CN201247286Y - Electronic three-phase multifunctional electric energy meter - Google Patents
Electronic three-phase multifunctional electric energy meter Download PDFInfo
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- CN201247286Y CN201247286Y CNU2008201631843U CN200820163184U CN201247286Y CN 201247286 Y CN201247286 Y CN 201247286Y CN U2008201631843 U CNU2008201631843 U CN U2008201631843U CN 200820163184 U CN200820163184 U CN 200820163184U CN 201247286 Y CN201247286 Y CN 201247286Y
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Abstract
The utility model discloses an electronic three-phase multifunctional electric energy meter, which comprises a three-phase metering chip and a function processing chip with liquid crystal to drive, wherein the three-phase metering chip is connected on the input end of the function processing chip, the function processing chip is further connected with an impulse output circuit, an LCD display circuit, a memory, an infrared communication circuit, a RS 485 circuit and a clock chip with temperature compensation, wherein the three-phase metering chip adopts an ATT7022B chip, and the memory adopts a 24LC256I chip. Data of the ATT7022 chip is read out by the function processing chip through a serial line interface, the functions of time-sharing active energy measurement and maximum demand metering are finished according to real time of the clock chip with temperature compensation and period which is preset. Sampling resolution factors of voltage and current are high, enough time is left to measure electric data more accurately, and metering accuracy is obviously improved. The circuit can stably run in long term, and the production cost of the integral circuit is low.
Description
[technical field]
The utility model relates to the electric energy meter that is used for measuring electric weight, relates in particular to a kind of electronic type three-phase multifunctional electrical energy meter.
[background technology]
Though the existing various a lot of types of existing electronic type three-phase multifunctional electrical energy meter, ubiquity is reliable and stable inadequately, the problems such as measuring accuracy is poor, the souvenir power consumption is big, cost height of long-play under the different situation of dynamic range broad and external environment condition.
[summary of the invention]
The purpose of this utility model solves the problems of the prior art exactly, proposes a kind of electronic type three-phase multifunctional electrical energy meter, can improve measuring accuracy and long playing reliability, and cost is low.
For achieving the above object, the utility model proposes a kind of electronic type three-phase multifunctional electrical energy meter, the function treatment chip that comprises three phase metering chip, band liquid crystal drive, the three phase metering chip is connected the input end of function treatment chip, also be connected with the clock chip of impulse output circuit, LCD display circuit, storer, infrared communication circuit, RS485 circuit and band temperature compensation on the function treatment chip respectively, described three phase metering chip adopts the ATT7022B chip, and described storer adopts the 24LC256I chip.
As preferably, the input end of function treatment chip also is connected with button inputting circuits and negative phase sequence testing circuit.
As preferably, described function treatment chip adopts the NEC0537 chip.
As preferably, three line control circuits that described infrared communication circuit adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.
As preferably, described RS485 circuit adopts the MAX13485 chip.Only need a pair of twisted-pair feeder just can realize that the multisystem networking constitutes distributed system, equipment is simple, cheap, communication distance is long.
As preferably, the clock chip of described band temperature compensation adopts the DS3231 chip.
The beneficial effects of the utility model: the utility model voltage, electric current is after sample circuit is taken a sample respectively, sending into the three phase metering chip handles, and be converted into digital signal and deliver to the function treatment chip and calculate, the function treatment chip is read the data of ATT7022B chip by serial line interface, and finish metering of timesharing active energy and maximum demand metering function according to the real-time time of clock chip and the predefined period of band temperature compensation, as required to the storage access data, on the LCD of LCD display circuit liquid crystal, show every data, carry out the communication transmission by infrared communication circuit or RS485 circuit.Adopt high-precision measuring chip ATT7022B, make the electric current and voltage sampling resolution greatly improve, and have sufficient time to measure more accurately energy data, thereby make the accuracy of measuring of electric energy meter that remarkable improvement arranged.Circuit can long-time steady operation, and the entire circuit cost is low.
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the structural representation of the utility model electronic type three-phase multifunctional electrical energy meter.
