CN201097248Y - Signal measuring device for current constant source - Google Patents
Signal measuring device for current constant source Download PDFInfo
- Publication number
- CN201097248Y CN201097248Y CNU2007200156710U2007200156710U CN200720015671U CN201097248Y CN 201097248 Y CN201097248 Y CN 201097248Y CN U2007200156710U2007200156710 U CNU2007200156710U2007200156710 U CN U2007200156710U2007200156710U CN 200720015671 U CN200720015671 U CN 200720015671U CN 201097248 Y CN201097248 Y CN 201097248Y
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- signal
- signal measurement
- measurement device
- resistance
- voltage
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Abstract
The utility model discloses a constant-current source signal measurement device which is characterized in that the signal measurement device comprises a finely selected operational amplifier and a precision resistor and has the function of voltage-current signal conversion with high precision and wide frequency range. The signal measurement device is capable of avoiding wave distortion and amplitude distortion within the frequency of 70kHz when square voltage signal is inputted, and avoiding wave distortion and amplitude distortion within the frequency of 200kHz when triangular voltage signal is inputted or when sine-wave voltage signal is inputted. The working temperature of the signal measurement device ranges from minus 25 DEG C to 70 DEG C. The signal measurement device is applicable in signal measurement of a vehicle towing converter, an auxiliary converter, as well as industry control field. Therefore the signal measurement device is of broad market prospect and great potential economic value.
Description
Technical field
The utility model relates to a kind of constant current source signal measurement apparatus, relates in particular to a kind of voltage-current converter circuit with high precision, wide frequency ranges.
Background technology
In Power Electronic Technique and automated control technology widespread use and flourish today, the fidelity and the anti-interference of precision that control signal is measured and signal transmission receive much concern always, it is good more that these problems solve, the degree of accuracy of control can be protected more, signal measurement can truly reflect the feature of original signal more, more helps original signal institute exposed problems is analyzed solution.Needing to convert voltage signal to current signal under many circumstances transmits.Considering that the original signal energy shortage is when being continuously the circuit supply of back or not disturbed by the back circuit and during distortion, original signal need be changed by active circuit.When measuring again after the longer Distance Transmission of primary voltage signal demand, just voltage signal need be changed into current signal.The advantage of current signal is exactly that anti-interference is good, and what most voltage sensors and current sensor were exported all is current signal.The device of using a most critical when carrying out the voltage and current signal conversion is exactly an operational amplifier.The performance of operational amplifier directly has influence on the waveform quality of output signal.Operational amplifier is the circuit form that is made of many elements and parts.What these elements and parts had itself is exactly reactance component, though what have is not in fact how much reactance component has reactive component.Because the existence of reactance can make amplifier present different amplifying powers for the different frequency of signal.Actual amplifier, its enlargement factor can only guarantee to have in a frequency range more equably and amplify.The common determination methods of analyzing according to electronic circuit, at the two ends of passband, enlargement factor is lower than 0.707 times of intermediate bands, and (frequency part in addition promptly-3dB), we can think and not be effective amplification.This has just limited the frequency range of voltage-current converter circuit, so when the applied voltage current converter circuit, indexs such as the response time that must meet the demands, the linearity and drift.
Summary of the invention
The purpose of this utility model is at the deficiencies in the prior art, develops a kind of novel high precision, the electric current and voltage conversion equipment of wide frequency ranges.Technical solution of the present utility model is achieved in that
A kind of constant current source signal measurement apparatus is characterized in that comprising by two operational amplifier IC1A and IC1B and contains resistance R
1R
2R
3R
4And R
5Peripheral circuit form, the positive input terminal of wherein said operational amplifier IC1A passes through resistance R
3Reception conversion input voltage signal passes through resistance R again
4Receive the output terminal of another one operational amplifier IC1B; The negative terminal of described amplifier IC1A is then by a resistance R
1Ground connection is passed through resistance R again
2Connect its output terminal; The output terminal of this amplifier is also by a resistance R
5Receive signal output part, be directly connected to the positive input terminal of another amplifier IC1B simultaneously by signal output part, its negative terminal is connected with its output terminal.
Compared with prior art, advantage of the present utility model is to have high precision, the voltage and current signal translation function of wider frequency range, is adapted to signal measurement and other industrial control fields of Locomotive Converter, AuCT.
Description of drawings
The utility model drawings attached one width of cloth, wherein:
Fig. 1 is an electrical block diagram of the present utility model.
In the drawings: 1, amplifier IC1A, 2, amplifier IC1B.
