CN204514991U - A kind of intelligent electric meter - Google Patents
A kind of intelligent electric meter Download PDFInfo
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- CN204514991U CN204514991U CN201520188933.8U CN201520188933U CN204514991U CN 204514991 U CN204514991 U CN 204514991U CN 201520188933 U CN201520188933 U CN 201520188933U CN 204514991 U CN204514991 U CN 204514991U
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Abstract
The utility model discloses a kind of intelligent electric meter, it includes MCU module and power module, and what MCU module connected has display module, key-press module, communication module, current acquisition module, voltage acquisition module and temperature sensing module.MCU module comprises STC12C5A40AD, and there is EEPROM function its inside.Display module is made up of LED charactron and triode, key-press module is microswitch composition, communication module uses MAX485 conversion, current acquisition module is made up of current transformer/sampling resistor and RC filter network, voltage acquisition module is made up of voltage transformer (VT)/divider resistance and RC filter network, sends into ATT7053BU process after voltage, current signal collection.The utility model reliable design, precision are high, multiple functional, can be used for measuring indicating instrument and relevant auxiliary unit.
Description
Technical field
The utility model relates to electric-power metering field, especially relates to a kind of intelligent electric meter.
Background technology
In electric instrument industry, traditional motor meter eliminate by electronic electricity meter.Electronic instrument technology maturation in the market, precision is high, good reliability, can telecommunication, and be widely used space, and along with the demand in power industry and market, instrument is just towards intellectuality, high precision, multi-functional, radio meter register future development.Because electronic instrument exists plurality of advantages in all fields, especially can telecommunication, can realize electric power monitoring centralization, therefore electronic instrument substitutes traditional Ferraris instrument is inexorable trend.
Summary of the invention
The utility model mainly solves the not high enough technical matters of intelligence degree existing for prior art, provides that a kind of precision is high, the intelligent electric meter of good reliability.
The utility model is mainly solved by following technical proposals for above-mentioned technical matters: a kind of intelligent electric meter, the power module comprising MCU module, display module, key-press module, communication module, current acquisition module, voltage acquisition module, electric-power metering module and power for whole intelligent electric meter, described display module, key-press module, communication module are all connected with MCU module with electric-power metering module, and described current acquisition module and voltage acquisition module are connected to electric-power metering module.
MCU module is the work controlling other modules.The parameter of display module display intelligent electric meter and state.Key-press module is used for carrying out setup control.Communication module realizes the communication between intelligent electric meter and host computer.Current acquisition module acquires current flow, voltage acquisition module gathers current voltage, sends to MCU module after the output data of electric-power metering module to current acquisition module and voltage acquisition module process.Whole electric-power metering process is completed by intelligent electric meter completely, does not need artificial participation.
As preferably, described MCU module comprises STC12C5A40AD chip.STC12C5A40AD chip internal carries data-carrier store, and power down can preserve data.STC12C5A40AD is 8051 kernel MCU, and more traditional 8051 kernel operating rates are fast, and processing power is stronger.
As preferably, described display module comprises two 3 Digital sum pipes, 7 models are the triode of S9012,7 light emitting diodes and several resistance; 8 pin of 3 Digital sum pipes, 9 pin and 12 pin are respectively connected the collector of a triode, and all the other pin are all connected to MCU module by resistance; The positive pole of 7 light emitting diodes is all connected to the collector of a triode; Negative pole is all connected to MCU module by resistance; The emitter of triode all connects power supply+5V, and base stage is all connected to MCU module by resistance.
MCU module drives 3 Digital sum pipe and light emitting diodes by triode.
As preferably, described key-press module comprises 5 microswitches and 5 pull-up resistors, and the first end of each microswitch is connected to MCU module, the second end all ground connection, the first end of each pull-up resistor connects the first end of a microswitch separately, and the second end of pull-up resistor all connects power supply+5V.
Display module and key-press module coordinate and can show different parameters intuitively, adopt charactron and LED light to show temperature influence little.
