagram of the present invention;
fig. 8 is a flowchart of the program control of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, the utility model provides a remote electric quantity data acquisition system, which comprises a single chip microcomputer, an electric energy metering circuit, a signal conditioning circuit, an LCD display circuit, a keyboard, a storage circuit, a clock circuit, an RS-485 communication circuit, and an NB-IOT communication module; the single chip microcomputer is respectively and electrically connected with the electric energy metering circuit, the signal conditioning circuit, the LCD display circuit, the keyboard, the storage circuit, the clock circuit, the RS-485 communication circuit and the NB-IOT communication module.
Wherein:
the single chip microcomputer is used for receiving data, processing information and outputting instructions;
the electric energy metering circuit is used for collecting electric quantity data and transmitting the electric quantity data to the single chip microcomputer;
the signal conditioning circuit is used for adjusting the voltage and current signals to be within the range required by the sampling channel of the electric energy metering circuit, and the output of the signal conditioning circuit is connected with the electric energy metering circuit;
the LCD display circuit is used for receiving and displaying electric quantity data information sent by the single chip microcomputer;
the keyboard is used for outputting instructions to be transmitted to the singlechip for parameter setting and data query;
the storage circuit is used for receiving a storage instruction sent by the singlechip to store and call data;
the clock circuit is in communication connection with the single chip microcomputer and is used for providing real-time information for the system;
the RS-485 communication circuit is used for receiving the instruction of the singlechip and carrying out wired data transmission with an upper computer;
and the NB-IOT module is used for receiving the instruction of the single chip microcomputer and carrying out remote wireless data transmission with an upper computer.
The signal conditioning circuit comprises a current type voltage transformer, a current transformer, an RC filter circuit and a protection circuit; the output of the current type voltage transformer is connected with an RC filter circuit, and the output of the RC filter circuit is connected with a protection circuit for conditioning voltage signals; the output of the current transformer is connected with an RC filter circuit, and the output of the RC filter circuit is connected with a protection circuit and used for conditioning current signals; the current type voltage transformer is used for converting line voltage into a low-voltage signal and outputting the low-voltage signal to the RC filter circuit, the current transformer is used for converting line current into a low-voltage signal and outputting the low-voltage signal to the RC filter circuit, the RC filter circuit is used for filtering interference signals and outputting the interference signals to the protection circuit, and the protection circuit is used for limiting acquired signals within a range required by the electric energy metering chip.
The rated input/output current of the current type voltage transformer is 2mA/2mA, and a resistor is connected to the secondary side of the transformer to convert a current signal into a required voltage signal.
The electric energy metering chip is provided with three voltage sampling channels and three current sampling channels, is connected with the single chip microcomputer through the SPI communication interface and is used for transmitting instructions and data.
The utility model discloses a long-range electric quantity data acquisition system still includes power module for provide required operating voltage for the system.
In this embodiment, the software programming of the system is mainly divided into a keyboard processing and displaying subroutine, an electric quantity data collecting subroutine, a communication subroutine, and the like, according to the functions realized by the system software.
The single chip microcomputer adopts dsPIC30F6012, and abundant peripheral interfaces such as double UARTs, double CAN communication modules, double SPI interfaces and the like are integrated in the single chip microcomputer, so that the design of a circuit is greatly simplified, the reliability of a system is improved, and the cost of the system is reduced. It has 41 interrupt sources, and its priority is divided into natural order and user distribution priority, which can be set by program.
The electric energy metering circuit adopts a high-precision electric energy metering chip ADE9078, and 7 independent synchronous sampling devices are integrated in the deviceEach second-order sigma-delta ADC has 24 bits, sampled voltage and current signals are input in a differential mode, the input range is +/-1V, the dynamic range is 10000. A low-noise and low-drift band-gap reference voltage source is arranged in the single chip microcomputer dsPIC30F6012, conversion accuracy is guaranteed, an SPI serial communication interface is arranged, and the single chip microcomputer dsPIC30F6012 is directly in butt joint with an on-chip SPI interface. The peripheral circuits are shown in fig. 2. Pins 29 and 30 of the ADE9078 are connected with a 12.288MHz crystal oscillator circuit to provide clock signals required by stable work for an on-chip ADC and a DSP core; 0.1uF and 4.7uF connected to pins 3, 16, 25 and 27 of the ADE9078 are decoupling capacitors which are used for removing high-frequency noise; IAP and IAN, IBP and IBN, ICP and ICN are current conversion channels of ADE9078, and are connected with the output of the current sampling circuit in the signal conditioning circuit shown in fig. 3 (a); VAP and VAN, VBP and VBN, VCP and VCN are voltage conversion channels of ADE9078, and are connected with the output of the voltage sampling circuit in the signal conditioning circuit shown in fig. 3 (b); the input signal on the pin must not exceed 0.6V; the SPI interface pins of ADE9078 are 37, 38, 39 and 40, i.e.
