CN201247272Y - Electronic type single-phase multi-fee-rate electric energy meter - Google Patents
Electronic type single-phase multi-fee-rate electric energy meter Download PDFInfo
- Publication number
- CN201247272Y CN201247272Y CNU2008201630037U CN200820163003U CN201247272Y CN 201247272 Y CN201247272 Y CN 201247272Y CN U2008201630037 U CNU2008201630037 U CN U2008201630037U CN 200820163003 U CN200820163003 U CN 200820163003U CN 201247272 Y CN201247272 Y CN 201247272Y
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- energy meter
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Abstract
The utility model discloses an electronic type single-phase multi-rate electric energy meter, which comprises a single-phase metering chip and an M C U with the liquid crystal driving, wherein the single-phase metering chip is connected on the input end of the M C U, and the M C U is respectively connected with a pulse output circuit, an L C D display circuit, a memory, an infrared communication circuit, an R S 485 circuit and a clock chip thereon, wherein the single-phase metering chip adopts an A D E 7755 chip. Voltage and current of utility model are transmitted to the single-phase metering chip to be processed after being sampled by a sampling circuit, then are transformed into digital signals, and then are transmitted to the M C U to calculate, and data of the A D E 7755 chip is read by the M C U. The metering chip A D E 7755 with high precision from the A D company is adopted to greatly increase the sampling resolution factor of the voltage and current, and to provide enough time for staff to accurately measure the electric energy data, thereby significantly improving the metering accuracy of the electric energy meter. The circuits can stably operate for long time, and the whole circuit has low cost.
Description
[technical field]
The utility model relates to the electric energy meter that is used for measuring electric weight, relates in particular to the single-phase multi-rate electric energy meter of a kind of electronic type.
[background technology]
Though the existing various a lot of types of the existing single-phase multi-rate electric energy meter of electronic type, and came out to have a lot of years, but some problem still exists always, not can solve, such as the stability of long playing reliability, measuring accuracy and the life-span of using etc.
Overcome the above problems and need design more reliably on the line, device choose the stability that will more pay attention to device; Simultaneously,, like this also require the fine of control on the cost of design and whole production so the unit price of product is also pressed very lowly because to participate in the unit and the producer of the design of this serial ammeter and production more and more.But top in fact two kinds of situations are difficult to reach perfect unification, can only accomplish relative balance, thus never at all satisfactory Related product on the performance and on the cost.
[summary of the invention]
The purpose of this utility model solves the problems of the prior art exactly, proposes the single-phase multi-rate electric energy meter of a kind of electronic type, can improve measuring accuracy and long playing reliability, and cost is low.
For achieving the above object, the utility model proposes the single-phase multi-rate electric energy meter of a kind of electronic type, the single-chip microcomputer that comprises single-phase computation chip, band liquid crystal drive, single-phase computation chip is connected the input end of single-chip microcomputer, also be connected with impulse output circuit, LCD display circuit, storer, infrared communication circuit, RS485 circuit and clock chip on the single-chip microcomputer respectively, described single-phase computation chip adopts the ADE7755 chip.
As preferably, the input end of single-chip microcomputer also is connected with button inputting circuits and negative phase sequence testing circuit.
As preferably, described single-chip microcomputer adopts the P89LPC9401 chip.This chip operating voltage is that 3.3V and I/O mouth can bear the 5V level, so the processing of voltage is just suitable simple and reliable.
As preferably, described storer adopts EEPROM.
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, described clock chip adopts the RX8025 chip.Cost is low.
As preferably, also be connected with chip temperature on the described RX8025 chip.The price that the RX8025 chip adds chip temperature still has suitable advantage than the price of single DS3231, and the scheme of RX8025 can satisfy the technical requirement of single-phase table fully on clock accuracy.
The beneficial effects of the utility model: the utility model voltage, electric current is after sample circuit is taken a sample respectively, sending into single-phase computation chip handles, and be converted into digital signal and deliver to single-chip microcomputer and calculate, single-chip microcomputer is read the data of ADE7755 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 predefined period, 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 the high-precision measuring chip ADE7755 of AD company, 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 single-phase multi-rate electric energy meter of the utility model electronic type.
[embodiment]
Consult Fig. 1, the single-phase multi-rate electric energy meter of electronic type, the single-chip microcomputer 2 that comprises single-phase computation chip 1, band liquid crystal drive, single-phase computation chip 1 is connected the input end of single-chip microcomputer 2, also be connected with impulse output circuit 3, LCD display circuit 4, storer 5, infrared communication circuit 6, RS485 circuit 7 and clock chip 8 on the single-chip microcomputer 2 respectively, described single-phase computation chip 1 adopts the ADE7755 chip.The input end of described single-chip microcomputer 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 single-phase computation chip 1 and are handled after sample circuit is taken a sample respectively, and are converted into digital signal and deliver to single-chip microcomputer 2 and calculate.Owing to adopted special-purpose ADE7755 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.Single-chip microcomputer 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 predefined period, 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 single-chip microcomputer 2 adopts the P89LPC9401 chip.
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.Because single-phase many rates primary power partly has only metering section to need the 5V power supply, remainder all is the 3.3V power supply, and metering section only need be worked when external power source is arranged, so the processing of power supply also is suitable simple, promptly export the two-way power supply when external power source is arranged, a 5V and a 3.3V are connected to cell voltage the 3.3V end then, so just can guarantee when the 3.3V power supply all has electricity, and the 5V power supply only guarantees have when external power source is arranged.
The ADE7755 chip is a kind of pin-point accuracy electric energy measurement integrated circuit, and its technical indicator surpasses the accuracy requirement of IEC1036 regulation.ADE7755 only uses mimic channel in ADC and reference source, all other signal places (as multiplying each other and filtering) all use digital circuit, and this makes ADE7755 still can keep high accuracy and long-time stability under harsh environmental conditions.ADE7755 pin F1 and F2 be with lower frequency version active power of output mean value, can directly drive the electromechanical register or with microcontroller (MCU) interface.Pin CF is with upper frequency form active power of output instantaneous value, be used for verification or with the MCU interface.ADE7755 inside comprises a supervisory circuit to the AVDD power pins.Before AVDD rose to 4V, ADE7755 remained on reset mode always.When AVDD drops to below the 4V, ADE7755 also is reset, this moment F1, F2 and CF not have to export.Inner phase matching circuit mate the phase place of voltage and current passage all the time, no matter Hi-pass filter (HPL) in the passage 1 be connect or disconnection.Inner unloaded threshold property guarantees that ADE7755 does not have shunt running when zero load.ADE7755 has 24 pin DIP and two kinds of encapsulation of SSOP.Characteristics: pin-point accuracy, the accuracy requirement of support 50Hz/60Hz IEC 687/1036 standard, error is less than 0.1% in 500: 1 dynamic range; Active power mean value is exported in the frequency mode from ADE7755 pin F1 and F2; The active power instantaneous value is exported in the upper frequency mode from pin CF, can be used for instrument check; Logic output pin REVP can indicate negative power or wrong line; FI and F2 can directly drive electromechanical register and two-phase stepping motor; Programmable gain amplifier in the current channel (PGA) makes instrument can use the shunt resistance of little resistance; Under environment and time the condition that great changes have taken place, adopt patent analog to digital converter (ADC) and digital signal place (DSP) still to guarantee pin-point accuracy; Be provided with power supply supervisory circuit in the sheet; Have anti-shunt running function (unloaded threshold value) in the sheet; Sheet internal reference voltage 2.5V ± 8% (30ppm/ ℃ of temperature coefficient representative value) can provide benchmark for external circuit.
Described storer 5 adopts EEPROM.Adopt the 24LC64I chip.The 24LC64I chip is the Low-Power CMOS serial EEPROM of U.S. Microchip company, it is to include 8K x 8 (64K bit) storage space, have operating voltage wide (2.5～5.5V), the advantage of erasable (greater than 10000 times) often, writing speed fast (less than 5ms).1,2,3 pin of 24LC64I chip 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 24LC64I.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.The mountain is less in the emissive power of infrarede emitting diode, 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 single-chip microcomputer 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 Single Chip Microcomputer (SCM) system, between the asynchronous communication mouth of single-chip microcomputer 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 single-chip microcomputer 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.
Described clock chip 8 adopts the RX8025 chip, also is connected with chip temperature on the RX8025 chip.Single-phase many rate scales table is because of involving time-shared charge, must use external hardware clock clock chip, should not adopt software clock, software clock causes inaccurate clock when being interfered, by the software algorithm error correction, can cause certain error, example adopts technology of error correction in a minute, makes mistakes when needing error correction in interference, can cause one minute error.Adopt early stage employing of external clock to fly sharp Pu PCF8563, the outside 32.768KHZ crystal that adopts, the external clock crystal is strict on welding technology, can only adopt the backguy technology, otherwise can cause the crystal failure of oscillation, and clock stops walking.Two kinds of clock crystal built-in chips are arranged at present in the world, and a kind of is the DS3231 that U.S. DALLS company produces, and the said firm is the longest for producing clock chip history in the world, and technology is what a company, is good at manufacture control use clock chip especially.A kind of is the RX8025 that Japanese EPSON produces, and EPSON company mainly uses at clock field.The DS3231 chip is 3PPM for band auto thermal compensation chip at-40 ℃ ~+80 ℃ clock clocking errors, and a day error is 0.26 second every day, is 2PPM in nominal temperature, and a day error is 0.18 second every day.Produce in batches and can guarantee your office's requirement is day error at 0.2 second, can satisfy.The RX8025 that EPSON company produces, clock be ± 5PMM, and this day error is 0.4 second every day, and its precision can be adjusted, but step pitch is 3PPM, promptly is-0.5 second originally promptly 0.26 second every day, can be-0.24 second after adjustment.But its output pulse is inhomogeneous, must will amplify test period.Adopt the RX8025 outside also temperature sensor must be arranged, adopt the software mode mode to carry out temperature compensation, calculated once in general 10 minutes.Consider the requirement on cost factor and the concrete performance, the utility model selects for use RX8025 as clock chip.Because the price that RX8025 adds chip temperature still has suitable advantage than the price of single DS3231, and the scheme of RX8025 can satisfy the technical requirement of single-phase table fully on clock accuracy.
