CN201141892Y - Three-phase four-wire electronic split-phase measuring electric energy meter - Google Patents
Three-phase four-wire electronic split-phase measuring electric energy meter Download PDFInfo
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- CN201141892Y CN201141892Y CNU2007200429027U CN200720042902U CN201141892Y CN 201141892 Y CN201141892 Y CN 201141892Y CN U2007200429027 U CNU2007200429027 U CN U2007200429027U CN 200720042902 U CN200720042902 U CN 200720042902U CN 201141892 Y CN201141892 Y CN 201141892Y
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Abstract
The utility model relates to an electric power meter, in particular to a three-phase-four-line electronic electric power meter based on each phase. The electric power meter includes a current sampling unit, a voltage sampling unit and a LED display unit; and is characterized in that the three-phase-four-line electronic electric power meter based on each phase also includes three groups of signal sampling and processing channels and a CPU; the CPU includes memory and a communication interface; the output terminal of the signal sampling and processing channel is connected with the input of the CPU; the signal is displayed on the LED display unit after being processed by the CPU; the data is stored in the memory; and the remote communication is realized by the communication interface. In the structure, the total power of the positive and reserved phase of the three phases, the separated power for each phase of the positive and reserved phase, the time of the phase deficiency for each phase and the total time of phase deficiency can be measured and displayed by combining the signal sampling and processing channel with the CPU, and by combining the memory and the communication interface; meanwhile, the communication function greatly saves labor resource and cost.
Description
Technical field
The utility model relates to a kind of electric energy meter, especially a kind of three-phase and four-line electronic type phase-splitting metering electric energy meter.
Background technology
Employed in the market three phases electronic energy meter with reference to figure 1 as can be known, is made of electric current and voltage sample unit, special-purpose measuring IC, register, electrical energy pulse output indicator, test output terminal mouth, telemechanical pulse output and accessory power supply etc.; Tested three-phase voltage and three-phase current are transformed into appropriate signals through sampling unit circuit separately, be input to special-purpose measuring IC, through a series of computings, be converted to and the proportional frequency pulse signal of tested three phase power, through frequency division rear drive stepper motor register, thereby realize three-phase electric energy metering.
Above-mentioned three phases electronic energy meter, because on the structure and the restriction of measuring principle, total electric weight sum that can only show three-phase, can not measure the reverse electric weight of phase-splitting (each phase) electric weight and phase-splitting (each phase) thereof respectively, can not measure the phase shortage time, can not carry out telecommunication, function is also very single, and easily by stealing (current reversal stealing).
Summary of the invention
The purpose of this utility model is to provide a kind of can measure and show the total electric weight of forward of three-phase, oppositely total electric weight of three-phase, the phase-splitting electric weight of forward, reverse phase-splitting electric weight respectively, the phase shortage time that can show each phase, total phase shortage time has the three-phase and four-line electronic type phase-splitting metering electric energy meter that communication function again can be anti-electricity-theft.
The utility model is achieved by the following scheme: a kind of three-phase and four-line electronic type phase-splitting metering electric energy meter, comprise current sampling unit, the voltage sample unit, led display unit, it is characterized in that described three-phase and four-line electronic type phase-splitting metering electric energy meter also comprises three groups of signal sampling treatment channel and central processing unit, every group of signal sampling treatment channel comprises the single-phase current sampling unit, the single-phase voltage sampling unit, the current-differencing amplifying unit, electric current A/D converting unit, voltage difference amplifying unit, voltage A/D converting unit, the phase correction unit, high pass filter unit, multiplier, low-pass filter unit and numeral/frequency converter, central processing unit comprises storer and communication interface, the output terminal of single-phase current sampling unit is connected with the input end of current-differencing amplifying unit, the output terminal of current-differencing amplifying unit is connected with the input end of electric current A/D converting unit, the output terminal of electric current A/D converting unit is connected with the input end of phase correction unit, the output terminal of phase correction unit is connected with the input end of high pass filter unit, the output terminal of high pass filter unit is connected with the input end of multiplier, the output terminal of single-phase voltage sampling unit is connected with the input end of voltage difference amplifying unit, the output terminal of voltage difference amplifying unit is connected with the input end of voltage A/D converting unit, the output terminal of voltage A/D converting unit is connected with the input end of multiplier, the output terminal of multiplier is connected with the input end of low-pass filter unit, the output terminal of low-pass filter unit is connected with the input end of numeral/frequency converter, the output terminal of numeral/frequency converter is as the output