CN203178354U - Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer - Google Patents
Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer Download PDFInfo
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- CN203178354U CN203178354U CN 201320006738 CN201320006738U CN203178354U CN 203178354 U CN203178354 U CN 203178354U CN 201320006738 CN201320006738 CN 201320006738 CN 201320006738 U CN201320006738 U CN 201320006738U CN 203178354 U CN203178354 U CN 203178354U
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- operational amplifier
- resistance
- phase
- current transformer
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Abstract
A three-phase AC electronic quantities detection circuit suitable for a one-chip microcomputer comprises a current transformer and a transformer secondary side signal pretreatment circuit and is characterized in that the transformer secondary side signal pretreatment circuit comprises a first operational amplifier circuit and a second operational amplifier circuit; the first operational amplifier circuit contains a first operational amplifier, a first RC phase compensation circuit, a first feedback resistor and a first anti-interference capacitor; and the second operational amplifier circuit contains a second operational amplifier, a second RC phase compensation circuit, a second feedback resistor and a second anti-interference capacitor. The three-phase AC electronic quantities detection circuit has advantages of simple hardware composition and high reliability, can be used to change a sinusoidal signal into two unipolar sine half-waves differing by half cycle, and is suitable for an AD converter and a one-chip microcomputer by single power supply. By the adoption of the circuit provided by the utility model, sine peak can reach the maximum input voltage of the AD converter, and detection precision is raised. In addition, nonlinearity degree of the current transformer is very low, antijamming capability is strong, and data processing is convenient after AD conversion.
Description
Technical field
The utility model relates to the detection pre-process circuit of ac electric, refers in particular to a kind of three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer, is used for detecting line voltage, line current and frequency thereof in the low-voltage three-phase AC.
Background technology
Utilizing single-chip microcomputer that line voltage, the line current of low-voltage three-phase AC detected is mainly used in the SCM Based control system.AD converter or independent AD conversion chip generally adopt the single power supply of 5V or 3.3V in the present single-chip microcomputer, and its detection method mainly contains three kinds.First kind be the alternating voltage amount that will exchange in the three-phase and ac flow by voltage and the current transformer progress of disease after rectification, become DC quantity and send into the detection of AD ALT-CH alternate channel through capacitor filtering by an electric resistance partial pressure taking-up part, this method reaction is slow, poor and the rectifier bridge of real-time is nonlinear element, can influence the precision of detection.Another kind method is by operational amplifier signal level value to be raised after voltage and the current transformer progress of disease, the scope that sinusoidal signal is changed all is within the accessible level of AD converter, this method needs special level to raise circuit and raises voltage source, and the scope of sinusoidal peak-peak change is less than the AD converter power supply, accuracy of detection is limited to, and the data after the conversion need be handled.Last a kind of method is to adopt the AD converter of dual power supply directly the bipolar signal after voltage and the current transformer progress of disease to be carried out the AD conversion, and must arrange negative and positive dual power this moment, causes the circuit hardware structure comparatively complicated.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned prior art present situation, provide a kind of hardware configuration simple, can obtain unipolarity output signal and the higher three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer of accuracy of detection.
The utility model solves the problems of the technologies described above the technical scheme that adopts: this is suitable for the three-phase AC electric quantity testing circuit of single-chip microcomputer, comprise current transformer and mutual inductor secondary side signal pre-processing circuit, it is characterized in that: described mutual inductor secondary side signal pre-processing circuit comprises first operational amplification circuit and second operational amplification circuit, described first operational amplification circuit comprises first operational amplifier, the one RC phase compensating circuit, first feedback resistance and first anti-interference capacitor, described second operational amplification circuit comprises second operational amplifier, the 2nd RC phase compensating circuit, second feedback resistance and second anti-interference capacitor.
Preferably, the positive input of described first operational amplifier and second operational amplifier links to each other and ground connection, a described RC phase compensating circuit comprises first electric capacity and second resistance, first end of this first electric capacity links to each other with the reverse input end of first end of described first feedback resistance and first operational amplifier and also is connected to first output terminal of described current transformer simultaneously, second end of this first electric capacity is connected with first end of described second resistance, the output terminal two of second end of described second resistance and second end of described first feedback resistance and first operational amplifier connects, first end of described first anti-interference capacitor links to each other with the output terminal of first operational amplifier, the second end ground connection of described first anti-interference capacitor; Described the 2nd RC phase compensating circuit comprises second electric capacity and the 3rd resistance, first end of this second electric capacity links to each other with the reverse input end of first end of described second feedback resistance and second operational amplifier and also is connected to second output terminal of described current transformer simultaneously, second end of this second electric capacity is connected with first end of described the 3rd resistance, the output terminal two of second end of described the 3rd resistance and second end of described second feedback resistance and second operational amplifier connects, first end of described second anti-interference capacitor links to each other with the output terminal of second operational amplifier, and second end of described second anti-interference capacitor links to each other with second end of described first anti-interference capacitor and ground connection.