As preferably, described communication module comprises opto-coupler chip, MAX485 chip and Transient Suppression Diode, described opto-coupler chip is TLP521-3-D chip, 2 pin of opto-coupler chip are connected MCU module with 6 pin by resistance, 10 pin directly connect MCU module, 1 pin is connected power supply VCC with 5 pin, and 3 pin connect power supply VCC_D, and 4 pin connect 1 pin of MAX485 chip by resistance; 12 pin of opto-coupler chip connect 4 pin of MAX485 chip, and 8 pin of opto-coupler chip connect 2 pin and 3 pin of MAX485 chip; 7 pin of opto-coupler chip are connected power supply GND_D with 11 pin, 9 pin ground connection; 12 pin of opto-coupler chip also connect power supply VCC_D by resistance, and 10 pin also connect power supply VCC by resistance, and 8 pin also connect power supply VCC_D by resistance; 8 pin of MAX485 chip connect power supply VCC_D, and 7 pin and 6 pin are the output port of communication module, and 5 pin connect power supply GND_D; Transient Suppression Diode is connected across between 6 pin of MAX485 chip and 7 pin, is also serially connected with resistance R22 between 6 pin of MAX485 chip and 7 pin; 8 pin of MAX485 chip also connect power supply GND_D by electric capacity C23, and 7 pin also connect power supply GND_D by resistance R24, and 6 pin also connect power supply VCC_D by resistance R21; Resistance R25 one end connects power supply GND_D, other end ground connection.
Communicated by RS485 agreement between communication module and host computer.
As preferably, described current acquisition module comprises current transformer, resistance R27, resistance R31, resistance R35, resistance R36, resistance R38, resistance R40, resistance R43, resistance R46, variable resistor R28, electric capacity C32, electric capacity C34 and electric capacity C35, described current transformer is HWCT-20A/20mA mutual inductor, 5 pin of current transformer and 6 pin are alternating current incoming end, 2 pin connect convertible tip and the first definite value end of variable resistor R28, and 1 pin connects the second definite value end of variable resistor R28 by resistance R35; The first end of resistance R31 connects 2 pin of current transformer, the second end ground connection; The first end of resistance R36 connects 1 pin of current transformer, the second end ground connection; The first end of resistance R27 connects 2 pin of current transformer; The first end of resistance R38 connects 1 pin of current transformer, and second end of resistance R27 and second end of resistance R38 are alternating current output terminal; Second end of the first end contact resistance R27 of electric capacity C32, the second end ground connection of electric capacity C32; Second end of the first end contact resistance R38 of electric capacity C35, the second end ground connection of electric capacity C35; Electric capacity C34 is connected across between second end of resistance R27 and second end of resistance R38; The two ends of resistance R43 are DC current incoming end, the first end of the first end contact resistance R43 of resistance R40; Second end of the first end contact resistance R43 of resistance R46, second end of resistance R40 and second end of resistance R46 are DC current output terminal.
As preferably, described voltage acquisition module comprises voltage transformer (VT), resistance R26, resistance R30, resistance R32, resistance R33, resistance R34, resistance R37, resistance R39, resistance R41, resistance R42, resistance R44, resistance R45, variable resistor R29, electric capacity C31, electric capacity C33 and electric capacity C36, and described voltage transformer (VT) is TV1005 mutual inductor; 2 pin of voltage transformer (VT) are the first alternating voltage incoming end, and 1 pin connects the second alternating voltage incoming end by resistance R32; 4 pin of voltage transformer (VT) connect convertible tip and the first definite value end of variable resistor R29, and 3 pin connect the second definite value end of variable resistor R29 by resistance R33; The first end of resistance R30 connects 4 pin of voltage transformer (VT), the second end ground connection; The first end of resistance R34 connects 3 pin of voltage transformer (VT), the second end ground connection; The first end of resistance R26 connects 4 pin of voltage transformer (VT); The first end of resistance R37 connects 3 pin of voltage transformer (VT), and second end of resistance R26 and second end of resistance R37 are ac voltage output; Second end of the first end contact resistance R26 of electric capacity C31, the second end ground connection of electric capacity C31; Second end of the first end contact resistance R37 of electric capacity C36, the second end ground connection of electric capacity C36; Electric capacity C33 is connected across between second end of resistance R26 and second end of resistance R37; The first end of resistance R39 is the first DC voltage incoming end, and the second end is by the first end of resistance R41 contact resistance R42; The first end of resistance R45 is the second DC voltage incoming end, and second end of resistance R42 and second end of resistance R45 are DC voltage output end; Resistance R44 is connected across between the first end of resistance R42 and the first end of resistance R45.