[embodiment]
Consult Fig. 1, the electronic type three-phase multifunctional electrical energy meter, the function treatment chip 2 that comprises three phase metering chip 1, band liquid crystal drive, three phase metering chip 1 is connected the input end of function treatment chip 2, also be connected with the clock chip 8 of impulse output circuit 3, LCD display circuit 4, storer 5, infrared communication circuit 6, RS485 circuit 7 and band temperature compensation on the function treatment chip 2 respectively, described three phase metering chip 1 adopts the ATT7022B chip, and described storer 5 adopts the 24LC256I chip.The input end of described function treatment chip 2 also is connected with button inputting circuits 9 and negative phase sequence testing circuit 10.In electric energy meter when work,, voltage, electric current are sent into three phase metering chip 1 and are handled after sample circuit is taken a sample respectively, and are converted into digital signal and deliver to function treatment chip 2 and calculate.Owing to adopted special-purpose ATT7022B chip, made the electric current and voltage sampling resolution greatly improve, and have sufficient time to measure more accurately energy data, thereby make the accuracy of measuring of electric energy meter that remarkable improvement arranged.Function treatment chip 2 is used for time-shared charge and handles various inputoutput datas, by serial line interface the data of special-purpose electric energy chip are read, and finish metering of timesharing active energy and maximum demand metering function according to the real-time time of clock chip 8 and the predefined period of band temperature compensation, as required to storer 5 access datas, on the LCD of LCD display circuit 4 liquid crystal, show every data, carry out the communication transmission by infrared communication circuit 6 or RS485 circuit 7, and finish the monitoring of operational factor, the various data of recording storage.Described function treatment chip 2 adopts the NEC0537 chip.
The function of multifunctional electric energy meter is very powerful, also needs the measurement of the parameter of the energy of first-harmonic and harmonic wave and power etc. common active power that has except general ammeter and the reactive power, understands, the quality of power supply of monitoring electrical network.Harmonic wave mainly is that the converter of metallurgy, chemical industry, electric railway and other industries, non-consumer produce in the electric system.They inject harmonic current to utility network, produce harmonic voltage in utility network, and these consumers are called harmonic source.Wherein particularly serious harmonic source is the converter and the non-linear equipments such as electric arc furnaces, electric welding machine of silicon rectifier, silicon controlled rectifier.A large amount of harmonic currents flows into electrical network, produces the harmonic wave pressure drop under electric network impedance, on the electrical network first-harmonic that is added to, causes the grid voltage waveform distortion.Increase along with various nonlinear-loads such as the converter of silicon rectifier, silicon controlled rectifier, electric arc furnaces, electric welding machines; a large amount of harmonic currents flows into electrical network; cause the distortion of voltage sinusoidal waveform; the quality of power supply is descended; bring harm for power supply equipment, user power utilization equipment, electricity consumption metering, relay protection, become the public hazards of polluting electrical network.Harmonic wave makes that inductive load causes superpotential, capacitive load to cause excess current in the electrical network, influences electricity consumption metering correctness, and safe operation is brought harm.For example, make protective relaying maloperation, cause lightning arrester, isolating switch blast etc.; Intervene electronic equipment, make the computing machine misoperation, the electronic equipment false triggering; Make order circuit, weak electrical loop produce noise, even cause fault.Adopt the ATT7022B chip that first-harmonic and harmonic electric energy measurement function are provided specially, first-harmonic composition and harmonic components in the voltage and current can be separated, the metering of accurate fundamental power and fundamental energy directly is provided, the accurate metering of harmonic power and harmonic electric energy also can be provided.Can obtain simultaneously fundamental voltage effective value, current effective value or harmonic voltage effective value, current effective value equivalent and assess the quality of power supply of electrical network.
Multifunctional electric energy meter promptly needs the decompression detection line owing to will detect the size of the electric current under the situation that voltage has fallen.The decompression detection line is owing to will move under the situation of electric voltage dropping, so be exactly powered battery substantially, obtain a reference voltage value by cell voltage being carried out dividing potential drop, simultaneously to the detection of current terminal, two values were advanced comparer and were obtained a trigger pip, the output level of comparer has a saltus step when the sinusoidal wave peak value of current terminal surpasses reference voltage value, export to function treatment chip 2 after the wave shaping with comparer output again, change just explanation also has electric current under voltage situation about falling loss if function treatment chip 2 detects the level of full decompression test side when powered battery.