terminal of signal sampling treatment channel, the output terminal of three groups of sampling processing passages is connected with the input end of central processing unit respectively, storer is connected with communication interface, the input end of led display unit is connected with the output terminal of central processing unit, the current signal that the sampling of single-phase current sampling unit obtains amplifies through difference in the signal sampling treatment channel successively, the A/D conversion, phase correction and high-pass filtering export multiplier to after handling, the voltage signal that the sampling of single-phase voltage sampling unit obtains amplifies through passing through difference successively in the signal sampling treatment channel, export multiplier to after the A/D conversion, and carry out multiplying by multiplier with current signal after handling, finish instantaneous power measurement, signal after multiplying each other exports numeral/frequency converter to through low-pass filtering, convert the frequency pulse signal to, high-frequency pulse signal exports central processing unit to, low frequency pulse signal is not handled, high-frequency pulse signal is handled through central processing unit and is exported led display unit to, and data storage is finished telecommunication to storer and by communication interface.This is provided with functions such as the difference amplification that utilizes the signal sampling treatment channel, A/D conversion, multiplier, the voltage and current signal that sampling unit obtains is handled, realized forward and the oppositely measurement of phase-splitting electric energy instantaneous power, and export central processing unit to, handle output by central processing unit, be presented on the LED display, and finish remote communicating function by communication interface.
Of the present utility model being further designed to: three road electric energy metricals are finished by three ADE7755 electric energy metrical IC, because single-phase electric energy computation chip ADE7755 itself has anti-stealing electricity function, and have difference amplification, A/D conversion, phase correction, multiplier, phase correction, high-pass filtering, low-pass filtering, a numeral/frequency translation function, do not need to be provided with again other combination of circuits, the three-phase kilowatt-hour meter that this kind of computation chip is formed, simple in structure, realized the three-phase kilowatt-hour meter anti-stealing electricity function simultaneously, phase-splitting electric energy metrical function, the reverse power function of measuring.
Of the present utility modelly further be set to: described communication interface is made of infrared interface and RS485 interface.This is provided with communication interface is divided into infrared interface and RS485 interface, not only can remote meter reading but also can carry out data transmission with computer networking, finish functions such as automatic data logging, and easy for operation.
Of the present utility modelly further be set to: current sampling unit realizes that by current transformer the voltage sample unit is realized by resistance pressure-dividing network.This is provided with and adopts simple and reliable sampling unit mode, has reduced cost.
Above-mentioned three-phase and four-line electronic type phase-splitting metering electric energy meter, utilize the storer of electric energy computation chip ADE7755 and central processing unit and cooperating of communication interface, to the phase-splitting electric weight of oppositely total electric weight of the total electric weight of the forward of three-phase, three-phase, forward, reverse phase-splitting electric weight, phase shortage time of each phase, total phase shortage time measures and show, have communication function and function again simultaneously, simple in structure, easy to operate practical again, and saved human resources and expense greatly.
Description of drawings
Fig. 1 is the circuit block diagram of background technology;
Fig. 2 is the circuit block diagram of present embodiment;
Fig. 3 is the circuit block diagram of signal sampling treatment channel in the present embodiment;
Fig. 4 a-Fig. 4 c is respectively the physical circuit figure of a in the present embodiment, b, c three-phase signal sampling processing passage;
Embodiment
With reference to figure 2, Fig. 3 as can be known, voltage sample unit and current sampling unit, respectively voltage signal and current signal are sampled, the current signal that sampling unit obtains amplifies through difference in the signal sampling treatment channel, the A/D conversion, phase correction and high-pass filtering are handled, the voltage signal that sampling unit obtains amplifies through difference in the signal sampling treatment channel, after the A/D conversion, carry out multiplying with the current signal after handling by multiplier circuit, finish instantaneous power measurement, signal after multiplying each other exports numeral/frequency converter to through low-pass filtering, convert the frequency pulse signal to, high-frequency pulse signal exports central processing unit to, low frequency pulse signal is not handled, high-frequency pulse signal is after central processing unit is handled, be converted to electric energy, delivering to led display unit shows, the forward of phase-splitting forward and reverse power and three-phase and reverse total electric energy also can be calculated by central processing unit, and on light-emitting diode display, show, computational data stores in the storer, carries out telecommunication by communication interface.Because three phase splitters are separate, principle is identical.The electric energy metrical principle is as follows, is example with one tunnel phase-splitting metering treatment circuit.
