CN204214489U - A kind of bucking-out system of ultrasonic flow meter peakvalue's checking - Google Patents
A kind of bucking-out system of ultrasonic flow meter peakvalue's checking Download PDFInfo
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- CN204214489U CN204214489U CN201420711565.6U CN201420711565U CN204214489U CN 204214489 U CN204214489 U CN 204214489U CN 201420711565 U CN201420711565 U CN 201420711565U CN 204214489 U CN204214489 U CN 204214489U
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- diode
- electronic switch
- connects
- mcu module
- bucking
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Abstract
The utility model discloses a kind of ultrasonic flow meter peakvalue's checking bucking-out system, can diode drop in dynamic compensation peak-detector circuit, accurate ultrasonic signal peak value can be measured, thus the bucking-out system of ultrasonic flow meter accurate operational process can be applied to.S1 one end, ultrasonic signal source ground connection, the Chang Kaiduan of the other end and electronic switch U2 is connected, the normally closed termination reference voltage V of electronic switch U2
+the common port of electronic switch U2 connects with diode D1 positive pole, the control end of electronic switch U2 connects with the control output end of MCU module U1, the negative pole of diode D1 connects with the input end of electric capacity C1 one end, resistance R1 one end and AD conversion module U3 respectively, electric capacity C1 other end ground connection, the resistance R1 other end connects with the positive pole of diode D2, and the negative pole of diode D2 and the I/O port of MCU module U1 are connected, and the output terminal of AD conversion module U3 and the input end of MCU module U1 are connected.This system architecture is simple, practical.
Description
Technical field
The utility model relates to ultrasonic flow rate measurement amount field, particularly relates to a kind of bucking-out system of ultrasonic flow meter peakvalue's checking.
Background technology
Ultrasonic flow meter is the flowmeter that the time difference propagated in a fluid by ultrasonic signal or frequency-splitting carry out measuring flow, its most important part is exactly process to ultrasonic signal and measurement, and the peakvalue's checking of ultrasonic signal a kind of metering system that to be ultrasonic signal process conventional.At present, for the peakvalue's checking of ultrasonic signal, mostly use simple peak detection circuit, namely utilize the one-way conduction characteristic of diode, utilize the peak value of capacitance stores ultrasonic signal, then measure the peak value of magnitude of voltage as ultrasonic signal of capacitance stores.This method has obvious deficiency: 1. diode is when one-way conduction, there is forward conduction voltage drop, so the magnitude of voltage of capacitance stores differs the forward conduction voltage drop of diode with the true peaks of ultrasonic signal; 2. diode due to model, batch difference, forward conduction voltage drop is also not quite similar, and when temperature changes, and the one-way conduction pressure drop of diode exists serious temperature drift.So this simple method for measuring, the ultrasound wave peak value recorded is a coarse value, only can be used for rough computing.
Utility model content
The utility model be in order to provide a kind of can diode drop in dynamic compensation peak-detector circuit, accurate ultrasonic signal peak value can be measured, thus the bucking-out system of the ultrasonic flow meter peakvalue's checking of ultrasonic flow meter accurate operational process can be applied to.
The technical scheme adopted for realizing the purpose of this utility model is:
A kind of bucking-out system of ultrasonic flow meter peakvalue's checking, comprise MCU module U1, diode D1, electronic switch U2, electric capacity C1, diode D2, resistance R1 and AD conversion module U3, S1 one end, ultrasonic signal source ground connection, the Chang Kaiduan of the other end and described electronic switch U2 is connected, the normally closed termination reference voltage V of described electronic switch U2
+, the common port of described electronic switch U2 connects with described diode D1 positive pole, the control end of described electronic switch U2 connects with the control output end of described MCU module U1, the negative pole of described diode D1 respectively with described electric capacity C1 one end, the input end of described resistance R1 one end and described AD conversion module U3 connects, described electric capacity C1 other end ground connection, the described resistance R1 other end connects with the positive pole of described diode D2, the negative pole of described diode D2 and the I/O port of described MCU module U1 are connected, the output terminal of described AD conversion module U3 and the input end of described MCU module U1 are connected.
Compared with prior art, the beneficial effects of the utility model are:
Can diode drop in dynamic compensation peak-detector circuit by bucking-out system of the present utility model, can measure accurate ultrasonic signal peak value, thus can be applied to ultrasonic flow meter accurate operational process, structure is simple, practical.