Entire circuit adopts linear power supply 11 and battery circuit 13 by electric power management circuit 12 power supplies.Adopt linear transformer step-down mode, the hermetically sealed mode of transformer adopting, clean and tidy reliable.Mu balanced circuit adopts common three-terminal voltage-stabilizing pipe 7805 voltage stabilizings, and output terminal also carries out filtering with filter inductance to voltage except electrochemical capacitor, guarantees the quality of output end voltage.The power supply of many rates each several part circuit is cut apart, work when powering on, the separately power supply of circuit of all working when following electricity idle circuit in back and power-on and power-off, the circuit that can work during power-on and power-off is according to the size of power consumption and separately power supply of the frequent degree of working, and the electric power thus supplied of each several part is controlled according to control circuit, when not needing to use certain partial circuit, can it not powered, accomplished possible minimum power consumption, to guarantee down the longest of battery operation life-span in when electricity; According to the significance level of operation of partial circuit his-and-hers watches meter and related data, it is powered simultaneously, guarantee not losing of time punctual timing and data with different power supplys.Power supply supply situation to infrared communication circuit 6 describes below: power consumption is bigger during owing to infrared operation, can reach tens milliamperes, so we separate with other parts the power supply of ammeter infrared part, the way that we adopt is that three-terminal voltage-stabilizing pipe 7805 lower margins are gone into ground behind 1N4007, so that its output voltage is about 5.7V, then 5.7V voltage is divided into different branches, the power supply of infrared part is branch wherein.The purpose that is divided into different branches is the power-supply fluctuation that as far as possible influences other parts during for each several part circuit working when powering on less, here particularly for part power consumption is bigger in short-term the circuit, another important consideration is a unidirectional conduction of utilizing branch's diode when following electricity back powered battery, can have at confession partial circuit power supply; Owing to for many rate scales, all may copy and accept the related data of ammeter at any time, externally have under electricity or the not electric situation no matter be, we provide with two joint 3V battery series connection back step-downs for infrared power supply in following electricity back, power consumption is too big when considering infrared operation simultaneously, battery electric quantity is limited, require ammeter not having long-time operation reliably under the situation of external power source, we utilize control circuit that this power supply is controlled at design, every regular hour unlatching infrared part power supply of crossing, infrared receiving tube work, power problems is also paid attention in the design of infrared control circuit very much, and current-limiting resistance selects big resistance as far as possible under the prerequisite that can normally control.If there is infrared operation the outside, receiving tube can receive signal, CPU powers for a long time to the infrared part circuit after confirming that infrared operation is arranged, after having that certain hour is infrared and not working, CPU is with infrared power-off, and then enter circulation: power supply opening, detect infrared, power remove, in such process of waiting for, up to the infrared signal that has next time, battery powered power consumption when above design of hardware and software can reduce not have external power source to greatest extent, ammeter working time when prolonging powered battery.
ATT7022B is a high precision three-phase electrical energy computation chip, is applicable to the application of phase three-wire three and three-phase and four-line electric energy meter; The integrated circuit such as digital signal processing of six road second order sigma-deltaADC, reference voltage circuit and all power, energy, effective value, power factor and frequency measurement, can measure each and reach active power, reactive power, applied power, meritorious energy and the quadergy of closing phase mutually, go back parameters such as each phase current of energy measurement, voltage effective value, power factor, phase angle, frequency simultaneously, fully satisfy the demand of three-phase compound tariff and multifunctional meter; Support gain, the phase correction in digital territory, promptly deposit the software calibration; Meritorious, reactive energy pulse output CF1, CF2 provide instantaneous meritorious, reactive power information, can directly receive standard scale and calibrate for error; Can be meritorious to first-harmonic, reactive power measures, and pulse output is provided, CF3 and CF4 provide instantaneous fundamental active power and fundamental wave reactive power power information, can be directly used in the correction of first-harmonic; The output of two class apparent energies is provided, and RMS apparent energy and PQS apparent energy, CF3 and CF4 also can be configured to apparent energy pulse output; A SPI interface is provided, carries out the transmission of measuring parameter and calibration parameter between convenience and the outside MCU, all measuring parameters can be read by the SPI interface; There is voltage detecting circuit inside, can guarantee to power up and operate as normal when cutting off the power supply.