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 (8)
1. the single-phase multi-rate electric energy meter of electronic type, it is characterized in that: the single-chip microcomputer (2) that comprises single-phase computation chip (1), band liquid crystal drive, single-phase computation chip (1) is connected the input end of single-chip microcomputer (2), also be connected with impulse output circuit (3), LCD display circuit (4), storer (5), infrared communication circuit (6), RS485 circuit (7) and clock chip (8) on the single-chip microcomputer (2) respectively, described single-phase computation chip (1) adopts the ADE7755 chip.
2. the single-phase multi-rate electric energy meter of electronic type as claimed in claim 1 is characterized in that: the input end of described single-chip microcomputer (2) also is connected with button inputting circuits (9) and negative phase sequence testing circuit (10).
3. the single-phase multi-rate electric energy meter of electronic type as claimed in claim 1 is characterized in that: described single-chip microcomputer (2) adopts the P89LPC9401 chip.
4. the single-phase multi-rate electric energy meter of electronic type as claimed in claim 1 is characterized in that: described storer (5) adopts EEPROM.
5. the single-phase multi-rate electric energy meter of electronic type 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.
6. the single-phase multi-rate electric energy meter of electronic type as claimed in claim 1 is characterized in that: described RS485 circuit (7) adopts the MAX13485 chip.
7. as the single-phase multi-rate electric energy meter of any one described electronic type in the claim 1 to 6, it is characterized in that: described clock chip (8) adopts the RX8025 chip.
8. the single-phase multi-rate electric energy meter of electronic type as claimed in claim 7 is characterized in that: also be connected with chip temperature on the described RX8025 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201630037U CN201247272Y (en) | 2008-08-25 | 2008-08-25 | Electronic type single-phase multi-fee-rate electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201630037U CN201247272Y (en) | 2008-08-25 | 2008-08-25 | Electronic type single-phase multi-fee-rate electric energy meter |
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| Publication Number | Publication Date |
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| CN201247272Y true CN201247272Y (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201630037U Expired - Fee Related CN201247272Y (en) | 2008-08-25 | 2008-08-25 | Electronic type single-phase multi-fee-rate electric energy meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865949A (en) * | 2010-06-08 | 2010-10-20 | 深圳市科陆电子科技股份有限公司 | Direct-current electric energy meter and method for metering direct-current electric energy |
| CN102419386A (en) * | 2010-09-27 | 2012-04-18 | 宁夏隆基宁光仪表有限公司 | 0.5-grade electronic type single-phase watt-hour meter |
| CN111257608A (en) * | 2020-02-17 | 2020-06-09 | 浙江正泰仪器仪表有限责任公司 | Synchronous processing method of multi-core intelligent electric energy meter and multi-core intelligent electric energy meter |
-
2008
- 2008-08-25 CN CNU2008201630037U patent/CN201247272Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865949A (en) * | 2010-06-08 | 2010-10-20 | 深圳市科陆电子科技股份有限公司 | Direct-current electric energy meter and method for metering direct-current electric energy |
| CN101865949B (en) * | 2010-06-08 | 2012-09-05 | 深圳市科陆电子科技股份有限公司 | Direct-current electric energy meter and method for metering direct-current electric energy |
| CN102419386A (en) * | 2010-09-27 | 2012-04-18 | 宁夏隆基宁光仪表有限公司 | 0.5-grade electronic type single-phase watt-hour meter |
| CN111257608A (en) * | 2020-02-17 | 2020-06-09 | 浙江正泰仪器仪表有限责任公司 | Synchronous processing method of multi-core intelligent electric energy meter and multi-core intelligent electric energy meter |
| CN111257608B (en) * | 2020-02-17 | 2021-06-22 | 浙江正泰仪器仪表有限责任公司 | Synchronous processing method of multi-core intelligent electric energy meter and multi-core intelligent electric energy meter |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090527 Termination date: 20170825 |