MOSI, MISO, SCLK link to each other with the corresponding pin 8 of the SPI interface of singlechip, 6, 5, 4, and singlechip accessible SPI interface sets up the register of electric energy meter chip and reads electric quantity data.
The signal conditioning circuit comprises a current type voltage transformer, a current transformer, an RC filter circuit and a protection circuit. ZMPT101B is adopted as the current type voltage transformer, the rated input/output current is 2mA/2mA, the linear range is 0-1000V, the linearity is less than or equal to 0.2%, the isolation voltage resistance is 4500V, and a resistor R8 on the secondary side of the voltage transformer converts a 2mA current signal into a voltage signal of about 0.5V as shown in figure 3 (a); the protection circuit is composed of anti-parallel diodes D5 and D6 as shown in fig. 3 (a), and prevents the pins of the ADE9078 from being damaged by higher voltage; the RC filter circuit is a low-pass filter composed of a resistor R6 and a capacitor C14 as shown in fig. 3 (a), and filters interference in signals, and the filtered signals are sent to a 19 th pin voltage conversion channel of the electric energy metering chip ADE 9078. The current transformer adopts ZMCT118A, the rated input/output current is 5A/2.5mA, the transformation ratio is 2000:1, adopting fully differential input, as shown in fig. 3 (b), converting a current signal into a voltage signal by resistors R3 and R4 on the secondary side of a current transformer, preventing the pin of the ADE9078 from being damaged by a higher voltage through a protection circuit formed by diodes D1, D2, D3 and D4, and finally sending the voltage signal into the 7 th pin and8 th pin current conversion channels of the electric energy metering chip ADE9078 after the interference in the signal is filtered by an RC filter circuit formed by R2, C13, R5 and C12.
The LCD display circuit adopts an LCD with the model of lcm-DT12864, the resolution ratio is 128 multiplied by 64, a national standard word library set is arranged in the LCD display circuit, and the LCD display circuit has a plurality of interface modes of 4 bit/8 bit parallel, 2 lines or 3 lines serial. The utility model discloses an use the IO bush of singlechip to imitate serial chronogenesis, realize showing the various information of electric energy meter to LCD's operation.
The keyboard adopts independent keys, four keys are respectively determined, cancelled, increased and decreased, the level conversion interrupt characteristic of four pins RB 7-RB 4 of a PORTB port of a singlechip dsPIC30F6012 is used, and four independent keys are designed by utilizing a pull-up resistor to realize parameter setting and data query.
The storage circuit adopts AT24C02, and the AT24C02 is based on I produced by Ateml company 2 The C bus 256B is a serial electrically erasable programmable memory that has 32 pages of 8 bytes each, and has an address of 8 bits for any location, and an address range of 00-FFH. It adopts 8-pin package, and its working voltage is 2.5-5.5 v. As shown in fig. 4, the pins A0, A1, A2 of the AT24C02 are chip select input terminals, and since only one AT24C02 is provided, all of them are grounded; the AT24C02 and the singlechip are connected through I 2 The C bus is connected, and the 5 th pin SDA and the 6 th pin SCL of the AT24C02 are connected with the 36 th pin SDA and the 37 th pin SCL of the single chip microcomputer.
The clock circuit provides real-time such as year, month, day, time, minute, second and the like for the system by a clock chip PCF8563, a circuit diagram of the clock circuit is shown in figure 5, the chip can work under the wide voltage range of 1.0-5.5V, adopts dual power supply to supply power, is supplied with power by +3.3V under normal conditions, is supplied with power by a 3.6V battery pack after power failure, and pins 5 and 6 SDA, SCL and SCL thereof are connected with a battery packThe 46 th and 49 th pins RD0 and RD1 of the single chip microcomputer are connected, and I is simulated in a program mode 2 And C, a bus time sequence, setting and reading real-time of a register in a clock chip by the singlechip, and providing a second clock signal for the chip by the crystal oscillator of 32768 Hz.
The RS-485 communication circuit is designed by adopting SP485R chips produced by sipex corporation, the SP485R is a low-power-consumption RS485 differential transceiver and comprises a half-duplex transmitter and a receiver which can be controlled in a three-state mode, compared with a general 485 chip, the RS-485 communication circuit comprises higher ESD protection and high receiver input impedance, and 400 SP485R chips can be connected to one transmission line in a hanging mode without signal attenuation. As shown in fig. 6, a pin 1 of the SP485R is connected to a pin 31U 2RX of the single chip microcomputer as a data receiving terminal; pins 2 and3 of the SP485R are receiving and sending enabling ends which are connected with a pin 50 RD2 of the single chip microcomputer through an inverter; a 4 th pin of the SP485R is a data sending end and is connected with a 32 th pin U2TX of the singlechip; the 5 th pin of the SP485R is a grounding end; the 6 th pin and the 7 th pin of the SP485R are connected with a data bus; and the 8 th pin of the SP485R is used for connecting a power supply end with +5v power supply.