Described storer 5 adopts the 24LC256I chip.24LC256I is the Low-Power CMOS serial EEPROM of U.S. Microchip company, it is to include 32K x 8 (256K bit) storage space, have operating voltage wide (2.5～5.5V), the fast characteristics such as (less than 5ms) of erasable (greater than 10000 times) often, writing speed.1,2,3 pin of 24LC256I are three address wires, be used for determining the hardware address of chip, the 8th pin and the 4th pin are respectively positive and negative power supply, the 5th pin SDA is the serial data I/O, data are by this two-way I2C bus serial transfer, the 6th pin SCL is the serial clock incoming line, SDA and SCL all need and positive supply between respectively connect on the resistance of a 10K and draw, the 7th pin needs ground connection.Have address register in the sheet among the 24LC256I.Whenever after writing or read a data byte, this address register adds 1 automatically, to realize the read-write to next storage unit.All bytes all read in the single operation mode.For reducing total write time, single job can write the nearly data of 8 bytes.
Three line control circuits that described infrared communication circuit 6 adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.Infrared communication circuit 6 is divided into and transmits and receives two parts.The radiated element of radiating portion is an infrarede emitting diode, and what it sent is infrared ray rather than visible light, and the Infrared wavelength that infrarede emitting diode commonly used sends is about 940nm, the about 100mW of emissive power.The infrared receiving tube of receiving circuit is a kind of photodiode, will add reverse biased to infrared receiving diode during use, and its could operate as normal and obtain high sensitivity.Because the emissive power of infrarede emitting diode is less, the signal that infrared receiving diode is received a little less than, so receiving end will increase the high-gain amplifying circuit.No matter yet now be amateurish the making or formal product, mostly adopt the integrated reception head of finished product.The integrated head that receives of infrared ray is the module that collects infrared reception, amplification, filtering and comparer output etc., stable performance, reliable.The infrared part circuit adopts three line control circuits, i.e. output (emission) is imported (reception) and is used single line with two lines, exports one of them mouthful and utilizes timer to export the 38K ripple always, another mouthful output sends signal waveform, can be regarded as the transmission of control 38K ripple; Receive owing to adopting integrated reception head, what arrive function treatment chip 2 pins is common level, so connect with a middle fracture, begins to receive infrared data when receiving to enter after level changes to break.
Described RS485 circuit 7 adopts the MAX13485 chip.RS485 circuit 7 is a kind of serial ports commonly used, has advantages such as network is easy to connect, good in anti-interference performance, long transmission distance.Use the networking of RS-485 bus, only need a pair of twisted-pair feeder just can realize that the multisystem networking constitutes distributed system, equipment is simple, cheap, communication distance is long.In application system, RS-485 half-duplex asynchronous communication bus is by the widely used data communication bus of each research and development institution, and it often is applied between centralized control hinge and the decentralised control unit.In order to realize the isolation of bus and function treatment chip system, between the asynchronous communication mouth of function treatment chip and MAX13485, adopt light-coupled isolation.Because in the application system, main frame and extension set are separated by far away, the total length of communication line is often above 400 meters, and subordinate machine system powers on or reset and usually do not finish in the same moment.If the DE terminal potential of MAX13485 is " 1 " at this moment, the output of its 485 buses will be in transmit status so, has just taken communication bus, and other extension set just can't communicate with main frame like this.This situation shows that especially (deadlock) under the abnormal conditions appears in certain extension set, can make total system communication collapse.Therefore when circuit design, the DE terminal potential of MAX13485 is " 0 " in the time of should guaranteeing system power-on reset.Because the function treatment chip is at reseting period, I/O mouth output high level is so the connection of circuit solves the problem that the reseting period extension set " is stung " bus effectively.The design of output circuit will fully take into account the various interference on the circuit and the coupling of line characteristic impedance.Because the engineering-environment more complicated, often there are various forms of interference sources at the scene, so the transmission ends of 485 buses must be added with safeguard measure.In circuit design, can select for use can antisurge TVS transient state clutter suppresor spare, consider the special circumstances (as the breakdown short circuit of 485 chips of a certain table) of circuit, for preventing that the communication of other extension set is affected in the bus, at two thermistors of 485 signal output parts series connection of MAX13485.The hardware fault of this sample machine just can not make the communication of whole bus be affected.