This intelligent electric meter can measure alternating current or direct current.When measure alternating current time, current acquisition module alternating current incoming end access test line, alternating current output terminal is connected to electric-power metering module, DC current incoming end and DC current output terminal unsettled; First alternating voltage incoming end of voltage measurement module and the second alternating voltage incoming end access test line, ac voltage output connects electric-power metering module, and the first DC voltage incoming end, the second DC voltage incoming end and DC voltage output end are all unsettled.When measure direct current time, current acquisition module DC current incoming end access test line, DC current output terminal is connected to electric-power metering module, alternating current incoming end and alternating current output terminal unsettled; First DC voltage incoming end of voltage measurement module and the second DC voltage incoming end access test line, DC voltage output end connects electric-power metering module, and the first alternating voltage incoming end, the second alternating voltage incoming end and ac voltage output are all unsettled.
As preferably, described electric-power metering module comprises ATT7053BU chip, 6 pin of described ATT7053BU chip are connected ac voltage output or the DC voltage output end of voltage acquisition module with 7 pin, 10 pin are connected alternating current output terminal or the DC current output terminal of current acquisition module with 11 pin.
Current acquisition module and voltage acquisition module share ATT7053BU.Described MCU module and described ATT7053BU adopt SPI serial communication, and described current acquisition module and voltage acquisition module mutual inductor export the differential signal after resistance capacity filter and send into ATT7053BU chip pin.
ATT7053BU is professional electric energy computation chip, the measurement that alternating voltage, electric current, active power, reactive power, apparent merit, power factor and electric energy also can realize DC voltage, electric current and power can be realized, this chip detection precision is high, good stability, reliability are high, external devices is few, and circuit design is greatly simplified.
MCU module, by connecting ATT7053BU computation chip, by the data reading in ATT7053BU, can calculate the parameters such as voltage, electric current, power.
As preferably, intelligent electric meter also comprises temperature sensing module, and described temperature sensing module is connected with MCU module.
Temperature sensing module collecting temperature information sends to MCU module.
The intelligent electric meter of this programme uses voltage, electric power, power, power factor, active power and the reactive power that can measure alternating current during mutual inductor input, use during pure resistance input and can measure DC voltage, electric current can support 485 communications, the versatility of hardware obtains good utilization.
The beneficial effect that the utility model brings is, intelligence degree and precision high, good reliability, multiple functional, can be used for measuring indicating instrument and relevant auxiliary unit.
Accompanying drawing explanation
Fig. 1 is a kind of system module figure of the present utility model;
Fig. 2 is the circuit structure diagram of a kind of MCU module of the present utility model;
Fig. 3 is the circuit structure diagram of a kind of display module of the present utility model;
Fig. 4 is the circuit structure diagram of a kind of key-press module of the present utility model;
Fig. 5 is the circuit structure diagram of a kind of communication module of the present utility model;
Fig. 6 is the circuit structure diagram of a kind of current acquisition module of the present utility model;
Fig. 7 is the circuit structure diagram of a kind of voltage acquisition module of the present utility model;
Fig. 8 is the circuit structure diagram of a kind of electric-power metering module of the present utility model;
In figure: 1, MCU module, 2, power module, 3, display module, 4, key-press module, 5, communication module, 6, current acquisition module, 7, voltage acquisition module, 8, electric-power metering module, 9, temperature sensing module.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of intelligent electric meter of the present embodiment, as shown in Figure 1, comprises MCU module 1, power module 2, display module 3, key-press module 4, communication module 5, current acquisition module 6, voltage acquisition module 7, electric-power metering module 8 and temperature sensing module 9.Display module 3, key-press module 4, communication module 5, electric-power metering module 8 are all connected with MCU module 1 with temperature sensing module 9, and current acquisition module 6 and voltage acquisition module 7 are connected to electric-power metering module 8.
