CN101241146A - Automatic range volt-ampere phase meter - Google Patents
Automatic range volt-ampere phase meter Download PDFInfo
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- CN101241146A CN101241146A CNA2007100187130A CN200710018713A CN101241146A CN 101241146 A CN101241146 A CN 101241146A CN A2007100187130 A CNA2007100187130 A CN A2007100187130A CN 200710018713 A CN200710018713 A CN 200710018713A CN 101241146 A CN101241146 A CN 101241146A
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- microcontroller
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- programmable gain
- gain amplifier
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Abstract
The present invention relates to an electrotechnical measuring instrument. Volt-ampere phase meter has capacity of automatic measurement range which comprise of input choice switch, I/V converter, operational amplifier, programmable gain amplifier, A/D converter, micro controller and LCD screen, wherein, programmable gain amplifier and A/D converter are integrated in micro controller or independent outside of micro controller, programmable gain amplifier is controlled by automatic measurement range software module. The present invention has simple structure and convenient operation, the problem of manual shifting of traditional measuring instrument is resolved preferably.
Description
Technical field
The present invention relates to a kind of electric instrument, specifically two pincers type volt-ampere phase meters of electrical quantitys such as measuring voltage, electric current, phase place.
Background technology
Volt-ampere phase meter such as two pincers such as at present comparatively common SMG2000, ML12 etc. is relay protection worker, calibration worker and circuit upfitter's a universal measurement instrument.The primary structure of this instrument mainly is made up of input selector switch J, divider resistance, operational amplifier, A/D converter, microcontroller and liquid crystal display as shown in Figure 1.Because the gain of operational amplifier is fixed in this circuit, can not regulate automatically, so this circuit can only be realized the range conversion in the mode of regulating the divider resistance size by changing the gear of switch J.That is, when with the electric current of this instrument measurement electric system, voltage, need to adopt manual mode, determine to select the measurement range of signal earlier, during as the measurement electric current, need set measurement range: 200mA or 2A, 10A etc. in advance, satisfy the measuring accuracy requirement, measure then.So the traditional measurement instrument exists the loaded down with trivial details shortcoming of operation.
Summary of the invention
The objective of the invention is to improve the deficiency that conventional instrument exists, a kind of volt-ampere phase meter of automatic range of simple operation is provided.
The present invention is achieved in that mainly containing input selector switch, I/V converter, operational amplifier, programmable gain amplifier, A/D converter, microcontroller and LCD liquid crystal display constitutes.Karyonide is controlled the automatic range software module of this programmable gain amplifier in the microcontroller.Because the microcontroller model difference of selecting, programmable gain amplifier and A/D converter can be independent of the microcontroller outside, also can be integrated in microcontroller inside.Input selector switch is used for selecting the semaphore of measuring; The I/V converter is used for the current signal of mutual inductor output is converted into voltage signal; Operational amplifier is used for improving the gain of amplification channel; Programmable gain amplifier, A/D converter and microcontroller constitute signal adjustment circuit, are responsible for automatic range and regulate and signals collecting; Microcontroller also is used for image data, and after converting authentic and valid value to, shows by liquid crystal display.
The range of automatic range is divided: the measurement range of measuring-signal is divided into several little measurement ranges promptly divides range, again according to the performance index of A/D converter, determine to satisfy under each range the gain requirement of measuring accuracy.
Principle of work of the present invention is: signal enters the automatic range regulating circuit through switch J, and microcontroller is determined input signal place range by the gain setting value of A/D sampled value and programmable-gain operational amplifier; Microcontroller is reset adjustable gain Amplifier Gain value according to the range of determining again, satisfies the gain requirement under this range; Microcontroller carries out A/D sampling again then, and gain is provided with and sampled value calculates the authentic and valid value of input signal according to range, shows by liquid crystal display.
The present invention is simple in structure, easy to operate.Not only solved the problem of hand shift, can also as required range arbitrarily have been divided, reduced, saved cost the performance demands of operational amplifier own.
Description of drawings
The two pincers of Fig. 1 .SMG2000 volt-ampere phase meter circuit theory synoptic diagram;
Fig. 2. electrical block diagram of the present invention;
Fig. 3. the schematic flow sheet of the automatic range of microcontroller.
Embodiment
Below in conjunction with embodiments of the invention of accompanying drawing narration.
Fig. 2 has shown the circuit structure of present embodiment: mainly be made of input selector switch J, I/V converter, operational amplifier, the microcontroller that contains programmable gain amplifier and A/D converter, liquid crystal display.I/V converter and operational amplifier adopt the OPA2277 operational amplifier, and microcontroller is selected the C8051F series monolithic for use.Power supply is divided into VCC, AGND, three kinds of voltages of GND, and VCC is 3.3V, is used as the power supply of microcontroller and mimic channel; AGND is 1.5V, is used as the reference mid-point voltage of mimic channel; GND is 0V, is used as the ground wire of microcontroller and mimic channel.
The input stage that input selector switch J, I/V converter constitute signal realizes the input of signal.The programmable gain amplifier of operational amplifier and microcontroller inside, A/D converter, kernel constitute automatic gain and adjust circuit, are used for processing signals.The kernel of microcontroller and A/D converter composition data are gathered, are handled, and are responsible for calculating the result.
The automatic range of present embodiment is realized: be made up of control program and hardware two parts, wherein control program is present in the microcontroller kernel, and hardware components contains following parts.
1. operational amplifier is used for compensating the gain deficiency of programmable gain amplifier.
2. the programmable gain amplifier of microcontroller inside is used for adjusting signal gain according to the present range of signal.
3. the A/D converter of microcontroller inside is used for gathering through adjusted signal.
4. the microcontroller kernel is finished the gain of control A/D sampling, the calculating present range of current input signal and control programmable gain amplifier by the program of inside.
The measurement range of setting the current range of present embodiment is 0～10A, and it is divided into 0～100mA, 100mA～1A, three ranges of 1A～10A.When measuring electric current,, enter automatic gain through switch J then and adjust circuit by the current clamp sensor current signal.Behind signal process operational amplifier, the programmable gain amplifier, the effective value of nuclear control A/D sampling in the microcontroller, calculating picked up signal; Judge the range at signal place then by microcontroller, and reset the gain of the programmable gain amplifier of microcontroller inside according to the range of judging.When gain be provided with correct after, again by microcontroller by the A/D sampling, calculate the authentic and valid value of measured signal, show by liquid crystal display.Thereby realize the surveying work of automatic range.
Fig. 3 is the automatic range process flow diagram of the present invention's microcontroller, and process is as follows:
1. microprocessor controls A/D samples to adjusted signal;
2. use root mean square method, the effective value of calculating sampling value picked up signal;
3. according to the gain setting of current programmable gain amplifier and the conversion proportion of mutual inductor, calculate the authentic and valid value of input signal;
4. according to the range ability of dividing in advance, calculate the range at input signal place;
5. judge whether the range that this range that calculates and last computation go out is identical;
(1) if identical, illustrate that this sampling is to carry out under correct gain, the authentic and valid value of the signal that the 3rd step calculated is correct.Send liquid crystal display to show effective value.Returned for the 1st step, carry out new range once and regulate.
(2) if different, illustrate that this sampling carries out under incorrect gain, there is error in the authentic and valid value of the signal that the 3rd step calculated, and the result can not satisfy accuracy requirement.So need reset the gain of programmable gain amplifier.Returned for the 1st step, carry out new range once and regulate.
Claims (2)
1. the volt-ampere phase meter of an automatic range, input selector switch J, operational amplifier, A/D converter, microcontroller and liquid crystal display are arranged, it is characterized in that: be connected with the I/V converter between input selector switch J and operational amplifier, the interior karyonide of microcontroller is controlled the automatic range software module of this programmable gain amplifier.