Each phase power supply is through step-down and rectification, and dividing potential drop is delivered to voltage comparator circuit separately again, produces the default phase signal of each phase, and gives the central processing unit detecting unit, carries out the phase shortage time keeping, carries out the phase shortage indication with luminotron simultaneously.
The data that central processing unit obtains metering by RS485 or infrared communication interface circuit and computer networking, are delivered to the electric energy management center, realize the automatic copy reading of electric weight, and management work, simplified the trouble that artificial timing meter reading is collected the electricity charge, saved human resources and expense.
With reference to figure 3 as can be known, inductance L 11, inductance L 12, resistance R 101, resistance R 102, resistance R 103, resistance R 104, resistance R 105, resistance R 106, resistance R 107, resistance R 108, resistance R 113, capacitor C 101, capacitor C 102, capacitor C 105, capacitor C 106 connects and composes the current sampling unit circuit, resistance R 109, resistance R 110, resistance R 111, resistance R 112, resistance R 114, resistance R 115, resistance R 116, resistance R 118, resistance R 119, resistance R 120, resistance R 121, resistance R 122, resistance R 123, resistance R 124, resistance R 125, resistance R 126, resistance R 127, resistance R 129, capacitor C 103, capacitor C 104, capacitor C 107, capacitor C 108 connects and composes the voltage sample element circuit of resistance pressure-dividing network formula, the instantaneous active power pulse signal output end CF of ADE7755 electric energy computation chip is connected with resistance R 128, the other end of resistance R 128 is as the pulse output end of phase-splitting, quartz crystal X1, capacitor C 110, capacitor C 111 series connection constitute the time clock source circuit, two output terminals are connected with the CLKOUT pin with the CLKIN pin of ADE7755 electric energy computation chip respectively, the G0 pin of ADE7755 electric energy computation chip and G1 pin ground connection, resistance R 117 1 ends are connected with power vd D, the other end is connected with the S1 pin with the S0 pin of ADE7755 electric energy computation chip respectively, resistance R 331, light lotus root SA, resistance R 442, resistance R 408 connects, input end FA is connected with the REVP pin of ADE7755 electric energy computation chip, and light lotus root SA is as the reverse power pilot lamp.
Product signal sampling processing passage can be by independently difference amplification in the utility model, the A/D conversion, phase correction, multiplier, phase correction, high-pass filtering, low-pass filtering, numeral/frequency inverted and auxiliary circuit constitute, can use the AD7755 electric energy computation chip, because the ADE7755 electric energy computation chip is a kind of dedicated IC chip that is used for power measurement and electric energy calculating, it can directly link to each other with the sensor of different journey amounts, thereby reach the simplification Interface design, and improve power measurement degree of accuracy and stable purpose, so the preferred AD7755 electric energy computation chip of present embodiment.
Each pin of ADE7755 electric energy computation chip is described below:
● IP, IN: analog input channel 1, be used for the current signal input, maximum differential input signal is ± 470mV that this passage has the input excess voltage protection simultaneously;
● VP, VN: analog input channel 2, be used for the voltage signal input, maximum differential input signal is ± 660mV that this road has the input excess voltage protection simultaneously;
● F1, F2: low frequency logic pulse signal output port can be used to provide average active power information;
● CF: the instantaneous active power pulse signal output end, this output signal also can be used for calibrating indicating instrument;
● S1, S0: logical signal is imported, and is used to select the frequency range of numeral/frequency converter output pulse signal;
● G1, G0: the logic signal input end mouth can be used for selecting the amplifier gain of input channel 1;
● CLKIN: the external clock input also can come to provide clock source for chip by connect quartz crystal between CLKIN pin and CLKOUT pin;
● when CLKOUT:CLKIN was the external clock input, this pin can drive 1 CMOS load;
● SCF: the logic signal input end mouth can be used for selecting calibration frequency;
● REF: the output of sheet internal reference voltage, as adopting external reference voltage, also pin input thus;