MCU module comprises STC12C5A40AD chip, and inside carries data-carrier store.Electric-power metering module comprises ATT7053BU chip.Current acquisition module includes single-phase current transformer and copper-manganese sampling resistor, current transformer is used for detecting alternating current, copper-manganese sampling resistor is used for detecting DC current, when gathering DC current, copper-manganese sampling resistor is installed, install current transformer when detecting alternating current, the current signal collected accesses 10 ~ 11 pin of ATT7053BU chip through capacitance-resistance filter and difference sample circuit correspondence.Voltage acquisition module includes single-phase potential transformer and divider resistance, when detecting single-phase AC voltage, voltage transformer (VT) is installed, install divider resistance when detecting DC voltage, the voltage signal collected is by 6 ~ 7 pin of access ATT7053BU chip corresponding after capacitance-resistance filter.
ATT7053BU integrated chip electric energy metrical, reliable operation, superior performance, with low cost, module is enriched, and inner integrated high-precision A/D and RMS-DC converter coordinate the detection that can realize the signal such as electric current, voltage easily with MCU.STC12C5A40AD inside comprises EEPROM function, and power failure data can continue to preserve; The electric current that ATT7053BU connects, voltage acquisition module are kept at internal register by after the signal transacting of detection, the register that MCU reads ATT7053BU inside by SPI serial line interface can obtain the data such as electric current, voltage, data through MCU process communicate with PC by order wire, and PC monitors parameters of electric power.
Power module be designed to by single-phase voltage through step-down transformer step-down, rectification, filtering, voltage stabilizing again give system power supply.For simplifying Power Management Design, MCU module and electric current, voltage acquisition module all select 5V power supply chip, STC12C5A40AD power pins 38 adds C26 filter capacitor, ATT7053BU digital power pin 1 adds C17 filter capacitor, analog power adds R19, C24 and forms RC wave filter, and ATT7053BU carries out single-point altogether in analog with digitally.
Fig. 3 is display module, S9012 is adopted to drive CPS05631BR model LED charactron and light emitting diode, circuit is simple and reliable, electric current, voltage, active power, reactive power, applied power, power factor can be shown when doing ac power meter, and on charactron, what data of thing of display can be found out intuitively, make to use convenient, LED light can Displaying Meter state, and can simply determine is automatic/hand range and current residing range ability.
Fig. 4 is key-press module, uses microswitch, adds external pull-up resistor to improve interference free performance.
Fig. 5 is communication module; MAX485 is adopted to carry out electric protocol transform; MAX485 uses independent power supply; MCU Serial Port Line RX/TX realizes being connected with MAX485 by light-coupled isolation; MAX485 differential lines A/B uses P6KE6.8CA protection; RS485 communication uses independent MCU pin control data transmission direction, to ensure to do certain time-delay when receiving/sending data mode and switch, ensures that data transmission is reliable and stable.Use RS485 communication can realize remote reading instrument data, can multiple instrument in parallel on data line, the address of each instrument can be set.
Fig. 6 is current acquisition module, alternating current is detected and makes Current Transformer, the output signal of current transformer is through a RC filter network filtering garbage signal, the signal exported after filtering is differential signal, differential signal is connected to the pin 10 ~ 11 of ATT7053BU, the adjustment outputing signal size can be realized by regulating the adjustable resistance of RC filter network, calibrate time by regulating this potentiometer can realize calibration easily; Detection for DC current uses copper-manganese sampling resistor to detect, and resistance sampling signal is through the pin 10 ~ 11 of RC filtered differential signal access ATT7053BU, and the data collected are treated to effective value automatically in ATT7053BU inside; Collection for alternating current and DC current signal can only choose one of two, and need carry out Selective Soldering time therefore hard-wired.
Fig. 7 is voltage acquisition module, alternating voltage is detected and uses voltage transformer (VT), the output signal of voltage transformer (VT) is through a RC filter network filtering garbage signal, the signal exported after filtering is differential signal, differential signal is connected to the pin 6 ~ 7 of ATT7053BU, the adjustment outputing signal size can be realized by regulating the adjustable resistance of RC filter network, calibrate time by regulating this potentiometer can realize calibration easily; Detection for DC voltage uses R39, R41, R44 metalfilmresistor to carry out dividing potential drop detection, potential-divider network makes input impedance > 1Mohm, R34 resistance sampling signal is through the pin 6 ~ 7 of RC filtered differential signal access ATT7053BU, and the data collected are treated to effective value automatically in ATT7053BU inside; Collection for alternating current and d. c. voltage signal can only choose one of two, and need carry out Selective Soldering time therefore hard-wired.
