CN105784036A - Differential type power amplifying circuit in Coriolis mass flowmeter driving system - Google Patents
Differential type power amplifying circuit in Coriolis mass flowmeter driving system Download PDFInfo
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- CN105784036A CN105784036A CN201610214462.2A CN201610214462A CN105784036A CN 105784036 A CN105784036 A CN 105784036A CN 201610214462 A CN201610214462 A CN 201610214462A CN 105784036 A CN105784036 A CN 105784036A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
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- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to the field of flow detection, in particular to a differential type power amplifying circuit in a Coriolis mass flowmeter driving system. The differential type power amplifying circuit is modified based on a single ended power amplifying circuit in an original driving system. Under the limitation of a safety barrier circuit and supply voltage, driving energy is effectively improved, and the problem of driving energy insufficiency under the conditions of a single phase flow driving thick-tube-wall flow tube and gas-liquid two-phase flow is solved.
Description
Technical field
The present invention relates to field of flow detection, being the power amplification circuit being applied in Coriolis mass flowmeter drive system, what be specifically related to a kind of differential type is applied to analog Coriolis mass flowmeter drive system and the power amplification circuit of digital Coriolis mass flowmeter drive system.
Background technology
Coriolis mass flowmeter directly measuring for liquid mass flow, certainty of measurement is high, reproducible, and can also realize the measurement under the multiparameters such as the volume flow of fluid, density, temperature and different fluid situation simultaneously, has broad application prospects.Coriolis mass flowmeter is made up of primary instrument (or claiming mass flow sensor) and transmitter (or claiming secondary meter).Primary instrument includes flowtube, drives coil, pick-up coil (magnetoelectric velocity transducer) and temperature sensor, and transmitter includes signal processing system and flowtube drive system (abbreviation drive system).Drive system produces to drive signal, it is provided that gives and drives coil；Drive the vibration of coil drive flowtube.The Vibration Condition of magnetoelectric velocity transducer detection flowtube, and the vibration information detected is delivered to signal processing system process.General Coriolis mass flowmeter is when factory testing, it is necessary to tested by a large amount of single-phase water flow calibrations, to determine the optimal vibration amplitude of flowtube.Flowtube is vibrated under optimal magnitude, has the measurement performance of the best and the highest drive efficiency, and is conducive to extending its service life.
In order to ensure industrial instrument safety in actual applications, country has formulated a series of requirement about essential safety.Coriolis mass flowmeter is in order to meet the Intrinsic Safety standard of country's formulation, it usually needs arrange Zener type safety barrier circuit, in order to limit magnetoelectric velocity transducer signal, temperature signal and to drive the energy of signal.
When measuring single-phase flow, domestic frequently with analog Coriolis mass flowmeter (its signal drives and signal processing is all the mode adopting analog circuit).The flowtube tube wall of some coriolis mass flow sensor is thicker, need higher driving energy, in addition safety barrier circuit is to driving energy quantitative limitation, so, in order to maintain vibrating flow tube at optimal magnitude place, appear in the problem driving energy not enough, often now drive signal to there will be the phenomenon cutting top.
When measuring biphase gas and liquid flow, it is necessary to use digital Coriolis mass flowmeter (its signal drives and signal processing is all the mode adopting digital signal).Now, flowtube internal damping ratio can increase suddenly, exceeds 1～2 order of magnitude time generally than single-phase flow.Vibrate at optimal magnitude place to maintain flowtube, it is necessary to higher driving energy.Similarly, since the restriction of safety barrier circuit so that drive energy not enough, cause that vibrating flow tube amplitude is on the low side, reduce the signal to noise ratio of magnetoelectric velocity transducer signal.It addition, during two phase flow, flowtube internal damping is more violent than change, driving energy not enough, magnetoelectric velocity transducer signal is unable to reach optimal magnitude in addition, thus sensor signal amplitude changes acutely when being reflected in two-phase flow measurement.
For the problem that above-mentioned single-phase flow produces, at present domestic with abroad all do not carry out deep research.Driving problems during for biphase gas and liquid flow, foreign study scholar Henry and Yeung thinks that the factor such as quantity of the geometry of sensor, flowtube driver affects the size (HenryM of vibration amplitude, YeungH, MattarW, etal.HowaCoriolismassflowmetercanoperateintwo-phase (gas/liquid) flow [C] .ISA2004ExpoTechnicalConference, 2004:17-30).They have employed the sensor of B shape dual drive structure, and dual drive, while being not above the restriction of guard grating energy, makes driving energy double, and therefore, flowtube obtains the vibration of higher magnitude.But, current B shape coriolis mass flow sensor is comparatively rare, and most cases coriolis mass flow sensor only has single driver, so, being directed to the coriolis mass flow sensor of single driver, the party's rule cannot improve driving energy, becomes no longer to be suitable for.
Summary of the invention
Above-mentioned owing to driving energy deficiency problem encountered in order to overcome, for the drive system of analog Coriolis mass flowmeter and digital Coriolis mass flowmeter, the present invention provides a kind of differential type power amplification circuit.No matter this power amplification circuit is applied in analog or digital drive system, the driving energy of Coriolis mass flowmeter under the restriction of safety barrier circuit, can both be effectively improved.
The technical solution that the present invention is concrete is:
Analog drive system in analog Coriolis mass flowmeter is amplified by voltage follow, precision rectifying, gain control, multiplication, is driven protection and power amplification circuit six part to form.The vibrating flow tube signal of pick-up coil output, after voltage follow amplifies, can be divided into two-way, and wherein first a road carries out after rectification obtains amplitude information, sending into an input of multiplication amplifying element.Another road signal is directly entered another input of multiplication amplifying element, the output of multiplication amplifying element, is about to the complete of the two gained that is multiplied and drives signal to send into power amplification circuit, and the output of power amplification circuit is directly used in driving vibrating flow tube.
Digital drive system in digital Coriolis mass flowmeter is made up of signal condition amplifying circuit, DSP (digital signal processor) minimum system, digital driver circuitry, power amplification circuit four part.Wherein, according to the sensor signal that signal conditioning circuit collects, DSP calculate the parameters such as the frequency needed for driving signal, phase place, amplitude, then driven signal accordingly by DSP control digital driver circuitry output.This driving signal ingoing power amplifying circuit, its output is directly used in driving vibrating flow tube.
The present invention adopts two High-current output operational amplifiers to coordinate peripheral resistance, and the power amplification circuit of composition single-ended transfer difference formula, for substituting the power amplification circuit in conventional Coriolis mass flowmeter drive system.And passive high three-way filter is set before power amplification circuit, while filtering input signal DC component, provides return flow path to the bias current of opamp input terminal.
The advantage of patent of the present invention is:
Adopt the Coriolis mass flowmeter drive system of the power amplification circuit of differential type, under the restriction of safety barrier circuit, when identical supply voltage: when measuring single-phase flow, efficiently solve and drive the driving signal that thick tube wall flowtube produces to cut top problem；When measuring biphase gas and liquid flow, it is effectively improved driving energy, adds the amplitude of magnetoelectric velocity transducer signal, make vibrating flow tube closer to optimal magnitude, improve the signal to noise ratio of magnetoelectric velocity transducer signal.
Accompanying drawing explanation
Fig. 1 is analog drive system circuit hardware composition frame chart；
Fig. 2 is digital drive circuit system hardware composition frame chart；
Fig. 3 is the circuit theory diagrams of single-ended power amplification circuit；
Fig. 4 is the TINA analogous diagram of single-ended power amplification circuit；
Fig. 5 is the TINA simulation result oscillogram of single-ended power amplification circuit；
Driving coil current virtual value when Fig. 6 is to use single-ended power amplification circuit；
Fig. 7 is differential type power amplification circuit schematic diagram of the present invention；
Fig. 8 is differential type power amplification circuit TINA analogous diagram of the present invention；
Fig. 9 is differential type power amplification circuit TINA simulation result oscillogram of the present invention；
Driving coil current virtual value when Figure 10 is to use differential type power amplification circuit of the present invention；
Figure 11 is the test result figure that traditional analog drives the thick tube wall flowtube of coupling；
Figure 12 is the thick tube wall flowtube test result figure of analog-driven coupling using differential type power amplification circuit；
Figure 13 is air and liquid twophase flow experiment structure drawing of device.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the circuit hardware composition frame chart of analog drive system.Analog drive circuit is amplified by voltage follow, precision rectifying, gain control, multiplication, is driven six parts such as protection and power amplification to form.
In FIG, the original vibration signal of magnetoelectric velocity transducer can be divided into two-way to process after voltage follow, amplification, filtering, a wherein road is carried out precision rectifying and obtains the amplitude information of sensor signal, after the gain required for rear class gain control link obtains driving signal, send into one end of multiplier；Using another road signal as the shape information driven needed for signal, it is sent directly into the other end of multiplier.So, the two paths of signals comprising amplitude and shape information will export required driving primary signal after multiplier.This driving primary signal, after rear class power amplification, is added in the driving signal at sensor single coil excitement two ends needed for obtaining.The flowtube of sensor is damaged in order to avoid driving signal excessive; analog drive circuit is provided with Drive Protecting Circuit; after driving signal amplitude exceedes and pre-sets threshold voltage; circuit will automatically switch to little gain and drive; limit driving signal amplitude, indirectly protect the sensor from damaging.
Fig. 2 is the circuit hardware composition frame chart of digital drive system.Digital drive circuit system by nursing one's health amplifying circuit, DSP minimum system, digital driver circuitry, power amplification circuit four part form.Its work process is: the magnetoelectric velocity transducer signal collected according to signal conditioning circuit, processor DSP calculate the parameters such as the frequency needed for driving signal, phase place, amplitude, then driven signal accordingly by DSP control digital driver circuitry output.This driving signal ingoing power amplifying element, its output is final driving signal, for directly driving vibrating flow tube.
Fig. 3 is single-ended power amplification circuit, and analog-driven and digital drive share same single-ended power amplification circuit, are shown in Fig. 3.In figure 3, single-ended power amplification circuit adopts positive and negative 9V power voltage supply, and High-current output operational amplifier U6 (OPA551), resistance R28, resistance R29 form in-phase amplifier, and resistance R27 and electric capacity C24 forms passive high three-way filter.During normal operation, driving signal to be amplified inputs from " IN ", after in-phase amplifier amplifies, exports from " Drive+ ", " Drive+ " end is directly connected to the driving coil anode of coriolis mass flow sensor, drives the negative terminal of coil to connect the ground level of transmitter.
Fig. 4 is the TINA artificial circuit of single-ended power amplification circuit.In the diagram, VG1 is alternating message source, is used for simulating driving primary signal to be amplified, and output is amplitude is the sinusoidal signal of 0～3.3V.Operational amplifier U3 is identical with reality, and selecting supply voltage is positive and negative 9V.Amplifier U3 and resistance R1, resistance R2 form in-phase amplification circuit.For not making the output signal amplitude of amplifier U3 exceed power rail scope, export the amplitude of signal according to VG1, it is determined that resistance R1 resistance is 3.5K, resistance R2 resistance is 1K.Zener diode Z1, Z2, Z3, Z4 simulate the Zener type safety barrier circuit in actual transmitter, and selection model is 1N5347, and restriction drives the voltage magnitude of signal.The driving coil parameter of resistance R3 and inductance L1 series equivalent coriolis mass flow sensor, by the parameter of real sensor CMF025, it is determined that resistance R3 resistance is 180 Ω, inductance L1 inductance value is 3mH.AM1 is ammeter, is used for testing and flows through the virtual value driving coil current.
Fig. 5 is the TINA simulation result waveform of single-ended power amplification circuit.In Figure 5, VF1 is the signal output waveform of above-mentioned alternating message source VG1.VF2 is the drive signal waveform after amplifying.When output reaches full web state, drive signal waveform amplitude is 14.63Vpp, and now, driving the virtual value of electric current in coil is 29.17mA, as shown in Figure 6.
Fig. 7 is the schematic diagram of differential type power amplification circuit.In the figure 7, power supply is+VCC and-VCC.The driving signal that the input of J2 end is to be amplified, owing to this signal demand is connected to the normal phase input end of rear class amplifier, so, before signal sends into amplifier, need to add electric capacity C5 and the resistance R4 passive high three-way filter constituted, the effect of the isolation input DC component of signal, filtering and offer bias current return flow path is provided.Power amplifier level as drive circuit, need to provide bigger output electric current to drive flowtube, so, select High-current output amplifier U1, U2 (OPA551) and resistance R1, resistance R2, resistance R3 to form single-ended transfer difference amplifier, be used for driving vibrating flow tube.Wherein, described resistance R1, R2, R3 determine the signal amplification factor of described power amplification circuit.Electric capacity C1, C2, C3, C4, C6, C7, C8, C9 are the decoupling capacitance of described operational amplifier.
During real work, driving signal to be amplified inputs from J2, and after single-ended transfer difference amplifies, its output " OUT+ " is connected to the anode driving coil, and " OUT-" is connected to the negative terminal driving coil.In the figure 7, if the normal phase input end input voltage that normal phase input end input voltage is V1, amplifier U2 of amplifier U1 is V2, the electric current in drive circuit is I0, in current direction such as Fig. 4-8 shown in arrow mark.During normal operation, amplifier U1 and U2 may make up feedback circuit, so, " empty short " principle to know, the end of oppisite phase input voltage that end of oppisite phase input voltage is V1, U2 of U1 is V2.Again with resistance R2 for object of study, according to Ohm's law, it is easy to get:
So, the voltage that can drive coil one end is:
In like manner, the voltage of the driving coil other end is:
As can be seen here, driving coil two ends institute making alive is:
Fig. 8 is differential type power amplification circuit TINA analogous diagram.In fig. 8, for the purpose of contrast, identical with Fig. 4, power supply selects positive and negative 9V.VG1 is alternating message source, is used for simulating driving primary signal to be amplified, and output is amplitude is the sinusoidal signal of 0～3.3V.Operational amplifier U1, U2 and resistance R3, resistance R4, resistance R5 form single-ended transfer difference structure for amplifying, and its output is respectively connected to drive anode and the negative terminal of coil.For not making the output signal amplitude of amplifier exceed power rail scope, export the amplitude of signal according to VG1, it is determined that resistance R3 resistance is 1K, resistance R4 resistance is 3K, and the resistance of resistance R5 is 4K.Zener diode Z1, Z2, Z3, Z4 simulate the Zener type safety barrier circuit in actual transmitter, and selection model is 1N5347, and restriction drives the voltage magnitude of signal.The driving coil parameter of resistance R3 and inductance L1 series equivalent coriolis mass flow sensor, by the parameter of real sensor CMF025, it is determined that resistance R3 resistance is 180 Ω, inductance L1 inductance value is 3mH.AM1 is ammeter, is used for testing and flows through the virtual value driving coil current.
Fig. 9 is the TINA simulation result oscillogram of differential type power amplification circuit.In fig .9, VF1 is the signal output waveform of above-mentioned alternating message source VG1.VF2 is after differential amplification, drives the signal waveform of coil anode.VF3 is after differential amplification, drives the signal waveform of coil negative terminal.As seen from Figure 9, when making amplifier output reach full web state, drive signal waveform amplitude is 24.4Vpp, and now driving the virtual value of electric current in coil is 51.85mA, as shown in Figure 10.
Figure 11 is the test result figure of the thick tube wall flowtube of traditional analog drive system coupling.During actual test, traditional analog is used to drive the transmitter raw DN25 bore thickness tube wall sensor of coupling Ai Mo.In fig. 11, the waveform (being designated as " CH1 ") of 1 passage in transducer signal modulate circuit, the vibration signal of magnetoelectric sensor before input ADC；The driving signal that the waveform (being designated as " CH2 ") of 2 passages exports for transmitter analog drive circuit.Owing to driving energy quantitative limitation, it is impossible to provide enough driving energy, when vibration amplitude reaches 4.4V, signal is driven to must operate at the state cutting top.
Figure 12 is the test result figure of the thick tube wall flowtube of analog drive system coupling using differential type power amplification circuit.The raw DN25 bore thickness tube wall sensor of similarly matched above-mentioned Ai Mo, in fig. 12, the vibration signal that the waveform (being designated as " CH1 ") of 1 passage is sensor, the waveform (being designated as " CH2 ") of 2 passages is the driving signal being applied to and driving coil anode, visible, when sensor output signal amplitude reaches 4.52V, driving signal amplitude is 7.8Vpp, still not up to the power supply upper limit.Table 1 drives the Comparative result of test for single-phase flow.By table 1 it can be seen that use the analog drive system of differential type power amplification circuit structure, it is effectively improved driving energy.
Table 1 drives energy Experimental comparison results before and after improving
Figure 13 is air and liquid twophase flow experiment structure drawing of device.Flow down, for gas-liquid two-phase, the problem that transducer driven energy is not enough, the two phase flow experimental provision shown in Figure 13 is tested.In fig. 13, device is made up of water tank, water pump, air compressor, Pressure gauge, coriolis mass flow sensor, Coriolis mass flow transmitter, gas float flow meter, some valves and pipeline.On device, ducts upstream and downstream are respectively mounted a coriolis mass flow sensor produced by Ai Mosheng company, and model is CMF025, and this sensor profile is Ω shape, and during full packages, natural frequency is about 135Hz.The transmitter of device upstream sensor matching is standard scale, and this standard scale is the 2700 type transmitters developed by Ai Mosheng company, and when mating CMF025 model sensor, certainty of measurement is 0.1 grade.The transmitter of device downstream sensor coupling experiment, tests as tested table.
During device normal operation, water is extracted out by water pump from water tank, flows separately through two sensors along pipeline by the direction of arrow in figure, is then return to water tank, constitutes circulation.By valve 1 and valve 3, it is possible to regulating fluid flow size in pipeline, range of flow is 1kg/min to 16kg/min.By valve 2, it is possible to achieve the addition of gas and closedown, to carry out air and liquid twophase flow experiment.When carrying out air and liquid twophase flow experiment, gas pipeline place between upstream sensor and downstream sensor adds, so, downstream sensor (tested table) is in gas-liquid two-phase stream mode, and upstream sensor (standard scale) is measured is single-phase flow.Read the size of fluid flow during experiment by the measured value of standard scale, the size of gas flow is then obtained by the reading of gas float flow meter.
In order to contrast differences fractional power amplifying circuit drives effect to drive the difference of effect with traditional single-ended structure, biphase gas and liquid flow device shown in Figure 13 carries out the driving energy test experiment under two phase flow.During experiment, by big (16kg/min), in (8kg/min), little (4kg/min) three different flows points change flow velocitys, and respectively under different flow points, add gas from small to large by air content.With the amplitude of magnetoelectric velocity transducer signal in oscillograph Real Time Observation acquisition and conditioning circuit and driving signal amplitude in experimentation, meanwhile, FLUKE circuit tester is connected in series in drive circuit, the virtual value driving electric current on Test driver coil.During experiment, the density under record current state drops, magnetoelectric velocity transducer signal amplitude, drive signal amplitude and drive the virtual value of electric current in coil.Herein, it is a kind of physical quantity that can reflect air content size that density drops, and can be calculated by transmitter in real time obtained by frequency and temperature.The defined formula that density drops is:
In formula, D0For the density of single-phase liquid (water), DgIt is the hybrid density of two phase time fluids, can be tried to achieve by formula.In general, density drops more high, represents air content more big.
The two phase flow that table 2 is conventional ADS driving mode drives energy experimental result, and table 3 is that the two phase flow using differential type actuation techniques drives energy experimental result.
Table 2 conventional ADS driving mode two phase flow drives energy test
Table 3 differential driving mode two phase flow drives energy test
By table 2 with the Data Comparison in table 3 it can be concluded that work as Coriolis mass flow transmitter drive system there is identical supply voltage, and under identical safety barrier circuit restriction, during the same flow identical air content of point, use the drive system of differential type power amplification circuit, the amplitude of magnetoelectric velocity transducer signal is above using the amplitude of single-ended power amplification circuit drive system sensor, it drives current effective value in coil to be 34.2mA, have increased significantly compared to the 10.8mA of single-ended power amplification circuit drive circuit, it is effectively improved driving energy.
Claims (4)
1. the differential type power amplification circuit in Coriolis mass flowmeter drive system, is made up of the power amplification circuit of passive high three-way filter and single-ended transfer difference formula, it is characterised in that:
The power amplification circuit of the single-ended transfer difference formula being made up of two High-current output operational amplifiers and peripheral resistance, can make Coriolis mass flow transmitter under the restriction of safety barrier circuit and drive circuitry voltage, improve and drive energy；Passive high three-way filter is set before power amplification circuit.
2. the differential type power amplification circuit in a kind of Coriolis mass flowmeter drive system according to claim 1, it is characterised in that:
Described passive high three-way filter is made up of resistance R4 and electric capacity C5, and wherein, the effect of electric capacity C5 is the DC component filtering input sinusoidal drive signals；The effect of resistance R4 is to provide return flow path to the input bias current of described High-current output operational amplifier；Electric capacity C5 determines the cut-off frequency of described passive high three-way filter together with resistance R4.
3. the differential type power amplification circuit in a kind of Coriolis mass flowmeter drive system according to claim 1, it is characterised in that:
Described differential type power amplification circuit, is made up of High-current output amplifier U1, High-current output amplifier U2, resistance R1, resistance R2, resistance R3, is used for driving vibrating flow tube；Wherein, described resistance R1, R2, R3 determine the signal amplification factor of described power amplification circuit；Electric capacity C1, C2, C3, C4, C6, C7, C8, C9 are the decoupling capacitance of described operational amplifier；
During work, driving signal to be amplified inputs from J2, and after single-ended transfer difference amplifies, its output " OUT+ " is connected to the anode driving coil, and " OUT-" is connected to the negative terminal driving coil.
4. the differential type power amplification circuit in a kind of Coriolis mass flowmeter drive system according to claim 1, it is characterised in that:
Described differential type power amplification circuit, the concrete model of described great current operation amplifier is OPA551UA.
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| CN110044431A (en) * | 2018-01-16 | 2019-07-23 | 高准有限公司 | Transmitter and flowmeter |
| CN115077646A (en) * | 2022-08-18 | 2022-09-20 | 南京天梯自动化设备股份有限公司 | Signal regulating circuit and signal offset self-checking correction method |
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