● REVF: the logical signal output port, when chip detection is leading to power factor, this pin output high level, but do not latch, promptly, device resets when power lags behind when detecting;
Claims (5)
1. three-phase and four-line electronic type phase-splitting metering electric energy meter, comprise current sampling unit, the voltage sample unit, led display unit, it is characterized in that described three-phase and four-line electronic type phase-splitting metering electric energy meter also comprises three groups of signal sampling treatment channel and central processing unit, every group of signal sampling treatment channel comprises the single-phase current sampling unit, the single-phase voltage sampling unit, the current-differencing amplifying unit, electric current A/D converting unit, voltage difference amplifying unit, voltage A/D converting unit, the phase correction unit, high pass filter unit, multiplier, low-pass filter unit and numeral/frequency converter, central processing unit comprises storer and communication interface, the output terminal of single-phase current sampling unit is connected with the input end of current-differencing amplifying unit, the output terminal of current-differencing amplifying unit is connected with the input end of electric current A/D converting unit, the output terminal of electric current A/D converting unit is connected with the input end of phase correction unit, the output terminal of phase correction unit is connected with the input end of high pass filter unit, the output terminal of high pass filter unit is connected with the input end of multiplier, the output terminal of single-phase voltage sampling unit is connected with the input end of voltage difference amplifying unit, the output terminal of voltage difference amplifying unit is connected with the input end of voltage A/D converting unit, the output terminal of voltage A/D converting unit is connected with the input end of multiplier, the output terminal of multiplier is connected with the input end of low-pass filter unit, the output terminal of low-pass filter unit is connected with the input end of numeral/frequency converter, the output terminal of numeral/frequency converter is as the output terminal of signal sampling treatment channel, the output terminal of three groups of sampling processing passages is connected with the input end of central processing unit respectively, storer is connected with communication interface, the input end of led display unit is connected with the output terminal of central processing unit, the current signal that the sampling of single-phase current sampling unit obtains amplifies through difference in the signal sampling treatment channel successively, the A/D conversion, phase correction and high-pass filtering export multiplier to after handling, the voltage signal that the sampling of single-phase voltage sampling unit obtains amplifies through passing through difference successively in the signal sampling treatment channel, export multiplier to after the A/D conversion, and carry out multiplying by multiplier with current signal after handling, finish instantaneous power measurement, signal after multiplying each other exports numeral/frequency converter to through low-pass filtering, convert the frequency pulse signal to, high-frequency pulse signal exports central processing unit to, low frequency pulse signal is not handled, high-frequency pulse signal is handled through central processing unit and is exported led display unit to, and data storage is finished telecommunication to storer and by communication interface.
2. according to the described three-phase and four-line electronic type of claim 1 phase-splitting metering electric energy meter, it is characterized in that finishing difference amplification, A/D conversion, phase correction, high-pass filtering, multiplier, low-pass filtering and numeral/frequency converter function by the ADE7755 electric energy computation chip in the signal sampling treatment channel.
3. according to claim 1 or 2 described three-phase and four-line electronic type phase-splitting metering electric energy meters, it is characterized in that described communication interface is made of infrared interface and RS485 interface.
4. according to claim 1 or 2 described three-phase and four-line electronic type phase-splitting metering electric energy meters, it is characterized in that current sampling unit carries out sampling unit by current transformer, the voltage sample unit carries out sampling unit by resistance pressure-dividing network.