The NB-IOT module adopts an NB-IOT module M5311 produced by a mobile company to realize narrow-Band Internet of things communication, adopts LCC (chip control Circuit) packaging, has the characteristics of small size, low power consumption and high performance, supplies power for 4.5V-16V under wide voltage, outputs 3.3V/2A under the condition of on-chip self-contained DC-DC conversion, can supply power for external systems such as a single chip microcomputer and the like, simplifies the power supply design of the system, has the working temperature of-40-85 ℃, supports frequency bands of Band3, band5 and Band8, and is particularly suitable for the loT industries such as intelligent home, shared economy, wearable equipment, remote meter reading systems, municipal management and the like. An application hardware structure diagram of the M5311 is shown in fig. 7, a circuit design mainly comprises parts such as serial port communication, resetting, a crystal oscillator, an antenna interface circuit, a SIM card circuit, LED indication and the like, and data are transmitted between TXD and RXD pins of the M5311 and 34 th and 33 th pins U1RX and U1TX of a single chip microcomputer through URAT serial port communication.
The utility model discloses what mainly protect is the circuit hardware of long-range electric quantity data acquisition system to technical personnel in the field carry out further development on this basis.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A remote electric quantity data acquisition system is characterized by comprising a single chip microcomputer, an electric energy metering circuit, a signal conditioning circuit, an LCD display circuit, a keyboard, a storage circuit, a clock circuit, an RS-485 communication circuit and an NB-IOT communication module; the single chip microcomputer is respectively and electrically connected with the electric energy metering circuit, the signal conditioning circuit, the LCD display circuit, the keyboard, the storage circuit, the clock circuit, the RS-485 communication circuit and the NB-IOT communication module;
wherein:
the single chip microcomputer is used for receiving data, processing information and outputting instructions;
the electric energy metering circuit is used for collecting electric quantity data and transmitting the electric quantity data to the single chip microcomputer;
the signal conditioning circuit is used for adjusting the voltage and current signals to be within the range required by the sampling channel of the electric energy metering circuit, and the output of the signal conditioning circuit is connected with the electric energy metering circuit;
the LCD display circuit is used for receiving and displaying electric quantity data information sent by the single chip microcomputer;
the keyboard is used for outputting instructions to be transmitted to the singlechip for parameter setting and data query;
the storage circuit is used for receiving a storage instruction sent by the singlechip to store and call data;
the clock circuit is in communication connection with the single chip microcomputer and is used for providing real-time information for the system;
the RS-485 communication circuit is used for receiving the instruction of the singlechip and carrying out wired data transmission with an upper computer;
and the NB-IOT module is used for receiving the instruction of the single chip microcomputer and carrying out remote wireless data transmission with an upper computer.
2. The remote electrical quantity data acquisition system according to claim 1, wherein the signal conditioning circuit comprises a current-mode voltage transformer, a current transformer, an RC filter circuit, a protection circuit; the output of the current type voltage transformer is connected with an RC filter circuit, and the output of the RC filter circuit is connected with a protection circuit for conditioning voltage signals; the output of the current transformer is connected with an RC filter circuit, and the output of the RC filter circuit is connected with a protection circuit and used for conditioning current signals;
the current type voltage transformer is used for converting the line voltage into a low-voltage signal and outputting the low-voltage signal to the RC filter circuit;
the current transformer is used for converting the line current into a low-voltage signal and outputting the low-voltage signal to the RC filter circuit;
the RC filter circuit is used for filtering interference signals and outputting the interference signals to the protection circuit;
the protection circuit is used for limiting the acquired signals within the range required by the electric energy metering chip.
3. The remote electric quantity data acquisition system according to claim 1, wherein the rated input/output current of the current type voltage transformer is 2mA/2mA, and a resistor is connected to the secondary side of the transformer to convert a current signal into a required voltage signal.
4. The remote electric quantity data acquisition system according to claim 1, wherein the electric energy metering chip has three voltage sampling channels and three current sampling channels, and is connected with the single chip microcomputer through an SPI communication interface for transmission of instructions and data.
5. The remote electrical quantity data acquisition system according to claim 1, further comprising a power module for providing a required operating voltage to the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222033120.4U CN217846454U (en) | 2022-08-03 | 2022-08-03 | Remote electric quantity data acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222033120.4U CN217846454U (en) | 2022-08-03 | 2022-08-03 | Remote electric quantity data acquisition system |
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| Publication Number | Publication Date |
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| CN217846454U true CN217846454U (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222033120.4U Active CN217846454U (en) | 2022-08-03 | 2022-08-03 | Remote electric quantity data acquisition system |
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| CN (1) | CN217846454U (en) |
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