Embodiment
A kind of constant current source signal measurement apparatus as shown in Figure 1, its circuit floats precision resistance R by operational amplifier IC1A and IC1B and low temperature
1R
2R
3R
4And R
5Form, circuit structure is terse and function is directly perceived.At first select the operational amplifier of low reactance value, wide frequency ranges, repetition test is selected well behaved in this respect MC33078 chip after contrasting numerous operational amplifiers, and its operating temperature range is-40 ℃～+ 85 ℃.The operational amplifier peripheral circuit all adopts the purpose of resistance to make entire circuit have resistance characteristic exactly, reduce the influence of induction reactance and capacitive reactance as far as possible, thereby make input voltage signal and output current signal keep certain linear dependence, and do not have the distortion of waveform and the time-delay of phase place.Simultaneously should select low temperature to float resistance, make the current signal of output the distortion of waveform and the time-delay of phase place not take place because of variation of temperature, this circuit adopts be operating temperature range within-55 ℃～+ 85 ℃, precision is 1 ‰, power is 1/4W low temperature floats precision resistance, solved this problem well.On the resistance value coupling, under the condition of R1=R2 and R3=R4, guarantee Io=Ui/R5, choose reasonable R5 is no more than the maximum output current of amplifier to guarantee Io simultaneously.Find that by carry out emulation with Saber software output performance is very outstanding.From a large amount of emulation and test, hammer out best resistance value coupling, i.e. R1=R2=R3=R4=50k Ω, R5=250 Ω.
Cold test and this circuit of high and low temperature evidence have following characteristic:
1, waveform and amplitude can distortions within the 70kHz under the situation of input square wave voltage signal, and distortion is a triangular wave when 167kHz;
2, waveform and amplitude can distortions within 200kHz under the situation of input triangle wave voltage signal, and waveform can distortion within 200kHz～8MHz, amplitude distortion;
3, waveform and amplitude can distortions within 200kHz under the situation of input sine wave voltage signal, and distortion is a triangular wave when 200kHz, and amplitude begins distortion;
4, the operating temperature range that characteristic was fit to of above-mentioned three kinds of waveforms is-25 ℃～+ 70 ℃.Above-mentioned voltage-current converter circuit has been made the 3U signal processing circuit board of standard, and each signal processing circuit board has 18 current converter circuits.
Claims (1)
1, a kind of constant current source signal measurement apparatus is characterized in that comprising by two operational amplifier IC1A (1) and IC1B (2) and contains resistance R
1R
2R
3R
4And R
5Peripheral circuit form, the positive input terminal of wherein said operational amplifier IC1A passes through resistance R
3Reception conversion input voltage signal passes through resistance R again
4Receive the output terminal of another one operational amplifier IC1B; The negative terminal of described amplifier IC1A is then by a resistance R
1Ground connection is passed through resistance R again
2Connect its output terminal; The output terminal of this amplifier is also by a resistance R
5Receive signal output part, be directly connected to the positive input terminal of another amplifier IC1B simultaneously by signal output part, its negative terminal is connected with its output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200156710U2007200156710U CN201097248Y (en) | 2007-11-02 | 2007-11-02 | Signal measuring device for current constant source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200156710U2007200156710U CN201097248Y (en) | 2007-11-02 | 2007-11-02 | Signal measuring device for current constant source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201097248Y true CN201097248Y (en) | 2008-08-06 |
Family
ID=39924301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200156710U2007200156710U Expired - Fee Related CN201097248Y (en) | 2007-11-02 | 2007-11-02 | Signal measuring device for current constant source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201097248Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349927B (en) * | 2008-09-05 | 2010-06-09 | 哈尔滨工业大学 | V-I switch circuit and programmed control current source using the same |
-
2007
- 2007-11-02 CN CNU2007200156710U2007200156710U patent/CN201097248Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349927B (en) * | 2008-09-05 | 2010-06-09 | 哈尔滨工业大学 | V-I switch circuit and programmed control current source using the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NORTH CHINA CO. Free format text: FORMER OWNER: XIE BUMING Effective date: 20080912 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080912 Address after: Beijing City, Fengtai District Fong City Park District building 15, zip code: 100076 Patentee after: China CNR Corporation Limited Address before: R & D center of Dalian Locomotive & Rolling Stock Co., Ltd., No. 51 middle The Strip, Shahekou District, Liaoning, Dalian 116022, China Patentee before: Xie Buming |
|
| ASS | Succession or assignment of patent right |
Owner name: CHINA CNR CORPORATION LIMITED DALIAN ELECTRIC TRAC Free format text: FORMER OWNER: NORTH CHINA CO. Effective date: 20090410 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090410 Address after: No. 51, middle The Strip, Shahekou District, Liaoning, Dalian Province, China: 116022 Patentee after: Dalian Electric Traction Research & Development Center of China North Locomotive Co., Ltd. Address before: Beijing City, Fengtai District Fong City Park District building 15, zip code: 100076 Patentee before: China CNR Corporation Limited |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20111102 |