CN104316895A - Single-phase and three-phase power meter detector - Google Patents

Abstract

The invention discloses a single-phase and three-phase power meter detector, and relates to an instrument of an electric power information monitoring device. The single-phase and three-phase power meter detector can online test single-phase and three-phase power, give interpretable basis to residents and users, judge a single-phase and three-phase power meter visually, solve the conflict between a power supply department and the residents, and make the residents accept the power meter. The single-phase and three-phase power meter detector comprises a power acquisition circuit, an MCU control circuit, a communication circuit and a power supply management circuit. Under the stable voltage supplied by the power supply management circuit, the MCU control circuit of the single-phase and three-phase power meter detector acquires, processes and stores voltage signals and current signals on line through the power acquisition circuit and transmits detected data to a thermal printer and a GPRS module through a serial port.

Description

A kind of single three-phase electric energy meter detecting instrument

Technical field

The present invention relates to a kind of energy information monitoring device, particularly a kind of instrument of energy information monitoring device.

Background technology

Single three-phase electric energy meter detecting instrument is an a kind of instrument of energy on-line testing list three-phase electric energy, and the front end of electric energy meter is received in wiring, has anti-electricity-theft effect, has good development prospect.Because single three-phase electric energy meter metering is accurate, compare mechanical power energy meter accurate measurement, the fast of metering is always thought when resident uses, have objection to during single three-phase electric energy meter, according to advanced on-line testing technique, on-line testing can be implemented to single three-phase electric energy, interpretable foundation is provided to resident, judge can be provided to single three-phase electric energy meter intuitively, the contradiction of power supply department and resident can be solved, make resident approve electric energy meter.A kind of single three-phase electric energy meter detecting instrument just can complete this function, and power supply department is badly in need of such instrument.

Summary of the invention

The present invention is to overcome the deficiencies in the prior art part, adapts to current in electric energy meter use procedure, single three-phase electric energy is implemented to the demand of on-line testing, provides a kind of single three-phase electric energy meter detecting instrument.

The present invention is achieved by following scheme:

A kind of single three-phase electric energy meter detecting instrument, it comprises electric quantity acquisition circuit, MCU control circuit, telecommunication circuit and electric power management circuit, under the burning voltage that the described anti-electricity-theft detector of single three-phase electric energy meter supplies at electric power management circuit, its MCU control circuit passes through the collection of electric quantity acquisition circuit realiration on-Line Voltage signal and current signal and process stores and display, and sends the data detected to thermal printer and GPRS module by serial ports.

Described electric quantity acquisition circuit comprises current sampling circuit, voltage sample circuit and three-phase electrical energy computation chip, completes the collection of single three-phase electric energy meter detecting instrument electricity.

Wherein said MCU control circuit is made up of PIC18F66K80 master chip and peripheral circuit, completes the various functions of single three-phase electric energy meter detecting instrument.

Wherein said telecommunication circuit is that one utilizes serial ports to carry out serial communication, and serial communication can complete on-the-spot output report by thermal printer; Serial communication also can realize telecommunication by GPRS module.Utilize Serial Port Line to be connected with MAX232 chip, MAX232 exports and connects thermal printer, completes local communication; Utilize Serial Port Line to be connected with GPRS module, GPRS module completes telecommunication.

Electric power management circuit comprises transformer and peripheral circuit, bleeder circuit and voltage conversion circuit, and transformer and peripheral circuit export two-way 12V voltage, and a road exports 4V voltage after bleeder circuit, for GPRS module work; One tunnel exports 5V voltage after voltage conversion circuit, for MCU control circuit and thermal printer work.

Compared with prior art, the invention has the beneficial effects as follows can the electric energy of on-line testing electric energy meter, and need not to have a power failure wiring to electric energy meter, direct-on-line is tested, and a comparison can be done with residential electric energy meter, test data is printed by serial communication or is gone out by GPRS remote transmission.

Accompanying drawing explanation

Fig. 1 is single three-phase electric energy meter detecting instrument theory diagram of the present invention; Fig. 2 is electric quantity acquisition schematic block circuit diagram; Fig. 3-Fig. 5 is electric quantity acquisition circuit theory diagrams, and wherein Fig. 3 three-phase voltage sampling theorem figure, Fig. 4 are three-phase current sampling theorem figure; Fig. 5 is three phase metering chip concept figure; Fig. 6 is single three-phase electric energy meter detecting instrument MCU control circuit theory diagram; Fig. 7 is single three-phase electric energy meter detecting instrument MCU control circuit schematic diagram; Fig. 8 is serial communication theory diagram; Fig. 9-Figure 10 is telecommunication circuit schematic diagram, and wherein Fig. 9 is MAX232 chip and embedded panel thermal printer AB_W5820 telecommunication circuit schematic diagram, and Figure 10 is GPRS module telecommunication circuit schematic diagram; Figure 11 is electric power management circuit theory diagram; Figure 12-Figure 14 is electric power management circuit schematic diagram, and wherein Figure 12 is transformer and peripheral circuit schematic diagram in electric power management circuit, and Figure 13 is bleeder circuit schematic diagram in electric power management circuit, and Figure 14 is voltage conversion circuit schematic diagram in electric power management circuit.

Embodiment

As shown in Figure 1, a kind of single three-phase electric energy meter detecting instrument described in this embodiment, it comprises electric quantity acquisition circuit, MCU control circuit, telecommunication circuit and electric power management circuit, described electric quantity acquisition circuit comprises current sampling circuit, voltage sample circuit and three-phase electrical energy computation chip, complete the collection of single three-phase electric energy meter detecting instrument electricity, electric quantity acquisition circuit accesses voltage signal by connection terminal, carry out voltage sampling, electric current is accessed by forcipated mutual-inductor, carry out current sampling, the sampling voltage of voltage and current connects the process of three phase metering chip, its theory diagram is as Fig. 2, every phase voltage sampling accesses two resistance 250K/0.5W after accessing voltage by terminal, connect voltage transformer pt again, voltage transformer pt is 2MA/2MA, convert voltage signal to small-signal, voltage transformer (VT) is secondary connects 70 ohm of sample resistances, connect 1.2K and 10K electric resistance partial pressure again, REFOUT connects computation chip, VXP finally connects three phase metering chip input end, A, B, C tri-phase connection is identical, basic circuit diagram is as Fig. 3, every phase current accesses current signal online through forcipated mutual-inductor, 1.2K divider resistance is connect after connecing 40 ohm of sample resistances, finally connect three phase metering chip input end, A, B, C tri-phase connection is identical, basic circuit diagram is as Fig. 4, voltage and current signal meets three phase metering chip ATT7022B, ATT7022B electrify restoration circuit selects resistance 100K, the rc reset circuit of electric capacity 0.1U, can when powering on reliable reset, make ATT7022B working properly, crystal oscillating circuit selects two 15PF electric capacity and 24.576MHZ crystal oscillator, composition crystal oscillating circuit, high-precision frequency is provided to ATT7022B, ATT7022B operating voltage is 5V, with the filter capacitor of indirect 0.1U and 0.01U on ground, ATT7022B works in SPI mode, DOUT, DIN, SCLK, CS, meet the RF0-RF3 of the RF mouth of MCU chip respectively, can to voltage, electric current, the data processings such as electric energy, basic circuit diagram is as Fig. 5.