Accompanying drawing explanation
Figure 1 shows that the circuit theory diagrams of the bucking-out system of ultrasonic flow meter peakvalue's checking of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The schematic diagram of the bucking-out system of ultrasonic flow meter peakvalue's checking of the present utility model as shown in Figure 1, comprise MCU module U1, diode D1, electronic switch U2, electric capacity C1, diode D2, resistance R1 and AD conversion module U3, wherein, MCU module can adopt MSP430 series monolithic MSP430F249TPM or other models of homologous series of TI company, also MCS-51 series can be adopted, AVR series or the MCU such as PIC is serial, S1 one end, ultrasonic signal source ground connection, the Chang Kaiduan of the other end and described electronic switch U2 is connected, the normally closed termination reference voltage V of described electronic switch U2
+, the common port of described electronic switch U2 connects with described diode D1 positive pole, the control end of described electronic switch U2 connects with the control output end of described MCU module U1, the negative pole of described diode D1 respectively with described electric capacity C1 one end, the input end of described resistance R1 one end and described AD conversion module U3 connects, described electric capacity C1 other end ground connection, the described resistance R1 other end connects with the positive pole of described diode D2, the negative pole of described diode D2 and the I/O port of described MCU module U1 are connected, the output terminal of described AD conversion module U3 and the input end of described MCU module U1 are connected, the negative pole that described MCU module U1 controls described diode D2 is high level, and controls described electronic switch U2 and switch to normal-closed end, makes the positive pole of described diode D1 connect reference voltage V
+, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
1, described MCU module U1 calculates the forward conduction voltage drop V of diode D1
ffor: V
f=V
+-V
1, the negative pole that described MCU module U1 controls described diode D2 is low level, the voltage of described electric capacity C1 is released, the negative pole controlling described diode D2 is again high level, and control described electronic switch U2 and switch to Chang Kaiduan, make described diode D1 positive pole meet ultrasonic signal source S1, signal is by described diode D1, and crest voltage is stored on described electric capacity C1, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
2, calculate the crest voltage V of signal
pfor: V
p=V
2+ V
f, as ultrasonic signal peak voltage calculated flow rate.
The bucking-out system of ultrasonic flow meter peakvalue's checking of the present utility model can compensate the forward conduction voltage drop of diode when normal ultrasonic signal is measured, obtain signal peak voltage accurately, eliminate the measurement caused due to diode model, batch difference or temperature drift and forbidden problem, the ultrasonic signal peak value measured is applied in accurate Calculation process.
The above is only preferred implementation of the present utility model; it should be noted that; for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (1)
1. the bucking-out system of a ultrasonic flow meter peakvalue's checking, it is characterized in that, comprise MCU module U1, diode D1, electronic switch U2, electric capacity C1, diode D2, resistance R1 and AD conversion module U3, S1 one end, ultrasonic signal source ground connection, the Chang Kaiduan of the other end and described electronic switch U2 is connected, the normally closed termination reference voltage V of described electronic switch U2
+, the common port of described electronic switch U2 connects with described diode D1 positive pole, the control end of described electronic switch U2 connects with the control output end of described MCU module U1, the negative pole of described diode D1 respectively with described electric capacity C1 one end, the input end of described resistance R1 one end and described AD conversion module U3 connects, described electric capacity C1 other end ground connection, the described resistance R1 other end connects with the positive pole of described diode D2, the negative pole of described diode D2 and the I/O port of described MCU module U1 are connected, the output terminal of described AD conversion module U3 and the input end of described MCU module U1 are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420711565.6U CN204214489U (en) | 2014-11-24 | 2014-11-24 | A kind of bucking-out system of ultrasonic flow meter peakvalue's checking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420711565.6U CN204214489U (en) | 2014-11-24 | 2014-11-24 | A kind of bucking-out system of ultrasonic flow meter peakvalue's checking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204214489U true CN204214489U (en) | 2015-03-18 |
Family
ID=52983154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420711565.6U Expired - Fee Related CN204214489U (en) | 2014-11-24 | 2014-11-24 | A kind of bucking-out system of ultrasonic flow meter peakvalue's checking |
Country Status (1)
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| CN (1) | CN204214489U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768205A (en) * | 2016-12-30 | 2017-05-31 | 天津市迅尔仪表科技有限公司 | A kind of ultrasonic flowmeter signal to noise ratio detects alarm module |
-
2014
- 2014-11-24 CN CN201420711565.6U patent/CN204214489U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768205A (en) * | 2016-12-30 | 2017-05-31 | 天津市迅尔仪表科技有限公司 | A kind of ultrasonic flowmeter signal to noise ratio detects alarm module |
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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: 20150318 Termination date: 20151124 |