CN205665382U - Enlarged circuit that draws of difference mode signal - Google Patents
Enlarged circuit that draws of difference mode signal Download PDFInfo
- Publication number
- CN205665382U CN205665382U CN201620370489.6U CN201620370489U CN205665382U CN 205665382 U CN205665382 U CN 205665382U CN 201620370489 U CN201620370489 U CN 201620370489U CN 205665382 U CN205665382 U CN 205665382U
- Authority
- CN
- China
- Prior art keywords
- signal
- voltage
- circuit
- stabilivolt
- amplifier
- 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 - Fee Related
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides the utility model discloses a carry out measuring enlarged circuit that draws of difference mode signal to the electrical power generating system electric quantity. Under the measurement condition that meets high common mode small -signal, for satisfying the requirement of high accuracy current measurement, through locate to implement the differential mode weight that the enlarged mode of near -end increases the signal to double -terminal signal at the sampling point, acquire high common mode small -signal, reach the requirement of precision measurement, the auxiliary electrical power source that this design comprises the stabilivolt, OP07 operational amplifier, divider resistance, the input feedback resistance constitute, the stabilivolt realizes as auxiliary electrical power source that the near -end enlargies, can the very wide sample voltage of adaptation, it puts the temperature and floats with to lack of proper care influence and the consumption brought little to adopt the operation of OP07 type can reduce fortune, carry out 12 partial pressures through 4 resistance R to sampled signal and handle the common mode weight that reduces the signal, the method that a high voltage difference mode signal near -end drawed is provided in this design, overcome high -end sampling and acquire the little signal measurement's of high common mode a difficult problem, the high precision measurement of electric current has been realized.
Description
Technical field
This utility model is applied in AEROSPACE APPLICATION field, especially at the aspect of monitoring power-supply system electricity.Enter at needs
During the monitoring of row electricity, owing to current sensor output not only containing differential-mode component but also contain the impact of common mode component, at electricity
The common-mode voltage range of flow sensor is higher than amplifier ability to bear, it is impossible in the case of being sent directly into amplifier process, originally set
Meter reduces the common mode component of signal, substantially increases the precision of current detecting.
Background technology
Along with the fast development of science and technology, more and more higher, especially to the dependence of electronic equipment in the various aspects of society
In some high-tech areas, then the detection of electronic device works state be it is also proposed and more carry out high requirement.
In order to enable to be monitored the service condition of power-supply system electricity more accurately, the measurement to current value in recent years is entered
Having gone substantial amounts of research, the environment however as power system structure and application gets more and more, and becomes increasingly complex, and it is measured and pipe
Reason difficulty is the most increasing, and most important is exactly the measurement of monomer electric current, owing to the common-mode signal of monomer both ends of power is far above
Difference mode signal, when higher than amplifier ability to bear when, can make to accurately measure the extremely difficult of change, greatly reduce electricity
The monitoring accuracy of origin system electricity, it will have a strong impact on the estimation to dump energy, and shorten the service life of power-supply system.
Summary of the invention
This utility model, in order to overcome the problem of above-mentioned existence, gives the side that a high voltage difference mode signal near-end extracts
Method, in the case of the measurement running into high common mode small-signal, for meeting high-precision current measurement requirement, by sample point to double
End signal is implemented the mode that near-end amplifies and is increased the differential-mode component of signal, obtains high common mode small-signal, reaches accurately to measure
Requirement, overcomes high-end sampling to obtain a difficult problem for high common mode weak-signal measurement, it is achieved that the high-acruracy survey of electric current.
This utility model be the technical scheme is that by problem in the above-mentioned life of solution
This utility model is that the difference mode signal measuring power-supply system electricity amplifies extraction circuit, including stabilivolt structure
The accessory power supply become, OP07 operational amplifier, divider resistance, the element such as input feedback resistance.Its structure mainly include main circuit,
Resistor voltage divider circuit and three parts of signal amplification circuit, main circuit is made up of power supply, sampling resistor, load, stabilivolt, dividing potential drop
Circuit carries out 1/2 dividing potential drop by 4 resistance R to sampled signal, the signal amplification circuit OP07 by the asymmetric work of dual power supply
Amplifier carries out signal amplification.
This utility model uses such scheme, reasonable in design, advantage one, overcomes high-end sampling to obtain by bleeder circuit
Take a difficult problem for high common mode weak-signal measurement, it is achieved that the high-acruracy survey of electric current；Advantage two, by stabilivolt as accessory power supply
Realize near-end to amplify, it is to avoid weak-signal measurement is disturbed effect of noise；Advantage three, by this differential amplifier circuit place
Reason, carrying out current detecting when, it is possible to the common-mode voltage range born more is widened；Advantage four, structure is relatively easy, reduces
Cost makes the measurement more convenient simultaneously.
After tested, common mode electricity under the measurement relative error of the different current values under the most same voltage or same electric current
Relative error produced by buckling, both of which is smaller.
This circuit can successfully extract the differential mode amount of signal, and the common-mode voltage range that circuit can bear simultaneously is relatively wide.
Accompanying drawing illustrates:
Fig. 1 is this utility model structure chart;
Fig. 2 is the schematic diagram of this utility model differential amplifier circuit, and 1 is main circuit, and 2 is resistor voltage divider circuit, and 3 is signal
Amplifying circuit.
Detailed description of the invention:
For the technical characterstic of this programme can be clearly described, below by detailed description of the invention, and combine its accompanying drawing, to this reality
It is described in detail with novel.
This utility model is that the difference mode signal measuring power-supply system electricity amplifies extraction circuit, including stabilivolt structure
The accessory power supply become, OP07 operational amplifier, divider resistance, the element such as input feedback resistance.Its structure mainly include main circuit,
Resistor voltage divider circuit and three parts of signal amplification circuit, main circuit is made up of power supply, sampling resistor, load, stabilivolt, dividing potential drop
Circuit carries out 1/2 dividing potential drop by 4 resistance R to sampled signal, the signal amplification circuit OP07 by the asymmetric work of dual power supply
Amplifier carries out signal amplification.
Main circuit, is reconnected carrying ground by power sources in series sampling resistor and forms, and two stabilivolts are cascaded A point
With G0 point point-to-point transmission voltage clamp at 12V, and saying amplifier, its virtual earth voltage is A point and the meansigma methods of G0 point voltage.
Resistor voltage divider circuit, introduces the method that bridge resistance voltage division processing removes common mode, and first bleeder circuit passes through R3And R4
Series connection, R1And R2Series connection connects sampling resistor R the most respectivelysTwo ends, wherein defeated compared with differential amplifier circuit of sampled signal equivalent internal resistance
Enter impedance to be negligible, i.e. (R1 + R2 )// ( R3 + R4 ) much smaller than Rs, so bleeder circuit one termination power is just
Pole, the other end passes through resistance RsConnect power supply negative terminal, sampled signal RsBoth end voltage i.e. Vb-Va, to RsSampled signal, it is impossible to directly
Send in amplifier, otherwise can be equal because of the input voltage of amplifier and positive voltage, amplifier enters saturation distortion region, logical
Cross 4 resistance R1、R2And R3、R4Sampled signal is carried out 1/2 voltage division processing to reduce the common mode component of signal, take 1/2 dividing potential drop
It is because so selecting similar resistive element to reduce the impact that drift is brought, voltage VaPass through R1And R2Dividing potential drop, obtains G2
Point voltage passes through input resistance R5Send into OP07 amplifier positive input, voltage VbPass through R3And R4Dividing potential drop, obtains G1 point voltage
By feedback resistance R6Connect OP07 reverse input end, arrive V by followerd, i.e. Vd=VG2。
Signal amplification circuit, selects OP07 operational amplifier, and it can reduce the drift of amplifier temperature and the impact brought of lacking of proper care,
From the point of view of virtual earth G2, G1 point current potential is negative, and after the amplifier that gain is G, output voltage is on the occasion of (VG2 -VG1)*
G, and the voltage follower carrying out impedance isolation is output as zero, so there being Vc-Vd=(VG2 -VG1)*G =I*Rs*G/2, has built
Circuit, from sampling end extract difference mode signal Va-VbIn the range of 0 ~ 50mV, after this differential mode extracts circuit, difference mode signal
Vc-VdScope increases to 0 ~ 400mV, although common mode component fall is little (only 6V), but its differential mode significantly carries
Gao Liao, after tested, common-mode voltage under the measurement relative error of the different current values under the most same voltage or same electric current
The produced relative error of change, both of which is smaller.
This circuit can successfully extract the differential mode amount of signal, and the common-mode voltage range that circuit can bear simultaneously is relatively wide.
For the technical characterstic of this programme can be clearly described, below by detailed description of the invention, and combine its accompanying drawing, to this reality
It is described in detail with novel.
This utility model does not describes part in detail, is the known technology of those skilled in the art of the present technique.
