CN112928945A - Combined type piezoceramics drive circuit - Google Patents
Combined type piezoceramics drive circuit Download PDFInfo
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- CN112928945A CN112928945A CN202110129624.3A CN202110129624A CN112928945A CN 112928945 A CN112928945 A CN 112928945A CN 202110129624 A CN202110129624 A CN 202110129624A CN 112928945 A CN112928945 A CN 112928945A
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- 239000000919 ceramic Substances 0.000 claims abstract description 56
- 239000002131 composite material Substances 0.000 claims abstract description 42
- 230000003321 amplification Effects 0.000 claims abstract description 8
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- 239000003990 capacitor Substances 0.000 claims description 21
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- 238000010586 diagram Methods 0.000 description 12
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- 238000000034 method Methods 0.000 description 4
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- 238000004088 simulation Methods 0.000 description 3
- 230000009123 feedback regulation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/0075—Electrical details, e.g. drive or control circuits or methods
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/0075—Electrical details, e.g. drive or control circuits or methods
- H02N2/008—Means for controlling vibration frequency or phase, e.g. for resonance tracking
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Abstract
The invention discloses a composite piezoelectric ceramic driving circuit, which comprises a voltage signal generator, a primary following unit and a secondary amplifying unit, wherein the voltage signal generator is connected with the primary following unit; the voltage signal generator outputs a voltage signal to a primary following unit, the primary following unit outputs a first voltage signal after performing low-output offset voltage processing and low-noise processing on the voltage signal, and the secondary amplifying unit outputs a power driving signal after performing power amplification on the first voltage signal; the mode of combining the low-voltage operational amplifier with high precision and the high-voltage operational amplifier with high output power is adopted, so that the circuit has low offset voltage, low noise and high frequency bandwidth while having high power output capability, and the tracking precision of the fine tracking system is remarkably improved.
Description
Technical Field
The invention relates to the field of driving circuits, in particular to a composite piezoelectric ceramic driving circuit.
Background
At present, the Tracking accuracy is an important index for measuring Acquisition, Tracking and Pointing (ATP) systems, and the final Tracking accuracy of the composite axis ATP system is determined by a fine Tracking system. The piezoelectric ceramic driving circuit is used as an important execution component of the precise tracking system, and the indexes such as output offset voltage, output noise, frequency bandwidth and the like of the piezoelectric ceramic driving circuit have important influence on the tracking precision of the precise tracking system.
The existing piezoelectric ceramic driving circuit generally adopts a cascading driving strategy, namely a first-stage low-voltage operational amplifier is used for voltage following, and a first-stage high-voltage operational amplifier is used for power amplification, and because the high-voltage operational amplifier has the defects of large offset voltage, high output noise, low frequency bandwidth and the like, the output precision of a fine tracking system is greatly limited.
Disclosure of Invention
The invention aims to solve the technical problems of large offset voltage, high output noise, low frequency bandwidth and the like of the conventional high-voltage operational amplifier, and aims to provide a composite piezoelectric ceramic driving circuit which adopts a mode of combining a low-voltage operational amplifier with higher precision and a high-voltage operational amplifier with higher output power to obviously improve the tracking precision of a precise tracking system.
The invention is realized by the following technical scheme:
a composite piezoelectric ceramic driving circuit comprises a voltage signal generator, a primary following unit and a secondary amplifying unit; the voltage signal generator outputs a voltage signal to a primary following unit, the primary following unit outputs a first voltage signal after performing low-output offset voltage processing and low-noise processing on the voltage signal, and the secondary amplifying unit outputs a power driving signal after performing power amplification on the first voltage signal.
The mode of combining the low-voltage operational amplifier with high precision and the high-voltage operational amplifier with high output power is adopted, so that the circuit has low offset voltage, low noise and high frequency bandwidth while having high power output capability, and the tracking precision of the fine tracking system is remarkably improved.
Further, the method comprises the following steps: input resistance R1Input resistance R2Input resistance R3Input resistance R4A feedback resistor Rf1A feedback resistor Rf2A feedback resistor Rf3A feedback resistor Rf4High-precision low-voltage operational amplifier AMP1, high-power high-voltage operational amplifier AMP2 and input voltage signal generator Vin(ii) a The input voltage signal generator VinThe output signal end of the resistor is connected with an input resistor R1Said input voltage signal generator VinThe ground port of the input resistor R is grounded, and the input resistor R is connected with the ground port of the input resistor R1The other end of the high-precision low-voltage amplifier AMP1 is connected with the positive input end of the high-precision low-voltage amplifier AMP1 and the feedback resistor R at the same timef1The one end of the feedback resistor Rf1The other end of the first and second electrodes is grounded; the input resistor R2Is grounded, the input resistor R2The other end of the high-precision low-voltage amplifier AMP1 is connected with the negative input end of the high-precision low-voltage amplifier AMP1 and the feedback resistor R at the same timef2The one end of the feedback resistor Rf2The other end of the high-precision low-voltage amplifier AMP1 is connected with an input resistor R, and the output end of the high-precision low-voltage amplifier AMP2 is connected with the output port of the high-power high-voltage amplifier AMP24Said input resistance R, said input resistance R4The other end of the feedback resistor R is connected with the positive input end of a high-power high-voltage amplifier AMP2, and the feedback resistor Rf4One end of the feedback resistor R is connected with the positive input end of the high-power high-voltage amplifier AMP2f4The other end of the first and second electrodes is grounded; the input resistor R3Is grounded, the input resistor R3The other end of the high-power high-voltage amplifier AMP2 is connected with the negative input end of the high-power high-voltage amplifier AMP2, and the feedback resistor Rf3One end of the feedback resistor R is connected with the negative input end of the high-power high-voltage amplifier AMP2f3The other end of the high-power high-voltage amplifier is connected with an output port of an AMP 2;
the feedback circuit further comprises a filter capacitor C1 and a filter capacitor C2, wherein the filter capacitor C1 is connected in parallel with the feedback resistor Rf2The filter capacitor C2 is connected with a feedback resistor R in parallelf3。
Further, an output port of the high-power high-voltage amplifier AMP2 outputs an offset voltage, where the output offset voltage is expressed as
Wherein v isos_outIndicating the output offset voltage, v, of a composite piezoelectric ceramic drive circuitos1Indicating high precision low pressure operationInput offset voltage, I, of amplifier AMP1os_max1Indicating the input offset current of the high precision low voltage operational amplifier AMP 1.
Further, the high-precision low-voltage amplifier AMP1 is in the model of OPA 2189.
Further, the high-power high-voltage amplifier AMP2 is in a model of PA 93.
Further, the input resistor R1＝R2＝R3＝R4。
Further, the feedback resistor Rf1＝Rf2＝Rf3＝Rf。
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to a composite piezoelectric ceramic driving circuit which outputs in a mode of combining a high-precision low-voltage operational amplifier and a high-power high-voltage operational amplifier. The output precision of the driving circuit is ensured by utilizing the excellent low-output offset voltage and low-noise characteristics of the high-precision low-voltage operational amplifier; the power amplification characteristic of the high-power high-voltage operational amplifier is utilized to realize the output of the power driving signal. Through the control engineering correlation theory, the frequency characteristic of the composite piezoelectric ceramic driving circuit is analyzed, and compared with the traditional cascade piezoelectric ceramic driving circuit, the-3 dB bandwidth is remarkably improved. By adding the filter capacitor, the peaking phenomenon in the frequency response curve of the composite driving circuit is relieved, and meanwhile, the-3 dB bandwidth of the composite driving circuit is still better than that of the cascade piezoelectric ceramic driving circuit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a circuit diagram of a cascaded piezoelectric ceramic driving circuit;
FIG. 2 is a circuit diagram of a composite piezoelectric ceramic driving circuit;
FIG. 3 is a graph of output offset voltage simulation results;
FIG. 4 is a circuit diagram of a piezoelectric ceramic driving circuit considering input noise;
FIG. 5 is a block diagram of the transfer function of the composite piezoelectric ceramic driving circuit;
FIG. 6 is a bode diagram of a compound filter capacitance-unaccounted piezoelectric ceramic driving circuit;
FIG. 7 is a block diagram of the transfer function of the composite piezoelectric ceramic driving circuit with filter capacitors taken into account;
FIG. 8 is a diagram illustrating the effect of filter capacitors on the frequency response curve of a composite piezoelectric ceramic driving circuit;
FIG. 9 is a waveform diagram of unit step response of the composite and cascaded piezoceramic driving circuits.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Examples
Fig. 2 shows a composite piezoelectric ceramic driving circuit according to the present invention. The method comprises the following steps: 1) high-precision low-voltage operational amplifier (AMP1), 2) high-power high-voltage operational amplifier (AMP2), 3) input resistor R1, 4) input resistor R2, 5) feedback resistor Rf1, 6) feedback resistor Rf2, 7) filter capacitor C1, 8) filter capacitor C2.
The circuit of FIG. 1, without taking into account the filter capacitor C1And C2The influence of (c). Because the composite piezoelectric ceramic driving circuit has the capability of input and output feedback regulation, the output offset voltage of the composite piezoelectric ceramic driving circuit only depends on the output offset voltage of the high-precision low-voltage operational amplifier. According to the theory related to the circuit, an expression of the output offset voltage of the composite piezoelectric ceramic driving circuit can be obtained, as shown in formula (1):
wherein v isos_outOutput offset voltage v representing composite piezoelectric ceramic driving circuitos1Input offset voltage, I, representing high precision low voltage operational amplifier AMP1os_max1Indicating the input offset current of the high precision low voltage operational amplifier AMP 1. In the invention, OPA2189 is selected as high-precision low-voltage operational amplifier AMP1, and PA93 is selected as high-power high-voltage operational amplifier AMP 2. In order to achieve a 10-fold amplified output,input resistance R1、R2The values of (A) are as follows: r1＝R21k Ω, feedback resistance Rf1、Rf2The values of (A) are as follows: rf1＝Rf210k Ω. A circuit simulation model is established, output offset voltage of the combined piezoelectric ceramic driving circuit and output offset voltage of the cascaded piezoelectric ceramic driving circuit under the condition of zero voltage input are compared, and a simulation result is shown in fig. 3. By adopting a cascade piezoelectric ceramic driving circuit, the output offset voltage of the system is 110.05mV, and the main factors influencing the output offset voltage are derived from the input offset voltage v of a high-power high-voltage operational amplifier AMP2(PA93)os2(ii) a By adopting the composite piezoelectric ceramic driving circuit, the output offset voltage of the system is only 30.4 muV, and the main factor influencing the output offset voltage is derived from the input offset current I of the high-precision low-voltage operational amplifier AMP1(OPA2189)os_max1And a feedback resistor Rf1The value of (a). Obviously, compared with the cascade type piezoelectric ceramic driving circuit, the composite piezoelectric ceramic driving circuit has smaller output offset voltage.
Fig. 4 shows an equivalent model of a compound piezoelectric ceramic driving circuit in consideration of input noise of an amplifier. Wherein v isnoise1Input noise, v, for high precision low voltage operational amplifier AMP1(OPA2189)noise2Is the input noise of a high-power high-voltage operational amplifier AMP2(PA 93). The circuit of FIG. 4, without taking filter capacitor C into account1And C2The influence of (c). Because the composite piezoelectric ceramic driving circuit has the capability of input and output feedback regulation, the output noise of the composite piezoelectric ceramic driving circuit only depends on the output noise of the high-precision low-voltage operational amplifier. According to the theory related to the circuit, an expression of the output noise of the composite piezoelectric ceramic driving circuit can be obtained, as shown in formula (2):
vout_noise＝vnoise1 (2)
compared with a cascade type piezoelectric ceramic driving circuit (the output noise expression is shown as a formula (3)), the composite piezoelectric ceramic driving circuit has more excellent low-noise output characteristic.
The circuit shown in FIG. 1, the filter capacitor C is not considered for the moment1And C2The influence of (c). According to the control engineering correlation theory, a transfer function block diagram of the composite piezoelectric ceramic driving circuit is obtained, as shown in fig. 5. Wherein A isv1Represents the open-loop amplification gain, ω, of the high-precision low-voltage operational amplifier AMP1(OPA2189)B1Represents the open loop transition frequency, A, of a high precision low voltage operational amplifier AMP1(OPA2189)v2Represents the open-loop amplification gain, ω, of a high-power, high-voltage operational amplifier, AMP2(PA93)B2Indicating the open loop transition frequency of the high power high voltage operational amplifier AMP2(PA 93). The bode diagram of the combined piezoelectric ceramic driving circuit and the cascade piezoelectric ceramic driving circuit is compared by Simulink simulation software, as shown in fig. 6. Although the-3 dB bandwidth of the driving circuit can be increased to 4.16MHz from 560kHz (cascade drive) by adopting the compound drive, the peaking is brought to the system, and the peaking degree of the system is along with the feedback resistance Rf2And an input resistor R2The increase of the ratio is aggravated, so that the damping coefficient of the system is reduced and the stability is reduced. To mitigate the system peaking, the feedback resistance R may be reducedf2And an input resistor R2A ratio. The feedback resistor R is due to the limitation of the rail-to-rail output voltage of the high precision low voltage operational amplifier AMP1(OPA2189)f2And an input resistor R2The ratio should not be less than 5.55. As shown in fig. 6, when the feedback resistor R is usedf2And an input resistor R2At a ratio equal to 6, the degree of peaking of the system is still very significant.
In order to eliminate peaking in the bode diagram of the composite driving amplification circuit, a filter capacitor needs to be connected in parallel to a feedback resistor, as shown in fig. 2. Wherein, the filter capacitor C1And a feedback resistor Rf1Parallel connection, filter capacitor C2And a feedback resistor Rf2And (4) connecting in parallel. According to the control engineering correlation theory, the filter capacitor C is considered1And C2The transfer function diagram of the composite piezoelectric ceramic driving circuit is shown in fig. 7. The influence of the filter capacitor on the frequency response curve of the composite piezoelectric ceramic driving circuit is compared through Simulink simulation software, as shown in FIG. 8. With addition of filter capacitanceIn addition, the system peaking degree is well suppressed, but the system frequency bandwidth is reduced. Nevertheless, through the configuration to the filter capacitance, still can guarantee that the-3 dB bandwidth of system is greater than 1MHz, compares with cascade type piezoceramics drive circuit, and its frequency bandwidth has still obtained great promotion.
As can be seen from fig. 3, compared with the cascaded piezoelectric ceramic driving circuit, the output offset voltage of the composite piezoelectric ceramic driving circuit proposed by this patent is only 30.4 μ V. Through the formulas (2) and (3), the composite piezoelectric ceramic driving circuit provided by the patent has lower output noise compared with a cascade piezoelectric ceramic driving circuit. As can be seen from fig. 8, compared with the cascaded piezoelectric ceramic driving circuit, the composite piezoelectric ceramic driving circuit provided by the present invention can ensure that the-3 dB bandwidth of the system is greater than 1 MHz. As can be seen from fig. 9, compared with the cascaded piezoelectric ceramic driving circuit, the composite piezoelectric ceramic driving circuit proposed by the present patent has a faster step response speed, and there is no overshoot and oscillation in the whole response process. In summary, it can be considered that: the combined type piezoelectric ceramic driving circuit provided by the patent can realize smaller output offset voltage, lower output noise and larger frequency bandwidth, and ensures that a fine tracking system has better tracking precision.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A composite piezoelectric ceramic driving circuit is characterized by comprising a voltage signal generator, a primary following unit and a secondary amplifying unit; the voltage signal generator outputs a voltage signal to a primary following unit, the primary following unit outputs a first voltage signal after performing low-output offset voltage processing and low-noise processing on the voltage signal, and the secondary amplifying unit outputs a power driving signal after performing power amplification on the first voltage signal.
2. The composite piezoceramic driving circuit according to claim 1, comprising: input resistance R1Input resistance R2Input resistance R3Input resistance R4A feedback resistor Rf1A feedback resistor Rf2A feedback resistor Rf3A feedback resistor Rf4High-precision low-voltage operational amplifier AMP1, high-power high-voltage operational amplifier AMP2 and input voltage signal generator Vin(ii) a The input voltage signal generator VinThe output signal end of the resistor is connected with an input resistor R1Said input voltage signal generator VinThe ground port of the input resistor R is grounded, and the input resistor R is connected with the ground port of the input resistor R1The other end of the high-precision low-voltage amplifier AMP1 is connected with the positive input end of the high-precision low-voltage amplifier AMP1 and the feedback resistor R at the same timef1The one end of the feedback resistor Rf1The other end of the first and second electrodes is grounded; the input resistor R2Is grounded, the input resistor R2The other end of the high-precision low-voltage amplifier AMP1 is connected with the negative input end of the high-precision low-voltage amplifier AMP1 and the feedback resistor R at the same timef2The one end of the feedback resistor Rf2The other end of the high-precision low-voltage amplifier AMP1 is connected with an input resistor R, and the output end of the high-precision low-voltage amplifier AMP2 is connected with the output port of the high-power high-voltage amplifier AMP24Said input resistance R, said input resistance R4The other end of the feedback resistor R is connected with the positive input end of a high-power high-voltage amplifier AMP2, and the feedback resistor Rf4One end of the feedback resistor R is connected with the positive input end of the high-power high-voltage amplifier AMP2f4The other end of the first and second electrodes is grounded; the input resistor R3Is grounded, the input resistor R3The other end of the high-power high-voltage amplifier AMP2 is connected with the negative input end of the high-power high-voltage amplifier AMP2, and the feedback resistor Rf3One end of the feedback resistor R is connected with the negative input end of the high-power high-voltage amplifier AMP2f3The other end of the high-power high-voltage amplifier is connected with an output port of an AMP 2;
wherein, the filter also comprises a filter capacitor C1 and a filter capacitor C2, the filterThe wave capacitor C1 is connected in parallel with the feedback resistor Rf2The filter capacitor C2 is connected with a feedback resistor R in parallelf3。
3. The composite piezoelectric ceramic driving circuit as claimed in claim 1, wherein the output port of the high power and high voltage amplifier AMP2 outputs an offset voltage, and the output offset voltage is expressed as
Wherein v isos_outIndicating the output offset voltage, v, of a composite piezoelectric ceramic drive circuitos1Input offset voltage, I, representing high precision low voltage operational amplifier AMP1os_max1Indicating the input offset current of the high precision low voltage operational amplifier AMP 1.
4. The composite piezoelectric ceramic driving circuit as claimed in claim 1, wherein the high precision low voltage amplifier AMP1 is of type OPA 2189.
5. The composite piezoceramic driving circuit according to claim 1, wherein the high-power high-voltage amplifier AMP2 is of type PA 93.
6. The composite piezo-ceramic driving circuit as claimed in claim 1, wherein said input resistor R1＝R2＝R3＝R4。
7. The composite piezo-ceramic driving circuit as claimed in claim 1, wherein the feedback resistor Rf1＝Rf2＝Rf3＝Rf。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039084A (en) * | 2007-04-20 | 2007-09-19 | 哈尔滨工程大学 | Wide-band piezoelectric ceramics driving power source |
| CN202334446U (en) * | 2011-12-01 | 2012-07-11 | 江西省电力科学研究院 | Bipolar high-voltage power amplifier |
| CN105048864A (en) * | 2015-08-24 | 2015-11-11 | 哈尔滨工业大学 | Novel error-amplification-type piezoelectric ceramic driving circuit |
| CN107070298A (en) * | 2017-03-13 | 2017-08-18 | 中国科学院自动化研究所 | Piezoelectric Ceramic control system |
| CN110098763A (en) * | 2019-05-10 | 2019-08-06 | 天津科技大学 | A kind of supersonic guide-wave drive power supply for piezoelectric ceramics based on FPGA |
-
2021
- 2021-01-29 CN CN202110129624.3A patent/CN112928945A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039084A (en) * | 2007-04-20 | 2007-09-19 | 哈尔滨工程大学 | Wide-band piezoelectric ceramics driving power source |
| CN202334446U (en) * | 2011-12-01 | 2012-07-11 | 江西省电力科学研究院 | Bipolar high-voltage power amplifier |
| CN105048864A (en) * | 2015-08-24 | 2015-11-11 | 哈尔滨工业大学 | Novel error-amplification-type piezoelectric ceramic driving circuit |
| CN107070298A (en) * | 2017-03-13 | 2017-08-18 | 中国科学院自动化研究所 | Piezoelectric Ceramic control system |
| CN110098763A (en) * | 2019-05-10 | 2019-08-06 | 天津科技大学 | A kind of supersonic guide-wave drive power supply for piezoelectric ceramics based on FPGA |
Non-Patent Citations (1)
| Title |
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