CN200989920Y - Electric energy quality tester signal dispensable circuit - Google Patents
Electric energy quality tester signal dispensable circuit Download PDFInfo
- Publication number
- CN200989920Y CN200989920Y CN 200620162438 CN200620162438U CN200989920Y CN 200989920 Y CN200989920 Y CN 200989920Y CN 200620162438 CN200620162438 CN 200620162438 CN 200620162438 U CN200620162438 U CN 200620162438U CN 200989920 Y CN200989920 Y CN 200989920Y
- Authority
- CN
- China
- Prior art keywords
- transport
- placing device
- resistance
- circuit
- adjustment circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model relates to a signal adjusting circuit of an electric quality analyzer, which adjusts the voltage and current signals of the electric power system. The utility model relates to a signal adjusting circuit of an electric quality analyzer, which is characterized in that the signal adjusting circuit is composed of a zero adjusting circuit, a plus adjusting circuit and an anti aliasing filter; the zero adjusting circuit is connected with the plus adjusting circuit; the plus adjusting circuit is connected with the anti aliasing filter; the zero adjusting circuit, the plus adjusting circuit and the anti aliasing filter form an adjusting circuit; two identical adjusting circuits are arranged at a module; the zero adjusting circuit and the plus adjusting circuit are connected with a potentiometer outside the module. The utility model reduces the zero adjusting circuit, eliminates the imbalance voltage inputted the transporting and placing machine, and lowers the errors. The anti aliasing filter can effectively restrain the harmonic wave with frequency above 156 for the signal with fundamental frequency of 50 Hz so as to effectively prevent the error of the detecting system caused by the import of high frequency components.
Description
(1) technical field
The utility model relates to a kind of signal conditioning circuit of power quality analyzer, and this signal conditioning circuit is that the voltage of electric energy quality test instrument secondary circuit, current signal are nursed one's health.
(2) background technology
The quality of power supply is the important component part of environmental quality, make consumer normally powerup issue all be power quality problem.In recent years, along with developing rapidly and the widespread use of power electronic equipment (controllable silicon, electronic rectifier, frequency converter etc.) of electric system, a large amount of nonlinear-loads increase sharply, make numerous harmonic currents inject electric power networks, cause voltage and current wave form distortion in the power network, form electric network pollution.Therefore, the monitoring to the quality of power supply of the points of common connection of different brackets electrical network mainly is the fluctuation and the flickering of harmonic wave, frequency, supply voltage deviation and the voltage of monitoring voltage, electric current.When measuring these parameters, require sampling precision height, bandwidth, speed is fast, reliability is high, collection and the conditioning to signal just proposed very high requirement like this.
The signal conditioning circuit of the power quality analyzer on the market does not have specific employing anti-jamming circuit now, and precision is low, frequency band is narrow, can only reach to measure 50 times harmonic wave, can not satisfy the needs of power network development.
(3) summary of the invention
The purpose of this utility model is to provide a kind of electric energy quality test instrument signal conditioning circuit, and this signal conditioning circuit antijamming capability is strong, precision is high, bandwidth, good reliability.
The utility model is achieved in that a kind of electric energy quality test instrument signal conditioning circuit, and it is characterized in that: described signal conditioning circuit is made up of zero adjustment circuit, gain adjustment circuit and frequency overlapped-resistable filter; Zero adjustment circuit connects gain adjustment circuit, and gain adjustment circuit connects frequency overlapped-resistable filter; Zero adjustment circuit, gain adjustment circuit and frequency overlapped-resistable filter are formed one road modulate circuit, do two identical modulate circuits on a module, and zero adjustment circuit and gain adjustment circuit be external potentiometer outside module.
Described zero adjustment circuit comprises transport and placing device, resistance, adjusting resistance, resistance R 4, R3 and connect after connect the input positive pole of transport and placing device U1A, resistance 4 other end connecting to neutral points, the external regulator potentiometer W7 of resistance R 3 other ends, regulator potentiometer W7 two termination power supplys, connect transport and placing device input negative pole behind the input signal series resistor R1, resistance R 2 cross-over connection transport and placing devices input negative pole and output stage.
Described gain adjustment circuit comprises transport and placing device, resistance, adjusting resistance, resistance R 5 and R6 and connect after connect the input negative pole of transport and placing device U1D, transport and placing device output cathode connecting to neutral point, resistance R 5 other ends connect the transport and placing device U1A output stage of zero adjustment circuit, resistance R 6 other ends are connected in series external potentiometer W8, the other end of the external potentiometer W8 of transport and placing device U1D output stage.