The foregoing description is to explanation of the present utility model, is not to qualification of the present utility model, any structure after the utility model simple transformation is all belonged to protection domain of the present utility model.
Claims (6)
1. electronic type three-phase multifunctional electrical energy meter, it is characterized in that: the function treatment chip (2) that comprises three phase metering chip (1), band liquid crystal drive, three phase metering chip (1) is connected the input end of function treatment chip (2), also be connected with the clock chip (8) of impulse output circuit (3), LCD display circuit (4), storer (5), infrared communication circuit (6), RS485 circuit (7) and band temperature compensation on the function treatment chip (2) respectively, described three phase metering chip (1) adopts the ATT7022B chip, and described storer (5) adopts the 24LC256I chip.
2. electronic type three-phase multifunctional electrical energy meter as claimed in claim 1 is characterized in that: the input end of described function treatment chip (2) also is connected with button inputting circuits (9) and negative phase sequence testing circuit (10).
3. electronic type three-phase multifunctional electrical energy meter as claimed in claim 1 is characterized in that: described function treatment chip (2) adopts the NEC0537 chip.
4. electronic type three-phase multifunctional electrical energy meter as claimed in claim 1 is characterized in that: three line control circuits that described infrared communication circuit (6) adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.
5. electronic type three-phase multifunctional electrical energy meter as claimed in claim 1 is characterized in that: described RS485 circuit (7) adopts the MAX13485 chip.
6. as any one described electronic type three-phase multifunctional electrical energy meter in the claim 1 to 5, it is characterized in that: the clock chip of described band temperature compensation (8) adopts the DS3231 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201631843U CN201247286Y (en) | 2008-08-25 | 2008-08-25 | Electronic three-phase multifunctional electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201631843U CN201247286Y (en) | 2008-08-25 | 2008-08-25 | Electronic three-phase multifunctional electric energy meter |
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| CN201247286Y true CN201247286Y (en) | 2009-05-27 |
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| CNU2008201631843U Expired - Fee Related CN201247286Y (en) | 2008-08-25 | 2008-08-25 | Electronic three-phase multifunctional electric energy meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053237A (en) * | 2009-10-31 | 2011-05-11 | 郑州三足科技发展有限公司 | Remote on-line detection system of electric energy metering device |
| CN113702896A (en) * | 2021-07-13 | 2021-11-26 | 中国电力科学研究院有限公司 | System and method for measuring error of direct current electric energy standard meter based on voltage reference |
| CN113702896B (en) * | 2021-07-13 | 2024-04-19 | 中国电力科学研究院有限公司 | System and method for measuring direct-current electric energy standard meter error based on voltage reference |
-
2008
- 2008-08-25 CN CNU2008201631843U patent/CN201247286Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053237A (en) * | 2009-10-31 | 2011-05-11 | 郑州三足科技发展有限公司 | Remote on-line detection system of electric energy metering device |
| CN113702896A (en) * | 2021-07-13 | 2021-11-26 | 中国电力科学研究院有限公司 | System and method for measuring error of direct current electric energy standard meter based on voltage reference |
| CN113702896B (en) * | 2021-07-13 | 2024-04-19 | 中国电力科学研究院有限公司 | System and method for measuring direct-current electric energy standard meter error based on voltage reference |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090527 Termination date: 20170825 |
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| CF01 | Termination of patent right due to non-payment of annual fee |