Claims (1)
1. one kind is amplified extraction circuit for the difference mode signal measuring power-supply system electricity, it is characterised in that: described electricity
Road mainly includes main circuit, resistor voltage divider circuit and three parts of signal amplification circuit；Described main circuit by positive source with adopt
Sample resistant series connects, RsThe other end be connected with load in series, the load other end and power cathode and be connected, two voltage stabilizings
Pipe VD1, VD2 are connected in series in A point and G0 point；Described resistor voltage divider circuit introduce bridge resistance dividing potential drop in order to remove common-mode signal,
Bleeder circuit passes through R3And R4Series connection, R1And R2Series connection connects sampling resistor R the most respectivelysTwo ends, by 4 resistance R1、R2And R3、
R4Sampled signal is carried out 1/2 voltage division processing, voltage VaPass through R1And R2Dividing potential drop, obtains G2 point voltage by input resistance R5Send into
OP07 amplifier inverting input, voltage VbPass through R3And R4Dividing potential drop, obtains G1 point voltage by feedback resistance R6Just connect OP07
To input；Described signal amplification circuit, selects OP07 operational amplifier, amplifies through the amplifier that gain is G, and G2 connects respectively
Connecing the reverse input end of OP07 amplifier and the reverse input end of follower, G1 point connects the positive input of Amplifier OP07,
Stabilivolt VD1 is connected in series with stabilivolt VD2, and stabilivolt VD1 is connected with the positive pole of power supply and the VCC pin of OP07, stabilivolt
The VEE pin of VD2 with R8 and OP07 is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620370489.6U CN205665382U (en) | 2016-04-28 | 2016-04-28 | Enlarged circuit that draws of difference mode signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620370489.6U CN205665382U (en) | 2016-04-28 | 2016-04-28 | Enlarged circuit that draws of difference mode signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205665382U true CN205665382U (en) | 2016-10-26 |
Family
ID=57164153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620370489.6U Expired - Fee Related CN205665382U (en) | 2016-04-28 | 2016-04-28 | Enlarged circuit that draws of difference mode signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205665382U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106645908A (en) * | 2016-12-08 | 2017-05-10 | 中国北方发动机研究所(天津) | High common mode small signal acquisition method and acquisition circuit |
| CN106771536A (en) * | 2016-12-19 | 2017-05-31 | 广东威创视讯科技股份有限公司 | A kind of system dc voltage monitoring equipment |
| CN111654784A (en) * | 2020-04-29 | 2020-09-11 | 柏建民 | Direct-selection amplification universal circuit scheme for weak signals in complex signal environment and implementation method |
-
2016
- 2016-04-28 CN CN201620370489.6U patent/CN205665382U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106645908A (en) * | 2016-12-08 | 2017-05-10 | 中国北方发动机研究所(天津) | High common mode small signal acquisition method and acquisition circuit |
| CN106645908B (en) * | 2016-12-08 | 2019-04-05 | 中国北方发动机研究所(天津) | A kind of acquisition method and Acquisition Circuit of the small signal of high common mode |
| CN106771536A (en) * | 2016-12-19 | 2017-05-31 | 广东威创视讯科技股份有限公司 | A kind of system dc voltage monitoring equipment |
| CN111654784A (en) * | 2020-04-29 | 2020-09-11 | 柏建民 | Direct-selection amplification universal circuit scheme for weak signals in complex signal environment and implementation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205665382U (en) | Enlarged circuit that draws of difference mode signal | |
| CN102033212B (en) | Magnetic sensor circuit | |
| CN106443128B (en) | A kind of femto-ampere grade low current signal measuring circuit | |
| CN106989847A (en) | Error correcting method in system of Pt-resistance | |
| CN106501573A (en) | A kind of difference mode signal amplifies extraction circuit | |
| CN104007400A (en) | Magnetic sensor device | |
| CN102879648B (en) | Thin film resistive gas sensor changes in resistance pick-up unit | |
| CN108169568A (en) | Milliohm resistance measuring circuit | |
| CN206573227U (en) | REAL-TIME SELF thermocouple temperature measurement circuit | |
| CN108709646A (en) | A kind of temperature detection sample circuit | |
| CN106601818B (en) | The detection method of current detection circuit | |
| CN214041538U (en) | Current and voltage detection circuit based on single chip microcomputer | |
| CN106840441A (en) | Multi-channel temperature measurement device and method | |
| CN103837811B (en) | Transistor curve tracer high-resolution test device | |
| CN101629800B (en) | Measurement circuit for eliminating temperature drift | |
| CN205484500U (en) | Portable current measurement circuit that declines | |
| CN206339316U (en) | Multi-channel temperature measurement device | |
| CN100529675C (en) | Double passage differential anti-jamming current amplification circuit | |
| CN102288318A (en) | Temperature detection circuit of permanent magnet synchronous motor and controller system for electric vehicle | |
| CN108983065A (en) | A kind of voltage amplifier circuit, detection circuit and its circuit detecting method | |
| CN106357264A (en) | Small signal amplifying measurement circuit | |
| CN203909242U (en) | Copper metal steam concentration detection system based on micrometer scale sensor | |
| CN105548666A (en) | Electric automobile charging current calculation method free from sampling resistor | |
| CN100570379C (en) | The method of a resistance and converter in the digital multi-purpose meter on-line measurement for loop | |
| CN207395917U (en) | A kind of high-precision PT100 temperature sensing circuits |
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 |
Granted publication date: 20161026 Termination date: 20170428 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |