CN216670548U

CN216670548U - Automatic gain phase adjusting circuit

Info

Publication number: CN216670548U
Application number: CN202123257671.0U
Authority: CN
Inventors: 赵国成
Original assignee: Shanghai Echo Msl Instruments Co ltd
Current assignee: Shanghai Echo Msl Instruments Co ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-06-03
Anticipated expiration: 2031-12-20

Abstract

The utility model discloses an automatic gain phase adjustment circuit, and belongs to the technical field of industrial process control. Automatic gain phase adjustment circuit, including tuning fork body mechanism, tuning fork body mechanism is including drive piezoceramics group and signal acquisition piezoceramics, signal acquisition piezoceramics's output is connected with vibration signal acquisition amplifier circuit, vibration signal acquisition amplifier circuit's output is connected with signal conditioning gain mechanism of amplification, signal conditioning gain mechanism of amplification includes self-checking mechanism and actuating mechanism. According to the utility model, the button switch can be pressed through the self-checking mechanism, so that the MCU module can perform self-checking, then the recording module is used for recording the best history data, and the button module is pressed down, so that the best resonance state is achieved through automatic tuning, and the situations that the resonance of the fork body has larger deviation and the instrument has a fault signal after the fork body is adhered and abraded or partially corroded on site are reduced.

Description

Automatic gain phase adjusting circuit

Technical Field

The utility model relates to the technical field of industrial process control, in particular to an automatic gain phase adjustment circuit.

Background

The solid tuning fork material level switch is an instrument commonly used in the material level control process, the reliability of the material level switch is very important to the safety of industrial control, the material level switch is often used for high-low level alarm, it is very important to prevent emptying of a storage tank, overflow and the like, the vibration signal intensity of a high sensor is high, the vibration starting time of the sensor is shortened, the problem of measurement misoperation caused by the fact that materials are accumulated at the root is reduced, and thus, the better guarantee can be brought to production operation, the safety of equipment and environmental pollution.

At present, most tuning fork detection technologies debug the resonance frequency of an electronic circuit and a tuning fork to achieve matching at normal temperature, but the resonance of the fork body has large deviation after the fork body is adhered and worn or partially corroded on site, and a fault signal occurs in an instrument.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to an automatic gain phase adjustment circuit for solving the above-mentioned drawbacks of the prior art.

In order to achieve the purpose, the utility model adopts the following technical scheme:

automatic gain phase adjustment circuit, including tuning fork body mechanism, tuning fork body mechanism is including drive piezoceramics group and signal acquisition piezoceramics, signal acquisition piezoceramics's output is connected with vibration signal acquisition amplifier circuit, vibration signal acquisition amplifier circuit's output is connected with signal conditioning gain amplification mechanism, signal conditioning gain amplification mechanism includes self-checking mechanism and actuating mechanism, wherein actuating mechanism's output is connected with piezoceramics circuit, piezoceramics circuit's output and drive piezoceramics group link.

Preferably, the self-checking mechanism includes sampling module, adjusting module, button switch, record module, MCU module and siren, button switch's output is connected with the MCU module, record module's output is connected with the MCU module, the output and the siren of MCU module are connected, sampling module's output is connected with MCU module and adjusting module respectively, one of them a set of output and the adjusting module of MCU module are connected, adjusting module and actuating mechanism are connected.

Preferably, the signal input of the signal acquisition piezoelectric ceramic is Y2, and the vibration signal acquisition amplifying circuit is U3A.

Preferably, the signal output by the U3A enters a self-checking mechanism, the signal of the self-checking mechanism is held by a peak voltage holding loop formed by the U1A and the U1B, and the signal is divided by a series circuit formed by the R1 and the R2 and then sent to an analog signal input end of the MCU module, so as to measure the magnitude of the signal.

Preferably, the adjusting module is U4, U4 changes the resistance value between BW by setting a control word, this resistance and C22 form a simple phase adjusting circuit, the adjustable range of the phase of the W end is 30 °, and U3B outputs the signal amplification to drive the vibration of the piezoelectric ceramic.