Wherein said MCU control circuit is made up of master chip and peripheral circuit, master chip selects the low-power consumption of Microchip company, high speed microprocessor controller PIC18F66K80, peripheral circuit comprises electrify restoration circuit, single threephase switch control circuit, liquid crystal display, clock chip, I2C storer, three phase metering chip circuit, the telecommunication circuit of the thermal printer of GPRS module M72-D and RS232 communication modes and power supply circuit, jointly complete the various functions of single three-phase electric energy meter detecting instrument, MCU control circuit theory diagram is as Fig. 6, MCU control circuit schematic diagram is as Fig. 7, master chip selects PIC18F66K80, PIC18F66K80 has 64 pins, there are 52 I/O mouths, four interruptions, 2 serial ports, 64K program storage, 3648 byte datas store, the 1024 erasable data fields of byte, 12 A/D conversions, wherein power supply circuit provides the 5V voltage needed for whole circuit working and the 4V voltage needed for GPRS module work.Electrify restoration circuit selects resistance 100K, the rc reset circuit of electric capacity 0.1U, can when powering on reliable reset, make MCU control circuit working properly; Toggle switch selected by single threephase switch control circuit, with the interruption 1 i.e. RB0/INT0 mouth line traffic control toggle switch of PIC18F66K80 chip, normal open connects three-phase electric energy, is connect single-phase electric energy during disconnection, press as long as toggle switch interrupts access, MCU chip is just corresponding to be processed; Liquid crystal display selects 5.1 cun of 600*480 resolution belt touch-screen LCD Liquid Crystal Modules, the embedded lcd drive chip RS8875 of LCD Liquid Crystal Module, MCU is connected with RS8875 in SPI mode, RS8875 drives LCD Liquid Crystal Module and LCD can be made directly to show, and the RC3 of MCU meets RS8875-SCL, and RC4 meets RS8875-SDO, RC5 meets RS8875-SDI, RC6 meets RS8875-SCS, and LCD Liquid Crystal Module shows the electric current of single three-phase electric energy meter detecting instrument, the various parameter such as voltage and electric energy; Clock chip selects RX8025, and the RD0 of MCU meets SDA, and RD1 meets SCL, and the INT1 of MCU meets INTA, and clock is connected with interrupt mode, can provide the time to MCU; I2C memory circuitry selects the RD5 of 1MK jumbo chip 24C1024, MCU to meet the WP of 24C1024, and RR6 meets SDA, and RD7 meets SCL, and end A0, A1, A2 ground connection is selected in address, and 24C1024 power down does not lose data, available storage data; Three phase metering chip circuit selects the ATT7022B of Zhuhai torch power, there is dsp processor its inside, can by electric current, voltage, electric energy and phase place are handled well in computation chip, MCU chip is connected by the RF0-RF3 of RF mouth with ATT7022B, the RF0 of MCU meets DOUT, RF1 meets DIN, and RF2 meets SCLK, and RF3 meets CS, MCU chip is connected in SPI mode with ATT7022B, MCU chip is by reading register in ATT7022B, and by electric current, the digital independent such as voltage and electric energy out and show in liquid crystal display; GPRS module in telecommunication circuit, selects M72-D module, communicates with serial communication mode with MCU chip, and wherein the RE6 of MCU meets the RXD of M72-D module, and RE7 meets the TXD of M72-D module, completes the remote transmission of single three-phase electric energy meter detecting instrument data; Thermal printer in telecommunication circuit, select embedded panel printer AB_W5820, with the communication of RS232 mode, the serial ports 1 of MCU master chip connects MAX232 chip, namely RG0/RX1 meets RX, and RG1/TX1 meets TX, connects transmission and the receiving end of thermal printer after voltage matches, complete serial communication, working power provides the 5V voltage of big current by electric power management circuit.