Further preferred, also include first diode, second diode, the 5th resistance and the 6th resistance, described first diode and second diode oppositely arrange mutually and are connected in parallel between first output terminal and second output terminal of described current transformer, first end of described the 5th resistance links to each other with first output terminal of current transformer, first end of described the 6th resistance links to each other with second output terminal of current transformer, and second end of described the 5th resistance links to each other with second end of the 6th resistance and ground connection.
In order to control the electric current that flows through the current transformer primary side, the primary side of described current transformer is provided with input resistance.And input resistance all adopts big resistance.
If be used for detecting low pressure three-phase electricity route voltage, described current transformer is HPT300AC.
If be used for detecting low pressure three-phase circuit line current, described current transformer is HCT255.
Preferred as above-mentioned arbitrary scheme, described first operational amplifier and second operational amplifier all adopt LM324.
Compared with prior art, advantage of the present utility model is: this three-phase AC electric quantity testing circuit comprises current transformer, operational amplifier, resistance and capacity cell etc., can be used for detecting the line voltage in the low-voltage three-phase AC, line current and frequency thereof, hardware constitutes simple, the reliability height, import the sinusoidal signal by the current transformer progress of disease, output signal is the unipolarity half-sinusoid of two mutual deviation half period, be suitable for the AD converter of single power supply and the occasion of single-chip microcomputer or AD chip detection three-phase AC electric quantity, and sinusoidal peak value can reach the AD converter maximum input voltage, has improved accuracy of detection.In addition, the current transformer nonlinearity is very little, and antijamming capability is strong, AD conversion back convenient data processing.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model embodiment.
Embodiment
Describe in further detail below in conjunction with the utility model of accompanying drawing embodiment.
As shown in Figure 1, the three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer in the present embodiment comprises current transformer and mutual inductor secondary side signal pre-processing circuit.Present embodiment is used for detecting low pressure three-phase electricity route voltage, thereby current transformer CT adopts HPT3000AC, mutual inductor secondary side signal pre-processing circuit comprises first operational amplification circuit and second operational amplification circuit, wherein, first operational amplification circuit comprises first operational amplifier A 1, a RC phase compensating circuit, the first feedback resistance R
1With the first anti-interference capacitor C
3, second operational amplification circuit comprises second operational amplifier A 2, the 2nd RC phase compensating circuit, the second feedback resistance R
4With the second anti-interference capacitor C
4
Particularly, the positive input of first operational amplifier A 1 and second operational amplifier A 2 links to each other and ground connection, and a RC phase compensating circuit comprises first capacitor C
1With second resistance R
2, first capacitor C
1First end and the first feedback resistance R
1First end and the reverse input end of first operational amplifier A 1 link to each other and be connected to first output terminal of current transformer CT, first capacitor C simultaneously
1Second end and second resistance R
2First end be connected second resistance R
2Second end and the first feedback resistance R
1Second end and the output terminal two of first operational amplifier A 1 connect the first anti-interference capacitor C
3First end link to each other the first anti-interference capacitor C with the output terminal of first operational amplifier A 1
3The second end ground connection; The 2nd RC phase compensating circuit comprises second capacitor C
2With the 3rd resistance R
3, second capacitor C
2First end and the second feedback resistance R
4First end and the reverse input end of second operational amplifier A 2 link to each other and be connected to second output terminal of current transformer CT, second capacitor C simultaneously
2Second end and the 3rd resistance R
3First end be connected the 3rd resistance R
3Second end and the second feedback resistance R
4Second end and the output terminal two of second operational amplifier A 2 connect the second anti-interference capacitor C
4First end link to each other the second anti-interference capacitor C with the output terminal of second operational amplifier A 2
4Second end and the first anti-interference capacitor C
3Second end link to each other and ground connection.
In the present embodiment, this three-phase AC electric quantity testing circuit also includes the first diode D
1, the second diode D
2, the 5th resistance R
5With the 6th resistance R
6, wherein, the first diode D
1With the second diode D
2Oppositely arrange and be connected in parallel between first output terminal and second output terminal of described current transformer CT, described the 5th resistance R mutually
5First end link to each other described the 6th resistance R with first output terminal of current transformer CT
6First end link to each other the 5th resistance R with second output terminal of current transformer CT
5Second end and the 6th resistance R
6Second end link to each other and ground connection.In order to control the electric current that flows through the current transformer primary side, the primary side of current transformer CT is provided with input resistance R
0, and, input resistance R
0All adopt big resistance.In addition, first operational amplifier A 1 and second operational amplifier A 2 all adopt LM324.