Preferably, the control word is output and controlled by the MCU module through the SPI.

Preferably, the driving piezoelectric ceramic group is Y3, the signal acquisition piezoelectric ceramic group is Y2, Y3 drives the fork body to vibrate, and Y2 obtains amplitude and phase signals of vibration.

Preferably, during the starting process of the tuning fork body mechanism, the gain of the closed loop is greater than 1.

Compared with the prior art, the utility model has the beneficial effects that:

1. the MCU module performs self-checking by arranging the self-checking mechanism and pressing the button switch, the optimal record of historical data is pressed by the button module through the recording module, automatic tuning is performed to achieve the optimal resonant state, and the situations that the resonance of the fork body has large deviation and a fault signal occurs in an instrument after the fork body is adhered and abraded or partially corroded on site are reduced.

2. The peak value detection circuit adopting the vibration signal is used for detecting the signal intensity of vibration in a natural state, and then the resistance value of the variable resistor is adjusted through the MCU, so that the detected peak value output signal is strongest, and the output efficiency of the circuit is improved.

Drawings

Fig. 1 is a schematic circuit block diagram of a tuning fork mechanism in an automatic gain phase adjustment circuit according to the present invention;

FIG. 2 is a schematic diagram illustrating a fork vibration circuit and circuitry;

FIG. 3 is a schematic diagram of the MCU module control loop and the communication output interface.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-3, automatic gain phase adjustment circuit, including tuning fork body mechanism, tuning fork body mechanism is including drive piezoceramics group and signal acquisition piezoceramics, signal acquisition piezoceramics's output is connected with vibration signal acquisition amplifier circuit, vibration signal acquisition amplifier circuit's output is connected with signal conditioning gain amplification mechanism, signal conditioning gain amplification mechanism includes self-checking mechanism and actuating mechanism, wherein actuating mechanism's output is connected with piezoceramics circuit, piezoceramics circuit's output and drive piezoceramics group link.

Specifically, refer to fig. 1 and learn, self-checking mechanism includes sampling module, adjusting module, button switch, record module, MCU module and siren, button switch's output is connected with the MCU module, record module's output is connected with the MCU module, the output and the siren of MCU module are connected, sampling module's output is connected with MCU module and adjusting module respectively, one of them a set of output and the adjusting module of MCU module are connected, adjusting module is connected with actuating mechanism, and wherein button switch can be used for self-checking and tuning, and record module can pass through the button with history data's record can autotune and reach the optimum condition of resonance, and the siren can be used for the control of alarm output and relay output.

Further, as can be known by referring to fig. 1 and 2, the signal input of the signal acquisition piezoelectric ceramic is Y2, the vibration signal acquisition amplifying circuit is U3A, the signal output by Y2 is 0 to 200mV, the frequency is 100 to 400Hz, the differential signal is amplified to 0 to 4V through U3A, the peak voltage of the signal is obtained through the sample-and-hold circuit after primary amplification, and then the voltage is transmitted to the inside of the MCU module to complete subsequent operations.

Furthermore, as can be known from fig. 1 and 2, the signal output by the U3A enters a self-checking mechanism, the signal of the self-checking mechanism is held by the C14 in a peak voltage holding loop formed by the U1A and the U1B, the signal is divided by a series circuit formed by the R1 and the R2 and then sent to an analog signal input end of the MCU module, the magnitude of the signal is measured, the MCU module samples the voltage of the holding circuit and then performs AD conversion, and then outputs a resistance value in a control resistance and capacitance phase adjusting loop for adjusting the phase value in the gain loop, so that the driving efficiency is optimal.

It should be noted that the adjusting module is U4, U4 changes the resistance value between BW by setting a control word, this resistance and C22 form a simple phase adjusting circuit, the adjustable range of the phase of the W end is 30 °, U3B is the vibration of the signal amplification output drive piezoelectric ceramic, the resistance value between BW is 0 to 50K, and the phase of the output excitation is adjusted by the resistance and the capacitance network.

It should be noted that, referring to fig. 1, the control word is controlled by the MCU module through the SPI output, the resistance value of the SPI output U4 is set through the communication of U5, and an optimal resistance can be obtained by comparing the vibration amplitude signals of the tuning fork, where the excitation efficiency is the highest, the vibration amplitude is the largest, and the oscillation starting time is the shortest.

In addition, as can be known from fig. 1, the driving piezoelectric ceramic group is Y3, the signal acquisition piezoelectric ceramic group is Y2, Y3 drives the fork body to vibrate, and Y2 obtains amplitude and phase signals of the vibration, so that subsequent normal operation can be completed, and the subsequent self-checking of the MCU module can be completed through the button switch.

Finally, as can be known from fig. 1, in the starting process of the tuning fork body mechanism, the gain of the closed loop is greater than 1, the tuning fork can start oscillation only when the gain of the closed loop is greater than 1, and the driving efficiency is highest and the oscillation amplitude is maximum when the oscillation phase of the tuning fork is matched with the gain closed loop of the line. We achieve the best effect of driving by adjusting the phase angle of the excitation by detecting the amplitude of the vibration.

In the present invention, the installation manner, the connection manner, or the setting manner of all the components described above are all common mechanical manners, and the specific structures, models, and coefficient indexes of all the components are their own technologies, which can be implemented as long as the beneficial effects thereof can be achieved, and thus, the details are not repeated.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

In the present invention, unless otherwise specified, the terms "upper, lower, left, right, front, back, inner, outer, vertical and horizontal" and the like included in the terms only represent the orientation of the terms in the conventional use state or are colloquially understood by those skilled in the art, and should not be construed as limiting the terms, and meanwhile, the terms "first", "second" and "third" and the like do not represent specific numbers and sequences, but are merely used for name differentiation, and the terms "include", "include" and any other variations are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

Claims

1. Automatic gain phase adjustment circuit, including tuning fork body mechanism, its characterized in that, tuning fork body mechanism is including drive piezoceramics group and signal acquisition piezoceramics, signal acquisition piezoceramics's output is connected with vibration signal acquisition amplifier circuit, vibration signal acquisition amplifier circuit's output is connected with signal conditioning gain amplification mechanism, signal conditioning gain amplification mechanism includes self-checking mechanism and actuating mechanism, wherein actuating mechanism's output is connected with piezoceramics circuit, piezoceramics circuit's output and drive piezoceramics group link.

2. The automatic gain phase adjustment circuit according to claim 1, wherein the self-checking mechanism comprises a sampling module, an adjustment module, a button switch, a recording module, an MCU module and an alarm, an output end of the button switch is connected to the MCU module, an output end of the recording module is connected to the MCU module, an output end of the MCU module is connected to the alarm, an output end of the sampling module is connected to the MCU module and the adjustment module, one set of output ends of the MCU module is connected to the adjustment module, and the adjustment module is connected to the driving mechanism.

3. The automatic gain phase adjustment circuit of claim 2, wherein the signal input of the signal acquisition piezo-ceramic is Y2 and the vibration signal acquisition amplification circuit is U3A.

4. The automatic gain phase adjustment circuit of claim 3, wherein the signal output by the U3A enters a self-checking mechanism, the signal of the self-checking mechanism is a peak voltage holding loop consisting of U1A and U1B, which is held by the C14, and the signal is divided by a series circuit formed by the R1 and the R2 and then sent to the analog signal input end of the MCU module to measure the magnitude of the signal.

5. The automatic gain phase adjustment circuit of claim 2, wherein the adjustment module is U4, U4 is a simple phase adjustment circuit composed of C22 and a resistance value between BW changed by setting a control word, the phase of W end can be adjusted in a range of 30 °, and U3B drives the vibration of piezoelectric ceramic for signal amplification output.

6. The automatic gain phase adjustment circuit of claim 5, wherein the control word is controlled by the MCU module via the SPI output.

7. The automatic gain phase adjustment circuit of claim 3, wherein the driving piezo-ceramic set is Y3.

8. The automatic gain phase adjustment circuit of claim 3, wherein a gain of a closed loop during actuation of the tuning fork mechanism is greater than 1.