5. according to the described three-phase and four-line electronic type of claim 3 phase-splitting metering electric energy meter, it is characterized in that current sampling unit carries out sampling unit by current transformer, the voltage sample unit carries out sampling unit by resistance pressure-dividing network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200429027U CN201141892Y (en) | 2007-08-16 | 2007-08-16 | Three-phase four-wire electronic split-phase measuring electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007200429027U CN201141892Y (en) | 2007-08-16 | 2007-08-16 | Three-phase four-wire electronic split-phase measuring electric energy meter |
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| CN201141892Y true CN201141892Y (en) | 2008-10-29 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101458277B (en) * | 2009-01-13 | 2011-02-09 | 中国计量科学研究院 | Three phase electric energy measurement apparatus |
| CN102158220A (en) * | 2010-12-06 | 2011-08-17 | 广东雅达电子股份有限公司 | Method for calculating power by using electric energy pulses |
| CN102621380A (en) * | 2012-03-14 | 2012-08-01 | 武汉长光科技有限公司 | Centralized intelligent electric meter |
| CN103389396A (en) * | 2013-07-09 | 2013-11-13 | 华立仪表集团股份有限公司 | Single-phase register ammeter with far infrared communication function and registering method thereof |
| CN103424617A (en) * | 2013-05-13 | 2013-12-04 | 万高(杭州)科技有限公司 | Single-phase electric energy metering system |
| CN103513101A (en) * | 2012-06-27 | 2014-01-15 | 苏州工业园区新宏博通讯科技有限公司 | Method for collecting phase-splitting power parameters of three-phase power |
| CN105092965A (en) * | 2015-09-01 | 2015-11-25 | 银川蓝擎网络信息技术股份有限公司 | Voltage-controlled oscillator-based power metering method and power metering circuit |
| CN105405266A (en) * | 2015-10-27 | 2016-03-16 | 国网浙江省电力公司丽水供电公司 | Distribution network terminal data wireless relay acquisition apparatus |
| CN107202919A (en) * | 2016-10-28 | 2017-09-26 | 北京京仪北方仪器仪表有限公司 | Intelligent electric energy meter with communication interface |
| CN109581273A (en) * | 2019-01-24 | 2019-04-05 | 国网山东省电力公司日照供电公司 | A kind of system and method that quick examination electricity meter inlet-outlet line is reversed |
| CN110858441A (en) * | 2018-08-23 | 2020-03-03 | 杭州明特科技有限公司 | Electric energy rapid reporting system/method, electric energy meter and medium |
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2007
- 2007-08-16 CN CNU2007200429027U patent/CN201141892Y/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101458277B (en) * | 2009-01-13 | 2011-02-09 | 中国计量科学研究院 | Three phase electric energy measurement apparatus |
| US8823359B2 (en) | 2009-01-13 | 2014-09-02 | National Institute Of Metrology P.R. China | Three-phase electric energy measurement apparatus |
| CN102158220A (en) * | 2010-12-06 | 2011-08-17 | 广东雅达电子股份有限公司 | Method for calculating power by using electric energy pulses |
| CN102158220B (en) * | 2010-12-06 | 2015-09-09 | 广东雅达电子股份有限公司 | A kind of method of electrical energy pulse rated output |
| CN102621380B (en) * | 2012-03-14 | 2015-03-04 | 武汉长光科技有限公司 | Centralized intelligent electric meter |
| CN102621380A (en) * | 2012-03-14 | 2012-08-01 | 武汉长光科技有限公司 | Centralized intelligent electric meter |
| CN103513101A (en) * | 2012-06-27 | 2014-01-15 | 苏州工业园区新宏博通讯科技有限公司 | Method for collecting phase-splitting power parameters of three-phase power |
| CN103424617A (en) * | 2013-05-13 | 2013-12-04 | 万高(杭州)科技有限公司 | Single-phase electric energy metering system |
| CN103424617B (en) * | 2013-05-13 | 2016-03-23 | 万高(杭州)科技有限公司 | Single-phase electric energy metering system |
| CN103389396A (en) * | 2013-07-09 | 2013-11-13 | 华立仪表集团股份有限公司 | Single-phase register ammeter with far infrared communication function and registering method thereof |
| CN103389396B (en) * | 2013-07-09 | 2016-04-13 | 华立科技股份有限公司 | A kind of single-phase register ammeter and metering method thereof with Far-infrared communication function |
| CN105092965A (en) * | 2015-09-01 | 2015-11-25 | 银川蓝擎网络信息技术股份有限公司 | Voltage-controlled oscillator-based power metering method and power metering circuit |
| CN105405266A (en) * | 2015-10-27 | 2016-03-16 | 国网浙江省电力公司丽水供电公司 | Distribution network terminal data wireless relay acquisition apparatus |
| CN107202919A (en) * | 2016-10-28 | 2017-09-26 | 北京京仪北方仪器仪表有限公司 | Intelligent electric energy meter with communication interface |
| CN107202919B (en) * | 2016-10-28 | 2019-12-13 | 北京京仪北方仪器仪表有限公司 | Intelligent electric energy meter with communication interface |
| CN110858441A (en) * | 2018-08-23 | 2020-03-03 | 杭州明特科技有限公司 | Electric energy rapid reporting system/method, electric energy meter and medium |
| CN109581273A (en) * | 2019-01-24 | 2019-04-05 | 国网山东省电力公司日照供电公司 | A kind of system and method that quick examination electricity meter inlet-outlet line is reversed |
| CN109581273B (en) * | 2019-01-24 | 2021-04-16 | 国网山东省电力公司日照供电公司 | System and method for rapidly checking reverse connection of inlet and outlet wires of electric quantity meter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20090916 |