Described telecommunication circuit is a kind of serial communication circuit, telecommunication circuit utilizes Serial Port Line to be connected with MAX232 chip, and MAX232 exports and connects thermal printer, needs field data, by the direct print data of thermal printer, completes local communication; Serial Port Line is utilized to be connected with GPRS module, need long-range output, exported by remote data by GPRS module, GPRS module realizes telecommunication, and telecommunication circuit theory diagram is as Fig. 8, PIC18F66K80 master chip has two serial ports, a serial ports connects MAX232 chip, and receive reception and the transmitting terminal of MAX232 input respectively, the reception that MAX232 exports is connected embedded panel printer AB_W5820 with transmitting terminal, by data-printing out, telecommunication circuit schematic diagram is as Fig. 9; Another serial ports of PIC18F66K80 master chip meets GPRS module M72-D, serial ports RE5 meets RXD, and RE7 meets TXD, and GPRS module communicates with MCU master chip with serial mode, S2 is by key control GPRS module, be a kind of hardware reset circuit, button is contained on single three-phase electric energy meter detecting instrument panel, when having data communication, D15 pilot lamp is just glittering, GPRS module operating voltage is 4V, is supplied by electric power management circuit, and GPRS telecommunication circuit schematic diagram as shown in Figure 10.

Described electric power management circuit is made up of transformer and peripheral circuit, voltage conversion circuit and bleeder circuit, theory diagram is as Figure 11, power supply produces direct current 12V voltage through transformer and peripheral circuit, and power supply exports 12V alternating voltage after transformer, and 12V alternating voltage access diode carries out rectification, add filter capacitor and isolated DC electric capacity, export 12V DC voltage, A, B, C three-phase connection is identical, and schematic diagram is as Figure 12; Direct current 12V voltage exports the 4V voltage of big current after voltage-regulation chip MIC29302WU dividing potential drop, and provide normal working voltage to GPRS module, GPRS module voltage and current 500mA, maximum current 2A, sustainable 1ms, schematic diagram is as Figure 13; Direct current 12V voltage generates the 5V voltage of 2.5A through voltage step-down converter TPS54240, and provide normal working voltage to MCU control circuit and thermal printer, schematic diagram is as Figure 14.

Claims (5)

1. a single three-phase electric energy meter detecting instrument, it comprises electric quantity acquisition circuit, MCU control circuit, telecommunication circuit and electric power management circuit, it is characterized in that described single three-phase electric energy meter detecting instrument completes the various functions of single three-phase electric energy meter detecting instrument under the control of MCU master chip PIC18F66K80, be a kind of chip microcontroller on-line testing electric energy and by the hardware monitoring instrument of data-printing and transmission, wherein electric power management circuit provides stable voltage, its MCU control circuit is passed through the collection of electric quantity acquisition circuit realiration on-Line Voltage signal and current signal and is processed storage, and send the data detected to thermal printer and GPRS module by serial ports.

2. the single three-phase electric energy meter detecting instrument of one according to claim 1, is characterized in that, described electric quantity acquisition circuit is by current collection circuit, and voltage collection circuit and three-phase electrical energy computation chip composition, complete the collection of single three-phase electric energy meter detecting instrument electricity.

3. the single three-phase electric energy meter detecting instrument of one according to claim 1, it is characterized in that, wherein said MCU control circuit is made up of PIC18F66K80 master chip and peripheral circuit, completes the various functions of single three-phase electric energy meter detecting instrument.

4. the single three-phase electric energy meter detecting instrument of one according to claim 1, is characterized in that, wherein said telecommunication circuit is that one utilizes serial ports to carry out serial communication, and serial communication can complete on-the-spot output report by thermal printer; Serial communication also can realize telecommunication by GPRS module; Utilize Serial Port Line to be connected with MAX232 chip, MAX232 exports and connects thermal printer, completes local communication; Utilize Serial Port Line to be connected with GPRS module, GPRS module completes telecommunication.

5. the single three-phase electric energy meter detecting instrument of one according to claim 1, it is characterized in that, electric power management circuit comprises transformer and peripheral circuit, bleeder circuit and voltage conversion circuit, transformer and peripheral circuit export two-way 12V voltage, one tunnel exports 4V voltage after bleeder circuit, for GPRS module work; One tunnel exports 5V voltage after voltage conversion circuit, for MCU control circuit and the work of RS232 printer.