CN205786850U - A kind of mains by harmonics signals collecting pretreatment circuit - Google Patents
A kind of mains by harmonics signals collecting pretreatment circuit Download PDFInfo
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- CN205786850U CN205786850U CN201620479657.5U CN201620479657U CN205786850U CN 205786850 U CN205786850 U CN 205786850U CN 201620479657 U CN201620479657 U CN 201620479657U CN 205786850 U CN205786850 U CN 205786850U
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Abstract
This utility model relates to a kind of mains by harmonics signals collecting pretreatment circuit.Including voltage signal pretreatment circuit and current signal pretreatment circuit, voltage signal pretreatment circuit includes Hall voltage sensor and voltage filtering circuit, electrical network three-phase voltage outfan is connected with Hall voltage sensor input, the outfan of Hall voltage sensor is connected with voltage filtering circuit input, and filter circuit outfan accesses the input of the harvester with A/D conversion again.Current signal pretreatment circuit includes Hall current sensor, current filtering circuit and amplifying circuit, electrical network three-phase current outfan connects Hall current sensor input, Hall current sensor outfan connects block isolating circuit input, block isolating circuit, through current filtering circuit and amplifying circuit, is connected to the input with the harvester of A/D conversion.This utility model can remove the interference of DC component, noise and higher hamonic wave in mains by harmonics signal, it is ensured that gathers the accuracy of data.
Description
Technical field
This utility model belongs to Power Quality Monitoring Technology field, particularly relates to a kind of mains by harmonics signals collecting pretreatment circuit.
Background technology
In recent years, due to a large amount of uses of nonlinear-load, cause harmonic pollution in electric power net serious.Harmonic Detection is to solve the basis of harmonic problem, and ensures that the accuracy of harmonic signal data acquisition is the basic of harmonic detecting.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of mains by harmonics signals collecting pretreatment circuit, the interference of DC component, noise and higher hamonic wave in mains by harmonics signal can be removed, ensure to gather the accuracy of data, and then improve the accuracy of harmonic detecting.
This utility model is realized in, a kind of mains by harmonics signals collecting pretreatment circuit, including voltage signal pretreatment circuit and current signal pretreatment circuit, described voltage signal pretreatment circuit includes Hall voltage sensor and voltage filtering circuit, electrical network three-phase voltage outfan is connected with Hall voltage sensor input, the outfan of Hall voltage sensor is connected with voltage filtering circuit input, and filter circuit outfan accesses the input of the harvester with A/D conversion again.Current signal pretreatment circuit includes Hall current sensor, current filtering circuit and amplifying circuit, electrical network three-phase current outfan connects Hall current sensor input, Hall current sensor outfan connects block isolating circuit input, block isolating circuit, through current filtering circuit and amplifying circuit, is connected to the input with the harvester of A/D conversion.
Further, voltage filtering circuit uses unlimited gain multiple feedback low pass filter.
Further, Hall current sensor uses pincerlike Hall current sensor.
Further, described current filtering circuit uses biquadratic band filter.
Further, amplifying circuit uses two-stage calculation amplifier circuit.
This utility model is compared with prior art, have the beneficial effects that: this utility model can remove the interference of DC component, noise and higher hamonic wave in mains by harmonics signal, ensure to gather the accuracy of data, and then improve the accuracy of harmonic detecting, it is possible to preferably provide help for solution harmonic problem.And, by this utility model, can effectively reduce the cost of harmonic detecting.
Accompanying drawing explanation
The block diagram of the mains by harmonics signals collecting pretreatment circuit of the embodiment that Fig. 1 provides for this utility model；
The voltage filtering circuit that Fig. 2 provides for this utility model；
The current amplification circuit that Fig. 3 provides for this utility model.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
As it is shown in figure 1, a kind of mains by harmonics signals collecting pretreatment circuit, this circuit includes voltage signal pretreatment circuit and current signal pretreatment circuit.The input of voltage signal pretreatment circuit is connected to the voltage output end of monitoring point, through Hall voltage sensor blood pressure lowering, then filters noise signal and higher hamonic wave through voltage filtering circuit.Current signal pretreatment circuit passes through current Hall sensor acquisition current signal, then filters DC component, noise and higher hamonic wave through current filtering circuit, amplifies signal finally by amplifying circuit.
According to national standard, the voltage at power network monitoring point secondary side is output as 100V, and electric current output is 5A to the maximum.According to practical situation, Hall voltage current sensor selects CHV-50P closed loop Hall voltage sensor and the A622 pincer current probe of Imtech of the U.S. of Beijing Sen She company.
During electric harmonic analysis, it is considered to the impact of 50 subharmonic, when designing wave filter, the cut-off frequency f of wave filterc=50 × 50=2.5kHz.