Described frequency overlapped-resistable filter is made up of three grades of filtering circuits and transport and placing device, first order filtering circuit comprises resistance, electric capacity, the output stage of capacitor C 1 one termination one-level transport and placing device U2B, the other end and connecting resistance R7, R8, the transport and placing device U1D output stage of resistance R 7 another termination gain adjustment circuits, resistance R 8 another termination one-level transport and placing device U2B import anodal, capacitor C 2 one termination one-level transport and placing device U2B import anodal, other end connecting to neutral point, one-level transport and placing device U2B input negative pole cross-over connection one-level transport and placing device U2B output stage; Other second level is identical with the transport and placing device structure with first order filtering circuit with transport and placing device with third level filtering circuit.
The zeroing circuit of the utility model signal conditioning circuit reduces and eliminates the offset voltage of input operational amplifier, reduces error; Frequency overlapped-resistable filter is the signal of 50Hz for fundamental frequency, can effectively suppress the harmonic wave more than 156 times, thereby effectively prevents because the introducing of radio-frequency component makes measuring system produce bigger error.
Signal conditioning circuit antijamming capability of the present utility model is strong, precision is high, bandwidth, speed is fast, reliability is high.
(4) description of drawings
Fig. 1 is the circuit diagram that contains the utility model signal conditioning circuit module;
Fig. 2 is the utility model electric energy quality test instrument signal conditioning circuit circuit theory diagrams;
Among the figure: 1 zero adjustment circuit, 2 gain adjustment circuits, 3 frequency overlapped-resistable filters.
(5) embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, Fig. 2, a kind of electric energy quality test instrument signal conditioning circuit is made up of zero adjustment circuit 1, gain adjustment circuit 2 and frequency overlapped-resistable filter 3.Zero adjustment circuit 1 connects gain adjustment circuit 2, and gain adjustment circuit 2 connects frequency overlapped-resistable filter 3; Zero adjustment circuit 1, gain adjustment circuit 2 and frequency overlapped-resistable filter 3 are formed one road modulate circuit, do two identical modulate circuits on a module, zero adjustment circuit 1 and gain adjustment circuit 2 external potentiometer outside module.
Referring to Fig. 1, the two-way simulating signal of input is introduced from output terminal IN2 and IN1 respectively, exports from output terminal OUT1 and OUT2 respectively after resume module.Two potentiometers of W5 and W7 are zero potentiometer, and two potentiometers of W6 and W8 are for transferring the gain potentiometer.
Referring to Fig. 2, hold external potentiometer W8, W6 at GainAdjust, be used for gain-adjusted.Hold external potentiometer W7, W5 at Zero Adjust, be used for regulating zero point.
Signal flow is as follows: gather the signal of coming in and at first will carry out zero point and gain adjustment through zero crossing and gain adjustment circuit 1,2, advance frequency overlapped-resistable filter 3 then and carry out the filtering amplification.Frequency overlapped-resistable filter 3 is the signal of 50Hz for fundamental frequency, can effectively suppress the harmonic wave more than 156 times, thereby effectively prevents because the introducing of radio-frequency component makes system produce bigger error.
Referring to Fig. 2, zero adjustment circuit 1 comprises transport and placing device, resistance, adjusting resistance, resistance R 4, R3 and connect after connect the input positive pole of transport and placing device U1A, resistance 4 other end connecting to neutral points, the external regulator potentiometer W7 of resistance R 3 other ends, regulator potentiometer W7 two termination power supplys connect transport and placing device input negative pole, resistance R 2 cross-over connection transport and placing devices input negative pole and output stage behind the input signal series resistor R1.The value of resistance R 1, R2, R3, R4 is 10K, and transport and placing device U1A is TL084, and the value of zero potentiometer W7 is 50K.
Frequency overlapped-resistable filter 3 is made up of three grades of filtering circuits and transport and placing device, first order filtering circuit comprises resistance, electric capacity, the output stage of capacitor C 1 one termination one-level transport and placing device U2B, the other end and connecting resistance R7, R8, the transport and placing device U1D output stage of resistance R 7 another termination gain adjustment circuits 2, resistance R 8 another termination one-level transport and placing device U2B are imported anodal, and capacitor C 2 one termination one-level transport and placing device U2B import anodal, other end connecting to neutral point, one-level transport and placing device U2B input negative pole cross-over connection one-level transport and placing device U2B output stage; Other second level is identical with the transport and placing device structure with first order filtering circuit with transport and placing device with third level filtering circuit.Resistance R 7 in first order filtering circuit and the transport and placing device, the value of R8 are 5.172K, and the value of capacitor C 1, C2 is respectively 0.0136uF, 6800pF, and transport and placing device U2B is TL084; Resistance R 9 in second level filtering circuit and the transport and placing device, the value of R10 are 7.4895K, and the value of capacitor C 3, C4 is respectively 6800pF, 6485pF, and transport and placing device U3B is TL084; Resistance R 11 in third level filtering circuit and the transport and placing device, the value of R12 are 29.956K, and the value of capacitor C 5, C6 is respectively 6800pF, 405.3pF, and transport and placing device U3A is TL084.
To the application scenario that DC precision is had relatively high expectations, when especially working under the high voltage enlargement factor, the input offset voltage of operational amplifier input end is exactly important source of error.In order to reduce and to eliminate this error, design zeroing amplifying circuit in circuit.Voltage signal after the amplification is wave circuit after filtration again, the radio-frequency component of filtered signal.This filtering circuit has the response of open width degree in the scope less than cutoff frequency, and after greater than cutoff frequency, amplitude-frequency response descends rapidly.Original signal is lower than the low-pass filter of fs/2 by bandwidth, and elimination is higher than the component of fs/2, and such signal is carried out discrete Fourier transform (DFT) (DFT analysis) again, with not occurring being higher than the component of fs/2 again, prevents the interference that high frequency causes.Though because of filtering loses the component that is higher than the fs/2 frequency, filtered signal can be explained accurately like this, aliasing can not appear therefore, and therefore DFT analyzes also can not cause error.
Claims (7)
1. electric energy quality test instrument signal conditioning circuit, it is characterized in that: described signal conditioning circuit is made up of zero adjustment circuit, gain adjustment circuit and frequency overlapped-resistable filter; Zero adjustment circuit connects gain adjustment circuit, and gain adjustment circuit connects frequency overlapped-resistable filter; Zero adjustment circuit, gain adjustment circuit and frequency overlapped-resistable filter are formed one road modulate circuit, do two identical modulate circuits on a module, and zero adjustment circuit and gain adjustment circuit be external potentiometer outside module.
2. electric energy quality test instrument signal conditioning circuit according to claim 1, it is characterized in that: zero adjustment circuit comprises transport and placing device, resistance, adjusting resistance, resistance R 4, R3 and connect after connect the input positive pole of transport and placing device U1A, resistance 4 other end connecting to neutral points, the external regulator potentiometer W7 of resistance R 3 other ends, regulator potentiometer W7 two termination power supplys connect transport and placing device input negative pole, resistance R 2 cross-over connection transport and placing devices input negative pole and output stage behind the input signal series resistor R1.
3. electric energy quality test instrument signal conditioning circuit according to claim 2, it is characterized in that: the value of resistance R 1, R2, R3, R4 is 10K, and transport and placing device U1A is TL084, and the value of zero potentiometer W7 is 50K.
4. electric energy quality test instrument signal conditioning circuit according to claim 1, it is characterized in that: gain adjustment circuit comprises transport and placing device, resistance, adjusting resistance, resistance R 5 and R6 and connect after connect the input negative pole of transport and placing device U1D, transport and placing device output cathode connecting to neutral point, resistance R 5 other ends connect the transport and placing device U1A output stage of zero adjustment circuit, resistance R 6 other ends are connected in series external potentiometer W8, the other end of the external potentiometer W8 of transport and placing device U1D output stage.
5. electric energy quality test instrument signal conditioning circuit according to claim 4, it is characterized in that: the value of resistance R 5, R6 is respectively 10K, 5K, and transport and placing device U1D is TL084, and transferring the value of gain potentiometer W8 is 10K.
6. electric energy quality test instrument signal conditioning circuit according to claim 1, it is characterized in that: frequency overlapped-resistable filter is made up of three grades of filtering circuits and transport and placing device, first order filtering circuit comprises resistance, electric capacity, the output stage of capacitor C 1 one termination one-level transport and placing device U2B, the other end and connecting resistance R7, R8, the transport and placing device U1D output stage of resistance R 7 another termination gain adjustment circuits, resistance R 8 another termination one-level transport and placing device U2B import anodal, capacitor C 2 one termination one-level transport and placing device U2B import anodal, other end connecting to neutral point, one-level transport and placing device U2B input negative pole cross-over connection one-level transport and placing device U2B output stage; Other second level is identical with the transport and placing device structure with first order filtering circuit with transport and placing device with third level filtering circuit.
7. electric energy quality test instrument signal conditioning circuit according to claim 6, it is characterized in that: the resistance R 7 in first order filtering circuit and the transport and placing device, the value of R8 are 5.172K, the value of capacitor C 1, C2 is respectively 0.0136uF, 6800pF, and transport and placing device U2B is TL084; Resistance R 9 in second level filtering circuit and the transport and placing device, the value of R10 are 7.4895K, and the value of capacitor C 3, C4 is respectively 6800pF, 6485pF, and transport and placing device U3B is TL084; Resistance R 11 in third level filtering circuit and the transport and placing device, the value of R12 are 29.956K, and the value of capacitor C 5, C6 is respectively 6800pF, 405.3pF, and transport and placing device U3A is TL084.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620162438 CN200989920Y (en) | 2006-12-29 | 2006-12-29 | Electric energy quality tester signal dispensable circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620162438 CN200989920Y (en) | 2006-12-29 | 2006-12-29 | Electric energy quality tester signal dispensable circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200989920Y true CN200989920Y (en) | 2007-12-12 |
Family
ID=38940957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620162438 Expired - Lifetime CN200989920Y (en) | 2006-12-29 | 2006-12-29 | Electric energy quality tester signal dispensable circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200989920Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355263A (en) * | 2011-05-24 | 2012-02-15 | 华北电力大学 | Improved signal acquisition conditioning circuit |
| CN102866652A (en) * | 2012-09-19 | 2013-01-09 | 北京滨松光子技术股份有限公司 | Real-time zero-returning control method |
-
2006
- 2006-12-29 CN CN 200620162438 patent/CN200989920Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355263A (en) * | 2011-05-24 | 2012-02-15 | 华北电力大学 | Improved signal acquisition conditioning circuit |
| CN102355263B (en) * | 2011-05-24 | 2014-03-05 | 华北电力大学 | Improved signal acquisition conditioning circuit |
| CN102866652A (en) * | 2012-09-19 | 2013-01-09 | 北京滨松光子技术股份有限公司 | Real-time zero-returning control method |
| CN102866652B (en) * | 2012-09-19 | 2017-03-22 | 北京滨松光子技术股份有限公司 | Real-time zero-returning control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101256204B (en) | Current detecting device and calibration method | |
| CN1133878C (en) | Isofrequency measuring method for earth resistance and apparatus thereof | |
| CN202837406U (en) | DC power supply output impedance measuring device | |
| EP2056487A1 (en) | Testing device and method for determining a common mode signal of an electrical telecommunication | |
| CN103529268B (en) | A kind of alternating current bridge and impedance measurement method with auxiliary equilibrium function automatically | |
| CN107192445B (en) | Strong vibration sensor circuit for high-voltage circuit breaker and signal acquisition system | |
| CN111398662A (en) | Current sensor for power transmission line | |
| CN200989920Y (en) | Electric energy quality tester signal dispensable circuit | |
| CN210954315U (en) | High-low voltage electricity inspection comprehensive tester with primary current measurement | |
| CN203759090U (en) | Current sampling circuit of rail-transit traction data acquisition system | |
| CA3146140A1 (en) | Current sensors employing rogowski coils and methods of using same | |
| CN104020357A (en) | Capacitance test circuit and test method under DC bias condition | |
| CN202025069U (en) | Circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing auxiliary operational amplifier | |
| CN207399155U (en) | Signal filtering process Compare System based on analog-digital converter | |
| CN202735407U (en) | Active power filter harmonic detection device | |
| CN111338272A (en) | Differential multichannel high-voltage sampling circuit with second-order low-pass filtering | |
| CN212229025U (en) | Current sensor for power transmission line | |
| CN206594219U (en) | A kind of Acquisition Circuit and analogue integrator based on Rogowski coil transient characterisitics | |
| CN210514514U (en) | Small signal acquisition circuit applied to power distribution terminal | |
| CN210835177U (en) | Battery detection circuit | |
| CN111122170B (en) | High-precision resistance signal conditioning circuit and method based on current source | |
| CN209070012U (en) | It is a kind of for measuring the device of surge current | |
| CN111220837A (en) | Output voltage detector of broadband PWM frequency converter | |
| CN206876222U (en) | A kind of signal regulating device suitable for Hydropower Unit test equipment | |
| CN218068139U (en) | Power grid frequency detection circuit and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20071212 |
|
| EXPY | Termination of patent right or utility model |