Principle of work: the voltage signal of alternating voltage input is become the current signal of 0-10 milliampere, and a secondary current transfer ratio is 1:1, has the favorable linearity duty in the size of current of 0-10 milliampere.Input resistance R
0Be big resistance, making the electric current that flows through the mutual inductor primary side is 2 milliamperes.Diode D
1And D
2For the protection of the mutual inductor secondary side, D during operate as normal
1And D
2All end resistance R
5And R
6Be 10 ohm resistance, first capacitor C
1, second resistance R
2With second capacitor C
2, the 3rd resistance R
3Play effect of phase compensation, compensating signal is because the phase shift that mutual inductor coil produces.The first anti-interference capacitor C
3, the second anti-interference capacitor C
4Get 1000 pico farads, the first feedback resistance R
1With the second feedback resistance R
4It is fixed to come according to required output signal half-sinusoid peak value size.First operational amplifier A 1 and second operational amplifier A 2 all adopt single power supply.When input ac voltage is in positive half cycle, operational amplifier A 2 work this moment second amplification input signals, and first operational amplifier A 1 is not worked, the output terminal output half-sinusoid of second operational amplifier A 2, and the output terminal output voltage of first operational amplifier A 1 is zero.When input ac voltage is in negative half period, operational amplifier A 1 work this moment first amplification input signal, and second operational amplifier A 2 is not worked, the output terminal output half-sinusoid of first operational amplifier A 1, and the output terminal output voltage of second operational amplifier A 2 is zero.At this moment, the output terminal of the output terminal of first operational amplifier A 1 and two operational amplifier A 2 can obtain the half-sinusoid signal in two unipolar phase difference of half cycles, the AD converter and the single-chip microcomputer that are suitable for single power supply, and sinusoidal peak value can reach the AD converter maximum input voltage, improved accuracy of detection, its accuracy of detection is to raise 2 times of level method accuracy of detection.And the current transformer nonlinearity is very little, and antijamming capability is strong, AD conversion back convenient data processing.
In addition, this three-phase alternating current electric weight testing circuit can also be used for detecting frequency, when detecting frequency, then only need input to voltage comparator and earth potential comparison with the output terminal of first operational amplifier A 1 or the output terminal of second operational amplifier A 2, can obtain the negative burst pulse every the one-period generation, utilize single-chip microcomputer to catch negative burst pulse and can detect frequency.
The above only is preferred implementation of the present utility model; should be understood that; for those of ordinary skills; do not breaking away under the principle prerequisite of the present utility model; can make multiple remodeling or improvement to the utility model; when being used for the detection line electric current; current transformer adopts HCT255; pass lead in the hole of current transformer HCT255 this moment; become the 0-10 milliampere with interior little current signal by the progress of disease of HCT255 current transformer big current signal; subsequent treatment also is to detect through two unipolarities of signal pre-processing circuit variation and the half-sinusoid in phase place phase difference of half cycle, and this is regarded as within the protection domain of the present utility model equally.
Claims (7)
1. three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer, comprise current transformer (CT) and mutual inductor secondary side signal pre-processing circuit, it is characterized in that: described mutual inductor secondary side signal pre-processing circuit comprises first operational amplification circuit and second operational amplification circuit, and described first operational amplification circuit comprises first operational amplifier (A1), a RC phase compensating circuit, the first feedback resistance (R
1) and the first anti-interference capacitor (C
3), described second operational amplification circuit comprises second operational amplifier (A2), the 2nd RC phase compensating circuit, the second feedback resistance (R
4) and the second anti-interference capacitor (C
4).
2. the three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer according to claim 1, it is characterized in that: the positive input of described first operational amplifier (A1) and second operational amplifier (A2) links to each other and ground connection, and a described RC phase compensating circuit comprises the first electric capacity (C
1) and the second resistance (R
2), this first electric capacity (C
1) first end and the described first feedback resistance (R
1) first end and the reverse input end of first operational amplifier (A1) link to each other and be connected to first output terminal of described current transformer (CT), this first electric capacity (C simultaneously
1) second end and the described second resistance (R
2) first end be connected the described second resistance (R
2) second end and the described first feedback resistance (R
1) second end and the output terminal two of first operational amplifier (A1) connect the described first anti-interference capacitor (C
3) first end link to each other the described first anti-interference capacitor (C with the output terminal of first operational amplifier (A1)
3) the second end ground connection; Described the 2nd RC phase compensating circuit comprises the second electric capacity (C
2) and the 3rd resistance (R
3), this second electric capacity (C
2) first end and the described second feedback resistance (R
4) first end and the reverse input end of second operational amplifier (A2) link to each other and be connected to second output terminal of described current transformer (CT), this second electric capacity (C simultaneously
2) second end and described the 3rd resistance (R
3) first end be connected described the 3rd resistance (R
3) second end and the described second feedback resistance (R
4) second end and the output terminal two of second operational amplifier (A2) connect the described second anti-interference capacitor (C
4) first end link to each other the described second anti-interference capacitor (C with the output terminal of second operational amplifier (A2)
4) second end and the described first anti-interference capacitor (C
3) second end link to each other and ground connection.