Fig. 8 is electric-power metering module, the reset of described ATT7053BU adopts outside RC electrification reset, digital power DVCC and analog power AVCC use RC wave filter to be connected, and internal reference output pin VREF uses the electric capacity of 10uF and 0.1uF to carry out filtering to increase the reliability of benchmark.In the present embodiment, the digital circuits section of ATT7053BU adopts single-point altogether, to improve system stability with simulation part (containing electric current, power supply acquisition module).
The data encryption and transmission method of intelligent electric meter comprises the following steps:
A, host computer generate the random integers N of 0 to 8, send to intelligent electric meter;
B, intelligent electric meter store No. 2+N of this metering cycle and upload the maximum temperature K1 detected the previous day, store at No. 11+N and upload the maximum temperature K2 detected the previous day, store at No. 20+N and upload the maximum temperature K3 detected the previous day, the destination end uploaded is host computer;
C, intelligent electric meter be maximum current I1 in the electricity consumption number of degrees W1 read day of checking meter in this metering cycle and this metering cycle, K1, K2 and K3 of being encrypted after the packing of two data, key is the electricity consumption number of degrees W0 of a upper metering cycle, uploading in the maximum current I0 of a upper metering cycle and this metering cycle;
D, intelligent electric meter by encryption after data upload to host computer;
E, host computer receive data and use corresponding double secret key data deciphering later, and the data after deciphering are stored, and then enter steps A.
The data of host computer after receiving encryption also generate random number and send to intelligent electric meter after successful decryption.Day of such as checking meter is No. 10 of every month, host computer receives intelligent electric meter after March 10 reading and encrypted the data uploaded, to data deciphering, successful decryption then generates random number, if the random number generated is 4, then intelligent electric meter uploaded the maximum temperature K2 on March 14 March 15, uploaded the maximum temperature K3 on March 23 March 24, uploaded the maximum temperature K1 on April 5 April 6.Temperature data is collected by temperature sensing module.
Metering cycle is two adjacent times of checking meter between day, and after intelligent electric meter reads and terminates, this metering cycle terminates, and enters next metering cycle.
During to April 10, to electricity used during current checking meter after intelligent electric meter reads and checked meter March 10, and maximum current interior during this period of time, then use secret key encryption.Encryption can make to complete with the following methods: by W0, I0, K1, K2 and K3 cascade, character string cascade obtained carries out MD5 computing, get operation result front 56 as secondary key, the data after the electricity consumption number of degrees W1 using secondary key to be obtained checking meter April 10 by des encryption algorithm and maximum current I1 is packed are encrypted.
Intelligent electric meter is by the data upload after encryption, host computer transfers W0, I0, K1, K2 and K3 from database, and correspondence is decrypted and obtains W1 and I1, is then stored by W1 and I1, and regenerate random number and send to intelligent electric meter, as the N of April 10 to this metering cycle on the 10th in May.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ the term such as MCU, electric-power metering herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (9)
1. an intelligent electric meter, it is characterized in that, the power module comprising MCU module, display module, key-press module, communication module, current acquisition module, voltage acquisition module, electric-power metering module and power for whole intelligent electric meter, described display module, key-press module, communication module are all connected with MCU module with electric-power metering module, and described current acquisition module and voltage acquisition module are connected to electric-power metering module.
2. a kind of intelligent electric meter according to claim 1, is characterized in that, described MCU module comprises STC12C5A40AD chip.
3. a kind of intelligent electric meter according to claim 1 and 2, is characterized in that, described display module comprises two 3 Digital sum pipes, 7 models are the triode of S9012,7 light emitting diodes and several resistance; 8 pin of 3 Digital sum pipes, 9 pin and 12 pin are respectively connected the collector of a triode, and all the other pin are all connected to MCU module by resistance; The positive pole of 7 light emitting diodes is all connected to the collector of a triode; Negative pole is all connected to MCU module by resistance; The emitter of triode all connects power supply+5V, and base stage is all connected to MCU module by resistance.
4. a kind of intelligent electric meter according to claim 1, it is characterized in that, described key-press module comprises 5 microswitches and 5 pull-up resistors, the first end of each microswitch is connected to MCU module, second end all ground connection, the first end of each pull-up resistor connects the first end of a microswitch separately, and the second end of pull-up resistor all connects power supply+5V.
5. a kind of intelligent electric meter according to claim 1 or 4, it is characterized in that, described communication module comprises opto-coupler chip, MAX485 chip and Transient Suppression Diode, described opto-coupler chip is TLP521-3-D chip, 2 pin of opto-coupler chip are connected MCU module with 6 pin by resistance, and 10 pin directly connect MCU module, and 1 pin is connected power supply VCC with 5 pin, 3 pin connect power supply VCC_D, and 4 pin connect 1 pin of MAX485 chip by resistance; 12 pin of opto-coupler chip connect 4 pin of MAX485 chip, and 8 pin of opto-coupler chip connect 2 pin and 3 pin of MAX485 chip; 7 pin of opto-coupler chip are connected power supply GND_D with 11 pin, 9 pin ground connection; 12 pin of opto-coupler chip also connect power supply VCC_D by resistance, and 10 pin also connect power supply VCC by resistance, and 8 pin also connect power supply VCC_D by resistance; 8 pin of MAX485 chip connect power supply VCC_D, and 7 pin and 6 pin are the output port of communication module, and 5 pin connect power supply GND_D; Transient Suppression Diode is connected across between 6 pin of MAX485 chip and 7 pin, is also serially connected with resistance R22 between 6 pin of MAX485 chip and 7 pin; 8 pin of MAX485 chip also connect power supply GND_D by electric capacity C23, and 7 pin also connect power supply GND_D by resistance R24, and 6 pin also connect power supply VCC_D by resistance R21; Resistance R25 one end connects power supply GND_D, other end ground connection.
6. a kind of intelligent electric meter according to claim 1, it is characterized in that, described current acquisition module comprises current transformer, resistance R27, resistance R31, resistance R35, resistance R36, resistance R38, resistance R40, resistance R43, resistance R46, variable resistor R28, electric capacity C32, electric capacity C34 and electric capacity C35, described current transformer is HWCT-20A/20mA mutual inductor, 5 pin of current transformer and 6 pin are alternating current incoming end, 2 pin connect convertible tip and the first definite value end of variable resistor R28, 1 pin connects the second definite value end of variable resistor R28 by resistance R35, the first end of resistance R31 connects 2 pin of current transformer, the second end ground connection, the first end of resistance R36 connects 1 pin of current transformer, the second end ground connection, the first end of resistance R27 connects 2 pin of current transformer, the first end of resistance R38 connects 1 pin of current transformer, and second end of resistance R27 and second end of resistance R38 are alternating current output terminal, second end of the first end contact resistance R27 of electric capacity C32, the second end ground connection of electric capacity C32, second end of the first end contact resistance R38 of electric capacity C35, the second end ground connection of electric capacity C35, electric capacity C34 is connected across between second end of resistance R27 and second end of resistance R38, the two ends of resistance R43 are DC current incoming end, the first end of the first end contact resistance R43 of resistance R40, second end of the first end contact resistance R43 of resistance R46, second end of resistance R40 and second end of resistance R46 are DC current output terminal.