Voltage filtering circuit uses second order or even order to cascade unlimited gain multiple feedback low pass filter.As shown in Figure 2, as a example by A phase voltage, in-phase input end at an amplifier U1 connects electric capacity C1, divider resistance R1 is connected to input by electric capacity C1, resistance R1 is connected to the inverting input of amplifier through resistance R2, go between resistance R1 and resistance R2 and be connected to the outfan of amplifier by resistance R3, between the inverting input and outfan of amplifier, be connected electric capacity C2.
Use second order Infinite gain multiple feedback low pass filter, by cut-off frequency fc, the type of gain G and wave filter can select the nominal value of an electric capacity C, then byObtain parameter K, utilize this K value comparison wave filter design table to determine remaining component value.Select as close possible to the resistance of numerical value in wave filter design table, when low order, be generally the nominal resistance of 5% by tolerance, during high-order, need the resistance selecting tolerance less.
Current signal comprises DC component, in order to improve the accuracy of harmonic detecting, needs to filter this DC component.Current signal filters the impact of DC component, noise and higher hamonic wave by the band filter of 10Hz～2.5KHz.
Current filtering circuit uses second order or the even order biquadratic band filter of cascade.As it is shown on figure 3, as a example by A phase, use second order voltage controlled voltage source band filter, according to mid frequency fo, gain G and bandwidth B design circuit, first select an electric capacity C nominal value, then byObtain parameter K, utilize this K value comparison wave filter design table to determine remaining component value.
The current signal that Tyke A622 current probe collection comes is about 0～500mA, and the range of A/D Acquisition Circuit is 10V, in order to improve acquisition precision, needs to be amplified current signal.As shown in Figure 3, amplifying circuit uses two-stage calculation amplifying circuit, connect with amplifier U3 for amplifier U2, series resistance R4 between amplifier U2 and amplifier U3, input is connected to the inverting input of amplifier U2 by resistance R7, the normal phase input end of amplifier U2 connects resistance R9 ground connection, resistance R8 it is connected between the inverting input of amplifier and outfan, same, normal phase input end at amplifier U3 connects resistance R6 ground connection, it is connected resistance R5 between the inverting input and outfan of amplifier U3, thus realizing amplification is 10, two-stage calculation amplifying circuit produces 360 ° of phase shifts, current signal will not be produced phase shift impact, ensure that the accuracy of signals collecting phase place.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (5)
- null1. a mains by harmonics signals collecting pretreatment circuit，It is characterized in that，Including voltage signal pretreatment circuit and current signal pretreatment circuit，Described voltage signal pretreatment circuit includes Hall voltage sensor and voltage filtering circuit，Electrical network three-phase voltage outfan is connected with Hall voltage sensor input，The outfan of Hall voltage sensor is connected with voltage filtering circuit input，Filter circuit outfan accesses the input of the harvester with A/D conversion again，Current signal pretreatment circuit includes Hall current sensor、Current filtering circuit and amplifying circuit，Electrical network three-phase current outfan connects Hall current sensor input，Hall current sensor outfan connects block isolating circuit input，Block isolating circuit is through current filtering circuit and amplifying circuit，It is connected to the input with the harvester of A/D conversion.
- Mains by harmonics signals collecting pretreatment circuit the most according to claim 1, it is characterised in that voltage filtering circuit uses unlimited gain multiple feedback low pass filter.
- Mains by harmonics signals collecting pretreatment circuit the most according to claim 1, it is characterised in that Hall current sensor uses pincerlike Hall current sensor.
- Mains by harmonics signals collecting pretreatment circuit the most according to claim 1, it is characterised in that described current filtering circuit uses biquadratic band filter.
- Mains by harmonics signals collecting pretreatment circuit the most according to claim 1, it is characterised in that amplifying circuit uses two-stage calculation amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620479657.5U CN205786850U (en) | 2016-05-24 | 2016-05-24 | A kind of mains by harmonics signals collecting pretreatment circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620479657.5U CN205786850U (en) | 2016-05-24 | 2016-05-24 | A kind of mains by harmonics signals collecting pretreatment circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205786850U true CN205786850U (en) | 2016-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620479657.5U Expired - Fee Related CN205786850U (en) | 2016-05-24 | 2016-05-24 | A kind of mains by harmonics signals collecting pretreatment circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN205786850U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983343A (en) * | 2020-07-22 | 2020-11-24 | 宁波燕清汽车技术有限公司 | Current type wheel speed sensor acquisition circuit |
| CN112653403A (en) * | 2020-12-24 | 2021-04-13 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal for reducing load change sensitivity |
-
2016
- 2016-05-24 CN CN201620479657.5U patent/CN205786850U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983343A (en) * | 2020-07-22 | 2020-11-24 | 宁波燕清汽车技术有限公司 | Current type wheel speed sensor acquisition circuit |
| CN112653403A (en) * | 2020-12-24 | 2021-04-13 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal for reducing load change sensitivity |
| CN112653403B (en) * | 2020-12-24 | 2023-03-14 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal for reducing load change sensitivity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20161207 Termination date: 20170524 |