3. the three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer according to claim 2 is characterized in that: also include the first diode (D
1), the second diode (D
2), the 5th resistance (R
5) and the 6th resistance (R
6), the described first diode (D
1) and the second diode (D
2) oppositely arrange mutually and be connected in parallel between first output terminal and second output terminal of described current transformer (CT), described the 5th resistance (R
5) first end link to each other described the 6th resistance (R with first output terminal of current transformer (CT)
6) first end link to each other described the 5th resistance (R with second output terminal of current transformer (CT)
5) second end and the 6th resistance (R
6) second end link to each other and ground connection.
4. the three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer according to claim 1, it is characterized in that: the primary side of described current transformer (CT) is provided with input resistance (R
0).
5. according to any one described three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer in the claim 1 to 4, it is characterized in that: described current transformer (CT) is HPT300AC.
6. according to any one described three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer in the claim 1 to 4, it is characterized in that: described current transformer (CT) is HCT255.
7. according to any one described three-phase AC electric quantity testing circuit that is suitable for single-chip microcomputer in the claim 1 to 4, it is characterized in that: described first operational amplifier (A1) and second operational amplifier (A2) all adopt LM324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320006738 CN203178354U (en) | 2013-01-06 | 2013-01-06 | Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320006738 CN203178354U (en) | 2013-01-06 | 2013-01-06 | Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer |
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| Publication Number | Publication Date |
|---|---|
| CN203178354U true CN203178354U (en) | 2013-09-04 |
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ID=49075032
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320006738 Expired - Fee Related CN203178354U (en) | 2013-01-06 | 2013-01-06 | Three-phase AC electronic quantities detection circuit suitable for one-chip microcomputer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044447A (en) * | 2015-08-27 | 2015-11-11 | 许继集团有限公司 | Double AD real-time monitoring acquisition circuit |
| CN107247174A (en) * | 2017-07-24 | 2017-10-13 | 重庆环投生态环境监测网络与工程治理有限公司 | Monitor the circuit of sewage disposal device multichannel operating mode electric current |
| CN110161302A (en) * | 2019-06-26 | 2019-08-23 | 广西盟创智慧科技有限公司 | A kind of conversion circuit |
| CN110376425A (en) * | 2019-06-26 | 2019-10-25 | 杭州电子科技大学 | A kind of three-phase input signal zero detection circuit |
| CN111610424A (en) * | 2019-02-26 | 2020-09-01 | 圣邦微电子（北京）股份有限公司 | Test circuit, test method and test device for operational amplifier |
| CN111751605A (en) * | 2019-03-29 | 2020-10-09 | 全球能源互联网研究院有限公司 | High potential voltage measuring device and method |
| CN112816756A (en) * | 2021-01-06 | 2021-05-18 | 四川众航电子科技有限公司 | Hall sensor device for measuring alternating current |
-
2013
- 2013-01-06 CN CN 201320006738 patent/CN203178354U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044447A (en) * | 2015-08-27 | 2015-11-11 | 许继集团有限公司 | Double AD real-time monitoring acquisition circuit |
| CN105044447B (en) * | 2015-08-27 | 2018-05-11 | 许继集团有限公司 | Double AD monitor Acquisition Circuit in real time |
| CN107247174A (en) * | 2017-07-24 | 2017-10-13 | 重庆环投生态环境监测网络与工程治理有限公司 | Monitor the circuit of sewage disposal device multichannel operating mode electric current |
| CN111610424A (en) * | 2019-02-26 | 2020-09-01 | 圣邦微电子（北京）股份有限公司 | Test circuit, test method and test device for operational amplifier |
| CN111751605A (en) * | 2019-03-29 | 2020-10-09 | 全球能源互联网研究院有限公司 | High potential voltage measuring device and method |
| CN111751605B (en) * | 2019-03-29 | 2024-01-16 | 全球能源互联网研究院有限公司 | High-potential voltage measuring device and method |
| CN110161302A (en) * | 2019-06-26 | 2019-08-23 | 广西盟创智慧科技有限公司 | A kind of conversion circuit |
| CN110376425A (en) * | 2019-06-26 | 2019-10-25 | 杭州电子科技大学 | A kind of three-phase input signal zero detection circuit |
| CN110376425B (en) * | 2019-06-26 | 2021-09-14 | 杭州电子科技大学 | Three-phase input signal zero detection circuit |
| CN112816756A (en) * | 2021-01-06 | 2021-05-18 | 四川众航电子科技有限公司 | Hall sensor device for measuring alternating current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130904 Termination date: 20140106 |