CN208689428U - A kind of control circuit of magnetostriction liquidometer - Google Patents

Abstract

The utility model relates to a kind of control circuits of magnetostriction liquidometer, including master controller, the master controller is connected by driving circuit with waveguide filament, the waveguide filament is threaded through in feedback coil, the master controller is also connected with high precision count module, and two feedback terminals of the feedback coil are connected with the high precision count module or are directly connected on processor by amplifying filter module.The measurement accuracy that the liquid level passes meter can be improved by using high precision count module by the application, feedback coil is connected with high precision count module or is directly connected on processor by amplifying filter module, amplification filter module is amplified using level Four and every grade of differential amplifier circuit is designed with RC filter circuit, thus the anti-interference ability being remarkably improved in the liquidometer measurement process, measurement result high reliablity.

Description

A kind of control circuit of magnetostriction liquidometer

Technical field

The utility model relates to liquid level sensor manufacturing technology, especially a kind of control circuit of magnetostriction liquidometer.

Background technique

Magnetostriction liquidometer is sensed using the high-precision of magnetostriction principle manufacture, ultralong-stroke Absolute position measurement Device is made of impulse circuit, waveguide wire, echo-signal unit, structural member and protection sleeve pipe etc., has precision height, stability Reliably, the features such as service life long, easy for installation, a variety of way of output is available, can not only measure the straight line position of moving object It moves, and displacement and the speed signal of moving object can be provided.Due to using non-contact measurement mode, magnetostrictive liquid level It counts performance to stablize, long service life, and has a variety of way of outputs selective, be widely used in petrochemical industry, food, Shui Chu In the industry devices such as reason, environmental protection, pesticide, papermaking, reservoir, dyestuff and oil pressure machinery.Its working principle is that: when measuring, pulse Generator generates waveguide pulse, and the current impulse i.e. initial pulse propagated along waveguide wire is transformed into after electronic section is handled, The magnetic field that the magnetic field of generation and magnet ring are formed is superimposed, generates instantaneous torsion, twists waveguide wire and generate tension pulse, this Pulse is returned with fixed speed along waveguide wire, induced current pulse, that is, terminate pulse is generated at coil both ends, by measuring The time difference between initial pulse and terminate pulse can accurately measure liquid level or displacement.

A kind of liquid level survey of magnetostriction liquidometer as disclosed in the Chinese patent document of Publication No. CN204479139U Amount system, including the pulse excitation module for generating excitation pulse signal, the signal for amplifying silk strain-pulse signal is put Big module, temperature measurement module, central processing unit and power module, technical solution disclosed in the patent document, although survey can be improved Accuracy of measurement, but the measuring system interference free performance is poor, poor reliability.

Utility model content

The purpose of this utility model is to provide a kind of control circuits of magnetostriction liquidometer, for solving existing mangneto The problem of flexible liquidometer interference free performance difference.

To solve the above-mentioned problems, the utility model provides a kind of control circuit of magnetostriction liquidometer, including master control Device processed, the master controller are connected by driving circuit with waveguide filament, and the waveguide filament is threaded through in feedback coil, the master control Device processed is also connected with high precision count module, and two feedback terminals of the feedback coil pass through amplification filter module and the height Precision counting module is connected or is directly connected on processor；The amplification filter module includes being connected with the first feedback terminal The first difference amplifier and the second difference amplifier for being connected with the second feedback terminal, first difference amplifier and described Second difference amplifier is connected separately with RC filter circuit, first difference amplifier, second difference amplifier it is defeated Outlet is connected with the input terminal of third difference amplifier respectively, and the third difference amplifier is connected with RC filter circuit, described The output end of third difference amplifier is connected with the 4th difference amplifier, and the 4th difference amplifier is connected with RC filtered electrical The output end on road, the 4th difference amplifier is connected with the high precision count module.

Magnetostrictive liquid level sensor provided by the utility model also has following technical characteristic:

Further, the master controller uses 32 arm processors, it is preferable that the master controller uses LCP1114FBD48(LCP1100 series) chip.

Further, the high precision count module uses TDC-GP21/GP22 chip.

Further, the master controller is also connected with reservoir, watchdog module, temperature sensor and RS485/RS23 Interface module.

The utility model has the following beneficial effects: the control circuit of the liquidometer, by using high precision count module Can be improved the liquid level pass meter measurement accuracy, feedback coil by amplify filter module be connected with high precision count module or directly It being connected on processor in succession, amplification filter module is amplified using level Four and every grade of differential amplifier circuit is designed with RC filter circuit, Thus the anti-interference ability being remarkably improved in the liquidometer measurement process, measurement result high reliablity；Specifically, main control Device sends initial pulse to waveguide filament by driving circuit, and the terminate pulse that feedback coil generates passes through amplification filter module, height Master controller is fed back to after precision counting module, the amplification filter module of the use in the application can effectively feedback coil generate Terminate pulse amplify and filter out interference signal, the anti-interference energy being thus remarkably improved in the liquidometer measurement process Power guarantees the reliability of measurement result.

Detailed description of the invention

Fig. 1 is the functional block diagram of the control circuit of the magnetostriction liquidometer of the utility model embodiment；

Fig. 2 is the electrical block diagram of the master controller in the utility model embodiment

Fig. 3 is the electrical block diagram of the amplification filter module in the utility model embodiment；

Fig. 4 is the electrical block diagram of the high precision count module in the utility model embodiment；

Fig. 5 is the electrical block diagram of the driving circuit in the utility model embodiment.

Specific embodiment

The utility model is described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that not rushing In the case where prominent, the feature in the embodiments of the present invention and embodiment be can be combined with each other.

It, should in one embodiment of the control circuit of the magnetostriction liquidometer of the utility model as shown in Figures 1 to 5 The control circuit of magnetostriction liquidometer includes master controller 10, and master controller 10 passes through driving circuit 20 and 30 phase of waveguide filament Even, waveguide filament 30 is threaded through in feedback coil 40, and master controller 10 uses 32 arm processors, and master controller 10 is also connected with Two feedback terminals TL1, TL2 of high precision count module 50, feedback coil 40 are counted by amplification filter module 60 and high-precision Digital-to-analogue block 50 is connected；Amplification filter module 60 includes the first difference amplifier 61 being connected with the first feedback terminal TL1 and with the The second two feedback terminal TL2 connected difference amplifier 62, first difference amplifier 61 and second difference amplifier 62 are connected separately with RC filter circuit, the output end difference of first difference amplifier 61, second difference amplifier 62 It is connected with the input terminal of third difference amplifier 63, the third difference amplifier 63 is connected with RC filter circuit, the third The output end of difference amplifier 63 is connected with the 4th difference amplifier 64, and the 4th difference amplifier 64 is connected with RC filter circuit, The output end BD-EINTO of 4th difference amplifier 64 is connected with high precision count module 50.Magnetostriction liquid in the embodiment The measurement accuracy that the liquid level passes meter can be improved by using high precision count module in the control circuit of position meter, and feedback coil passes through Amplification filter module is connected with high precision count module or is directly connected on processor, and amplification filter module is put using level Four Big and every grade of differential amplifier circuit is designed with RC filter circuit, is thus remarkably improved anti-interference in the liquidometer measurement process Ability, measurement result high reliablity；Specifically, master controller 10 sends starting arteries and veins to waveguide filament 30 by driving circuit 20 Punching, the terminate pulse that feedback coil 40 generates is by feeding back to main control after amplification filter module 60, high precision count module 50 Device 10, the amplification filter module used in the examples can effectively amplify the terminate pulse that feedback coil generates and mistake Interference signal is filtered, the anti-interference ability being thus remarkably improved in the liquidometer measurement process guarantees the reliable of measurement result Property.The working principle of magnetostriction liquidometer, the circuit connection structure of master controller, specific structure of driving circuit etc. belong to this The routine techniques in field, details are not described herein.

In one embodiment of the application, as shown in Fig. 2, 32 arm processors can be used in master controller 10, pass through Using 32 arm processors as master controller, processing speed can be effectively improved, processing speed is fast, and stability is good and expands Ability is strong；Preferably, master controller 10 is using LCP1114FBD48(LCP1100 series) chip；Master controller 10 be equipped with The Interface Terminal BD-EINTO that amplification filter module 60 or high precision count module 50 are connected, is additionally provided with and connect with driving circuit 20 Interface Terminal SEND1.Preferably, as shown in figure 4, high precision count module 50 uses TDC-GP21/GP22 chip.It is preferred that Ground, as shown in Figure 1, master controller 10 is also connected with power module 71, reservoir 72, watchdog module 73, temperature sensor 74 With RS485/RS23 interface module 75.Specifically, power module, reservoir, watchdog module, temperature sensor and RS485/ The specific connection circuit of the devices such as RS23 interface module, those skilled in the art can select or design as needed, herein no longer It repeats.

In another embodiment of the application, it is preferable that amplification filter module as shown in Figure 3, the first feedback terminal TL1 is connected with resistance R9, resistance R10, the second feedback terminal TL2 are connected with resistance R19, resistance R20, resistance R3, capacitor C2, electricity Resistance R13, capacitor C7 respectively constitute two RC filter units being connected with the first difference amplifier 61, i.e. the first difference amplifier 61 The RC filter circuit of connection includes two RC filter units；Similarly, the RC filter circuit of the second difference amplifier 62 connection includes It is made of capacitor C8, resistance R17, capacitor C12, capacitor C20, resistance R22, resistance R23, resistance R24, resistance R25；First difference The output end of amplifier is connected with resistance R5, and the output end of the second difference amplifier is connected with resistance R18, the first differential amplification Device, the second difference amplifier model MAX4453ESA can be used.Third difference amplifier 63 is connected with capacitor C6, resistance R12 The RC filter circuit of composition, third difference amplifier 63 are also connected with capacitor C25, resistance R15, diode D3, diode D9, electricity Hinder the devices such as R27.4th difference amplifier 64 is connected with the RC filter circuit of capacitor C24, resistance R26 composition, and the 4th difference is put Big device 64 is also connected with the devices such as resistance R14, resistance R39, capacitor C9, resistance R21, diode D1, diode D2, resistance R32, The output end of diode D2 is connected with output end BD-EINTO by resistance R11；Magnetostrictive liquid level sensing in the embodiment Device, amplification filter module is amplified using level Four and every grade of differential amplifier circuit is designed with RC filter circuit, strong antijamming capability, filter Wave effect is good, high reliablity.

In another embodiment of the application, as shown in Figure 4, Figure 5, the respectively high precision count module of the application 50, an example of driving circuit 20；In this embodiment, first by the interface of 10 LCP1114FBD48 chip of master controller Terminal SEND1 issues the pumping signal driving circuit 20 started, while pumping signal is sent to high precision count module 50 The START foot of TDC-GP21 chip, high precision count module 50 start counting；Driving circuit 20 drives after receiving pumping signal Waveguide filament 30 generates sense electrical signal with magnetic float and answers, and acquires feedback signal by feedback coil 40 and is sent to amplification filter module 60 It is filtered, amplifies and Shape correction, signal is respectively transmitted connecing to master controller LCP1114FBD48 chip by treated The STOP1 pin of mouth terminal BD-EINTO and high precision count module TDC-GP21 chip, high precision count module 50 stop meter Number, the GJD-EINTO pin of high precision count module TDC-GP21 chip is to 10 LCP1114FBD48 chip of master controller PIO2_9 pin (pin numbering 24) sends acquisition and completes signal, and master controller 10 begins through serial ports and reads high precision count mould The data of block TDC-GP21 chip calculate and start pulse and terminate the time between pulse, then can be obtained by parameter calculating To measurement result.In another embodiment of the application, precision counting module 50 can be saved, amplification filter module directly with Master controller is connected.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations； Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc. With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution The spirit and scope of scheme.

Claims (4)

1. a kind of control circuit of magnetostriction liquidometer, including master controller, the master controller passes through driving circuit and wave Seal wire is connected, and the waveguide filament is threaded through in feedback coil, which is characterized in that the master controller is also connected with high precision count Module, two feedback terminals of the feedback coil are connected by amplifying filter module with the high precision count module；It is described Amplifying filter module includes the first difference amplifier being connected with the first feedback terminal and be connected with the second feedback terminal second Difference amplifier, first difference amplifier and second difference amplifier are connected separately with RC filter circuit, and described One difference amplifier, second difference amplifier output end be connected respectively with the input terminal of third difference amplifier, it is described Third difference amplifier is connected with RC filter circuit, and the output end of the third difference amplifier is connected with the 4th differential amplification Device, the 4th difference amplifier are connected with RC filter circuit, the output end of the 4th difference amplifier and the high-precision Counting module is connected.

2. control circuit according to claim 1, it is characterised in that: the master controller uses LCP1114FBD48 core Piece.

3. control circuit according to claim 1, it is characterised in that: the high precision count module uses TDC-GP21/ GP22 chip.

4. control circuit according to claim 1, it is characterised in that: the master controller is also connected with reservoir, guards the gate Dog module, temperature sensor and RS485/RS23 interface module.