CN203241084U - Vortex street flow converter based on application-specific integrated circuit - Google Patents
Vortex street flow converter based on application-specific integrated circuit Download PDFInfo
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- CN203241084U CN203241084U CN 201320234370 CN201320234370U CN203241084U CN 203241084 U CN203241084 U CN 203241084U CN 201320234370 CN201320234370 CN 201320234370 CN 201320234370 U CN201320234370 U CN 201320234370U CN 203241084 U CN203241084 U CN 203241084U
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Abstract
The utility model provides a vortex street flow converter based on an application-specific integrated circuit. The vortex street flow converter based on the application-specific integrated circuit is small in size, high in signal to noise ratio, good in antiknock performance, and capable of achieving precision measurement on small signals, and comprises a piezoelectric sensor, a central processing unit, a display unit, a data storage unit, an input unit, an output unit and a communication unit, wherein the display unit, the data storage unit, the input unit, the output unit and the communication unit are respectively connected with the central processing unit. The vortex street flow converter is characterized by further comprising a detection chip, wherein the detection chip is respectively connected with the piezoelectric sensor and the central processing unit, the detection chip is used for amplifying, rectifying and filtering electric charge signals output by the piezoelectric sensor, and then outputting a square signal, and the size of the square signal is smaller than 1 square centimeter. Due to an automatic gain voltage amplification circuit integrated in the detection chip, the automatic gains of the voltage are achieved, the original process operated by a dial-up plate is greatly simplified, inaccurate measurement caused by human factors is removed, in addition, the arrangement can be carried out on the gains through the central processing unit, and more operational choices can be provided.
Description
Technical field
The utility model belongs to the flow measurement technology field, relates in particular to a kind of flux of vortex street converter.
Background technology
Vortex shedding flow meter utilizes fluid oscillation principle measuring flow, when fluid is walked around its inner bluff body, forms well-regulated toll bar vortex row in the rear end, and in certain reynolds number range, the frequency of vortex row is directly proportional with flow velocity.The piezoelectric type vortex street is the most widely type of present rig-site utilization because technique is simple, with low cost.
Flow signal converts electric signal to through the piezoelectric detection element testing, carries out calculating and the processing of signal through the MCU that transfers to flowmeter behind electric charge amplification, voltage amplification, the filter shape.Because the medium of flowmeter survey is different with bore, has caused the flow range of different flow meter that very big-difference is arranged, the initial flow signal that has finally caused piezoelectric sensor to transform out has very large difference at range of signal and signal intensity.Tradition vortex street amplifying circuit is adjusted measurement range and the sensitivity of metering circuit by toggle switch.This kind mode one is to cause the converter inside volume large, is difficult for miniaturization; The 2nd, sensitivity and enlargement factor all need manual adjustments, and complicated operation needs the operator to have certain use experience.Simultaneously traditional flux of vortex street converter is in the processing of signal, uses single-ended amplifier to carry out signal the differential signal of vortex street and processes, can't effectively suppress common-mode noise, causes the flowmeter signal to noise ratio (S/N ratio) low and shock resistance is poor.In addition, because the amplifying circuit of traditional flux of vortex street converter generally adopts General operational amplifier to build circuit, cause the output impedance of whole amplifying circuit not high, can't realize the accurate measurement of small-signal.
For problems, Japanese Yokogawa company has also designed the special IC that is used for spectrum analysis and bandpass filtering, and the patent No. is US6480812B1.But this mode must be based on the CPU algorithm, and design is complicated, and cost is very high, is not suitable with and promotes the use of at home.Chinese patent 99101209.7 also discloses a kind of digital signal processing system of vortex street flowmeter; be comprised of DPS chip and logic control circuit part, forward direction input channel part, 4-20mA transmitter output, LED display part, key input section, serial communication interface part, holding circuit part and corresponding software: it is characterized in that DPS chip and logic control circuit part link to each other with other parts in the system, formation is carried out the system of digital signal processing to the output signal of the sensor of vortex shedding flow meter.This system has the narrow-band filtering function, has improved the anti-interference of instrument, realize Small flowrate measurement, range extension ratio, but effect is not very desirable.
Summary of the invention
In order to solve the problems of the technologies described above, the utility model provides a kind of volume little, signal to noise ratio (S/N ratio) is high, shock resistance is good, can realize the accurate flux of vortex street converter based on special IC of measuring of small-signal, comprise piezoelectric sensor, central processing unit, display unit, data storage cell, input block, output unit and communication unit, described central processing unit respectively with described display unit, data storage cell, input block, output unit is connected with communication unit, characterized by further comprising detection chip, described detection chip is connected with central processing unit with described piezoelectric sensor respectively, described detection chip is used for the charge signal of piezoelectric sensor output is amplified, shaping, after the filtering, the output square-wave signal, its size is less than 1cm
2
Described detection chip comprises fully differential electric charge amplification low pass circuit, automatic gain voltage amplifier circuit, low-pass filter circuit able to programme and the comparator circuit that connects successively.
The beneficial effects of the utility model are: added being specifically designed to the detection chip of processing charge signal, detection chip adopts the encapsulation of SQPF-48 0.5mm size, and entire area is less than 1cm
2, compare with traditional dial-up plate, greatly dwindled the instrument size, be conducive to assembling and instrument miniaturization; The use of detection chip, so that piezoelectric sensor small charge signal out all is to amplify processing in detection chip inside, comparing traditional pcb board level signal processes, its anti-interference improves greatly, simultaneously reduce greatly pcb board level peripheral components, reduced circuit board under the complex industrial site environment, to the coupling of various electromagnetic noises, improve the signal to noise ratio (S/N ratio) of circuit integral body, expanded the flux lower limit that vortex flow meter can detect; Detection chip has reduced the debugging of later stage to different bore vortex train flow meters to the Intelligent treatment of piezoelectric sensor signal; Detection chip is used integrated circuit, other output impedance of traditional measurement circuit M Ω level can be promoted to G Ω, has greatly improved the sensitivity of charge measurement, has promoted the measurement lower limit precision; Use fully differential electric charge amplification low pass circuit in detection chip, use the fully differential structure to carry out circuit design, replaced original single-ended input fully, the establishment common mode interference has reduced the measurement lower limit of instrument, has expanded greatly the range ratio of instrument; By automatic gain voltage amplifier circuit integrated in the detection chip, realize the automatic gain of voltage, greatly simplify original process by the operation of dial-up plate, get rid of the measurement inaccuracy that factor is brought artificially is set, can further lead to central processing unit in addition gain is arranged, provide more multioperation to select.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is detection chip schematic diagram of the present utility model;
Fig. 3 is the encapsulation synoptic diagram of detection chip of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further:
Among the figure, 1, piezoelectric sensor; 2, central processing unit; 3, display unit; 4, data storage cell; 5, input block; 6, output unit; 7, communication unit; 8, fully differential electric charge amplification low pass circuit; 9, automatic gain voltage amplifier circuit; 10, low-pass filter circuit able to programme; 11, comparator circuit.
Such as Fig. 1, Fig. 2, shown in Figure 3, central processing unit 2 is connected with communication unit with display unit 3, data storage cell 4, input block 5, output unit 6 respectively and is connected, detection chip is connected with central processing unit with piezoelectric sensor 1 respectively and is connected, detection chip is used for after the charge signal amplification of piezoelectric sensor 1 output, shaping, the filtering, the output square-wave signal, its size is less than 1cm
2, detection chip comprises fully differential electric charge amplification low pass circuit 8, automatic gain voltage amplifier circuit 9, low-pass filter circuit able to programme 10 and the comparator circuit 11 that connects successively.
During use, the differential signal that piezoelectric sensor 1 detects is through the outer electric capacity of sheet, the input detection chip, the detection chip first order is fully differential electric charge amplification low pass circuit 8, the signal that imports into is carried out electric charge to be amplified, low-pass filtering and the processing that reduces low frequency noise, be positioned at the automatic gain voltage amplifier circuit 9 of the second level, the signal of millivolt level is zoomed into the signal of volt one-level, be convenient to the further processing of back, behind the second level, just amplify and a pair of more regular differential signal, the third level is low-pass filter circuit 10 able to programme, further signal is carried out filtering and shaping, signal is through behind the comparator circuit 11 of the fourth stage, become square-wave signal, to central processing unit 2 outputs, central processing unit 2 utilizes signal to calculate.
More than have been described in detail of the present utility model by embodiment, but described content only is preferred embodiment of the present utility model, can not be considered to be used to limiting practical range of the present utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the present utility model.
Claims (2)
1. flux of vortex street converter based on special IC, comprise piezoelectric sensor (1), central processing unit (2), display unit (3), data storage cell (4), input block (5), output unit (6) and communication unit (7), described central processing unit (2) respectively with described display unit (3), data storage cell (4), input block (5), output unit (6) is connected 7 with communication unit) connect, characterized by further comprising detection chip, described detection chip is connected 2 with described piezoelectric sensor (1) with central processing unit respectively) be connected, described detection chip is used for the charge signal of piezoelectric sensor (1) output is amplified, shaping, after the filtering, the output square-wave signal, its size is less than 1cm
2
2. a kind of flux of vortex street converter based on special IC as claimed in claim 1 is characterized in that described detection chip comprises fully differential electric charge amplification low pass circuit (8), automatic gain voltage amplifier circuit (9), low-pass filter circuit able to programme (10) and the comparator circuit (11) that connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320234370 CN203241084U (en) | 2013-05-03 | 2013-05-03 | Vortex street flow converter based on application-specific integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320234370 CN203241084U (en) | 2013-05-03 | 2013-05-03 | Vortex street flow converter based on application-specific integrated circuit |
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| Publication Number | Publication Date |
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| CN203241084U true CN203241084U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320234370 Expired - Fee Related CN203241084U (en) | 2013-05-03 | 2013-05-03 | Vortex street flow converter based on application-specific integrated circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444824A (en) * | 2015-11-26 | 2016-03-30 | 成都聚汇才科技有限公司 | Intelligent electronic water meter control system based on three-terminal signal amplification circuit |
| CN105486372A (en) * | 2015-11-26 | 2016-04-13 | 成都聚汇才科技有限公司 | Intelligent electronic water meter control system based on drive logic gate protection circuit |
| CN105509820A (en) * | 2015-11-26 | 2016-04-20 | 成都聚汇才科技有限公司 | Intelligent electronic meter control system based on trilinear buffer driving circuit |
| CN105509821A (en) * | 2015-11-26 | 2016-04-20 | 成都聚汇才科技有限公司 | Intelligent electronic water meter control system based on voltage-stabilization type logic gate protection circuit |
-
2013
- 2013-05-03 CN CN 201320234370 patent/CN203241084U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444824A (en) * | 2015-11-26 | 2016-03-30 | 成都聚汇才科技有限公司 | Intelligent electronic water meter control system based on three-terminal signal amplification circuit |
| CN105486372A (en) * | 2015-11-26 | 2016-04-13 | 成都聚汇才科技有限公司 | Intelligent electronic water meter control system based on drive logic gate protection circuit |
| CN105509820A (en) * | 2015-11-26 | 2016-04-20 | 成都聚汇才科技有限公司 | Intelligent electronic meter control system based on trilinear buffer driving circuit |
| CN105509821A (en) * | 2015-11-26 | 2016-04-20 | 成都聚汇才科技有限公司 | Intelligent electronic water meter control system based on voltage-stabilization type logic gate protection circuit |
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| 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: 20131016 Termination date: 20150503 |
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| EXPY | Termination of patent right or utility model |