2. the volt-ampere phase meter of a kind of automatic range according to claim 1 is characterized in that: it is inner or be independent of the microcontroller outside that programmable gain amplifier and A/D converter are integrated in microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100187130A CN101241146A (en) | 2007-09-20 | 2007-09-20 | Automatic range volt-ampere phase meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100187130A CN101241146A (en) | 2007-09-20 | 2007-09-20 | Automatic range volt-ampere phase meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101241146A true CN101241146A (en) | 2008-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100187130A Pending CN101241146A (en) | 2007-09-20 | 2007-09-20 | Automatic range volt-ampere phase meter |
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| Country | Link |
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| CN (1) | CN101241146A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012087866A1 (en) * | 2010-12-20 | 2012-06-28 | Dyno Nobel Inc. | Detonator ignition protection and detection circuit |
| CN102539867A (en) * | 2012-02-09 | 2012-07-04 | 郑州万特电气有限公司 | Intelligent phase voltammeter and measurement method thereof |
| CN103226157A (en) * | 2013-04-02 | 2013-07-31 | 国家电网公司 | Multi-gear jaw device for clamp-type volt-ampere phase meter |
| CN104865436A (en) * | 2015-04-23 | 2015-08-26 | 西安爱生技术集团公司 | Self-adaptive multi-gear unmanned plane airborne current measurer with program control interface |
| CN106226579A (en) * | 2016-07-26 | 2016-12-14 | 佛山敏石芯片有限公司 | It is automatically adjusted the current-to-voltage converting circuit of range |
| CN111537774A (en) * | 2020-06-05 | 2020-08-14 | 镇江英创电力电子有限公司 | Multi-range high-precision high-voltage isolation transmitter and calibration method |
| CN113098442A (en) * | 2021-03-30 | 2021-07-09 | 青岛汉泰电子有限公司 | Four-channel oscilloscope and bandwidth and offset adjusting circuit |
| CN113406467A (en) * | 2021-06-01 | 2021-09-17 | 长江存储科技有限责任公司 | Auxiliary measuring circuit, measuring circuit and semiconductor device electric signal measuring method |
| CN115575688A (en) * | 2022-09-29 | 2023-01-06 | 北京航天计量测试技术研究所 | Weak current detection circuit |
| CN115629235A (en) * | 2022-10-25 | 2023-01-20 | 广西电网有限责任公司钦州供电局 | Power data monitoring system and method based on intelligent phase voltammeter |
-
2007
- 2007-09-20 CN CNA2007100187130A patent/CN101241146A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9243877B2 (en) | 2010-12-20 | 2016-01-26 | Dyno Nobel Inc. | Detonator ignition protection and detection circuit |
| WO2012087866A1 (en) * | 2010-12-20 | 2012-06-28 | Dyno Nobel Inc. | Detonator ignition protection and detection circuit |
| CN102539867A (en) * | 2012-02-09 | 2012-07-04 | 郑州万特电气有限公司 | Intelligent phase voltammeter and measurement method thereof |
| CN102539867B (en) * | 2012-02-09 | 2015-07-29 | 郑州万特电气有限公司 | Smart phase volt ampere meter and measuring method thereof |
| CN103226157A (en) * | 2013-04-02 | 2013-07-31 | 国家电网公司 | Multi-gear jaw device for clamp-type volt-ampere phase meter |
| CN104865436B (en) * | 2015-04-23 | 2017-10-03 | 西安爱生技术集团公司 | A kind of adaptive many gear unmanned aerial vehicle onboard current measurers with programmable interface |
| CN104865436A (en) * | 2015-04-23 | 2015-08-26 | 西安爱生技术集团公司 | Self-adaptive multi-gear unmanned plane airborne current measurer with program control interface |
| CN106226579B (en) * | 2016-07-26 | 2019-04-02 | 佛山敏石芯片有限公司 | Automatically adjust the current-to-voltage converting circuit of range |
| CN106226579A (en) * | 2016-07-26 | 2016-12-14 | 佛山敏石芯片有限公司 | It is automatically adjusted the current-to-voltage converting circuit of range |
| CN111537774A (en) * | 2020-06-05 | 2020-08-14 | 镇江英创电力电子有限公司 | Multi-range high-precision high-voltage isolation transmitter and calibration method |
| CN113098442A (en) * | 2021-03-30 | 2021-07-09 | 青岛汉泰电子有限公司 | Four-channel oscilloscope and bandwidth and offset adjusting circuit |
| CN113406467A (en) * | 2021-06-01 | 2021-09-17 | 长江存储科技有限责任公司 | Auxiliary measuring circuit, measuring circuit and semiconductor device electric signal measuring method |
| CN113406467B (en) * | 2021-06-01 | 2022-06-24 | 长江存储科技有限责任公司 | Auxiliary measuring circuit, measuring circuit and semiconductor device electric signal measuring method |
| CN115575688A (en) * | 2022-09-29 | 2023-01-06 | 北京航天计量测试技术研究所 | Weak current detection circuit |
| CN115575688B (en) * | 2022-09-29 | 2023-11-07 | 北京航天计量测试技术研究所 | Weak current detection circuit |
| CN115629235A (en) * | 2022-10-25 | 2023-01-20 | 广西电网有限责任公司钦州供电局 | Power data monitoring system and method based on intelligent phase voltammeter |
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Open date: 20080813 |