7. a kind of intelligent electric meter according to claim 1, it is characterized in that, described voltage acquisition module comprises voltage transformer (VT), resistance R26, resistance R30, resistance R32, resistance R33, resistance R34, resistance R37, resistance R39, resistance R41, resistance R42, resistance R44, resistance R45, variable resistor R29, electric capacity C31, electric capacity C33 and electric capacity C36, and described voltage transformer (VT) is TV1005 mutual inductor; 2 pin of voltage transformer (VT) are the first alternating voltage incoming end, and 1 pin connects the second alternating voltage incoming end by resistance R32; 4 pin of voltage transformer (VT) connect convertible tip and the first definite value end of variable resistor R29, and 3 pin connect the second definite value end of variable resistor R29 by resistance R33; The first end of resistance R30 connects 4 pin of voltage transformer (VT), the second end ground connection; The first end of resistance R34 connects 3 pin of voltage transformer (VT), the second end ground connection; The first end of resistance R26 connects 4 pin of voltage transformer (VT); The first end of resistance R37 connects 3 pin of voltage transformer (VT), and second end of resistance R26 and second end of resistance R37 are ac voltage output; Second end of the first end contact resistance R26 of electric capacity C31, the second end ground connection of electric capacity C31; Second end of the first end contact resistance R37 of electric capacity C36, the second end ground connection of electric capacity C36; Electric capacity C33 is connected across between second end of resistance R26 and second end of resistance R37; The first end of resistance R39 is the first DC voltage incoming end, and the second end is by the first end of resistance R41 contact resistance R42; The first end of resistance R45 is the second DC voltage incoming end, and second end of resistance R42 and second end of resistance R45 are DC voltage output end; Resistance R44 is connected across between the first end of resistance R42 and the first end of resistance R45.
8. a kind of intelligent electric meter according to claim 6 or 7, it is characterized in that, described electric-power metering module comprises ATT7053BU chip, 6 pin of described ATT7053BU chip are connected ac voltage output or the DC voltage output end of voltage acquisition module with 7 pin, 10 pin are connected alternating current output terminal or the DC current output terminal of current acquisition module with 11 pin.
9. a kind of intelligent electric meter according to claim 1, is characterized in that, also comprise temperature sensing module, and described temperature sensing module is connected with MCU module.
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| CN105429096A (en) * | 2015-12-18 | 2016-03-23 | 杭州意聚电子技术有限公司 | Over-current protection method for ammeter and over-current protection circuit |
| CN105866539A (en) * | 2016-06-14 | 2016-08-17 | 河北箱变电器有限公司 | Electric quantity measuring instrument for electric power system |
| CN106154030A (en) * | 2015-03-30 | 2016-11-23 | 杭州力控科技有限公司 | A kind of intelligent electric meter and data encryption and transmission method thereof |
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| CN110579634A (en) * | 2019-10-29 | 2019-12-17 | 南京迪港科技有限责任公司 | Intelligent acquisition device for machine room |
| CN110907698A (en) * | 2019-11-22 | 2020-03-24 | 国网浙江省电力有限公司电力科学研究院 | Electric energy metering device for direct current distribution network |
| CN110988460A (en) * | 2019-12-05 | 2020-04-10 | 国网江苏省电力有限公司泰州供电分公司 | Be applied to two core smart electric meters of marketing and distribution integration |
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2015
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| CN106154030A (en) * | 2015-03-30 | 2016-11-23 | 杭州力控科技有限公司 | A kind of intelligent electric meter and data encryption and transmission method thereof |
| CN106154030B (en) * | 2015-03-30 | 2019-08-20 | 杭州力控科技有限公司 | A kind of intelligent electric meter and its data encryption and transmission method |
| CN105429096A (en) * | 2015-12-18 | 2016-03-23 | 杭州意聚电子技术有限公司 | Over-current protection method for ammeter and over-current protection circuit |
| CN105429096B (en) * | 2015-12-18 | 2018-05-15 | 华立科技股份有限公司 | A kind of ammeter over-current protection method and current foldback circuit |
| CN105866539A (en) * | 2016-06-14 | 2016-08-17 | 河北箱变电器有限公司 | Electric quantity measuring instrument for electric power system |
| CN109581019A (en) * | 2018-12-06 | 2019-04-05 | 安徽凯川电力保护设备有限公司 | A kind of current collection circuit mixing instrument |
| CN110579634A (en) * | 2019-10-29 | 2019-12-17 | 南京迪港科技有限责任公司 | Intelligent acquisition device for machine room |
| CN110907698A (en) * | 2019-11-22 | 2020-03-24 | 国网浙江省电力有限公司电力科学研究院 | Electric energy metering device for direct current distribution network |
| CN110907698B (en) * | 2019-11-22 | 2021-11-09 | 国网浙江省电力有限公司营销服务中心 | Electric energy metering device for direct current distribution network |
| CN110988460A (en) * | 2019-12-05 | 2020-04-10 | 国网江苏省电力有限公司泰州供电分公司 | Be applied to two core smart electric meters of marketing and distribution integration |
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