CN102928659A - High-precision power measuring circuit - Google Patents
High-precision power measuring circuit Download PDFInfo
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- CN102928659A CN102928659A CN2012104386257A CN201210438625A CN102928659A CN 102928659 A CN102928659 A CN 102928659A CN 2012104386257 A CN2012104386257 A CN 2012104386257A CN 201210438625 A CN201210438625 A CN 201210438625A CN 102928659 A CN102928659 A CN 102928659A
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- circuit
- measurement
- precision power
- measuring circuit
- data processing
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Abstract
The invention discloses a high-precision power measuring circuit which comprises a voltage measuring circuit, a current measuring circuit, a measurement data processing circuit and a display unit. The high-precision power measuring circuit eliminates linear error, input offset voltage and phase displacement of a device in a power measuring process, is simple and practicable, and meets requirements of high-precision power detection.
Description
Technical field
The invention belongs to the online detection field of plant equipment, relate in particular to a kind of high-precision power metering circuit.
Background technology
The error of power measurement is mainly derived from linear error, input offset voltage and three aspects of phase shift of device.Linear error refers to because the error that amplifier and the not high signal transmission distortion that causes of the A/D device linearity produce.Defeated people's offset voltage is the offset voltage of amplifier output terminal when being input as zero and the ratio of the hot-tempered acoustic gain of circuit, and its size is relevant with employed amplifier device.Phase shift between voltage, electric current mainly causes by frequency measurement error, sample-synchronous error and I/V conversion, circuit distribution parameter etc., and is therefore requisite during a kind of high-precision power-measuring circuit.
Summary of the invention
The object of the present invention is to provide a kind of high-precision power metering circuit.
The technical scheme that realizes above-mentioned purpose is: a kind of high-precision power metering circuit, it is characterized in that, comprise tension measuring circuit, current measurement circuit, Measurement and Data Processing circuit and display unit, wherein, described Measurement and Data Processing circuit is connected with described tension measuring circuit, described current measurement circuit and described display unit respectively.
Above-mentioned high-precision power metering circuit, wherein, described tension measuring circuit is measured the input voltage value Vin of circuit-under-test.
Above-mentioned high-precision power metering circuit, wherein, described current measurement circuit is measured the input current value Iin of circuit-under-test.
Above-mentioned high-precision power metering circuit, wherein, described Measurement and Data Processing circuit is according to magnitude of voltage Vin and the current value I in computation and measurement power of measuring gained.
Above-mentioned high-precision power metering circuit, wherein, described display unit shows the measurement power that calculates gained.
Effect of the present invention is: the present invention is by linear error, input offset voltage and the phase shift of device in a kind of circuit for eliminating power measurement process, and simple possible satisfies high-precision power and measures requirement.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1, provided embodiments of the present invention among the figure, in the present embodiment, it is that build on the basis that tension measuring circuit 100 adopts LM324, it is that build on the basis that current measurement circuit 200 adopts LM3245, and Measurement and Data Processing circuit 300 adopts S2C6410, and display unit 400 adopts 7 cun LCD.
The Vin=5v*sin (100 π t) that tension measuring circuit 100 is surveyed, the Iin=5A*sin (100 π t) that current measurement circuit 200 is surveyed passes to Measurement and Data Processing circuit 300.Measurement and Data Processing circuit 300 calculates the effective value of the Vin that surveys first, obtains Vout, and the effective value with the Iin that surveys calculates again, obtains Iout, computation and measurement power P=Vout*Iout=25W.Display unit 400 shows that the result of power measurement is 25W.
Principle of the present invention is: utilize to measure the waveform of the voltage and current of gained, and the effective value of calculating voltage and electric current respectively, both multiply each other the data of gained as the performance number that records.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not consist of limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (5)
1. high-precision power metering circuit, it is characterized in that, comprise tension measuring circuit, current measurement circuit, Measurement and Data Processing circuit and display unit, wherein, described Measurement and Data Processing circuit is connected with described tension measuring circuit, described current measurement circuit and described display unit respectively.
2. described high-precision power metering circuit according to claim 1 is characterized in that, described tension measuring circuit is measured the input voltage value Vin of circuit-under-test.
3. described high-precision power metering circuit according to claim 1 is characterized in that, described current measurement circuit is measured the input current value Iin of circuit-under-test.
4. described high-precision power metering circuit according to claim 1 is characterized in that, described Measurement and Data Processing circuit is according to magnitude of voltage Vin and the current value I in computation and measurement power of measuring gained.
5. described high-precision power metering circuit according to claim 1 is characterized in that, described display unit shows the measurement power that calculates gained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104386257A CN102928659A (en) | 2012-11-06 | 2012-11-06 | High-precision power measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104386257A CN102928659A (en) | 2012-11-06 | 2012-11-06 | High-precision power measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102928659A true CN102928659A (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104386257A Pending CN102928659A (en) | 2012-11-06 | 2012-11-06 | High-precision power measuring circuit |
Country Status (1)
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| CN (1) | CN102928659A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235175A (en) * | 2013-03-27 | 2013-08-07 | 四川和芯微电子股份有限公司 | Power consumption detecting circuit |
Citations (9)
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|---|---|---|---|---|
| US6377037B1 (en) * | 1996-08-01 | 2002-04-23 | Siemens Power Transmission And Distribution, Inc. | Watt-hour meter with digital per-phase power factor compensation |
| JP2003315388A (en) * | 2002-04-18 | 2003-11-06 | Matsushita Electric Works Ltd | Phase adjusting device and power measuring device using the same |
| CN201122172Y (en) * | 2008-04-30 | 2008-09-24 | 彭黎迎 | Electric energy meter capable of measuring electric energy measurement error |
| CN101441593A (en) * | 2007-11-23 | 2009-05-27 | 英业达股份有限公司 | Power measuring device |
| CN201352235Y (en) * | 2009-05-18 | 2009-11-25 | 深圳市森晖电子有限公司 | Three-phase multifunctional electric energy meter |
| CN201374017Y (en) * | 2009-02-24 | 2009-12-30 | 广东洛贝电子科技有限公司 | Control circuit for household appliance capable of inquiring electric quantity and voltage in real time |
| CN201740812U (en) * | 2010-08-03 | 2011-02-09 | 江西八达电子有限公司 | Power measuring circuit in multi-functional check meter |
| CN201754291U (en) * | 2010-07-29 | 2011-03-02 | 郑州新开普电子股份有限公司 | Sing-phase electronic prepayment dual-control electric energy meter |
| JP5042396B2 (en) * | 2010-11-02 | 2012-10-03 | 三菱電機株式会社 | Power supply and controller |
-
2012
- 2012-11-06 CN CN2012104386257A patent/CN102928659A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6377037B1 (en) * | 1996-08-01 | 2002-04-23 | Siemens Power Transmission And Distribution, Inc. | Watt-hour meter with digital per-phase power factor compensation |
| JP2003315388A (en) * | 2002-04-18 | 2003-11-06 | Matsushita Electric Works Ltd | Phase adjusting device and power measuring device using the same |
| CN101441593A (en) * | 2007-11-23 | 2009-05-27 | 英业达股份有限公司 | Power measuring device |
| CN201122172Y (en) * | 2008-04-30 | 2008-09-24 | 彭黎迎 | Electric energy meter capable of measuring electric energy measurement error |
| CN201374017Y (en) * | 2009-02-24 | 2009-12-30 | 广东洛贝电子科技有限公司 | Control circuit for household appliance capable of inquiring electric quantity and voltage in real time |
| CN201352235Y (en) * | 2009-05-18 | 2009-11-25 | 深圳市森晖电子有限公司 | Three-phase multifunctional electric energy meter |
| CN201754291U (en) * | 2010-07-29 | 2011-03-02 | 郑州新开普电子股份有限公司 | Sing-phase electronic prepayment dual-control electric energy meter |
| CN201740812U (en) * | 2010-08-03 | 2011-02-09 | 江西八达电子有限公司 | Power measuring circuit in multi-functional check meter |
| JP5042396B2 (en) * | 2010-11-02 | 2012-10-03 | 三菱電機株式会社 | Power supply and controller |
Non-Patent Citations (1)
| Title |
|---|
| 杨书杰: "浅谈集成运放在电功率测量方面的应用", 《科技资讯》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235175A (en) * | 2013-03-27 | 2013-08-07 | 四川和芯微电子股份有限公司 | Power consumption detecting circuit |
| CN103235175B (en) * | 2013-03-27 | 2016-01-06 | 四川和芯微电子股份有限公司 | Power consumption detection circuit |
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Application publication date: 20130213 |