CN2243064Y - Non-linear compensation modulation-demodulation amplifier - Google Patents
Non-linear compensation modulation-demodulation amplifier Download PDFInfo
- Publication number
- CN2243064Y CN2243064Y CN 95230457 CN95230457U CN2243064Y CN 2243064 Y CN2243064 Y CN 2243064Y CN 95230457 CN95230457 CN 95230457 CN 95230457 U CN95230457 U CN 95230457U CN 2243064 Y CN2243064 Y CN 2243064Y
- Authority
- CN
- China
- Prior art keywords
- modulation
- signal
- demodulation
- direct current
- output
- 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
- 238000006073 displacement reaction Methods 0.000 abstract description 13
- 230000003321 amplification Effects 0.000 abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model belongs to a modulation-demodulation amplifier used for a sensor. A differential transformer type displacement sensor LVDT is connected with a modulation-demodulation device; a displacement signal is output to an A/D converter IC< 6 > via adjusting amplifying circuits IC< 4 >, IC< 5 >, and the displacement signal is input into a D/A converter IC< 8 > via a memory IC< 7 >; a compensation signal is fed back to an arithmetic device (an adder) IC< 2 > via regulating circuits IC< 9 >, IC< 10 >; a direct current standard signal source, which is compensated by nonlinear compensation, is output via final stage amplification, and the direct current standard signal source is for the working of a servo valve so as to complete the position closed loop control of a hydraulic control system. The utility model has the characteristics of high precision, good sensitivity, high reliability, etc., and is suitable for the matched use of a displacement sensor used for an FT911G rolling mill.
Description
The utility model belongs to the sensor modulation-demodulation amplifier, particularly a kind of nonlinear compensation modulation-demodulation amplifier that is used for differential transformer displace.
The modulator-demodular unit amplifying circuit that is widely used in differential transformer displace at present is received as displacement signal with transducer LVDT, is converted to the output of standard direct current signal through modulation-demodulation amplifier, thereby finishes control and measurement to displacement signal.But owing to the precision of the transducer LVDT that utilizes the differential transformer principle to make can't guarantee to accomplish very high on technology, be generally 0.1-0.5%, and the modulation amplifying circuit can not carry out nonlinear compensation to the error that LVDT produces, and therefore can not satisfy sensor high-acruracy survey and control requirement.
The purpose of this utility model is to overcome above technical deficiency, and the differential transformer displace nonlinear compensation modulation-demodulation amplifier of a kind of measuring accuracy height, good reliability, strong interference immunity is provided.
Task of the present utility model is, displacement signal with differential transformer displace LVDT reception, AD598 modulation in the modulation amplifying circuit, demodulation, filtering, amplify, error signal in the direct current standard signal of output is through amplifying, analog to digital conversion, storer, digital-to-analog conversion, adjusting gear carries out nonlinear error compensation, and with the modulation of compensating signal and AD598, demodulation, filtering, amplify back output direct current standard signal, after arithmetic unit (totalizer) computing, export through output amplifier, one through the direct current standard signal after the nonlinear compensation, feeds back to control system.The non-linear modulation demodulator amplifier is through modulation, demodulation, filtering, amplification, nonlinear compensation, and precision is 0.02-0.05%, control requirements such as strong anti-interference performance, realization high-acruracy survey.
Specify with by way of example below in conjunction with accompanying drawing.
Fig. 1 shows non-linear modulation demodulator amplifier block diagram.
Fig. 2 shows non-linear modulation demodulator amplifier schematic diagram.
Among Fig. 1, differential transformer displace LVDT signal is received to special IC AD598 demodulation, filtering, amplification input summer, export A/D converter to through the adjustment amplification and be converted to digital and analogue signals in primary memory, input summer after D/A is converted to the simulating signal adjustment is through the direct current standard signal source of output amplifier output through nonlinear compensation.
With reference to Fig. 2, the AD598 special IC provides differential transformer displace LVDT excitation can adjust with amplitude, frequency is the sine voltage of 3KHZ, and with LVDT secondary output demodulation, filtering be enlarged into one with the proportional standard direct current signal (5V-+5V) TJ of LVDT iron core displacement
2The point.This signal is through IC
2(IC
2Play the phase inverter effect here) will (5V-+5V) signal transition be (+5V--5V) signal TJ
3Through IC
4, IC
5Adjust, be enlarged into the 0-5V simulating signal, through IC
6A/D converter is converted to digital signal to memory IC
7In, and store each measurement point error and utilize computer technology to deposit error compensation quantity in memory IC
7In, give D/A converter IC
8Transfer error compensating signal to simulating signal through IC
9, IC
10Send into totalizer IC after the adjustment
2Input end, and with LVDT after the direct current standard signal of AD598 output is carried out computing (after being nonlinear compensation) through output amplifier IC
3The direct current standard signal of output one process nonlinear compensation is to TJ
4The point.
The nonlinear compensation modulation-demodulation amplifier is applied to the hydraulic control system of rolling mill, with LVDT and the same hydraulic cylinder synchronous of hydraulic cylinder rigid attachment, produce relative displacement during hydraulic cylinder works, this displacement is the displacement of LVDT iron core, this signal is fetched after the AD598 modulation through LVDT, demodulation, filtering, be enlarged into one in the proportional direct current standard signal of LVDT iron core displacement, this signal is through the nonlinear compensation in the amplifying circuit, modulation output one is through the direct current standard signal of nonlinear compensation, for servo-valve work, the servo-valve controlled hydraulic system changes cylinder pressure (position), the position closed loop control in the hydraulic control system is finished in hydraulic cylinder promotion roll work (position), guarantees the rolled plate thickness deviation.
Improved the rolled products precision, satisfied in the milling train closed-loop control system requirement the high-acruracy survey element.
Nonlinear compensation modulation-demodulation amplifier technical parameter
1. power supply ± 15V 2. environment temperature 0-45 ℃
3. precision (comprising LVDT) 0.05%, 0.03%, 0.02% (fs)
4. common-mode rejection ratio＞100db 5. frequency response 0-150HZ/S
6. float≤5mv/24h (10V output) time
Temperature float≤± 0.005%/℃
8. ripple≤2mv (P-P)
9. output amplitude ± 5V, ± 10V, 0-5V, 0-10V
Nonlinear compensation modulator-demodular unit amplifier, the key technical indexes demodulation accuracy all improve 1 order of magnitude than plain edition modulation-demodulation amplifier, and temperature is floated, the time float, technical indicator such as frequency response also is better than plain edition.Have characteristics such as precision height, sensitivity are good, good reliability, be applicable to the supporting use of FT911G series rolling mill dedicated bit displacement sensor.
Claims (1)
1, a kind of nonlinear compensation modulation-demodulation amplifier, LVDT connects modulation-demodulation device by differential transformer displace, it is characterized in that also comprising through adjusting amplifying circuit IC
4, IC
5, export A/D converter IC to
6, through memory IC
7, input to D/A converter IC
8, through adjusting IC circuit
9, IC
10Compensating signal is fed back to arithmetic unit (totalizer) IC
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95230457 CN2243064Y (en) | 1995-03-08 | 1995-03-08 | Non-linear compensation modulation-demodulation amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95230457 CN2243064Y (en) | 1995-03-08 | 1995-03-08 | Non-linear compensation modulation-demodulation amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2243064Y true CN2243064Y (en) | 1996-12-18 |
Family
ID=33875296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95230457 Expired - Fee Related CN2243064Y (en) | 1995-03-08 | 1995-03-08 | Non-linear compensation modulation-demodulation amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2243064Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012209A (en) * | 2010-09-29 | 2011-04-13 | 北京京海泉传感科技有限公司 | Digital transmission demodulating method of differential transformer displacement transducer |
-
1995
- 1995-03-08 CN CN 95230457 patent/CN2243064Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012209A (en) * | 2010-09-29 | 2011-04-13 | 北京京海泉传感科技有限公司 | Digital transmission demodulating method of differential transformer displacement transducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |