CN217904374U - Drive control circuit of piezoelectric actuator and device adopting same - Google Patents
Drive control circuit of piezoelectric actuator and device adopting same Download PDFInfo
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- CN217904374U CN217904374U CN202222021867.8U CN202222021867U CN217904374U CN 217904374 U CN217904374 U CN 217904374U CN 202222021867 U CN202222021867 U CN 202222021867U CN 217904374 U CN217904374 U CN 217904374U
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Abstract
The utility model discloses a drive control circuit of piezoelectric actuator and adopt device of this circuit. The drive control circuit of the piezoelectric actuator comprises an error amplification unit and a power amplification unit, wherein the error amplification unit comprises a first resistor R1, a second resistor R2 and a first operational amplifier U1, and the power amplification unit comprises a third resistor R3, a fourth resistor R4, a second operational amplifier U2, a first triode Q1 and a second triode Q2. The utility model provides a technical scheme can solve among the correlation technique drive arrangement of piezoelectric actuator and adopt integrated power to enlarge the chip, leads to the too high and limited technical problem of drive current of circuit cost.
Description
Technical Field
The utility model relates to a little actuating technique field especially relates to a piezoelectric actuator's drive control circuit and adopt device of this circuit.
Background
In the field of micro-actuation, the piezoelectric actuator has the advantages of high positioning precision, simple structure, strong electromagnetic interference resistance and the like; in recent years, the method has been widely used in various industrial fields.
The performance of the piezoelectric actuator is not only related to the piezoelectric ceramics and the structure of the piezoelectric actuator, but also has close relation with a drive control hardware circuit. The driving circuit of the piezoelectric actuator has various forms, and is mainly divided into two types: a voltage-driven type and a current-driven type. The voltage-driven driving power supply mainly has two types, i.e., a switching type and a dc amplification type. The dc amplification type driving circuit is a mainstream type of the current driving power supply. The main part of the direct current amplifier is a linear operational amplifier, which amplifies the voltage and current of the control signal to drive the piezoelectric actuator.
The existing direct current amplification type driving circuit mostly adopts an integrated power amplification chip to amplify voltage and current, but the price of the chip is expensive, so that the cost of the whole circuit is high. Moreover, the chip has limited output driving current and is not enough to drive the high-frequency action of the piezoelectric ceramics with large capacitance value.
Therefore, it is necessary to design a new driving control circuit for a piezoelectric actuator and a device using the same to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The main objective of the present invention is to provide a driving control circuit for piezoelectric actuator, which aims to solve the problem of the related art that the driving circuit adopts an integrated power amplifier chip, resulting in the technical problem of too high circuit cost and limited driving current.
The utility model provides a drive control circuit of piezoelectric actuator, including error amplification unit and power amplification unit, the error amplification unit includes first resistance R1, second resistance R2 and first operational amplifier U1, the power amplification unit includes third resistance R3, fourth resistance R4, second operational amplifier U2, first triode Q1 and second triode Q2;
a first end of the first resistor R1 is connected with a first end of the second resistor R2 and a first end of the first operational amplifier U1, a second end of the first resistor R1 is grounded, and a second end of the first operational amplifier U1 is connected with a circuit input end;
a first end of the third resistor R3 is connected to a first end of the fourth resistor R4 and a first end of the second operational amplifier U2, a second end of the third resistor R3 is grounded, a second end of the second operational amplifier U2 is connected to a third end of the first operational amplifier U1, a third end of the second operational amplifier U2 is connected to a first end of the first triode Q1 and a first end of the second triode Q2, and a second end of the first triode Q1, a second end of the second triode Q2, a second end of the fourth resistor R4, and a second end of the second resistor R2 are connected to a circuit output end;
the resistance value ratio of the first resistor R1 to the second resistor R2 is 1.
The utility model also provides a drive control device of the piezoelectric actuator, which comprises a power supply module, a control module and the drive control circuit; the power supply module is used for supplying power to the control module and the drive control circuit, and the control module is used for sending a control instruction to the drive circuit.
Preferably, the drive control device of the piezoelectric actuator further comprises a communication module, and the communication module is used for establishing a communication channel between the control module and an upper computer.
The utility model provides an among piezoelectric actuator's drive control circuit and the device that adopts this circuit, this drive controller's drive circuit uses discrete component (general operational amplifier and triode) to replace the power amplification chip, reduces circuit cost.
The circuit compensation and the capacity of the circuit for driving the capacitive load are increased in the general operational amplifier circuit. The triode is used for amplifying current, so that the value of the drive current which can be output is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a circuit diagram of a driving control circuit of a piezoelectric actuator according to the present invention;
fig. 2 is an architecture diagram of a drive control device of a piezoelectric actuator according to the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
The utility model provides a drive control circuit of piezoelectric actuator.
Referring to fig. 1, in an embodiment of the present invention, a driving control circuit of a piezoelectric actuator includes an error amplifying unit and a power amplifying unit, where the error amplifying unit includes a first resistor R1, a second resistor R2 and a first operational amplifier U1, and the power amplifying unit includes a third resistor R3, a fourth resistor R4, a second operational amplifier U2, a first triode Q1 and a second triode Q2;
a first end of the first resistor R1 is connected with a first end of the second resistor R2 and a first end of the first operational amplifier U1, a second end of the first resistor R1 is grounded, and a second end of the first operational amplifier U1 is connected with a circuit input end;
a first end of the third resistor R3 is connected to a first end of the fourth resistor R4 and a first end of the second operational amplifier U2, a second end of the third resistor R3 is grounded, a second end of the second operational amplifier U2 is connected to a third end of the first operational amplifier U1, a third end of the second operational amplifier U2 is connected to a first end of the first triode Q1 and a first end of the second triode Q2, and a second end of the first triode Q1, a second end of the second triode Q2, a second end of the fourth resistor R4, and a second end of the second resistor R2 are connected to a circuit output end;
the resistance value ratio of the first resistor R1 to the second resistor R2 is 1.
The utility model provides a piezoelectric actuator's drive control circuit, this drive circuit use discrete component (general operational amplifier and triode) to replace the power amplification chip, reduce circuit cost.
The circuit compensation and the capacity of driving capacitive load by the circuit are increased in the general operational amplifier circuit. The triode is used for amplifying current, so that the value of the drive current which can be output is greatly improved.
The utility model provides a piezoelectric actuator's drive control circuit's theory of operation as follows:
the amplification factor of the whole drive control circuit is 48 times, and the maximum drive voltage of 120V can be provided. The integral amplification factor of the drive control circuit is larger. In order to increase the system bandwidth and reduce the input offset voltage, a circuit form of a two-stage amplification unit is adopted.
Two-stage composite amplification unit circuit principle:
the two-stage composite amplifying circuit is divided into an error amplifying unit and a power amplifying unit. All adopt a voltage amplification form with reverse proportion.
The error amplification unit takes a high-precision integrated first operational amplifier U1 with low input offset voltage as a main component, amplifies the voltage error of the whole driving circuit, and uses a resistor (R1: R2) with high precision and a ratio of 1. In addition, a potentiometer may be externally connected to the first operational amplifier U1 to adjust the input offset voltage to further reduce the input offset voltage.
The power amplification unit takes a high-voltage second operational amplifier U2 as a main component. On one hand, the voltage is amplified together with the error amplification unit, and on the other hand, the output current of the second operational amplifier U2 is amplified by using the triode, so that the output current of the drive control circuit is improved.
The output of the second operational amplifier U2 is fed back to the inverting input end of the first operational amplifier U1, and the input offset voltage of the whole circuit is determined by the first operational amplifier U1.
The utility model also provides a piezoelectric actuator's drive control device.
Referring to fig. 2, in an embodiment of the present invention, the driving control device of the piezoelectric actuator includes a power supply module, a control module and the driving control circuit; the power supply module is used for supplying power to the control module and the drive control circuit, and the control module is used for sending a control instruction to the drive circuit.
The control module can adopt an ARM microcontroller to realize a control algorithm required by controlling the piezoelectric actuator. The control module part mainly comprises an MCU chip and a peripheral circuit thereof.
The MCU chip is a core part for completing a control algorithm, and meanwhile, the MCU chip internally comprises a DA converter for converting a control signal into an analog quantity and outputting the analog quantity to the drive control circuit.
The piezoelectric actuator can be controlled by using functions such as a timer and a DMA (direct memory access) inside the MCU to output waveforms with any frequency and shape.
The power supply module comprises a switching power supply and an on-board power supply, and the input of the switching power supply and the on-board power supply is mains voltage.
The switching power supply provides a +130V high-voltage direct-current power supply for the power amplification unit. The board-mounted power supply is welded on the driving circuit board, and converts the 220VAC mains supply into the direct current of +/-15V. The +15VDC part is output to the LDO with +3.3V output (the LDO pre-regulator tube reduces the +15V power supply to the suitable input voltage of the LDO) on the one hand, and a positive power supply is provided for the first operational amplifier U1 of the error amplification unit of the driving circuit on the other hand. The-15 VDC portion provides negative power to the entire drive circuit.
In a preferred aspect of the present embodiment, the drive control device for a piezoelectric actuator further includes a communication module, and the communication module is configured to establish a communication channel between the control module and an upper computer.
In order to integrate with the existing industrial equipment and improve the applicability, the control module needs to communicate with the upper computer, in order to improve the communication speed and the communication quality, the communication module adopts Ethernet port communication, and the upper computer can generate a control instruction to the control system and can feed back a feedback signal of the control system to the upper computer.
The communication module Ethernet chip (DM 9000 AEP) is directly connected with the control module through the FSMC functional pin of the MCU, so that the MCU can access the register of the Ethernet chip. The communication module is connected with the outside through an RJ45 crystal head.
The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (3)
1. The drive control circuit of the piezoelectric actuator is characterized by comprising an error amplification unit and a power amplification unit, wherein the error amplification unit comprises a first resistor R1, a second resistor R2 and a first operational amplifier U1, and the power amplification unit comprises a third resistor R3, a fourth resistor R4, a second operational amplifier U2, a first triode Q1 and a second triode Q2;
a first end of the first resistor R1 is connected with a first end of the second resistor R2 and a first end of the first operational amplifier U1, a second end of the first resistor R1 is grounded, and a second end of the first operational amplifier U1 is connected with a circuit input end;
a first end of the third resistor R3 is connected to a first end of the fourth resistor R4 and a first end of the second operational amplifier U2, a second end of the third resistor R3 is grounded, a second end of the second operational amplifier U2 is connected to a third end of the first operational amplifier U1, a third end of the second operational amplifier U2 is connected to a first end of the first triode Q1 and a first end of the second triode Q2, and a second end of the first triode Q1, a second end of the second triode Q2, a second end of the fourth resistor R4, and a second end of the second resistor R2 are connected to a circuit output end;
the resistance ratio of the first resistor R1 to the second resistor R2 is 1.
2. A drive control device of a piezoelectric actuator, comprising a power supply module, a control module, and the drive control circuit of claim 1; the power supply module is used for supplying power to the control module and the drive control circuit, and the control module is used for sending a control instruction to the drive circuit.
3. The drive control device of a piezoelectric actuator according to claim 2, further comprising a communication module for establishing a communication channel between the control module and an upper computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222021867.8U CN217904374U (en) | 2022-08-02 | 2022-08-02 | Drive control circuit of piezoelectric actuator and device adopting same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222021867.8U CN217904374U (en) | 2022-08-02 | 2022-08-02 | Drive control circuit of piezoelectric actuator and device adopting same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217904374U true CN217904374U (en) | 2022-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222021867.8U Active CN217904374U (en) | 2022-08-02 | 2022-08-02 | Drive control circuit of piezoelectric actuator and device adopting same |
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| Country | Link |
|---|---|
| CN (1) | CN217904374U (en) |
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2022
- 2022-08-02 CN CN202222021867.8U patent/CN217904374U/en active Active
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